死区和限幅环节对简化水电系统负阻尼时切换型振荡的影响  

Influence of Dead Zone and Limiting Link on Switching-type Oscillation of Simplified Hydropower Generator System With Negative Damping

作　　者：刘晓博 熊鸿韬 王嘉伟 杨滢 张建承 庄文彬 华文 薛安成 LIU Xiaobo;XIONG Hongtao;WANG Jiawei;YANG Ying;ZHANG Jiancheng;ZHUANG Wenbin;HUA Wen;XUE Ancheng(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Source(North China Electric Power University),Changping District,Beijing 102206,China;Electric Power Research Institute of State Grid Zhejiang Electric Power Company,Hangzhou 310014,Zhejiang Province,China;Electric Power Dispatching and Control Center of State Grid Zhejiang Electric Power Company,Hangzhou 310007,Zhejiang Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网浙江省电力有限公司电力科学研究院,浙江省杭州市310014 [3]国网浙江省电力有限公司调度控制中心,浙江省杭州市310007

出　　处：《电网技术》2022年第8期3215-3223,共9页Power System Technology

基　　金：国网浙江省电力公司科技项目(5211DS200086):“大受电背景下基于暂态响应的差异化网源协调控制优化技术研究”。

摘　　要：死区或限幅起作用的单机水电系统负阻尼时超低频频率振荡(切换型超低频频率振荡)可对应类Hopf非光滑分岔;同时,死区和限幅决定非光滑系统结构,影响系统振荡特性。有鉴于此,分析了一次调频中死区和限幅环节对死区和限幅参与的单机水电系统负阻尼时频率振荡及其类Hopf非光滑分岔的影响。具体地,首先,分析了典型死区下,有/无限幅的单机系统在突变负荷扰动下的平衡点和故障后轨线的类Hopf分岔特性;进一步,对比分析了有/无限幅、不同死区大小时,单机系统类Hopf分岔特性的变化情况。结果表明,对应振荡发生/消失的类Hopf分岔点受死区和限幅(系统切换边界)的影响。通过增大死区可在一定程度上避免切换型频率振荡的发生,而设置限幅可避免极端负荷扰动下,系统出现频率失稳的风险。The frequency oscillation(or the switch-type ultra-low frequency oscillation, ST-ULFO) of the singlehydropower-generator power system(SHG-PS) with negative damping engaged with dead zone or limit tend to correspond to the Hopf-like non-smooth bifurcation;at the same time, the dead zone and limit determine the structure of the non-smooth system and seriously affect the characteristic of the oscillations. In recognizing the above situation, this paper analyzes the influence of the dead zone and the limit in the primary frequency modulation on the ST-ULFO and the Hopf-like non-smooth bifurcation of the SHG-PS in case of negative damping. Specifically, first, to the SHG-PS with/without limit under the typical value of dead zone, the Hopf-like bifurcation characteristics of the equilibrium point and the post-fault trajectory under the sudden load disturbance are analyzed. Furthermore, to the SHG-PS with/without limit under different dead zones, the different characteristics of the Hopf-like bifurcation are presented and contrasted. The results show that the Hopf-like bifurcation corresponding to the occurrence/disappearance of the oscillations is affected by the dead zone and the limit(or the switching boundary of system). By the means of increasing the dead zone value, the ST-ULFO can be avoided to a certain extent. And setting the limit can avoid the risk of frequency instability under the extreme load disturbance.

关 键 词：普通型死区 限幅 超低频频率振荡 类Hopf分岔 切换型振荡 

分 类 号：TM721[电气工程—电力系统及自动化]