基于RTDS储能对光伏发电PCC电压影响研究

Research on the Impacts of RTDS Based Storage on PCC Voltage of PV

大容量光伏发电集中并网对配电网特别是PCC电压造成一定影响,光伏电站配置适当容量的储能系统,可有效降低光伏电站PCC电压波动。本文基于RTDS建立了光储并网发电系统模型,仿真光照强度、环境温度以及邻近负荷变化,分析了PCC有无储能系统两种情况下的功率、电压有效值变化。根据电压有效值标准差数据,定量计算PCC电压波动降低幅度。仿真结果表明,储能系统可有效抑制光伏电站PCC的电压波动及逆功率运行,提高PCC电能质量。光伏出力越大,储能系统抑制PCC电压波动效果越明显。本文成果可为降低新能源PCC电压波动及大规模光储系统发展提供借鉴。

Power grid connected with large capacity photovoltaic（PV）will influence distribution network and PCC（point of common coupling）voltage fluctuation,so PV power station equipped with appropriate capacity of energy storage system can reduce PCC voltage fluctuation of PV power station.In the paper,the RTDS（real time digital simulator）model of power generation system connected with energy storage and PV system is built,through which the cases on varying light intensity,different ambient temperature and the change of adjacent load are simulated,and the comparison of varying effective value of power and voltage is analyzed under such conditions as power system with/without energy storage.According to the standard deviation of the voltage effective value,quantitative study on the reduction of PCC voltage fluctuations is carried out.The simulation results show that the energy storage system can effectively restrain the voltage fluctuation of PV power system and reverse power operation,and can improve the power quality.In addition,there is larger PV power output,and effect of storage system on restraining PCC voltage fluctuation is more obvious.The study results can provide reference for reducing PCC voltage fluctuations of new energy sources and the development of large scale power system with PV and energy storage.