文章摘要
姜惠兰,范中林,陈娟.动态调整转子撬棒阻值的双馈风机低电压穿越[J].电力系统自动化. DOI: 10.7500/AEPS20170305002.
JIANG Hunlan,FAN Zhonglin,CHEN Juan.Low Voltage Ride-through of Doubly-fed Induction Generator Based on Dynamically Adjusting Crowbar Resistance[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20170305002.
动态调整转子撬棒阻值的双馈风机低电压穿越
Low Voltage Ride-through of Doubly-fed Induction Generator Based on Dynamically Adjusting Crowbar Resistance
DOI:10.7500/AEPS20170305002
关键词: 双馈风力发电机; 自适应控制; 低电压穿越  转子撬棒
KeyWords: doubly-fed induction generator  adaptive control strategy  low voltage ride-through  rotor crowbar
上网日期:2017-09-08
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
姜惠兰 智能电网教育部重点实验室天津大学 jhl2009yan@126.com 
范中林 智能电网教育部重点实验室天津大学 15822905853@163.com 
陈娟 智能电网教育部重点实验室天津大学 269033110@qq.com 
摘要:
      双馈异步风力发电机(DFIG)等大型电力电子发电设备接入电网,改变了电力系统源端的暂态特性。在系统故障下,为保证风机不脱网运行,常采用转子Crowbar保护电路完成低电压穿越(LVRT)。风机暂态特性与故障发生时刻和故障程度有关,传统固定阻值的撬棒电路很难保证不同故障下的低电压穿越。本文从时域角度推导了撬棒投入后的暂态转子电流表达式,并提出了基于动态调整转子撬棒阻值的DFIG低电压穿越方案,制定了Crowbar自适应控制策略及阻值整定方法。仿真分析了不同电压跌落深度下所提方案的LVRT特性。结果表明本文所提方法能够满足不同电压跌落深度下的转子电流和直流母线电压,而且降低了撬棒投入次数及时间。
Abstract:
      Doubly-fed induction generator(DFIG) on the power grid changes the transient performance of sources in power system. A rotor crowbar is usually used to realize low voltage ride-through during short-circuit fault. The transient performance of DFIG is determined by the fault inception and the system fault severity. It is difficult to realize low voltage rid-through in various fault severities using the fixed resistance crowbar. The expression of transient rotor current with crowbar resister input was deduced in this paper. A low voltage ride-through scheme of doubly-fed induction generator through dynamically adjusting crowabar resistance was proposed. An adaptive control strategy and the resistance setting method were given. Applying the scheme proposed, the LVRT performance of DFIG was simulated during different voltage dips. The results show that it is effective to suppress rotor current and DC bus voltage using the scheme proposed. Meanwhile the working time of crowbar was shortened and action times were confined.
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