Abstract
This article presents a research on unit commitment(UC), which consider the interaction between conventional power system and district-level integrated energy system(IES). The increasing number and scale of IES projects at distribution network bring incremental effect to the whole energy system. Their influence on power system transmission level unit commitment becomes one of the notable topics. Within these IES projects, gas-power and cooling-heating-power are two main types of `integrated' forms. In this article, a model system is built for UC analysis in which several district-level IESs are connected to a conventional power system. Heating, cooling and electrical forms of energy are integrated in these IESs. The UC problem is modeled and solved by mixed integer linear programming(MILP), the partial load characteristics of these power plants are handled by piecewise linearization. The common piecewise linearization method used in power and gas system is modified to reduce binary variables and constraints. The purpose of this modification is to increase the MILP solving speed. Case studies are carried out to evaluate the influence of IESs on two different time scales. The simulation result shows that the application of IESs can reduce the whole energy system service cost. As the number of applied district-level IESs increases, the cost reduction becomes more significant. The reduction relies on preventing high-cost small capacity plants go into operation, reducing the number of generator startup, and choosing an economical power output level. These benefits are owing to the reinforcement from gas network via CCHPs (Combine cooling, heating and power) and the buffer from multiple forms of energy storage devices (thermal and cooling).
Highlights
Due to the negative effect of global warming, the reduction of greenhouse gas emission is catching more and more attention
combined cooling heating and power (CCHP) provides a plenty of electric, heating and cooling power to reduce the high cost energy bought from power system, which leads to the reduction of high cost generators’ commitment
This article mainly focuses on the incremental influence of the increasing number and scale of IESs on conventional unit commitment in power system
Summary
Due to the negative effect of global warming, the reduction of greenhouse gas emission is catching more and more attention. Integrated energy system provides a smart solution to reduce CO2 emission, improve energy consumption efficiency and reduce the energy supply cost [1]. References [3]–[5] provide district-level IES examples which contain basic elements such as distribute heat and power generators, renewable energy convertors as well as multiple forms of energy storage devices. [7] models a combination of power and heat system, which increase the economic efficiency of the integrated energy system compared with separate power and heat systems. CO2 emission reduction is another common objective function used in previous research, [3] presents an integration of decentralized energy systems including heat, power and distributed renewable energy
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