High-capacity hybrid active power filter for the power substation

Abstract

Non-linear loads, such as diode, thyristor converters and arc furnaces are typical sources of harmonic currents. A capacitor clamped voltage source inverter for high-capacity hybrid active power filter (HHAPF) to compensate harmonics and reactive power. If the utility voltage is distorted, APF allows similar level of distortion in the compensated source current. The HHAPF which is composed of series resonators injection APF and passive filter (PF) by parallel hybrid can make static compensation of reactive power by capacitor and it can eliminate harmonics by the co-function of active filter and passive filter. The serial resonant LC network resonance occurs in the fundamental frequency, its fundamental current impedance is approximate 0, the fundamental current will all flow to this network, but not to flow into the coupling transformer and the inversion. Practice shows that the HHAPF has good filter effect and certain capacity of reactive power compensation. © 2011 Springer-Verlag Berlin Heidelberg.