储能科学与技术 ›› 2022, Vol. 11 ›› Issue (1): 156-163.doi: 10.19799/j.cnki.2095-4239.2021.0271

• 储能系统与工程 • 上一篇    下一篇

适用于微网中储能变换器的并网开关控制策略

魏妍萍1(), 王军1, 李南帆1(), 师长立2   

  1. 1.国网北京城区供电公司,北京 100031
    2.中国科学院电工研究所,北京 100190
  • 收稿日期:2021-06-17 修回日期:2021-08-22 出版日期:2022-01-05 发布日期:2022-01-10
  • 通讯作者: 李南帆 E-mail:wyp0012021@163.com;2534694993@qq.com
  • 作者简介:魏妍萍(1974— ),女,硕士,高级工程师,主要研究方向为微网、储能关键技术及装备,E-mail:wyp0012021@163.com|李南帆,工程师,主要研究方向为储能关键技术及装备,E-mail:2534694993@qq.com
  • 基金资助:
    国网北京市电力公司科技项目(52020220004B)

Grid-connected switch control strategy suitable for energy storage converter in microgrid

Yanping WEI1(), Jun WANG1, Nanfan LI1(), Changli SHI2   

  1. 1.State Grid Beijing Chengqu Power Supply Company, Beijing 100031, China
    2.Institute of Engineering Chinese Academy of Sciences, Beijing 100190, China
  • Received:2021-06-17 Revised:2021-08-22 Online:2022-01-05 Published:2022-01-10
  • Contact: Nanfan LI E-mail:wyp0012021@163.com;2534694993@qq.com

摘要:

本文针对微网中储能变换器的并网开关控制问题进行了深入研究,深入分析了可控硅整流器(silicon controlled rectifier,SCR)开关的过零关断特性造成的关断延迟对本地负荷造成的影响。为保证本地负荷供电稳定、可靠,本文利用现有条件,提出SCR强制关断控制策略,该策略仅通过软件控制策略迫使流过SCR的电流迅速下降为零,从而实现了并网开关的强制关断。同时,本文对影响关断时间的因素进行了深入研究,得出了本地负荷电压与并网电流的变换关系。该技术可以很好地保证并离网切换过程中负荷的用电安全,同时避免了切换过程中并网电流对电网的冲击。最后,搭建实验平台,开展相关实验,实验结果证明了本文理论分析以及所提强制关断策略的合理性和有效性。

关键词: 储能变换器, 可控硅整流器, 无缝切换控制, 强制关断策略

Abstract:

An in-depth study is conducted on the grid-connected switch control problem suitable for the seamless switching control of a microgrid. Moreover, the influence of the zero-crossing turn-off characteristics of the silicon-controlled rectifier (SCR) switch on the local load is analyzed. The SCR forced shutdown control strategy is proposed to ensure the stability and reliability of the local load power supply. This study also investigates the factors affecting the turn-off time and obtains the transformation relationship between the local load voltage and the grid-connected current. Finally, an experimental platform is built, and related experiments are performed. The experimental results prove the rationality and the effectiveness of the theoretical analysis and the strategies proposed herein. In summary, the proposed strategy can ensure well the safety of the load's power consumption during the on-grid/off-grid switching process of the microgrid.

Key words: microgrid, SCR, seamless switching control, forced shutdown control strategy

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