文章摘要
邓三星,张雪敏,刘辉,等.双馈风力发电机低电压穿越控制策略量化评价[J].电力系统自动化,2018,42(21):28-35. DOI: 10.7500/AEPS20180306013.
DENG Sanxing,ZHANG Xuemin,LIU Hui, et al.Quantitative Evaluation of Low Voltage Ride-through Control Strategies for Doubly-fed Induction Generators[J].Automation of Electric Power Systems,2018,42(21):28-35. DOI: 10.7500/AEPS20180306013.
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
DOI:10.7500/AEPS20180306013
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
KeyWords: doubly-fed induction generator(DFIG)  local input-to-state stability  local input-to-output stability  integral-integral estimate  low voltage ride-through(LVRT)control
上网日期:2018-09-11
基金项目: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)
作者单位E-mail
邓三星 清华大学电机工程与应用电子技术系, 北京市 100084  
张雪敏 清华大学电机工程与应用电子技术系, 北京市 100084 zhangxuemin@mail.tsinghua.edu.cn 
刘辉 国网冀北电力有限公司电力科学研究院, 北京市 100045  
陈来军 清华大学电机工程与应用电子技术系, 北京市 100084  
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。
Abstract:
      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, a piecewise 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.
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