Researeh On Shunt Active Power Filter

The rapid development of Power electronics technology , makes power energy transformation and application conveniently, leads to the serious power quality problems in the power system,such as harmonic currents pollution,reactive power problem,voltage fluctuation and unbalance. Active Power Filter (APF) is one kind of modem power electronics equipment which can compensate harmonic current and reactive power. It has much more advantages than other passive filters. This paper chooses three phases hunt APF to study. The thesis builds simulation model of APF using Matlab software,and focuses on the harmonic current detection ,current tracking control strategy and DC voltage controlThe thesis researches harmonic current detection of p ? q and i p ? iq based on instantaneous reavtive power theory. the thesis proposes four kinds of current tracking control methods including periodic sampling control,triangle wave comparison control,hysteresis current comparison control and hysteresis control based on space vector.The thesis researches the selection method of parameters in the main circuit of APF. It deduces the selection methods of voltage and capacitance in DC side through theoretical analysis.Finally,the thesis proposes the PI control method about DC side voltage current detection method. The simulation results prove its feasibility.