Optimal Dispatching Method of Wind-Hydrogen Hybrid System Considering Heat Balance of Hydrogen Energy Storage

doi:10.16628/j.cnki.2095-8188.2021.11.003

Abstract

Abstract:

When wind-hydrogen hybrid system (W-HHS) participates in grid,the heat demand characteristics of hydrogen energy storage system (HESS) working intermittently become the key factor affecting system dispatching.A HESS model with waste heat utilization system is established.Under the heat balance constraints composed of heat power balance and thermal energy balance of HESS,an optimal dispatching method of W-HHS is proposed to improve the profit and meet the constraints of tracking grid dispatching curve.Finally,the proposed model and method are verified and analyzed through an example of Qinghai wind plant data.The results show that the heat balance constraints of the HESS have an important impact on the operation and dispatching of the W-HHS.The proposed dispatching method improves the operation reliability of the W-HHS on the premise of ensuring the heat power balance and thermal energy balance of the HESS.Parameter analysis shows that reducing the heat dissipation coefficient can decrease the impact of heat balance constraints on the dispatching strategy of W-HHS and improve the grid connected power of wind plant.

Key words: hydrogen energy storage, hybrid system, optimal dispatching, distributionally robust, heat balance

CLC Number:

TM734

SI Yang, CHEN Laijun, MA Linrui, GAO Mengyu, CHEN Xiaotao, MEI Shengwei. Optimal Dispatching Method of Wind-Hydrogen Hybrid System Considering Heat Balance of Hydrogen Energy Storage[J]. LOW VOLTAGE APPARATUS, 2021, 0(11): 15-21.

Figures/Tables 7

References 20

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参数	数值	参数	数值
风电装机容量/MW	90	换热器效率/%	80
燃料电池装机容量/MW	9	环境温度/℃	20
电解槽装机容量/MW	9	氢气高热值/ (kJ·mol^-1)	282
储氢罐容量/kg	50	燃料电池单位容量散热系数/℃	1/600
燃料电池效率/%	60	电解槽单位容量散热系数/℃	1/600
电解槽效率/%	60	水比热容/ [kJ·(kg·℃)^-1]	4.2
燃料电池工作温度/℃	80	可用系数	0.8~1.2
电解槽工作温度/℃	80	置信度	0.05

场景	混合系统收益/万元	储热罐余热/MWh	储氢罐余氢/kg	可用系数
不考虑热平衡	46.7	-12.63	5.85	0.982 1
考虑热平衡	45.3	0	14.98	0.949 9

散热系数	可用系数	储氢罐余氢/kg	储热罐余热/MWh
1/500	0.944 1	16.64	0
1/600	0.949 9	14.98	0
1/700	0.964 6	11.08	0
1/800	0.975 6	5.72	0.219
1/900	0.982 1	5.72	0.677
1/1 000	0.982 1	5.92	1.873
1/1 100	0.982 1	5.85	30.470