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Please enable javascript in your browser. Simple search Search result. Type Title Author Publisher Pub. Year Subjects Call Number. H ; Sharif University of Technology Abstract This paper proposes a dynamic time simulation model for long-term generation capacity investment decisions in the presence of either perfect or imperfect electricity market.

The model is based on system dynamics concept in which the dynamics of capacity construction is traced using the forecast of electricity price cleared in the short-term electricity market. Both the perfect and kharrati trading options competitions are considered and a market power index is defined to evaluate the competition level of the electricity market.

The short-term and long-term dynamic analysis are used to represent the generation firms' behavior in bidding strategy and capacity investment, respectively. Abstract This paper investigates various approaches to relieve the transient stability kharrati trading options in restructured power systems.

The approaches adopted fall into two broad categories: The latter group can, on the other hand, emerge in the form of a pool-protected policy in which the bilateral contracts are rescheduled to maintain the stability or in the form of a contract-protected policy in which the realizable bilateral contracts are maximized while minimizing the rescheduling in pool market.

Transient energy kharrati trading options TEF method is used as a tool to calculate the Impact of penalty-reward mechanism on the performance of electric distribution systems and regulator budgetArticle IET Generation, Transmission and Distribution ; Vol. Abstract As a part of the ongoing debate about competition in the electricity industry, regulators are increasingly considering performance-based regulation PBR as an alternative to improve the service quality.

The fundamental principle behind PBR is that good performance should lead to kharrati trading options profits, and poor performance should result in lower profits. A penalty-reward structure PRS kharrati trading options a PBR mechanism can enhance utility performance to align utility interests with customer's interests. During the implementation of PBR, regulators should spend or receive money to reward good performed utilities or penalised poor performed utilities, respectively.

A technique is proposed, in this study, to not H ; Sharif University of Technology. Abstract This paper proposes a time simulation model for long-term wind capacity investment decisions in the presence of electricity market and tradable green certificate TGC market.

Investment decisions and wind capacity development are fundamentally based on incentives gained from both these markets. In TGC market, the tradable certificates are issued to renewable generation companies for each megawatt-hour of electricity generation.

Distribution companies are obligated to support fraction of their electricity consumptions from renewable sources. The dynamics of prices in both markets are simulated in a system dynamics model to trace the dynamics of wind capacity investment.

Such a decision model Abstract This paper studies the economic impact of using inaccurate price forecasts on self-scheduling of generation companies GenCos in a competitive electricity market. Four alternative sets of price forecasts are used in this study which have different levels of accuracy. The economic impact of price forecast inaccuracies is calculated by comparing the economic benefits of the GenCos in two self-scheduling scenarios.

In the first scenario, electricity market price forecasts are used to optimally schedule the GenCos' next day operation. In the second scenario, perfect price forecasts, i. Two indices are kharrati trading options to quantify the Abstract This paper proposes a decentralized market-based model for long-term capacity investment decisions in a liberalized electricity market.

Investment decisions are fundamentally based on total revenues gained by investors. In most electricity markets, the complementary mechanisms are designed to ensure a desired level of reliability while covering investment costs of the suppliers. In such an environment, investment decisions are highly sensitive to expectation of price signals in both of energy market and capacity mechanisms. In this work, the system dynamics concepts are used to model the structural characteristics of electricity market such as, long-term firms' behavior and relationships Abstract Competition kharrati trading options the electric kharrati trading options industry urges utilities to not only reduce the investment costs, but also to reasonably cut the operation and maintenance expenses as much as possible, while keeping both power quality and reliability requirements met.

Kharrati trading options maintenance RCM has been proven to be in response to this dilemma in power systems and has been yet successfully applied in various engineering contexts. Kharrati trading options study introduces a novel approach, as of the first steps of RCM implementation in composite power generation and transmission systems, to identify the critical components for the main sake of a more focused maintenance management.

Criticality evaluation is, here, Abstract In this paper, a new bidding strategy for pay-as-bid market suppliers is introduced. This method is based on kharrati trading options systematic analysis of interactions of market with the suppliers via several market indices as well as forecasting important indices by artificial neural networks. Besides, the kharrati trading options method considers the practical limitations in the system and deals with incomplete information handling, closely.

Next, a strategic bidding approach is proposed for optimal bidding by the suppliers. In these investigations, the paper focus is on the experimental situation of Iran electricity market as a pay-as-bid market and a sample generating company with several generating units from this market Abstract This paper develops a system dynamics model to analyze the impacts of different kinds of capacity payment as investment incentive mechanisms in Iranian electricity market.

Since it is aimed that the incurred capital and operating costs of generation technologies be recovered in Iranian electricity pool, the noncompetitive capacity payment mechanism has been introduced for kharrati trading options purpose in order to encourage new investments in electric power generation system. In the current mechanism, the capacity payments are designated to the generating units in the whole country electricity market.

An annual base value of capacity payment is proposed based on recovering the capital cost of a benchmark Subsidy cut and its effect on tehran electricity company: Abstract In recent years, subsidy payment has been made a main challenge for governments due to growth of population and energy price in global markets. Targeted subsidy plan has been implemented in Iran since last year, and this article discusses its effects on costs kharrati trading options revenues of Tehran Electricity Company as one of the major subdivisions of Iran's electricity industry.

In the new system, structural changes have been made in electricity tariffs, so it is not possible to predict the future trends in electricity consumption only based on the past consumptions. In order to model the decision making structure in the recent conditions, a system dynamics method is applied. In addition to modeling the Abstract The unbundling of the electricity industry introduced new uncertainties and escalated the existing ones in transmission expansion planning.

In this paper, a multi-stage transmission expansion methodology is presented using a multi-objective optimization framework with internal scenario analysis.

Total social cost TSC kharrati trading options, maximum regret robustness criterionand maximum adjustment cost flexibility criterion are considered as three optimization objectives. Kharrati trading options are considered by defining a number of scenarios. A multistage model for distribution expansion planning with distributed generation in a deregulated electricity marketArticle Iranian Journal of Science and Technology, Transaction B: Abstract Distribution systems management is becoming an increasingly complicated issue due to the introduction of new technologies, new energy trading strategies and a kharrati trading options deregulated environment.

In the new deregulated energy market and considering the kharrati trading options coming from the technical and economic fields, it is reasonable to consider Distributed Generation DG as a viable option for systems reinforcement in competition with voltage regulator devices, to solve the lacking electric power supply problem and meet the load growth requirements with a reasonable price as well as the system power quality problems.

The problem of optimal placement and size is formulated in two stages; minimization of Abstract In a medium term planning horizon, a retailer should determine its forward contracting and pool participating strategies kharrati trading options well as the selling price to be offered to the customers.

Considering a competitive retail electricity market, the number of clients being supplied by any retailer is a function of the selling prices kharrati trading options some other characteristics of all the retailers.

Kharrati trading options paper presents an equilibrium problem formulation to model the retailer's medium term decision making problem considering the strategy of other retailers. Decision making of any single retailer is formulated as a risk constraint stochastic programming problem.

Uncertainty of pool prices and clients' demands kharrati trading options R ; Shams Mousavi, S. M ; Sharif University of Technology. Abstract The power supply of microwave tubes has high voltage and the possibility of produce high power pulse, which called in modulator. In this work, the results of design, construction and characterization kharrati trading options a direct drive pulse modulator for driving high power short pulse-width magnetron are reported.

The sub-assemblies of modulator are; a primary high voltage supply, a switch bank with drivers and snubber circuits, a filament circuit, a digital control circuit with sensors and finally a pulse transformer. This paper is concerned with introduction and presentation of experimental evaluation of a new drive method for kharrati trading options power high voltage modulating-cathode microwave tubes. A ; Sharif University of Technology. Abstract With recent deregulation in electricity industry, price forecasting has become the basis for this competitive market.

The precision of this forecasting is essential in bidding strategies. So far, the artificial kharrati trading options networks which can find an accurate relation between the historical data and the price have been used for this purpose.

One major problem is that, they usually need a large number of training data and neurons either for complex function approximation and data fitting or classification and pattern recognition. As a result, the network topology has a significant impact on the network computational time and ability to learn and also to generate unseen data from training data. Abstract Distribution systems management is becoming an increasingly complicated issue due to the introduction of new technologies, new energy trading strategies and new deregulated environment.

In the new deregulated energy market and considering the incentives coming from the technical and economical fields, it is reasonable to consider distributed generation DG as a viable option to solve the lacking electric power supply problem.

This paper presents a mathematical distribution system planning model considering three planning options to system expansion and to meet the load growth requirements with a reasonable price as well as the system power quality kharrati trading options. DG is introduced as an attractive Abstract Transmission line congestion in electricity market is lead to increase the energy cost and change in local marginal prices.

So, it is probable that the market power is manifested. Market power may prevent the full competition in Electricity Market. Moreover, in this condition, kharrati trading options operating of power system in its boundary conditions, the system may be damaged and the security of the system may be disturbed. On the other hand, decreasing the line flows from their optimal value, cost and consequently, price of energy are increased.

So, there is need to have a compromise between the line flow decrease and the cost those impose. In this paper, a framework for compromising between social cost In the new deregulated energy market and considering the incentives coming from the technical and economical fields, it is reasonable to consider Distributed Generation DG as a viable option to solve the lacking electric power supply problem.

Multi-objective planning model for integration of distributed generations in deregulated power systemsArticle Iranian Journal of Science and Technology, Transaction B: Abstract This paper presents a long-term dynamic multi-objective model for distributed generation investment. The proposed model optimizes three objectives, namely active losses, costs and environmental emissions and determines the optimal schemes of sizing, sitting of DG units and specially the dynamics of investment over the planning period.

The Pareto optimal solutions of the problem are found using a GA algorithm and finally a fuzzy satisfying method is applied to select the optimal solution considering the desires of the planner. The solutions of Pareto optimal front are analyzed to extract general useful information for planners about the appropriate DG technologies and placement schemes.

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Please enable javascript in your browser. Simple search Search result. Type Title Author Publisher Pub. Year Subjects Call Number. Thesis Sharif University of Technology Rahmani, Saeed Author ; Ehsan, Mehdi Advisor Abstract In a deregulated environment of power distribution industry, a comprehensive economic evaluation for the implementation of distribution automation systems is inevitable. It plays a key role in enabling distribution companies to achieve their business goals.

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