具有储能型子模块的MMC拓扑结构与控制系统设计  

MMC Topology and Control System Design with Energy Storage Sub-Modules

作　　者：陈雪菲 冯艺原 CHEN Xuefei;FENG Yiyuan(Chengdu Chengdian Electric Power Engineering Design Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]成都城电电力工程设计有限公司,四川成都610000

出　　处：《自动化仪表》2025年第3期75-80,共6页Process Automation Instrumentation

摘　　要：为了解决现有方法不能实现模块化多电平换流器(MMC)与储能系统(ESS)之间解耦控制和各子模块功率的独立控制问题,提出了一种具有多级直流-直流(DC-DC)变换器的MMC储能型子模块结构。首先,基于子模块内不同子变换器运行时的等效电路,建立了子模块平均值模型。该模型能够反映子模块内电压、电流间的交互特性。然后,基于平均值模型设计了各子变换器的控制系统,并集成于MMC本体控制系统中。仿真结果显示,在引入交流滤波环节后,ESS电压、电流特性得到了明显改善,ESS电压和功率在开启控制后渐进一致,说明了变换器模型及其控制策略的有效性。该设计可实现子模块电容和ESS的独立功率控制,并可避免两者间的谐波穿越,从而增加了ESS的运行寿命。To solve the problems of decoupling control between modular multilevel converter(MMC)and energy storage system(ESS)and independent control of the power of each sub-module,which cannot be realized by the existing methods,a sub-module structure of the MMC energy storage type with a multilevel direct current-direct current(DC-DC)converter is proposed.Firstly,a sub-module average value model is established based on the equivalent circuits of different sub converters operating within the sub-module.The model can reflect the interaction characteristics between voltage and current within the sub-module.Then,the control system of each sub converter is designed based on the average value model and integrated into the MMC body control system.The simulation results show that the ESS voltage and current characteristics are significantly improved after the introduction of the alternating current filtering link,and the ESS voltage and power are asymptotically consistent after the control is turned on,which illustrates the effectiveness of the converter model and its control strategy.The design can realize the independent power control of the sub-module capacitor and the ESS,and avoid the harmonic crossing between them,so as to increase the operating life of the ESS.

关 键 词：柔性直流输电 模块化多电平换流器 储能系统 储能型子模块 直流-直流变换器 控制策略 

分 类 号：TH-39[机械工程]