双馈风力发电机低电压穿越控制策略量化评价  

Quantitative Evaluation of Low Voltage Ride-through Control Strategies for Doubly-fed Induction Generators

作　　者：邓三星 张雪敏[1] 刘辉 陈来军[1] DENG Sanxing;ZHANG Xuemin;LIU Hui;CHEN Laijun(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Electric Power Research Institute of State Grid Jibei Electric Power Company,Beijing 100045,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]国网冀北电力有限公司电力科学研究院,北京市100045

出　　处：《电力系统自动化》2018年第21期28-35,共8页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划资助项目(2013CB228201);国家电网公司科技项目(52010118000N)~~

摘　　要：近年来风电发展迅速,低电压穿越(LVRT)能力是衡量其暂态运行能力的关键指标。已有学者对提高双馈风力发电机(DFIG)的LVRT能力进行了大量研究,然而针对不同的LVRT控制策略缺乏定量的评价标准。针对DFIG,利用局部输入—输出稳定理论,以外部电压变化为扰动,提出了DFIG的LVRT控制策略定量评价标准。首先,基于局部输入—输出稳定理论的积分—积分估计形式,结合DFIG实际运行要求以及不同控制策略在持续电压干扰下的响应,分析了各个控制策略的局部输入—输出稳定属性。然后,考虑到利用线性函数估计输入—输出增益保守性较大,采用了分段线性函数,并设计了相应算法。最后,基于量化的局部输入—输出稳定属性,提出了定量评价指标,分析了不同控制策略的优劣,并给出了具体改进方案。算例测试证实了改进方案能够在无附加硬件时,充分利用不同控制策略的优势。Wind power generation has been developed rapidly in recent years,and the low voltage ride-through（LVRT）ability has been a critical indicator measuring the transient operation ability of wind power.Much research has been done about how to improve the LVRT ability of doubly-fed induction generator（DFIG）,but some quantitative evaluation criteria of control strategies for LVRT are absent.Taking external voltage variation as a disturbance,some quantitative evaluation criteria of LVRT control strategies for DFIG adopting local input-to-state stability theory is proposed.First,the local input-to-output stability（LIOS）properties of different control strategies are analyzed combined with practical operation requirements of DFIG and responses of different control strategies under continuous external voltage disturbance based on the integral-integral estimate expression of LIOS.Then,as the input-to-output gain with a linear function form is more conservative,apiecewise linear function is adopted to estimate the input-to-output gain function with a corresponding algorithm designed.Finally,the merits of different control strategies are analyzed with the quantitative LIOS properties and quantitative evaluation index.A specific improvement strategy is raised with a case validating that it can make full use of advantages of different control strategies in the absence of additional hardware.

关 键 词：双馈风力发电机 局部输入—状态稳定 局部输入—输出稳定 积分—积分估计 低电压穿越控制 

分 类 号：TM614[电气工程—电力系统及自动化]