Co-Control Method for Direct Current Microgrids with Electro-Hydrogen Coupled Energy Storage Systems

doi:10.16183/j.cnki.jsjtu.2024.293

Abstract

Abstract:

Hydrogen production from photovoltaic (PV) power generation is an important approach to improving the consumption of renewable energy and reducing the impact on the power grid. To suppress power fluctuation from PV generation and loads in an electro-hydrogen system and reduce variations in the hydrogen storage state charge, and avoid frequent start-stop operations of hydrogen storage equipment caused by state-of-hydrogen limit violations, an electro-hydrogen coupled direct current (DC) microgrid cooperative control strategy is proposed. First, a fuzzy control algorithm is used to optimize and regulate the power allocation between hydrogen storage systems and lithium battery storage. Then, the DC microgrid operating conditions are divided into normal and extreme conditions according to the hydrogen storage state, and the hydrogen storage state of the hydrogen storage tank is dynamically adjusted by the proposed hydrogen storage variable-parameter sag control strategy to inhibit the speed of state of hydrogen of the hydrogen storage moving towards the overcharge and overdischarge intervals by different control strategies, and to improve the regulation capability of the DC microgrid. Finally, simulation analysis by MATLAB/Simulink verifies that the proposed control strategy can enhance the ability of the electro-hydrogen coupled DC microgrid to suppress source load fluctuations, maintain the stability of the DC bus voltage, and alleviate overcharge and overdischarge in the hydrogen storage energy systems, thus extending the service life of the equipment.

Key words: electro-hydrogen coupling, direct current (DC) microgrid, fuzzy control, power coordination, sag control

CLC Number:

TM614

LI Jianlin, SHI Zelin, LIANG Zhonghao, LIANG Ce. Co-Control Method for Direct Current Microgrids with Electro-Hydrogen Coupled Energy Storage Systems[J]. Journal of Shanghai Jiao Tong University, 2026, 60(6): 943-954.

Figures/Tables 17

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SoC	SoH
SoC	NB	NS	M	PS	PB
NB	M	M	PS	PB	PB
NS	M	M	PS	PS	PB
M	NB	NS	M	PS	PB
PS	NB	NS	NS	M	M
PB	NB	NB	NS	M	M

SoC	SoH
SoC	NB	NS	M	PS	PB
NB	M	M	NS	NB	NB
NS	M	M	NS	NS	NB
M	PB	PS	M	NS	NB
PS	PB	PS	PS	M	M
PB	PB	PB	PS	M	M

运行工况	工况编号	SoH范围	控制策略
运行工况	工况编号	SoH范围	电解槽	燃料电池
正常工况	1	S_SoHH<S_SoH<S_SoH,max	下垂	下垂
	2	S_SoHL<S_SoH<S_SoHH	恒功率	下垂
	3	S_SoH,min<S_SoH<S_SoHL	下垂	下垂
极端工况	4	S_SoH≥S_SoH,max	停机	恒功率
极端工况	5	S_SoH≤S_SoH,min	恒功率	停机

参数	取值
U_dc/V	480
C/μF	4000
开关频率,f_s/kHz	10
光伏滤波电感,L/mH	2.2
光伏滤波电容,C_PV/μF	0.16
锂电池额定容量,Q_BAT/(A·h)	30
U_BAT/V	48
电解槽额定功率,P_EL0/kW	10
燃料电池额定功率,P_FC0/kW	10

时间/s	光照强度/ (W·m^-2)	直流负载/ kW	需求功率/ kW
[0, 2]	1000	5	10
(2, 4]	1000	20	-5
(4, 5]	650	20	-10
(5, 7]	650	5	5
(7, 9]	1000	5	10
(9, 10]	1300	25	-5