A multi-state planning model of integrated power-gas system considering security-constraints and cascading effects

The integration of natural gas and electricity transmission systems has strengthened the interdependence between the two systems. Due to the closely interconnected through the coupling elements between the power system (PS) and the natural gas system (NGS) when a disturbance happens in one system, a series of complicated sequences of dependent events may follow in another system. Therefore, the integrated planning model joints the security-constrained considering cascading effects is proposed in this paper. Meanwhile, natural gas and electricity transmission systems considering stochastic failures and various operating characteristics of components can be viewed as multi-state systems. Moreover, power-to-gas (P2G), as a promising technology proposed to store surplus renewable energy, is considered in the integrated planning. Firstly, multi-state models for different components are developed to describe the realistic operating condition in natural gas and electricity transmission systems. Furthermore, a mixed-integer linear programming (MILP) approach considers N-1 contingency and cascading effects between the natural gas and the electrical power systems. Therefore, the security-constrained integrated planning model of natural gas and electricity transmission systems is represented. The proposed methods are validated using the integrated gas and power test system.