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电网技术  2018, Vol. 42 Issue (7): 2062-2072    DOI: 10.13335/j.1000-3673.pst.2018.0117
  支撑新能源跨区输送的新型电网技术 本期目录 | 过刊浏览 | 高级检索 |
柔性直流电网直流线路故障主动限流控制
周猛1, 向往1, 林卫星1, 2, 文劲宇1, 左文平1
1.强电磁工程与新技术国家重点实验室,电力安全与高效湖北省重点实验室(华中科技大学电气与电子工程学院),湖北省 武汉市 430074;
2.特变电工新疆新能源股份有限公司,新疆维吾尔族自治区 乌鲁木齐 830011
Active Current-Limiting Control to Handle Overhead Line Fault in DC Grid
ZHOU Meng1, XIANG Wang1, LIN Weixing1, 2, WEN Jinyu1, ZUO Wenping1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Lab (Huazhong University of Science and Technology), Wuhan 430074, Hubei Province, China;
2. TBEA China Xinjiang Sunoasis Co., Ltd., Urumqi 830011, Xinjiang Uyghur Autonomous Region, China
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摘要 针对架空线柔性直流电网线路故障,提出了基于混合型MMC的主动限流控制方法,从而降低对直流断路器开断速度、开断容量以及吸收能量的要求,减少直流电网建设成本、提高直流电网可利用率。该文首先研究了换流器的交/直流电压解耦可控性,给出了主动限流控制器的控制架构。为了解决直流故障穿越期间,桥臂电容电压可能会短时越限的问题,提出了在内环直流电流控制器附加直流电流指令动态限幅控制器的方案。提出了主动限流控制策略的一种优化手段—电流目标预设控制,分析了不同控制器延时对主动限流控制的影响。计及主动限流控制,研究了单换流器系统和直流电网故障前后直流故障电流演变机理。最后,分别在单换流器系统和直流电网系统中仿真验证了前文理论分析的正确性的有效性。
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周猛
向往
林卫星
文劲宇
左文平
关键词:  直流电网  线路故障  混合型换流器  直流断路器  主动限流控制    
Abstract: To handle line faults in a DC grid, this paper proposed a new method of active current-limiting control (ACLC) based on hybrid MMC. With this active control, breaking capacity requirement of DC circuit breaker (DCCB) will significantly decrease and DC gird investment will be reduced. Firstly, independent controllability of AC/DC voltage of converter is studied. The ACLC control architecture is proposed. To avoid overvoltage of capacitor on each arm during DC fault, a method of dynamically adjusting DC current thresholds is proposed. The ACLC optimization method, i.e., target predetermined control, is put forward. Impact of different controller delay time on the ACLC is analyzed. Transient evolution mechanisms of DC fault current are studied in a single converter system and in DC grid respectively. Finally, validity of the ACLC is verified.
Key words:  DC grid    Line fault    active converter    DCCB    active current-limiting control
收稿日期:  2018-01-15                出版日期:  2018-07-09      发布日期:  2018-07-09      期的出版日期:  2018-07-09
ZTFLH:  TM721  
作者简介:  周猛(1988),男,博士研究生,主要研究方向为直流输电等,E-mail:zhoumeng4077@foxmail. com;向往(1990),男,博士,通信作者,主要研究方向为柔性直流输电、直流电网等,E-mail: xiangwang1003@foxmail.com;林卫星(1986),男,博士,主要研究方向为直流输电、直流电网、MMC,E-mail:weixinglin@foxmail.com;文劲宇(1970),男,教授,博士生导师,主要研究方向为电力系统运行与控制、直流输电等,E-mail:jinyu.wen@hust.edu.cn;左文平(1988),男,博士,主要研究方向为直流输电等,E-mail:radio.zuo@foxmail.com。
引用本文:    
周猛, 向往, 林卫星, 文劲宇, 左文平. 柔性直流电网直流线路故障主动限流控制[J]. 电网技术, 2018, 42(7): 2062-2072.
ZHOU Meng, XIANG Wang, LIN Weixing, WEN Jinyu, ZUO Wenping. Active Current-Limiting Control to Handle Overhead Line Fault in DC Grid. POWER SYSTEM TECHNOLOGY, 2018, 42(7): 2062-2072.
链接本文:  
http://www.dwjs.com.cn/CN/10.13335/j.1000-3673.pst.2018.0117  或          http://www.dwjs.com.cn/CN/Y2018/V42/I7/2062
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