集群光伏电站频率主动支撑自校正控制方法  

Self-tuning Control Method of Active Frequency Support of Clustering Photovoltaic Power Plants

作　　者：刘刚 陈海东 孙睿哲 彭佩佩 LIU Gang;CHEN Haidong;SUN Ruizhe;PENG Peipei(Dispatching&Control Center,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750001,China;School of Electrical Engineering,Southeast University,Nanjing 210096,China;China Electric Power Research Institute,Nanjing 210037,China)

机构地区：[1]国网宁夏电力有限公司调度控制中心,宁夏银川750001 [2]东南大学电气工程学院,江苏南京210096 [3]中国电力科学研究院有限公司,江苏南京210037

出　　处：《中国电力》2022年第9期156-162,共7页Electric Power

基　　金：国家重点研发计划资助项目(可再生能源与火力发电耦合集成与灵活运行控制技术,2019YFB1505400)。

摘　　要：现有光伏电站通过检测频率变化,采用下垂控制调节出力抑制源侧随机无规则出力波动,调频过程存在时间滞后性。基于自校正控制,提出一种可平滑光伏秒级出力波动的光伏电站频率主动支撑控制策略,根据受扰光伏电站光照波动情况,通过前馈补偿主动校正自身有功参考值,重新自适应分配各光伏电站有功给定值,实现在频率明显变化前主动补偿受扰电站的出力波动。基于Matlab/Simulink搭建仿真算例,仿真结果表明:相较下垂控制,自校正控制在扰动下可将频率最低点提高约0.04 Hz,并使得平均频率变化率降低约26.06%,有效提升了系统频率性能。As existing photovoltaic power plants implement droop control to adjust output and thereby suppress random and irregular output fluctuations on the supply side after detecting frequency changes, a time lag occurs in the frequency modulation process. On the basis of self-tuning control, this paper proposes a control strategy of active frequency support that can smooth second-level output fluctuations of photovoltaic power for photovoltaic power plants. According to the light fluctuation at the disturbed photovoltaic power plant, the reference active power is automatically corrected through feedforward compensation, and the active power setpoint of each photovoltaic power plant is redistributed adaptively. The output fluctuation at the disturbed power plant is thereby actively compensated before the frequency changes significantly. A simulation example is built with Matlab/Simulink. The simulation results show that compared with droop control, the proposed self-tuning control effectively improves the frequency performance of the system by elevating the lowest frequency point by about 0.04 Hz under disturbances and reducing the average frequency change rate by about 26.06%.

关 键 词：光伏电站 自校正控制 出力平滑 主动支撑 频率 

分 类 号：TM615[电气工程—电力系统及自动化]