阅读说明：本技术 一种矩阵冗余型变频器系统 (Matrix redundancy type frequency converter system ) 是由 彭丽巧 王义增 彭丽敏 唐德军 于 2019-08-09 设计创作，主要内容包括：本发明公开了一种矩阵冗余型变频器系统,该系统包括：矩阵式变频器组和集成控制器,集成控制器与矩阵式变频器组之间连接通讯；矩阵式变频器组由多台变频器并联而成,各变频器的输入电压和输出电压等级相同；集成控制器,用于根据负载调整矩阵式变频器组中的变频器台数,以及计算生成控制波形并发送给矩阵式变频器组的每一台变频器,控制各台变频器的输出波形一致。本申请将多台变频器并联连接,组成矩阵式变频器组,通过集成控制器的控制作用,以并联、冗余协调的方式,满足大容量负载电机的需求,提高系统功率,组网过程中,根据系统所拖带的负载,冗余并联输出,可以提高系统的可靠性,保障产线正常运行。(The invention discloses a matrix redundancy type frequency converter system, which comprises: the matrix type frequency converter group and the integrated controller are connected and communicated; the matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, and the input voltage and the output voltage of each frequency converter are the same in grade; and the integrated controller is used for adjusting the number of the frequency converters in the matrix frequency converter group according to the load, calculating and generating a control waveform and sending the control waveform to each frequency converter of the matrix frequency converter group, and controlling the output waveforms of the frequency converters to be consistent. This application will many converter parallel connection, constitute matrix converter group to control effect through integrated controller to parallelly connected, redundant coordinated mode satisfies the demand of large capacity load motor, improves system power, and the network deployment in-process, according to the load that the system dragged, the parallelly connected output of redundancy can improve the reliability of system, and the normal operating is produced to the guarantee.)

1. A matrix-redundant type frequency converter system, comprising: the integrated controller is connected with the matrix type frequency converter group for communication;

the matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, and the input voltage and the output voltage of each frequency converter are same in grade;

and the integrated controller is used for adjusting the number of the frequency converters in the matrix type frequency converter group according to the load, calculating and generating a control waveform and sending the control waveform to each frequency converter of the matrix type frequency converter group, and controlling the output waveforms of the frequency converters to be consistent.

2. The system according to claim 1, wherein said integrated controllers comprise two identical sets, and communication is connected between two sets of said integrated controllers and between each set of integrated controllers and said matrix converter set; the during operation, one set of integrated control ware wherein is as main control unit, control matrix converter group work, one set of integrated control ware is as redundant control ware in addition, main control unit still will control the waveform send to redundant control ware, redundant control ware produce with the same control waveform of main control unit, with switch into main control unit during the main control unit trouble, control matrix converter group work.

3. The system according to claim 2, wherein optical fiber bus connection communication is adopted between two sets of said integrated controllers and between each set of said integrated controllers and said matrix converter group.

4. The system of claim 1, wherein in the matrix converter group, a high-voltage contactor is configured on the input side and the output side of each converter.

5. The system of claim 1, wherein in said matrix inverter group, a high voltage knife switch is configured on the output side of each of said inverters.

6. The system according to claim 1, characterized in that in the matrix converter group, an output reactor is arranged on the output side of each converter.

7. The system according to claim 1, wherein in the matrix converter group, each converter is individually configured with an input voltage sampling device and an output current sampling device and has an independent self-protection function.

8. The system of claim 1, wherein in the matrix converter group, each converter is a cascade converter with the same or different capacity.

9. The system of claim 1, wherein each of said matrix converters in said matrix converter group time compensates said control waveform after receiving said control waveform and operates according to the compensated and modified control waveform.

10. The system of claim 1, wherein each said inverter in said matrix inverter group sends its own operating status to said integrated controller, so that said integrated controller coordinates whether to activate the inverter according to the load.

Technical Field

The invention relates to the technical field of frequency converters, in particular to a matrix redundancy type frequency converter system.

Background

With the rapid development of industrialization and urbanization, the contradiction between energy constraint and environmental pollution is increasingly intensified. In order to achieve the aims of energy conservation and emission reduction, the energy utilization efficiency is improved, low-carbon economy is realized, and under the national guidance of high-energy-consumption heavy chemical industries such as steel, nonferrous metals, petroleum, chemical engineering, cement and the like, the low-energy-consumption heavy chemical industries are generally restricted to small production lines (large production lines with small pollution and high efficiency) and large production lines with small pollution and high efficiency (medium and small production lines with large pollution and low efficiency). Along with the increasing single-wire yield, the power of the motor matched with the single-wire yield is also increased (such as a blast furnace blower of a steel mill, a feed pump of a power plant, a western pneumatic transmission compressor and the like). And whether the increasingly-enlarged production line can normally operate for a long time or not and whether key equipment of the production line is safe or not are crucial to the normal operation of enterprises. Wherein, the large capacity power motor in the production line especially relates to whether whole production line can normally operate. In the production process, the abnormal shutdown of an important motor causes the shutdown of the whole production line, and a large amount of manpower and material resources are consumed for restarting; the heavy material causes the whole production line to be completely scrapped, and causes irreparable loss to users. Therefore, very high reliability requirements are placed on the power supply that supplies the motor.

Disclosure of Invention

In view of the problem of low reliability of the prior art high-capacity frequency converter, the invention provides a matrix redundancy type frequency converter system so as to overcome the problem.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to an aspect of the present invention, there is provided a matrix redundancy type frequency converter system, comprising: the integrated controller is connected with the matrix type frequency converter group for communication;

the matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, and the input voltage and the output voltage of each frequency converter are same in grade;

and the integrated controller is used for adjusting the number of the frequency converters in the matrix type frequency converter group according to the load, calculating and generating a control waveform and sending the control waveform to each frequency converter of the matrix type frequency converter group, and controlling the output waveforms of the frequency converters to be consistent.

Optionally, the integrated controllers comprise two sets of the same controllers, and the two sets of the integrated controllers and the matrix type frequency converter group are connected for communication; the during operation, one set of integrated control ware wherein is as main control unit, control matrix converter group work, one set of integrated control ware is as redundant control ware in addition, main control unit still will control the waveform send to redundant control ware, redundant control ware produce with the same control waveform of main control unit, with switch into main control unit during the main control unit trouble, control matrix converter group work.

Optionally, the two sets of integrated controllers and each set of integrated controller and the matrix frequency converter group are connected and communicated by using an optical fiber bus.

Optionally, in the matrix-type frequency converter group, a high-voltage contactor is configured on an input side and an output side of each frequency converter.

Optionally, in the matrix-type frequency converter group, a high-voltage disconnecting link is configured on the output side of each frequency converter.

Optionally, in the matrix-type frequency converter group, an output reactor is configured on an output side of each frequency converter.

Optionally, in the matrix-type frequency converter group, each frequency converter is individually configured with an input voltage sampling device and an output current sampling device, and has an independent self-protection function.

Optionally, in the matrix converter group, each converter is a cascade converter with the same or different capacity.

Optionally, in the matrix frequency converter group, after receiving the control waveform, each frequency converter performs time compensation on the control waveform, and operates according to the control waveform after compensation and correction.

Optionally, in the matrix-type frequency converter group, each frequency converter sends its own operating state to the integrated controller, so that the integrated controller coordinates whether to start the frequency converter according to a load.

In conclusion, the beneficial effects of the invention are as follows:

the matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, the number of the frequency converters of a networking mode in the matrix type frequency converter group is adjusted according to load through the control effect of the integrated controller, and the output waveforms of the frequency converters are controlled to be consistent by using unified control waveforms, so that the requirements of a large-capacity load motor are met in a parallel connection and redundancy coordination mode, the system power is improved, the reliability of the system can be improved according to the load dragged by the system in the networking process, the redundancy parallel output is realized, and the normal operation of a production line is guaranteed.

Drawings

Fig. 1 is a schematic diagram of a matrix redundancy type frequency converter system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a matrix redundancy type frequency converter system according to another embodiment of the present invention;

fig. 3 is a schematic diagram of a cascaded frequency converter in the matrix redundancy type frequency converter system according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The technical conception of the invention is as follows: the matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, the number of the frequency converters of a networking mode in the matrix type frequency converter group is adjusted according to load through the control effect of the integrated controller, and the output waveforms of the frequency converters are controlled to be consistent by using unified control waveforms, so that the requirements of a large-capacity load motor are met in a parallel connection and redundancy coordination mode, the system power is improved, the reliability of the system can be improved according to the load dragged by the system in the networking process, the redundancy parallel output is realized, and the normal operation of a production line is guaranteed.

Fig. 1 is a schematic diagram of a matrix redundancy type frequency converter system according to an embodiment of the present invention, and as shown in fig. 1, the matrix redundancy type frequency converter system includes: matrix converter group and integrated control ware, the communication is connected between integrated control ware and the matrix converter group.

The matrix type frequency converter group is formed by connecting a plurality of frequency converters in parallel, and the input voltage and the output voltage of each frequency converter are the same in grade.

And the integrated controller is used for adjusting the number of the frequency converters in the matrix frequency converter group according to the load, calculating and generating a control waveform and sending the control waveform to each frequency converter of the matrix frequency converter group, and controlling the output waveforms of the frequency converters to be consistent.

This application redundant type converter system of matrix will many converters connect in parallel and form matrix converter group to enlarged system power can satisfy the demand of dragging large capacity motor load. The integrated controller can determine the number of the frequency converters of the network according to the load condition, and output a uniform control waveform to control the output waveforms of the frequency converters to be consistent, so that the output voltage amplitudes, the frequencies and the phases of the frequency converters are consistent, the load is flexibly supplied with power in a parallel redundancy mode, and because the output voltage amplitudes, the frequencies and the phases of the frequency converters are consistent, circulation currents generated among the frequency converters connected in parallel can be avoided, and the power of a redundant matrix type frequency converter group can be effectively ensured.

In one embodiment of the present invention, to meet the requirement of large capacity motor, the transformer is a high voltage frequency converter, i.e. the voltage is above 6 KV.

Fig. 2 is a schematic diagram of a matrix redundancy type frequency converter system according to another embodiment of the present invention, in which an integrated controller is a brain of the system, and plays important roles in coordinating and synchronizing parameters of each frequency converter, controlling the number of frequency converters of a matrix frequency converter group according to load, and the like in the system, so in order to ensure the reliability of the system, two sets of integrated controllers A, B are used in the embodiment shown in fig. 2 to form an integrated controller group. In the embodiment shown in fig. 2, the integrated controllers include two sets of the same integrated controllers, and the two sets of integrated controllers and each set of integrated controller and the matrix converter group are connected for communication. During operation, one set of integrated control ware wherein is as main control unit, controls matrix converter group work, and one set of integrated control ware is as redundant control ware in addition, and main control unit still sends control waveform to redundant control ware, and redundant control ware produces the control waveform the same with main control unit to switch into main control unit when main control unit trouble, control matrix converter group work.

There is no fixed master-slave between two sets of integrated controllers, one of them can be made as master controller by external means, and another is made as redundant controller. In fig. 2, the integrated controller a is a main controller, and the integrated controller B is a redundant controller.

Preferably, in the embodiment shown in fig. 2, the two sets of integrated controllers and the matrix frequency converter group are connected and communicated by using optical fiber buses, so as to achieve the effect of real-time and fast communication.

Fig. 3 is a schematic diagram of an embodiment of the frequency converter used in the matrix redundancy type frequency converter system of the present application, and as shown in fig. 3, each frequency converter is individually configured with an input voltage sampling device and an output current sampling device, and each frequency converter has an independent self-protection function, so that in the matrix type frequency converter group, each frequency converter is independent from each other, and each frequency converter independently completes the power-on, power-off and self-protection functions.

In one embodiment of the present invention, preferably, in the matrix converter group, each converter performs time compensation on the control waveform after receiving the control waveform, and operates according to the control waveform after compensation and correction. Through time compensation, the time difference of sending the control waveforms to each frequency converter by the integrated controller can be reduced, and the consistency of the control waveforms is further improved, so that the consistency of the output waveforms of each frequency converter is more reliably ensured, and the influence of circulation is avoided.

In one embodiment of the present invention, preferably, in the matrix converter group, each converter also actively sends its own operating status to the integrated controller, so that the integrated controller coordinates whether to activate the converter according to the load. Therefore, each frequency converter can select networking or network quitting according to the running state of the frequency converter, and in the networking process, the integrated controller selects one frequency converter or two frequency converters for redundancy according to the power of the load motor to be dragged and the importance degree in the system, so that the reliability of the system can be improved, and the normal running of a production line can be guaranteed.

As shown in fig. 2, in the matrix converter group, high-voltage contactors (as shown in KM11, KM11, KM21, KM22, KMn1, and KMn2 in fig. 2) are disposed at the input side and the output side of each converter, so as to facilitate powering on and powering off, networking, and network withdrawing of the converters. In addition, in the matrix frequency converter group, a high-voltage knife switch (as shown in QS11, QS21 and QSn1 in fig. 2) with an obvious breakpoint is also configured at the output side of each frequency converter, so that the load motor can be conveniently disconnected from the output network completely during operation to be overhauled. In addition, in order to reduce the influence of circulation current on the frequency converters in the matrix type frequency converter group during load fluctuation, speed rising and speed falling, the system is additionally provided with output reactors (shown as a No. 1 reactor, a No. 2 reactor and a No. n reactor in fig. 2) on the output sides of the frequency converters, and the output reactors are used for limiting the quick change or the sharp prick of the circulation current caused by the sudden change of the voltage at the input side of a certain frequency converter, so that the reliability of the system is ensured to the maximum extent, and the normal production of a production line is ensured.

The working principle of the matrix redundancy type frequency converter system is illustrated by the embodiment shown in fig. 2:

as shown in fig. 2, the cascaded transformers with the same or different capacities are selected to form a matrix-type frequency converter group, and the frequency converters are connected in parallel and have the same input and output voltage levels. And each frequency converter reports networking and network quitting information to the integrated controller according to the self-running state, and the integrated controller coordinates whether the redundant frequency converter in the system needs to be awakened or not according to the load of the dragged load motor.

A. And B, the two sets of integrated controllers have no fixed master-slave division, and when the two sets of integrated controllers run on line, the two sets of integrated controllers can receive and send signals to each frequency converter in real time in parallel. The integrated controller A, B selects "master" with the external trigger signal, and after the integrated controller a is selected as "master" due to the external trigger signal, the "master" flag is issued to each frequency converter. And each frequency converter analyzes the control signals transmitted by the two sets of integrated controllers in the interruption and performs time compensation to ensure that the output waveforms of the frequency converters are consistent. Specifically, each frequency converter controls the frequency converter to operate according to the compensated and corrected signal of the 'main' controller, signals transmitted by a non- 'main' controller are abandoned, the on-off control signals of the IGBTs are consistent when the frequency converters are in ascending and descending speed and in steady-state operation, and the output voltage waveform is in the range of the safe operation requirement of each frequency converter. When one of the two sets of controllers exits due to a fault or only one set of controller exists in the system, the rest set of controller can not receive signals transmitted by the other set of controller, and the controller is quickly self-adjusted to be a main controller and monitors the response of the other set of integrated controller in the system constantly.

To sum up, this application has enlarged system capacity and power on prior art's basis through parallelly connected the constitution matrix converter group with a plurality of converters, can provide the variable frequency power supply who satisfies the demand for single large capacity motor. In the preferred embodiment, the system adopts two sets of integrated controllers to form an integrated controller group, optical fiber parallel rapid communication is adopted between the integrated controllers and the frequency converter, and an output reactor is additionally arranged on the output side of the frequency converter to reduce the grid-connected risk of the alternating current power supply. A plurality of converters redundancy combination in matrix converter group, each converter can be at any time the network deployment, move back the net to improve system reliability, thereby reduce the risk of producing line system operation, the normal operating of line is produced in the guarantee.

While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.