Operation optimization of offshore wind-multi-stack hydrogen system considering efficiency and lifetime

doi:10.3969/j.issn.2097-0706.2022.05.008

Abstract

Abstract:

An offshore wind-hydrogen system is constituted by an offshore wind farm, a hydrogen energy system and transmission system. It facilitates the realization of the whole-process offshore power clean supply and carbon neutrality by providing electric power and hydrogen to onshore and offshore users. Electrolyzers and fuel cells are the key components of the offshore wind-hydrogen system, and their efficiency and lifetime are closely related to their own working conditions. Therefore, it is necessary to finely simulate them for system operation optimization. Based on the modelling of electrolyzers and fuel cells, an offshore wind-multi-stack hydrogen system operation optimization strategy considering efficiency and service life is proposed. The simulation results show that the proposed method can effectively improve the system operation benefits, shorten the life attenuation of the electrolyzer and fuel cell and smooth the attenuation the stacks.

Key words: integrated energy system, offshore wind-multi-stack hydrogen system, carbon neutrality, electrolyzer, fuel cell, efficiency, life attenuation, balance

CLC Number:

TK89：TK91

Ziqiu LI, Ying QIAO, Zongxiang LU. Operation optimization of offshore wind-multi-stack hydrogen system considering efficiency and lifetime[J]. Integrated Intelligent Energy, 2022, 44(5): 69-77.

Figures/Tables 11

Fig.1

Fig.2

Table 1

Table 2

Parameters of the gas turbine

燃气轮机	$P g t, m i n, j$ /MW	$P g t, m a x, j$ /MW	$b j$ /[m³·(MW·h)^-1]	$c j$ /(m³·h^-1)
^#1,^#2	3	15	172.5	729.2
^#3,^#4	1	5	172.5	729.2

Table 2

Table 3

Fig.3

Fig.4

Table 4

Optimization results of different schemes

项目	方案1	方案2	方案3	方案4
计划运行收益/万元	71.793	74.589	72.445	75.215
实际运行收益/万元	73.014	74.589	73.016	75.215
EL寿命平均衰减( $× 10 - 4$ )/V	1.504 8	1.394 7	1.414 6	1.289 2
EL寿命衰减偏移( $× 10 - 6$ )/V			18.162 0	0.802 8
EL平均效率/%	71.37	72.74	70.84	72.63
FC寿命平均衰减( $× 10 - 4$ )/V	1.228 6	1.236 5	0.603 9	1.213 3
FC寿命衰减偏移( $× 10 - 6$ )/V			10.250 1	5.827 5
FC平均效率/%	41.20	41.87	39.99	41.80

Table 4

Fig.5

Fig.6

Fig.7

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项目	时段	电价
峰时	08:00—12:00,15:00—22:00	0.891
平时	06:00—08:00,12:00—15:00,22:00—23:00	0.510
谷时	23:00—24:00,00:00—06:00	0.235

参数		设定值
EL	N_el	8
	k_e1	2.50×10⁴
	k_e2	0.96
	K_el,1/（μV·h^-1)	2.6×10^-6
	K_el,2/（μV·h^-1)	2.6×10^-6
	K_el,3/（μV·次^-1)	1.67×10^-4
	K_el,4/（μV·次^-1)	3.52×10^-5
	A/cm²	160
FC	N_fc	4
	K_fc,1/（μV·h^-1)	8.66×10^-6
	K_fc,2/（μV·h^-1)	1.00×10^-5
	K_fc,3/（μV·次^-1)	13.790 0×10^-6
	K_fc,4/（μV·次^-1)	0.418 5×10^-6
规划模型	P_el,max/MW	100
	P_fc,max/MW	16
	P_trans/MW	160
	V_max/m³	5.618×10⁵
	p_h/(元·m^-3)	4.00
	p_c/(元·m^-3)	1.85
	p_e2/[元·(kW·h)^-1]	0.453 2
	μ_loss	0.025