基于转子串联动态电阻的自适应双馈风电机组低电压穿越方案
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摘要
针对基于转子串联电阻实现双馈风电机组低电压穿越的保护方式,在阻值选择时转子电流的限制效果与故障期间功率可控性之间存在矛盾的问题,通过对转子串电阻保护的理论分析,提出一种结合故障期间自适应选择转子串联电阻阻值和切换转子变换器控制模式的低电压穿越方案,能够实现根据电压跌落深度选择串联阻值且于不同故障区间内自适应切换阻值的串联动态电阻,使整个故障过程中风机处于受控状态,故障穿越更平稳,具有更好的暂态特性。PSCAD仿真结果表明,该方案具有较好的性能。
This paper aims to solve the problem about the selection of rotor series resistance which is used to realize the low voltage ride through(LVRT)in double-fed wind turbines.By analyzing the theory of the protection using rotor series resistance,this method can choose the rotor series resistance and switch the control mode of rotor convert according to the depth of voltage drop.In addition,for the adaptive switching resistance in different fault progress.This method is under control during the fault progress,so that the fault ride-through is more smooth and steady,and the system has better quality in transient characteristics.The modeling and simulating result based on PSCAD software shows the effectiveness of this method.
This paper aims to solve the problem about the selection of rotor series resistance which is used to realize the low voltage ride through(LVRT)in double-fed wind turbines.By analyzing the theory of the protection using rotor series resistance,this method can choose the rotor series resistance and switch the control mode of rotor convert according to the depth of voltage drop.In addition,for the adaptive switching resistance in different fault progress.This method is under control during the fault progress,so that the fault ride-through is more smooth and steady,and the system has better quality in transient characteristics.The modeling and simulating result based on PSCAD software shows the effectiveness of this method.
引文
[1] 焦在强.大规模风电接入的继电保护问题综述[J].电网技术,2012,36(7):195-201.
[2] Mohammadi J,Afsharnia S,Vaez-Zadeh S.EfficientFault-ride-through Control Strategy of DFIG-basedWind Turbines during the Grid Faults[J].EnergyConversion and Management,2014,78(2):88-95.
[3] 胡家兵,孙丹,贺益康,等.电网电压骤降故障下双馈风力发电机建模与控制[J].电力系统自动化,2006,30(8):21-26.
[4] 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.
[5] 凌禹,蔡旭.基于转子串电阻的双馈风电机组故障穿越技术[J].电力自动化设备,2014,34(8):25-30.
[6] 张文娟,马浩淼,张国慨,等.基于转子串联电阻的双馈风力发电机低电压穿越[J].电力自动化设备,2015,35(12):28-33.
[7] Lopez J,Sanchis P,Roboam X,et al.Dynamic Be-havior of the Doubly Fed Induction Generator duringThree-phase Voltage Dips[J].IEEE TransactionEnergy Conversion,2007,22(3):709-717.
[2] Mohammadi J,Afsharnia S,Vaez-Zadeh S.EfficientFault-ride-through Control Strategy of DFIG-basedWind Turbines during the Grid Faults[J].EnergyConversion and Management,2014,78(2):88-95.
[3] 胡家兵,孙丹,贺益康,等.电网电压骤降故障下双馈风力发电机建模与控制[J].电力系统自动化,2006,30(8):21-26.
[4] 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.
[5] 凌禹,蔡旭.基于转子串电阻的双馈风电机组故障穿越技术[J].电力自动化设备,2014,34(8):25-30.
[6] 张文娟,马浩淼,张国慨,等.基于转子串联电阻的双馈风力发电机低电压穿越[J].电力自动化设备,2015,35(12):28-33.
[7] Lopez J,Sanchis P,Roboam X,et al.Dynamic Be-havior of the Doubly Fed Induction Generator duringThree-phase Voltage Dips[J].IEEE TransactionEnergy Conversion,2007,22(3):709-717.