发电技术 ›› 2018, Vol. 39 ›› Issue (3): 233-239.DOI: 10.12096/j.2096-4528.pgt.2018.035

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三端背靠背柔性直流输电的虚拟同步发电机控制策略及其在配电网中的应用

邹丹1(),艾欣1(),王奥1(),王坤宇1(),黄仁乐2(),陈乃仕3(),蒲天骄3()   

  1. 1 新能源电力系统国家重点实验室(华北电力大学), 北京市 昌平区 102206
    2 国网北京市电力公司, 北京市 东城区 100002
    3 中国电力科学研究院有限公司, 北京市 海淀区 100192
  • 收稿日期:2018-01-23 出版日期:2018-06-30 发布日期:2018-07-27
  • 作者简介:邹丹(1993),女,硕士研究生,研究方向为新能源电力系统, 446442854@qq.com|艾欣(1964),男,博士,教授,博士生导师,主要研究方向为新能源电力系统及微网, x.ai@163.com|王奥(1992),女,硕士研究生,研究方向为新能源电力系统, 1906156552@qq.com|王坤宇(1991),男,博士研究生,研究方向为电力系统分析与控制, wky_ncepu@163.com|黄仁乐(1963),男,教授级高级工程师,主要研究方向为电力系统自动化、智能配电网关键技术, h979@sohu.com|陈乃仕(1980),男,硕士,高级工程师,主要研究方向为电力调度自动化、主动配电网, chennaishi@epri.sgcc.com.cn|蒲天骄(1970),男,教授级高级工程师,主要研究方向为电力系统自动化、智能电网仿真与控制、主动配电网技术研究与项目管理, tjpu@epri.sgcc.com.cn
  • 基金资助:
    国家高技术研究发展计划项目(863计划)(2015AA050102)

Virtual Synchronous Generator Control Strategy of Three Terminal Back-To-Back Voltage Source Converter Based HVDC and Its Application in Distribution Network

Dan ZOU1(),Xin AI1(),Ao WANG1(),Kunyu WANG1(),Renle HUANG2(),Naishi CHEN3(),Tianjiao PU3()   

  1. 1 State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University), Changping District, Beijing 102206, China
    2 State Grid Beijing Electric Power Corporation, Dongcheng District, Beijing 100002, China
    3 China Electric Power Research Institute, Haidian District, Beijing 100192, China
  • Received:2018-01-23 Published:2018-06-30 Online:2018-07-27
  • Supported by:
    Project Supported by the National High Technology Research and Development of China (863 Program)(2015AA050102)

摘要:

探讨了一种在10 kV配电网中引入三端背靠背(back-to-back,BTB)柔性直流输电(voltage source converter based HVDC,VSC-HVDC)系统的接线方案,通过VSC-HVDC的控制实现提高供电可靠性和抑制环流的目的。VSC-HVDC系统中换流站在传统控制模式下几乎没有转动惯量,难以有效地参与电网调节。为了提高电网受端系统频率的稳定性,改善系统发生故障后的运行特性,在中压(10 kV)交流配电网的背景下,提出了虚拟同步发电机(virtual synchronous generator,VSG)控制策略在三端BTB VSC-HVDC系统中的应用。首先在10 kV系统中加入三端BTB VSC-HVDC互联装置建立交直流混合配电网,建立换流站在传统控制和VSG控制下的数学模型,然后通过PSCAD/EMTDC平台进行仿真,在2种控制方式下得到系统在受到扰动和发生故障时的运行特性。结果表明,三端BTB VSC-HVDC系统受端换流器使用VSG控制能有效地参与电网调节,增加系统惯性,改善系统的暂态特性,提高电网运行的可靠性。

关键词: 虚拟同步发电机, 转动惯量, 背靠背柔性直流, 配电网

Abstract:

A kind of connection scheme of three-terminal back-to-back (BTB) voltage source converter based HVDC(VSC-HVDC) system in 10 kV distribution network was discussed, which can improve the reliability of power supply and restrain the circulation by the control of VHC-HVDC. With the traditional control strategies, VSC-HVDC system has almost no interia and is hard to be involved in the dynamic regulation of the power system effectively. To improve the stability of the frequency in the receiving system and improve the performance of the system after the breakdown, the control strategy of virtual synchronous generator (VSG) in the application of three terminal back-to-back VSC-HVDC under a medium voltage (10 kV) AC distribution network context was proposed. First three terminal back-to-back VSC-HVDC device was added to the 10 kV system to establish the AC/DC hybrid distribution network, and the mathematical model of the converter under the traditional control and VSG control was established. Then the simulation was carried out by using the PSCAD/EMTDC platform, the operating characteristics of disturbance and fault were obtained in two control modes. The results show that the three-terminal back-to-back VSC-HVDC system can effectively participate in the regulation of power grid system using VSG control, and gain the interia to improve the system's performances of transient states, and the reliability of the grid are effectively improved.

Key words: virtual synchronous generator (VSG), interia, back-to-back voltage source converter based HVDC, distribution network