Abstract
With unceasing increase of traditional HVDC transmission capacity, it became more and more obvious that the voltage supporting ability of receiving end power system restricts the development of HVDC power transmission, which also blocks the application of HVDC. This paper according to nodal impedance matrix, short-circuit ratios of the receiving end system under hierarchical connection mode and multi-terminal feed mode are derived. Besides, the voltage support capabilities of different modes are analyzed. The simulation was carried out and verified the feasibility and rationality of multi-terminal feed mode, which proved the UHVDC multi-terminal feed mode is helpful to increase the voltage support capability and enable the reasonable power flow distribution between 1000kV layer and 500kV layer.
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