Mingqun Liu

Mar 16, 2024 | mdpi.com | Chao Xing |Mingqun Liu |Junzhen Peng |Xueke Wang

1. IntroductionAfter asynchronous networking, the problem of low frequency oscillation caused by weak damping of the AC system in weakly interconnected large systems has been improved to a certain extent, but ultra-low-frequency oscillation occurs in non-synchronous hydropower high-proportion transmission systems. It has been shown that the ultra-low frequency oscillation of asynchronous network transmitter systems is mainly due to the water hammer effect of hydropower units.

Mar 8, 2024 | mdpi.com | Chao Xing |Mingqun Liu |Junzhen Peng |Yuhong Wang

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Mar 2, 2024 | mdpi.com | Chao Xing |Mingqun Liu |Junzhen Peng |Yuhong Wang

1. IntroductionCompared with the traditional line-commutated converter-based high-voltage DC transmission (LCC-HVDC) system, the VSC-MTDC system can achieve independent control of active power and reactive power without commutation failure. With the increase of power grid scale and the increasing demand for interconnection between different regional power grids, the interconnection mode based on the VSC-MTDC system has been widely used [1,2].

Mar 1, 2024 | mdpi.com | Chao Xing |Mingqun Liu |Junzhen Peng |Yuhong Wang

1. IntroductionUnder high-voltage DC (HVDC) transmission systems, island operation is the term applied when the sending-end system primarily consists of several major power plants and a cluster of sending-end converter stations [1,2]. The unique energy and load distribution characteristics inherent to HVDC transmission systems make them exceptionally well-suited for long-distance high-capacity transmission, leading to their widespread adoption.

Feb 13, 2024 | mdpi.com | Jhih-Jhong Wang |Chao Xing |Mingqun Liu |Junzhen Peng

All articles published by MDPI are made immediately available worldwide under an open access license. No specialpermission is required to reuse all or part of the article published by MDPI, including figures and tables. Forarticles published under an open access Creative Common CC BY license, any part of the article may be reused withoutpermission provided that the original article is clearly cited. For more information, please refer tohttps://www.mdpi.com/openaccess.