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含混合型MMC的四端柔性直流电网改进自适应重合闸策略
作者:
作者单位:

1.强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市 430074;2.思克莱德大学电气与电子工程学院,格拉斯哥 G1 1XW,英国;3.特变电工新疆新能源股份有限公司,新疆维吾尔自治区乌鲁木齐市 830011

摘要:

柔性直流电网是进行大规模新能源远距离架空线传输的重要技术手段。但架空线比直流电缆更容易发生瞬时性短路故障,待故障消失后需迅速重合闸。若直流电网发生永久性故障,常规基于换流器主动信号注入的故障性质判别方法易对直流电网的稳定运行产生较大干扰。针对上述问题,提出一种基于混合型模块化多电平换流器(MMC)主动信号注入的柔性直流电网改进型自适应重合闸方法,在混合型MMC极控制器中附加主动信号控制,使柔性直流电网在不中断功率传输的前提下实现故障性质辨识。此方法具备较强的耐过渡电阻能力,且不影响柔性直流电网功率传输的稳定性。在PSCAD/EMTDC搭建了混合型MMC四端柔性直流电网的电磁暂态模型,通过仿真验证了该方法在配备混合型MMC和机械式直流断路器的柔性直流电网中的有效性。

关键词:

基金项目:

国家自然科学基金资助项目(51807071);国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766211)。

通信作者:

作者简介:

蔡普成(1994—),男,硕士研究生,主要研究方向:柔性直流输电系统保护与控制。E-mail:caipucheng@foxmail.com
向往(1990—),男,在博士后工作站进行研究,主要研究方向:柔性直流输电技术、直流电网、交直流电网运行与控制等。E-mail:xiangwang1003@foxmail.com
周猛(1988—),男,通信作者,在博士后工作站进行研究,主要研究方向:直流输电技术。E-mail:zhoumeng4077@foxmail.com


An Improved Adaptive Reclosing Strategy of Four-terminal Flexible DC Grid with Hybrid Modular Multilevel Converter
Author:
Affiliation:

1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China;2.Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, G1 1XW, UK;3.TBEA China Xinjiang Sunoasis Co., Ltd., Urumchi 830011, China

Abstract:

The flexible DC grid is an important technical measure for large-scale long-distance overhead line transmission of renewable energy. However, overhead lines are more prone to instantaneous short-circuit faults than DC cables, and they need to be reclosed quickly after the fault is cleaned. If a permanent fault occurs in the DC grid, the conventional fault identification method based on the active signal injection of the converter is likely to cause great interference to the stable operation of the DC grid. To solve these problems, an improved adaptive reclosing strategy with active signal injection of the hybrid modular multilevel converter (MMC) for flexible DC grids is presented. Active signal control is added to the hybrid MMC pole controller, so that the flexible DC grid can realize the identification of the fault properties without interrupting the power transmission. This method has strong resistance to transition resistance and does not affect the power transmission stability of the flexible DC grid. The electromagnetic transient model of the four-terminal flexible DC grid with hybrid MMC is built in PSCAD/EMTDC. The simulations verify the effectiveness of the method in the flexible DC grid equipped with hybrid MMC and mechanical DC circuit breakers.

Keywords:

Foundation:
This work is supported by National Natural Science Foundation of China (No. 51807071) and National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid (No. U1766211).
引用本文
[1]蔡普成,向往,周猛,等.含混合型MMC的四端柔性直流电网改进自适应重合闸策略[J].电力系统自动化,2020,44(22):87-93. DOI:10.7500/AEPS20191011005.
CAI Pucheng, XIANG Wang, ZHOU Meng, et al. An Improved Adaptive Reclosing Strategy of Four-terminal Flexible DC Grid with Hybrid Modular Multilevel Converter[J]. Automation of Electric Power Systems, 2020, 44(22):87-93. DOI:10.7500/AEPS20191011005.
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  • 收稿日期:2019-10-11
  • 最后修改日期:2020-05-05
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  • 在线发布日期: 2020-11-18
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