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SONG Pinggang,DONG Hui,ZHOU Zhenbang.Adaptive Droop Control Strategy for MMC-MTDC Based on OPF[J].JOURNAL OF POWER SUPPLY,2019,17(2):92-100
Adaptive Droop Control Strategy for MMC-MTDC Based on OPF
Received:June 19, 2017  Revised:July 18, 2018
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DOI:10.13234/j.issn.2095-2805.2019.2.92
Keywords:multi-terminal DC transmission system  line loss  adaptive droop control  trade-off coefficient  optimal power allocation
Fund Project:Key technology research of novel traction power supply system based
        
AuthorInstitutionEmail
SONG Pinggang School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China
DONG Hui School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China donghuieasy@163.com
ZHOU Zhenbang School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China
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Abstract:
      The traditional droop control cannot solve the coordinated allocation problem of power margin for a converter station and the system power in a modular multilevel converter multi-terminal DC(MMC-MTDC) transmission sys-tem. Accordingly, an adaptive droop control strategy based on optimal power flow is proposed in this paper. First, an adaptive droop controller is designed according to the change in voltage direction and real-time margin. Then, the defect of the traditional droop control, i.e., it cannot solve the voltage deviation resulting from the DC line impedance in MTDC, is analyzed. In consideration of factors that affect the power flow in the DC network, the constraint conditions and objective function are constructed to obtain the droop coefficient of power flow optimal allocation. Finally, the proportions of two kinds of droop curves are allocated by calculating the trade-off coefficient in real-time with DC voltage deviations. A five-terminal MMC model is established in PSCAD/EMTDC, and two control methods are compared in steady-and transient-state working conditions. Results show that the proposed control strategy can avoid full load on the converter station and reduce the line loss, thus achieving optimal power allocation of the system.
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