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Load Characteristic Analysis of Grid Fault Ride-through Process for DFIG Based Large Wind Turbine
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Affiliation:

1.Zhejiang Windey Co., Ltd., Hangzhou310012, China;2.Zhejiang Key Laboratory of Wind Power Technology, Hangzhou310012, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904000).

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    Abstract:

    Currently, the research on the load characteristics of grid fault ride-through of doubly-fed induction generator (DFIG) based wind turbines is insufficient. Firstly, based on the spring-damping-mass modeling method, response models of DFIG based wind turbines for the load of drive train shafting and the side-to-side vibration of tower are established, and then the analytical expressions of the system natural resonance frequency and damping coefficient are obtained. The theoretical analysis results show that the grid fault ride-through process may cause torsional vibration of the drive train and the side-to-side vibration of tower. Secondly, a co-simulation model of GH Bladed and MATLAB is established, and the effects of symmetrical and asymmetrical grid fault ride-through processes on load characteristics of the drive train shafting and tower based on the co-simulation model are studied. Simulation results verify the correctness of the theoretical analysis. Finally, the influence of different active power recovery strategies on the load of wind turbines is further analyzed. The research results show that the over-fast active power recovery rate will significantly increase the load of wind turbines. Therefore, the principle of “mechanically friendly” grid fault ride-through control for wind turbines is further proposed.

    表 1 电压对称跌落20%故障穿越过程与正常工况的载荷结果对比Table 1 Comparison of load results between 20% voltage symmetrical dip fault ride-through process and normal state
    表 4 Table 4
    表 3 不同有功恢复速率的载荷结果对比(20%不对称电压跌落故障穿越)Table 3 Comparison of load results with different active power recovery rates (20% asymmetric voltage dip fault ride-through)
    图1 传动链轴系的幅频特性波特图Fig.1 Bode diagrams of amplitude-frequency characteristics of drive train shafting
    图2 塔架左右运动位移幅频特性波特图Fig.2 Bode diagrams of amplitude-frequency characteristics of side-to-side vibration displacement for tower
    图3 电压对称跌落20%故障穿越过程载荷响应结果Fig.3 Load response results of 20% voltage symmetrical dip fault ride-through process
    图4 电压不对称跌落20%故障穿越过程载荷响应结果Fig.4 Load response results of 20% voltage asymmetric dip fault ride-through process
    图5 不同有功恢复速率的故障穿越过程载荷响应结果Fig.5 Load response results of fault ride-through process with different active power recovery rates
    图 传动链轴系两质量块模型Fig. Dual-mass model of drive train
    图 传动链轴系载荷阶跃响应Fig. Step response of drive train load
    图 塔架左右方向位移阶跃响应Fig. Step response of nacelle side-side deflection
    图 双馈风电机组联合仿真模型Fig. Layout of DFIG wind trubines model
    表 2 电压不对称跌落20%故障穿越过程与正常工况的载荷结果对比Table 2 Comparison of load results between 20% voltage asymmetric dip fault ride-through process and normal state
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Get Citation

YING You,SUN Yong,YANG Jing,et al.Load Characteristic Analysis of Grid Fault Ride-through Process for DFIG Based Large Wind Turbine[J].Automation of Electric Power Systems,2020,44(12):131-138.DOI:10.7500/AEPS20190911006

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History
  • Received:September 11,2019
  • Revised:February 15,2020
  • Adopted:
  • Online: June 18,2020
  • Published: