含分布式光伏电源的配电网电压稳定性分析

Analysis of Distributed Photovoltaic Generators on Voltage Stability of Distribution Network

运用电力系统分析工具箱PSAT建立分布式光伏电源接入配电网系统的模型,研究分布式光伏电源接入对配电网电压稳定性的影响.研究结果显示,分布式光伏电源的接入提高了系统的最大负荷参数,增大了静态电压稳定域;存在使系统静态电压稳定域达到最大的光伏渗透率;光照强度突降时,部分节点电压跌落至电压稳定运行限定值以下;光强突降使光伏电源出力为0时,在并网点投入并联电容补偿装置能够维持所有节点电压在电压稳定运行范围之内.

This article uses power system analysis toolbox PSAT to establish a model for distributed photovoltaic （PV） generators in distribution network systems, aimed at studying the effects of connection of photovoltaic generators on the voltage stability of distributed PV generators in distribution grids. The result shows that distributed PV generators can improve the maximum power parameter of load operation, increase the static voltage stability region; there is PV penetration which helps to maximize the static voltage stability region; light intensity decreasing suddenly causes part of the node’s voltage to drop to the limited value of stable operation or less; the voltage of some nodes will fall below the limit point for voltage stable operation; when the PV power output is zero caused by sudden light intensity decrease, settling compensation equipment in parallel can maintain the voltage of all nodes within the range of voltage stable operation.