Integration of a Shunt Active Filter and Energy Storage to Energy Quality Improvement in Distributed Power Systems

The increase of renewable energy generation has caused a significant increase of current harmonics and degradation of the energy quality in distribution systems. This paper presents the study and modeling of a Shunt Active Filter (SAPF) integrated with an Energy Storage System (ESS) applied in energy quality improvement. The distribution system consists of non-linear loads, wind generation and a SAPF integrated to an ESS (batteries bank) through the DC link. The objective is to perform, at the same time, the harmonic currents filtering and the low frequency oscillating power elimination inserted by the loads-generation group. The SAPF power circuit consists of a six-pulse Voltage Source Converter (VSC) and the control implemented from the instantaneous powers measurement of the load-generation group. The batteries bank is connected to the SAPF DC link through a bidirectional DC/DC converter and its control is implemented by the grid active power measuring. In this way, the ESS control has the objective of applying load leveling to the loads and distributed generation set.