High Quality Cooperative Control of DC Microgrids Using Dynamic Consensus Algorithm

doi:10.11985/2022.01.003

Abstract

Abstract:

Aiming at islanded DC microgrids, a cooperative control strategy based on consensus algorithm is proposed. In this strategy, the controllers for each distributed generation can achieve precise voltage control and power sharing, which only requires communication with neighboring units. However, the classic cooperative control schemes simultaneously require the knowledge of voltage and current information of their neighboring units, hence still have high communication burden. A unified distributed control strategy is proposed. This strategy integrates the voltage control and power sharing processes into one step, and eliminates the current information from neighboring units, greatly reducing the need of communication bandwidth. Finally, the effectiveness of the proposed method is verified by simulation.

Key words: Distributed cooperative control, DC microgrid, dynamic consensus algorithm

CLC Number:

TM72

ZHANG Hao, LI Yu, YIN Yafei, LI Zhen, ZHANG Zhenbin. High Quality Cooperative Control of DC Microgrids Using Dynamic Consensus Algorithm[J]. Journal of Electrical Engineering, 2022, 17(1): 15-21.

Figures/Tables 12

References 10

[1]	朱珊珊, 汪飞, 郭慧, 等. 直流微电网下垂控制技术研究综述[J]. 中国电机工程学报, 2018, 38(1):72-84,344.
	ZHU Shanshan, WANG Fei, GUO Hui, et al. Overview of droop control in DC microgrid[J]. Proceedings of the CSEE, 2018, 38(1):72-84,344.
[2]	李霞林, 郭力, 王成山, 等. 直流微电网关键技术研究综述[J]. 中国电机工程学报, 2016, 36(1):2-17.
	LI Xialin, GUO Li, WANG Chengshan, et al. Key technologies of DC microgrids:An overview[J]. Proceedings of the CSEE, 2016, 36(1):2-17.
[3]	XIA Y, WEI W, YU M, et al. Power management for a hybrid ac/dc microgrid with multiple subgrids[J]. IEEE Trans. Power Electron., 2018, 33(4):3520-3533. doi: 10.1109/TPEL.2017.2705133
[4]	OLIVARES E D, MEHRIZI-SANI A, ETEMADI H A, et al. Trends in microgrid control[J]. IEEE Transactions on Smart Grid, 2014, 5(4):1905-1919. doi: 10.1109/TSG.2013.2295514
[5]	LU X, GUERRERO J M, SUN K, et al. An improved droop control method for dc microgrids based on low bandwidth communication with DC bus voltage restoration and enhanced current sharing accuracy[J]. IEEE Trans. Power Electron., 2014, 29(4):1800-1812. doi: 10.1109/TPEL.2013.2266419
[6]	NASIRIAN V, MOAYEDI S, DAVOUDI A, et al. Distributed cooperative control of dc microgrids[J]. IEEE Trans. Power Electron., 2015, 30(4):2288-2303. doi: 10.1109/TPEL.2014.2324579
[7]	高扬, 艾芊, 王靖. 多智能体系统的交直流混合微网群一致性协同控制[J]. 高电压技术, 2018, 44(7):2372-2377.
	GAO Yang, AI Qian, WANG Jing. Consensus cooperative control of AC/DC hybrid microgrids based on multi-agent system[J]. High Voltage Engineering, 2018, 44(7):2372-2377.
[8]	黄桂根. 直流微网自适应下垂均流技术研究[D]. 杭州: 浙江大学, 2016.
	HUANG Guigen. Research on adaptive droop current-sharing technique for DC micro-grid[D]. Hangzhou: Zhejiang University, 2016.
[9]	周建宇, 闫林芳, 刘巨, 等. 基于一致性理论的直流微电网混合储能协同控制策略[J]. 中国电机工程学报, 2018, 38(23):6837-6846,7118.
	ZHOU Jianyu, YAN Linfang, LIU Ju, et al. A cooperative control strategy for DC microgrid based on consensus algorithm[J]. Proceedings of the CSEE, 2018, 38(23):6837-6846,7118.
[10]	KIA S S, SCOY B V, CORTES J, et al. Tutorial on dynamic average consensus:The problem,its applications,and the algorithms[J]. IEEE Control Systems Magazine, 2019, 39(3):40-72.

参数	数值
直流母线电压参考值$V_{dc}^{*}$/V	88
本地负载1${{R}_{load-1}}$/Ω	20
本地负载2${{R}_{load-2}}$/Ω	25
本地负载3${{R}_{load-3}}$/Ω	30
本地负载4${{R}_{load-4}}$/Ω	40
线路阻抗1$\begin{align} & {{R}_{L1}}\text{/}\Omega \text{ } \\ & {{L}_{L1}}\text{/}mH \\ \end{align}$	0.1
	100
线路阻抗2$\begin{align} & {{R}_{L2}}\text{/}\Omega \text{ } \\ & {{L}_{L2}}\text{/}mH \\ \end{align}$	0.8
	200
线路阻抗3$\begin{align} & {{R}_{L3}}\text{/}\Omega \text{ } \\ & {{L}_{L3}}\text{/}mH \\ \end{align}$	0.25
	150
线路阻抗4$\begin{align} & {{R}_{L4}}\text{/}\Omega \text{ } \\ & {{L}_{L4}}\text{/}mH \\ \end{align}$	0.5
	80
初始公共负载${{R}_{1}}$/Ω	20
比例环节${{K}_{V}}$	200
虚拟阻抗${{R}_{i}}$/Ω	10
式(12)中的权重因子a₁₂a₂₃a₃₄a₄₁	0.4 0.2 0.4 0.4