| 引用本文: | 户艳琴,周仁友,黄天翔,等.基于改进下垂控制的并网级联型储能系统SOC均衡策略[J].电力系统保护与控制,2021,49(22):120-129.[点击复制] |
| HU Yanqin,ZHOU Renyou,HUANG Tianxiang,et al.SOC balancing strategy of a grid-connected cascaded-type energy storage system based on advanced droop control[J].Power System Protection and Control,2021,49(22):120-129[点击复制] |
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| 摘要: |
| 并网级联型储能系统；P下垂控制；电网同步；有功功率平衡；SOC均衡 |
| 关键词: 并网级联型储能系统 P下垂控制 电网同步 有功功率平衡 SOC均衡 |
| DOI：DOI: 10.19783/j.cnki.pspc.210164 |
| 投稿时间：2021-02-10修订日期：2021-03-20 |
| 基金项目:湖南省自然科学基金项目资助(2017JJ2348)；国网江西省电力有限公司科技项目“开展台区综合能效管理和提升的应用技术研究”(521855190001) |
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| SOC balancing strategy of a grid-connected cascaded-type energy storage system based on advanced droop control |
| HU Yanqin,ZHOU Renyou,HUANG Tianxiang,ZHANG Yan,NING Tao,YU Jingrong |
| (1. State Grid Jiangxi Integrated Energy Service Co., Ltd., Nanchang 330096, China;
2. College of Automation, Central South University, Changsha 410083, China) |
| Abstract: |
| There are imbalance problems in the State of Charge (SOC) of batteries in grid-connected cascaded-type battery energy storage systems. Thus an improved droop control considering SOC balancing strategy is proposed. Based on traditional droop control, this method introduces a distribution correction term by considering SOC real-time estimation information of each battery pack. Then the reference active power and reference voltage amplitude can be reasonably distributed according to the SOC information, and the SOC balancing of each module is achieved without affecting the normal power output as well as keeping synchronization with the grid. In this way, the SOC balancing speed can be adjusted by changing the correction coefficient. In addition, stability analysis of the system based on singular perturbation theory is carried out, and the design basis for control parameters is given. The simulation results under different conditions verify the correctness and validity of the proposed control strategy and the theoretical analysis.
This work is supported by the Natural Science Foundation of Hunan Province (No. 2017JJ2348). |
| Key words: grid-connected cascaded-type battery energy storage system P droop control grid synchronization active power balancing SOC balancing |
