Generalized Active Power Filter Combined with Battery Energy Storage System.

GAPF (Generalized Active Power Filter) is a non-tracking filter. Through outputting fundamental positive sequence voltages synchronized with the system it can achieve reactive power compensation, harmonic suppression, negative sequence filtering and voltage stabling effectively without the need of load current detection. In this paper a GAPF combined with Battery Energy Storage System (BESS) is proposed which can enlarge operation range, improve performance, extend functionality and realize four-quadrant compensation to the system. The topology and operating principle of GAPF/BESS are discussed in detail. Two control methods are presented. The correctness of theoretical analysis and the feasibility of control methods are verified by simulation and experimental results. [ABSTRACT FROM AUTHOR]