曹奇,张维,郭上华.基于PSCAD的电网电压不平衡情况下光伏并网逆变器控制策略的研究[J].电测与仪表,2014,51(21):. CAO Qi,ZHANG Wei,GUO Shanghua.Research on Control Strategies of PV Grid-connected Inverter under Unbalanced Voltage Conditions Based on PSCAD[J].Electrical Measurement & Instrumentation,2014,51(21):.
基于PSCAD的电网电压不平衡情况下光伏并网逆变器控制策略的研究
Research on Control Strategies of PV Grid-connected Inverter under Unbalanced Voltage Conditions Based on PSCAD
In order to ensure the symmetrical output current of PV grid-connected inverter under Unbalanced Voltage Condition,in this paper,the mathematic model of PV grid-connected inverter under unbalanced voltage condition is given,and the disadvantages of conventional PI strategy in the synchronous rotating reference system are discussed.A improved dq-PI Control Strategy is proposed based on the research of dual dq-PI controller in the synchronous rotating positive/negative reference system.Compared with the conventional PI control strategy and improved dq-PI control strategy based on PSCAD,the simulation results verify that the proposed strategy could keep current balance of PV inverters.
