适用于微网中储能变换器的并网开关控制策略  

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

作　　者：魏妍萍 王军 李南帆 师长立 WEI Yanping;WANG Jun;LI Nanfan;SHI Changli(State Grid Beijing Chengqu Power Supply Company,Beijing 100031,China;Institute of Engineering Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[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

出　　处：《储能科学与技术》2022年第1期156-163,共8页Energy Storage Science and Technology

基　　金：国网北京市电力公司科技项目(52020220004B)。

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。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.

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 

分 类 号：TM911[电气工程—电力电子与电力传动]