基于DFIG稳态有功功率下限和电网小扰动稳定灵敏度的DFIG有功功率备用容量范围  

Active Power Reserve Capacity Range of DFIG Based on the Lower Limit of Steady-State Active Power of DFIG and Small-Disturbance Stability Sensitivity of Power System

作　　者：李生虎[1,2] 陈东 齐楠 夏伟健 LI Shenghu;CHEN Dong;QI Nan;XIA Weijian(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving,Hefei 230009,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]新能源利用与节能安徽省重点实验室,合肥230009

出　　处：《南方电网技术》2023年第8期1-10,共10页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51877061)。

摘　　要：随着风电并网的快速增加,要求风电机组如双馈感应风电机组(doubly-fed induction generator,DFIG)参与电网有功平衡和频率稳定,为此需要确定其有功功率备用容量范围。提出了超速模式下确定DFIG有功功率备用容量范围的方法。建立了并网DFIG的潮流模型,计及转速与转子侧变流器(rotor-side converter,RSC)的容量约束,确定了DFIG稳态有功功率下限。在此运行方式下,对电网进行了特征值分析以发现危险模式。考虑转差率影响初值和状态矩阵,拓展了潮流雅可比矩阵,建立了危险模式对转差率灵敏度的解析表达。根据上述灵敏度,筛选出与转差率强相关的危险模式,通过调节PI参数或/和转差率以消除危险模式。最后根据转差率取值确定出DFIG有功功率的备用容量范围。算例仿真结果验证了所提算法的正确性和控制效果。With the rapid increase of wind power intergration,wind turbines such as doubly-fed induction generator(DFIG),are required to participate in active power balance and frequency stability of power system.Therefore,it is necessary to determine the ac⁃tive reserve capacity range of DFIGs.A method is proposed to determine the range of active reserve capacity of DFIGs in overspeed mode.The power flow model of grid-connected DFIGs is established,which takes into account speed and rotor-side converter(RSC)capacity constraints,and determines the lower limit of DFIG steady-state active power.Under this operation mode,the eigenvalue analysis to the power system is performed to find the dangerous modes.Since the slip rate affects the initial value and the state matrix,the Jacobian matrix is extended to establish the analytical expression of the sensitivities of the dangerous mode to slip rate.Based on the above sensitivity,power flow for hazard modes strongly related to slip rate is screened,and adjust PI parameters or/and slip rate are adjusted to eliminate the dangerous mode.Finally,the range of DFIG active reserve capacity is determined based on the slip rate value.The simulation results of the example verify the correctness and control effectiveness of the proposed algorithm.

关 键 词：双馈感应发电机 有功功率备用容量范围 稳态有功功率下限 特征值灵敏度 小扰动稳定约束 

分 类 号：TM712[电气工程—电力系统及自动化] TM614