基于孤島型直流微電網(wǎng)的自適應(yīng)下垂控制研究
趙鵬，袁川來，夏俊濤，黃豐源
(湖南工業(yè)大學(xué) 電氣與信息工程學(xué)院，湖南 株洲 412007)
摘 要：在孤島型直流微電網(wǎng)中，采用下垂控制可以無需電源間的通信實現(xiàn)并聯(lián)電源間按比例分配功率波動，但傳統(tǒng)的下垂控制并不能實現(xiàn)鋰電池荷電狀態(tài)(SOC)的均衡。針對孤島型直流微電網(wǎng)中光伏陣列輸出功率以及負(fù)荷消耗功率的波動性，提出一種自適應(yīng)下垂控制策略，通過構(gòu)建下垂系數(shù)與鋰電池 SOC 的函數(shù)關(guān)系對下垂系數(shù)動態(tài)調(diào)節(jié)進(jìn)而實現(xiàn)鋰電池 SOC 的均衡。再以直流母線電壓和鋰電池 SOC 為基礎(chǔ)，將系統(tǒng)劃分為五種工作模式，進(jìn)而減少直流微電網(wǎng)因直流母線電壓波動導(dǎo)致的協(xié)調(diào)控制模式的頻繁切換。在 MATLAB/Simulink 中搭建了孤島型直流微電網(wǎng)模型，通過仿真分析驗證了改進(jìn)控制策略能有效維持微電網(wǎng)內(nèi)功率平衡和直流母線電壓穩(wěn)定并實現(xiàn)鋰電池 SOC 的均衡。
關(guān)鍵詞： 直流微電網(wǎng)；自適應(yīng)下垂控制；混合儲能；直流母線電壓
中圖分類號：TM615 ；TM727 文獻(xiàn)標(biāo)識碼：A 文章編號：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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