链式储能系统电池侧二次脉动功率的抑制方法

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摘要链式变换器的电路结构适合应用于电池储能领域,然而单相变换器的本质决定了电池组与电网能量交换时有二次脉动功率,这将危害电池组的寿命。为了抑制传统链式储能系统电池侧的二次脉动功率,在电池与链式变换器之间插入一级双向升降压变换器,构成双级链式变换器。本文对比分析了传统单级链式与双级链式变换器在电池侧的功率脉动情况,提出双级链式变换器的控制策略,通过控制中间直流电容的电压纹波缓冲电池侧的功率脉动。仿真和实验结果验证了理论分析的正确性。

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	陈强
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关键词 ：链式变换器, 电池储能系统, 二次脉动功率, 升降压变换器

Abstract：Cascaded H-bridge converter is suitable for battery energy storage system. However, as a sort of single-phase converter, its essence determines that second-order ripple power will exist in the DC bus when power exchanging between battery and the power grid, which will be harm to battery life. In order to restrain the second-order ripple power of traditional cascaded H-bridge converter, a bi-directional Buck/Boost converter is added between battery and cascaded H-bridge converter, which forms two-stage cascaded H-bridge converter. This article compares and analyses the second-order ripple power of traditional and two-stage cascaded H-bridge converter at the battery and then proposes the control strategy. By controlling the ripple voltage of the middle capacitor, the ripple power at the battery side will be buffered. Simulation and experimental results verify the feasibility of the theory.

Key words： Cascaded H-bridge converter battery energy storage system second-order ripple power Buck/Boost converter

收稿日期: 2013-05-22 出版日期: 2015-05-25

PACS:

TM715

基金资助:国家863智能电网重大专项（2011AA05A111）,上海市科学基金（11dz1200204）资助项目

作者简介: 陈强男,1989年生,博士,研究方向为级联多电平电池储能系统。李睿男,1980年生,副教授,研究方向为储能系统、大功率变换器技术。

引用本文:

陈强, 李睿, 蔡旭. 链式储能系统电池侧二次脉动功率的抑制方法[J]. 电工技术学报, 2015, 30(8): 231-237. Chen Qiang, Li Rui, Cai Xu. Method of Second-Order Ripple Power Suppression for Battery in Cascaded H-Bridge Storage System. Transactions of China Electrotechnical Society, 2015, 30(8): 231-237.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I8/231

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