具有储能功能的模块化多电平换流器的控制方法  

Control Strategy for Modular Multilevel Converter With Energy Storage Ability

作　　者：郭捷[1,2] 胡鹏飞[2] 周月宾[2] 林志勇[2] 

机构地区：[1]国网河北省电力公司电力科学研究院,河北石家庄050021 [2]浙江大学电气工程学院,浙江杭州310027

出　　处：《现代电力》2015年第5期73-78,共6页Modern Electric Power

摘　　要：研究具有储能功能的模块化多电平换流器的控制方法,将模块化多电平换流器与电池储能系统相结合,适用于离岸风电场接入电力系统等柔性直流输电应用。系统在模块化多电平换流器的基础上,在子模块直流侧加入蓄电池实现储能。换流器两侧均可等效为受控电压源,可在储能容量范围内对直流侧馈入功率起到平滑作用。运行时,换流器交流侧有功无功电流解耦控制实现交流功率控制,换流器直流侧直流电流控制实现直流功率控制,给出子模块SOC控制方法和子模块组SOC控制方法实现系统中大量蓄电池SOC的平衡控制。计算机仿真分析表明,提出的系统可实现交直流功率控制和储能功能。A control strategy for modular multilevel convert- er （MMC） with energy storage ability is proposed for such flexible DC transmission application as power system con- nected with offshore wind farm. In the main circuit, battery banks are set in each sub-model of MMC. The DC terminal and AC terminal of converter are equivalent to controlled voltage sources, and feed-in power at DC side is smoothed in the region of energy storage capacity. During operation, the decoupled control of active power current at AC side of con- verter can realize AC power control, and the direct current control at DC side of converter can regulate DC power. In addition, SOC control methods of sub-model and sub-model cluster are given to balance the battery SOC in system. The simulation results show that proposed system can realize power control and storage function of AC/DC current sys- tem, and its viability is also verified.

关 键 词：模块化多电平换流器(MMC) 柔性直流输电系统 蓄电池储能系统 离岸风电场接入 SOC平衡控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]