Research on starting control strategy of hybrid-DC transmission system based on line polarity switching

2018 International Conference on New Energy and Future Energy System

Chen, J.S.^1 ; Yang, W.Z.^1 ; Sun, S.Y.^1 ; Song, Y.^1

EHV Transmission Bureau of Liuzhou, Liuzhou, Guangxi

545006, China^1

关键词: Control strategies;    DC transmission systems;    HVDC transmission system;    Polarity switching;    Start-up process;    Starting control;    Topology structure;    Voltage source converters;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012111/pdf
DOI  :  10.1088/1755-1315/188/1/012111

来源: IOP

【 摘 要 】

The paper presented two kinds of typical topology structures of hybrid-DC transmission system along with the principle of the voltage source converter for the flexible DC transmission system. After that, the paper found that the flexibility of DC voltage in the start-up process should be restricted to an extent due to the unidirectional mobility of the HVDC transmission system. Therefore, the traditional start-up control method can not be directly applied in the starting process of the hybrid-DC transmission system. To solve this problem, the paper proposed a starting control strategy based on DC line polarity switching, which is reliable for hybrid HVDC transmission. Finally, the effect of the control strategy is verified by simulation.