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Javadi S, Rezaei N, Hesami Naghshbandi A. Design of a New Differential Protection scheme for DC Microgrids Based on Fault Current Components. Journal of Iranian Association of Electrical and Electronics Engineers. 2022; 19 (1) :139-147
URL: http://jiaeee.com/article-1-920-en.html
University of Kurdistan
Abstract:   (532 Views)
Recently, environmental, economic and reliability oriented motivations facilitate cellular operation of smart power systems in the light of microgrid paradigm. Obviously, due to low inertia stack, high variety of generation units with various technical characteristics and different islanded and grid-connected operational modes, make the protection and control structures become new challenges. On the other hand, by integration of advanced metering and communication infrastructures in the microgrids, differential protection as the most reliable relaying logic, play a vital role in the protection structure of the microgrids. Owing to nature of occurring faults in the microgrids, high resistance faults have created a major problem in applying differential protection and directional fault. In this paper is used a new method for quick and accurate detection of fault in DC micro-grid, so that it detected internal fault from external fault, the performance of this new algorithm is also shown for increasing the fault resistance and compared with the conventional differential protection. The basis of new method is to use the Fault Component Current of the two sides of the study line and plot them on the  plan to identify the type of fault. In this paper simulation of internal and external fault in EMTP-ATP for different values of fault resistance is done and the implementation of the new algorithm and conventional differential protection is done in MATLAB. The simulation results indicate the accuracy and high speed of the operation of the new expressed method.
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Type of Article: Research | Subject: Power
Received: 2019/06/10 | Accepted: 2020/02/5 | Published: 2022/04/14

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