Modeling and analysis of EMI from DC input of photovoltaic systems

Prajapati, Manish

doi:10.32657/10220/48131

Cited by 3 publications

(4 citation statements)

References 64 publications

(106 reference statements)

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“…This article presented a full circuital model, described in Section 2, as well as the required model parameters, in order to facilitate accurate SPICE-based modelling of three different Schottky diodes under dynamic conditions. This model overcame the obvious limitations of previous studies involving simulations of large-signal transient surges in PV plants, where the bypass diodes were omitted or where their operation was overly simplified [13][14][15][16]22]. This model also overcame more subtle implementation-related limitations, such as the application of large-signal stimuli to small-signal models, by being constructed in such a way as to allow for the correct simulation of large-signal transients.…”

Section: Discussionmentioning

confidence: 99%

“…This is shown in Figure 9. This circuital small-signal model is used in many publications, such as [4,21,22], for the purposes of diode modelling under AC conditions. This model is valid for small-signal AC diode modelling only, as large signal stimuli would result in a shifting of the operating point (and the resulting rectification effects).…”

Section: The Ac Small-signal Sub-modelmentioning

confidence: 99%

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The Measurement and SPICE Modelling of Schottky Barrier Diodes Appropriate for Use as Bypass Diodes within Photovoltaic Modules

2022

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The modelling of surges within PV (photovoltaic) installations has been the subject of much research in recent years. However, accurate simulations cannot be performed unless each and every component within a PV installation is modelled in sufficient detail. The bypass diodes within a PV module are frequently omitted from such simulations. When included, they are often represented by oversimplified models. This article addresses this need by presenting SPICE (Simulation Program with Integrated Circuit Emphasis) models for three Schottky diodes, chosen due to their suitability for use as bypass diodes. These models are the combination of DC (direct current) large-signal and AC (alternating current) small-signal sub-models, which are integrated such that the resulting full circuital models allow for accurate simulations involving large-signal transient stimuli. Two types of experimental setups, one incorporating a DC current–voltage curve sweep, and the other involving VNA-based (vector network analyser) AC small-signal impedance measurements, allow for the acquisition of the necessary model parameters at multiple operating points. The AC small-signal measurements cover a wide bandwidth of 100 Hz to 50 MHz. Multiple configurations of the measurement setups are employed in order to achieve the required dynamic range and sensitivity.

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Section: Discussionmentioning

confidence: 99%

Section: The Ac Small-signal Sub-modelmentioning

confidence: 99%

The Measurement and SPICE Modelling of Schottky Barrier Diodes Appropriate for Use as Bypass Diodes within Photovoltaic Modules

2022

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“…For alternating current (AC) conditions, the model shown in Figure 3 is often referenced [8,21,22]. This model, referred to in this article as the small-signal AC sub-model (SSACSM), incorporates a parallel capacitance, C p , and a series inductance, L s , to model the PV cell response under dynamic conditions.…”

Section: Background Concept 2: Circuit Pv Modelling State-of-the-artmentioning

confidence: 99%

Measurement-Based Nonlinear SPICE-Compatible Photovoltaic Models for Simulating the Effects of Surges and Electromagnetic Interference within Installations

2022

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An emerging area of interest within photovoltaic (PV) centred research is the simulation of the propagation of electromagnetic interference (EMI) and surges within PV installations. An overarching constraint in all simulation-based research is the accuracy of the models employed. In general, for PV-focussed simulations, nonlinear models are utilised for direct current (DC) analyses, whilst linearised models are employed for analyses involving surges or conducted electromagnetic interference. For large-signal electromagnetic interference and surges, the following two problems arise: (1) the aforementioned linearisation is only valid for the small-signal case, and (2) as they are constructed using only DC measurements, traditional large-signal PV models are generally only valid for DC conditions. Therefore, neither of these approaches can properly represent real-world PV behaviour under dynamic conditions. To overcome this limitation, this article proposes a more suitable model, compatible with Simulation Program with Integrated Circuit Emphasis (SPICE), and which results from the combination of two sub-models: one for large-signal DC cases, and one for small-signal alternating current (AC) cases. Consequently, the combined model enables improved modelling of the effects of large-signal transient perturbations to be performed, as well as cases involving small-signal AC and large-signal DC perturbations. The model parameters are extracted using data from two different classes of measurement setups: the first utilised a vector network analyser (VNA) to produce small-signal AC impedance results (covering a frequency range between 1Hz and 50MHz), and the second produces DC current-voltage curves. Both classes of measurement setup consider the device under test at multiple operating points. Key results include: (1) an improved SPICE-compatible PV model which caters for large-signal transient simulations, as well as for small-signal AC and large-signal DC cases, (2) improvements in the modelling of reverse bias behaviour when compared to the standard SPICE diode implementation, (3) the correct implementation of a voltage-dependent total capacitance (suitable for large-signal simulations), (4) modelling parameters for both a small (10 W) and a large (310 W) PV module, (5) measurement results which de-embedded the parasitic effects of the test setups employed, and (6) above 1 MHz, the physical layouts of the cells within the PV modules begin to influence the observed impedances.

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“…1. An example of its application is [3], where it was used in the modelling of the electromagnetic interference (EMI) produced by the direct current (DC) input of photovoltaic systems.…”

Section: Introductionmentioning

confidence: 99%

Novel Frequency-Domain Hybrid Circuit-Computational Electromagnetic Modelling of Photovoltaic Module Impedances

Coetzer,

Wiid,

Rix

2023

Preprint

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<p>A novel circuit-computational electromagnetic (CEM) hybrid simulation methodology, which results in vast improvements in the accuracy of high-frequency photovoltaic (PV) modelling between 1 Hz and 50 MHz, is proposed. At low frequencies, the impedance of a PV module is dominated by the behaviour of the PV cells, while at high frequencies it is dominated by the layout of the inter-cell connections. The proposed methodology considers both the low and high-frequency behaviour of a PV module in a single simulation. Firstly, the impedances of two PV modules are carefully measured using two vector network analyser configurations. Secondly, literature-based models of PV modules are adapted to the proposed methodology. Thirdly, improved models of each PV module are introduced in four ascending levels of complexity. These improved models comprise additional novel aspects, including distributed cell layouts and implicit CEM-calculated self-inductances. Fourthly, a feature-selective method is used to compare the measured results with the literature-based and improved models. This analysis yielded comparable error reductions of up to a factor of 400 -- highlighting the value of the improved methodology and models. Penultimately, the required level of computational resources is introduced, and the trade-off between simulation time and accuracy is discussed. Finally, a review discussion is presented.</p>

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Modeling and analysis of EMI from DC input of photovoltaic systems

Cited by 3 publications

References 64 publications

The Measurement and SPICE Modelling of Schottky Barrier Diodes Appropriate for Use as Bypass Diodes within Photovoltaic Modules

The Measurement and SPICE Modelling of Schottky Barrier Diodes Appropriate for Use as Bypass Diodes within Photovoltaic Modules

Measurement-Based Nonlinear SPICE-Compatible Photovoltaic Models for Simulating the Effects of Surges and Electromagnetic Interference within Installations

Novel Frequency-Domain Hybrid Circuit-Computational Electromagnetic Modelling of Photovoltaic Module Impedances

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