摘要
随着我国电网结构的持续优化调整,电力系统的频率特性也随之变化。水电高占比电力系统中频率问题日渐突出,系统扰动后电网频率面临恢复速度慢、振荡阻尼低的双重考验,为了更准确的分析系统频率的调节特性,需要全面研究机组有功/频率控制系统的动态特性。水电机组的有功/频率调节是由监控系统的就地控制单元(localcontrolunit,LCU)有功控制和调速系统共同实现,当前系统机电暂态仿真中,对调速系统一次调频调节特性已准确掌握,但对于调速系统上一级的机组监控系统LCU对频率特性的影响较少考虑。该文基于西南电网主力水电机组有功联合控制运行现状的充分调研,建立了LCU功率闭环控制仿真模型,并实测了关键参数,从机理上分析了考虑监控系统LCU的有功联合控制对系统频率振荡阻尼的影响,在搭建的仿真算例中分析了LCU有功控制对频率动态阻尼水平和频率恢复水平的影响。
With the continuous optimization and adjustment of power grid structure in China,the frequency characteristics of power system also change.The frequency problem of hydropower high proportion power system is becoming increasingly prominent.After the system disturbance,the grid frequency faces the double test of slow recovery speed and low oscillation damping.In order to more accurately analyze the regulation characteristics of system frequency,it is necessary to comprehensively study the dynamic characteristics of the unit active power/frequency control system.The active power/frequency regulation of hydropower units is realized by the local control unit(LCU)active power control of the monitoring system and the speed regulation system.The primary frequency regulation characteristics of the speed regulation system have been accurately mastered in the current electromechanical transient simulation of the system,but the influence of LCU of the unit monitoring system on the frequency characteristics is less considered.In this paper,based on the full investigation of the operation status of active power joint control of main hydropower units in southwest power grid,the simulation model of LCU power closed-loop control was established,and the key parameters were measured.The influence of LCU active power joint control of monitoring system on frequency oscillation damping was analyzed from the mechanism.In the simulation example,the influence of LCU active power control on frequency dynamic damping level and frequency recovery level was analyzed.
作者
李莹
王官宏
艾东平
魏巍
李甘
吴杰
LI Ying;WANG Guanhong;AI Dongping;WEI Wei;LI Gan;WU Jie(China Electric Power Research Institute,Haidian District,Beijing 100192,China;State Grid Sichuan Electric Power Company,Chengdu 610041,Sichuan Province,China;State Grid Xizang Electric Power Company,Lasha 850000,Tibet Autonomous Region,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第S01期167-177,共11页
Proceedings of the CSEE
关键词
水电机组
就地控制单元
有功联合控制
频率稳定
hydro turbine
local control unit(LCU)
active power joint control
frequency stability
