Battery storage system with active filtering function based on the conservative power theory for wind generators

This paper presents a three-phase Battery Storage System (BSS) with active filtering function. The primary function of the BSS is to compensate power fluctuation from a Wind Generator (WG) system. The BSS activates the active filter function in specific moments during its operation. The BSS decision-algorithm and the control strategy are described. The Conservative Power Theory (CPT) is used to compute the active output power of the BSS and the WG System. The WG is connected to a 12.4 kV grid (phase-to-ground) while the BSS is connected to this grid through a 60Hz-transformer. The active filtering function is limited to mitigate the 5th and 7th harmonics from nonlinear loads to avoid large increasing on the RMS current of the BSS transformer. The BSS can perform its primary function simultaneously with active filtering. Simulation results show the efficacy of the BSS to operate in combination to a WG system.