Analysis on the operating characteristic of UHVDC hierarchical connection mode to AC system

In this paper, the mathematical method of the MIIF (multi-infeed interaction factor) under UHVDC hierarchical connection mode is analyzed, and the correctness of the method is verified by PSCAD simulation. In hierarchical connection mode, it was analyzed that one inverter in a bus which has been in the condition of commutation failure has effect on another inverter in another bus with the change of MIIF.

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