A universal vector controller for three-phase PFC, APF, STATCOM, and grid-connected inverter

Power Factor Corrected (PFC) rectifiers, Active Power Filters (APF), STATCOMs, and grid-connected inverters are indispensable elements in Distributed Generation (DG) power systems. PFC rectifiers are essential for load side harmonic and reactive power correction, Active power filters can be used to suppress the harmonics generated by nonlinear loads or sources, STATCOMs can be used to control the power flow in the grid, while grid-connected inverters are the key elements bridging the renewable energy sources and power grid. The theory and experiments have demonstrated that One-Cycle control is capable of controlling three-phase PFCs, APFs, STATCOMs, and grid connected inverters, featuring excellent performance, simple circuitry, and low cost. While the control principles for these DG applications are the same, the previously reported implementation circuits differ from each other in some degree[1]-[5], a fact which may results in several different control chips for the three-phase DG applications. In this paper, the control key equations and circuits for One-Cycle controller controlled PFC, APF, STATCOM, and grid connected inverter are reviewed, then based on the observation a universal control circuit has been developed, further study indicates that the new control circuit can be easily integrated into one chip to control all above converters. Finally the concept was verified by experimental and simulation results.