Configuration Optimization of Off-Grid Energy System Based on HT-PEMFC and VRFB

doi:10.12096/j.2096-4528.pgt.21057

Abstract

Abstract:

In this paper, an energy system with high temperature proton exchange membrane fuel cell (HT-PEMFC) as the core was proposed and analyzed, and the all-vanadium redox flow battery (VRFB) was used as the energy storage device, which made up for the defects of the system in meeting the load demand. The working principle and output performance of HT-PEMFC and VRFB were analyzed. At the same time, the relevant evaluation indicators were determined to explore the optimal configuration of the system, and the relationship between the fuel cell load rate and operating efficiency was analyzed. The upstream hydrogen consumption was also taken into consideration. The configuration optimization of hybrid energy system with fuel cell as the main supply power was discussed. The results show that when the fuel cell load rate is 22% and total efficiency is 41%, the total annual cost is the minimum. Compared with the full load condition, the system investment cost is increased by 212.5%, but the fuel cost is decreased by 41.7%. The overall system gain is obvious.

Key words: high temperature proton exchange membrane fuel cell (HT-PEMFC), vanadium redox flow battery (VRFB), benefit evaluation, energy configuration

CLC Number:

TK 01

Yakun HUANG, Jinyi LIU, Xiaosong ZHANG. Configuration Optimization of Off-Grid Energy System Based on HT-PEMFC and VRFB[J]. Power Generation Technology, 2022, 43(2): 305-312.

Figures/Tables 9

Fig. 1 Hourly average load demand curve during a day of shopping mall

Fig. 2 Hybrid energy system diagram

Fig. 3 Characteristic curves of HT-PEMFC

Fig. 4 Load rate-efficiency curve

Tab. 1 Key parameters of components

组件	效率/%	成本/ (美元/kW)	替换成本/ (美元/kW)	(运维成本/ 投资成本)/%	寿命/年
HT-PEMFC	28.2~72.9	3 000	3 000	2.5	7
VRFB	90	223	110	1.0	20
DC/DC	95	40	40	0.5	25
DC/AC	95	40	40	0.5	25

Fig. 5 Flowchart of ascertaining the minimal cost system configuration

Fig. 6 Relationship between the rated power and daily hydrogen cost

Fig. 7 Relationship between the rated power and annualized cost

Fig. 8 Relationship between the rated power and total annualized cost

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