基于区域极点配置的风电系统弱阻尼低频振荡模式抑制

李生虎; 孙琪; 石雪梅; 黄杰杰

引用本文:	李生虎,孙琪,石雪梅,等.基于区域极点配置的风电系统弱阻尼低频振荡模式抑制[J].电力系统保护与控制,2017,45(20):14-20.
	LI Shenghu,SUN Qi,SHI Xuemei,et al.Suppression of weakly damped low-frequency modes of wind power system based on regional pole placement[J].Power System Protection and Control,2017,45(20):14-20

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基于区域极点配置的风电系统弱阻尼低频振荡模式抑制
李生虎¹,孙琪¹,石雪梅²,黄杰杰¹
(1.合肥工业大学电气与自动化工程学院，安徽合肥 230009; 2.安徽省电力公司经济技术研究院，安徽合肥 230061)

摘要:

风电并网不仅影响原有低频振荡模式，而且可能引入新的模式。改善单个低频振荡模式，可能削弱其他模式阻尼。基于双馈风电机组详细建模，建立风电系统状态空间方程，选择控制变量和输出变量。考虑双馈风电机组出力变化，分析弱阻尼低频模式区域极点配置的必要性。兼顾电网原有及新引入弱阻尼低频模式，构建降阶模型。采用基于线性矩阵不等式的区域极点配置法，设计输出反馈控制器，将所有弱阻尼低频模式配置在设定区域，提高其阻尼比，并增加系统稳定裕度。算例分析表明，所设计控制器有效提高所有弱阻尼低频模式的阻尼，改善了风电系统振荡特性。

关键词: 风电系统低频振荡弱阻尼区域极点配置输出反馈控制器双馈感应发电机

DOI：10.7667/PSPC201704

分类号:

基金项目:国家自然科学基金资助项目(51637004)

Suppression of weakly damped low-frequency modes of wind power system based on regional pole placement

LI Shenghu¹,SUN Qi¹,SHI Xuemei²,HUANG Jiejie¹

(1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China;2. Economics and Technology Research Institute, Anhui Electric Power Company, Hefei 230061, China)

Abstract:

Wind power integration will influence the existing low-frequency oscillation modes and possibly introduce new modes. Suppression of one single low-frequency oscillation mode may decrease damping of other modes. Based on detailed modeling to the doubly-fed induction generator (DFIG), the state space equations of wind power system are established and the control variables and output variables are determined. The impact of DFIG output is analyzed to reveal the necessity of the regional pole placement of the weakly damped oscillation modes. A reduced-order model is derived considering both the existing and newly introduced modes. The regional pole placement based on linear matrix inequality is applied to design the output feedback controller. All the weakly damped modes are placed within the desired region to increase the damping ratio and improve the stability margin. Numerical results show that the designed output feedback controller effectively increases the damping of all weak damping modes and suppresses the oscillation characteristic of wind power systems. This work is supported by National Natural Science Foundation of China (No. 51637004).

Key words: wind power system low frequency oscillation weak damp regional pole placement output feedback controller doubly-fed induction generator

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