Abstract
Energy supply capability evaluation is of great significance to the planning and construction of integrated energy systems. In existing energy supply capability evaluation methods for the integrated energy systems, N-1 security at peak load is treated as a rigid constraint. It is not conducive to the effective utilization of equipment, and the impact of integrated demand response is not fully considered. To address these problems, this paper proposes a new evaluation method for the energy supply capability of regional electricity-heating energy systems, which models reliability as a flexible constraint and considers integrated demand response. First, this paper defines the energy supply capability of regional electricity-heating energy systems. Considering the structures of electricity and heat distribution networks, a reliable energy supply interval model is constructed. The maximum energy supply capability can be described by the boundary of the energy supply interval. Secondly, the impact mechanism of integrated demand response and multi-energy load transfer on reliability is extensively studied. A solution method of reliable energy supply interval boundary is proposed. On this basis, a fast reliability evaluation method for operating points is proposed. It then quantifies the load that the system can increase or need to reduce under a certain reliability constraint. In the case study, a real regional electricity-heating energy system is used to validate the proposed method. It is found that both relaxing reliability constraints or increasing integrated demand response participation can enhance energy supply capability of integrated energy systems.
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