Large scale PV systems under non-uniform and fault conditions

Vargas, Javier; Goss, Brian; Gottschalg, Ralph

doi:10.1016/j.solener.2015.03.041

Cited by 27 publications

(13 citation statements)

References 6 publications

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“…The fuse will isolate the faulty strings so that the rest of the PV system can continue to generate electricity. These fuses may also cause failures if they are not carefully chosen [3].…”

Section: Fuse Fuse Combinations Switch Disconnectors and Circuit Brmentioning

confidence: 99%

“…In LSPVSs, reliability is quite complex to carry out due to the variability associated with the system components, namely the PV modules, inverter(s) and other balance of systems (BOSs) components [3,4]. A major part of the existing literature focuses on the reliability assessment of specific components, such as the inverter [5], IGBT switches [6] and largely on the PV modules' individual elements (encapsulant, bypass diodes etc.)…”

Section: Introductionmentioning

confidence: 99%

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Impact of Component Reliability on Large Scale Photovoltaic Systems’ Performance

Baschel

Koubli

Roy³

et al. 2018

Energies

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In this work, the impact of component reliability on large scale photovoltaic (PV) systems' performance is demonstrated. The analysis is largely based on an extensive field-derived dataset of failure rates of operation ranging from three to five years, derived from different large-scale PV systems. Major system components, such as transformers, are also included, which are shown to have a significant impact on the overall energy lost due to failures. A Fault Tree Analysis (FTA) is used to estimate the impact on reliability and availability for two inverter configurations. A Failure Mode and Effects Analysis (FMEA) is employed to rank failures in different subsystems with regards to occurrence and severity. Estimation of energy losses (EL) is realised based on actual failure probabilities. It is found that the key contributions to reduced energy yield are the extended repair periods of the transformer and the inverter. The very small number of transformer issues (less than 1%) causes disproportionate EL due to the long lead times for a replacement device. Transformer and inverter issues account for about 2/3 of total EL in large scale PV systems (LSPVSs). An optimised monitoring strategy is proposed in order to reduce repair times for the transformer and its contribution to EL.

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“…The fuse will isolate the faulty strings so that the rest of the PV system can continue to generate electricity. These fuses may also cause failures if they are not carefully chosen [3].…”

Section: Fuse Fuse Combinations Switch Disconnectors and Circuit Brmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Component Reliability on Large Scale Photovoltaic Systems’ Performance

Baschel

Koubli

Roy³

et al. 2018

Energies

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“…Time-domain reflectometry (TDR) is employed for the time and position of faults in which input and the reflected signal from the PV module are compared. Failure position and type are defined by the signal delay and distortion in waveform shape [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnostic Methodologies for Utility-Scale Photovoltaic Power Plants: A State of the Art Review

et al. 2021

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The worldwide electricity supply network has recently experienced a huge rate of solar photovoltaic penetration. Grid-connected photovoltaic (PV) systems range from smaller custom built-in arrays to larger utility power plants. When the size and share of PV systems in the energy mix increases, the operational complexity and reliability of grid stability also increase. The growing concern about PV plants compared to traditional power plants is the dispersed existence of PV plants with millions of generators (PV panels) spread over kilometers, which increases the possibility of faults occurring and associated risk. As a result, a robust fault diagnosis and mitigation framework remain a key component of PV plants. Various fault monitoring and diagnostic systems are currently being used, defined by calculation of electrical parameters, extracted electrical parameters, artificial intelligence, and thermography. This article explores existing PV fault diagnostic systems in a detailed way and addresses their possible merits and demerits.

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“…The studies conducted in [1, 2] have investigated the validity of PV simulation models based on hardware experiments, where the experiment in [2] have utilised a simplified PV inverter circuit to build a 13‐stage inverter. The studies in [3–9] conducted studies on the effects and contributions introduced by PV system integration into the power system. The work done in [3–6] have studied the voltage‐rise problem caused by PV systems and the mitigation methods, including reactive power support and peak shaving with energy storage facilities.…”

Section: Introductionmentioning

confidence: 99%

“…The researches in [7, 8] present different types of PV inverters and their requirements for integration. The work in [9] studied the integration of PV‐system‐based hardware but concentrates on balanced operation and only fault ride‐through (FRT) capability in terms of fault conditions. Studies in [10, 11] have conducted investigations on non‐uniform conditions including unbalanced voltage sags and faults.…”

Section: Introductionmentioning

confidence: 99%