基于DFIG无功出力灵敏度的电网弱阻尼模式抑制  

Suppression to Power System in Weakly Damped Modes Based on Sensitivity to Reactive Output of DFIG

作　　者：李生虎[1] 于新钰 华玉婷 韩伟 宋闯 LI Shenghu;YU Xinyu;HUA Yuting;HAN Wei;SONG Chuang(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]中国科学院等离子体物理研究所,合肥230031 [3]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《高电压技术》2022年第4期1356-1364,共9页High Voltage Engineering

基　　金：国家自然科学基金(51877061);国家电网公司科技项目(52170221000U)。

摘　　要：双馈感应发电机(doubly-fed induction generator,DFIG)与同步发电机(synchronous generator,SG)间动态交互,会影响电力系统的振荡特性。现有研究建立了电网振荡模式对SG出力的灵敏度,但是未见DFIG无功出力影响电网振荡模式的研究。为此,建立了DFIG并网电力系统小扰动稳定性模型,分析状态矩阵中受DFIG无功影响的元素,建立特征值与节点电压的关系;基于潮流方程,求取节点电压对DFIG无功的灵敏度,最终首次提出了弱阻尼模式对DFIG无功出力灵敏度的解析表达。研究结果表明,DFIG无功和SG出力调节对振荡稳定性的改善效果相近,DFIG无功并非同向改变所有弱阻尼模式。调整DFIG无功需要考虑多模式的协调。The oscillatory characteristics of power system may be influenced by the dynamic interaction between the doubly-fed induction generators(DFIGs)and the synchronous generators(SGs).The existing study focuses on the sensitivity of the oscillatory modes to outputs of the SG,but the influence of the reactive power of the DFIG on the oscillatory modes has not been studied yet.This paper derives a small-signal stability model of power system with the DFIG.The elements of state matrix affected by the reactive power of the DFIG are decided,and the relationship between the eigenvalues and the bus voltages is derived.With the help of the power flow equation,the sensitivity of bus voltages to the reactive power of the DFIG is found.Finally,the analytical expression of the sensitivities of the weakly damped modes to the reactive power of the DFIG is newly proposed.The research results show that the improvement effect of DFIG reactive power and SG output adjustment on oscillation stability is similar,and DFIG reactive power does not change all weakly damped modes in the same direction.Multi-mode coordination should be considered when adjusting DFIG reactive power.

关 键 词：风电并网系统 双馈感应发电机 小干扰稳定性 弱阻尼模式 无功调节 灵敏度 

分 类 号：TM614[电气工程—电力系统及自动化]