Abstract

DC line voltage drops as well as converter power losses have significant impacts on precise control of power flow in multiterminal VSC-HVDCs using DC voltage droop. When DC voltage droop controls are used in multiterminal VSC-HVDC, due to unequal DC bus voltages the DC line voltage drops causes large amount of power flow deviations in the DC network. DC line power losses and converter power losses also cause DC grid power flow deviations. To achieve precise control of power flow in the DC network, it is necessary that the power deviations occurring due to each of these factors be eliminated. With simulation of a five terminal VSC-HVDC system in PSCAD/EMTDC it is demonstrated how to achieve precise control of power flow in multiterminal VSC-HVDC by accounting for each of these three factors.

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