Low-frequency operation integrated control system and method of modularization multi-level converters
A modular multi-level, comprehensive control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of limiting the degree of suppression of low-frequency ripples, easy generation of internal circulation, Issues that affect the performance of capacitor voltage balance control under low frequency conditions
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[0145] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0146] figure 1 A schematic diagram of a typical three-phase topology of a modular multilevel converter is given. The upper / lower bridge arm of each phase is composed of N sub-modules, and the structure of each sub-module is as follows figure 1 shown.
[0147] An integrated control system for low-frequency operation of a modular multilevel converter, which includes an M-phase modular multilevel converter 9, each phase modular multilevel converter 6 is connected to its own integrated control device 8, and the integrated The control device 8 is connected to the PWM signal generator 7; wherein, the comprehensive control device 8 includes a low-pass filter unit 4, an average value calculation unit C5, an upper bridge arm controller 2, a general controller 1 and a lower bridge arm controller 3; The output end of the modular multilevel converter 6 of each ...
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