光伏接入对配电网电压分布的影响

Influence of PV integration on distribution network voltage

近年来,宁夏地区光伏发电大规模接入配电网,导致配电网的潮流分布发生变化,母线节点电压也随之改变。为进一步分析光伏接入对配电网电压分布的影响,通过光伏并网后电压波动原理分析和仿真实验,系统地研究光伏系统的不同接入方式、不同接入容量和接入位置等因素对配电网电压分布的影响。分析结果表明,在有功输出过大的光伏系统接入配电网时出现配电网末端电压越限问题,光伏系统渗透率达到50%左右,对35 kV配电网节点电压的支撑效果最好,而光伏接入位置靠近末端时对系统电压的影响更为显著。

In recent years,the large-scale integration of photovoltaic(PV)power generation into the distribution network in Ningxia has altered the network′s power flow and the bus node voltages.In order to further examine the impacts of PV integration on the voltage distribution in the distribution network,this article analyzes the voltage fluctuation principles after PV integration and conducts simulation experiments.It finds out that various PV system integration factors-including the method,capacity,and integration location-have impacted the network′s voltage distribution.The integration of the PV system with excessive active power output has resulted in voltage limit exceedances at the end of the distribution network.It is found that the penetration rate of the PV system reaches about 50%,offering optimal support for the node voltage of a 35 kV distribution network.Moreover,the closer the PV integration location is to the network′s end,the greater its impact on the system voltage.