Abstract
The interconnection and coordinated operation of electricity-gas integrated energy system (EGIES) is becoming a trend. The flexible energy conversion achieved by gas-fired power generation (GPG) and power to gas (P2G) has brought a new opportunity for improving the reliability of both electricity and gas systems in EGIES and enhancing the ability in absorbing fluctuant renewable energy. In this paper, a reliability evaluation framework for EGIES with the high nonlinearities of gas system components and the assessment of wind power absorption is proposed. To capture the practical operation behaviors of gas system, the highly nonlinear characteristics of gas system components are accurately modeled and incorporated into the proposed sequential simulation process. To address the convergence difficulties caused by the high nonlinearity of energy flow equations, an improved energy flow calculation algorithm based on a relaxation idea is presented, achieving an effective convergence acceleration in the reliability evaluation of EGIES. The validity and performance of the proposed method are verified by using the RBTS integrated with a gas network.
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