协调AGC与PFR的水电机组有功/频率联合控制策略及应用  

Active Power and Frequency Combined Control Strategy and Its Application of Hydropower Units for AGC and PFR Coordination

作　　者：王官宏 高剑[2] 汤凡 李甘[2] 李莹 艾东平 李文锋 WANG Guanhong;GAO Jian;TANG Fan;LI Gan;LI Ying;AI Dongping;LI Wenfeng(China Electric Power Research Institute,Haidian District,Beijing 100192,China;State Grid Sichuan Electric Power Company,Chengdu 610041,Sichuan Province,China;Southwest Branch of State Grid Corporation of China,Chengdu 610041,Sichuan Province,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192 [2]国网四川省电力公司,四川省成都市610041 [3]国家电网公司西南分部,四川省成都市610041

出　　处：《电网技术》2023年第5期1762-1769,共8页Power System Technology

基　　金：国家电网有限公司总部管理科技项目(5108-202218280A-2-282-XG):“全功率变速抽水蓄能与新能源系统联合运行控制技术研究及应用”。

摘　　要：电网频率在系统扰动发生后将持续波动,机组一次调频(primary frequency control, PFR)与自动发电控制(automatic generation control,AGC)将先后动作,AGC与PFR作为系统频率调节的主要手段,二者协调动作对频率稳定至关重要。近年来电网实际扰动和水电机组现场试验多次出现了机组AGC与PFR不协调的现象,AGC反向调节PFR,或者PFR动作闭锁AGC(含闭锁反向AGC)调节的现象十分普遍。基于系统计算分析及机组调试发现的问题,提出了一种多模式适应的监控系统有功/频率联合控制系统模型结构,通过在监控系统有功控制结构上设计调频修正逻辑,可实现当频率变化时实时计算调频功率目标值以动态修正监控系统功率给定,实现AGC和PFR的指令叠加。同时为提高监控系统有功/频率联合控制的适应性,在监控系统新增的调频修正逻辑可设置2套独立参数,以匹配调速系统大/小网控制模式。该策略已在白鹤滩等20余台水电机组示范应用,从机组投产至今保持安全稳定运行,解决了水电机组PFR与AGC协调难题。在高占比水电系统及水电高占比新型电力系统中,该策略可以保障水电机组稳定、足量贡献一次调频和二次调频功率,对维护系统频率稳定具有重要意义。After a system disturbance,the power grid frequency continues to fluctuate,and the primary frequency control(PFR)and the AGC of the power units act successively.As the main means of the system frequency regulation,the coordinated action of the PFR and the AGC is important for the system frequency stability.In recent years,the uncoordinated actions between the AGC and the PFR of the power units have occurred frequently in the actual disturbances of the power grid and the field tests of the hydropower units.The AGC reversely regulates the PFR,or the PFR locks the AGC(including locking the reverse AGC command)regulation are very common.Based on the detailed power system calculation and a large number of engineering commissioning and test summaries,this paper proposes a multi-mode adaptive active power/frequency combined control system model of the hydropower unit supervisory control system.By designing the frequency correction modulation logic on the active control structure,when the frequency changes,the target value of the frequency modulation power is calculated in real time to dynamically correct the given power of the supervisory control system,so as to realize the direct superposition of the AGC and the PFR regulation commands.At the same time,in order to improve the adaptability of the active/frequency combined control,2 sets of independent parameters can be set in the newly added frequency correction modulation logic to match the large/small network control mode of the governing system.This strategy has been demonstrated and applied in over 20 hydropower units,which proves to have been operating safely and stably since the installation and successfully solve the incoordination between the AGC and the PFR of the hydropower units.In the power system with a high proportion of hydropower,this strategy guarantees the stable and complete contribution of the hydro-power to the primary and secondary frequency regulations,valuable to improve the frequency stability of the power system.

关 键 词：有功/频率联合控制 自动发电控制 一次调频 水电机组 频率稳定 

分 类 号：TM21[一般工业技术—材料科学与工程]