Modular Medium Voltage Waveform Generator Loss Leveling Control Method and System

Abstract

The invention discloses a loss equalization control method and system of a modularized medium-voltage waveform generator. Each bridge arm of the modularized medium-voltage waveform generator is used as a control target, and a model prediction including input, output and internal control variables is established. Control the evaluation function, with the optimal tracking performance as the control target, select the optimal level number of each bridge arm; for each full-bridge sub-module in a bridge arm, when configuring the switch signal, use the left bridge of the sub-module The goal is to equalize the number of actions of the right bridge arm and the right bridge arm, and balance the switching states of the power switching devices to achieve a modularized medium voltage under the premise of ensuring accurate tracking of the input current, output current, internal circulation current and sub-module capacitor voltage balance control. The effect of balanced distribution of losses inside the waveform generator improves the operational reliability of the modular medium voltage waveform generator.

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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