该文首先提出一种新型电池组动态串联均衡结构,集成变换器和均衡器。其次,基于该拓扑提出改进的低开关频率的最近电平控制策略,通过子模块电池单元荷电状态排序,输出多电平阶梯波,最终输出波形的电压谐波失真率较传统方法下降13.02%,且加入状态切换步骤,避免荷电状态缓变带来的子模块频繁投切。同时,引入混合变量的均衡控制方法,并分析设计电感、占空比等均衡参数,确保电池单元在投入使用前满足电压等级要求,同时缩小电池单元间荷电状态的差异。通过结构集成与控制策略优化,实现了电池储能系统效率与性能的提升。最后,在MATLAB中验证了所提拓扑与控制策略的有效性。
Abstract
In this paper, firstly a novel dynamic series equalization structure of the battery pack is proposed, which integrates a converter and equalizer. Secondly, based on this topology, an improved low switching frequency nearest level control strategy is proposed. By sorting the state of charge of the sub-module battery units, the multi-level step wave is output. The voltage harmonic distortion rate of the final output waveform is 13.02% lower than that of the traditional method, and the state switching step is added to avoid the frequent switching of the sub-modules caused by the slow change of the state of charge. At the same time, the equalization control method of mixed variables is introduced, and the equalization parameters such as inductance and duty cycle are analyzed and designed to ensure that the battery unit meets the voltage level requirements before it is put into use, and the difference in state of charge between the battery units is reduced. Through structural integration and control strategy optimization, the efficiency and performance of the battery energy storage system are improved. Finally, the effectiveness of the proposed topology and control strategy is verified in MATLAB.
关键词
电池储能系统 /
变换器 /
均衡器 /
动态串联结构 /
最近电平控制策略
Key words
battery energy storage system /
converter /
equalizer /
dynamic series structure /
nearest level control strategy
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基金
福建省科技厅引导性项目（2021H0024）
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