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Detalles de la revista
Formato
Revista
eISSN
2543-4292
ISSN
2451-0262
Publicado por primera vez
16 Apr 2016
Periodo de publicación
1 tiempo por año
Idiomas
Inglés

Buscar

Volumen 3 (2018): Edición 1 (December 2018)

Detalles de la revista
Formato
Revista
eISSN
2543-4292
ISSN
2451-0262
Publicado por primera vez
16 Apr 2016
Periodo de publicación
1 tiempo por año
Idiomas
Inglés

Buscar

17 Artículos
Acceso abierto

Model Predictive Control of Four-Leg Three-Level Flying Capacitor Converter: Influence of Model Parameter Mismatch

Publicado en línea: 17 Nov 2018
Páginas: 1 - 9

Resumen

Abstract

This paper presents a control method for a four-leg three-level flying capacitor converter (FCC) operating as a shunt active power filter (SAPF), based on model predictive control with finite number of control states (FS-MPC). Current control and capacitor voltage balancing are described. Influence of the mismatch of the inductive filter model parameters on the current control precision is analysed. Results are supported by the experimental waveforms obtained with a 10kVA set-up.

Palabras clave

  • Multilevel converter
  • Current control
  • Model predictive control (MPC)
  • Shunt active power filter (SAPF)
Acceso abierto

Effects of Grid Disturbances on Current Source Rectifier Controlled by FCS-MPC Algorithm

Publicado en línea: 17 Nov 2018
Páginas: 11 - 22

Resumen

Abstract

Nowadays, the increasing number of non-linear loads influences the grid, causing grid voltage disturbances. These disturbances may be very dangerous for the equipment and can create faults in converter behaviour. However, the right control algorithm can improve the reliability of the work. For a current source rectifier, the finite control set model predictive control has been proposed. This method is very flexible because of the variety of the possible cost function forms. It has been examined under grid voltage disturbed by the higher harmonics and the voltage drop. Simulation results prove the ability to damp the distortions and to ensure the unity power factor. Summing up, the algorithm is a very good solution for use in applications such as battery charging, active power filtering and low-voltage direct current load feeding.

Palabras clave

  • active front end
  • current source rectifier
  • model predictive control
  • active damping
Acceso abierto

Application of Super-Twisting Sliding Mode Controllers in Direct Field-Oriented Control System of Six-Phase Induction Motor: Experimental Studies

Publicado en línea: 17 Nov 2018
Páginas: 23 - 34

Resumen

Abstract

This paper presents the direct field-oriented control (DFOC) method of six-phase induction motor with the application of super-twisting sliding mode algorithm. The mathematical model of the six-phase induction motor has been described. The descriptions of the space vector modulation (SVM) method and the super-twisting algorithm have been presented. The DFOC method with super-twisting sliding mode controllers has been described. The experimental studies of the DFOC method with super-twisting controllers have been performed, and the results of these studies are presented and discussed.

Palabras clave

  • six-phase squirrel-cage induction motor
  • direct field-oriented control method
  • super-twisting sliding mode control
  • experimental studies
Acceso abierto

PMSM Servo-Drive Fed by SiC MOSFETs Based VSI

Publicado en línea: 17 Nov 2018
Páginas: 35 - 45

Resumen

Abstract

The article presents modern PMSM servo-drive with SiC MOSFETs power devices and microprocessor with ARM Cortex core. The high switching frequency is obtained due to the application of high efficient power switching components and powerful microprocessor. It allows to achieve good dynamical properties of current control loop, proper disturbance compensation and silent operation of servo-drive. Experimental tests results obtained for two different control schemes (i.e., cascade control structure and state feedback position control) are presented.

Palabras clave

  • PMSM
  • servo-drive
  • SiC MOSFET
  • FOC control
  • state feedback control
Acceso abierto

Vertical Transportation: Effects of Harmonics of Drives by PM Machines

Publicado en línea: 17 Nov 2018
Páginas: 47 - 53

Resumen

Abstract

Permanent magnet motor drive is a widely used technology, offering many advantages, such as exceptional speed, torque control and greater flexibility. Improvement of reliability and efficiency has become a great research interest. Towards this direction and taking into account the major developments in permanent machine technology over the recent years, the use of energy recovery converters has been introduced in various industrial applications. In this paper, the effects of harmonics on a three-phase motor controlled by a drive are analysed, and the behaviours of the filter topology after adopting regenerative drives are studied. The main contribution of this study is a methodology to foresee the standards that can be achieved with the use of an active front end system topology with filters. Moreover, the use of an optimum filter that eases the power system distortion is presented. The analysis presented in this paper is validated experimentally.

Palabras clave

  • Elevators
  • Permanent magnet synchronous machine
  • Adjustable speed drive
  • Quality
  • Safety
  • Reliability
  • Robustness
Acceso abierto

Extended T-type Inverter

Publicado en línea: 17 Nov 2018
Páginas: 55 - 64

Resumen

Abstract

This paper presents a new concept for a power electronic converter - the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide-semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.

Palabras clave

  • Multilevel inverter
  • T-type inverter
  • Boost converter
  • Silicon carbide
Acceso abierto

Novel Converter for Voltage Balance in Series-Connected Capacitors and Batteries

Publicado en línea: 17 Nov 2018
Páginas: 65 - 74

Resumen

Abstract

This paper presents a novel concept of a circuit for voltage balance of three series-connected capacitors or batteries, as well as the research results. The problem is related to the control of voltage sharing on series capacitors, supercapacitors or battery banks in energy storage systems or direct current (DC)-link of four-level neutral-point-clamped inverters. The proposed circuit is a switched-capacitor (SC) resonant converter composed of a single capacitor and seven transistor switches. Control of the converter makes it possible to transfer energy between any capacitors, by switching selected transistors. This paper presents the basic concept of the converter, an analysis of control strategies and the simulation results for various cases of voltage balancing.

Palabras clave

  • Capacitor voltage balance
  • Multilevel converter
  • NPC four-level inverter
  • Voltage sharing
  • Supercapacitor
  • Battery
Acceso abierto

A Cost-Effective Resonant Switched-Capacitor DC-DC Boost Converter – Experimental Results and Feasibility Model

Publicado en línea: 17 Nov 2018
Páginas: 75 - 83

Resumen

Abstract

This paper presents the results of experimental research of a resonant switched capacitor voltage multiplier in a cost-effective topology (CESCVM) with a limited number of active switches. In the charging mode of the switched capacitors, the converter utilizes only one active switch and a required number of diodes. Therefore, the cost of the converter is decreased as compared with that of a classical SCVM converter, owing to a lower number of switches and gate driver circuits, as well as a smaller PCB area. Moreover, the CESCVM has simpler control circuits and higher reliability. This paper presents the original experimental results of the operation of the CESCVM converter. A concept of the bootstrap supply of gate drivers of the flying switches is also examined.

Palabras clave

  • DC-DC converter
  • switched-capacitors
  • voltage multiplier
  • charge pump
  • ZCS
Acceso abierto

Performance and Stability Analysis of Series-Cascaded, High-Gain, Interleaved Boost Converter for Photovoltaic Applications

Publicado en línea: 17 Nov 2018
Páginas: 85 - 97

Resumen

Abstract

Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.

Palabras clave

  • series cascade
  • interleaved boost converter
  • high gain
  • stability
  • fast Fourier transform
Acceso abierto

Space Vector Pulse Width Modulation for High-Speed Induction Motor Implemented in Nios II Softcore Processor

Publicado en línea: 17 Nov 2018
Páginas: 99 - 107

Resumen

Abstract

The purpose of the article was to present the idea of space vector pulse width modulation (SVPWM) and implementation in Nios II softcore processor. The SVPWM module was described in a classical method in hardware description language both as an independent structure and as an additional component to softcore processor. The available methods were compared, and the experiment was carried out in the laboratory to test implemented SVPWM algorithm using high-speed induction motor.

Palabras clave

  • Induction motor
  • FPGA
  • Softcore processor

Special Section on Sensorless Drives

Acceso abierto

Introduction to the Special Section on State and Parameter Estimation Methods for Sensorless Drives

Publicado en línea: 17 Nov 2018
Páginas: 111 - 113

Resumen

Abstract

This short article constitutes an introductory part of the Special Section (SS) on State and Parameter Estimation Methods in Sensorless Drives. In the current issue of the journal, the first part of this section is published. Accepted articles are focussed mainly on estimation of the state variables and parameters for vector-controlled induction motor (IM) drives, using different concepts, such as different types of Kalman filters (KFs) and model reference adaptive systems (MRASs). The KF was also proposed for brushless DC motor (BLDC). Also, neural networks (NNs) have been proposed for mechanical state variables’ estimation of the drive system with elastic couplings.

Palabras clave

  • sensorless control
  • extended Kalman filter
  • unscented Kalman filter
  • MRAS estimators
  • neural networks
Acceso abierto

Extended Kalman Filter Based Speed-Sensorless Load Torque and Inertia Estimations with Observability Analysis for Induction Motors

Publicado en línea: 17 Nov 2018
Páginas: 115 - 127

Resumen

Abstract

This paper aims to introduce a novel extended Kalman filter (EKF) based estimator including observability analysis to the literature associated with the high performance speed-sensorless control of induction motors (IMs). The proposed estimator simultaneously performs the estimations of stator stationary axis components of stator currents and rotor fluxes, rotor mechanical speed, load torque including the viscous friction term, and reciprocal of total inertia by using measured stator phase currents and voltages. The inertia estimation is done since it varies with the load coupled to the shaft and affects the performance of speed estimation especially when the rotor speed changes. In this context, the estimations of all mechanical state and parameters besides flux estimation required for high performance control methods are performed together. The performance of the proposed estimator is tested by simulation and real-time experiments under challenging variations in load torque and velocity references; and in both transient and steady states, the quite satisfactory estimation performance is achieved.

Palabras clave

  • Extended Kalman filter
  • Induction motor
  • Load torque and inertia estimation
  • Speed-sensorless control
  • Observability analysis
Acceso abierto

Dynamic Performance of Estimator-based Speed Sensorless Control of Induction Machines Using Extended and Unscented Kalman Filters

Publicado en línea: 17 Nov 2018
Páginas: 129 - 144

Resumen

Abstract

This paper presents an estimator-based speed sensorless field-oriented control (FOC) method for induction machines, where the state estimator is based on a self-contained, non-linear model. This model characterises both the electrical and the mechanical behaviours of the machine and describes them with seven state variables. The state variables are estimated from the measured stator currents and from the known stator voltages by using an estimator algorithm. An important aspect is that one of the state variables is the load torque and, hence, it is also estimated by the estimator. Using this feature, the applied estimator-based speed sensorless control algorithm may be operated adequately besides varying load torque. In this work, two different variants of the control algorithm are developed based on the extended and the unscented Kalman filters (EKF, UKF) as state estimators. The dynamic performance of these variants is tested and compared using experiments and simulations. Results show that the variants have comparable performance in general, but the UKF-based control provides better performance if a stochastically varying load disturbance is present.

Palabras clave

  • Induction machine
  • speed sensorless control
  • field-oriented control (FOC)
  • non-linear state estimation
  • load torque estimation
  • extended Kalman filter (EKF)
  • unscented Kalman filter (UKF)
Acceso abierto

Simulation Analysis of Extended Kalman Filter Applied for Estimating Position and Speed of a Brushless DC Motor

Publicado en línea: 17 Nov 2018
Páginas: 145 - 155

Resumen

Abstract

The purpose of this paper was to present a method for the estimation of the rotor speed and position of brushless DC (BLDC) motor. The BLDC motor state equations were developed, and the model was discretised. Extended Kalman filter has been designed to observe specific states from the state vector, needed for the sensorless control (rotor position) and to determine the speed, which may be useful to use as a feedback for the controller. A test was carried out to determine the noise covariance matrices in a simulation manner.

Palabras clave

  • extended Kalman filter
  • brushless DC motor
  • covariance matrix
  • sensorless control for BLDC
Acceso abierto

Universal Speed and Flux Estimator for Induction Motor

Publicado en línea: 17 Nov 2018
Páginas: 157 - 169

Resumen

Abstract

In the paper, the concept of universal speed and flux estimator with additional parameters estimators is presented. Proposed solution is based on the Model Reference Adaptive System (MRAS) type flux and speed estimator and can be used in different industrial systems (especially in the automotive applications). Induction Motor (IM) parameters are estimated using the systems based only on simple simulators and adaptive systems (voltage model and current model). Proposed system was tested in the sensorless induction motor drive with the Direct Field Oriented Control (DFOC) algorithm. Simulation and experimental results are presented in the paper.

Palabras clave

  • Speed estimator
  • rotor flux estimator
  • parameter estimator
  • induction motor
  • MRAS
  • universal estimator
  • vector control
Acceso abierto

Comparative Stability Analysis of Stator Current Error-based Estimators of Induction Motor Speed

Publicado en línea: 17 Nov 2018
Páginas: 187 - 203

Resumen

Abstract

This paper deals with the stability problem of three stator current error-based estimators of induction motor speed, especially in the regenerating operation mode. The stability of the adaptive full-order observer (AFO) and two model reference adaptive systems (MRASs) based on a stator current error (MRASCCand MRASCV) is briefly analysed, and the stability borders are determined and compared. It is shown that MRASCVspeed estimator is stable in the whole operation range including the regenerating mode without any modifications. The stability enhancement method for AFO and MRASCCestimators is described, and the solution for their stability improvement is proposed. Torque-speed characteristics of the analysed MRAStype estimators in a wide range of drive speed and load torque changes are given, as well as the behaviour of estimators during transients is compared. The theoretical analysis and simulation test results are validated by experimental tests.

Palabras clave

  • induction motor
  • MRAS-type estimators
  • stability
  • regenerating mode
Acceso abierto

Neural State Estimator for Complex Mechanical Part of Electrical Drive: Neural Network Size and Performance of State Estimation

Publicado en línea: 17 Nov 2018
Páginas: 205 - 216

Resumen

Abstract

This paper presents the results of simulation research of an off-line-trained, feedforward neural-network-based state estimator. The investigated system is the mechanical part of an electrical drive characterised by elastic coupling with a working machine, modelled as a dual-mass system. The aim of the research was to find a set of neural network structures giving useful and repeatable results of the estimation. The mechanical resonance frequency of the system has been adopted at the level of 9.3-10.3 Hz. The selected state variables of the mechanical system are load, speed and stiffness torque of the shaft.

Palabras clave

  • two-mass drive
  • neural network
  • simulation studies
  • non-linear state estimation
17 Artículos
Acceso abierto

Model Predictive Control of Four-Leg Three-Level Flying Capacitor Converter: Influence of Model Parameter Mismatch

Publicado en línea: 17 Nov 2018
Páginas: 1 - 9

Resumen

Abstract

This paper presents a control method for a four-leg three-level flying capacitor converter (FCC) operating as a shunt active power filter (SAPF), based on model predictive control with finite number of control states (FS-MPC). Current control and capacitor voltage balancing are described. Influence of the mismatch of the inductive filter model parameters on the current control precision is analysed. Results are supported by the experimental waveforms obtained with a 10kVA set-up.

Palabras clave

  • Multilevel converter
  • Current control
  • Model predictive control (MPC)
  • Shunt active power filter (SAPF)
Acceso abierto

Effects of Grid Disturbances on Current Source Rectifier Controlled by FCS-MPC Algorithm

Publicado en línea: 17 Nov 2018
Páginas: 11 - 22

Resumen

Abstract

Nowadays, the increasing number of non-linear loads influences the grid, causing grid voltage disturbances. These disturbances may be very dangerous for the equipment and can create faults in converter behaviour. However, the right control algorithm can improve the reliability of the work. For a current source rectifier, the finite control set model predictive control has been proposed. This method is very flexible because of the variety of the possible cost function forms. It has been examined under grid voltage disturbed by the higher harmonics and the voltage drop. Simulation results prove the ability to damp the distortions and to ensure the unity power factor. Summing up, the algorithm is a very good solution for use in applications such as battery charging, active power filtering and low-voltage direct current load feeding.

Palabras clave

  • active front end
  • current source rectifier
  • model predictive control
  • active damping
Acceso abierto

Application of Super-Twisting Sliding Mode Controllers in Direct Field-Oriented Control System of Six-Phase Induction Motor: Experimental Studies

Publicado en línea: 17 Nov 2018
Páginas: 23 - 34

Resumen

Abstract

This paper presents the direct field-oriented control (DFOC) method of six-phase induction motor with the application of super-twisting sliding mode algorithm. The mathematical model of the six-phase induction motor has been described. The descriptions of the space vector modulation (SVM) method and the super-twisting algorithm have been presented. The DFOC method with super-twisting sliding mode controllers has been described. The experimental studies of the DFOC method with super-twisting controllers have been performed, and the results of these studies are presented and discussed.

Palabras clave

  • six-phase squirrel-cage induction motor
  • direct field-oriented control method
  • super-twisting sliding mode control
  • experimental studies
Acceso abierto

PMSM Servo-Drive Fed by SiC MOSFETs Based VSI

Publicado en línea: 17 Nov 2018
Páginas: 35 - 45

Resumen

Abstract

The article presents modern PMSM servo-drive with SiC MOSFETs power devices and microprocessor with ARM Cortex core. The high switching frequency is obtained due to the application of high efficient power switching components and powerful microprocessor. It allows to achieve good dynamical properties of current control loop, proper disturbance compensation and silent operation of servo-drive. Experimental tests results obtained for two different control schemes (i.e., cascade control structure and state feedback position control) are presented.

Palabras clave

  • PMSM
  • servo-drive
  • SiC MOSFET
  • FOC control
  • state feedback control
Acceso abierto

Vertical Transportation: Effects of Harmonics of Drives by PM Machines

Publicado en línea: 17 Nov 2018
Páginas: 47 - 53

Resumen

Abstract

Permanent magnet motor drive is a widely used technology, offering many advantages, such as exceptional speed, torque control and greater flexibility. Improvement of reliability and efficiency has become a great research interest. Towards this direction and taking into account the major developments in permanent machine technology over the recent years, the use of energy recovery converters has been introduced in various industrial applications. In this paper, the effects of harmonics on a three-phase motor controlled by a drive are analysed, and the behaviours of the filter topology after adopting regenerative drives are studied. The main contribution of this study is a methodology to foresee the standards that can be achieved with the use of an active front end system topology with filters. Moreover, the use of an optimum filter that eases the power system distortion is presented. The analysis presented in this paper is validated experimentally.

Palabras clave

  • Elevators
  • Permanent magnet synchronous machine
  • Adjustable speed drive
  • Quality
  • Safety
  • Reliability
  • Robustness
Acceso abierto

Extended T-type Inverter

Publicado en línea: 17 Nov 2018
Páginas: 55 - 64

Resumen

Abstract

This paper presents a new concept for a power electronic converter - the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide-semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.

Palabras clave

  • Multilevel inverter
  • T-type inverter
  • Boost converter
  • Silicon carbide
Acceso abierto

Novel Converter for Voltage Balance in Series-Connected Capacitors and Batteries

Publicado en línea: 17 Nov 2018
Páginas: 65 - 74

Resumen

Abstract

This paper presents a novel concept of a circuit for voltage balance of three series-connected capacitors or batteries, as well as the research results. The problem is related to the control of voltage sharing on series capacitors, supercapacitors or battery banks in energy storage systems or direct current (DC)-link of four-level neutral-point-clamped inverters. The proposed circuit is a switched-capacitor (SC) resonant converter composed of a single capacitor and seven transistor switches. Control of the converter makes it possible to transfer energy between any capacitors, by switching selected transistors. This paper presents the basic concept of the converter, an analysis of control strategies and the simulation results for various cases of voltage balancing.

Palabras clave

  • Capacitor voltage balance
  • Multilevel converter
  • NPC four-level inverter
  • Voltage sharing
  • Supercapacitor
  • Battery
Acceso abierto

A Cost-Effective Resonant Switched-Capacitor DC-DC Boost Converter – Experimental Results and Feasibility Model

Publicado en línea: 17 Nov 2018
Páginas: 75 - 83

Resumen

Abstract

This paper presents the results of experimental research of a resonant switched capacitor voltage multiplier in a cost-effective topology (CESCVM) with a limited number of active switches. In the charging mode of the switched capacitors, the converter utilizes only one active switch and a required number of diodes. Therefore, the cost of the converter is decreased as compared with that of a classical SCVM converter, owing to a lower number of switches and gate driver circuits, as well as a smaller PCB area. Moreover, the CESCVM has simpler control circuits and higher reliability. This paper presents the original experimental results of the operation of the CESCVM converter. A concept of the bootstrap supply of gate drivers of the flying switches is also examined.

Palabras clave

  • DC-DC converter
  • switched-capacitors
  • voltage multiplier
  • charge pump
  • ZCS
Acceso abierto

Performance and Stability Analysis of Series-Cascaded, High-Gain, Interleaved Boost Converter for Photovoltaic Applications

Publicado en línea: 17 Nov 2018
Páginas: 85 - 97

Resumen

Abstract

Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.

Palabras clave

  • series cascade
  • interleaved boost converter
  • high gain
  • stability
  • fast Fourier transform
Acceso abierto

Space Vector Pulse Width Modulation for High-Speed Induction Motor Implemented in Nios II Softcore Processor

Publicado en línea: 17 Nov 2018
Páginas: 99 - 107

Resumen

Abstract

The purpose of the article was to present the idea of space vector pulse width modulation (SVPWM) and implementation in Nios II softcore processor. The SVPWM module was described in a classical method in hardware description language both as an independent structure and as an additional component to softcore processor. The available methods were compared, and the experiment was carried out in the laboratory to test implemented SVPWM algorithm using high-speed induction motor.

Palabras clave

  • Induction motor
  • FPGA
  • Softcore processor

Special Section on Sensorless Drives

Acceso abierto

Introduction to the Special Section on State and Parameter Estimation Methods for Sensorless Drives

Publicado en línea: 17 Nov 2018
Páginas: 111 - 113

Resumen

Abstract

This short article constitutes an introductory part of the Special Section (SS) on State and Parameter Estimation Methods in Sensorless Drives. In the current issue of the journal, the first part of this section is published. Accepted articles are focussed mainly on estimation of the state variables and parameters for vector-controlled induction motor (IM) drives, using different concepts, such as different types of Kalman filters (KFs) and model reference adaptive systems (MRASs). The KF was also proposed for brushless DC motor (BLDC). Also, neural networks (NNs) have been proposed for mechanical state variables’ estimation of the drive system with elastic couplings.

Palabras clave

  • sensorless control
  • extended Kalman filter
  • unscented Kalman filter
  • MRAS estimators
  • neural networks
Acceso abierto

Extended Kalman Filter Based Speed-Sensorless Load Torque and Inertia Estimations with Observability Analysis for Induction Motors

Publicado en línea: 17 Nov 2018
Páginas: 115 - 127

Resumen

Abstract

This paper aims to introduce a novel extended Kalman filter (EKF) based estimator including observability analysis to the literature associated with the high performance speed-sensorless control of induction motors (IMs). The proposed estimator simultaneously performs the estimations of stator stationary axis components of stator currents and rotor fluxes, rotor mechanical speed, load torque including the viscous friction term, and reciprocal of total inertia by using measured stator phase currents and voltages. The inertia estimation is done since it varies with the load coupled to the shaft and affects the performance of speed estimation especially when the rotor speed changes. In this context, the estimations of all mechanical state and parameters besides flux estimation required for high performance control methods are performed together. The performance of the proposed estimator is tested by simulation and real-time experiments under challenging variations in load torque and velocity references; and in both transient and steady states, the quite satisfactory estimation performance is achieved.

Palabras clave

  • Extended Kalman filter
  • Induction motor
  • Load torque and inertia estimation
  • Speed-sensorless control
  • Observability analysis
Acceso abierto

Dynamic Performance of Estimator-based Speed Sensorless Control of Induction Machines Using Extended and Unscented Kalman Filters

Publicado en línea: 17 Nov 2018
Páginas: 129 - 144

Resumen

Abstract

This paper presents an estimator-based speed sensorless field-oriented control (FOC) method for induction machines, where the state estimator is based on a self-contained, non-linear model. This model characterises both the electrical and the mechanical behaviours of the machine and describes them with seven state variables. The state variables are estimated from the measured stator currents and from the known stator voltages by using an estimator algorithm. An important aspect is that one of the state variables is the load torque and, hence, it is also estimated by the estimator. Using this feature, the applied estimator-based speed sensorless control algorithm may be operated adequately besides varying load torque. In this work, two different variants of the control algorithm are developed based on the extended and the unscented Kalman filters (EKF, UKF) as state estimators. The dynamic performance of these variants is tested and compared using experiments and simulations. Results show that the variants have comparable performance in general, but the UKF-based control provides better performance if a stochastically varying load disturbance is present.

Palabras clave

  • Induction machine
  • speed sensorless control
  • field-oriented control (FOC)
  • non-linear state estimation
  • load torque estimation
  • extended Kalman filter (EKF)
  • unscented Kalman filter (UKF)
Acceso abierto

Simulation Analysis of Extended Kalman Filter Applied for Estimating Position and Speed of a Brushless DC Motor

Publicado en línea: 17 Nov 2018
Páginas: 145 - 155

Resumen

Abstract

The purpose of this paper was to present a method for the estimation of the rotor speed and position of brushless DC (BLDC) motor. The BLDC motor state equations were developed, and the model was discretised. Extended Kalman filter has been designed to observe specific states from the state vector, needed for the sensorless control (rotor position) and to determine the speed, which may be useful to use as a feedback for the controller. A test was carried out to determine the noise covariance matrices in a simulation manner.

Palabras clave

  • extended Kalman filter
  • brushless DC motor
  • covariance matrix
  • sensorless control for BLDC
Acceso abierto

Universal Speed and Flux Estimator for Induction Motor

Publicado en línea: 17 Nov 2018
Páginas: 157 - 169

Resumen

Abstract

In the paper, the concept of universal speed and flux estimator with additional parameters estimators is presented. Proposed solution is based on the Model Reference Adaptive System (MRAS) type flux and speed estimator and can be used in different industrial systems (especially in the automotive applications). Induction Motor (IM) parameters are estimated using the systems based only on simple simulators and adaptive systems (voltage model and current model). Proposed system was tested in the sensorless induction motor drive with the Direct Field Oriented Control (DFOC) algorithm. Simulation and experimental results are presented in the paper.

Palabras clave

  • Speed estimator
  • rotor flux estimator
  • parameter estimator
  • induction motor
  • MRAS
  • universal estimator
  • vector control
Acceso abierto

Comparative Stability Analysis of Stator Current Error-based Estimators of Induction Motor Speed

Publicado en línea: 17 Nov 2018
Páginas: 187 - 203

Resumen

Abstract

This paper deals with the stability problem of three stator current error-based estimators of induction motor speed, especially in the regenerating operation mode. The stability of the adaptive full-order observer (AFO) and two model reference adaptive systems (MRASs) based on a stator current error (MRASCCand MRASCV) is briefly analysed, and the stability borders are determined and compared. It is shown that MRASCVspeed estimator is stable in the whole operation range including the regenerating mode without any modifications. The stability enhancement method for AFO and MRASCCestimators is described, and the solution for their stability improvement is proposed. Torque-speed characteristics of the analysed MRAStype estimators in a wide range of drive speed and load torque changes are given, as well as the behaviour of estimators during transients is compared. The theoretical analysis and simulation test results are validated by experimental tests.

Palabras clave

  • induction motor
  • MRAS-type estimators
  • stability
  • regenerating mode
Acceso abierto

Neural State Estimator for Complex Mechanical Part of Electrical Drive: Neural Network Size and Performance of State Estimation

Publicado en línea: 17 Nov 2018
Páginas: 205 - 216

Resumen

Abstract

This paper presents the results of simulation research of an off-line-trained, feedforward neural-network-based state estimator. The investigated system is the mechanical part of an electrical drive characterised by elastic coupling with a working machine, modelled as a dual-mass system. The aim of the research was to find a set of neural network structures giving useful and repeatable results of the estimation. The mechanical resonance frequency of the system has been adopted at the level of 9.3-10.3 Hz. The selected state variables of the mechanical system are load, speed and stiffness torque of the shaft.

Palabras clave

  • two-mass drive
  • neural network
  • simulation studies
  • non-linear state estimation

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