| 引用本文: | 刘勇,雷延科,盘宏斌.一种直流微电网无母线电压偏移的均衡控制策略[J].电力系统保护与控制,2020,48(12):154-161. |
| LIU Yong,LEI Yanke,PAN Hongbin.A balancing control strategy for DC microgrid without bus voltage offset[J].Power System Protection and Control,2020,48(12):154-161 |
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| 摘要: |
| 为解决直流微电网中分布式储能系统存在的剩余容量(State Of Charge, SOC)不均衡问题，提出一种适用于孤岛直流微电网分布式储能的均衡控制策略。该方案采用对数形式设计参考电压函数，以单台储能单元的SOC与所有储能单元的SOC均值的比例作为对数函数输入，从而实现各储能单元充放电过程中，各参考电压相对于额定母线电压呈近似对称变化，继而实现无母线电压偏移的均衡控制。基于此提出利用储能单元的输出功率及其参考电压的比例关系简化了参数选取过程，通过李雅普诺夫第一法判断了系统的稳定性。最后，通过Matlab/Simulink仿真及实验验证了所提控制策略的正确性和实用性。 |
| 关键词: 直流微电网 分布式储能 SOC均衡 参考电压函数 稳定性分析 |
| DOI：10.19783/j.cnki.pspc.190941 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51577162) |
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| A balancing control strategy for DC microgrid without bus voltage offset |
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LIU Yong,LEI Yanke,PAN Hongbin
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(Xiangtan University, Xiangtan 411105, China)
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| Abstract: |
| In order to solve the problem of the unbalance of State of Charge (SOC) in a distributed energy storage system in DC microgrid, a balancing control strategy for distributed energy storage of an island DC microgrid is proposed. The scheme adopts a logarithmic form to design a reference voltage function, and takes the ratio of the SOC of a single energy storage unit and the SOC average of all energy storage units as a logarithmic function input. This means that the reference voltages vary approximately symmetrically with respect to the rated bus voltage in the charging and discharging process of each energy storage unit without the bus voltage offset. On this basis, the proportional relationship between the output power of the energy storage unit and its reference voltage is simplified to the parameter selection process. The stability of the system is judged by Lyapunov’s first method. Finally, the correctness and practicability of the proposed control strategy are verified by Matlab/Simulink and experiment. This work is supported by National Natural Science Foundation of China (No. 51577162). |
| Key words: DC microgrid distributed energy storage SOC balancing reference voltage function stability analysis |
