具有儲能功能的模塊化多電平換流器的控制方法

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具有儲能功能的模塊化多電平換流器的控制方法

郭捷1,2，胡鵬飛2，周月賓2，林志勇2

(1. 國網河北省電力公司電力科學研究院，河北石家莊050021；2. 浙江大學電氣工程學院，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：研究具有儲能功能的模塊化多電平換流器的控制方法，將模塊化多電平換流器與電池儲能系統相結合，適用于離岸風電場接入電力系統等柔性直流輸電應用。系統在模塊化多電平換流器的基礎上，在子模塊直流側加入蓄電池實現儲能。換流器兩側均可等效為受控電壓源，可在儲能容量范圍內對直流側饋入功率起到平滑作用。運行時，換流器交流側有功無功電流解耦控制實現交流功率控制，換流器直流側直流電流控制實現直流功率控制，給出子模塊SOC控制方法和子模塊組SOC控制方法實現系統中大量蓄電池SOC的平衡控制。計算機仿真分析表明，提出的系統可實現交直流功率控制和儲能功能。

關鍵詞：模塊化多電平換流器(MMC)；柔性直流輸電系統；蓄電池儲能系統；離岸風電場接入；SOC平衡控制

文章編號：1007-2322(2015)05-0073-06

中圖分類號：TM721.1

收稿日期：2014-10-20

作者簡介：

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

模塊化多電平換流器(modular multilevel converter，MMC)自提出[1-3]以來，得到了人們越來越多的重視和研究，包括MMC的數學模型[4-6]、控制方法[1-3, 7]和硬件結構[8]等?；贛MC的柔性直流輸電作為其在電力系統中的重要應用，具有如下優點：子模塊的串聯結構可以提高換流器的額定電壓和容量，從而提高了柔性直流輸電系統的額定電壓和容量；換流器中可以安排冗余子模塊，使換流器的可靠性大幅提高；……