A Novel DC Side Series Active Power Filter

Results of the analysis on compensation characteristics of voltage type harmonic sources show that traditional shunt active power filter (APF) is deficient for the compensation of voltage type harmonic sources and a novel DC side series APF is proposed. Comparing with traditional AC side series APF, the proposed DC side series APF is in series with the DC side of rectifier bridge, it makes the circuit structure simplified and the number of active switches reduced, thus the proposed scheme possesses evident technical superiority in the elimination of voltage type harmonic sources. The basic principle and circuit topology of DC side series APF are analyzed; the corresponding control equations are derived; the criteria for the design and selection of principal parameters for main circuit, i.e., the filter inductor and energy storage capacitor, are given to provide theoretical basis for rational design of DC side series APF. Simulation results validate the correctness and reliability of the theoretical analysis.