مهندسی دریا
m y; Ehsan Gharibreza
Abstract
The ultimate goal of the electrical industry is to supply reliable energy. Therefore, accurate and on time detection of faults have always been the main concern of electricical utility users. In recent years, the use of cables has grown steadily and has made it difficult to detect faults and locations. ...
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The ultimate goal of the electrical industry is to supply reliable energy. Therefore, accurate and on time detection of faults have always been the main concern of electricical utility users. In recent years, the use of cables has grown steadily and has made it difficult to detect faults and locations. If the cable network is intended for a particular application, such as a generator connection cable to industrial power grid, its importance will be increased, and the Lack of timely performance of the protection system will cause irreparable damage. In this paper, a novel method is proposed for detecting and determining the location of faults in cable using a combined wavelet transform algorithm and an optimized MLP network with a bee algorithm. In the proposed algorithm, two initialization modules and prediction analyzes are proposed to increase the selection capability. The algorithm is done by the DigSILENT and MATLAB software and implemented on the ship industrial cable network. The simulation results indicate an accuracy of 93% for the considered algorithm in determining the correct location of the fault.
مهندسی دریا
mohammad pour amiran; mohammad yousefikia
Abstract
: In this research, reactive power compensation in the ship is considered as an auxiliary factor for improving generator conditions and improving the ship efficiency in terms of fuel consumption and emissions. To accomplish this purpose, a simplified electrical network is modeled for an all-electric ...
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: In this research, reactive power compensation in the ship is considered as an auxiliary factor for improving generator conditions and improving the ship efficiency in terms of fuel consumption and emissions. To accomplish this purpose, a simplified electrical network is modeled for an all-electric military marine vessel, including propulsion load, distribution loads, sensors, emergency loads and pulse loads (rail guns, aircraft launchers, etc.) Among these loads, pulsed loads have a more damaging effect on the voltage profile of power quality in the ship distribution system. Such loads often require high energy over a short period of time, which mainly causes problems in system power quality and in some cases leads to the destruction of the entire electrical system.In the following, the compensation effect of static capacitors is investigated on voltage profile improvement of a navy ship during a pulse load. The obtained result show that using their kind of compensating has a great impact on decreasing voltage sag and, on the other hand, the speed and torque curves of the propulsion motors will be more stable. All simulation is done in Matlab/Simulink environment and for various situation (different pulse load and static capacitors). Suggested method is robust and improve the parameters of power quality in all proposed scenarios.