Abstract
A detailed investigation of the interaction between natural gas and power systems is necessary, due to the increasing interdependency of these vectors, especially in the context of renewable generations integration growth into the grid. In this study, an outer approximation with an equality relaxation decomposition method is proposed to solve a mixed-integer non-linear problem representing the operation of coupled natural gas and power systems. The proposed coupled modelling of natural gas and power systems is compared to decoupled operational modelling. It is demonstrated that operating gas and electricity as a coupled system resulted in about 7% of operational cost savings. In addition, the value of gas-related flexibility options, including flexible gas compressors, flexible gas generation plants, and gas interconnections, to the operation of natural gas and power systems is quantified for a 2030 GB energy system. It is shown that if the natural gas and power systems are flexible enough, the operation of the systems in the decoupled approach is almost the same as the coupled model and therefore there is no need to reform the current energy market framework to make the systems fully coupled.
Highlights
1.1 Interaction between natural gas and power systemsIn GB, natural gas supplies a substantial amount of energy used for heating (278 TWh in 2014) and power generation (218 TWh in 2014) [1]
The main reason for using the decomposition method is to improve the computational performance of the optimisation
All flexible (Flex-5% and Flex-10%): In these cases, all abovementioned flexibility options with 5 and 10% increased gas imports is considered. These cases are derived to see how different flexibility options related to the natural gas system, including flexibilities provided to the natural gas system infrastructure and more FlexGPs can smooth the interaction between natural gas and power systems
Summary
In GB, natural gas supplies a substantial amount of energy used for heating (278 TWh in 2014) and power generation (218 TWh in 2014) [1]. A security-constrained unit commitment model considering natural gas transmission constraints is proposed in [4, 5] In this model, the scheduling problem of gas and electricity systems is solved using an iterative approach, i.e. the power system optimal dispatch problem was solved first and gas demand for electricity generation was used in the gas network model for a feasibility check. The optimisation problem for the coordinated operation of coupled natural gas and power systems is a mixed integer non-linear programming (MINLP), due to binary variables in the UC constraints of generating units and non-linear equations in natural gas system dynamics. In the context of coordination of gas and electricity systems, in [29], optimal operation of natural gas and power systems in the presence of a large capacity of wind was assessed through a combined gas and electricity network (CGEN) model In this model, to avoid computational complexity, UC constraints were not taken into account. A decomposition method is implemented to solve separately the gas network subproblem and electricity network sub-problem
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