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弱电网下双馈风电机组电网电压扰动补偿控制策略
作者:
作者单位:

1.哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市 150001;2.上海建坤信息技术有限公司,上海市 200032

作者简介:

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904000);国家自然科学基金资助项目(51977046,51577040)。


Control Strategy of Disturbance Compensation for Grid Voltage of DFIG-based Wind Turbine in Weak Grid
Author:
Affiliation:

1.School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China;2.Shanghai Jiankn Information Technology Company, Shanghai 200032, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904000) and National Natural Science Foundation of China (No. 51977046, No. 51977040).

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    摘要:

    针对弱电网下双馈风电并网系统的稳定性问题,文中提出了一种基于电网电压扰动补偿的双馈风电机组补偿控制策略。首先,在同步旋转坐标系下建立双馈风电机组,包括转子侧变换器和网侧变换器的统一阻抗模型。然后,基于所建立的阻抗模型分析了并网点电压扰动到控制器输出的传递关系,分别在转子侧电流环和网侧电流环引入了电压扰动补偿对变换器进行改进控制,并通过广义奈奎斯特判据证明了该方法能有效提高双馈风电机组在弱电网下的并网稳定性。理论分析表明,基于并网点电压扰动补偿的转子侧和网侧补偿控制能很好地改善双馈风电机组的输出阻抗特性,从而提高其在弱电网下的稳定性。最后,通过仿真分析验证了该补偿控制方法的有效性。

    Abstract:

    A compensation control strategy for doubly-fed induction generator (DFIG)-based wind turbine based on disturbance compensation of grid voltage is proposed in this paper to solve the stability problem of grid-connected in weak grid. Firstly, a unified impedance model of DFIG-based wind turbine is established in the synchronous reference frame including rotor side converter (RSC) and grid side converter (GSC). Then, based on the established impedance model, the transfer relationship between the point of common coupling voltage and the controller output is analyzed, the voltage disturbance compensation is introduced into the current loop of RSC and GSC respectively to improve the converter control. The generalized Nyquist criterion (GNC) proves that the proposed method can effectively improve the grid-connected stability of DFIG-based wind turbine in weak grid. Theoretical analysis shows that the compensation control of RSC and GSC based on the point of common coupling voltage disturbance compensation can improve the impedance characteristics of DFIG so as to improve their stability under weak grid condition. Finally, the effectiveness of the proposed compensation control method is verified by simulation.

    表 1 Table 1
    表 2 Table 2
    图1 双馈风电机组结构框图Fig.1 Structure diagram of DFIG-based wind turbine
    图2 双馈风电机组导纳模型的频率扫描结果Fig.2 Frequency scan result of admittance model for DFIG-based wind turbine
    图3 转子侧电流环补偿控制器框图Fig.3 Structure diagram of current loop compensation controller on rotor side
    图4 不同补偿系数时系统广义奈奎斯特图Fig.4 Nyquist plots of system with different compensation coefficients
    图5 定子有功功率波形Fig.5 Waveform of active power for stator
    图 双馈风电机组转子侧变换器控制框图Fig. Structure diagram of RSC converter controller
    图 双馈风电机组网侧变换器控制框图Fig. Structure diagram of GSC converter controller
    图 锁相环结构框图Fig. Structure diagram of PLL
    图 电压扰动到转子侧变换器输出传递关系Bode图Fig. Bode plot of transfer relationship between RSC converter output and grid voltage disturbance
    图 电压扰动到网侧变换器输出传递关系Bode图Fig. Bode plot of transfer relationship between GSC converter output and grid voltage disturbance
    图 网侧电流环补偿控制器框图Fig. Structure diagram of GSC current loop compensation controller
    图 引入转子侧和网侧补偿控制前后双馈风电机组等效导纳Bode图Fig. Bode plot of DFIG equivalent admittance with and without RSC and GSC compensation control
    图 不同电网强度下系统的广义奈奎斯特图Fig. System Nyquist plots with different SCR
    图 引入转子侧和网侧补偿控制的广义奈奎斯特图Fig. Nyquist plots with and without the compensation control on RSC and GSC
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引用本文

张学广,张雅阁,方冉,等.弱电网下双馈风电机组电网电压扰动补偿控制策略[J].电力系统自动化. DOI:10.7500/AEPS20190216002.

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  • 收稿日期:2019-02-16
  • 最后修改日期:2020-01-20
  • 录用日期:2019-09-09
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