A New Communication-Free Dual Setting Protection Coordination of Microgrid

Beder, Heba; Mohandes, Baraa; Moursi, Mohamed Shawky El; Badran, Ebrahim A.; Saadawi, Magdi M. El

doi:10.1109/tpwrd.2020.3041753

Cited by 35 publications

(16 citation statements)

References 23 publications

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“…A novel protection scheme for dual-setting DOCRs in MGs with DGs has been introduced in ref. [12]. This scheme uses a dual-protection setting in the main and backup operation topologies in one relay.…”

Section: Literature Reviewmentioning

confidence: 99%

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Abeid

Alasali

et al. 2022

Energies

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The coordination of optimal overcurrent relays (OCRs) for modern power networks is nowadays one of the critical concerns due to the increase in the use of renewable energy sources. Modern grids connected to inverter-based distributed generations (IDGs) and synchronous distributed generations (SDGs) have a direct impact on fault currents and locations and then on the protection system. In this paper, a new optimal OCR coordination scheme has been developed based on the nonstandard time–current characteristics (NSTCC) approach. The proposed scheme can effectively minimize the impact of distributed generations (DGs) on OCR coordination by using two optimization techniques: genetic algorithm (GA) and hybrid gravitational search algorithm–sequential quadratic programming (GSA–SQP) algorithm. In addition, the proposed optimal OCR coordination scheme has successfully employed a new constraint reduction method for eliminating the considerable number of constraints in the coordination and tripping time formula by using only one variable dynamic coefficient. The proposed protection scheme has been applied in IEEE 9-bus and IEC MG systems as benchmark radial networks as well as IEEE 30-bus systems as meshed structures. The results of the proposed optimal OCR coordination scheme have been compared to standard and nonstandard characteristics reported in the literature. The results showed a significant improvement in terms of the protection system sensitivity and reliability by minimizing the operating time (OT) of OCRs and demonstrating the effectiveness of the proposed method throughout minimum and maximum fault modes.

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Section: Literature Reviewmentioning

confidence: 99%

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Abeid

Alasali

et al. 2022

Energies

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“…t ij is the operating time of relay i when a fault is happened in location j. A and B are relay's tripping curve coefficients, whose values are 0.14 and 0.02, respectively, [43]. In addition, the expressed objective function should fulfill the following constraint in both of the grid connected and islanded modes.…”

Section: Docr Principle and Settingmentioning

confidence: 99%

“…where CTI stands for the minimum coordination time interval required for discriminating between pm and bk for the same fault in j, recommended to be CTI ∈ [0.2-0.5] in most of the contexts, as [43]. In the same way, for the pickup setting and TDS of DOCRs, following constraints should be considered.…”

Section: Docr Principle and Settingmentioning

confidence: 99%

AC Microgrids Protection: A Digital Coordinated Adaptive Scheme

et al. 2021

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A significant challenge for designing a coordinated and effective protection architecture of a microgrid (MG) is the aim of an efficient, reliable, and fast protection scheme for both the grid-connected and islanded modes of operation. To this end, bidirectional power flow, varying short-circuit power, low voltage ride-through (LVRT) capability, and the plug-and-play characteristics of distributed generation units (DGUs), which are key issues in a MG system must be considered; otherwise, a mal-operation of protection devices (PDs) may occur. In this sense, a conventional protection system with a single threshold/setting may not be able to fully protect an MG system. To tackle this challenge, this work presents a comprehensive coordinated adaptive protection scheme for AC MGs that can tune their protection setting according to the system states and the operation mode, and is able to switch the PDs’ setting. In the first step of the proposed adaptive algorithm, an offline setting will be adopted for selective and sensitive fault detection, isolation, and coordination among proposed protective modules. As any change in the system is detected by the proposed algorithm in the online step, a new set of setting for proposed modules will be performed to adapt the settings accordingly. In this way, a new set of settings are adapted to maintain a fast and reliable operation, which covers selective, sensitive, and adaptive requirements. The pickup current (Ip) and time multiple settings (TMS) of directional over-current relays (DOCR), as well as coordinated time delays for the proposed protection scheme for both of the grid-connected and islanded modes of operation, are calculated offline. Then, an online adaptive protection scheme is proposed to detect different fault types in different locations. The simulation results show that the proposed method provides a coordinated reliable solution, which can detect and isolate fault conditions in a fast, selective and coordinated adaptive pattern.

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“…The available techniques in the literature for keeping the relays coordinated in both grid and islanded modes can be classified into local and communication based approaches. The schemes of the first category do not need communications [5]- [10]. In [5], due to the difference in fault magnitudes for grid-connected and islanded operation, fault current limiters (FCLs) are positioned and traditional DOCRs are optimally coordinated considering both microgrid modes of operation.…”

Section: Introductionmentioning

confidence: 99%

“…When the fault conditions change, the protection relays cannot achieve the selectivity criteria since the fault location is based on constant threshold values. Another recent scheme for microgrid protection is introduced in [10] depending on dual protection settings for DOCRs. The first setting of TDS for primary protection is based on the very inverse curve while the second setting for backup protection is based on the normal inverse curve.…”

Section: Introductionmentioning

confidence: 99%