Abstract
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.
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