考虑三重因素的双馈风电机组撬棒电路保护控制策略分析
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摘要
撬棒(Crowbar)电路作为提高双馈风电机组低电压穿越能力的主要措施之一,其控制策略的选取对风电机组动态特性影响较大。针对电网故障持续时间、机端电压跌落深度以及故障时刻风机运行状态三重因素,在Matlab/Simulink平台上搭建含Crowbar电路的双馈风电机组模型,通过对转子侧电流分析,验证了这三重因素对转子侧电流的影响。仿真结果表明,在电网故障持续时间较长、电压跌落较深、风机运行点较高时应采用Crowbar阈值投入故障清除后延时退出的控制策略,相反则应选择Crowbar阈值投入延时退出的控制策略,并给出Crowbar动作区域曲线和Crowbar控制策略选择区域曲线,明确两种控制策略的适用范围,初步得到了Crowbar保护控制策略。
Crowbar protection circuit as one of the main measures to implement the capacity of low voltage ride through(LVRT) of doubly-fed induction generator(DFIG),the selection of its control strategy has great influence on the dynamic characteristics of wind turbines.By analyzing the rotor current via a simulation model of DFIG with crowbar circuit built on Matlab/Simulink platform, the influence of the three factors including the duration of the fault,voltage drop levels and DFIG operating state during the LVRT is evaluated.The simulation results show that crowbar circuit should follow the control strategy of threshold input and delayed exit after the fault clearing in case of long duration of grid failure,deeper drop of the voltage and higher point of DFIG operating.Conversely,the control strategy of threshold input and delayed exit should be adopted.The crowbar action area curve and crowbar control strategy selection area curve are provided.The scope of application of the two control strategies are identified clearly and a crowbar protection control strategy of doubly-fed induction generator obtained.
Crowbar protection circuit as one of the main measures to implement the capacity of low voltage ride through(LVRT) of doubly-fed induction generator(DFIG),the selection of its control strategy has great influence on the dynamic characteristics of wind turbines.By analyzing the rotor current via a simulation model of DFIG with crowbar circuit built on Matlab/Simulink platform, the influence of the three factors including the duration of the fault,voltage drop levels and DFIG operating state during the LVRT is evaluated.The simulation results show that crowbar circuit should follow the control strategy of threshold input and delayed exit after the fault clearing in case of long duration of grid failure,deeper drop of the voltage and higher point of DFIG operating.Conversely,the control strategy of threshold input and delayed exit should be adopted.The crowbar action area curve and crowbar control strategy selection area curve are provided.The scope of application of the two control strategies are identified clearly and a crowbar protection control strategy of doubly-fed induction generator obtained.
引文
[1]徐殿国,王伟,陈宁.基于撬棒保护的双馈电机风电场低电压穿越动态特性分析[J].中国电机工程学报,2010,30(22):29-36.
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[2]孙银锋,李国庆,王利猛,等.基于撬棒保护的双馈风电机组动态特性分析[J].电测与仪表,2014,51(2):23-26.
[3]RODRIGUEZ M,ABAD G,SARASOLA I,et al.Crowbar Control Algorithms for Doubly-fed Induction Generator During Voltage Dips[C].European Conference on Power Electronics and Applications,Spain,2005.
[4]王继飞,李培强,李欣然,等.双馈风电机组低电压穿越的Crowbar优化控制策略分析[J].中国电力,2015,48(11):103-109.
[5]许寅,陈颖,梅生伟.风电发电机组暂态仿真模型[J].电力系统自动化,2011,35(9):100-107.
[6]蒋雪冬,赵舫.应对电网电压骤降的双馈感应风力发电机Crowbar控制策略[J].电网技术,2008,32(12):84-89.
[7]訾鹏,周孝信,田芳,等.双馈式风力发电机的机电暂态建模[J].中国电机工程学报,2015,35(5):1 106-1 114.
[8]张艳霞,童锐,赵杰,等.双馈风电机组暂态特性分析及低电压穿越方案[J].电力系统自动化,2013,37(6):7-11,62.