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首页> 外文期刊>Electric Power Components and Systems >Small-Signal Instability of PMSG Wind Farm Caused by the PLL Under the Condition of Near Strong Open-Loop Modal Resonance
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Small-Signal Instability of PMSG Wind Farm Caused by the PLL Under the Condition of Near Strong Open-Loop Modal Resonance

机译：在近强开环模态共振条件下，PLL引起的PMSG风电场小信号不稳定

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摘要

This paper investigates the small-signal instability risk brought about by a phase locked loop (PLL) in a grid-connected PMSG wind farm. The investigation is based on a closed-loop interconnected model, wherein, the PLL and the remainder of power system (ROPS) are modeled as two separate open-loop subsystems. Analysis indicates that the closeness of two open-loop oscillation modes separately from the PLL and ROPS subsystems on the complex plane is the modal condition of near strong open-loop modal resonance (NESMOR). When the bandwidth of a dynamic component of the wind farm is close to the bandwidth of the PLL, it is possible that the NESMOR occurs between the dynamic component and the PLL. Under the condition of NESMOR, dynamic interactions introduced by the PLL degrade the small-signal stability of the grid-connected wind farm. Under the condition of weaker grid connection, the impact of NESMOR becomes stronger to lead to more degradation of system small-signal stability. Study cases are presented to demonstrate and validate the analysis and conclusions made in the paper.
机译：本文研究了并网PMSG风电场中锁相环（PLL）带来的小信号不稳定风险。该研究基于闭环互连模型，其中，PLL和电力系统的其余部分（ROPS）被建模为两个单独的开环子系统。分析表明，在复杂平面上，与PLL和ROPS子系统分开的两个开环振荡模式的接近性是接近强开环模态谐振（NESMOR）的模态条件。当风电场的动态组件的带宽接近PLL的带宽时，NESMOR可能会在动态组件和PLL之间发生。在NESMOR的条件下，PLL引入的动态相互作用会降低并网风电场的小信号稳定性。在电网连接较弱的情况下，NESMOR的影响会增强，导致系统小信号稳定性进一步下降。提出了研究案例，以论证和验证本文的分析和结论。

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