A New Digital Twins-Based Overcurrent Protection Scheme for Distributed Energy Resources Integrated Distribution Networks

Self Cite

This article introduces a new approach for validating directional overcurrent protection schemes in ring-topology electrical distribution systems with distributed energy resources (DERs). The proposed protection scheme incorporates overcurrent and directional functions and addresses DER-induced challenges such as variable short circuit levels. This study employs real-time and offline simulations to evaluate the performance of the protection coordination scheme using a digital twin under DER-supplied loads. The utilization of digital twins offers the possibility to simulate different scenarios, providing real-time responses to dynamic changes and allowing for informed decision-making in response to disturbances or faults. This study aims to present a new approach to validate the performance of the proposed protection scheme when the load is entirely supplied by DERs, highlighting issues such as false trips and protection system blindness resulting from changes in short circuit currents. The results show a breakdown in the coordination of the protection scheme during the fault conditions, demonstrating the effectiveness of digital twins in validating the protection scheme’s performance. Performing an analysis in the electromagnetic transient (EMT) domain improves the validation and refines the results.

Section: Application Of Digital Twins In Power Gridsmentioning

confidence: 99%

New Approach for Validation of a Directional Overcurrent Protection Scheme in a Ring Distribution Network with Integration of Distributed Energy Resources Using Digital Twins

Gómez-Luna,

De La Cruz,

Vasquez

2024

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“…The integration of distributed energy resources (DERs)-including photovoltaic panels (PVs), small-scale wind turbines, batteries for energy storage, and biomass generators-into electricity distribution networks is important for advancing renewable energy adoption and enhancing grid resilience. Positioned close to the consumption points, these resources offer significant economic and environmental benefits, particularly PVs, known for their efficiency and sustainability advantages [1]. Despite the potential, the intermittent nature of DERs poses unique challenges to energy system operators, such as managing the unpredictability of energy output influenced by weather conditions for solar generation [2].…”

Section: Introductionmentioning

confidence: 99%

“…This variability can lead to faster frequency deviations, risking statutory frequency limits and introducing operational complexities, thereby necessitating advanced coordination and real-time data visibility [3]. Furthermore, the integration of DERs into distribution networks prompts a re-evaluation of grid measures to accommodate the nuances introduced by these technologies [1].…”

Section: Introductionmentioning

confidence: 99%

A Digital Twin Framework for Simulating Distributed Energy Resources in Distribution Grids

Værbak,

Billanes,

Jørgensen

et al. 2024

As the adoption of distributed energy resources (DERs) grows, the future of electricity distribution systems is confronted with significant challenges. These challenges arise from the transformation of consumers into prosumers and the resulting increased system complexity, leading to more pressure on the distribution grids. To address this complexity, a Digital Twin framework is designed to simulate DERs within distribution grids effectively. This framework is structured around four key modules: DERs, the electricity distribution grid, the energy management system, and the consumers. It incorporates a communication interface to facilitate interactions among these modules and includes considerations for grid topologies and demand-side configurations. The framework allows for the exploration of various DER adoption rates and capacities. The validation of this framework involves case studies on two Danish distribution grids with scenarios incorporating rooftop photovoltaic (PV) systems, batteries, and electric vehicles, considering different combinations of these technologies. The findings demonstrate the framework’s ability to depict the states of the grid, PV systems, electric vehicles, and battery systems with a 10 min resolution over periods ranging from a day to over a decade.

“…Also, the higher cost of transmission and distribution losses motivates system planners to use these alternatives as distributed generation units (DGs) in electrical distribution networks. The complication of protective device coordination in interconnected power subtransmission systems and deregulated distribution systems is intensively increasing due to continuous changes in the interconnected systems' topology [2]. These changes result from sustained load growth and the corresponding installation of distributed generation units (DGs).…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] is greater than that of relay R 15-16 by a difference equal to or greater than CTI. Simultaneously, the t op of backward relay R 17-16 is greater than that of relay R 16-15 by a difference equal to or greater than CTI, as shown in Table16.•With section 1-2 disconnected, BC connected, and DGs connected, the t op of relay R 1-15 is greater than that of relay R 15-16 by a difference equal to or greater than CTI.…”

mentioning

confidence: 99%

Communicationless Overcurrent Relays Coordination for Active Distribution Network Considering Fault Repairing Periods

Elsadd,

Zobaa,

Khattab

et al. 2023

This paper presents an integrated overcurrent relays coordination approach for an Egyptian electric power distribution system. The protection scheme suits all network topologies, including adding distribution generation units (DGs) and creating new paths during fault repair periods. The optimal types, sizes, and locations of DGs are obtained using HOMER software (Homer Pro 3.10.3) and a genetic algorithm (GA). The obtained values align with minimizing energy costs and environmental pollution. The proposed approach maintains dependability and security under all configurations using a single optimum setting for each relay. The calculations consider probable operating conditions, including DGs and fault repair periods. The enhanced coordination procedure partitions the ring into four parts and divides the process into four paths. The worst condition of two cascaded overcurrent relays from the DGs’ presence viewpoint is generalized for future work. Moreover, a novel concept addresses the issue of insensitivity during fault repair periods. The performance is validated through the simulation of an Egyptian primary distribution network.