Abstract
Integrated energy system (IES) can realize the comprehensive utilization of different energy sources and contribute to energy efficiency and flexibility, which is helpful for reducing environmental pressure. However, the energy flow calculation becomes very complicated due to the coupling relationship of different energy systems in IES. When conducting security assessment, all accident scenarios in a contingency accident set need to be investigated until the accident set is empty. Therefore, the calculation speed of a single accident scenario and the number of accident scenarios in the accident set significantly determine the whole security assessment time. To achieve real-time security assessment, the concept of load cut set is defined based on the graph theory to reduce the accident number in an accident set. Moreover, a method of network equivalence is proposed to reduce the computation time of a single accident scenario.
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