Study on Current Decoupling Method of Three-Phase Grid-Connected Inverter

According to the state feedback decoupling theory of modern control theory, a current decoupling method combined with pole placement is proposed for the topology of three-phase grid-connected control system based on voltage orientation. This method is simple and practical and dq axis current decoupling is realized. The simulation model of three-phase grid-connected control system is established by using Matlab/Simulink. Then the hardware experiment platform with DSP as the control core is designed. The control software is programmed in Q15 format fixed-point realization method and assembler language. The simulation and experimental results prove the validity of current decoupling method and show that control system has good dynamic and static performance.