Modeling and Control of &lt;formula formulatype="inline"&gt; &lt;tex Notation="TeX"&gt;$N$&lt;/tex&gt; &lt;/formula&gt;-Paralleled Grid-Connected Inverters With LCL Filter Coupled Due to Grid Impedance in PV Plants

Agorreta, Jackeline; Borrega, M.; López, Jesús; Marroyo, Luis

doi:10.1109/tpel.2010.2095429

Cited by 540 publications

(338 citation statements)

References 32 publications

(77 reference statements)

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“…The equal weights imply that there is no preferences between either of the STC or the NOCT conditions, however, if there is such a preference the affine weights can be unbalanced. Particularly, applying either of the values of [1,0] or [0, 1] convert Eq. (12) to a single (only Eq.…”

Section: Methodsmentioning

confidence: 99%

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An accurate method for the PV model identification based on a genetic algorithm and the interior-point method

2014

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Citation: Dizqah, Arash, Maheri, Alireza and Busawon, Krishna (2014) Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) An Accurate Method for the PV Model Identification Based on a GeneticAlgorithm and the Interior-Point Method AbstractDue to the PV module simulation requirements as well as recent applications of model-based controllers, the accurate photovoltaic (PV) model identification method is becoming essential to reduce the PV power losses effectively. The classical PV model identification methods use the manufacturers provided maximum power point (MPP) at the standard test condition (STC). However, the nominal operating cell temperature (NOCT) is the more practical condition and it is shown that the extracted model is not well suited to it. The proposed method in this paper estimates an accurate equivalent electrical circuit for the PV modules using both the STC and NOCT information provided by the manufacturers. A multi-objective global optimization problem is formulated using only the main equation of the PV module at these two conditions that restrains the errors due to employing the experimental temperature coefficients. A novel combination of a genetic algorithm (GA) and the interior-point method (IPM) allows the proposed method to be fast and accurate regardless the PV technology. It is shown that the overall error, which is defined by the sum of the MPP errors of both the STC and the NOCT conditions, is improved by a factor between 5.1% to 31% depending on the PV technology.

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Section: Methodsmentioning

confidence: 99%

“…The PV modules are nonlinear and complex still very popular components [1], [2] since they are easy to install and operate. However, it is essential to model the PV module accurately to be able to predict its behavior at different operating conditions.…”

Section: Introductionmentioning

confidence: 99%

An accurate method for the PV model identification based on a genetic algorithm and the interior-point method

2014

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“…In the s-domain, the sampling switch can be modeled as 1/T sp [24]. The modulator can be modeled by zero-order holder (ZOH) [25], which can be expressed as:…”

Section: Pi Controller Designmentioning

confidence: 99%

“…However, if K cf is too large, the system becomes unstable again. Figure 12 shows the Bode plot with different K cf which is obtained from Equation (24). In the magnitude-frequency characteristic, K cf hardly influences the low-frequency characteristic.…”

Section: Capacitor Current Feedback Designmentioning

confidence: 99%

Digital Controller Design Based on Active Damping Method of Capacitor Current Feedback for Auxiliary Resonant Snubber Inverter with LC Filter

et al. 2016

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Abstract:In some high-performance applications, an LC filter must be added to the auxiliary resonant snubber inverter (ARSI) to reduce the output current ripple. However, resonance occurs due to the additional LC filter, which makes the traditional closed-loop control not suitable to be used directly. Therefore, this paper presents a double-loop digital control based on the active damping method of capacitor current feedback to stabilize the system. Most of the studies on active damping methods are focused on the grid in consideration of zero resistance. However, the load resistance should not be neglected in the drive system. Therefore, the load resistance and digital control delays are considered in this paper. Moreover, an improved loading method is proposed to improve the duty ratio range. In order to verify the effectiveness of the controller, a prototype was developed. The simulation and experimental results demonstrate that soft-switching can be realized for the entire load range. The maximum duty ratio is improved by 0.01 by using the proposed loading method. The resonance can be eliminated by using the proposed control method.

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“…The three-phase voltage source converter (VSC) [1][2][3] has widespread applications, including active power filters, unified power flow control, high voltage direct current transmission, and power transmission for solar, wind, and other renewable energies. It can be also foreseen that the VSC could become the main connection device of future smart grid technologies, such as in grid energy storage, flexible power transmission, renewable energy generation, controllable loads, etc.…”

Section: Introductionmentioning

confidence: 99%

Small signal analysis for DC bus voltage disturbance resistance of voltage source converter

Wang¹,

Wu²,

Lu³

et al. 2016

Turk J Elec Eng & Comp Sci

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Abstract:The DC bus voltage of the voltage source converter (VSC) is prone to large fluctuation and even to losing its stability for the large mutation of grid voltage or DC-link loads. First the characteristics of two-step transmission to power in the VSC are analyzed, proving that it is inevitable for DC bus voltage fluctuation to occur when grid voltage or DC-link loads mutate. A new two-step feedforward control strategy is then put forward for curbing the fluctuation, which overcomes the shortcoming by which the traditional feedforward control strategy is affected for the performance of current control. The small signal models of nonfeedforward control, traditional feedforward control, and two-step feedforward control are established respectively for comparing their performance. It is certified that the two-step feedforward control maximizes the stability of the bus voltage without affecting current control. Finally, the experimental results verify the correctness of the new strategy and the theoretical analysis.

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Modeling and Control of <formula formulatype="inline"> <tex Notation="TeX">$N$</tex> </formula>-Paralleled Grid-Connected Inverters With LCL Filter Coupled Due to Grid Impedance in PV Plants

Cited by 540 publications

References 32 publications

An accurate method for the PV model identification based on a genetic algorithm and the interior-point method

An accurate method for the PV model identification based on a genetic algorithm and the interior-point method

Digital Controller Design Based on Active Damping Method of Capacitor Current Feedback for Auxiliary Resonant Snubber Inverter with LC Filter

Small signal analysis for DC bus voltage disturbance resistance of voltage source converter

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