阅读说明：本技术 一种牵引变流器的控制装置及方法 (Control device and method for traction converter ) 是由 尚敬 徐绍龙 黄浩 付刚 甘韦韦 章志兵 邹档兵 陈锦宇 林珍君 邹东海 薛新 于 2020-07-30 设计创作，主要内容包括：本申请公开了一种牵引变流器的控制装置,包括电压检测电路与传动控制单元；所述电压检测电路,用于检测电网电压,并输出电压信号；所述传动控制单元,用于根据所述电压信号确定线路的供电制式,根据所述电压信号计算得到所述电网电压,并根据所述供电制式以及所述电网电压控制牵引变流器的主电路的运行模式。该控制装置能够自动检测供电制式并控制牵引变流器的主电路的运行模式,避免人为操作失误的风险,提高轨道车辆运行安全性。本申请还公开了一种牵引变流器的控制方法,同样具有上述技术效果。(The application discloses a control device of a traction converter, which comprises a voltage detection circuit and a transmission control unit; the voltage detection circuit is used for detecting the voltage of the power grid and outputting a voltage signal; and the transmission control unit is used for determining a power supply system of a line according to the voltage signal, calculating the power grid voltage according to the voltage signal, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage. The control device can automatically detect the power supply system and control the operation mode of the main circuit of the traction converter, avoid the risk of human misoperation and improve the operation safety of the railway vehicle. The application also discloses a control method of the traction converter, and the control method also has the technical effects.)

1. A control device for a traction converter, comprising:

a voltage detection circuit and a transmission control unit;

the voltage detection circuit is used for detecting the voltage of the power grid and outputting a voltage signal;

and the transmission control unit is used for determining a power supply system of a line according to the voltage signal, calculating the power grid voltage according to the voltage signal, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

2. The control device according to claim 1, wherein the voltage detection circuit includes:

a first voltage detection circuit and a second voltage detection circuit;

the first voltage detection circuit comprises a transformer and is used for carrying out voltage reduction processing on the power grid voltage through the transformer and outputting a first voltage signal after voltage reduction processing;

the second voltage detection circuit comprises a voltage sensor and is used for collecting the power grid voltage through the voltage sensor and outputting a second voltage signal.

3. The control device of claim 2, wherein the transformer comprises a first transformer and a second transformer; the primary coil of the first transformer is connected with the pantograph, the secondary coil of the first transformer is connected with the primary coil of the second transformer, and the secondary coil of the second transformer is connected with the transmission control unit.

4. The control device of claim 3, wherein the second voltage detection circuit further comprises a current limiting resistor and a filter capacitor; the current limiting resistor is connected with a primary coil of the first transformer in series, and the voltage sensor is connected with the current limiting resistor in parallel; the filter capacitor is connected with the current limiting resistor in parallel.

5. The control device according to claim 4, wherein the transmission control unit includes:

the alternating current and direct current network voltage sampling module is used for converting the voltage signal into a voltage signal which is allowed to be input by the digital signal processing module;

the digital signal processing module is used for determining a power supply system of a line according to a voltage signal output by the AC/DC network voltage sampling module, calculating to obtain the power grid voltage according to the voltage signal output by the AC/DC network voltage sampling module, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage;

and the communication processing module is used for carrying out data interaction with the display of the driver control room.

6. The control device according to claim 5, characterized in that the transmission control unit is specifically configured to:

if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system;

if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system;

if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area;

and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

7. The control device according to claim 6, characterized in that the transmission control unit is specifically configured to:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer, the transformation ratio of the second transformer, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer, the resistance value of the current limiting resistor and the capacitance value of the filter capacitor; the alternating current and direct current voltage detection link comprises the voltage detection circuit and the alternating current and direct current voltage sampling module;

calculating to obtain the power grid voltage under an alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit according to the resistance value of the current limiting resistor and the winding resistance of the primary coil of the first transformer;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit and the second voltage signal.

8. Control device according to claim 7, characterized in that the transmission control device is particularly adapted to:

if the power supply system of the circuit is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode;

if the power supply system of the circuit is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current operation mode;

if the rail vehicle is in the non-electric area, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode;

and if the rail vehicle is in an abnormal working condition, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode.

9. The control device of claim 8, wherein the transmission control unit is further configured to send a power supply system of the line and an operation mode of the main circuit of the traction converter to a cab display.

10. A method of controlling a traction converter, comprising:

receiving a voltage signal output by a voltage detection circuit;

determining a power supply system of the line according to the voltage signal;

calculating to obtain the power grid voltage according to the voltage signal;

and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

11. The control method according to claim 10, wherein the receiving the voltage signal output by the voltage detection circuit includes:

receiving a first voltage signal output by a first voltage detection circuit and a second voltage signal output by a second voltage detection circuit;

the first voltage detection circuit comprises a transformer, and the first voltage detection circuit performs voltage reduction processing on the power grid voltage through the transformer and outputs a first voltage signal after voltage reduction processing; the second voltage detection circuit comprises a voltage sensor, and the second voltage detection circuit collects the power grid voltage through the voltage sensor and outputs the second voltage signal.

12. The control method according to claim 11, wherein the determining a power supply system of the line according to the voltage signal includes:

if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system;

if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system;

if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area;

and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

13. The control method of claim 12, wherein calculating the grid voltage from the voltage signal comprises:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer, the transformation ratio of the second transformer, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer, the resistance value of the current limiting resistor and the capacitance value of the filter capacitor; the alternating current and direct current voltage detection link comprises the voltage detection circuit and the alternating current and direct current voltage sampling module;

calculating to obtain the power grid voltage under an alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit according to the resistance value of the current limiting resistor and the winding resistance of the primary coil of the first transformer;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit and the second voltage signal.

14. The control method according to claim 13, wherein the controlling the operation mode of the main circuit of the traction converter according to the power supply system and the grid voltage comprises:

if the power supply system of the circuit is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode;

if the power supply system of the circuit is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current operation mode;

if the rail vehicle is in the non-electric area, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode;

and if the rail vehicle is in an abnormal working condition, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode.

15. The control method according to claim 14, characterized by further comprising:

and sending the power supply system of the line and the operation mode of the main circuit of the traction converter to a driver control room display.

Technical Field

The application relates to the technical field of railway vehicles, in particular to a control device of a traction converter; also relates to a control method of the traction converter.

Background

Due to the difference of line power supply systems, the rail vehicle needs to alternately operate between alternating current (such as AC25kV/50Hz, AC15kV/16.7Hz and the like) or direct current (such as DC3000V, DC1500V, DC750V and the like) power supply systems. Different power supply systems, the traction system of the rail vehicle needs to be in a circuit working mode matched with the power supply systems. If the working mode of the main circuit of the traction system is not matched with the power supply system, the circuit of the traction system is burnt, and the running safety of the vehicle is damaged. The key to the safe and reliable operation of the rail vehicle is to detect the power supply system of the line and to perform targeted control on the rail vehicle. However, in the current control scheme for the traction transformer, a driver selects an operation mode of the rail vehicle according to an external power supply instruction, and then a network control system closes a corresponding circuit breaker according to a power supply system instruction of the driver. The scheme relies on external information transmission and manual operation of a driver to a large extent, and the risk of manual misoperation exists, so that potential safety hazards are brought to the running of the rail vehicle.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a scheme capable of automatically detecting a power supply system and controlling an operation mode of a main circuit of a traction converter.

Disclosure of Invention

The purpose of the application is to provide a control device of a traction converter, which can automatically detect a power supply system and control the operation mode of a main circuit of the traction converter, and improve the operation safety of a railway vehicle. Another object of the present application is to provide a control method of a traction converter, which also has the above technical effects.

In order to solve the above technical problem, the present application provides a control apparatus for a traction converter, including:

a voltage detection circuit and a transmission control unit;

the voltage detection circuit is used for detecting the voltage of the power grid and outputting a voltage signal;

and the transmission control unit is used for determining a power supply system of a line according to the voltage signal, calculating the power grid voltage according to the voltage signal, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

Optionally, the voltage detection circuit includes:

a first voltage detection circuit and a second voltage detection circuit;

the first voltage detection circuit comprises a transformer and is used for carrying out voltage reduction processing on the power grid voltage through the transformer and outputting a first voltage signal after voltage reduction processing;

the second voltage detection circuit comprises a voltage sensor and is used for collecting the power grid voltage through the voltage sensor and outputting a second voltage signal.

Optionally, the transformer includes a first transformer and a second transformer; the primary coil of the first transformer is connected with the pantograph, the secondary coil of the first transformer is connected with the primary coil of the second transformer, and the secondary coil of the second transformer is connected with the transmission control unit.

Optionally, the second voltage detection circuit further includes a current-limiting resistor and a filter capacitor; the current limiting resistor is connected with a primary coil of the first transformer in series, and the voltage sensor is connected with the current limiting resistor in parallel; the filter capacitor is connected with the current limiting resistor in parallel.

Optionally, the transmission control unit includes:

the alternating current and direct current network voltage sampling module is used for converting the voltage signal into a voltage signal which is allowed to be input by the digital signal processing module;

the digital signal processing module is used for determining a power supply system of a line according to a voltage signal output by the AC/DC network voltage sampling module, calculating to obtain the power grid voltage according to the voltage signal output by the AC/DC network voltage sampling module, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage;

and the communication processing module is used for carrying out data interaction with the display of the driver control room.

Optionally, the transmission control unit is specifically configured to:

if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system;

if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system;

if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area;

and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

Optionally, the transmission control unit is specifically configured to:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer, the transformation ratio of the second transformer, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer, the resistance value of the current limiting resistor and the capacitance value of the filter capacitor; the alternating current and direct current voltage detection link comprises the voltage detection circuit and the alternating current and direct current voltage sampling module;

calculating to obtain the power grid voltage under an alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit according to the resistance value of the current limiting resistor and the winding resistance of the primary coil of the first transformer;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit and the second voltage signal.

Optionally, the transmission control device is specifically configured to:

if the power supply system of the circuit is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode;

if the power supply system of the circuit is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current operation mode;

if the rail vehicle is in the non-electric area, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode;

and if the rail vehicle is in an abnormal working condition, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode.

Optionally, the transmission control unit is further configured to send a power supply system of the line and an operation mode of a main circuit of the traction converter to a driver control room display.

In order to solve the above technical problem, the present application further provides a control method of a traction converter, including:

receiving a voltage signal output by a voltage detection circuit;

determining a power supply system of the line according to the voltage signal;

calculating to obtain the power grid voltage according to the voltage signal;

and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

Optionally, the receiving the voltage signal output by the voltage detection circuit includes:

receiving a first voltage signal output by a first voltage detection circuit and a second voltage signal output by a second voltage detection circuit;

the first voltage detection circuit comprises a transformer, and the first voltage detection circuit performs voltage reduction processing on the power grid voltage through the transformer and outputs a first voltage signal after voltage reduction processing; the second voltage detection circuit comprises a voltage sensor, and the second voltage detection circuit collects the power grid voltage through the voltage sensor and outputs the second voltage signal.

Optionally, the determining the power supply system of the line according to the voltage signal includes:

if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system;

if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system;

if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area;

and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

Optionally, the calculating the grid voltage according to the voltage signal includes:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer, the transformation ratio of the second transformer, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer, the resistance value of the current limiting resistor and the capacitance value of the filter capacitor; the alternating current and direct current voltage detection link comprises the voltage detection circuit and the alternating current and direct current voltage sampling module;

calculating to obtain the power grid voltage under an alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit according to the resistance value of the current limiting resistor and the winding resistance of the primary coil of the first transformer;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit and the second voltage signal.

Optionally, the controlling the operation mode of the main circuit of the traction converter according to the power supply system and the grid voltage includes:

if the power supply system of the circuit is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode;

if the power supply system of the circuit is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current operation mode;

if the rail vehicle is in the non-electric area, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode;

and if the rail vehicle is in an abnormal working condition, stopping the traction converter from operating, and controlling a main circuit of the traction converter to be in an alternating current operation mode.

Optionally, the method further includes:

and sending the power supply system of the line and the operation mode of the main circuit of the traction converter to a driver control room display.

The application provides a traction converter's controlling means includes: a voltage detection circuit and a transmission control unit; the voltage detection circuit is used for detecting the voltage of the power grid and outputting a voltage signal; and the transmission control unit is used for determining a power supply system of a line according to the voltage signal, calculating the power grid voltage according to the voltage signal, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

Therefore, the control device of the traction converter provided by the application detects the voltage of the power grid through the voltage detection circuit, automatically determines the power supply system of the line and the actual voltage of the power grid through the transmission control unit according to the voltage signal detected by the voltage detection circuit, and automatically controls the main circuit of the traction converter to operate in a corresponding mode. The control device replaces the traditional manual operation mode, effectively avoids the risk of manual operation errors, and improves the running safety of the railway vehicle.

The control method of the traction converter provided by the application also has the technical effects.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of a control apparatus of a traction converter according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of another control device of the traction converter provided in the embodiment of the present application;

fig. 3 is a schematic view of an application scenario of a control apparatus of a traction converter according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a control method of a traction converter according to an embodiment of the present application.

Detailed Description

The core of the application is to provide a control device of the traction converter, which can automatically detect a power supply system and control the operation mode of a main circuit of the traction converter, and improve the operation safety of a railway vehicle. Another core of the present application is to provide a control method of a traction converter, which also has the above technical effects.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic diagram of a control apparatus of a traction converter according to an embodiment of the present application, and referring to fig. 1, the apparatus includes:

a voltage detection circuit 10 and a transmission control unit 20.

The voltage detection circuit 10 is configured to detect a voltage of a power grid and output a voltage signal. And in a particular embodiment, the voltage detection circuit 10 includes: a first voltage detection circuit and a second voltage detection circuit; the first voltage detection circuit comprises a transformer and is used for carrying out voltage reduction processing on the power grid voltage through the transformer and outputting a first voltage signal after voltage reduction processing; the second voltage detection circuit comprises a voltage sensor and is used for collecting the voltage of the power grid through the voltage sensor and outputting a second voltage signal.

Specifically, the present embodiment provides two voltage detection circuits 10, namely a first voltage detection circuit and a second voltage detection circuit. The first voltage detection circuit is provided with a transformer, and the transformer is used for carrying out voltage reduction processing on the power grid voltage and outputting a first voltage signal after voltage reduction. When the power supply system is an alternating current power supply system, the first voltage detection circuit outputs alternating current. When the supply system is a direct current supply system, the transformer does not generate electromagnetic induction, and the output of the first voltage detection circuit is zero, namely no output exists.

The second voltage detection circuit is provided with a voltage sensor, and the voltage sensor acquires the voltage of the power grid and outputs a second voltage signal. When the power supply system is a dc power supply system, the second voltage detection circuit outputs a dc sensing signal to the transmission control unit 20, so that the transmission control unit 20 determines the power supply system and calculates the actual grid voltage. When the power supply system is an ac power supply system, the second voltage detection circuit outputs an ac sensing signal for the transmission control unit 20 to calculate the frequency of the ac voltage and determine whether the input voltage signal is positive or negative. Because the voltage amplitude of the grid voltage under the alternating current power supply system and the direct current power supply system is greatly different and is at least more than 12kV, and the voltage amplitude is limited by the range and the precision of the voltage sensor and the transmission control unit 20, in order to guarantee the sampling precision of the transmission control unit 20 under the direct current power supply system, in the direct current power supply system, the transmission control unit 20 which takes the sensing signal of the voltage sensor as the signal input cannot sample the over-range value of the alternating current voltage, but can accurately calculate the frequency of the alternating current voltage and judge the positive and negative of the voltage signal.

In the embodiment, two voltage signals are collected by the first voltage detection circuit and the second voltage detection circuit, and the transmission control unit 20 analyzes the two voltage signals to judge the power supply system and the power grid voltage.

Further, referring to fig. 2, on the basis of the above embodiment, the transformer in the first voltage detection circuit may include a first transformer T1 and a second transformer T2; the primary winding of the first transformer T1 is connected to the pantograph, the secondary winding of the first transformer T1 is connected to the primary winding of the second transformer T2, and the secondary winding of the second transformer T2 is connected to the transmission control unit 20.

Specifically, the first voltage detection circuit in this embodiment includes two transformers, in which a first transformer T1 (which may be a grid voltage transformer) is used to scale the ac voltage input by the grid, so as to reduce the higher ac voltage introduced by the pantograph to a voltage range that can be received by a second transformer T2. The second transformer T2 is responsible for further performing voltage reduction processing on the ac voltage output by the first transformer T1, and reducing the ac voltage output by the first transformer T1 to a voltage range that can be received by the transmission control device. Meanwhile, the second transformer T2 serves as an intermediate structure for connecting the first transformer T1 and the transmission control unit 20, and the second transformer T2 also serves to isolate the ac voltage output from the first transformer T1 from the transmission control unit 20.

It should be understood that the above-mentioned embodiment is only an implementation manner provided by the present application, and is not limited only, and other numbers of transformers may be provided according to actual needs, for example, one or more transformers may be further added on the basis of the first transformer T1 and the second transformer T2.

Further, referring to fig. 2, on the basis of the above embodiment, the second voltage detection circuit may further include a current limiting resistor R and a filter capacitor C; the current limiting resistor R is connected in series with a primary coil of the first transformer T1, and the voltage sensor is connected in parallel with the current limiting resistor R; the filter capacitor C is connected with the current limiting resistor R in parallel.

Specifically, the current limiting resistor R is connected in series with the primary coil of the first transformer T1, i.e., in series with the equivalent impedance (X1 shown in fig. 2) of the first transformer T1. The current limiting resistor R is used for limiting the current of the high-voltage input circuit and preventing the voltage sensor from being burnt by large current. The filter capacitor C is connected with the current-limiting resistor R in parallel, so that the current-limiting and filtering effects are achieved, and the voltage sensor is prevented from being burnt due to overlarge voltage fluctuation and overlarge instantaneous input current.

The transmission control unit 20 is configured to determine a power supply system of the line according to the voltage signal output by the voltage detection circuit 10, calculate a grid voltage according to the voltage signal, and control an operation mode of a main circuit of the traction converter according to the power supply system and the grid voltage.

As shown in fig. 2, the transmission control unit 20 includes an ac/dc network voltage sampling module, which is used to convert the voltage signal into a voltage signal that is allowed to be input by the digital signal processing module; the digital signal processing module is used for determining the power supply system of the line according to the voltage signal output by the AC/DC network voltage sampling module, calculating to obtain the network voltage according to the voltage signal output by the AC/DC network voltage sampling module, and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the network voltage; and the communication processing module is used for carrying out data interaction with the driver control real display.

In addition, corresponding to the implementation of the first voltage detection circuit and the second voltage detection circuit included in the voltage detection circuit 10, the transmission control unit 20 determines the power supply system in the following manner: if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system; if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system; if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area; and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

Specifically, in the dc power supply system, the first voltage detection circuit has no output, in the ac power supply system, the first voltage detection circuit outputs ac power, and in both the dc power supply system and the ac power supply system, the second voltage detection circuit has an output. Therefore, when the frequency of the voltage signal output by the first voltage detection circuit is the same as that of the voltage signal output by the second voltage detection circuit, and the two voltage signals are changed alternately in positive and negative, the power supply system of the circuit is determined to be an alternating current power supply system. When the first voltage circuit has no output and the output of the second voltage detection circuit is always larger than zero, the power supply system of the circuit is determined to be a direct current power supply system. When the first voltage detection circuit and the second voltage detection circuit do not output, it is determined that the rail vehicle is in the non-electricity area. When the first voltage detection circuit outputs voltage and the outputs of the first voltage detection circuit and the second voltage detection circuit are inconsistent (including the first voltage detection circuit outputting alternating current and the second voltage detection circuit outputting zero, the first voltage detection circuit and the second voltage detection circuit both outputting alternating current but the frequencies of the alternating current output by the first voltage detection circuit and the second voltage detection circuit are inconsistent, and the first voltage detection circuit outputting alternating current but the second voltage detection circuit outputting direct current), it is determined that the rail vehicle is in an abnormal working condition.

Further, the first voltage detection circuit includes two transformers, and the second voltage detection circuit also includes an implementation manner of a current limiting resistor R and a filter capacitor C, and the manner of calculating the actual grid voltage by the transmission control unit 20 is as follows:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer T1, the transformation ratio of the second transformer T2, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer T1, the resistance value of the current limiting resistor R and the capacitance value of the filter capacitor C; the alternating current-direct current voltage detection link comprises a voltage detection circuit 10 and an alternating current-direct current voltage sampling module;

calculating to obtain the power grid voltage under the alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit 10 according to the resistance value of the current limiting resistor R and the winding resistance of the primary coil of the first transformer T1;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit 10 and the second voltage signal.

Specifically, when the power supply system of the line is an alternating current power supply system, the voltage of the power grid is set to be U, and the amplitude is set to be U_ampThe angular frequency of the mains voltage is ω and the transformation ratio of the first transformer T1 is ωThe second transformer T2 has a transformation ratio ofThe primary coil winding resistance of the first transformer T1 is R_z. The secondary winding resistance of the first transformer T1 is ignored because there are fewer windings in the secondary winding of the first transformer T1. Since the primary and secondary windings of the second transformer T2 are much less wound than the primary winding of the first transformer T1, the resistance of the synchronous transformer is ignored. The current limiting resistor R has a resistance value of R_dThe capacitance value of the filter capacitor C is C, and the equivalent sampling resistance of the AC/DC voltage sampling module is R₃。

Therefore, in the AC system, the equivalent impedance X of the first transformer T1₁Comprises the following steps:

the current-limiting resistor R and the filter capacitor C together form an impedance X_rThe following were used:

is provided withY_cGiven as wC, then:

the total impedance X of the AC/DC voltage detection link is as follows:

is provided withThen there is

X＝R_n+jH_n (5)

Further, the current I flowing through the first transformer T1 in the ac/dc voltage detection link is:

further, the voltage U sampled by the equivalent sampling resistor of the AC/DC voltage sampling unit₃Comprises the following steps:

the voltage U sampled by the equivalent sampling resistor of the AC/DC voltage sampling unit₃Amplitude of U_3ampComprises the following steps:

the actual amplitude U of the network voltage can then be obtained from equation (8)_ampComprises the following steps:

voltage U sampled on equivalent sampling resistor of AC/DC voltage sampling unit₃The phase difference θ from the grid voltage U is:

furthermore, the digital signal processing unit obtains the angular frequency ω of the grid voltage according to equations (9) and (10) by a phase-locking algorithm, and calculates the actual grid voltage U as:

for the above phase-locking algorithm, the present application does not need to be described herein any more, and only needs to refer to the related description of the prior art.

When the power supply system of the line is an ac power supply system, the first transformer T1 has no electromagnetic induction, and therefore no voltage signal is output to the second transformer T2, and no voltage signal is output to the ac/dc voltage sampling unit by the second transformer T2, and therefore the digital signal processing unit does not detect a corresponding voltage. In this case, let the grid voltage be U_dnetThe winding resistance of the primary winding of the first transformer T1 is R_zSince the number of windings of the secondary winding of the first transformer T1 is small, the resistance of the winding of the secondary winding is ignored. Since the winding of the primary and secondary windings of the second transformer T2 is much smaller than that of the first transformer T1, the resistance of the second transformer T2 is ignored. Since the filter capacitor C has the characteristic of blocking direct current and alternating current, which is equivalent to open circuit for direct current power supply, the capacitance value C of the filter capacitor C is 0, and the resistance value of the current limiting resistor R is R_d。

Therefore, under the DC power supply system, the total impedance X of the voltage detection circuit_dComprises the following steps:

X_d＝R_z+R_d (12)

DC voltage U input by voltage sensor in second voltage detection circuit_dComprises the following steps:

further, the voltage of the power grid is U_dnetComprises the following steps:

therefore, in the direct current power supply system, when the digital signal processing unit calculates the actual voltage, only the U obtained by sampling calculation is needed_dAnd (4) performing compensation calculation by adopting the formula (14) to obtain the actual power grid voltage.

Further, on the basis of the above embodiment, the transmission control unit 20 controls the operation mode of the main circuit of the traction converter including:

if the power supply system of the line is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode; if the power supply system of the line is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current running mode; if the rail vehicle is in the non-electricity area, controlling a main circuit of the traction converter to be in an alternating current operation mode, and stopping the traction converter from operating; and if the rail vehicle is in an abnormal working condition, controlling a main circuit of the traction converter to be in an alternating current operation mode, and stopping the traction converter from operating.

Specifically, when the rail vehicle runs in the ac power supply area, the transmission control unit 20 determines that the power supply system is the ac power supply system, and at this time, the transmission control unit 20 controls the main circuit of the traction converter to be in the ac operation mode. When the rail vehicle runs to the non-electric area, the outputs of the first voltage detection circuit and the second voltage detection circuit are both zero, so the transmission control unit 20 stops the traction converter from running and controls the main circuit of the traction converter to be in an alternating current running mode. When the rail vehicle enters the dc power supply area, the transmission control unit 20 determines that the power supply system is the dc power supply system, and at this time, the transmission control unit 20 controls the main circuit of the traction converter to be in the dc operation mode. When the transmission control unit 20 determines that the rail vehicle is in an abnormal working condition, the transmission control unit 20 controls the main circuit of the traction converter to be in an alternating current operation mode, and stops the traction converter to operate, so as to ensure the safety of the traction converter.

Further, the transmission control unit 20 also sends the power supply system of the line and the operation mode of the main circuit of the traction converter to the cab display. Especially, when the transmission control unit 20 diagnoses an abnormal operation condition, the transmission control unit 20 transmits information of the abnormal operation condition and stopping of the traction converter to a display of a master control room through a train network communication bus to inform relevant persons of the condition.

In summary, the control device for the traction converter provided by the present application detects the grid voltage through the voltage detection circuit, and automatically determines the power supply system of the line and the actual grid voltage through the transmission control unit according to the voltage signal detected by the voltage detection circuit, and automatically controls the main circuit of the traction converter to operate in the corresponding mode. The control device replaces the traditional manual operation mode, effectively avoids the risk of manual operation errors, and improves the running safety of the railway vehicle.

In addition, the control device provided by the application is convenient to expand to two or more pantographs, and only the control device needs to be correspondingly added in a high-voltage power supply system of a traction converter of the two or more pantographs. For example, referring to fig. 3, a high-voltage power supply system including two pantographs and two traction converters is taken as an example:

the isolating switch is connected between the pantograph 1 and the pantograph 2, when the isolating switch is closed, the pantograph 1 rises to take power from a power grid, and the flashlight 2 keeps falling, the transmission control unit TCU1 of the traction transformer CI1 adopts the technical scheme provided by the application, so that the power supply system can be accurately detected, and the traction transformer is controlled to operate in the corresponding working condition. When abnormal working conditions occur, the abnormal information is reported to a cab display to prompt a driver. When the isolating switch is closed, the pantograph 2 rises and gets power from the power grid, and the flashlight pantograph 1 keeps falling, the transmission control unit TCU2 of the traction transformer CI2 can accurately detect the power supply system and control the traction transformer to operate in the corresponding working condition by adopting the technical scheme provided by the application. When abnormal working conditions occur, the abnormal information is reported to a cab display to prompt a driver. When the isolating switch is disconnected, the pantograph 1 and the pantograph 2 both lift the pantograph to get power from the power grid and respectively supply power to the two traction transformers, and the transmission control units of the two traction transformers adopt the technical scheme provided by the application, so that the power supply system can be accurately detected and the traction transformers are controlled to operate in corresponding working conditions. When abnormal working conditions occur, the abnormal information is reported to a cab display to prompt a driver.

The present application also provides a method for controlling a traction converter, which method is described below and which may be referred to in correspondence with the above-described arrangement. Referring to fig. 4, fig. 4 is a schematic flowchart of a control method of a traction converter according to an embodiment of the present application, and with reference to fig. 4, the method includes:

s101: receiving a voltage signal output by a voltage detection circuit;

s102: determining a power supply system of the line according to the voltage signal;

s103: calculating to obtain the power grid voltage according to the voltage signal;

s104: and controlling the operation mode of a main circuit of the traction converter according to the power supply system and the power grid voltage.

On the basis of the foregoing embodiment, as a preferred implementation, the receiving the voltage signal output by the voltage detection circuit includes:

receiving a first voltage signal output by a first voltage detection circuit and a second voltage signal output by a second voltage detection circuit;

the first voltage detection circuit comprises a transformer, and the first voltage detection circuit performs voltage reduction processing on the power grid voltage through the transformer and outputs a first voltage signal after voltage reduction processing; the second voltage detection circuit comprises a voltage sensor, and the second voltage detection circuit collects the voltage of the power grid through the voltage sensor and outputs a second voltage signal.

On the basis of the above embodiment, as a preferred implementation manner, the determining a power supply system of the line according to the voltage signal includes:

if the first voltage signal and the second voltage signal are both alternating current signals and the frequencies of the first voltage signal and the second voltage signal are the same, determining that the power supply system of the line is an alternating current power supply system;

if the first voltage signal is zero and the second voltage signal is a direct current signal, determining that the power supply system of the line is a direct current power supply system;

if the first voltage signal and the second voltage signal are both zero, determining that the rail vehicle is in a non-electricity area;

and if the first voltage signal is an alternating current signal and the second voltage signal is inconsistent with the first voltage signal, determining that the rail vehicle is in an abnormal working condition.

On the basis of the above embodiment, as a preferred implementation manner, calculating the grid voltage according to the voltage signal includes:

when the power supply system of the line is an alternating current power supply system, calculating to obtain the total impedance of the alternating current/direct current voltage detection link according to the transformation ratio of the first transformer, the transformation ratio of the second transformer, the equivalent sampling resistor of the alternating current/direct current voltage sampling module, the winding resistor of the primary coil of the first transformer, the resistance value of the current-limiting resistor and the capacitance value of the filter capacitor; the alternating current-direct current voltage detection link comprises a voltage detection circuit and an alternating current-direct current voltage sampling module;

calculating to obtain the power grid voltage under the alternating current power supply system according to the total impedance of the alternating current-direct current voltage detection link and the sampling voltage of the equivalent sampling resistor of the alternating current-direct current voltage sampling module;

when the power supply system of the line is a direct current power supply system, calculating to obtain the total impedance of the voltage detection circuit according to the resistance value of the current-limiting resistor and the winding resistance of the primary coil of the first transformer;

and calculating to obtain the power grid voltage under the direct current power supply system according to the total impedance of the voltage detection circuit and the second voltage signal.

On the basis of the above embodiment, as a preferred implementation manner, controlling an operation mode of a main circuit of a traction converter according to a power supply system and a grid voltage includes:

if the power supply system of the line is an alternating current power supply system, controlling a main circuit of the traction converter to be in an alternating current operation mode;

if the power supply system of the line is a direct current power supply system, controlling a main circuit of the traction converter to be in a direct current running mode;

if the rail vehicle is in the non-electricity area, stopping the traction converter from running, and controlling a main circuit of the traction converter to be in an alternating current running mode;

and if the rail vehicle is in an abnormal working condition, stopping the traction converter from running, and controlling a main circuit of the traction converter to be in an alternating current running mode.

On the basis of the above embodiment, as a preferred implementation, the method further includes:

and sending the power supply system of the line and the operation mode of the main circuit of the traction converter to a driver control room display.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The control device and method for the traction converter provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.