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In this thesis, a dynamic economic evaluation is presented to provide a comprehensive perception of automation intensity level and investment plan, for maximizing the utility profit and obtaining the desired payback period. Using the presented methodology in this thesis and system dynamics approach, it is efficiently possible to deal with variation of the economic parameters such as the interest rate, inflation rate, energy supply cost, Electric power generators and users engage in power transactions which take place over the transmission system and create losses.
Unfortunately, losses are expressed as a nonlinear function of line flows, and it becomes almost impossible to calculate exactly the losses that are incurred by each generator, Thesis Sharif University of Technology Sarparandeh, Mohammad Hossein Author ; Ehsan, Mehdi Advisor Abstract In order to reduce damage caused by power outages on rare events that lead to long-term disconnection of microgrid from utility grid, isolated mode performance of microgrids including wind and hudro turbines with energy storage systems is considered in this study.
Using wind energy as a renewable resource is considered as an appropriate choice for power production in microgrids. However, the uncertainty in wind turbines power generation is something challenging. The existence of water resources near the wind farms causes a special opportunity for operation of these resources along with wind turbines. This thesis aimed at balancing energy supply and demand in island mode of microgrid, Thesis Sharif University of Technology Kharraty, Saeed Author ; Ehsan, Mehdi Advisor Abstract Restructuring and privatization in power system such as any industry leads to better market operation and more social welfare.
Since two decade the power system in many countries have changed from monopoly to free market. In a restructured network the technical and economical aspects should be considered together. Ancillary services are needed for any power system to be operated in an optimal and secure manner. Reactive power and voltage regulation is one of the most important ancillary services in the network.
The cost of purchasing reactive Since it has high energy efficiency and low installation time, it is an appropriate approach in energy management of residential complexes. In this project, stochastic programming based on Monte Carlo approach is used to handle uncertainties in the optimal sizing of CHP for residential complexes. Availability of CHP, boiler and AC bus as well as the electrical and thermal load forecast errors are considered as stochastic variables.
Minimizing system total cost considering the probability of each scenario obtained from the scenario reduction algorithm is the objective function.
Dissertation Sharif University of Technology Soroudi, Alireza Author ; Ehsan, Mehdi Advisor Abstract The process of deregulation that has involved electricity many markets has introduced several new interesting research topics in power system area.
This thesis addresses one of the most fascinating issues among them: From the distribution network operator DNO 's point of view, it is of interest to develop a comprehensive methodology which considers various distributed generation technologies as an option for supplying the demand in distribution networks. In this thesis, the planning problem has been multi-objectively modeled. This will help the planner in decision making while knowing Thesis Sharif University of Technology Givehei, Mohammad Reza Author ; Ehsan, Mehdi Advisor Abstract The analysis of electrical energy consumption parameters such as rate and amount of consumption, plays an important role in the planning of power systems.
Because the dynamic analysis and evaluation of these parameters provides a detailed forecast of consumption and power system load. Given that the electrical energy consumption system can be thought as a dynamic system, System Dynamics SD method would be very appropriate for modeling and analyzing its behavior. In this thesis, based on the SD and by means of dynamic loops, a comprehensive dynamic system for electrical energy is introduced.
In this project, SCUC is also uses for simultaneous clearing of energy and reserve market. Spinning reserve and of generating units and Interruptible Loads IL are considered as system operating reserves in the proposed model. Some of IL usage restrictions such as maximum load curtailed, maximum curtailment hour in a day, maximum length of each curtailment and etc is also considered. Thesis Sharif University of Technology Rezaei Benam, Masoud Author ; Ehsan, Mehdi Advisor Abstract Cogeneration or combined heat and power CHP which simultaneously produces electricity and heat energy from sequential use of single fuel source, has been introduced increasingly for industrial, commercial and residential applications due to its high energy efficiency.
While the capital costs of CHP systems are comparatively higher than the conventional systems, their proper selection and optimal sizing and also optimal operation could result in shorter capital recovery period and lower cost of energy supply.
Essentially the technical, economic and environmental performances of CHP system are closely dependent on its design and operation strategy. This project presents an optimization Thesis Sharif University of Technology Kazemi, Mostafa Author ; Ehsan, Mehdi Advisor Abstract Since s the electricity market has been gradually evolving from a monopoly market into a liberalized one for encouraging competition and improving efficiency. Error of determining day-ahead electricity price is one of the sources of the risk.
Energy price has a high impact on bidding strategy optimization process. So it should be determined with low error which is not Thesis Sharif University of Technology Mahmoodzadeh, Zahra Author ; Ehsan, Mehdi Advisor Abstract Losses are unavoidable in any parts of power systems, from generation to receiving nodes and occur in transmission and distribution networks.
However, the main loss component is produced in distribution networks. Energy losses in distribution networks are an important indicator for the planning and operation of the system. A fast, reliable and accurate energy loss calculation method is required for optimal operation of the distribution networks.
Energy loss depends on network's operating conditions. Loads values and loads factors are time variables; therefore, methods based on probability Dissertation Sharif University of Technology Ghofrani Jahromi, Zeinab Author ; Ehsan, Mehdi Advisor Abstract One of the topics that has been given great consideration after restructuring and smart grid emergence, is loss management. In this thesis, distribution loss is studied and its affecting factors are analyzed. Then loss optimization and loss cost allocation to distribution consumers are studeid.
In order to acheive these two goals, it is neccessary for the distribution system to have the capabilities of a smart grid. The subjectof distribution reconfiguration is duiscussed as one of the loss reduction methods. Traditional reconfiguration problem trend The assumed market structure of this thesis, considers day-ahead energy market and balancing market, simultaneously.
The stochastic model of this, implements a robust function to face the uncertainties of these markets. Finally the allowable percent of each uncertain parameters are introduced to met an specific level of profit for the company. Thesis Sharif University of Technology Abbaskhani Davanloo, Arash Author ; Ehsan, Mehdi Advisor Abstract As electric energy loss in Iran is around 31 percent and 01 percent of this loss is related to the distribution of electric energy, management and operation of distribution network is of high importance.
There are different ways for operating the distribution network while decreasing the loss, such as using capacitors, tap changers, energy storing devices, distributed generations, etc. One of the most common ways is to use Network Reconfiguration.
In this thesis, daily reconfiguration of a kV bus distribution network is investigated. The objective function consists of cost of energy loss and improvement of voltage profile. Wind turbines are used as the sources of distributed generation Thesis Sharif University of Technology Farmahini Farahani, Ehsan Author ; Ehsan , Mehdi Advisor Abstract In a centralized power system, the system operator, derives a maintenance scheduling plan that maximizing reliability of system and minimizing operating cost.
Therefore there are two objective functions for finding an optimum maintenance schedule in restructured power system. This thesis proposes a new method for maintenance scheduling of generation units in a restructured power system.
In fact, transmission expansion planning is to determine when, where and how many lines need to be added to power system with a minimum of investment and operating costs.
In this thesis, transmission expansion planning has been performed at uncertainty in generation and N-1 criterion condition where uncertainty in generation means uncertainty in the moment of adding power plant to power system. In previous studies, transmission expansion planning was performed with DC-load flow in which, the power loss and voltage profiles were ignored due to the approximation in the Dissertation Sharif University of Technology Kharrati, Saeed Author ; Ehsan , Mehdi Advisor Abstract Electricity retailers are one of the power market entities which act as an intermediary between the producers in the wholesale market and the consumers in the retail side.
The main task of a retailer in the power market is to set contract with the consumers to supply their electricity during a pre-specified time period and to participate in the wholesale market to supply the electricity needed by its costomers.
Moreover, retailer can supply its This has caused a fast growth in the amount of renewable energy installed worldwide especially wind energy over last decades. However, the intrinsic characteristics of wind farms output power, i. Thesis Sharif University of Technology Gilasi, Yasin Author ; Ehsan, Mehdy Advisor Abstract Recent years of capitalism bold role and the competitive environment of variant fields of our life, sparking the idea which considers the electricity one of the most crucial human requirement as a commodity of a competitive market to be traded between confident subscribers by easy access.
Therefore, by converting the exclusive structure of electricity supply system to a competitive one, some new roles are created to fulfill the electricity generation, transmission and distribution processes. Retail is one of the new roles, defined as a power system restructuring development helper by support of electricity trading, which can be involved in different transactions according to the market Thesis Sharif University of Technology Balmaki, Saeed Author ; Ehsan, Mehdi Advisor Abstract In recent years, due to restructuring in the electric power industry, distributed generation has become one of the most important subjects and DGs and renewable energy sources have been increasingly expected as a supplement and an alternative to a conventional large scale central power system.
Photovoltaic system is one of the best RESs for residential electricity supply because it is noiseless and solar power is widely available and households can use it via photovoltaic cells in their homes. There are two major problems