含智能软开关的主动配电网3阶段鲁棒电压控制方法

Three-stage Robust Voltage Control Method for Active Distribution Network with Soft Open Points

为了解决大规模光伏接入主动配电网后引起的节点电压越限和波动的问题,提出了一种含智能软开关(soft open point,SOP)的主动配电网3阶段鲁棒电压控制(three-stage robust voltage control,TSRVC)方法。该方法的第1阶段考虑了长时间尺度下光伏出力和负荷的不确定性,对有载调压变压器的分接头位置和电容器组的投切组数进行了鲁棒优化;第2阶段根据光伏和负荷的短期功率预测结果,对各个SOP的有功功率和其电压-无功下垂曲线进行了优化;第3阶段根据节点电压的实时测量值和上一阶段优化得到的电压-无功下垂曲线,动态地调整各个SOP的实时无功功率输出。最后,在改进的IEEE 33节点算例上进行了仿真,结果表明:所提3阶段鲁棒电压控制方法可以充分应对光伏出力和负荷的不确定性,将节点电压有效控制在理想范围内的同时,能够显著降低系统的运行损耗,实现含高渗透率光伏配电网的电压控制。

A three-stage robust voltage control(TSRVC) method with soft open point(SOP) is proposed to solve the problem of voltage violations and fluctuations in the active distribution network(ADN) with high penetration photovoltaic(PV). At the first stage, the uncertainties of PV output and load are considered on a long time scale. The tap position of OLTC and the set number of CBs are optimized robustly. At the second stage, the active power of each SOP is optimized on a short time scale based on the short-term prediction of PV and load, and the voltage-var control curves are optimized. At the third stage, the local reactive power output of each SOP is dynamically adjusted according to the real-time measured voltage and the voltage-var control curve on the minute scale. Finally, the proposed method is simulated on the improved IEEE 33 node system. The results show that the proposed TSRVC method can be adopted to fully deal with the uncertainty of PV output and load, effectively control the node voltage in an ideal range, and significantly reduce the power loss of the system, realizing the voltage control of ADN with high penetration PV.