Adaptive PI double-closed loop control method for static var generator

Abstract

The invention relates to an adaptive PI double-closed loop control method for a static var generator. The method includes the following steps that: a grid voltage is sampled, a grid angle is obtained,the upper bus-bar voltage and lower bus-bar voltage of a direct-current bus-bar are collected; a total bus voltage is calculated; an active axis voltage stabilized direct-current component is calculated; an alternating-current active current component required by three-phase voltage stabilization is calculated; a direct-current component is calculated; the total command of a current loop is calculated; an adaptive PI regulator is adopted to perform control, so that three-phase modulation waves can be obtained; modulation is performed, so that driving pulses are obtained; and an inverter is driven to obtain reactive current output. With the adaptive PI regulator used in a double-closed loop control system adopted, the defects of low response speed and poor following performance of a traditional regulator when the operation conditions of the system change can be eliminated; PI parameters are automatically adjusted according to the change of the operating conditions; and therefore, the whole control system is adjusted to operate in an optimal working state. Thus, the adaptive PI double-closed loop control method can effectively adapt to application scenes in which a plurality of working conditions change and has a broad application prospect.

Description

technical field [0001] This application relates to the field of power electronic control, in particular to an adaptive PI double-closed-loop control method for static var generators. Background technique [0002] There is a very large market space in the field of reactive power compensation. In the past, it was mostly the reactive power compensation demand of industrial sites. Because of the consideration of power factor in industrial sites, reactive power compensation has become a rigid demand, but most of them are three-phase three-phase. In the past few decades, passive compensation equipment such as capacitors was mostly used. Later, due to the performance advantages of active static var generators and the gradual reduction in prices, the application of static var generators is increasing. There is a tendency to gradually share the reactive power market with passive ones. With the guidance of the market, the static var generator has become a very hot research hotspot. ...

AI Technical Summary

Problems solved by technology

These two problems have affected the application of static var generators in distribution network sites

Among them, the P regulator is a proportional control, which cannot eliminate the residual error, but its control speed is very fast, but the control accuracy is not high, and it is suitable for systems with less strict requirements.

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