Economic dispatch analysis of regional Electricity–Gas system integrated with distributed gas injection

With the development of energy conversion technologies such as combined heat and power and gas power generation, various forms of energy, such as the electricity, gas, and heat of regional integrated energy systems have become highly coupled. Aiming at regional electricity–gas systems (REGS), this paper focuses on the interaction between an electricity power system and a natural gas system. A comprehensive analytical model of the REGS combined with distributed gas injection is proposed, where a regional energy station (RES) is considered as an energy coupling link. The REGS's energy flow is optimized to minimize the operation cost of the RES by comprehensively considering the cost of distributed gas injection, the penalty of wind curtailment, and the constraints of the energy network. Furthermore, multiple RESs and distributed gas injections are used as a control to study the effects of various adjustable resources on the economics of REGS′ operating costs, flexibility of renewable energy consumption, and safety of pressure support capabilities. Subsequently, a system optimization scheduling strategy without considering gas injection point and the corresponding strategy considering hydrogen or upgraded biogas as gas injection temperament are studied. Numerical example shows that with the introduction of distributed gas injection points, the economic dispatch strategy considering the upgrade of biogas and hydrogen injection improved the economic, pressure reduction level, and wind power consumption rate of the system, which are important for improving the stability and flexibility of REGSs.