Online Coordination of Directional Overcurrent Relays with Presence of Distributed Generation in Smart Grids

Yen Shih, Meng (2016) Online Coordination of Directional Overcurrent Relays with Presence of Distributed Generation in Smart Grids. Doctorado thesis, Universidad Autónoma de Nuevo León.

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The overcurrent protection principle is the most widely implemented in electrical networks. However, with the constant network upgrading aiming for optimal operation and cost (smart grid), distributed generations (DGs) as well as other elements have been integrated on to the network. The integration of DGs can cause degradation of overcurrent relay performance, which the worst case scenario is the loss of coordination between overcurrent relays. Therefore, in this work, the algorithmic architecture of adaptive protection scheme (APS) has been proposed and developed to mitigate the impacts of DGs connected on smart grid and enhance overall sensitivity of directional overcurrent relays (DOCRs). The proposed scheme consists of two stages: the first stage is responsible to execute the adaptive function which performs data transfer to and from the system, and a real time algorithm that execute the monitoring function and calculate input data for the second stage. The second stage consists of an optimization algorithm which is responsible to optimize the input data provided by stage one and coordinate the DOCRs. Studies have been carried out for different network topologies and load demands implementing APS. This shows the notable difference between the conventional coordination approach and the proposed on-line coordination approach. Then DGs are included in the analysis, such that the impacts of DG prior and after the application of APS are presented and a new mitigation scheme is proposed. The coordination loss and overreach effects due to DG penetration are clearly identified and the mitigation has been carried out successfully. Also, comparisons among different versions of differential evolution algorithm (DE) for coordination of DOCRs in bigger and interconnected power systems are presented. The evaluation criteria consist of fitness value, number of violation and standard deviation. The outstanding DE algorithm has been enhanced in four aspects (dial reduction scheme, elitism and mediocrity scheme, mutation index renew scheme, and population reduction scheme) for even more complex DOCR coordination problem. The enhanced DE shown best result (in terms of execution time, result quality, robustness and convergence ability) compared to all others in the IEEE 14 and 57 bus systems. The comparisons are based on 50 simulation runs of each algorithm.

Tipo de elemento: Tesis (Doctorado)
Información adicional: Doctor degree in electrical engineering
Materias: T Tecnología > TK Ingeniería Eléctrica, Electrónica, Ingeniería Nuclear
Divisiones: Ingeniería Mecánica y Eléctrica
Usuario depositante: Editor Repositorio
Fecha del depósito: 06 Mayo 2019 22:13
Última modificación: 22 Nov 2019 17:25

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