直驱风电场和串补之间的次同步振荡风险
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江苏省自然科学基金资助项目(BK20210057)


Sub-synchronous oscillation risk between PMSG farm and series complement
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Youth project of Jiangsu Natural Science Foundation - Research on oscillation propagation mechanism and measurement data driven oscillation source determination theory of high density power grid with multiple power electronic converters (No. BK20210057)

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    摘要:

    随着电网规模的持续扩大,串补长距离输电系统引发的次同步振荡现象频现。因此,为探析串补输电系统失稳的深层原因,文中基于开环模式谐振理论,提出一种串补输电线路引发次同步振荡的开环模式谐振分析方法,建立直驱风电场外接串补输电线路的小信号模型,通过开环模式谐振分析方法研究了串补线路和直驱风电场之间的动态交互作用。结果表明:串补主导的开环次同步振荡模式与风电场主导的开环次同步振荡模式在复平面上靠近时,系统的闭环稳定性将会下降;运用残差理论能成功预测开环模式谐振条件下闭环模式的位置,而改变风机参数或调整串补度可以规避动态交互的发生。文中通过算例系统验证了上述理论分析的正确性,证明了直驱风电场通过串补输电线路进行输电时存在一定的失稳风险,能在一定程度上为串补输电系统的参数整定提供借鉴。

    Abstract:

    With the continuous expansion of power grid scale, the phenomenon of subsynchronous oscillation caused by series compensated long-distance transmission system occurs frequently. Therefore, in order to analyze the deep reasons for the instability of the series compensated transmission system, based on the open-loop mode resonance theory, an open-loop mode resonance analysis method is proposed to analyze the subsynchronous oscillation caused by the series compensated transmission line. The small signal model of the external series compensated transmission line of permanent magnet synchronous generator (PMSG) farm is established, and the dynamic interaction between the series compensated line and the PMSG farm is studied through the open-loop mode resonance analysis method. The results show that the closed-loop stability of the system decreases when the open-loop subsynchronous oscillation mode dominated by series compensation is close to the open-loop subsynchronous oscillation mode dominated by wind farm in the complex plane. Using residual theory can successfully predict the position of closed-loop mode under the condition of open-loop mode resonance, while changing PMSG parameters or adjusting series compensation can avoid the occurrence of dynamic interaction. The correctness of the above theoretical analysis is verified by an example system in this paper. It is proved that there is a certain risk of instability when the PMSG farm transmits power through the series compensation transmission line, which can provide a reference for the parameter setting of the series compensation transmission system to a certain extent.

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引用本文

刘文元,任必兴,李海峰,王海风,王洋.直驱风电场和串补之间的次同步振荡风险[J].电力工程技术,2022,41(4):25-32

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历史
  • 收稿日期:2022-01-19
  • 最后修改日期:2022-04-29
  • 录用日期:2021-10-13
  • 在线发布日期: 2022-07-20
  • 出版日期: 2022-07-28