阅读说明：本技术 轨道交通设备的试验电源及其控制方法 (Test power supply of rail transit equipment and control method thereof ) 是由 胡景瑜 张志学 王跃 彭赟 李程 仇乐兵 付刚 吴奕 孙璐 陈欣 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种轨道交通设备的试验电源及其控制方法,该实验电源包括至少一个供电参数变换设备和每个供电参数变换设备一一对应的控制器；每个供电参数变换设备包括输入变压器、输出变压器和多个并联的变流器；每个变流器包括变流组件和调控组件,输入变压器用于将外部供电电压进行变换,得到变流器的输入电压；控制器根据预设的目标供电频率,生成目标调制信号；每个调控组件用于根据目标调制信号对变流组件进行调控,以使变流组件将变流器的输入电压对应的原始供电频率变换至目标供电频率；输出变压器用于将变流器的输出电压变换至目标电压。这样,可以适应各种变压变频需求。采用本发明的技术方案,能够提高试验电源变频变压的效率。(The invention discloses a test power supply of rail transit equipment and a control method thereof, wherein the test power supply comprises at least one power supply parameter conversion equipment and controllers corresponding to the power supply parameter conversion equipment one to one; each power supply parameter transformation device comprises an input transformer, an output transformer and a plurality of parallel converters; each converter comprises a current converting assembly and a regulating assembly, and the input transformer is used for converting external power supply voltage to obtain input voltage of the converter; the controller generates a target modulation signal according to a preset target power supply frequency; each regulating and controlling component is used for regulating and controlling the current transformation component according to the target modulation signal so that the current transformation component transforms the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency; the output transformer is used for converting the output voltage of the converter to a target voltage. Therefore, the device can meet various requirements of voltage transformation and frequency conversion. By adopting the technical scheme of the invention, the frequency conversion and voltage transformation efficiency of the test power supply can be improved.)

1. The test power supply of the rail transit equipment is characterized by comprising at least one power supply parameter conversion equipment and controllers which are in one-to-one correspondence with the power supply parameter conversion equipment;

each power supply parameter transformation device comprises an input transformer, an output transformer and a plurality of parallel converters;

each converter comprises a converter component and a regulation component, and the converter component is connected with the regulation component;

the output end of the input transformer is respectively connected with the input end of each converter;

the output end of each converter is connected with the input end of each output transformer;

the input transformer is used for converting an external power supply voltage to obtain an input voltage of the converter;

the controller is used for generating a target modulation signal according to a preset target power supply frequency;

each regulating and controlling component is used for regulating and controlling the current transformation component according to the target modulation signal so that the current transformation component transforms the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency;

the output transformer is used for converting the output voltage of the converter to a target voltage.

2. The experimental power supply of the rail transit equipment as claimed in claim 1, wherein the controller is configured to receive an actual output voltage of the output transformer sent by the data acquisition and monitoring control equipment, obtain an error voltage according to the actual output voltage and a preset reference voltage, perform proportional-integral resonance adjustment on the error voltage to obtain a feedback modulation signal, and generate the target modulation signal according to the feedback modulation signal.

3. The experimental power supply of rail transit equipment as claimed in claim 2, wherein the controller is further configured to calculate the reference voltage according to a transformation ratio coefficient of the output transformer to obtain a calculation result; correcting the calculation result by using a preset modulation ratio correction coefficient to obtain a feedforward modulation signal; and generating the target modulation signal according to the feedforward modulation signal and the feedback modulation signal.

4. The experimental power supply of rail transit equipment as claimed in claim 2, wherein said controller is further configured to perform characteristic subharmonic suppression processing on said error voltage, perform specific resonance adjustment on the processed error voltage to obtain a first adjustment result, and generate said target modulation signal according to said first adjustment result and said feedback modulation signal.

5. The rail transit equipment test power supply of claim 3, wherein the controller is further configured to receive the bus output current, the filter current and the output current of each converter collected by the data collection and monitoring control equipment;

the regulation and control component is further used for determining average currents of all the converters and error currents of each converter, performing proportional resonance regulation on the error currents to obtain a second regulation result, correcting the second regulation result by using a preset modulation wave correction coefficient to obtain a correction result, performing amplitude limiting processing on the correction result to obtain a current-sharing correction value, and regulating and controlling the converter component by using the regulated target modulation signal after regulating the target modulation signal by using the current-sharing correction value;

and the average current of all the converters is determined by the regulation and control component according to the output currents of all the converters, and/or determined according to the bus output current and the filtering current.

6. The rail transit equipment test power supply of claim 1, wherein the current conversion assembly comprises an inverter.

7. The test power supply of rail transit equipment of claim 1, wherein the converter assembly comprises a rectifier and an inverter.

8. The test power supply of the rail transit equipment as claimed in claim 1, wherein if the number of the controllers is plural, two adjacent controllers are connected;

and data interaction is carried out between two adjacent controllers so as to synchronously control all the power supply parameter conversion equipment.

9. The rail transit equipment test power supply of claim 1, wherein each of the power supply parameter transformation devices further comprises a filter connected to the output transformer;

the filter is used for filtering the target voltage.

10. A power supply control method of a test power supply applied to the rail transit equipment as claimed in any one of claims 1 to 9, comprising:

converting an external power supply voltage through the input transformer to obtain an input voltage of the converter;

generating a target modulation signal according to a preset target power supply frequency through the controller, and sending the target modulation signal to each regulation and control component;

regulating and controlling the current transformation assembly through each regulating and controlling assembly according to the target modulation signal so that the current transformation assembly converts the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency;

and converting the output voltage of the converter to a target voltage through the output transformer.

Technical Field

The invention belongs to the technical field of rail transit, and particularly relates to a test power supply of rail transit equipment and a control method thereof.

Background

The test power supply of the rail transit equipment is an auxiliary power supply required by an electric system test in a traction system of the rail transit equipment such as an electric locomotive or a motor car, and is mainly used for assisting in completing various types of test items and routine tests such as protection actions and characteristic tests.

Under the normal condition, the voltage and the frequency of the test power supply are relatively stable and do not need voltage transformation and frequency conversion, but the voltage and the frequency required by the foreign rail transit equipment are inconsistent with the voltage and the frequency required by the national rail transit equipment, so that the test power supply corresponding to the foreign voltage and frequency standard is always required to be equipped if the foreign rail transit equipment is introduced. In the prior art, most of the variable frequency generator sets are adopted for realizing the variable frequency generator sets, but when the variable frequency generator sets are used for carrying out variable voltage and variable frequency, the capacity of the variable frequency generator sets is generally smaller, and the construction period is long.

Therefore, how to efficiently perform frequency conversion and voltage transformation on a test power supply is an urgent technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention mainly aims to provide a test power supply of rail transit equipment and a control method thereof, so as to realize efficient frequency and voltage conversion of the test power supply.

Aiming at the problems, the invention provides a test power supply of rail transit equipment, which comprises at least one power supply parameter conversion equipment and controllers corresponding to the power supply parameter conversion equipment one to one;

each power supply parameter transformation device comprises an input transformer, an output transformer and a plurality of parallel converters;

each converter comprises a converter component and a regulation component, and the converter component is connected with the regulation component;

the output end of the input transformer is respectively connected with the input end of each converter;

the output end of each converter is connected with the input end of each output transformer;

the input transformer is used for converting an external power supply voltage to obtain an input voltage of the converter;

the controller is used for generating a target modulation signal according to a preset target power supply frequency;

each regulating and controlling component is used for regulating and controlling the current transformation component according to the target modulation signal so that the current transformation component transforms the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency;

the output transformer is used for converting the output voltage of the converter to a target voltage.

Further, in the above test power supply for rail transit equipment, the controller is configured to receive an actual output voltage of the output transformer sent by the data acquisition and monitoring control device, obtain an error voltage according to the actual output voltage and a preset reference voltage, perform proportional-integral resonance adjustment on the error voltage to obtain a feedback modulation signal, and generate the target modulation signal according to the feedback modulation signal.

Further, in the above test power supply for rail transit equipment, the controller is further configured to calculate the reference voltage according to a transformation ratio coefficient of the output transformer, so as to obtain a calculation result; correcting the calculation result by using a preset modulation ratio correction coefficient to obtain a feedforward modulation signal; and generating the target modulation signal according to the feedforward modulation signal and the feedback modulation signal.

Further, in the above test power supply for a rail transit device, the controller is further configured to perform characteristic subharmonic suppression processing on the error voltage, perform specific resonance adjustment on the processed error voltage to obtain a first adjustment result, and generate the target modulation signal according to the first adjustment result and the feedback modulation signal.

Further, in the above test power supply for rail transit equipment, the controller is further configured to receive the bus output current, the filtering current and the output current of each converter, which are collected by the data collection and monitoring control device;

the regulation and control component is further used for determining average currents of all the converters and error currents of each converter, performing proportional resonance regulation on the error currents to obtain a second regulation result, correcting the second regulation result by using a preset modulation wave correction coefficient to obtain a correction result, performing amplitude limiting processing on the correction result to obtain a current-sharing correction value, and regulating and controlling the converter component by using the regulated target modulation signal after regulating the target modulation signal by using the current-sharing correction value;

and the average current of all the converters is determined by the regulation and control component according to the output currents of all the converters, and/or determined according to the bus output current and the filtering current.

Further, in the above test power supply for rail transit equipment, the converter component includes an inverter.

Further, in the above test power supply for rail transit equipment, the converter assembly includes a rectifier and an inverter.

Further, in the above test power supply for rail transit equipment, if the number of the controllers is multiple, two adjacent controllers are connected;

and data interaction is carried out between two adjacent controllers so as to synchronously control all the power supply parameter conversion equipment.

Furthermore, in the above test power supply for rail transit equipment, each of the power supply parameter transformation equipment further includes a filter connected to the output transformer;

the filter is used for filtering the target voltage.

The invention also provides a power supply control method of the test power supply applied to the rail transit equipment, which comprises the following steps:

converting an external power supply voltage through the input transformer to obtain an input voltage of the converter;

generating a target modulation signal according to a preset target power supply frequency through the controller, and sending the target modulation signal to each regulation and control component;

regulating and controlling the current transformation assembly through each regulating and controlling assembly according to the target modulation signal so that the current transformation assembly converts the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency;

and converting the output voltage of the converter to a target voltage through the output transformer.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

the invention relates to a test power supply of rail transit equipment and a control method thereof, wherein the input voltage of a converter in the power supply parameter conversion equipment is obtained by the external power supply voltage through an input transformer in the power supply parameter conversion equipment, and input into the converter, the regulation and control component in the converter responds to the target modulation signal generated by the controller according to the preset target power supply frequency, the current transformation component is regulated and controlled to ensure that after the current transformation component transforms the original power supply frequency corresponding to the input voltage of the current transformer to the target power supply frequency, then the output voltage of the converter is converted to the target voltage by the output transformer, thus, under the condition of not additionally constructing a variable frequency generator set, the variable voltage and variable frequency of the test power supply can be realized, the variable voltage and variable frequency test power supply adapts to various variable voltage and variable frequency requirements, and the number of the converters can be set according to actual requirements so as to realize the capacity adjustment of the test power supply. By adopting the technical scheme of the invention, the frequency conversion and voltage transformation efficiency of the test power supply can be improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a topology of an embodiment of a test power supply of a rail transit apparatus according to the present invention;

FIG. 2 is a schematic diagram of another topology of an embodiment of a test power supply of the rail transit equipment of the present invention;

FIG. 3 is a control schematic diagram of a test power supply of the rail transit equipment of the present invention;

fig. 4 is a flowchart of an embodiment of a power supply control method of a test power supply of a rail transit device according to the invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.