Small-Signal Modelling of LCC-MMC Series Hybrid HVDC Transmission System
He Yongjie1, Xiang Wang2, Zhou Jiapei3, Zhao Jingbo4, Wen Jinyu1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW UK; 3. State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd Beijing 102209 China; 4. Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd Nanjing 211103 China
Abstract：This paper establishes the small-signal model of LCC-MMC series hybrid HVDC transmission system, which rectifier side is LCC and which inverter side is series connect of LCC and MMC. Firstly, equivalent circuits of the AC and DC sides of LCC and equivalent circuits of the AC and DC sides of MMC considering internal dynamic characteristics are derived. Then, models of the rectifier and inverter sides of the system are constructed based on equivalent circuits. By combining each part of the above, consisting of the DC line and control system, the entire system's model is obtained. Finally, the small-signal model of the entire system is obtained by linearizing the entire system's model. The accuracy of the small-signal model is verified by comparing the electromagnetic transient model based on PSCAD/EMTDC. The influences of the constant DC voltage control parameters of MMC and LCC in the inverter-side, PLL parameters, and the tie line parameters on the small-signal stability of the system are analyzed based on the small-signal model. The small-signal model of LCC-MMC series hybrid DC transmission system proposed in this paper can be used for the system's small-signal stability analysis, thereby providing a valuable reference for system design and parameter selection.
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2021, Vol. 36 
