Voltage droopcontrol is a common controlstrategy for multi-terminal HVDC transmission systems, while the traditional voltage droopcontrolstrategy has problems, such as large DC voltage fluctuations and unbalanced ...
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Voltage droopcontrol is a common controlstrategy for multi-terminal HVDC transmission systems, while the traditional voltage droopcontrolstrategy has problems, such as large DC voltage fluctuations and unbalanced power distribution. To maintain the voltage stability of mmc-mtdcsystem and the power balance between the converter stations, an improveddroopcontrolstrategy is proposed in this paper. The droop coefficient is designed by comparing the measured value of the multi-terminal direct-current voltage with the reference value of voltage. The fourterminal mmc-mtdc simulation model is built in PSCAD/Emtdc, and the proposed controlstrategy is simulated and verified under both transient and steady state conditions. The results show that the proposed controlstrategy can reduce the DC voltage deviation of mmc-mtdcsystem and improve the reliability and stability of the system. The correctness and effectiveness of the proposed method are verified.
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