SOFT-SWITCHING ACTIVE POWER FILTER FOR REDUCING\r\nHARMONIC CURRENT IN SYSTEM WITH NON-LINIER LOAD

This paper presents the design of an active power filter (APF) with soft switching. APF used for compensating the power factor harmonic and harmonic current, but usually switching losses is increased when APF operates at high frequency. The switching losses can be reduced by soft switching technique. The proposed soft switching losses can be reduced by soft switching technique. The proposed soft switching APF includes the combination of the boost converter with auxiliary resonant. By using an auxiliary resonant circuit, switching losses of APF is reduced and the circuit forces voltage or current to zero for the duration switching. The advantages of proposed design improve efficiency, reduced voltage stress, and greatly reduced harmonic current of voltage source. The proposed soft switching APF rated at 500 W and operated at 10 kHz. It can achieve a sinusoidal line current and near unity power factor. In order to verify the proposed design a simulation model using Matlab/ Simulink was developed. The results show that the proposed APF can significantly reduce the total harmonic distortion (THD) and improve the power factor.
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