弱电网下双馈风力发电系统的稳定性极限研究
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TM74

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国家自然科学基金资助项目(51777146);湖北省自然科学基金资助项目(2020CFB135)


Stability limit of double-fed induction generator system connected to weak grid
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    摘要:

    针对大规模风电机组接入电力系统导致电网强度变弱,引起直流电压时间尺度的不稳定问题,文中研究了弱交流电网下双馈风机(DFIG)的稳定性极限。首先,研究DFIG注入电网的有功功率、端电压与转子dq轴电流间的关系以及稳定性极限的物理约束,并进行灵敏度分析,总结有功功率对转子d轴电流的灵敏度的变化规律;然后,建立连接弱电网的DFIG的小信号模型,通过特征根轨迹分析,研究DFIG控制环路的动态行为对其稳定性极限的影响。结果表明,在极弱电网情况下,等阻尼降低锁相环(PLL)带宽或提高端电压环带宽可提高稳定性极限;若不考虑动态无功支撑,DFIG的稳定运行功角限制在50°左右,若考虑所有控制环路的动态过程,DFIG的运行功角极限约为60°。

    Abstract:

    With large-scale wind turbines connected to the power system, the power grid strength becomes weak, leading to unstability problem of wind turbines in DC voltage control timescale. The stability limit of double-fed induction generator (DFIG) system connected to weak AC grid is studied in this paper. Firstly, the relationship between the active power and terminal voltage of DFIG injected into the power grid and the current of the dq axes of the rotor as well as the physical constraints of the stability limit are studied, and the sensitivity is analyzed. The sensitivity of active power to rotor d-axis current is summarized. Then, a small-signal model of DFIG connected to weak grid is built. Through the eigenvalue analysis, the influence of the dynamic behavior of the control loop of DFIG on its stability limit is studied. The results show that the stability limit can be increased by decreasing the bandwidth of the phase locked loop (PLL) or increasing the bandwidth of the terminal voltage control loop with equal damping in the normal operating range, when the dynamic process of all control loops is considered. Without considering the dynamic reactive power support, the power angle of DFIG is limited to about 50°. Considering the dynamic process of all control loops, the limit of the power angle of DFIG is about 60°.

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黄云辉,王凌云,喻恒凝,王栋,朱国荣,黄云虹.弱电网下双馈风力发电系统的稳定性极限研究[J].电力工程技术,2022,41(4):9-17

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  • 收稿日期:2022-02-18
  • 最后修改日期:2022-05-24
  • 录用日期:2021-10-13
  • 在线发布日期: 2022-07-20
  • 出版日期: 2022-07-28