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Model predictive torque ripple reduction with weighting factor based on interior permanent magnet synchronous motor

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Model predictive torque ripple reduction with weighting fact...

Retrieval Single-Doppler Radar Wind with Variational Assimilation Method-Part I: Objective Selection of Functional weighting factors

第32届中国过程控制会议(CPCC2021)

作者： Genglong Yan Feng Pan Da Chen Moutai Institute Taiyuan University of Science and Technology

Model predictive torque control is a flexible control scheme with fast dynamic in the field of power converter and drive’s ***,according to above method,the optimization of weighting factor is always been the key to the question of torque and flux ***,a weighting factor optimization for reducing the torque and flux ripple of interior permanent magnet synchronous motor is introduced and presented in this *** proposed method takes advantage of the discrete phenomena of power converter and predicts the future state of the system *** the next sampling period,the method selects the next but one period to eliminate the program *** introduced method is verified by simulations and shows potential control,tracking of variables with their respective references and consequently reduces the torque and flux ripples corresponding to conventional model predictive torque control method.

关键词： Finite control set Permanent Magnet Synchronous Motor Predictive torque controls weighting factor

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Advances in Atmospheric Sciences 1998年第4期15卷 123-138页

作者：魏鸣党人庆葛文忠 Department of Atomspheric Sciences Nanjing University 210093 Nanjing

In variational problem, the selection of functional weighting factors (FWF) is one of the key points for discussing many relevant studies. To overcome arbitrariness and subjectivity of the empirical selecting methods used widely at present, this paper tries to put forward an optimal objective selecting method of FWF. The focus of the study is on the weighting factors optimal selection in the variation retrieval single-Doppler radar wind field with the simple adjoint models. weighting factors in the meaning of minimal variance are calculated out with the matrix theory and the finite difference method of partial differential equation. Experiments show that the result is more objective comparing with the factors obtained with the empirical method.

关键词： Variation weighting factor Minimum variance Objective selection

Direct Power Control Based on Dead-beat Function and Extended Kalman Filter for PV Systems

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 863-872页

作者： Mostafa Ahmed Ibrahim Harbi Ralph Kennel Mohamed Abdelrahem Chair of High-Power Converter Systems(HLU) Technical University of Munich(TUM)80333 MunichGermany Department of Electrical Engineering Faculty of EngineeringAssiut UniversityAssiut 71515Egypt Department of Electrical Engineering Faculty of EngineeringMenoufia UniversityShebin El-Koum 32511Egypt IEEE

In this paper,a new proposal for the implementation of the well-known direct power control(DPC)technique in grid-connected photovoltaic(PV)systems is ***,the DPC is executed using a look-up table procedure based on the error between the actual and reference values of the active and reactive ***,the structure of the DPC is simple and results in a fast transient behavior of the inner current loop(injected currents).Therefore,in the current study,the DPC is reformulated using a dead-beat *** this formulation,the reference voltage vector(RVV)is obtained in theα-βreference ***,the switching states for the inverter can be obtained based on the sign of the components of the *** suggested DPC is compared with the conventional one and other switching tables,which are intended for performance ***,an extended Kalman filter(EKF)is utilized to eliminate all grid-voltage ***,the switching frequency of the proposed technique is minimized without any need for weighting factors or cost function *** overall control technique is validated using a hardware-in-the-loop(HIL)experimental set-up and compared with other schemes under different operating conditions.

关键词： Photovoltaic(PV)system direct power control(DPC) sensorless control switching frequency minimization weighting factor

Cascaded Model Predictive Control of Six-phase Permanent Magnet Synchronous Motor with Fault Tolerant Ability

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CES Transactions on Electrical Machines and Systems 2023年第3期7卷 311-319页

作者： Ling Feng Zhaohui Wang Jianghua Feng Wensheng Song CRRC Zhu Zhou Institude Co. Ltd.ZhuZhou 412001China School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China IEEE

In the field of high-power electric drives, multiphase motors have the advantages of high power-density, excellent fault tolerance and control flexibility. But their decoupling control and modulation process are much more complicated compared with three-phase motors due to the increased degree of freedom. Finite control set model predictive control can reduce the difficulties of controlling six-phase motors because it does not require modulation process. In this paper, a cascaded model predictive control strategy is proposed for the optimal control of high-power six-phase permanent magnet synchronous motors. Firstly, the current prediction model of torque and harmonic subspaces are established by decoupling the six-phase spatial variables. Secondly, a cascaded cost function with fault-tolerant capability is proposed to eliminate the weighting factor in the cost function. And finally, the proposed strategy is demonstrated through theoretical analysis and experiments. It is validated that the proposed method is able to maintain excellent steady-state control accuracy and fast dynamic response while significantly reduce the control complexity of the system. Besides, it can easily achieve fault-tolerant operation under open-phase fault.

关键词： Fault-tolerant control Model predictive control Permanent magnet synchronous motor Six-phase motor weighting factor

Coordinated Control Strategy for Harmonic Compensation of Multiple Active Power Filters

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Energy Engineering 2022年第2期119卷 609-620页

作者： Jianfeng Yang Rende Qi Yang Liu Yu Ding School of Automation&Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

In order to minimize the harmonic distortion rate of the current at the common coupling point,this paper proposes a coordinated allocation strategy of harmonic compensation capacity considering the performance of active power filters(APF).On the premise of proportional distribution of harmonic compensation capacity,the harmonic compensation rate of each APF is considered,and the harmonic current value of each APF to be compensated is *** the same time,the communication topology is *** APF takes into account the compensation ability of other ***,three APFs with different capacity and performance are configured at the harmonic source to suppress the same harmonic source,and the harmonic distortion rate is reduced to 1.73%.The simulation results show that the strategy can effectively improve the compensation capability of the multiple APF cascaded system to the power grid without increasing the installed capacity.

关键词： Active power filter collaborative optimization harmonic compensation rate weighting factor communication topology

Recognition of 3-D Aircrafts by Fourier Descriptors with Fast and Efficient Library Search

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Wuhan University Journal of Natural Sciences 1998年第2期3卷 169-174页

作者： Zhao Hengzhuo, Wang Yanping(College of Electronic Information, Wuhan University, Wuhan 430072, China) Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***)

Fourier descriptors are used as features for 3-D aircraft classification and pose determination from a 2-D image recorded at an arbitrary viewing angle. By the feature ranking of Fourier descriptors, a classification procedure based on the fast nearest neighbour rule is proposed to save the matching time of an unknown aircraft with a partial library search. The testing results of some typical examples indicate this method is generally applicable and efficient in 3-D aircraft recognition.

关键词： pattern recognition Fourier descriptors nearest neighbour rule feature rank weighting factor distance bound

Effect of local thermal sensation on whole-body thermal sensation under stable non-uniform environment

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Journal of Southeast University(English Edition) 2010年第2期26卷 238-242页

作者：丁千茹金权李祥立端木琳大连理工大学土木工程学院大连116024

To reveal the principles of human thermal responses and find out the effects of body parts on whole-body thermal sensation,through a subjective survey,experimental investigations on human responses are carried out when a single body part is thermally *** airflow is sent to seven body parts,*** 94 samples are *** eliminate the obvious multicollinearity of thermal sensation among different body parts,the principal component regression approach is adopted to obtain the principal components for the body parts under different experimental *** regression and analysis of principal components,the weighting factors of the seven body parts are obtained.A predictive model on whole-body thermal sensation is obtained based on the weighting *** results show that the different characteristics of trunk and limbs are clearly *** weighting factors of local thermal sensation are integrated values,and there is little difference among values of different body parts.

关键词： local thermal sensation whole-body thermal sensation non-uniform environment weighting factor

Estimation of Site Effects on Stations in the Capital Circle Region Using the Generalized Inversion Method

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Earthquake Research in China 2010年第2期24卷 198-210页

作者： Shi Haixia Xiu Jigang Chen Zhangli Wang Qincai Hua Wei China Earthquake Networks Center Beijing 100045 China China Earthquake Administration Beijing 100036 China Institute of Earthquake Science Beijing 100036 China

Generalized Inversion Method has been used to estimate the spatial variation of site effects,using the digital data of SH-waves recorded by 63 stations in the Capital Circle Region of China from 2001 to *** gained the site effects of all stations participating in the *** found that the site effect of rock was stabile and about 1.0 from 1.0Hz to 10.0Hz,while the site effect of deposit was high in low frequencies,about 3 ～ 7 from 1.0Hz to 8.0Hz,and the site effect was protuberant at about 5.0Hz,then fell as the frequency *** result shows the shape and intensity of station site effects are mainly influenced by the lithology below the station,and possibly also by the local geological structure.

关键词： Capital Circle Region Site effects Generalized inversion method SH-wave weighting factor

Weighted Symbol Flipping Decoding for Non-binary LDPC Codes Based on Iteration Stopping Criterion

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Weighted Symbol Flipping Decoding for Non-binary LDPC Codes ...