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Fast Protection Scheme for Active Distribution Networks: Breaking Chains by Utilizing Auxiliary Relays

Journal of Modern Power Systems and Clean Energy 2020年第3期8卷 540-548页

作者： Amin Yazdaninejadi Daryoush Nazarpour vahid talavat Department of Electrical Engineering Shahid Rajaee Teacher Training UniversityTehranIran Urmia University UrmiaIran

Due to the swift expansion and the deployment of distributed generation, protection systems of active distribution networks are more expected to be fast. In loop-based active distribution networks, directional overcurrent relays(DOCRs) are caught in different chains. These chains stand as the severe obstacle to follow fast-response protection, which remains a significant challenge. In this paper, to overcome this challenge, a fast protection scheme is proposed to break the chains in the corresponding loops by deploying auxiliary DOCRs. The most effective constraint associated with each chain is relaxed during the coordination process. Then, the auxiliary relays are employed to play the backup roles instead of conventional backup relays in the relaxed constraints. To avoid the misoperation of relays in the proposed scheme, low bandwidth communication links are suitably employed. Furthermore, the auxiliary relays are optimally placed and adjusted. The proposed approach demonstrates a mixed-integer nonlinear programming model which is tackled by particle swarm optimization(PSO) algorithm. Detailed simulation studies are carried out to verify the performance of the proposed approach.

关键词： Fast protection scheme directional overcurrent relays active distribution network backup relay auxiliary relay

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A Risk-based Competitive Bi-level Framework for Operation of Active Distribution Networks with Networked Microgrids

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1121-1129页

作者： Himan Hamedi vahid talavat Ali Tofighi Reza Ghanizadeh Department of Electrical Engineering Urmia BranchIslamic Azad UniversityUrmiaIran Department of Electrical Engineering Urmia UniversityUrmiaIran Department of Electrical Engineering Pardis BranchIslamic Azad UniversityPardisIran

This paper presents a risk-based competitive bi-level framework for optimal decision-making in energy sales by a distribution company(DISCO)in an active distribution network(ADN).At the upper level of this framework,the DISCO and a rival retailer compete for selling *** DISCO intends to maximize its profit in the competitive ***,it is very important for the DISCO to make a decision and offer an optimal price for attracting customers and winning the *** microgrids(MGs)at the lower level,as the costumers,intend to purchase energy from less expensive sources in order to minimize *** is a bi-level framework with two different *** genetic algorithm is used to solve this *** DISCO needs to be cautious,so it uses the conditional value at risk(CVaR)to reduce the risk and increase the probability of making the desired *** effect of this index on the trade between the two levels is *** simulation results show that the proposed method can reduce the cost of MGs as the costumers,and can enable the DISCO as the seller to win the competition with its rivals.

关键词： Microgrid networked operation bi-level framework risk active distribution networks

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维普期刊数据库

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