US 12,476,465 B1
Method for power distribution control in microgrid system integrating electricity, hydrogen, and ammonia, and device
Jing Chen, Guangdong (CN); Chihua Lu, Guangdong (CN); Chun Xiao, Guangdong (CN); Hao Zheng, Guangdong (CN); Linqiang Su, Guangdong (CN); Xinbao Wang, Guangdong (CN); Binyu Xiong, Guangdong (CN); Yifei Wang, Guangdong (CN); Xijian Cui, Guangdong (CN); Junbo Fu, Guangdong (CN); Bo Yang, Guangdong (CN); Yonggang Liu, Guangdong (CN); Xixiu Wu, Guangdong (CN); Yuliang Hu, Guangdong (CN); Junjie Zhao, Guangdong (CN); Huchuan Yang, Guangdong (CN); Zhuo Wang, Guangdong (CN); Congding Yang, Guangdong (CN); Xiaoteng Ren, Guangdong (CN); Yanwen Zhang, Guangdong (CN); Hang Shu, Guangdong (CN); and Kai Hu, Guangdong (CN)
Assigned to FOSHAN XIANHU LABORATORY, Guangdong (CN)
Filed by Foshan Xianhu Laboratory, Guangdong (CN)
Filed on Jul. 11, 2025, as Appl. No. 19/266,339.
Claims priority of application No. 202410953274.6 (CN), filed on Jul. 16, 2024.
Int. Cl. H02J 3/38 (2006.01); G05B 17/02 (2006.01)
CPC H02J 3/38 (2013.01) [G05B 17/02 (2013.01); H02J 2300/24 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A method for power distribution control in a microgrid system integrating electricity, hydrogen, and ammonia, wherein the microgrid system comprises: a direct current (DC) bus; an energy router; an ammonia cracking hydrogen production system; a hydrogen storage system; and a photovoltaic generation system, a water electrolysis hydrogen production system, a hydrogen fuel cell system, an electrochemical energy storage system, and a DC load, which are connected to the DC bus through the energy router; wherein the DC bus is connected to an external alternating current (AC) bus through the energy router, the ammonia cracking hydrogen production system and the hydrogen storage system are respectively connected to the external AC bus, the ammonia cracking hydrogen production system and the water electrolysis hydrogen production system are respectively connected to the hydrogen storage system, the hydrogen storage system is connected to the hydrogen fuel cell system, and the hydrogen storage system and the electrochemical energy storage system constitute a hybrid energy storage system, and the method comprises:
acquiring an output power of the photovoltaic generation system and a power of the DC load, to determine a charge/discharge power of the hybrid energy storage system;
acquiring a state of charge (SOC) value of the electrochemical energy storage system and a state of health (SOH) value of the hydrogen storage system, to determine a power distribution control strategy for the microgrid system in combination with the charge/discharge power of the hybrid energy storage system; and
adjusting an operating status of the microgrid system according to the power distribution control strategy,
wherein determining a power distribution control strategy for the microgrid system comprises:
acquiring a normal SOC range (SOCmin, SOCmax) of the electrochemical energy storage system and determining a first relationship between the SOC value of the electrochemical energy storage system and the normal SOC range;
acquiring a normal SOH range (SOHmin, SOHmax) of the hydrogen storage system and determining a second relationship between the SOH value of the hydrogen storage system and the normal SOH range;
in response to the charge/discharge power of the hybrid energy storage system being greater than zero, determining a first power distribution control strategy according to the first relationship and the second relationship, wherein the first power distribution control strategy comprises controlling the electrochemical energy storage system to be charged and/or controlling the water electrolysis hydrogen production system to produce hydrogen; and
in response to the charge/discharge power of the hybrid energy storage system being less than zero, determining a second power distribution control strategy according to the first relationship and the second relationship, wherein the second power distribution control strategy comprises controlling the electrochemical energy storage system to discharge and/or controlling the hydrogen fuel cell system to generate electricity;
wherein the first power distribution control strategy further comprises:
in response to SOC(t)≤SOCmin and SOH(t)≤SOHmin, or in response to SOCmin<SOC(t)<SOCmax, SOHmin<SOH(t)<SOHmax, and the charge/discharge power of the hybrid energy storage system being greater than or equal to a rated maximum output power of the electrochemical energy storage system, setting the rated maximum output power of the electrochemical energy storage system as a first power reference value, setting a difference between the charge/discharge power of the hybrid energy storage system and the rated maximum output power of the electrochemical energy storage system as a second power reference value, controlling the electrochemical energy storage system to be charged according to the first power reference value, and controlling the water electrolysis hydrogen production system to produce hydrogen according to the second power reference value;
in response to SOC(t)≤SOCmin and SOHmin<SOH(t)<SOHmax, or in response to SOC(t)≤SOCmin and SOH(t)≥SOHmax, or in response to SOCmin<SOC(t)<SOCmax and SOH(t)≥SOHmax, setting the charge/discharge power of the hybrid energy storage system as a third power reference value, and controlling the electrochemical energy storage system to be charged according to the third power reference value;
in response to SOCmin<SOC(t)<SOCmax and SOH(t)≤SOHmin, or in response to SOC(t)≥SOCmax and SOH(t)≤SOHmin, or in response to SOC(t)≥SOCmax and SOHmin<SOH(t)<SOHmax, controlling the water electrolysis hydrogen production system to produce hydrogen according to the third power reference value;
in response to SOCmin<SOC(t)<SOCmax, SOHmin<SOH(t)<SOHmax, and the charge/discharge power of the hybrid energy storage system being less than the rated maximum output power of the electrochemical energy storage system, controlling the electrochemical energy storage system to be charged according to the third power reference value; and
in response to SOC(t)≥SOCmax and SOH(t)≥SOHmax, setting a product of the charge/discharge power of the hybrid energy storage system and a given consumption coordination coefficient as a fourth power reference value, and controlling the water electrolysis hydrogen production system to produce hydrogen according to the fourth power reference value.