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考虑直流断路器的VSC-MTDC系统鲁棒阻尼控制器设计
作者:
作者单位:

中国石油大学(华东)新能源学院,山东省青岛市 266580

作者简介:

马文忠(1968—),男,博士,教授,博士生导师,主要研究方向:电力电子技术与智能电网技术等。E-mail:mawenzhong@126.com
周冠宇(1994—),男,硕士研究生,主要研究方向:柔性直流输电的分析与控制。E-mail:zhougy9413@qq.com
孙鹏(1996—),男,硕士研究生,主要研究方向:柔性直流输电、DC/DC变换器、非线性控制等。E-mail:sunpeng_96@163.com
董磊(1974—),男,通信作者,博士,讲师,研究方向为:电力电子技术与智能电网技术等。E-mail:pc-auto@163.com

通讯作者:

基金项目:

国家自然科学基金资助项目(51777216);山东省自然科学基金资助项目(ZR2018MEE040,ZR2019MEE094)。


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

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

Fund Project:

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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    摘要:

    直流断路器是多端柔性直流输电(VSC-MTDC)系统清除直流故障的关键设备。目前大多数直流断路器系统需要串联直流电抗器以限制故障电流变化率,而大容量直流电抗器与线路串联会抑制直流系统的阻尼,降低多端直流系统的稳定性。文中建立了含直流断路器的VSC-MTDC系统的小信号数学模型,并使用模态分析方法分析了影响系统稳定性的主要因素;针对断路器系统导致的稳定性问题,设计了基于H混合灵敏度理论的阻尼控制器以改善系统的弱阻尼特性。在MATLAB/Simulink中搭建了四端VSC-MTDC模型进行了仿真分析,时域仿真和特征值分析结果证明所提控制方法可以有效抑制直流系统振荡,提高系统稳定性,且相较于其他传统阻尼控制器,更适合系统存在较强扰动和不确定性的情景。

    Abstract:

    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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引用本文

马文忠,周冠宇,孙鹏,等.考虑直流断路器的VSC-MTDC系统鲁棒阻尼控制器设计[J].电力系统自动化,2020,44(6):84-90. DOI:10.7500/AEPS20190411002.
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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  • 收稿日期:2019-04-11
  • 最后修改日期:2019-09-08
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  • 在线发布日期: 2020-03-21
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