DC Voltage Control and Power Dispatch Strategy of a Five-Terminal VSC-Based DC Grid

doi:10.3969/j.issn.1000－7229.2015.04.009

Abstract

Abstract:

DC grids based on voltage source converters （VSCs） have been proposed for integrating large wind farms and delivering remote energy source power through long distance. A number of DC voltage control and power dispatch strategies have been presented by researchers to guarantee the power transmission’s flexibility and capacity of such DC grids. Based on the analysis on the advantages and disadvantages of DC voltage margin control strategy and DC voltage droop control strategy, a novel control strategy was proposed to achieve the goal of both precise DC voltage tracking under normal operation and steady control mode conversion after slack-bus terminal loss. Based on PSCAD/EMTDC simulation platform, a mean value model of a five-terminal VSC-based DC grid with four onshore AC systems and one offshore DC system was built. Through the comparison on the steady-state and dynamic-state characteristics of the DC grid under wind power variation, main converter station tripping and other conditions, the validity and advantages of the proposed control strategy were verified.

Key words: voltage control, power dispatch, voltage margin control, voltage droop control, master-droop control

CLC Number:

TM 721.1

WANG Kai, SUN Haishun, HU Xiaobo, ZHANG Ke. DC Voltage Control and Power Dispatch Strategy of a Five-Terminal VSC-Based DC Grid[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(4): 52-58.

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