Abstract
A multi-objective control strategy for three-phase grid-connected inverters is proposed to solve the problems of harmonics, reactive power and unbalanced three-phase current in process of pv grid-connected. ip-iq current detection method based on instantaneous reactive power theory is used to accurately detect reactive compensation current and compensating current in unbalanced power grid. Compensating signal is controlled by current loop and SVPWM pulse modulation to effectively suppress current compensation and harmonics. The principle diagram of multi-objective control of three-phase grid-connected inverters is devised and simulated on the platform of MATLAB/Simulink. It is proved that the strategy can achieve multi-objective control of grid connected inverters and raise the output power quality of the system.
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