Abstract
The wide utilization of gas-fired generation and the rapid development of power-to-gas technologies have led to the intensified integration of electricity and gas systems. The random failures of components in either electricity or gas system may have a considerable impact on the reliabilities of both systems. Therefore, it is necessary to evaluate the reliabilities of electricity and gas systems considering their integration. In this paper, a novel reliability evaluation method for integrated electricity–gas systems (IEGSs) is proposed. First, reliability network equivalents are utilized to represent reliability models of gas-fired generating units, gas sources (GSs), power-to-gas facilities, and other conventional generating units in IEGS. A contingency management schema is then developed considering the coupling between electricity and gas systems based on an optimal power flow technique. Finally, the time-sequential Monte Carlo simulation approach is used to model the chronological characteristics of the corresponding reliability network equivalents. The proposed method is capable to evaluate customers’ reliabilities in IEGS, which is illustrated on an integrated IEEE Reliability Test System and Belgium gas transmission system.
Highlights
As a highly efficient and sustainable source of energy, natural gas has become an appealing fossil fuel for electricity generation in various countries
The utilization of GFUs and the development of PTGs have intensified the interaction between electricity and gas systems, and it brings new challenges to the reliability evaluation of integrated electricity–gas systems (IEGSs)
This paper propose a reliability evaluation method for IEGS considering the interaction between electricity and gas systems
Summary
As a highly efficient and sustainable source of energy, natural gas has become an appealing fossil fuel for electricity generation in various countries. An insufficient electricity supply might influence the functioning of gas systems, as the gas injections from PTGs are correlated to their electricity consumptions [7] It is of great significance and requires additional effort to incorporate the interdependency between electricity and gas systems into the reliability evaluation of IEGS. Since GFUs and PTGs have made it possible for bidirectional energy exchange between electricity and gas systems, the reliability of IEGS can be improved if the operation of IEGS is co-optimized in terms of both electricity and gas flows as compared with the separate operation in either system [4]. It is important to consider the economic loss caused by insufficient electricity and gas supply in the reliability evaluation of IEGS.
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