Advanced Active Filtering in a Single Phase High Frequency AC Microgrid

In this paper a single phase high frequency AC (HFAC) microgrid is presented as an exciting step towards integrating renewable energy sources in a distributed generation system. A very important task in the microgrid is to control the power flow between the microgrid and the local grid, which can be accomplished by using an active filtering solution called universal active power line conditioner (UPLC). Besides, for optimum HFAC bus utilization, it is extremely important to compensate for reactive power, load current harmonics resulted from non-linear loads, and voltage distortions resulting from the source and/or converter non-linearity. A unified power quality conditioner (UPQC), which integrates shunt and series active filters, is a power electronic solution to accomplish all these functions. The controllers for both the UPQC and UPLC are based on the instantaneous single phase p-q theory and the results obtained show that the successful implementation of HFAC microgrid with adequate power flow and power quality control ensuring the improved system utilization