For improving the output power quality of the grid-connected inverters at unbalanced grid voltage

a kind of optimization strategy based on BP neural network with purpose of adaptively adjusting the current command value and achieving multiple control objectives and coordination of the grid-connected inverter is proposed. Firstly

the adaptive reduced-order generalized integrator is used to achieve the accurate extraction of the positive and negative sequence of the grid voltage and enhance the robustness of the control system.Then

one current expression which can achieve multiple control objectives by way of changing the parameters is set up in accordance with the grid-connect command value obtained by single control objective calculation.The current expression parameters are optimized with combination of BP neutral network so to achieve coordination between multiple control objectives and improve the output power quality. Finally

simulation verification is performed in Matlab/Simulink. Both correctness and effectiveness of the control strategy proposed are shown by the simulation result.