H-bridge cascaded statcom deadbeat control method based on discrete state observer and sliding mode observer

Abstract

The invention discloses an H-bridge cascading STATCOM dead-beat control method based on a discrete state observer and a discrete sliding-mode observer, and relates to the H-bridge cascading STATCOM control technology. The H-bridge cascading STATCOM dead-beat control method aims to solve the problem that an existing dead-beat control method must be matched with a good reference current prediction method and a common prediction method needs to be dependent on an accurate mathematical model, so that the existing dead-beat control method is seriously limited in actual application. According to the H-bridge cascading STATCOM dead-beat control method, the discrete state observer is constructed according to a simple mathematical model of an H-bridge cascading STATCOM, and a reference instruction current at a k+1 moment is obtained by means of calculation at a k moment by adopting the prediction function of the discrete state observer, so that dead-beat control is realized in a true sense; the discrete sliding-mode observer is constructed for conducting real-time observation on ud (k) and uq (k) of three-phase voltage values output by the STATCOM under a dq coordinate system. The H-bridge cascading STATCOM dead-beat control method based on the discrete state observer and the discrete sliding-mode observer is applied to reactive compensation and harmonic wave filtering of a power grid.

Description

technical field [0001] The invention relates to H-bridge cascaded STATCOM control technology, in particular to a harmonic control method. Background technique [0002] With the widespread use of nonlinear loads in the power grid, the generated reactive power and harmonic currents have a serious impact on the power grid. Rapid reactive power compensation and harmonic filtering are of great practical significance to improve the stability of the power grid. H-bridge cascaded STATCOM has become an important direction for the development of dynamic reactive power compensation devices due to its advantages of low loss, fast response, small volume of energy storage components and low harmonic content of output current, and is a research hotspot at home and abroad. figure 1 The block diagram of the main circuit for H-bridge cascaded STATCOM. [0003] At present, the commonly used current control methods mainly include hysteresis loop comparison control, active and reactive power de...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing deadbeat control method must cooperate with a good reference current prediction method, but the commonly used prediction method needs to rely on an accurate mathematical model, which leads to the problem that the control method is greatly limited in practical application , provides a H-bridge cascaded STATCOM deadbeat control method based on discrete state observer and sliding mode observer

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