Research On 30kVA Three-phase Three-line Shunt Active Power Filter

With the recent power electronic devices in the power system of heavy use, the grid will produce harmonics will affect the use of various electrical appliances. We are now focused on the direction of research lies in how the weakening influence of harmonics. In various suppression mode, the use of active power filter(APF: Active Power Filter) is the most widely used approach.This article describes some of the methods of harmonic suppression, particularly focusing on the research profile of active power filter stage, the future trend. Thus APF passive power filter compares each such basic principles, common classification, advantages and disadvantages, and so on.This paper describes an example shunt APF APF works, uses a three-phase three-wire connection, the establishment of the mathematical model, and analyzes the development of three-phase three-wire shunt active power filter technology in several important research, namely: harmonic current detection; compensation current control; DC voltage control. Harmonic current detecting section focuses on the instantaneous reactive theory and based on wavelet transform harmonic current detection method using SIMULINK simulation for its made. Control system is a key determinant of active power filter performance, the compensation current control method of the apparatus used in this paper: space vector PWM modulation method.Finally, this paper designed a prototype platform for a more detailed description. Introduced from both the main circuit and control system hardware circuit, including parts of the control module schematics and operating principle. Finally, the platform has been part of the research for discrete functional modules, reactive power compensation control, the part of the experiment waveform with the experimental data has been verified by the working principle and control strategies discussed herein above.