Research on Energy Coordination Control Strategy in DC Microgrid

doi:10.16182/j.issn1004731x.joss.22-0160

Abstract

Abstract:

Aiming of the bus voltage stability and energy flow balance in DC microgrids, a switching control strategy based on the energy balance relationship of DC microgrid is proposed. The bus voltage balance of DC microgrid is transformed into energy balance, and DC microgrid is modeled as a linear switching system with five modes. A controller is designed for each mode to stabilize the bus voltage. To achieve the seamless and smooth switching between modes, on the basis of maintaining the stability of any switching, the corresponding mode switching rules are given based on the energy flow characteristics of microgrid. Theoretical analysis shows that the switching control strategy can effectively achieve bus voltage stability and energy balance. The results of simulation on both individual modes and mode switching show that the control strategy can control bus voltage fluctuations within $± 5 %$ of the rated voltage and quickly return to the desired voltage in the case of power imbalance.

Key words: DC microgrid, mode switching strategy, bus voltage balance, energy balance, linear switching system

CLC Number:

TP391.9

Zibao Lu, Hao Ding, Fangyun Sun, Ziqiong Ding, Li Gong, Rui Zheng. Research on Energy Coordination Control Strategy in DC Microgrid[J]. Journal of System Simulation, 2023, 35(6): 1215-1225.

Figures/Tables 10

Fig. 1

Fig. 2

Fig. 3

Table 1

Summary of modes and switching conditions

模式	工作条件	母线调节单元
1	$P D G - P L o a d - P E S S - c h > P g a$	可再生能源
2	$0 < P D G - P L o a d - P E S S - c h < P g a$	大电网
3	$0 < P D G - P L o a d < P E S S - c h$	储能单元
4	$0 < P D G + P E S S - d c h - P L o a d < P E S S - d c h$	储能单元
5	$P D G + P E S S - c h - P L o a d < 0$	大电网

Table 1

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

References 16

1	Seyedi Y, Karimi H, Malandra F, et al. Coordinated Control of Distributed Energy Resources Using Features of Voltage Disturbances[J]. IEEE Transactions on Industrial Informatics, 2019, 16(6): 3895-3904.
2	马艺玮, 杨苹, 吴捷. 含多分布式电源独立微电网的混合控制策略[J]. 电力系统自动化, 2015, 39(11): 103-109.
	Ma Yiwei, Yang Ping, Wu Jie. Hybrid Control Strategy of Islanded Microgrid with Numerous Distributed Generators[J]. Automaton of Electric Power System, 2015, 39(11): 103-109.
3	林永君, 陈鑫, 杨凯, 等. 含多微网的主动配电网双层分布式优化调度[J]. 系统仿真学报, 2022, 34(11): 2323-2336.
	Lin Yongjun, Chen Xin, Yang Kai, et al. Bilevel Distributed Optimal Dispatch of Active Distribution Network with Multi-microgrids[J]. Journal of System Simulation, 2022, 34(11): 2323-2336.
4	张坤平, 郝琳. 基于模型预测的微电网频率协调控制策略[J]. 系统仿真学报, 2021, 33(3): 581-590.
	Zhang Kunping, Hao Lin. Frequency Coordinated Control Strategy of Microgrid Based on Fuzzy Prediction[J]. Journal of System Simulation, 2021, 33(3): 581-590.
5	孙伟卿, 刘通, 刘波, 等. 微电网中光-储系统不同组网方式经济性分析[J]. 系统仿真学报, 2018, 30(5): 1812-1817, 1825.
	Sun Weiqing, Liu Tong, Liu Bo, et al. Network Mode and Economy Analysis of Photovoltaic-battery System in Microgrid[J]. Journal of System Simulation, 2018, 30(5): 1812-1817, 1825.
6	刘彦呈, 庄绪州, 张勤进, 等. 基于虚拟频率的直流微电网下垂控制策略[J]. 电工技术学报, 2021, 36(8): 1693-1702.
	Liu Yancheng, Zhuang Xuzhou, Zhang Qinjin, et al. A Virtual Current-frequency Droop Control in DC Microgrid[J]. Transactions of China E1ectrotechnica1 society, 2021, 36(8): 1693-1702.
7	郑凯元, 杜文娟, 王海风. 动态单元间交互作用对直流微电网稳定性影响的分析[J]. 中国电机工程学报, 2021, 41(23): 7963-7980.
	Zheng Kaiyuan, Du Wenjuan, Wang Haifeng. Analysis on the Stability of DC Microgrid Affected by Interactions Among Dynamic Components[J]. Proceeding of the Chinese Society of Electrical, 2021, 41(23): 7963-7980.
8	Wang Y, Tan K T, Peng X Y, et al. Coordinated Control of Distributed Energy Storage Systems for Voltage Regulation in Distribution Networks[J]. IEEE Transactions on Power Delivery, 2016, 31(3): 1132-1141.
9	谢文强, 韩民晓, 王皓界, 等. 基于虚拟电压的直流微电网多源协调控制策略[J]. 中国电机工程学报, 2018, 38(5): 1408-1418.
	Xie Wenqiang, Han Minxiao, Wang Haojie, et al. Multi-source Coordinated Control Strategy of DC Microgrid Based on Virtual Voltage[J]. Proceeding of the Chinese Society of Electrical, 2018, 38(5): 1408-1418.
10	Kai S, Li Z, Xing Y, et al. A Distributed Control Strategy Based on DC Bus Signaling for Modular Photovoltaic Generation Systems with Battery Energy Storage[J]. IEEE Transactions on Power Electronics, 2011, 26(10): 3032-3045.
11	Gu Y, Xiang X, Li W, et al. Mode-Adaptive Decentralized Control for Renewable DC Microgrid with Enhanced Reliability and Flexibility[J]. IEEE Transactions on Power Electronics, 2014, 29(9): 5072-5080.
12	Wu Dan, Tang Fen, Tomislav Dragicevic, et al. Coordinated Control Based on Bus-signaling and Virtual Inertia for Islanded DC Microgrids[J]. IEEE Transactions on Smart Grid, 2015, 6(6): 2627-2638.
13	Kumar M, Srivastava S C, Singh S N. Control Strategies of a DC Microgrid for Grid Connected and Islanded Operations[J]. IEEE Transactions on Smart Grid, 2017, 6(4): 1588-1601.
14	Neto P, Barros T, Silveira J, et al. Power Management Strategy Based on Virtual Inertia for DC Microgrids[J]. IEEE Transactions on Power Electronics, 2020, 35(11): 12472-12485.
15	Mojica-Nava E, Rey J M, Torres-Martinez J, et al. Decentralized Switched Current Control for DC Micro- grids[J]. IEEE Transactions on Industrial Electronics, 2019, 66(2): 1182-1191.
16	Karabacak Z, Kivilcim A, Wisniewski Wisniewski R.. Almost Global Stability of Nonlinear Switched Systems with Time-Dependent Switching[J]. IEEE Transactions on Automatic Control, 2020, 65(7): 2969-2978.

[1]	Li Gang, Zhang Caixia, Hu Shaolin, Wang Xiangdong, Guo Jing. WSN Clustering Routing Protocol for Bridge Structure Health Monitoring [J]. Journal of System Simulation, 2022, 34(1): 62-69.
[2]	Gao Mei, Wang Bingyuan, Zhang Dandan, Sun Zhaorong. Study on Balanced Energy-consumption Routing Protocol of Airfield Single-lamp Monitoring System [J]. Journal of System Simulation, 2017, 29(8): 1772-1779.