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ABSTRACT
The research on A unit commitment for an integrated energy system (UCIES) presented in this article takes into account how the conventional electricity system interacts with the district-level integrated energy system (IES). The distribution network's growing quantity and size of IES projects has a cumulative impact on the entire energy system. One of the noteworthy aspects is their impact on the transmission level unit commitment of the power system. Gas-power and coolingheating-power are the two primary categories of "integrated" forms in these IES projects. This paper builds a model system for UC analysis that connects numerous IESs at the district level to a traditional electricity supply. These IESs incorporate electrical, heating, and cooling energy sources. Mixed integer linear programming (MILP) is used to describe and solve the UC problem, and piecewise linearization is used to address the power plants' partial load characteristics. In order to decrease binary variables and constraints, the widely used piecewise linearization method is changed. This change is meant to speed up the MILP solution process. To assess the impact of IESs on two different time scales, case studies are conducted. The simulation's outcome demonstrates how applying IESs can lower the cost of maintaining the entire energy system. The cost savings grow more considerable when additional district-level IESs are implemented. The decrease depends on avoiding the beginning of expensive, small-capacity plants, minimizing the number of generators starts, and selecting an affordable. These advantages result from the CCHPs' (Combined Cooling, Heating, and Power) fortification of the gas network and the buffer provided by various types of energy storage devices (thermal and cooling).
