57. Uniform Control of Single-Phase Two-Stage Grid-Connected Generation and Active Power Filter

In this paper a single-phase active power filter based on a two-stage photovoltaic grid-connected system is presented, which can not only inject PV power into gird but also can always act as an active power filter to compensate the load harmonics current and reactive power. Control method of a double loop of the inverter DC voltage and current control of grid is used. When local nonlinear load is changed, DC voltage can be kept stable. Simulation results of both conditions that harmonics exist or do not exist show that the designed inverter is stable and practicable. Single-phase harmonic detection method does not need coordinate transformation and the algorithm is simple. The feasibility of control strategy and system topology is verified by the simulation and experimental results.