基于孤岛型直流微电网的自适应下垂控制研究
赵鹏，袁川来，夏俊涛，黄丰源
(湖南工业大学 电气与信息工程学院，湖南 株洲 412007)
摘 要：在孤岛型直流微电网中，采用下垂控制可以无需电源间的通信实现并联电源间按比例分配功率波动，但传统的下垂控制并不能实现锂电池荷电状态(SOC)的均衡。针对孤岛型直流微电网中光伏阵列输出功率以及负荷消耗功率的波动性，提出一种自适应下垂控制策略，通过构建下垂系数与锂电池 SOC 的函数关系对下垂系数动态调节进而实现锂电池 SOC 的均衡。再以直流母线电压和锂电池 SOC 为基础，将系统划分为五种工作模式，进而减少直流微电网因直流母线电压波动导致的协调控制模式的频繁切换。在 MATLAB/Simulink 中搭建了孤岛型直流微电网模型，通过仿真分析验证了改进控制策略能有效维持微电网内功率平衡和直流母线电压稳定并实现锂电池 SOC 的均衡。
关键词： 直流微电网；自适应下垂控制；混合储能；直流母线电压
中图分类号：TM615 ；TM727 文献标识码：A 文章编号：1007-3175(2024)09-0001-05
Research on Adaptive Droop Control Based on Islanded DC Microgrid
ZHAO Peng, YUAN Chuan-lai, XIA Jun-tao, HUANG Feng-yuan
（College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China）
Abstract: In islanded island DC microgrid, the power fluctuation between parallel power sources can be distributed proportionally by using droop control without communication between power sources. However, the traditional droop control can not achieve the balance of lithium battery SOC . Aiming at the fluctuation of photovoltaic array output power and load consumption power in islanded DC microgrid, an adaptive droop control strategy is proposed in this paper. The droop coefficient is dynamically adjusted by constructing a functional relationship between the droop coefficient and lithium battery SOC , so as to achieve the balance of lithium battery SOC . Based on DC bus voltage and lithium battery SOC , the system is divided into 5 operating modes to reduce the frequent switching of coordinated control modes caused by DC bus voltage fluctuations in DC microgrid.The islanded DC microgrid model is built in MATLAB/Simulink, and the simulation analysis verifies that the improved control strategy can effectively maintain the power balance in the microgrid and the DC bus voltage stability,and realize the SOC balance of the lithium battery.
Key words: DC microgrid; adaptive droop control; hybrid energy storage; DC bus voltage
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