文献标志码：A

具有储能功能的模块化多电平换流器的控制方法

郭捷1,2，胡鹏飞2，周月宾2，林志勇2

(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)

Control Strategy for Modular Multilevel Converter With Energy Storage AbilityGUO Jie1,2, HU Pengfei2, ZHOU Yuebin2, LIN Zhiyong2

(1. State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, China;

2. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

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。

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

文章编号：1007-2322(2015)05-0073-06

中图分类号：TM721.1

收稿日期：2014-10-20

作者简介：

Abstract：A control strategy for modular multilevel converter (MMC) with energy storage ability is proposed for such flexible DC transmission application as power system connected 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 converter 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 system, and its viability is also verified.

Keywords：modular multilevel converter(MMC); HVDC; battery energy storage system; the accessing of offshore wind farm; SOC balancing

0引言

模块化多电平换流器(modular multilevel converter，MMC)自提出[1-3]以来，得到了人们越来越多的重视和研究，包括MMC的数学模型[4-6]、控制方法[1-3, 7]和硬件结构[8]等。基于MMC的柔性直流输电作为其在电力系统中的重要应用，具有如下优点：子模块的串联结构可以提高换流器的额定电压和容量，从而提高了柔性直流输电系统的额定电压和容量；换流器中可以安排冗余子模块，使换流器的可靠性大幅提高；……