光伏电源接入对配电网电压的影响研究

Study on The Influence of Photovoltaic Power Generation Connected to Distribution Network on Voltage

针对光伏电源接入可能导致配电网电压失稳、影响电力系统的安全稳定运行的问题,通过潮流计算分析网络功率流动情况,并结合光伏电源接入后的配电网的结构特点,对配电网电压的变化情况进行详细的研究,最后利用仿真系统验证了分布式光伏电源并网后会使线路电压分布发生变化,节点电压会因为光伏有功的注入而抬高,电压产生波动,甚至发生越限。

Aiming at the problem that photovoltaic power supply access may lead to voltage instability of distribution network and affect the safe and stable operation of power system,this paper analyzes the power flow of network through power flow calculation,and makes a detailed study on the change of distribution network voltage in combination with the structural characteristics of distribution network after photovoltaic power supply access.Finally,the simulation system is used to verify that the distribution of line voltage will change after the grid connection of distributed photovoltaic power supply,The node voltage will rise due to the injection of photovoltaic active power,and the voltage will fluctuate or even exceed the limit.