基于逆变器自适应功率控制的光伏并网点治理策略

为改善分布式电源接入和电力电子电源/负荷设备引起的光伏并网点电压越限、谐波问题,提出了一种基于逆变器自适应功率控制的治理策略.首先,将并网点电压越限与谐波问题同时进行考虑,提出了逆变器容量分配策略.然后,针对电压越限问题,考虑电压越上限与电压越下限时削减有功对并网点电压影响的差异,提出了逆变器自适应功率控制策略,在电压...

Mitigation Strategy at Photovoltaic Grid-connected Point Based on Adaptive Power Control of Inverter

To solve the problems of voltage violation and harmonics at photovoltaic(PV)grid-connected points caused by the integration of distributed generations and power electronic source/load equipment,a mitigation strategy based on the adaptive power control of inverter is proposed.First,considering the problems of voltage violation and harmonics at the grid-connected point simultaneously,an inverter capacity allocation strategy is formulated.Second,aimed at the problem of voltage violation,the difference in the influence of active power reduction on the voltage at the grid-connect?ed point when voltage exceeds the upper or lower limit is taken into account,and an adaptive power control strategy for inverter is put forward,which judges the effect of reducing active power and increasing reactive power when voltage ex?ceeds the lower limit,thus avoiding the further voltage drop due to the excessive active power reduction.Finally,aimed at active power reduction,an active power control strategy for PV inverter is proposed,which considers the change in open circuit voltage when irradiance drops rapidly,thereby making the PV operate on the right side of the maximum power point.Simulation results show that the proposed strategy can effectively mitigate voltage violation and harmonics at the PV grid-connected point.