The integration of nine-phase permanent magnet synchronous machines (nine-phase PMSMs), employed in on-board integrated battery charger for electric vehicles (EVs), into three-phase grid generates an inevitable torque...
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The integration of nine-phase permanent magnet synchronous machines (nine-phase PMSMs), employed in on-board integrated battery charger for electric vehicles (EVs), into three-phase grid generates an inevitable torque fluctuation in charging and vehicles to grid (V2G) modes. This undesirable torque, which is the source of motor vibration and noise, is due to the interaction among the zero-sequence current, triplen harmonics (third and ninth) of induced back electromotive force, and rotor position. In this article, a new solution for nine-winding integrated battery chargers of EVs is considered. A segmented three-phase PMSM with nine windings is used to replace the nine-phase PMSMs. With this configuration, the system has the advantage of torque-free in charging/V2G mode, low core loss, and simple control (based on the three-phase control) in both traction and charging/V2G modes, with the privilege of employing the reduced number of sensor and with no additional new elements. Through proper three-phase control strategy, the system operates under unity power factor with total harmonic distortion below 5%. Control strategies for charging, V2G, and motoring are given;moreover, the simulation and experimental results are provided to validate the theoretical analysis.
Despite the fact that mean squared error (MSE) is the most widely used image/video fidelity criterion, it requires the availability of original image and large computational resources for its computation. The non-avai...
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Despite the fact that mean squared error (MSE) is the most widely used image/video fidelity criterion, it requires the availability of original image and large computational resources for its computation. The non-availability of original images limits the use of MSE as a quality metric in many practical scenarios. This paper proposes to use MSE reduction (MSER) with reference to null image for estimating the fidelity of images decoded from embedded bitstreams without the original image. MSER is generally used for rate allocation, optimal error protection, etc. However, MSER gives information about the improvement in fidelity of decoded image, rather than its absolute value. It is proposed to estimate MSE from MSERf\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\textit{MSER}}_f$$\end{document} (MSE reduction in lossless bitstream) and MSERd\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\textit{MSER}}_d$$\end{document} (MSE reduction at desired bitrate/fidelity). The MSERd\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\textit{MSER}}_d$$\end{document} can be calculated at decoder side while decoding the embedded bitstream at desired rate. MSERf\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\textit{MSER}}_f$$\end{document} is fixed and independent
This paper deals with the V/f control of a five-phase induction machine. Carrier-based sinusoidal PWM modulation for five phases is presented together with an open-loop and closed-loop control structure. The implement...
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ISBN:
(纸本)9781728175423
This paper deals with the V/f control of a five-phase induction machine. Carrier-based sinusoidal PWM modulation for five phases is presented together with an open-loop and closed-loop control structure. The implementation of the algorithm is provided with the automated code generation and pure Simulink-based solution is shown in the paper. Experimental results, realized on Texas Instruments F28335 DSP, illustrating the performance of the five phase VSI prototype and five phase induction machine on both open-loop and closed-loop control structures, are included and mutually compared.
This paper proposes a generalized and mathematically less intensive algorithm for implementing space vector pulse-width modulation in multilevel inverters. It simplifies the space vector diagram (SVD) of a (2(n) + 1)-...
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This paper proposes a generalized and mathematically less intensive algorithm for implementing space vector pulse-width modulation in multilevel inverters. It simplifies the space vector diagram (SVD) of a (2(n) + 1)-level inverter, stepwise, into a basic two-level case using "n" pivot vectors and proposes a considerable reduction in the switching analysis based on a noteworthy relationship elucidated and established between the switching sequences of the various two-level hexagons of the multilevel SVD. It is proposed that the switching sequences of a (2(n) + 1)-level inverter with 6(n) two-level hexagons in its SVD can be derived by investigating the switching combinations of merely 2(n) two-level hexagons, irrespective of the voltage source inverter topology, thereby reducing the memory requirements for lookup tables and the computation time of the processor considerably. The algorithm has been successfully simulated in the MATLAB/Simulink environment and experimentally verified on the laboratory prototypes of multiple multilevel topologies. Experimental implementation using a digital signal processor (DSP) with the embedded coder tool from Simulink toolbox obviates the need for conventional DSP programming, adding to the simplicity of the proposed algorithm.
This paper presents a listless variant of a modified three-dimensional (3D)-block coding algorithm suitable for medical image compression. A higher degree of correlation is achieved by using a 3D hybrid transform. The...
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This paper presents a listless variant of a modified three-dimensional (3D)-block coding algorithm suitable for medical image compression. A higher degree of correlation is achieved by using a 3D hybrid transform. The 3D hybrid transform is performed by a wavelet transform in the spatial dimension and a Karhunen-Loueve transform in the spectral dimension. The 3D transformed coefficients are arranged in a one-dimensional (1D) fashion, as in the hierarchical nature of the wavelet-coefficient distribution strategy. A novel listless block coding algorithm is applied to the mapped 1D coefficients which encode in an ordered-bit-plane fashion. The algorithm originates from the most significant bit plane and terminates at the least significant bit plane to generate an embedded bit stream, as in 3D-SPIHT. The proposed algorithm is called 3D hierarchical listless block (3D-HLCK), which exhibits better compression performance than that exhibited by 3D-SPIHT. Further, it is highly competitive with some of the state-of-the-art 3D wavelet coders for a wide range of bit rates for magnetic resonance, digital imaging and communication in medicine and angiogram images. 3D-HLCK provides rate and resolution scalability similar to those provided by 3D-SPIHT and 3D-SPECK. In addition, a significant memory reduction is achieved owing to the listless nature of 3D-HLCK.
We developed knob operated shift control strategy used on pure electric vehicles by use of Matlab 2015 b and its embedded coder(EC) toolbox based on the V-model development process. Firstly, the functional requirement...
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We developed knob operated shift control strategy used on pure electric vehicles by use of Matlab 2015 b and its embedded coder(EC) toolbox based on the V-model development process. Firstly, the functional requirements of knob operated shift strategy were analyzed, a simulation system based on finite-state machine was established in Simulink/Stateflow, the input and output signals, and the parameters of the model were scaled. Secondly, C code were automatic generated by use of EC toolbox, test cases were compiled with Excel, model in loop(MIL) and software in loop(SIL) auto test tool were used and the model was tested and modified. Test results indicate that, under different conditions, the dynamic response of knob operated shift function meet the design requirements.
In this study, modeling and simulation of a speed sensored field-oriented control (FOC) of a permanent magnet synchronous motor (PMSM) drive is developed by using MATLAB Function blocks in MATLAB/Simulink. This method...
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ISBN:
(纸本)9781509002061
In this study, modeling and simulation of a speed sensored field-oriented control (FOC) of a permanent magnet synchronous motor (PMSM) drive is developed by using MATLAB Function blocks in MATLAB/Simulink. This method allows easier algorithm and software development stages for experimental studies compared to the classical block diagram approach. The superiority of the method over commonly used "Code Generation" tools is also emphasized. First, a MATLAB/Simulink model of the FOC of PMSM drive is developed by using MATLAB programming in MATLAB Functions similar to C coding techniques. The results of the simulation are presented. Then, the MATLAB programming based codes developed in simulation are implemented in a TMS320F28335 floating-point MCU by using C programming language and the experimental results are obtained. Finally, the results of the simulation and experiments are compared.
In this paper, an efficient, low memory embedded wavelet based color image coding technique is presented. The proposed algorithm is a listless variant of improved color set partitioning embedded block coding (CSPECK) ...
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ISBN:
(纸本)9781479953646
In this paper, an efficient, low memory embedded wavelet based color image coding technique is presented. The proposed algorithm is a listless variant of improved color set partitioning embedded block coding (CSPECK) algorithm. The inter-dependency among color planes is exploited by using novel clustering arrangement of luminance and chrominance subbands. This facilitate to encode simultaneously inter and intra subbands of luminance and chrominance components located at the same spatial locations in a hierarchical wavelet arrangement. This technique shows a significant improvement of peak-signal-to-noise-ratio (PSNR) values in most of the standard color images and videos at lower bit rates. The memory requirement of the coder is reduced by almost 84% than CSPECK.
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