A Direct Phase-coordinates Approach to Fault Ride Through of Unbalanced Faults in Large-scale Photovoltaic Power Systems

Kou, Wei; Wei, Debing; Zhang, Peng; Xiao, Weidong

doi:10.1080/15325008.2015.1014580

Cited by 26 publications

(12 citation statements)

References 15 publications

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“…where I dpv-r & I qpv-r are the references for the active and reactive current. Which can be calculated as given in [13].…”

Section: Configuration and Control Of The Pv Unitmentioning

confidence: 99%

“…The basic coordination principles of the control switching under various operating conditions are given as: The balanced power of the microgrid in the normal condition is P PV1 +P PV2 +P SMES =P load1 +P load2 +P ex (13) where P ex is the power exchange between microgrid and main network. The power loss is neglected, since the active SFCL has low impedance.…”

Section: The Basic Principles For the Coordination Of The Smes Anmentioning

confidence: 99%

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Microgrid Stability Enhancement by using Coordination of SFCL, SMES and Distributed Generation Units with Fuzzy Logic Controller

Ayesha¹,

Gowd²,

Lakshmi³

2019

IJRTE

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By the coordination of the superconducting fault current limiter (SFCL), superconducting magnetic energy storage (SMES) and distributed generation (DG) units, the stability of the microgrid is increased under short circuit fault conditions. And by this coordination control, the microgrid is smoothly separated from the main network under severe fault and attains a fault ride through (FRT) operation under minor fault. In this paper, to overcome the drawbacks of the PI controller a fuzzy logic controller (FLC) is used in the controller of the SFCL. This proposed method is carried out in a MATLAB/Simulink. The results show the achievement of a better control strategy.

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“…where I dpv-r & I qpv-r are the references for the active and reactive current. Which can be calculated as given in [13].…”

Section: Configuration and Control Of The Pv Unitmentioning

confidence: 99%

Section: The Basic Principles For the Coordination Of The Smes Anmentioning

confidence: 99%

Microgrid Stability Enhancement by using Coordination of SFCL, SMES and Distributed Generation Units with Fuzzy Logic Controller

Ayesha¹,

Gowd²,

Lakshmi³

2019

IJRTE

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“…In order to make the development of grid-connected PV systems a successful business opportunity, it is necessary to improve the cost, efficiency and life expectancy of the power digital interface [4]. Whenever there is a fault on the grid side, the DC voltages at inverter change abruptly; consequently, traditional MPPT techniques can't handle the sudden change in voltage, resulting in voltage sag [10] at the inverter and the production of harmonic at the AC side. Based on the symmetrical components, a protection scheme is implemented [11] to deal with the LVRT problem but has the failure of the high current pressure on the low grid and unbalanced voltage.…”

Section: Introductionmentioning

confidence: 99%

“…The currentsource-inverter (CSI) provides benefits over voltage-sourceinverter (VSI) in terms of intrinsic boosting and short-circuit protection capability, direct current output regulation and simplified ac-side filter design. Distributed generation (DG) systems are usually based on power electronic converters that produce harmonics, and by using passive filtering switching harmonics need to be minimized by using LCL filter [5][6][7][8][9][10][11][12][13]. Model-Predictive Control (MPC) for single-phase PV inverters has been proposed for the LVRT operation.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Dynamic Performance using the Grid-Tied Photovoltaic (PV) System with Nonlinear Controller

Nangyal¹

2019

IJEW

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Grid connected Photovoltaic (PV) system installations are rapidly growing around the globe to meet the increasing demand of electricity, this results in a high penetration to the electrical grid. A great deal of effort should be made to ensure the functionality of the PV system at the optimal level. Due to its non-linear nature, PV system can't handle electrical faults, which may lead to voltage sag at DC side while simultaneously generating dynamics at AC side. This work offers techniques for improving the dynamic performance of the PV system by controlling voltage sag through the application of fuzzy logic (FLC) based maximum power point techniques (MPPT) at DC-DC boost converter and the regulation of dynamics at inverter by using positive and negative sequence current controlling techniques at the time of grid faults. In the event a fault occurs, fuzzy logic based MPPT controller will be activated, instead of the simple MPPT techniques to maintain constant DC voltages. Such methods are applied by designing a MATLAB / SIMULINK 1-MW PV system and validating the tests by adding faults in the system.

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“…Meanwhile, the DC/DC converter proceeds to transmit the PV array's maximum output power into the DC-link. Owing to the power imbalance between PPV and Pgf, the DC-link capacitance voltage will be forced to increase sharply [38], and it can be calculated as:…”

Section: Fault Characteristic Of the Pv Generationmentioning

confidence: 99%

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

Chen

et al. 2016

Energies

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Abstract:Concerning the development of a micro-grid integrated with multiple intermittent renewable energy resources, one of the main issues is related to the improvement of its robustness against short-circuit faults. In a sense, the superconducting fault current limiter (SFCL) can be regarded as a feasible approach to enhance the transient performance of a micro-grid under fault conditions. In this paper, the fault transient analysis of a micro-grid, including distributed generation, energy storage and power loads, is conducted, and regarding the application of one or more flux-coupling-type SFCLs in the micro-grid, an integrated technical evaluation method considering current-limiting performance, bus voltage stability and device cost is proposed. In order to assess the performance of the SFCLs and verify the effectiveness of the evaluation method, different fault cases of a 10-kV micro-grid with photovoltaic (PV), wind generator and energy storage are simulated in the MATLAB software. The results show that, the efficient use of the SFCLs for the micro-grid can contribute to reducing the fault current, improving the voltage sags and suppressing the frequency fluctuations. Moreover, there will be a compromise design to fully take advantage of the SFCL parameters, and thus, the transient performance of the micro-grid can be guaranteed.

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A Direct Phase-coordinates Approach to Fault Ride Through of Unbalanced Faults in Large-scale Photovoltaic Power Systems

Cited by 26 publications

References 15 publications

Microgrid Stability Enhancement by using Coordination of SFCL, SMES and Distributed Generation Units with Fuzzy Logic Controller

Microgrid Stability Enhancement by using Coordination of SFCL, SMES and Distributed Generation Units with Fuzzy Logic Controller

Improvement of Dynamic Performance using the Grid-Tied Photovoltaic (PV) System with Nonlinear Controller

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

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