光伏场经柔直并网振荡稳定性分析与抑制方法研究
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TM712

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国家自然科学基金资助项目(52077144)


Oscillation stability analysis and mitigation method of photovoltaic field connected to the grid via VSC-HVDC
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    摘要:

    光伏场经柔直送出是未来电力系统发展的一个重要趋势,但是光伏与柔直系统之间的相互作用存在引发系统振荡失稳的风险。为此,文中建立光伏场经柔直并网的开环和闭环互联模型,基于开环模式谐振理论,分析光伏场子系统与柔直子系统之间的动态交互作用。当二者发生强交互作用时,可能会使相应的闭环振荡模式进入复平面右侧,进而引发系统振荡失稳。针对光伏场子系统与柔直子系统之间的交互失稳风险,可以通过调整主导环节的控制参数进行抑制;当控制参数无法调整时,文中提出一种对光伏单元附加阻尼控制器的抑制措施,调整光伏场子系统的开环振荡模式,使其在复平面远离柔直子系统的开环振荡模式,从而破坏模式谐振,使闭环系统稳定。文中通过仿真算例,验证了上述理论分析结果的正确性以及所提阻尼控制器的有效性。

    Abstract:

    Photovoltaic field connected to the grid via voltage source converter based high voltage direct current (VSC-HVDC ) transmission is an important trend in the future development of the power system,but there is a risk that the interaction between photovoltaic and VSC-HVDC system may trigger system oscillations and instabilities. So,the open-loop and closed-loop interconnection models of the photovoltaic field integrated into grid through VSC-HVDC are established. The dynamic interaction between the photovoltaic subsystem and the VSC-HVDC subsystem based on the open-loop mode resonance theory are analyzed. When a strong interaction between two subsystems occurs,it may cause the corresponding closed-loop oscillation mode to enter the right side of the complex plane and trigger system oscillation instability. The risk of interaction instability between the photovoltaic subsystem and the VSC-HVDC subsystem can be mitigated by adjusting the control parameters of the dominant link. If the control parameters can not be adjusted,an additional damping controller for the photovoltaic unit is proposed as an inhibitory measure,which destroys the mode resonance phenomenon by adjusting the open-loop oscillatory modes of the photovoltaic subsystem away from the open-loop oscillatory modes of the VSC-HVDC subsystem in the complex plane,so as to stabilise the closed-loop system. The correctness of the above theoretical analysis results and the superiority of the proposed damping controller are verified by the simulation examples.

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杜文娟,郝向坤,陈珏.光伏场经柔直并网振荡稳定性分析与抑制方法研究[J].电力工程技术,2024,43(3):2-11,51

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历史
  • 收稿日期:2023-12-05
  • 最后修改日期:2024-02-23
  • 录用日期:2023-12-22
  • 在线发布日期: 2024-05-23
  • 出版日期: 2024-05-28
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