| 引用本文: | 方 炜,周 密,史庆平,等.基于线路阻抗逐次补偿的直流微电网分布式储能单元自适应均衡控制策略[J].电力系统保护与控制,2025,53(22):32-42.[点击复制] |
| FANG Wei,ZHOU Mi,SHI Qingping,et al.Adaptive balancing control strategy for distributed energy storage units in DC microgrids based on successive line impedance compensation[J].Power System Protection and Control,2025,53(22):32-42[点击复制] |
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| 摘要: |
| 针对直流微电网储能单元间线路阻抗不匹配导致荷电状态(state-of-charge, SoC)不平衡，进而引起储能单元过充或过放的问题，提出了一种基于线路阻抗逐次补偿的自适应下垂控制策略。首先，在线路阻抗补偿控制中，将过程分为三个阶段：第一阶段通过对输出电流积分更新下垂系数；第二阶段将积分中间时刻输出电流作为参考电流恢复母线电压；第三阶段对均流误差进行估计，更新迭代信号。此外，设置切换信号，对控制阶段进行切换，采用一致性算法对迭代信号进行计算以更新切换信号。其次，在SoC均衡控制中，将补偿后的线路阻抗与关联SoC信息的单调函数加入到自适应下垂控制中，实现储能单元的SoC均衡控制和均流。最后，通过多个储能单元组成的硬件实验平台验证了所提控制策略的正确性和可行性。 |
| 关键词: 直流微电网 下垂控制 分布式储能单元 虚拟阻抗 SoC均衡 |
| DOI：10.19783/j.cnki.pspc.241508 |
| 投稿时间：2024-11-11修订日期：2025-01-19 |
| 基金项目:国家自然科学基金项目资助(52277169) |
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| Adaptive balancing control strategy for distributed energy storage units in DC microgrids based on successive line impedance compensation |
| FANG Wei,ZHOU Mi,SHI Qingping,WANG Leiyu,TONG Wei,LIU Xiaodong,ZHANG Qianjin |
| (Key Lab of Power Electronics and Motion Control, Anhui University of Technology, Maanshan 243002, China) |
| Abstract: |
| Aiming at the problem of state-of-charge (SoC) imbalance among energy storage units in DC microgrids caused by line impedance mismatch, which can lead to overcharging or over-discharging of individual units, an adaptive droop control strategy based on successive compensation of line impedance is proposed. First, in the line impedance compensation control, the process is divided into three stages. In the first stage, the droop coefficient is updated by integrating the output current. In the second stage, the output current at the intermediate integration moment is used as the reference current to restore the bus voltage. In the third stage, the current sharing error is estimated to update the iterative signal. In addition, a switching signal is introduced to control the transitions between stages, and a consistency algorithm is used to calculate the iterative signal for updating the switching signal. Next, in the SoC balancing control, the compensated line impedance and a monotonic function associated with the SoC information are incorporated into the adaptive droop control to achieve SoC balancing and current sharing among the energy storage unit. Finally, an experimental prototype with multiple energy storage units is built to verify the feasibility and effectiveness of the proposed strategy. |
| Key words: DC microgrid droop control distributed energy storage unit virtual impedance state-of-charge balancing |
