摘要
水轮机的调速死区及其限幅对超低频振荡特性的影响较大,甚至可导致大扰动下的正阻尼系统振荡。现有的超低频振荡的控制方法主要是优化水轮机调速器的比例积分微分控制(proportional-integral-derivative control,PID)参数,提高系统阻尼。但该方法未同时考虑死区和限幅参数。该文提出一种考虑水轮机调速死区和限幅优化的超低频振荡控制方法。首先,在含死区和限幅的非光滑单机水电系统中,分析死区和限幅参与的持续等幅振荡的形成原因与相关参数的影响,得到控制参数优化的定性需求;其次,建立包含非光滑部分的抑制效应、光滑部分的放大效应、一次调频性能的综合评价指标;再次,基于粒子群算法求解优化参数,给出了所提方法的具体应用案例;最后,分别在单机系统、四机两区域系统和某大电网的仿真系统中,将该方法与未考虑死区和限幅优化的控制方法进行对比,证明所提方法具有更好的一次调频性能和抗扰动性。
The dead zone and limiting of a hydraulic turbine governor have a great influence on the characteristics of the ultra-low frequency oscillations(ULFOs),which can even lead to the oscillation of the positive damping system under large disturbance.However,the existing control methods for ULFOs mainly focus on optimizing proportional-integral-derivative(PID)control parameters of hydraulic turbine governors to improve system damping,without considering the dead zone and limiting parameters concurrently.This paper proposes a ULFO control method considering the dead zone and limiting optimization of the turbine governor and verifies its effectiveness and superiority.Firstly,in a non-smooth single hydro-generator power system(SHPS)with dead zone and limiting,the causes of continuous oscillation with constant amplitude involving dead zone and limiting are analyzed,and the influence of relevant parameters is analyzed,obtaining the qualitative demand for control parameter optimization.Then,a comprehensive evaluation index including the suppression effect of the non-smooth part,the amplification effect of the smooth part,and the performance of the primary frequency regulation is established.Additionally,the optimization parameters are solved using a particle swarm optimization algorithm,and a specific application case of the proposed method is presented.Finally,the proposed method is compared with the control method that does not consider dead zone and limiting optimization,in three simulation systems:SHPS,a four-machine two-area system,and a large-scale power grid model.The proposed method shows improved performance in primary frequency regulation and resistance to disturbance.
作者
王嘉伟
章德
谢宇峥
薛安成
WANG Jiawei;ZHANG De;XIE Yuzheng;XUE Ancheng(Economic Research Institute,State Grid Hunan Electric Power Co.,Ltd.,Changsha 410007,China;State Grid Hunan Electric Power Co.,Ltd.,Changsha 410004,China;Hunan Provincial Key Laboratory,Energy Internet Supply and Demand Operation,Changsha 410007,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source,North China Electric Power University,Beijing 102206,China)
出处
《电力科学与技术学报》
北大核心
2025年第2期68-79,共12页
Journal of Electric Power Science And Technology
基金
湖南省科技创新平台与人才计划(2019TP1053)
国网湖南省电力有限公司专业咨询项目(B616A2240008)。
关键词
死区
限幅
超低频振荡
控制
一次调频
dead zone
limiting
ultra-low frequency oscillation
control
primary frequency regulation
