Coordinated Control Strategy of VSC-MTDC System Under Different Power Dispatching Modes

doi:10.3969/j.issn.1000-7229.2017.08.009

Abstract

Abstract: ABSTRACT： Aiming at the real-time power flow distribution requirement of DC power system in three kinds of dispatching modes, this paper designs a coordinated control strategy for voltage source converter multi-terminal direct current （VSC-MTDC） system, which can change the value of droop coefficient and switch control mode to meet the DC power flow distribution. In order to avoid frequent switching of the control mode, a hysteresis comparator is added to the controller of the receiving end converter station. In the end, this paper constructs a four-terminal VSC-MTDC mode in PSCAD/EMTDC, and simulates the DC grid in different scheduling modes. The results show that, compared with the traditional control method with constant droop coefficient, this coordinated control strategy can meet the real-time power flow distribution requirements of the power system, and the transmission flexibility of the DC power grid is improved.

Key words: multi-terminal direct current （MTDC）, power dispatching, DC network, power flow distribution, hysteresis comparator

CLC Number:

TM 72

DENG Qi, ZHANG Yingmin, LI Zhihan.

Coordinated Control Strategy of VSC-MTDC System Under Different Power Dispatching Modes

[J]. Electric Power Construction, 2017, 38(8): 67-.

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