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| A Day-Ahead Dispatching Method of Regional Integrated Electric-Hydrogen Energy Systems Considering the Heat Recycle of Hydrogen Systems |
| Luo Xiao1, Ren Zhouyang1, Wen Zihao1, Zhang Pan2, Wang Hao1, Yang Zhixue1, Zhang Jiyue1 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing 400044 China;
2. Guangxi Power Grid Co. Ltd Nanning 530000 China |
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Abstract Developing regional integrated electric-hydrogen energy system is the key path to realize green and low-carbon transformation of energy systems. The flexibility and economy of integrated energy systems are impacted by the thermal characteristic of hydrogen energy systems. Unfortunately, the heat recycle of hydrogen energy systems is ignored by the existing dispatching methods, which leads to the decrease of energy efficiency and economic benefits. In addition, the heat characteristics of hydrogen energy equipment are not fully considered, which means the flexibility of hydrogen energy systems cannot be captured and utilized in the coordinated operation of integrated electric-hydrogen energy systems. Hence, a day-ahead dispatching method of regional integrated electric-hydrogen energy systems considering hydrogen system heat recycle is proposed in this paper. The heat recycle characteristics of hydrogen energy systems are modeled and considered to improve the secure and economical operation of integrated electric-hydrogen energy systems.
The operation characteristics of electrolysers are analysed and modelled according to the principle of electrolytic reaction and thermodynamic equation. An operation model for electrolysers is then developed considering the multiple operation modes of electrolysers. Based on the thermochemical equations of methanation reactions, an operation model for methanation equipment is proposed considering its multiple operation models. Then, an operation model of hydrogen energy systems is presented considering heat recycle.
An optimal dispatching model for integrated electric-hydrogen energy systems is proposed considering the heat recycle of hydrogen energy systems. The objective function is set as the minimized operation cost of the integrated electric-hydrogen energy systems, which includes carbon emission cost, operation and maintenance cost, energy purchase cost, and the profits of energy sale. A heat distribution system model is presented considering the heat recycle of hydrogen energy systems. A big-M based linearization method is proposed to transform the nonlinear heat distribution model into a linear model. The secure operation constraints of integrated electric-hydrogen energy systems are formulated in the proposed dispatching model, which include the operation constraints of heat distribution systems and power distribution networks, power flow balance constraints, gas flow balance constraints, the operation constraints of combined heat and power units, hydrogen storage tanks, methanation equipment, fuel cells and electrolysers.
Two standard test systems are used to validate the effectiveness and advantages of the proposed dispatching method. Four scenarios are designed and simulated whether considering heat recycle of hydrogen energy systems. The following conclusions can be drawn from the simulation results.
(1) The electrolyser has the capabilities of flexible electric-heating regulation and heat storage. The heat recycle of electrolyser can be controlled to enhance the coordinated operation of heat distribution system, power distribution network and hydrogen energy system according to the external energy demands. The energy utilization efficiency of the integrated electric-hydrogen energy system can be improved. (2) The energy efficiency of hydrogen energy equipment can be largely improved by considering heat recovery. The heat recovery ability of low-temperature electrolyser is stronger than that of high-temperature electrolyser. (3) The operational flexibility and cost of electric-hydrogen regional integrated energy system are enhanced and the amount of abandoned new energy are reduced by considering the heat recycle of hydrogen system.
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Received: 20 July 2022
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2023, Vol. 38 
