Simulation On One Of The Parallel Hybrid Active Power Filter

Nowadays, harmonics contamination become more and more severe problems in power system because of the ever-increasing nonlinear loads, Such as converter, variable speed drivers, arc furnace, etc. There is a great market demand to utilize the active power filters (APF) to reduce the harmonics of the power system and improve the power quality in china. Therefore it is worthy of research how to correctly choose the control arithmetic and design the parameters of APF to better its performances at the time of reducing its cost. A parallel hybrid APF is proposed in this paper, Based on preventing harmonic currents. It consists of Passive Filter and APF. Passive Filter compensates a majority of harmonic currents. Function of APF only compensate a few harmonic current and prevent harmonic resonance. The power of lever of APF is very small because of avoiding to basic voltage. A general description of the development of harmonic suppression in power system is given in this paper. The principle and structure of APF are firstly expatiated. Then groundwork of deep analysis of theory of Instantaneous reactive power detecting methods diversified schemes for high frequency harmonic and reactive current is presented and the diagrams of actualization of all types are put forward. Besides the signal processing section structure and principle of anther key part of APF ----PWM rectifier is discussed; model of the nonlinear control system is deduced and constructed in SIMLINK environment. At last the parallel hybrid APF is simulated in SIMULINK environment of MATLAB software. From simulation results APF can eliminate harmonic and compensate reactive current effectively.