A Circulating Current and Reactive Power Control Method for Parallel Matrix Converter
A technology of matrix converters and converters, applied in the direction of conversion equipment that can be converted to direct current without intermediate conversion, high-efficiency power electronic conversion, output power conversion devices, etc., can solve coupling and produce interactive effects, power factor deterioration , Reactive power control capability and voltage utilization ratio mutual constraints, etc., to solve the problem that reactive power compensation cannot be continuously realized, promote development and application, and improve input reactive power control capability
Active Publication Date: 2022-03-22
SOUTHEAST UNIV
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[0003] In order to meet the actual work requirements, a filter capacitor needs to be installed on the input side of the matrix converter during normal operation. The filter capacitor will generate a capacitive reactive power proportional to the input frequency, and the capacitive reactive power will also vary with the load. However, the power factor of the power supply is seriously deteriorated. In order to prevent the deterioration of the power factor of the power supply, it is necessary to compensate the capacitive reactive power generated by the filter capacitor through the input reactive power control of the matrix converter. However, due to the lack of bus energy storage in the matrix converter component, its input reactive power control and load control will be directly coupled and interact with each other, so that the maximum reactive power control capability and voltage utilization of the matrix converter are mutually restricted. In some cases, the matrix converter will not be able to continuously achieve reactive power compensation
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0035] According to the input reactive power control model of the matrix converter, it can be known that the input reactive power is synthesized by the output current, and when the output current of the matrix converter is sufficient, sufficient input reactive power can be generated; and when the output current of the matrix converter is not enough to synthesize When reactive power is input, it will appear that the matrix converter cannot continuously realize reactive power compensation. From the above analysis, it can be known that the fundamental reason why the matrix converter cannot continuously realize reactive power compensation is that its own output current is ...
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The present invention relates to the technical field of power converters, in particular to a method for controlling circulating current and reactive power of a parallel matrix converter. The following scheme is proposed, which includes forming an off-line lookup table by establishing fitting coefficients of the matrix converter in different operating states According to the off-line lookup table, calculate the reference circulating current that meets the input reactive power requirements of the matrix converter and the reference input reactive current of each converter, decompose the actual output current of the matrix converter to generate the actual circulating current, and perform closed-loop control on the actual circulating current , calculate the reference output voltage of each converter according to the differential mode voltage, modulate each converter according to the reference input reactive current and the reference output voltage, and control the on / off state of each converter. The invention transforms the output current of each converter by generating circulating current in parallel matrix converters, so that each converter can obtain an ideal input reactive current, and solves the problem that the matrix converter cannot continuously realize reactive power compensation.
Description
technical field [0001] The invention relates to the field of power converters, in particular to a method for controlling circulating current and reactive power of parallel matrix converters. Background technique [0002] As a high power density direct AC-AC power converter, the matrix converter can realize the direct conversion of parameters such as AC amplitude, phase, frequency, etc. Compared with the traditional AC-DC-AC converter or dual PWM converter, the matrix converter The converter has no intermediate DC energy storage link, and can obtain excellent speed regulation performance with a very compact circuit structure, which is conducive to greatly improving the power density of the entire system. Generally speaking, in medium and high power applications, the use of matrix converters The system power density can reach more than 1.5 times of the system power density using traditional AC-DC-AC converter or double PWM converter. [0003] In order to meet the actual work ...
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IPC IPC(8): H02M5/04H02M1/088H02M1/42
CPCH02M5/04H02M1/088H02M1/4208Y02B70/10
Inventor 雷家兴黄鑫林冯双
Owner SOUTHEAST UNIV