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Design of Robust Damping Controller for VSC-MTDC System Considering DC Circuit Breaker

College of New Energy, China University of Petroleum (East China), Qingdao 266580, China

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This work is supported by National Natural Science Foundation of China (No. 51777216) and Shandong Provincial Natural Science Foundation of China (No. ZR2018MEE040, No. ZR2019MEE094).

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    DC circuit breaker (DCCB) is a key device for clearing DC faults in voltage source converter based multi-terminal DC (VSC-MTDC) system. Most DCCB systems require to connect DC reactor in series to limit the rising rate of the fault current, but large-capacity DCCB connecting DC reactor in series could decrease the damping of DC system and reduce the stability of multi-terminal DC system. In this paper, a small-signal mathematical model for VSC-MTDC system with DC breakers is constructed and modal analysis is performed to illustrate the main factors which could affect the system stability. To solve the stability problem caused by the circuit breaker system, a damping controller based on H hybrid sensitivity theory is designed to improve the weak damping characteristics of the system. Finally, with a four-terminal VSC-MTDC model implemented in MATLAB/Simulink, time-domain simulation and eigenvalue analysis results show that the proposed approach can efficiently suppress the DC system oscillations and improve the system stability. Compared with other traditional damping controllers, it is more applicable in scenarios with strong disturbances and uncertainties.

    表 1 开闭环模式系统特征根对比Table 1 System eigenvalue comparision in open-loop mode and closed-loop mode
    图1 混合灵敏度优化标准结构Fig.1 Standard structure of hybrid sensitivity optimization
    图2 四端MTDC系统拓扑Fig.2 Topology of four-terminal MTDC system
    图3 振荡模态特征根轨迹Fig.3 Trajectories of eigenvalues in critical modes
    图4 鲁棒阻尼控制器暂态性能验证Fig.4 Transient performance verification of robust damping controller
    图5 鲁棒阻尼控制器鲁棒稳定性验证Fig.5 Robust stability verification of robust damping controller
    表 2 Table 2
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MA Wenzhong,ZHOU Guanyu,SUN Peng,et al.Design of Robust Damping Controller for VSC-MTDC System Considering DC Circuit Breaker[J].Automation of Electric Power Systems,2020,44(6):84-90.DOI:10.7500/AEPS20190411002

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  • Received:April 11,2019
  • Revised:September 08,2019
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  • Online: March 21,2020
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