采用可控负荷灵敏度的DFIG并网电力系统低频振荡模式抑制  

Damping to Low Frequency Oscillation Modes in DFIG-integrated Power System Based on Sensitivity to Controllable Loads

作　　者：李生虎[1] 方天扬 叶剑桥 LI Shenghu;FANG Tianyang;YE Jianqiao(Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving(School of Electrical Engineering and Automation,Hefei University of Technology),Hefei 230009,Anhui Province,China)

机构地区：[1]新能源利用与节能安徽省重点实验室(合肥工业大学电气与自动化工程学院),安徽省合肥市230009

出　　处：《中国电机工程学报》2024年第7期2641-2654,I0011,共15页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877061)。

摘　　要：双馈感应发电机(doubly fed induction generator,DFIG)并网加剧了低频振荡(low-frequency oscillations,LFO)。电力市场和智能用电设备,使得负荷可参与阻尼控制。此时危险模式阻尼比受负荷影响,增加特征灵敏度解析表达难度。现有恒阻抗模型,不能反映综合负荷对小扰动稳定影响;异步电机模型精确,但参数辨识难度大,很难用于小扰动稳定分析。该文为避免潮流计算和稳定分析中负荷模型差异,采用ZIP负荷模型修正系统状态方程。以潮流解对负荷灵敏度为中间变量,提出危险模式阻尼比对负荷灵敏度的解析表达。引入准比例谐振控制(quasi-proportional resonance,qPR)调节负荷,相应修正阻尼比灵敏度,以改善阻尼控制的鲁棒性。仿真结果验证了所提算法的控制效果。Integration of doubly-fed induction generators(DFIGs)intensifies low frequency oscillation(LFO).With power market and intelligent device,controllable loads may participate into damping control.Thus the damping ratios of the dangerous modes are affected by loads,which adds the difficulty of analytical expression to the eigen-sensitivity.The existing constant-impedance model does not show the impact of the composite load on the small-signal stability.The induction motor model is accurate but difficult to differentiate,and it is not suitable for the small signal stability analysis.In this paper,the ZIP load model is applied to derive the system state equation and avoid modeling difference in power flow and small-signal stability analysis.With the bridge of the sensitivity of power flow solution to the loads,an analytical model of the sensitivity of the damping ratios of the dangerous modes to the loads is proposed.The quasi-proportional resonance(quasi-PR)control is applied to adjust the load,and the sensitivity of the damping ratio is modified accordingly to improve the robustness of the damping control.The simulation results verify the control effect of the proposed algorithm.

关 键 词：双馈感应发电机 低频振荡 阻尼控制 ZIP负荷 准比例谐振控制 灵敏度 

分 类 号：TM73[电气工程—电力系统及自动化]