Differential evolution based economic dispatch of cogeneration power plants with wind power

Pao Yue-kong Library Electronic Theses Database

Differential evolution based economic dispatch of cogeneration power plants with wind power


Author: Wang, Danqi
Title: Differential evolution based economic dispatch of cogeneration power plants with wind power
Degree: M.Sc.
Year: 2012
Subject: Electric power systems.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: 78 p. : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2649312
URI: http://theses.lib.polyu.edu.hk/handle/200/7312
Abstract: In electrical power engineering, economic dispatch is to find the optimal allocation among all available units to serve the system load at minimum fuel cost. It is essential to dispatch units economically in power system, just for the goal of benefit maximum. Meanwhile, the popular trend of cogeneration comes into the public, for high demand in energy efficiency improvement. Cogeneration is referred to as the conversion of one energy source into two or more different forms of energy, commonly heat and power. Nowadays, economic dispatch on cogeneration power plants tends to be major developments for system operation. For the sake of the maximum profit, industrial site and residential adopt the combined heat and power economic dispatch (CHPED). The demands for heat and electricity can be variable very much according to different seasons and areas. Therefore, it is necessary to have a scheduled dispatch plan. The CHPED model is built to reach the schedule orders as well as improve the rate of energy usage. So cogeneration dispatch is considered as a relatively new field of research deserving further investigation, though a few pioneering works on this topic have already been done. This thesis mainly investigates the optimal dispatch of cogeneration plants based on the CHPED model, taking wind power penetration into account. The differential evolution (DE) algorithm, which is an efficient evolutionary computation technique, is adopted to solve the optimization model. Several steps have been taken to accomplish the research objective towards optimal dispatch of cogeneration plants: Firstly, literature review on economic dispatch, cogeneration and optimization methods have been carried out separately. Understanding of these important topics forms foundations for further research. Secondly, the mechanism behind cogeneration system and DE algorithm are studied so as to combine these together, and then forming a mathematic model based on a real case. Lastly, simulations of a micro-grid system have been made and the results are analyzed in details to demonstrate the effectiveness of the developed model. In this thesis, the aim is to make the total cost to the minimum, by meeting all system demand, and available operation capacity. All these rely on dispatching units according to the practical demand. Also, the fuel cost characteristic of different units can play an important role in the dispatching results. Based on the DE algorithm, and several feasible scenarios for the IEEE 30-bus with wind power have established and simulated to validate the effectiveness of the developed model.

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