适用于智能软开关配电系统的MMC多模态直接控制策略  

A Unified Direct Control Strategy for MMC Based on Soft Open Point Interconnection System

作　　者：董梅 DONG Mei(State Grid Jiangsu Power Co.,Ltd.,Suzhou Power Supply Branch,Suzhou 215004,China)

机构地区：[1]国网江苏省电力有限公司苏州供电分公司,江苏苏州215004

出　　处：《电工技术》2025年第2期134-139,145,共7页Electric Engineering

摘　　要：在配电网中使用智能软开关(Soft Open Point, SOP)可有效改善电能质量、提升新能源消纳水平。目前基于SOP配电系统中的模块化多电平换流器(MMC)广泛采用基于旋转坐标系的电压、电流解耦控制,但该控制方法难以满足三相不对称、线路故障与暂态工况下柔性互联系统对MMC换流器性能的要求,因此针对SOP的运行特点,提出一种基于SOP配电系统的MMC多模态直接控制策略。该策略统一了电流环基准的生成方式,简化了控制策略;通过切换电流环基准来加快多工况下MMC换流器运行模式的切换速度;重新定义了桥臂电压参考的生成方式,优化了MMC换流器的动态性能;通过仿真验证了所提控制策略的可靠性和有效性。Soft open point(SOP)technology can effectively improve the power quality of distribution network and enhance the level of new energy consumption.At present,the voltage and current decoupling control method based on the rotating coordinate system is widely used in the modular multilevel converter(MMC)in the distribution system based on SOP.However,this control method is difficult to meet the performance requirements of the MMC converter in the flexible interconnection system under three-phase asymmetry,line fault and transient conditions.Therefore,according to the operation characteristics of multi-terminal flexible interconnection system,this paper proposes a unified direct control strategy of MMC based on multi-terminal flexible interconnection system.This strategy unifies the generation mode of current loop reference and simplifies the control strategy.Switching current loop reference is used to speed up the switching speed of MMC operating mode under multiple working conditions.The generation mode of bridge arm voltage reference is redefined to optimize the dynamic performance of MMC device.The reliability and effectiveness of the proposed control strategy are verified by simulation.

关 键 词：SOP MMC换流器 多模态直接控制策略 运行模式切换 电流基准选择 

分 类 号：TM461.5[电气工程—电器]