Interharmonic Differential Relay With a Soft Current Limiter for the Protection of Inverter-Based Islanded Microgrids

El-Sayed, Wael T.; El-Saadany, Ehab F.; Zeineldin, H. H.

doi:10.1109/tpwrd.2020.3006791

Cited by 23 publications

(16 citation statements)

References 28 publications

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“…Varios autores [6], [7], [8] destacan qué, para implementar una estrategia de protección, es necesario considerar los efectos de corriente de cortocircuito que tienen los distintos generadores, dependiendo del estado de operación del sistema (conectado a la red como modo o modo isla).…”

Section: Protecciones En Una Microrredunclassified

Análisis de Protecciones Eléctricas de Microgrids Modo Isla con Elevada Penetración de Energías Renovables No Convencionales.

Santiana

2022

INGENIO

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La integración de la generación distribuida en microrredes ofrece una alternativa renovable a la generación convencional con una calidad de energía mejorada y pérdidas de energía reducidas. Sin embargo, las microrredes también plantean nuevos retos tecnológicos como la coordinación de medidas de protección eléctrica ante corrientes de cortocircuito y fluctuaciones en el flujo de energía bidireccional. Esta investigación mide las condiciones de operación de la carga y generación para determinar los mejores ajustes y protección contra sobre corriente para microrredes. Se desarrollaron simulaciones para cuatro casos diferentes: barra del generador sincrónico, barra de generación eólica y barra del generador solar 1 y 2, se provocó fallas trifásicas separadas en cada barra a la que estaba conectado cada generador, obteniendo así la curva de funcionamiento de cada relé y el proceso de desconexión de dicha barra.

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Section: Protecciones En Una Microrredunclassified

Análisis de Protecciones Eléctricas de Microgrids Modo Isla con Elevada Penetración de Energías Renovables No Convencionales.

Santiana

2022

INGENIO

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“…Recently, some scholars propose solutions by modifying the converter control and the protection relay. Reference [131] proposes a soft current limiting control to generate the inter-harmonic current, which can be detected by a designed inter-harmonic differential relay to identify the AC line faults. In [132], through modifying control to inject synthetic harmonic current during AC faults, the relay can measure the harmonic current to identify the fault location.…”

Section: B Ac Fault Protection In Gfm Converters Interfaced Gridmentioning

confidence: 99%

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Zhang

Xiang

Lin

et al. 2021

Journal of Modern Power Systems and Clean Energy

147

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The renewable energy sources (RESs) dominated power grid is an envisaged infrastructure of the future power system, where the commonly used grid following (GFL) control for grid-tied converters suffers from lacking grid support capability, low stability, etc. Recently, emerging grid forming (GFM) control methods have been proposed to improve the dynamic performance and stability of grid-tied converters. This paper reviews existing GFM control methods for the grid-tied converters and compares them in terms of control structure, grid support capability, fault current limiting, and stability. Considering the impact of fault current limiting strategies, a comprehensive transient stability analysis is provided. In addition, this paper explores the typical applications of GFM converters, such as AC microgrid and offshore wind farm high-voltage direct current (OWF-HVDC) integration systems. Finally, the challenges to the GFM converters in future applications are discussed.

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“…, = 1, , −1 = 0 ∀ ∈ Ω 0 (26) where , and , −1 are binary variables denote the status of line in the post-switching and pre-switching networks, respectively. In the above formulation, , and , −1 are treated as input parameters given to the problem.…”

Section: A Optimal Transitional Droops For a Single Line-closingmentioning

confidence: 99%

“…Later, in subsection IV.C, the binary status of the line will be treated as a decision variable, when optimizing the execution sequence of switching operations. In addition, the set Ω 0 , in (26), is a singleton that specifies the line affected by the line-closing operation. Equations ( 12) and ( 13) are active and reactive power balance constraints.…”

Section: A Optimal Transitional Droops For a Single Line-closingmentioning

confidence: 99%

Dynamic Transitional Droops for Seamless Line-Switching in Islanded Microgrids

El-Sayed

Farag

Zeineldin

et al. 2021

IEEE Trans. Power Syst.

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Line-switching operations introduce several concerns to microgrid operators since they trigger reliability and power quality issues in addition to increasing the wear and tear cost of switching devices. This paper proposes a novel methodology for achieving seamless line-switching in low-inertia islanded microgrids. The proposed methodology aims at mitigating the detrimental line-switching impacts by minimizing the power flow in the switched lines at the moments of executing the switching operations. The minimization of the power flow is realized by optimizing the droop control parameters of the DGs during the transition from one network topology to another. Besides, during executing a series of line-switching operations, the sequence of switching is also optimized to minimize the total switched power. While optimizing the line-switching execution sequence, the transitional droops are optimized for each line-switching operation within that sequence. A dynamic mixed-integer nonlinear programming problem is formulated to find both the optimized dynamic transitional droops and line-switching sequence simultaneously. Simulation results demonstrate the effectiveness of the proposed seamless line-switching methodology where the switched power can be reduced by more than 80% for a single line-switching operation and 54% considering a series of four switch exchanges in addition to achieving several instances of zero-current switching. As a result, a significant decrease in the peak of voltage transients has been recorded for some cases.

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Interharmonic Differential Relay With a Soft Current Limiter for the Protection of Inverter-Based Islanded Microgrids

Cited by 23 publications

References 28 publications

Análisis de Protecciones Eléctricas de Microgrids Modo Isla con Elevada Penetración de Energías Renovables No Convencionales.

Análisis de Protecciones Eléctricas de Microgrids Modo Isla con Elevada Penetración de Energías Renovables No Convencionales.

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Dynamic Transitional Droops for Seamless Line-Switching in Islanded Microgrids

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