Optimal capacity configuration of off-grid wind-solar hybrid hydrogen production and green ammonia synthesis system

doi:10.3969/j.issn.2097-0706.2024.11.009

Abstract

Abstract:

To address the significant fluctuations and storage and transportation challenges associated with renewable energy， an off-grid wind-solar hybrid hydrogen production and green ammonia synthesis system was proposed. The levelized cost of ammonia（LCOA） between the wind-solar hybrid system and standalone wind and solar energy systems was compared， and sensitivity analysis on the green ammonia cost of the system was performed. Based on actual wind-solar output data， the system tightly coupled capacity design with operation scheduling. Hourly scheduling optimization was performed under constraints of equipment operation status and capacity configuration， aiming to maximize the system's economic returns through a mixed-integer linear programming （MILP） algorithm. The hybrid strategy effectively reduced renewable energy volatility. Energy storage devices smoothed out hydrogen and electricity fluctuations， ensuring continuity and stability of energy supply. The research results provide a feasible basis for implementing wind-solar hydrogen-ammonia integrated projects in remote and weak-grid areas or regions where grid connection is challenging， and serve as a reference for the construction of future demonstration projects.

Key words: wind power generation, photovoltaic power generation, hydrogen energy, off-grid operation, capacity optimization, green ammonia

CLC Number:

TQ113：TM732：TM73

WANG Haiming, ZHANG Runzhi, ZHOU Jiahui, XU Gang, GENG Jiaxi. Optimal capacity configuration of off-grid wind-solar hybrid hydrogen production and green ammonia synthesis system[J]. Integrated Intelligent Energy, 2024, 46(11): 73-82.

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设备	投资成本	年均运维成本比例/%
光伏发电机组	3 800 元/kW	1
风力发电机组	4 600 元/kW	2
绿氨合成设备	4 680 元/t	2
电解槽	2 000 元/kW	2
储氢罐	1 750 元/kg	1
蓄电池容量价格	1 200 元/(kW·h)	2
蓄电池功率价格	800 元/kW	2

设备	参数	数值
氨合成	绿氨转化效率/%	98
	单位产量电耗/(kW·h·kg^-1)	0.95
	功率范围/%	30~110
电解槽	单位产量电耗/(kW·h·kg^-1)	56
电解槽	功率范围/%	5~110
储氢罐	有效储量调节范围/%	5~95
储氢罐	充放效率/%	98
蓄电池	有效储量调节范围/%	10~90
	充放效率/%	95
	自损率/%	0.01
	储能时间/h	4

项目	风光互补	单独光伏	单独风电
光伏/MW	125	490	0
风电/MW	215	0	330
氨/(万t·a^-1)	7.32	6.83	7.96
电解槽/MW	156.94	265.64	192.14
储能容量/（MW·h）	62.05	184.15	91.14
储氢罐/t	22.84	122.79	84.8
氨平准化价格/(元·t^-1)	3 857.63	6 290.44	4 346.84

投资项目	投资成本
风力发电机组	8 256
光伏发电机组	3 800
绿氨合成设备	4 274
电解槽	4 394
储氢罐	689
蓄电池	1 501
运行维护	4 966