scholarly journals Inter-trip links incorporated optimal protection coordination

2020 ◽  
Vol 10 (1) ◽  
pp. 72
Author(s):  
Ali Abbasi ◽  
Hossein Kazemi Karegar ◽  
Tohid Soleymani Aghdam
Keyword(s):  
Genetic Algorithm ◽  
Smart Grid ◽  
System Performance ◽  
Distribution Network ◽  
Communication Links ◽  
Overcurrent Relays ◽  
Optimal Coordination ◽  
Search Approach ◽  
Fault Clearance ◽  
Optimal Protection

Due to advances in smart grid, different communication links as delay, inter-trip and activation are used between relays to enhance the protection system performance. In this paper, the effect of inter-trip links on optimal coordination of directional overcurrent relays (DOCRs) is analytically investigated and modelled. Moreover, an index is proposed to find the optimum locations for inter-trip link installation to reach the minimal fault clearance times under the selectivity constraint. Then a method is proposed to determine the candidate locations of inter-trip links and the associated reduced operating times. An Exhaustive search approach is also used to validate the efficiency of the proposed method. The method is simulated and tested on distribution network of IEEE 33 bus using the Power Factory software and MATLAB optimization toolbox. Genetic algorithm is used as an optimization tool to find optimal settings of relays. The results indicate the capability of proposed method in optimal protection coordination with optimum inter-trips.

Optimal coordination of overcurrent relays with constraining communication links using DE–GA algorithm

2021 ◽  
Author(s):  
Mohammad Bakhshipour ◽  
Farhad Namdari ◽  
Sajad Samadinasab
Keyword(s):  
Ga Algorithm ◽  
Communication Links ◽  
Overcurrent Relays ◽  
Optimal Coordination

scholarly journals Security-Constrained Optimal Protection Coordination for Dual-Setting Digital Directional Overcurrent Relays in the Distribution Network Including Non-Renewable/Renewable Synchronous Distributed Generation

2021 ◽  
Author(s):  
Sasan Pirouzi ◽  
Hosein Hasan Shahi ◽  
Mohammad Reza Akbai Zadeh ◽  
Amirreza Naderipour ◽  
Zulkurnain Abdul-Malek
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Optimal Solution ◽  
Operation Time ◽  
Distribution Networks ◽  
Time Interval ◽  
Dial Setting ◽  
Overcurrent Relays ◽  
Overcurrent Relay ◽  
Optimal Protection

Abstract In this paper, the security-constrained optimal protection coordination (SCOPC) is introduced for dual setting digital directional overcurrent relay (DDOCR) in distribution network, which including renewable and non-renewable synchronous distributed generation (SDG). The SCOPC minimizes the total operation time of DDOCRs in primary and backup protection operating to achieve a fast protection coordination. Also, to improve the flexibility in DDOCRs setting, the allowable limits of A and B coefficients, pickup current (PC) and time dial setting (TDS) in both reverse and forward directions are considered as constraints. Another constraint is the Coordination Time interval (CTI). To consideration of the mentioned scheme security, the SCOPC mechanism considered the unavailability of DDOCRs due to their failure, so the stochastic method is used to modelling of this parameter. To calculate the fault current, network variables are proportional to the daily stochastic operation results of distribution network. Moreover, the proposed problem is implemented on the standard distribution networks, and then the optimal solution is obtained with hybrid algorithm of grey wolf optimization (GWO) and training and learning optimization (TLBO). The numerical results illustrate that the proposed algorithm is able to achieve a reliable and fast protection coordination that has a low standard deviation.

scholarly journals A Novel Protective Logic for Optimal Coordination of Overcurrent Relays

2015 ◽  
Vol 16 (3) ◽  
pp. 439
Author(s):  
Sajad Samadinasab ◽  
Farhad Namdari ◽  
Nader Shojaei
Keyword(s):  
Short Circuit ◽  
Dynamic Changes ◽  
Communication Links ◽  
Overcurrent Relays ◽  
Measurement Units ◽  
Optimal Coordination ◽  
Pmu Placement ◽  
Protective Relays ◽  
And Performance ◽  
Full Network

Usually coordination of overcurrent relays is done by taking into account the specific structure of the system which does not show the real state of the system. On the other hand, dynamic changes in network can occur due to short circuit conditions, the malfunctioning relays, development, operation and repairs on any part of the power system. Also the most of the new protective schemes are based on a communication channel, which cannot be guaranteed in practice. Therefore, solving the problem of relay coordination is extremely difficult in case of dynamic changes in the network structure and the absence of communication links between some relays. In this article, a novel protective logic based on phasor measurement units (PMUs) data is proposed for optimal coordination of overcurrent relays. In this method, by using the PMU measurements, phasor information can be obtained continuously at any node where PMUs are installed in the power grid. For this purpose, in the first the Optimal PMU placement is determined for full network observability. Then, the dynamic changes of network will be observe by using wide area measurements based on PMUs data. Finally this information is sent via communication links PMUs for the optimal coordination of overcurrent relays. The use of PMU for the coordination of overcurrent relays improve the decision making capability and performance of protective relays and help them to form a reliable and robust protection system. The proposed method is tested on IEEE 8-bus and 14-bus standard networks.

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