Non-static decoupling control method for reactive power negative sequence harmonic current PI

Abstract

The invention relates to a non-static decoupling control method for reactive power negative sequence harmonic current PI, and belongs to the technical field of electrician customer power. By a method for eliminating alternating current disturbance quantity formed by other current components, direct current component of a compensation current component can be acquired, and the PI non-static tracking to command current can be realized through the conversion of simple algorithms in a synchronous reference frame (SFR) corresponding to each compensation current component mainly aiming at the current PI tracking control over a distribution static synchronous compensator (DSTATCOM), an active power filter (APF) and other power quality treatment devices. By the method, the device not only can realize independent non-static tracking compensation of reactive power or a negative sequence or a certain harmonic current component in the SFR, but also can realize comprehensive PI non-static compensation for each current component. Compared with other compensation methods in SFR, the method has the advantages that: the algorithm is simple, engineering is easy to implement, control accuracy is high, and real time property is high due to the absence of a time delay link.

Description

technical field [0001] The invention relates to a PI static-difference-free decoupling control method for reactive negative-sequence harmonic current, and belongs to the technical field of electric power for electrician users. Background technique [0002] The current PI non-static decoupling control technology is mainly used in the current direct tracking control of power quality control devices such as distribution static synchronous compensator (DSTATCOM) and power active filter (APF). This technology is mainly aimed at the triangular carrier PWM current control method, which uses a PI regulator to enhance the response speed of the current and reduce the tracking error. But in the three-phase static coordinate system, since the current command is time variable, it is impossible to realize the tracking of the current without static error. In order to overcome the above shortcomings, people transform the PI current tracking control from the three-phase stationary coordinat...

AI Technical Summary

Problems solved by technology

[0004] First, due to the real-time detection process of positive and negative sequence current components, that is, the symmetrical component decomposition process, the algorithm is complex and includes a 90° delay link, resulting in poor real-time performance;

[0005] Second, when the compensation current contains harmonic current components, there will still be AC ​​disturbance components formed by harmonic currents in the positive sequence and negative sequence SFRs, so that the true PI no static difference control cannot be realized

Images