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Porkar Rezaeiye Payam Sharifi Arash Rahmani Amir Masoud Dehghan Mehdi 《The Journal of supercomputing》2021,77(12):14207-14229
The Journal of Supercomputing - With the expansion in the use of IoT, increasing the efficiency of these networks has become even more significant. Objects need reliable communications at suitable... 相似文献
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Porkar B. Vakilian M. Iravani R. Shahrtash S.M. 《Power Systems, IEEE Transactions on》2008,23(3):966-974
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S. Porkar A. Abbaspour-Tehrani-fard P. Poure S. Saadate 《Electrical Engineering (Archiv fur Elektrotechnik)》2011,93(1):23-32
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 problems. DG is introduced as an attractive planning option with competition of voltage regulator
devices and interruptible load. In mathematical model, the object function includes investment costs, which are evaluated
as annualized total cost, plus total running cost as well as cost of curtailed loads and losses. This model identifies the
optimal type, size and location of the planning options. In the studies presented in this paper also the fluctuation of load
and electricity market price versus time period and the effect of DG placement on system improvement are considered. To solve
the proposed mathematical planning model a new software package interfacing MATLAB and GAMS is developed. This package is
enabling to solve large extent distribution system planning program visually and very fast. The proposed methodology is tested
in the case of the well-known IEEE 30-bus test system. 相似文献
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This paper introduces a new framework included mathematical model and a new software package interfacing two powerful softwares (MATLAB and GAMS) for obtaining the optimal distributed generation (DG) capacity sizing and sitting investments with capability to simulate large distribution system planning. The proposed optimization model allows minimizing total system planning costs for DG investment, DG operation and maintenance, purchase of power by the distribution companies (DISCOs) from transmission companies (TRANSCOs) and system power losses. The proposed model provides not only the DG size and site but also the new market price as well. Three different cases depending on system conditions and three different scenarios depending on different planning alternatives and electrical market structures, have been considered. They have allowed validating the economical and electrical benefits of introducing DG by solving the distribution system planning problem and by improving power quality of distribution system. DG installation increases the feeders’ lifetime by reducing their loading and adds the benefit of using the existing distribution system for further load growth without the need for feeders upgrading. More, by investing in DG, the DISCO can minimize its total planning cost and reduce its customers’ bills. 相似文献
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S.?Porkar G.?B.?GharehpetianEmail author K.?Feser 《Electrical Engineering (Archiv fur Elektrotechnik)》2004,86(5):261-265
Impulse tests are performed on power transformers to assess their insulation integrity. During these tests, impulse voltages are applied, and the resulting voltage and current waveforms are recorded. After postprocessing of these data, the presence of faults in the winding should be detected. Different methods and models have been developed for pattern recognition of transformer winding current and classification of impulse faults, . The drawback of these methods is the representation of a fault as a short circuit with constant conductance. In this paper, the breakdown and arc were modeled to represent a more realistic fault during impulse tests. Using this model, it is possible to generate more realistic data, which are necessary to develop more reliable fault-detecting algorithms and, as a result, better pattern recognition and classification of impulse test waveforms. The model has its roots in the classical Mayr equation, and it is simulated with TACS and MODELS modules in EMTP. The simulation results verify the ability of the suggested method to represent disk-to-disk breakdown and arc fault during impulse testing. 相似文献
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