Methods for Ripple Index evaluation in DC Low Voltage Distribution Networks

Mariscotti, Andrea

doi:10.1109/imtc.2007.379205

Cited by 26 publications

(32 citation statements)

References 8 publications

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“…The expressions defined in [20] are briefly summarized. Given the q(t) quantity (in this case the pantograph voltage V p ), the peak-to-peak value q pp over m T samples interval is the exact ripple index, RI, that is the maximum peak-to-peak value over a given time interval, and is given by…”

Section: Ripple and Useful Voltagementioning

confidence: 99%

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Characterization of Power Quality transient phenomena of DC railway traction supply

Mariscotti

2012

ACTA IMEKO

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<span style="font-size: 10.0pt; mso-bidi-font-size: 12.0pt; font-family: ";Minion Pro";; mso-fareast-font-family: ";Times New Roman";; mso-bidi-font-family: ";Times New Roman";; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-GB">DC railways are considered as an example of a complex distribution network, featuring distributed supply and moving loads. The Power Quality phenomena affecting traction voltage are many, steady and transient, depending on the converter operations at substations and on-board vehicles. A classification is proposed and a discussion follows of the correct methods for their quantification, with reference to related standards and to the vast background related to ac networks. The characterization of PQ is related on one side to ripple and fluctuation of the pantograph variables for supply purposes, and on the other side to the appearance of specific components relevant for interference to signalling on the track. Considerations and conclusions are based on a large amount of measured waveforms, recorded on the Italian railway networks, and are aimed at contributing to the forthcoming standards on traction supply quality.</span>

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Section: Ripple and Useful Voltagementioning

confidence: 99%

“…RI is then calculated as the sum of the components of the set K thr , containing values of the index k with corresponding component Q[k] with amplitude larger than a given threshold thr; Sum-of-Amplitudes (SA) and Sum-of-Amplitudes-and-Phases (SAP) rules, as given in [20] ,…”

Section: Ripple and Useful Voltagementioning

confidence: 99%

Characterization of Power Quality transient phenomena of DC railway traction supply

Mariscotti

2012

ACTA IMEKO

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“…Therefore, the VMD algorithms is promising in detecting the real-life non-stationary signals of DC links. There are only a few articles on the ripple detection of DC signal [33]. The discrete Fourier transform (DFT) algorithm for ripple evaluation in DC Low Voltage networks are presented in [33], which exhibits similar performance with the analog bandpass filter.…”

Section: Introductionmentioning

confidence: 99%

Application of VMD and Hilbert Transform Algorithms on Detection of the Ripple Components of the DC Signal

Luo

et al. 2020

Energies

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Accurate detection of ripple components of the direct-current (DC) signals is essential for evaluating DC power quality. In this study, the combination algorithm based on variational mode decomposition (VMD) and Hilbert transform (HT) is applied to detect and analyze the characteristics of the ripple components of the DC disturbance signals. Firstly, the optimal modal number of VMD algorithms is comprehensively determined by observing the center frequencies of the mode components and the Index of Orthogonality (IO) of mode components. Through utilizing the VMD algorithm, the DC disturbance signal is accurately decomposed into a series of amplitude modulation-frequency modulation (AM-FM) functions. Then, the HT algorithm is applied to each AM-FM function to obtain the corresponding instantaneous amplitude and frequency, and the characteristics of DC disturbance signal are determined. Some case studies are implemented to analyze the ripple components of the DC disturbance signal with the VMD-HT and empirical mode decomposition (EMD) algorithm. Finally, the experiment results of Gree Photovoltaic Cabin have verified the feasibility and effectiveness of the proposed combination VMD-HT algorithm by comparison with EMD and the window interpolation fast Fourier transform (WIFFT) algorithms.

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“…microgrid is a relatively new form of distribution network, for which there is a substantial lack of [2]. A literature review and discussion pap PQ aspects for DC distribution systems and microgrids is presented in [3].…”

mentioning

confidence: 99%

“…This study however does not actually define and quantify power quality parameters. [2]. One of tempts in defining significant phenomena for distribution power systems is analogy with the [3,4] for electromagnetic compatibility (EMC).…”

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confidence: 99%

Analytical derivation of PQ indicators compatible with control strategies for DC microgrids

Ciornei

Albu

Sănduleac

et al. 2017

2017 IEEE Manchester PowerTech

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virgin grounds of research. role both in the design scheme to be adopted quantitative and qualitative quality into account. This work quantifying a set of power quality We relate our analysis on the design aspect converters and loads in a stand Index Terms quality resources layer low CO2 emissions energy efficiency policies and increase resilience (LV) energy resources (mostly of rene power electronic together. T current DC microgrid is then DC generic schematic of such a microgrid is presented in Note that most of the were designed only of the other equipment connected at the same DC implications of this aspect on some power quality issues will be discussed in the next section of this paper. Abstract-Power quality related to virgin grounds of research. role both in the design scheme to be adopted quantitative and qualitative quality features into account. This work quantifying a set of power quality We relate our analysis on the design aspect converters that are the most critical elements interfacing sources and loads in a stand Index Terms-DC quality, signal processing There is a tremendous increase in th resources used for electricity generation in layer of power distribution system, especially low CO2 emissions energy efficiency policies and increase resilience (LV) microgrids are part of this recent trend where a blend of energy resources (mostly of rene power electronic together. They current and they interface one another through one or more DC buses with microgrid is then DC/AC voltage source i generic schematic of such a microgrid is presented in Note that most of the were designed only of the associated other equipment connected at the same DC implications of this aspect on some power quality issues will be discussed in the next section of this paper.A DC microgrid is a relatively new form of power network, for which there is a substantial Power quality related to virgin grounds of research. However, role both in the design stage and on scheme to be adopted. Currently there is no quantitative and qualitative analysis on which of the are the most stringent const into account. This work is quantifying a set of power quality We relate our analysis on the design aspect that are the most critical elements interfacing sources and loads in a stand-alone low voltage DC/DC power converters, processing.

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Methods for Ripple Index evaluation in DC Low Voltage Distribution Networks

Cited by 26 publications

References 8 publications

Characterization of Power Quality transient phenomena of DC railway traction supply

Characterization of Power Quality transient phenomena of DC railway traction supply

Application of VMD and Hilbert Transform Algorithms on Detection of the Ripple Components of the DC Signal

Analytical derivation of PQ indicators compatible with control strategies for DC microgrids

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