Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Langella, R.; Testa, A.; Meyer, Jan; Möller, Friedemann; Stiegler, Robert; Djokić, Saša Ž.

doi:10.1109/tim.2016.2554378

Cited by 123 publications

(48 citation statements)

References 13 publications

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“…Since it has been demonstrated that a PV inverter has an anomalous behavior when it operates in regions far from its rated values [33], the described methodology is applied considering the signals in a piecewise approach. Therefore, the design variables and the objective function are divided into four sections through a day.…”

Section: Piecewise Approach Of the Proposed Methodologymentioning

confidence: 99%

Genetic Algorithm Methodology for the Estimation of Generated Power and Harmonic Content in Photovoltaic Generation

et al. 2020

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Renewable generation sources like photovoltaic plants are weather dependent and it is hard to predict their behavior. This work proposes a methodology for obtaining a parameterized model that estimates the generated power in a photovoltaic generation system. The proposed methodology uses a genetic algorithm to obtain the mathematical model that best fits the behavior of the generated power through the day. Additionally, using the same methodology, a mathematical model is developed for harmonic distortion estimation that allows one to predict the produced power and its quality. Experimentation is performed using real signals from a photovoltaic system. Eight days from different seasons of the year are selected considering different irradiance conditions to assess the performance of the methodology under different environmental and electrical conditions. The proposed methodology is compared with an artificial neural network, with the results showing an improved performance when using the genetic algorithm methodology.

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Section: Piecewise Approach Of the Proposed Methodologymentioning

confidence: 99%

Genetic Algorithm Methodology for the Estimation of Generated Power and Harmonic Content in Photovoltaic Generation

et al. 2020

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“…A fully automated test-bed, with accuracies better than 5%, 2% and 1% for individual harmonic magnitudes higher than 50mA, 100mA and 200mA, respectively, is used for all tests [8]. It consisted of a 1MS/s acquisition system and a controllable three-phase power source with programmable voltage waveforms and source impedance values, allowing configuration of specific waveform-impedance combinations.…”

Section: B Test Set-up and Test Parametersmentioning

confidence: 99%

“…This is of particular importance for the analysis of modern PE devices, for which LF harmonics might not be the most significant part of the total waveform distortion (e.g. [8]). The analysis of measurements is supported by the development of componentbased (circuit-based) models, capable of correctly reproducing the harmonic characteristics over the entire operating range.This paper shows that mostof tested PE devices exhibit distinctive power-dependent performance changes.…”

mentioning

confidence: 99%

Analysis and Modelling of Power-Dependent Harmonic Characteristics of Modern PE Devices in LV Networks

Collin

Djokić

et al. 2017

IEEE Trans. Power Delivery

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This paper presents results of experimental and analytical evaluation of power-dependent harmonic emission of three common types of modern low voltage (LV) power electronic (PE) devices. After a detailed analysis of comprehensive test results, based on both existing and new waveform distortion indices, the development of component-based models of PE devices is discussed. The paper demonstrates the importance of including PE devices' controls for accurate modelling of their characteristics over the entire range of operating powers. Most of the analysed PE devices exhibit strong power-dependent changes of characteristics, additionally influenced by supply voltage conditions, which are important for the analysis of both existing networks and future "smart grids". ).testing of EVBCs, despite the fact that the power during the charging cycle is variable, and will typically reduce during the latter stages. Test procedures for power-generating LV PE devices do consider variable power operation, with [3] and [5] specifying test points at 100% and 50% (and 25% in [3]) of P rated for PVIs. However, the actual output of any PVI can be, and often is lower, dependent on ambient conditions. Across the operating range, the performance of the internal control circuits of a PE device may be compromised, altering the device's characteristics. This may have a negative impact on the supply grid when such equipment is connected in large numbers. This paper presents a detailed experimental-based characterization of a number of SMPS', EVBCs and PVIs across their entire operational ranges and for different supply conditions. Two new indices are introduced for the analysis, which allow separate assessment of the contributions from the low-frequency (LF) harmonics and all other waveform distortions to the device's total operating current. This is of particular importance for the analysis of modern PE devices, for which LF harmonics might not be the most significant part of the total waveform distortion (e.g. [8]). The analysis of measurements is supported by the development of componentbased (circuit-based) models, capable of correctly reproducing the harmonic characteristics over the entire operating range.This paper shows that mostof tested PE devices exhibit distinctive power-dependent performance changes. The impact of realistic supply voltage conditions, i.e. distorted voltage and source impedance, on device characteristics is also considered and is shown to have considerable impact on certain types of equipment. Particular attention is given to the increased distortion in low and very low power operating modes (defined as below 30% and 10% of P rated ), as this issue has received limited attention in literature and is not fully captured by existing indices. When operating in very low power mode, some of the measured PE devices enter unstable operating regions or disconnect (i.e. 'trip' via their internal protection). These effects signify the importance of PE devices' controls when evaluating and modelling power-dependent changes in...

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“…In practice, the equivalent model can be established by using the scanning method with a real hardware devices [14] - [16] or with the detailed EMT simulation models. The latter is applicable especially with the high-power, high-voltage devices due to more demanding requirements for the testing equipment.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Emissions of Power Electronic Devices Under Different Transmission Network Operating Conditions

Božiček

Kilter

Sarnet

et al. 2018

IEEE Trans. on Ind. Applicat.

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Harmonic emissions of power electronic (PE) devices connected to transmission networks are introducing new and rising trends of harmonic distortion. Analyses, which focus on assessing the harmonic levels in PE-rich power networks of the future, are mostly based on digital simulations, which require accurate models of the power system and connected devices. The simulations are usually performed with the use of EMT models, resulting in long simulation times, or the use of over-simplified load-flow models. In this paper, we propose a methodology that can be used to define accurate frequency-domain simulation models of PE devices. The models are derived by frequency-dependent multi-parameter scanning. The resulting models can be employed for harmonic load-flow simulations in different network and PE-device operating conditions. They enable the assessment of the impact of frequency-dependent network-impedance characteristics and, moreover, the effect of cross-coupling between different frequency components. The analysis is focused on high-power, high-voltage power-electronic devices, which cannot be easily measured or analyzed for harmonic characteristics. Therefore, the methodology requires detailed EMT models of the devices, which are analyzed within different operating conditions. The accurate equivalent models of PE devices represent a crucial element within the context of harmonic emission studies in large transmission networks.

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Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Cited by 123 publications

References 13 publications

Genetic Algorithm Methodology for the Estimation of Generated Power and Harmonic Content in Photovoltaic Generation

Genetic Algorithm Methodology for the Estimation of Generated Power and Harmonic Content in Photovoltaic Generation

Analysis and Modelling of Power-Dependent Harmonic Characteristics of Modern PE Devices in LV Networks

Harmonic Emissions of Power Electronic Devices Under Different Transmission Network Operating Conditions

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