Dc voltage balance control method of grid-connected PV inverter
The conventional inverter DC voltage balance control model is set as an independent form,which has more control restrictions,resulting in increased balance control voltage deviation.In order to solve this problem,this paper proposes the design and research of DC voltage balance control method for grid-connected PV inverters.According to the current test requirements,the average power is calculated first,the split-phase control structure is constructed,and then the multi-objective mode is adopted to break the limitations of traditional balance control,and the DC voltage balance control model of the multi-objective inverter is designed.Finally,the bidirectional switching balance discrimination is adopted to achieve control processing.The test results show that:for the selected three circuits,when injecting zero sequence voltage and negative sequence voltage respectively,the measured balance control voltage deviation is controlled below 1.5,indicating that combined with the actual voltage measurement balance control requirements,the designed DC side voltage balance control method of PV grid-connected inverter is more efficient,and the control effect is significantly improved.
photovoltaic power generationinverterdc side voltagevoltage adjustmentbalance controlcontrol method
万方数据
维普
