Research on Coordinated Control Strategy of Hydrogen-Electric Hybrid Energy Storage Microgrid Based on Exponential-Function-Based Droop Control

doi:10.11930/j.issn.1004-9649.202209002

Abstract

Abstract: With the rapid development of multi-energy hybrid energy storage technology, hydrogen-electric hybrid energy storage system will become increasingly important to solve the intermittency and volatility problems of grid-connected renewable energy generation. In this paper, the theoretical open-circuit voltage of PEM electrolysis hydrogen production is derived by applying the principle of thermodynamics, and the expected actual voltage is obtained through the integration of different overpotentials as the function of current. An electrochemical model conforming to the output characteristics of hydrogen production voltage is established. Then, based on the analysis of the typical architecture of hydrogen-electric hybrid energy storage microgrid, the exponential-function-based sagging control strategy considering battery SOC is proposed, such that the SOC balance problem during battery parallel charging and discharging can be resolved while maintaining the bus voltage stability of microgrid. Finally, in combination with the adaptive control methods of photovoltaic and electrolytic hydrogen production units, the operation of microgrid is distinguished into four working modes according to the charging and discharging state of the battery, and the related simulation analysis is carried out. The results show that the exponential-function-based sagging control strategy considering the battery SOC can make the microgrid achieve smooth transition between working modes. Particularly adaptive power distribution can be implemented when the photovoltaic power supply fluctuates. Therefore both the system economy and energy utilization efficiency are effectively improved.

Key words: energy storage, exponential droop control, coordination control, hydrogen electric coupling

WANG Jihua, YE Xiaming, QIN Ruyi, YING Fangyi, YU Jiajie. Research on Coordinated Control Strategy of Hydrogen-Electric Hybrid Energy Storage Microgrid Based on Exponential-Function-Based Droop Control[J]. Electric Power, 2023, 56(7): 43-53.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202209002

https://www.electricpower.com.cn/EN/Y2023/V56/I7/43

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