| 引用本文: | 徐云飞,肖湘宁,孙雅旻,龙云波,徐永海.级联双极型大容量电池储能系统及其控制策略[J].电力自动化设备,2016,36(8): |
| XU Yunfei,XIAO Xiangning,SUN Yamin,LONG Yunbo,XU Yonghai.Large-capacity cascaded bipolar BESS and its control strategy[J].Electric Power Automation Equipment,2016,36(8): |
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| 摘要: |
| 针对多储能单元级联的高电压、大容量应用场合，提出一种级联双级型电池储能系统。该系统由AC／DC与DC／DC两级变换器构成，且均采用模块化多电平级联结构，具有结构紧凑、可靠性高、能量控制简单等优点。建立该系统的数学模型并分析其工作原理及约束条件，设计了多电池组荷电状态（SOC）均衡策略，有效解决了电池过充或过放的问题；针对储能系统在不对称运行条件下直流电流波动过大的问题，提出一种直流波动抑制的前馈控制策略。最后，基于RTDS对该系统及控制策略进行数字-物理闭环仿真，验证了系统结构和控制策略的有效性。 |
| 关键词: 模块化多电平变换器 电池储能系统 SOC均衡策略 不对称补偿策略 数字-物理闭环仿真 |
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| 基金项目:国家高技术研究发展计划（863计划）资助项目（2011-AA05A113） |
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| Large-capacity cascaded bipolar BESS and its control strategy |
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XU Yunfei, XIAO Xiangning, SUN Yamin, LONG Yunbo, XU Yonghai
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State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources， North China Electric Power University，Beijing 102206，China
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| Abstract: |
| A cascaded bipolar BESS （Battery Energy Storage System） is proposed for the high-voltage and large-capacity applications of multiple cascaded energy storage units，which is composed of an AC／DC converter and a DC／DC converter. Both converters adopt the multilevel modular cascading structure，which is compact，highly reliable and simple for energy control. A mathematical model is built for the system，its working principle and constraints are analyzed，and the SOC（State of Charge） balancing strategy is designed for multiple battery packs to avoid the over-charging and over-discharging. Aiming at the large DC current fluctuation of BESS during its operation in asymmetric conditions，a feedward control strategy is proposed to smooth the DC current fluctuation. The digital-physical closed-loop simulation based on RTDS verifies the effectiveness of the proposed system structure and control strategies. |
| Key words: modular multilevel converter battery energy storage system SOC balancing strategy asymmetric compensation strategy digital-physical closed-loop simulation |
