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PLL and Additional Frequency Control Constituting an Adaptive Synchronization Mechanism for VSCs
IEEE Transactions on Power Systems ( IF 6.6 ) Pub Date : 2020-11-01 , DOI: 10.1109/tpwrs.2020.3020725
Meiqing Zhang , Li Sun

Phase-locked loop (PLL) control provides a typical synchronization mechanism for voltage-source converters (VSCs) integrated into strong grids. However, such a synchronization mechanism is hardly adaptive to the high-impedance weak grid neither to the islanded grid. In the scope of low-inertia weak grid issues, additional frequency control is conceived as an effective way for VSC-based devices to improve the frequency dynamics. The involved two controls are studied in two separate areas. In fact, additional frequency control combined with PLL is an adaptive synchronization mechanism with the ability to adapt to impedance changes in the power grid, which allows VSCs to remain synchronization stability under either a strong, weak or islanded grid, as proved in this letter. Recognition of this synchronization mechanism offers a helpful insight into the stable operation of PLL-synchronized VSCs in different grid conditions.

中文翻译:

构成 VSC 自适应同步机制的 PLL 和附加频率控制

锁相环 (PLL) 控制为集成到强大电网中的电压源转换器 (VSC) 提供了典型的同步机制。然而,这种同步机制很难适应高阻抗弱电网和孤岛电网。在低惯性弱电网问题的范围内,额外的频率控制被认为是基于 VSC 的设备改善频率动态的有效方式。涉及的两个控件在两个不同的领域进行研究。事实上,与 PLL 相结合的附加频率控制是一种自适应同步机制,具有适应电网阻抗变化的能力,这使得 VSC 在强电网、弱电网或孤岛电网下都能保持同步稳定性,正如这封信中所证明的那样。
更新日期:2020-11-01
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