Anti-interference tracking control system and control method thereof for compensating current of active power filter

Abstract

The invention provides an anti-interference tracking control system and a control method thereof for the compensating current of an active power filter, and belongs to the field of inverter current tracking and control. The system comprises a voltage reference circuit, a D / A conversion circuit, an A / D conversion circuit, a synchronous sampling and holding circuit, a network-side voltage zero-crossing detection circuit, a gate driving pulse circuit, a current detection signal conditioning circuit, a DSP control unit and a storage unit. The system integrates a high-performance digital signal processor with the advanced linear self-disturbance rejection control algorithm, so that the control precision and the control effect are greatly improved. The rapid real-time tracking of the compensating current on the directive current can be realized. According to the technical scheme of the invention, the following five technical effects are realized. Firstly, the system is simple in hardware structure and convenient to operate. Secondly, the DSP is powerful in digital signal processing capability, fast in execution speed, and good in real-time performance. Thirdly, the advanced linear self-disturbance rejection control strategy enables the tracking control of the compensating current to be more accurate and more accurate, so that the effect is better. Fourthly, the system is better in anti-interference performance. Fifthly, the active filtering performance is improved.

Description

technical field [0001] The invention relates to an active power filter compensation current control strategy and belongs to the field of inverter current tracking control. It is a tracking control system of active power filter compensation current based on LADRC (linear active disturbance rejection control, LADRC-linear active disturbance rejection controller). Background technique [0002] Harmonic pollution caused by the large-scale application of high-power nonlinear loads seriously affects the stability and reliability of power grid operation. Traditional passive filters can no longer meet people's requirements for power supply reliability and high power quality. As a dynamic harmonic control device, the active power filter perfectly solves various problems in the operation of passive filters, and has received extensive attention in recent years. The parallel hybrid active power filter uses the ingenuity of its own structure to integrate the advantages of passive filte...

AI Technical Summary

Problems solved by technology

It is difficult to achieve better accuracy and speed with traditional PID controllers, and with the further improvement of control quality, the defects of traditional PID controllers are further amplified

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