Compensation Droop Control of MMC-MTDC Considering Line Voltage Drop

doi:10.3969/j.issn.1000-7229.2017.08.011

Abstract

Abstract: ABSTRACT： The traditional error control and droop control cannot achieve the floating control of power and voltage in MMC-MTDC （modular multilevel converter based multi-terminal DC transmission systems）. In order to make the system achieve the optimal operating state, this paper proposes the droop compensation control strategy. Firstly, we analyze the traditional control methods with fully considering the voltage drop caused by line impedance in the traditional control mode. Then, we compensate the voltage reference instruction of the droop curve for the voltage offset caused by the power deviation of the system. Finally, we construct a five terminal simulation model on PSCAD/EMTDC, and compare three control methods under the two conditions of steady state and transient state. The results show that the static deviation of power and voltage can be eliminated by changing the power of the system, and the voltage will not overshoot, which can ensure that the system is always running in the optimal state.

Key words: , modular multilevel converter （MMC）, multi-terminal DC transmission system （MTDC）, droop control, line voltage drop, power command modification

CLC Number:

TM 76

DONG Hui,SONG Pinggang, ZHOU Zhenbang. Compensation Droop Control of MMC-MTDC Considering Line Voltage Drop

[J]. Electric Power Construction, 2017, 38(8): 80-.

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