含分布式光伏电源的配电网电压越限解决方案

Solutions of Voltage Beyond Limits in Distribution Network with Distributed Photovoltaic Generators

分析了分布式光伏电源接入配电网引起电压越限的机理。针对配电网线路阻抗比R/X较大的特点,提出光伏电源有功/无功综合控制方案,即在配电网有电压越限风险时,光伏电源实时设定其注入配电网的有功功率限值,多余的光伏电能依靠储能设备暂时存储起来,从根本上防止电压越限,同时利用逆变器剩余容量吸收感性无功功率,以进一步降低配电网电压,避免不必要的有功削减。对所述方案进行了理论分析与仿真验证。

Following an analysis of the mechanism of voltage threshold crossings in the distribution network caused by distributed photovoltaic (PV) generators, an active and reactive power integrated control strategy is proposed for the characteristics of large R/X ratios in distribution network.When the network has overvoltage risk,the active power limit will be set in real time to fundamentally prevent overvoltage with the excessive solar energy stored temporarily in the energy storage device.At the same time,the remaining capacity of the inverter will be used to absorb inductive reactive power to further reduce the voltage while avoiding unnecessary active cuts.Theoretical analysis and simulation are carried out to verify the proposed scheme.