Comprehensive Coordination Control Strategy for VSC-MTDC System

doi:10.3969/j.issn.1000-7229.2017.08.008

Abstract

Abstract: ABSTRACT： This paper proposes a comprehensive coordinated control strategy, which is aimed at the different degrees of unbalance power in DC network. The margin droop control strategy, which is considering both the voltage droop on DC line resistance and the power margin of converter station in the design of operating characteristic curve of droop control, is introduced in the active-power controller, to ensure the stability of DC voltage when the unbalanced power is too large or the converter station out of operation. Transient simulation and analysis by establishing a simulation model of the five-terminal flexible DC transmission system in PSCAD/EMTDC show that not only the proposed control strategy can optimize the power flow when there is a large unbalance power in the DC network, but also the DC voltage has a strong rigidity, and the stability of the VSC-MTDC （voltage source converter multi-terminal direct current） system also has been improved.

Key words: droop control, coordination control, DC resistance, power margin, optimal power flow

CLC Number:

TM 721

DENG Qi，ZHANG Yingmin，ZENG Qi，ZHANG Likui，LI Zhihan. Comprehensive Coordination Control Strategy for VSC-MTDC System

[J]. Electric Power Construction, 2017, 38(8): 59-.

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