Modular medium-voltage waveform generator loss equalization control method and system

Abstract

The invention discloses a modular medium-voltage waveform generator loss equalization control method and system. The method comprises the steps: taking each bridge arm of a modular medium-voltage waveform generator as a control target, building a model prediction control evaluation function comprising input, output and internal control variables, taking the optimal tracking performance as a control target, and selecting the optimal level number of each bridge arm; and for each full-bridge sub-module in one bridge arm, when a switching signal is configured, configuring the switching state of apower switching device in a balanced manner by taking equal action times of a left bridge arm and a right bridge arm of the sub-module as a target, so that on the premise of ensuring accurate trackingof input current, output current and internal circulation and sub-module capacitor voltage balance control, the effect of balanced distribution of internal losses of the modular medium-voltage waveform generator is achieved, and the operation reliability of the modular medium-voltage waveform generator is improved.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a method and system for controlling loss equalization of a modular medium-voltage waveform generator. Background technique [0002] The modular medium-voltage waveform generator can generate specific sine waves, various harmonics, triangular waves, square waves, voltage dips, voltage swells and other power signals, and has the ability to measure the impedance of new energy microgrids and build power grid simulations. Platform, providing ship shore power supply and other functions, widely used in the field of industrial production. The modular medium-voltage waveform generator adopts a modular multi-level structure to improve device redundancy, output power quality and power level. The sub-module adopts a full-bridge structure, which can realize DC or AC power conversion. Existing literature has proposed related solutions to the problems of voltage ripple, energy...

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Problems solved by technology

Existing literature has proposed related solutions to the problems of voltage ripple, energy imbalance, and output current harmonic suppression caused by this structure, but these methods only improve a certain operating characteristic, and it is difficult to control the above-mentioned performances; At the same time, the existing research did not consider the internal wear leveling of the sub-modules when distributing the switching signals of the sub-modules, which caused some switching devices in some sub-modules to operate for a long time, which increased the loss of the devices and affected the operational reliability of the sub-modules.

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