基于光伏逆变器调节的配电网电压控制策略

Voltage control strategy based on adjustment of PV inverters in distribution network

高渗透率光伏电站并网会导致配电系统潮流逆向和节点电压越限。因此,为保证电网的安全稳定运行,必须对光伏电站接入点的越限电压进行调整。根据光伏逆变器的容量特性和技术规范,以调整逆变器有功/无功功率为手段,提出了光伏电站逆变器电压控制策略和逆变器有功/无功功率调整的计算方法。所提电压控制策略充分利用了逆变器容量进行电压调整,具有良好的控制效果和经济性,计算简便且无需获取馈线负荷水平和分布情况。仿真分析表明,所提逆变器电压控制策略能够较好地解决光伏电站接入点的电压越限问题。

High penetration of PV(PhotoVoltaic)power stations in distribution networks may result in reverse power flow and voltage violation.Hence,in order to ensure the safe and stable operation of the power grid,it is necessary to adjust the violating voltage of the access point of PV power station.According to the capacity characteristics and technical specifications of PV inverters,a voltage control scheme using active/reactive power adjustment of PV inverters and the active/reactive power calculation approach of PV inverters are proposed.The proposed voltage control strategy that makes full use of the inverter capacity to adjust voltage is effective and economical.At the same time,the calculation is convenient and does not depend on the load level and distribution of feeders.Simulative results show that the proposed voltage control scheme effectively addresses the voltage violation problem caused by PV power stations.