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D-Q axis decoupling control of LCCL type photovoltaic grid inverter

For the existence of harmonics in the grid voltage, a high-order harmonics may occur in the grid, which will affect the power quality of grid network system. In this paper, to avoid the adverse effect on the grid current by the high-order harmonics in the d-q axis current decoupling component, the d-q axis referring current is used to replace the d-q axis current decoupling component, hence the waveform quality of the grid current is improved. Furthermore, it is analyzed the influence of passive damping control method of LCCL type filter on the grid connected power loss. Simulation results show that the proposed decoupling control method can improve both the quality of grid connected power and the system efficiency, thus the fast dynamic response of grid current and high waveform quality are achieved.