Static var compensator and control method based on model prediction

Abstract

The invention relates to a static var compensator and a control method based on model prediction. The method comprises the steps of obtaining the electrical parameters of a DC side and an AC side of any one power submodule in the static var compensator based on the improved topology of the static var compensator, and predicting switching coefficients of two bridge arm switches of an H bridge in the power sub-module according to the electrical parameters, and controlling the bridge arm switches of the H bridge according to the switching coefficients. Based on this, based on a circuit structure different from a traditional static var compensator, linear control is carried out through a control method based on model prediction, and the problem of overmodulation caused by linear superposition of an AC side and a DC side in the static var compensator is avoided.

Description

technical field [0001] The invention relates to the technical field of high-voltage distribution network, in particular to a static var compensator and a control method based on model prediction. Background technique [0002] The emergence of more and more high-tech industries and high value-added industries has put forward higher requirements for power quality. High-quality power parks are an effective solution to the problem of regional high-quality power supply. Once a short-circuit interruption and sag occurs on the feeder of the distribution network, it will cause significant economic losses. [0003] Based on the topology of dual-circuit power supply and the cooperative operation of various power quality management devices, a solid-state switch needs to control the switching of two thyristors to realize the switching of the main and backup power sources, thereby solving the problem of voltage drops and interruptions. However, the switching time of the thyristor is rel...

AI Technical Summary

Problems solved by technology

However, the traditional static var compensator requires more switching tubes, which increases the cost of the static var compensator

However, changing the switch tube design of the traditional static var compensator will change the signal modulation method of the traditional static var compensator, and the superimposed DC modulation signal will increase the peak value of the overall modulation signal, resulting in the use of traditional static var compensators. The linear control method cannot meet its control requirements

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