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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Medbiotech Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: reliability,Cost,delivery,wind power,LOLE,EENS
- چکیده:
- چکیده انگلیسی: Energy consumption is one of the criteria for determining the level and quality of life in a country. Continuity of energy supply and long term access to resources needed for a comprehensive energy plan. For this reason, energy planning, the undeniable economic imperative, national and strategic, is considered. In recent years, the production of electricity from wind energy is taken into consideration. Wind turbines are one of the most widely used energy units are in the world. Wind power must be employed in an area that has good potential of wind. The best conditions for installation of wind power are, thus,in remote areas free of obstacles, and consequently with low population density. Reliability benefits, environmental benefits and operating cost savings from wind power integration should be compared with the associated investment costs in order to determine optimum transmission facility for wind power delivery. Determining an adequate transmission system to deliver wind power to a power grid is a difficult problem. Designing a transmission system to match the wind farm’s installed capacity can lead to over investment. In this paper, the reliability indices such as: LOLP, LOLE, EENS, using MATLAB software to COPT table in the presence and absence of wind power is calculated and the results compared. Also, the use of these indicators, the economic analysis of the project is done. Because, designing a transmission system to match the wind farms installed capacity can lead to over investment.
- انتشار مقاله: 09-12-1397
- نویسندگان: Mehrdad Ahmadi Kamarposhti,Fatima Geraeli
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Energy Management and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Energy Center,Simulation of Monte Carlo,Multiple energy carriers,Power generation investment,investment risk
- چکیده:
- چکیده انگلیسی: In this paper, we proposed a financial evaluation method for energy centers with the ability to convert and manage the selection of the type of exhaust fuels. An energy center is an integrated system, for example, a power unit that convert or store multiple energy carriers. Given the flexibility of energy centers to change their output power (s), as well as the uncertainties in some parameters such as the price of energy carriers, inflation, consumption, etc., the value of its investment is uncertain and based on The Monte Carlo simulation is determined. By the Monte Carlo method and the Hull-White-Vasicek method, the price of energy carriers will be estimated in the coming days using data from previous years. This approach has been the ability to adapt flexibly to uncertain and volatile market prices. The estimated price error is shown using the above methods and real data. Then, the model of the proposed energy center is determined by the size of the risk and its profitability.
- انتشار مقاله: 19-08-1396
- نویسندگان: Mehrdad Ahmadi Kamarposhti,Rasoul Salehi Rezveh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Dissolved oxygen,Biological wastewater treatment,Air Nanobubbles,Excess Sludge
- چکیده:
- چکیده انگلیسی: Low efficiency of conventional aeration techniques and the excessive production and disposal of sludge are great concerns in biological wastewater treatment systems. The present study aimed to evaluate the active sludge method using batch reactors under continuous operation to determine the efficiency of aeration and sludge production through microbubble and nanobubble aeration. The results indicated that compared to microbubble aeration, nanobubble aeration increased the concentration of dissolved oxygen in the mixed liqueur of the reactor (from 2 to 4.5 mg/l), while reducing the production of excess sludge from 100 to 40 ml/g (SRT: 15-40 d). With the same SRT duration, these values were within the range of 160-70 ml/g using fine-bubble aeration. According to the results, nanobubble aeration could increase the efficiency of aeration, thereby increasing the capacity of the treatment plant and reducing the costs of biological wastewater treatment.
- انتشار مقاله: 21-03-1397
- نویسندگان: Mehrdad Ahmadi,Gholamreza Nabi Bidhendi,Ali Torabian,Nasser Mehrdadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Dissolved oxygen,Biological wastewater treatment,Air Nanobubbles,Excess Sludge
- چکیده:
- چکیده انگلیسی: Low efficiency of conventional aeration techniques and the excessive production and disposal of sludge are great concerns in biological wastewater treatment systems. The present study aimed to evaluate the active sludge method using batch reactors under continuous operation to determine the efficiency of aeration and sludge production through microbubble and nanobubble aeration. The results indicated that compared to microbubble aeration, nanobubble aeration increased the concentration of dissolved oxygen in the mixed liqueur of the reactor (from 2 to 4.5 mg/l), while reducing the production of excess sludge from 100 to 40 ml/g (SRT: 15-40 d). With the same SRT duration, these values were within the range of 160-70 ml/g using fine-bubble aeration. According to the results, nanobubble aeration could increase the efficiency of aeration, thereby increasing the capacity of the treatment plant and reducing the costs of biological wastewater treatment.
- انتشار مقاله: 21-03-1397
- نویسندگان: Mehrdad Ahmadi,Gholamreza Nabi Bidhendi,Ali Torabian,Nasser Mehrdadi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Industrial Electronics Control and Optimization
- نوع مقاله: Journal Article
- کلمات کلیدی: Active and Reactive Power,Renewable Energy Sources,Interface Grid-Connected Converters,Harmonic Distortion,Parallel Active Filter
- چکیده:
- چکیده انگلیسی: Limitation of fossil fuel reserves and environmental pollution resulting from their use, especially in cities, as well as low efficiency of current energy converters lead to the tendency towards the use of more efficient energy converters and renewable energy sources. The use of distributed generation (DG) is one of the appropriate solutions in this regard. There are various techniques provided to control these converters. In this study a new technique of Direct Power Control (DPC) is proposed to connect distributed generation sources to the nationwide grid. This technique not only adds power of distributed generation sources to the grid, but also is capable to compensate the reactive and harmonic power of non-linear loads as well. In this study, Converters’ voltage references for generating compensation current are directly calculated in synchronous rotating coordinate system in each period of sampling; then, a proper pulse width modulation (PWM) generates the used voltages. The proposed DPC technique has some advantages including simple algorithm of fast dynamic as well as fixed switching frequency and small sampling frequency. The performance of the proposed direct control technique is confirmed by simulation results.
- انتشار مقاله: 23-02-1397
- نویسندگان: Ehsan Talebian Kouchaksaraei,Mehrdad Ahmadi Kamarposhti
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Industrial Electronics Control and Optimization
- نوع مقاله: Journal Article
- کلمات کلیدی: Droop control,distributed generation,Microgrid,islanding,Power Sharing
- چکیده:
- چکیده انگلیسی: Microgrid is defined as a controllable unit which consists of Distributed Generations (DG), loads, energy storages and control devices. Microgrid has two operation modes including grid connected mode and islanding mode. In grid connected mode, voltage and frequency of microgrid is controlled by main grid and DG’s supply total or part of the loads. In the islanding mode, the microgrid is disconnected from main grid because of a fault or a preplanned switching in connecting line. In this mode, DG’s should satisfy the power demand of sensitive loads in microgrid. Since the only generation units in an islanded microgrid are existing DG units which usually are from several types. Consequently besides feeding total loads, voltage and frequency of microgrid should be controlled by these DG units. Hence, the microgrid could supply high power quality and reliability to customers. This paper presents an optimization method to optimize the parameters of the Microgrid controller in islanding mode. The controller optimal parameters have been obtained by using the particle swarm optimization (PSO). This is done based on minimization of the error in the current and voltage controllers. Finally, simulation has been carried out to verify the effectiveness of the optimized controller. Stability analysis of the controller is verified using classical approach.
- انتشار مقاله: 20-12-1396
- نویسندگان: Mehrdad Ahmadi Kamarposhti,Mehrdad Ahmadi Kamarposhti,Mehrdad Ahmadi Kamarposhti,Mehrdad Ahmadi Kamarposhti
- مشاهده