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Showing 2 results for Amini
Mr. Mohammadreza Aminian, Dr. Mehdi Jafari Shahbazzadeh, Dr. Mahdiyeh Eslami, Volume 10, Issue 3 (12-2021)
Abstract
One of the most applicable relays in protecting the power system is distance and overcurrent relays. In transmission and distribution networks, protection is usually performed by distance protection, and overcurrent protection is used as a backup for distance protection. In the present study, a new approach was provided to coordinate distance and overcurrent relays using pickup current, time adjustment coefficient, and overcurrent relay characteristics to delay these relays as backup for distance relays. It is possible to adjust the second zone of the distance relays' operating time with a fixed and normal value using instantaneous operation relays with changes in coordination constraints. In the proposed method, the coordination problem was solved using GA algorithm. A protection coordination index is then provided to evaluate distributed generation sources' impact on the protection coordination of distance and overcurrent relays. A new method was proposed to obtain the maximum injection capacity under coordination constraints using MATLAB and DIGSILENT software's parallel performance. The proposed method was implemented in IEEE 9 and 39 bus sample networks. Finally, the obtained results were compared and evaluated.
Mr Rasol Sareban, Dr Mohmmadreza Amini, Dr Majid Delshad, Dr Mohammad Rouhollah Yazdani, Volume 13, Issue 3 (11-2024)
Abstract
In this study, a novel high step-up converter without utilizing a coupled inductor at the input is presented. The converter incorporates two coupled inductors: one to enhance the voltage gain and the other to facilitate zero-current switching (ZCS) and transfer snubber energy. A lossless snubber is employed to achieve soft-switching conditions. All diodes in the circuit operate under ZCS, effectively eliminating the issue of reverse recovery. The converter features a continuous input current and reduced conduction losses due to low voltage stress on the switches. The proposed converter has been comprehensively analyzed, and a 60 W prototype was simulated in PSPICE and subsequently implemented to validate the circuit analysis. The converter achieves an efficiency of 96% under full-load conditions, representing a 6% improvement compared to a hard-switching boost converter.
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