Integração de um filtro ativo paralelo e armazenamento de energia para melhoria da qualidade de energia em sistemas de distribuição

Abstract

The increase of the renewable energy generation tends to cause a significant increase in the magnitudes of the harmonic currents and the degradation of the power quality of distribution systems distribution systems. This work presents the study and modeling of a Parallel Active Power Filter (PAPF) integrated with an Energy Storage System (ESS) aimed at improving the power quality in a typical electric power distribution system. The distribution system consists of non-linear loads, distributed generation (with intermittent characteristics) and a PAPF integrated with an ESS (battery bank) through a DC / DC converter connected to the common DC link. The objective is to perform, at the same time, the hight harmonic currents filtering (5th and 7th harmonics are the most significant components) inserted by the nonlinear loads and the smoothing of the active power demanded by the grid, eliminating the low frequency oscillating component inserted by intermittent distributed generation. The PAPF power circuit consists of a six-pulse Voltage Source Converter (VSC), whose control is implemented by measuring the instantaneous powers of the load-generation set. The battery bank is connected to the DC link of the PAPF through DC/DC converter bidirecional in current and with control based on the Active power measurement. In this way, the ESS has the objective of controlling the balance between the generated and consumed powers, making the grid Power demand approximately constant, that is, by applying the load leveling.