基于孤島型直流微電網(wǎng)的自適應下垂控制研究
趙鵬，袁川來，夏俊濤，黃豐源
(湖南工業(yè)大學 電氣與信息工程學院，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荷消耗功率的波動性，提出一種自適應下垂控制策略，通過構建下垂系數(shù)與鋰電池 SOC 的函數(shù)關系對下垂系數(shù)動態(tài)調節(jié)進而實現(xiàn)鋰電池 SOC 的均衡。再以直流母線電壓和鋰電池 SOC 為基礎，將系統(tǒng)劃分為五種工作模式，進而減少直流微電網(wǎng)因直流母線電壓波動導致的協(xié)調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控制策略能有效維持微電網(wǎng)內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。
關鍵詞： 直流微電網(wǎng)；自適應下垂控制；混合儲能；直流母線電壓
中圖分類號：TM615 ；TM727 文獻標識碼：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
參考文獻
[1] 張嘉祺，王琛，梁發(fā)云.“雙碳”背景下我國海上風電與海洋牧場協(xié)同開發(fā)初探[J] . 能源環(huán)境保護，2022，36(5) ：18-26.
[2] LI J, CHEN S, WU Y, et al.How to make better use of intermittent and variable energy a review of wind and photovoltaic power consumption in China[J].Renewable and Sustainable Energy Reviews，2021，137 ：110626.
[3] 李芳盛，齊云國，韓文婧. 基于多層次模型對美國新能源應用情況的分析研究[J] . 能源環(huán)境保護，2019，33(5)：6-11.
[4] GHANBARI N, BHATTACHARYA S.Adaptive droop control method for suppressing circulating currents in dc microgrids[J].IEEE Open Access Journal of Power and Energy，2020，7 ：100-110.
[5] BEVRANI H, FRANCOIS B, ISE T.Microgrid dynamics and control[M].Hoboken ：John Wiley & Sons，2017.
[6] WU W, CHEN Y, LUO A, et al.A virtual inertia control strategy for DC microgrids analogized with virtual synchronous machines[J].IEEE Transactions on Industrial Electronics，2016，64(7)：6005-6016.
[7] IRMAK E, GüLER N, KABALCI E, et al.A modified droop control method for PV systems in island mode DC microgrid[C]//2019 8th International Conference on Renewable Energy Research and Applications(ICRERA)，2019 ：1008-1013.
[8] WANG S, LU L, HAN X, et al.Virtual-battery based droop control and energy storage system size optimization of a DC microgrid for electric vehicle fast charging station[J].Applied Energy，2020，259 ：114146.
[9] 張超，馬幼捷，何曉宇，等. 獨立型光儲直流微電網(wǎng)協(xié)調控制策略[J]. 電工電氣，2022(11) ：11-16.
[10] 舒愷，劉峰，郭高鵬，等. 并網(wǎng)型直流微電網(wǎng)協(xié)調控制策略[J]. 電網(wǎng)與清潔能源，2020，36(11) ：58-67.
[11] 尹聰聰，楊旭紅. 孤島直流微電網(wǎng)的光儲協(xié)調控制策略[J]. 上海電機學院學報，2020，23(4) ：194-199.
