摘要
柔性多状态开关(FMSS)是一种取代传统联络开关应用于现代配电网的新型电力电子设备,能够优化现代配电网分布式电源的消纳和调控。和传统控制算法相比,采用VSG控制的FMSS不受弱电网环境下锁相环性能恶化的影响,在低电网强度下能够向电网提供频率支撑,从而增强系统的稳定性。FMSS作为接入配电网的装置,当电网电压发生三相不平衡现象时,传统VSG控制下的FMSS输出电流、功率会发生明显的波动,并网点的效率会大大降低。针对此问题,以模块化多电平变流器(MMC)结构为基础,在VSG控制策略的基础上引入正负序电流补偿,分别实现不平衡电网下FMSS输出电流、有功功率及无功功率的稳定。最后,通过Matlab/Simulink搭建四端FMSS模型,利用仿真验证所提控制策略的有效性。
Flexible multi-state switch(FMSS)is a new type of power electronic device that replaces traditional tie switches and is applied to modern distribution networks.It can optimize the consumption and regulation of distributed power sources in modern distribution networks.The FMSS controlled by VSG is not affected by the deterioration of phase-locked loop performance in weak power grid environments,it can provide frequency support to the grid at low grid strength,thus enhancing the stability of the system.As a device connected to the distribution network,FMSS,when there is three-phase imbalance in the grid voltage,the output current of FMSS under traditional VSG control will become unstable,and the power will also fluctuate significantly,greatly reducing the efficiency of the grid connection point.To address this issue,based on the modular multilevel converter(MMC)structure and the traditional VSG control strategy,positive and negative sequence current compensation was introduced to achieve the stability of FMSS output current,active power,and reactive power under unbalanced power grids.Finally,a four terminal FMSS model was built using Matlab/Simulink,and the effectiveness of the proposed control strategy was verified through the simulation.
作者
王正齐
魏炜
WANG Zhengqi;WEI Wei(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu,China;State Grid Yangzhou Power Supply Company,Yangzhou 225000,Jiangsu,China)
出处
《电气传动》
2024年第4期34-42,共9页
Electric Drive
基金
江苏省高校自然科学研究项目(18KJD470004)。
关键词
不平衡电网
柔性多状态开关
模块化多电平变流器
正负序电流补偿
unbalanced power grid
flexible multi-state switch(FMSS)
modular multilevel converter(MMC)
positive and negative sequence current compensation
作者简介
王正齐(1984—),男,博士研究生,副教授,主要研究方向为新型智能配电设备及其应用,Email:wzqnjit@163.com;通讯作者:魏炜(1998—),男,硕士研究生,主要研究方向为柔性多状态开关,Email:591682703@qq.com。
