| 引用本文: | 程子霞,丁青波,柴旭峥.基于改进下垂系数的SOC均衡下垂控制[J].电力系统保护与控制,2025,53(14):123-132.[点击复制] |
| CHENG Zixia,DING Qingbo,CHAI Xuzheng.SOC balancing droop control based on an improved droop coefficient[J].Power System Protection and Control,2025,53(14):123-132[点击复制] |
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| 摘要: |
| 为解决传统的下垂控制存在均分精度不足、无法合理分配电流、下垂系数的取值无限制以及电池荷电状态(state of charge, SOC)均衡速度慢的问题，提出一种基于改进下垂系数的SOC均衡下垂控制。首先，分析了传统幂指数形式下垂控制的缺陷，提出幂指数嵌套反正切函数的下垂系数形式，以此来限制下垂系数的取值进而提高控制系统的稳定性与可靠性。随后，针对SOC均衡速度较慢的问题，提出在下垂系数中引进增速因子Q来提升均衡速度，并分析了不同Q值对下垂曲线的影响。最后，搭建仿真模型对改进方法进行对比验证。仿真结果表明所提改进的SOC均衡速度在SOC差距较小时有较大提升。在SOC均衡的过程中，下垂系数的变化更平滑，母线电压在SOC差距较大时也不会发生较大振荡。 |
| 关键词: 下垂控制 下垂系数 SOC均衡 荷电状态 |
| DOI：10.19783/j.cnki.pspc.241223 |
| 投稿时间：2024-03-31修订日期：2024-08-25 |
| 基金项目:国家自然科学基金项目资助(52107130) |
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| SOC balancing droop control based on an improved droop coefficient |
| CHENG Zixia1,DING Qingbo1,CHAI Xuzheng2 |
| (1. School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China;
2. State Grid Xuchang Power Supply Company, Xuchang 461000, China) |
| Abstract: |
| To address the issues of inadequate sharing accuracy, irrational current distribution, unbounded droop coefficient values, and slow state of charge (SOC) balancing in traditional droop control, this paper proposes a novel SOC balancing droop control method based on an improved droop coefficient. First, the shortcomings of traditional power index form droop control are analyzed, and a new droop coefficient form embedding a nested arctangent function into the power index is proposed to limit the droop coefficient values, thereby enhancing system stability and reliability. Subsequently, to tackle the problem of slow SOC balancing speed, an acceleration factor Q is introduced into the droop coefficient to improve the balancing speed, and the impact of different Q values on the droop curve is analyzed. Finally, a simulation model is constructed to validate the proposed method through comparative analysis. Simulation results demonstrate that the improved method significantly accelerates SOC balancing when the SOC difference is small. During the balancing process, the droop coefficient varies more smoothly, and the bus voltage does not exhibit significant oscillations even when the SOC difference is large. |
| Key words: droop control droop coefficient SOC balancing state of charge |
