Inverter open circuit fault diagnosis strategy based on KNN algorithm
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This paper presents a characteristic comparison between a five-leg inverter and a nine-switch inverter. The five-leg inverter and the nine-switch inverter is a single inverter that can drive two AC motors independently. Concretely, we show a circuit architecture of both inverters, a modulation method for an independent drives and a division of voltage utility factor. Moreover, investigate about the inverter losses and a switching device capacity in driving two AC motors independently and adapting a control method to decrease the inverter losses.
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An attractive feature of a multilevel inverter is the low common mode voltage (CMV). This means that in a switching cycle the peak to peak (P-to-P)CMV and the value at which transition of CMV happens have lower magnitudes for a multilevel inverter (MLI) compared to a 2-level inverter. This is an important advantage but still does not justify the use of MLIs on account of economic and component count factors. To offset this limitation, this paper proposes a modified 2-level three-phase inverter which exhibits similar reduced CMV performance as does a 3-level inverter. The proposed inverter uses only two extra switches, which makes the total number of switches as 8. The two extra switches allow one of the inverter legs (out of 3) to function as a 3-level inverter leg, while the other 2 legs continue to work as 2-level inverter legs. This results in a unique space vector (SV) diagram with 12 SVs whereas a traditional 2-level inverter has only 8 SVs. It is shown that by appropriately using these 12 SVs a similar CMV performance of a 3-level inverter can be achieved using the proposed topology. Simulation studies are carried out using the PLECS software to validate the various claims.
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Common-mode signal
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Robust face recognition is a challenging problem, due to facial appearance variations in illumination, pose, expression, aging, partial occlusions and other changes. This paper proposes a novel face recognition approach, where face images are represented by Gabor pixel-pattern-based texture feature (GPPBTF) and local binary pattern (LBP), and null pace-based kernel Fisher discriminant analysis (NKFDA) is applied to the two features independently to obtain two recognition results which are eventually combined together for a final identification. To get GPPBTF, we first transform an image into Gabor magnitude maps of different orientations and scales, and then use pixel-pattern-based texture feature to extract texture features from Gabor maps. In order to improve the final performance of the classification, this paper proposes a multiple NKFDA classifiers combination approach. Extensive experiments on FERET face database demonstrate that the proposed method not only greatly reduces the dimensionality of face representation, but also achieves more robust result and higher recognition accuracy.
Local Binary Patterns
Kernel (algebra)
Three-dimensional face recognition
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The application of the inverter is wider and wider in the aluminium industry,and it is important to choose the inverter,to maintain the inverter,and to diagnose the fault of the inverter.According to the characteristic of loads in the aluminium industry,this paper introduces the method of choosing the inverter,and gives the maintenance and diagnosing ways to the inverter.
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Using general-purpose inverter to control load of fan,pump can save energy effectively.When the general-purpose inverter is prepared for the existing motor,it is necessary to select the types of inverter according to the actual situation firstly,then it is important to calculate the rated value of inverter accurately,to achieve the best cost performance.The basic principle of selecting inverter shall be that the total current of load with continuous running does not exceed the inverter's rated current.
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Value (mathematics)
Electronic speed control
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article Free Access Share on Remarks on Algorithm 332: Jacobi polynomials: Algorithm 344: student's t-distribution: Algorithm 351: modified Romberg quadrature: Algorithm 359: factoral analysis of variance Author: Arthur H. J. Sale Univ. of Sydney, Sydney, Australia Univ. of Sydney, Sydney, AustraliaView Profile Authors Info & Claims Communications of the ACMVolume 13Issue 7July 1970 https://doi.org/10.1145/362686.362700Published:01 July 1970Publication History 0citation275DownloadsMetricsTotal Citations0Total Downloads275Last 12 Months10Last 6 weeks3 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my Alerts New Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF
Quadrature (astronomy)
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Abstract This paper presents a nine‐switch inverter that can drive two AC motors independently. Recently, as an inverter that can drive them independently, a five‐leg inverter has been proposed. Ten switching devices are used for the five‐leg inverter, whereas only nine are used for the nine‐switch inverter. So, the nine‐switch inverter has the merit that one switching device can be reduced compared to the five‐leg inverter. Moreover, the maximum output voltage of the nine‐switch inverter equals that of the five‐leg inverter. In this work, we propose the structure of the nine‐switch inverter and a modulation method for the same, and validate the nine‐switch inverter by showing simulation results. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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This paper proposes a novel inverter named nine-switch inverter. The inverter has nine switching devices and can control two loads. First, the configuration of the inverter is introduced. Then, a PWM method for the inverter is elaborated. The validity of the inverter is verified by simulations and experiments. In addition, this paper proposes a 3N + 3-switch inverter, which is an extension of the nine-switch inverter. This inverter has 3N + 3 switches and can control N loads independently. The validity of the 3N + 3-switch inverter is also verified by simulations.
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