Direct power active disturbance rejection control method for three-phase voltage source PWM rectifier

Abstract

The invention discloses a direct power active disturbance rejection control method for a three-phase voltage source PWM rectifier. The method includes the following steps that the input instantaneous active power and the input instantaneous reactive power of the three-phase voltage source PWM rectifier are obtained; the instantaneous active power and the instantaneous reactive power serve as input of an expanded state observer, and based on the real-time observation value, the active power instruction value and the reactive power instruction value of system disturbance quantity, active power control quantity and reactive power control quantity can be respectively obtained according to the active power control rate and the reactive power control rate; according to the active power control quantity, the reactive power control quantity and a network voltage sampling value, the alpha-beta axis component instruction value of the input voltage on the alternating-current side of the rectifier is calculated; according to the alpha-beta axis component instruction value of the input voltage on the alternating-current side of the rectifier, a rectifier switching signal is obtained through a PWM module. Through the method, direct power control over the rectifier is achieved in a static coordinate system, no phase-locked rings are needed, and phase information of network voltage does not need to be detected in real time.

Description

technical field [0001] The invention relates to the field of three-phase voltage-type PWM rectifiers, in particular to a direct power active disturbance rejection control method for three-phase voltage-type PWM rectifiers. The method is suitable for use in three-phase AC-DC power converters. Background technique [0002] With the development of modern power electronic technology, microelectronic technology and computer technology, power conversion devices based on PWM technology have attracted extensive attention. Compared with the usual diode uncontrolled rectifier, the three-phase voltage PWM rectifier has the characteristics of low current harmonic distortion rate, bidirectional flow of power, and unit power factor can be obtained, which eliminates the large harmonic content and low power in the traditional rectifier circuit. Problems such as low factor and non-feedback of energy can be used to realize reactive power compensation, suppress grid harmonics, weaken the impac...

AI Technical Summary

Problems solved by technology

Factors such as system parameter drift and inaccurate modeling will affect the quality of feedforward compensation and the effect of decoupling control, reducing the stability of system operation

In addition, the cumbersome rotation coordinate transformation increases the computational load of the rectifier control system, which restricts the further improvement of the rectifier control performance to a certain extent.

Images