Adaptive DC voltage control for single-phase hybrid filter with PV integration capability

The operational voltage of the hybrid power filter (HPF) is much lower than an active power filter (APF) when reactive power of inductive loads is compensated. The active power transfer capability of the HPF is utilized to achieve PV generator integration in this paper. The proposed system is a low cost solution for power quality conditioning and PV integration in modern buildings. The low dc voltage reduces the energy stored in the dc capacitor and is safer for building-integrated PV systems. In order to reduce switching loss and switching noises, an adaptive dc voltage controller is proposed. The dc-link voltage as well as the power flow controllable range of the HPF is adaptively changed according to different loading and PV generator output. Simulation and experimental results are provided to show the effectiveness of the adaptive dc voltage control method.