Power quality assessment in electrical utilities including distributed generation unit hybrid filters under non-ideal source voltage

摘要

This paper deals with a hybrid compensation system in electrical utility including a distributed generation (DG) unit under non-ideal source voltages condition. The DG unit consists of a Solid Oxide Fuel Cell (SOFC) as active power source and a three-phase full-bridge DC-AC inverter for power conversion. DG unit is controlled to deliver balanced and sinusoidal current in phase with fundamental positive sequence of source voltage with a new control strategy. The hybrid filter consists of a passive filter (PF) that is connected in series with load and a parallel active filter (PAF). The PF is tuned at fundamental frequency so it eliminates load harmonic currents. Finally PAF compensates for load unbalances and reactive power. Each of the mentioned parts will be described separately and also the system operation will be verified under unbalance and harmonic polluted source condition. The proposed system is simulated using Matlab software. The simulation results show that the proposed system has the satisfying operation.