DC Voltage Adaptive Droop Control Strategy for a Hybrid Multi-Terminal HVDC System

Yingpei Liu, La Zhang and Haiping Liang
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Yingpei Liu: School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
La Zhang: School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
Haiping Liang: School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China

Energies, 2019, vol. 12, issue 3, 1-18

Abstract: To solve the problems of DC voltage control and power allocation in the hybrid multi-terminal high voltage direct current system effectively, a DC voltage adaptive droop control strategy based on DC voltage-current characteristics is proposed. Based on adjustment of the droop coefficient of the converter station, the proposed control strategy introduces the influence factor of the droop coefficient, which considers the dynamic power margin of the converter station according to the direction of DC current variation in the converter station. When changes in the hybrid multi-terminal high voltage direct current system power flow occur, the droop coefficient of the converter station can be adjusted by the influence factor of the droop coefficient, so that the converter station can participate in power regulation according to its own power regulating ability. Consequently, the proposed control strategy can reasonably allocate the active power and minimize the deviation of the DC voltage. Besides, the stability analysis of the proposed control strategy is also carried out. Simulation results have verified the feasibility and effectiveness of the proposed control strategy.

Keywords: adaptive droop control; deviation of the DC voltage; hybrid multi-terminal high voltage direct current system; influence factor of the droop coefficient; power margin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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