| 引用本文: | 龚文明,胡书举,许洪华.一种适用于大型风电场实时仿真的双馈风力发电机响应模型[J].电力自动化设备,2014,34(4): |
| GONG Wenming,HU Shuju,XU Honghua.Response model of DFIG for real-time simulation of large-scale wind farms[J].Electric Power Automation Equipment,2014,34(4): |
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| 摘要: |
| 提出了一种基于动态响应的双馈发电机响应模型。由于使用代数运算取代微分方程迭代求解，使得模型计算量大为减少，可用于风电场的实时仿真与风电场控制器的硬件在环测试。该响应模型根据电网电压条件将双馈电机的运行分为正常运行与故障运行2种状态：正常运行时，定、转子输出电流能够很好地跟踪指令值，因此可以将电机等效为一个时间常数很小的惯性环节；电网电压发生跌落故障时，电机的定、转子上将出现较大的冲击电流。基于磁链不能突变的原理，研究了故障前运行状态、电机参数、撬棒阻值等对故障电流的影响，得到了双馈发电机定、转子故障电流的近似解析表达式。通过与常规4阶模型的对比仿真，验证了响应模型的正确性。 |
| 关键词: 风力发电 双馈感应发电机 低电压穿越 响应模型 撬棒电阻 风电场 |
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| 基金项目:国家高技术研究发展计划（863计划）资助项目（2011-AA050204） |
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| Response model of DFIG for real-time simulation of large-scale wind farms |
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GONG Wenming1,2,3, HU Shuju2,3, XU Honghua2,3
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1.University of Chinese Academy of Sciences，Beijing 100190，China;2.Institute of Electrical Engineering，Chinese Academy of Sciences，Beijing 100190，China;3.Key Laboratory of Wind Energy Utilization，Chinese Academy of Sciences，Beijing 100190，China
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| Abstract: |
| A response model of DFIG（Doubly Fed Induction Generator） is proposed based on its dynamic response，which，instead of differential equations，applies algebra methods to improve its computational efficiency for the real-time simulation of wind farm and the in-loop test of its hardware controller. Two kinds of DFIG operation are classified according to grid voltage：normal operation and faulty operation. As the output currents of DFIG well follow the references during normal operation，it can be equated to an inertia component with small time constant. As large impulsive currents may appear in both its stator and rotor during grid voltage dip，the impacts of pre-fault condition，generator parameters and Crowbar resistance on fault current are studied and the analytical expressions of fault currents are derived based on the flux invariance principle. The comparison with the conventional 4th-order model verifies the correctness of the proposed model. |
| Key words: wind power doubly fed induction generator low voltage ride through response model Crowbar resistor wind farms |
