Research On Shunt Active Filter And Reactive Power Compensation

The wide use of power electronic equipment makes harmonic problem deteriorated increasingly, and harmonic becomes the primary factor influencing power quality. Active power filter is considered as the most effective method to restrict harmonic. Research and application are widely studied. Firstly the background, development and future prospect of active power filter is described in detail. Then, the thesis introduces the classifications and topology structure of the active power filters. Especially further analyses are made on the operational principle of the shunt active power filter. The thesis introduces two kinds of real time harmonic and reactive current detection methods, which are base on instantaneous reactive power theory. A new harmonic harmonic and reactive current detection method and a harmonic current detection method base on bandpass filter are introduced in this thesis. Shunt active power filter's control strategy including compensatory current control and DC voltage control is analyzed in detail. Compensatory current control adopts triangle wave compare control, and DC voltage control adopts PI closed loop control. The thesis introduces shunt active power filter system 's hardware and software design with TMS320LF2407 DSP. Hardware and software's structure and function are described in detail. The thesis makes the simulation for shunt active power filter system, and many experiments are done on the experimental equipment of shunt active power filter. The proposed harmonic and reactive current detection method and the control strategy of shunt active power filter are tested. And satisfactory result is drawn. The simulation results and experiment results verify validity and effectiveness of the current detection method and the control strategy.