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Small-signal Stability Limit of a Grid-connected PMSG Wind Farm Dominated by the Dynamics of PLLs
IEEE Transactions on Power Systems ( IF 6.6 ) Pub Date : 2020-05-01 , DOI: 10.1109/tpwrs.2019.2946647
Wenjuan Du , Wenkai Dong , Haifeng F. Wang

This paper presents a derivation of the small-signal stability limit of a grid-connected wind farm with M permanent magnet synchronous generators (PMSGs) as determined by the dynamics of phased locked loops (PLLs). The stability limit reveals the mechanism whereby the PLLs can destabilize the wind farm in the case of a weak grid connection. Computation of the derived stability limit is simple and obviates the need to establish a parametric model of the wind farm. The stability limit can approximately indicate the potential instability risk collectively posed by the PLLs in the wind farm. Case studies are presented to evaluate the analytical conclusions obtained and the derived small-signal stability limit. Application of the stability limit during the planning and operating stages of a grid-connected wind farm is also demonstrated. Various factors that can affect the stability of the wind farm, and that must be considered during planning and operation, are examined and useful conclusions are obtained. These factors include the length of the transmission line connecting the wind farm to the AC grid, the topology of the wind farm, the wind speed, and its distribution over the wind farm, as well as the parameters of the PLLs.

中文翻译:

由锁相环动力学主导的并网 PMSG 风电场的小信号稳定极限

本文介绍了由锁相环 (PLL) 的动态特性确定的具有 M 个永磁同步发电机 (PMSG) 的并网风电场的小信号稳定性极限的推导。稳定性极限揭示了在弱电网连接的情况下 PLL 可能破坏风电场稳定的机制。导出的稳定极限的计算很简单,并且不需要建立风电场的参数模型。稳定性极限可以大致表明风电场中 PLL 共同造成的潜在不稳定风险。案例研究用于评估获得的分析结论和导出的小信号稳定性极限。还演示了在并网风电场规划和运行阶段稳定性极限的应用。对影响风电场稳定性以及在规划和运行过程中必须考虑的各种因素进行了检查,并得出了有用的结论。这些因素包括将风电场连接到交流电网的传输线长度、风电场的拓扑结构、风速及其在风电场中的分布,以及 PLL 的参数。
更新日期:2020-05-01
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