A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids

Jing, Liuming; Son, Dae-Hee; Kang, Sang-Hee; Nam, Soon-Ryul

doi:10.3390/en9060459

Cited by 12 publications

(12 citation statements)

References 37 publications

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“…Similar to the microgrid protection method in [30], the proposed protection method utilizes both unit and collector bus protection, as shown in Figure 4. The main difference between the microgrid and proposed protection methods is the identification of sections in fault.…”

Section: Proposed Protection Methods For Slg Faults In An Offshore Winmentioning

confidence: 99%

“…The collector bus protection will detect the faulted feeder from the angle difference between the zero-sequence voltage and the zero-sequence current. In the faulted feeder, the zero-sequence current will lag the zero-sequence voltage by 60 • to 90 • , whereas in a healthy feeder, the zero sequence current will lead the zero-sequence voltage by 90 • [30]. The collector bus protection method is shown in Figure 6.…”

Section: Proposed Protection Methods For Slg Faults In An Offshore Winmentioning

confidence: 99%

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Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines

et al. 2017

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This paper proposes a protection method for single line-to-ground (SLG) faults in an ungrounded offshore wind farm with fully-rated converter-based wind turbines. The proposed method uses the unsynchronized current phasors measured by unit protections installed at the connection point of the fully-rated converter (FRC)-based wind turbines (WTs). Each unit protection collects the unsynchronized current phasors from two adjacent nodes and synchronizes them by aligning the positive-sequence current to the same phase angle. The faulted section is identified by comparing the phase angles of the synchronized zero-sequence currents from adjacent nodes. Simulations of an ungrounded offshore wind farm with relay models were carried out using power system computer-aided design (PSCAD)/ electromagnetic transients including direct current (EMTDC).

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Section: Proposed Protection Methods For Slg Faults In An Offshore Winmentioning

confidence: 99%

Section: Proposed Protection Methods For Slg Faults In An Offshore Winmentioning

confidence: 99%

Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines

et al. 2017

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“…In the same time, the growing share of distributed generation (DG) units in distribution systems jeopardizes the ability of protection systems to operate in a coordinated manner [3]. In general, distribution systems are operated radially for the ease of protection even if they are able to be managed in a ring topology.…”

Section: Motivationmentioning

confidence: 99%

A Non-Standard Characteristic Based Protection Scheme for Distribution Networks

et al. 2018

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Abstract:The increasing number of distributed generation (DG) units in the distribution systems poses a challenge on protection systems in terms of coordination. In addition, the single characteristic based conventional protection causes an increase in the primary operation time of the relays due to the coordination between relay pairs. As a consequence, earlier studies investigated the utilization of non-standard characteristics and protection schemes in order to ease the insufficiencies of the standard approach. However, a commonly accepted protection approach that mitigates the effect of DG while providing lower primary operating time by levering the benefits of the non-standard protection strategy has not been developed so far. In order to overcome the aforementioned drawbacks of traditional protection, this paper firstly introduces a non-standard characteristic and then proffers an unconventional protection strategy, which utilizes a double characteristic.The suggested protection approach is tested on the IEEE 14 Bus distribution system including synchronous generator based DG connection. The results show that the proposed characteristic and protection scheme are able to provide a substantial decrease in the operation time of the relays while meeting the coordination requirements.

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“…The penetration of renewable energy sources (RESs) such as photovoltaics (PVs) and wind turbines (WTs) is steadily increasing due to enhanced price competitiveness and the requirement of sustainable energy mixes. However, intermittent power outputs of RESs are detrimental to frequency and voltage stabilities, particularly in a small power system: e.g., a microgrid possessing a low moment of inertia [1,2]. A microgrid is an integrated platform that consists of power generation units, energy storage systems (ESSs), and demand response (DR) resources, whose operations are managed in a localised manner.…”

Section: Introductionmentioning

confidence: 99%

“…Degradation of power quality and reliability due to the low inertia moment and constant-speed control scheme of diesel engines [2,5].…”

mentioning

confidence: 99%

Decentralised Active Power Control Strategy for Real-Time Power Balance in an Isolated Microgrid with an Energy Storage System and Diesel Generators

et al. 2019

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Remote microgrids with battery energy storage systems (BESSs), diesel generators, and renewable energy sources (RESs) have recently received significant attention because of their improved power quality and remarkable capability of continuous power supply to loads. In this paper, a new proportional control method is proposed using frequency-bus-signaling to achieve real-time power balance continuously under an abnormal condition of short-term power shortage in a remote microgrid. Specifically, in the proposed method, the frequency generated by the grid-forming BESS is used as a global signal and, based on the signal, a diesel generator is then controlled indirectly. The frequency is controlled to be proportional to the AC voltage deviation of the grid-forming BESS to detect sudden power shortages and share active power with other generators. Unlike a conventional constant-voltage constant-frequency (CVCF) control method, the proposed method can be widely applied to optimise the use of distributed energy resources (DERs), while maintaining microgrid voltages within an allowable range, particularly when active power balance cannot be achieved only using CVCF control. For case studies, a comprehensive model of an isolated microgrid is developed using real data. Simulation results are obtained using MATLAB/Simulink to verify the effectiveness of the proposed method in improving primary active power control in the microgrid.

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A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids

Cited by 12 publications

References 37 publications

Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines

Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines

A Non-Standard Characteristic Based Protection Scheme for Distribution Networks

Decentralised Active Power Control Strategy for Real-Time Power Balance in an Isolated Microgrid with an Energy Storage System and Diesel Generators

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