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High performance interior permanent magnet synchronous machines show nonlinear magnetics due to saturation and cross-coupling. Nonlinear differential equations describe these phenomena and make feedback control challenging. This paper presents a predictive control method to precisely control the dynamics of these machines. Four real-time capable strategies to online identify transient trajectories...
Computer aided design tools are nowadays important for a variety of engineering fields. One of the most used tool is MATLAB/Simulink®, which has a broad variety of libraries and is recognized by its reliability. This paper presents a toolbox library for simulation and prototyping of control techniques for three and five phase induction machines, developed in MATLAB/Simulink®and to be used with dSPACE®DS-1104...
This paper analyses the detuning effects of machine electrical parameters on the performance of unified direct flux vector control (UDFVC) of induction motor drives. Drive self-commissioning is discussed as a way to estimate parameters for better control performance and accurate torque estimation. The potential of the unification of direct flux and current vector control has been recognized for both...
This paper proposes the use of a 3-level Cascaded H-Bridge Multilevel Inverter (CHMI) topology which results in further torque ripple minimization compared to the 2-level inverter-based Direct Torque Control (DTC). This is due to the increase in the inverter switching voltage vectors that allows minimization of the torque error. This in turn can reduce the Total Harmonic Distortion (THD) of the output...
With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in naval applications. Excellent torque dynamics are important in these applications - they allow meeting additional demands due to electrical system stability. Dynamics are limited by the rating and the switching frequency of the converter...
Dual motor drives fed by single inverter are purposely designed to reduced sizes and cost with respect to single motor drives fed by single inverter. This paper presents the speed responses behavior of Dual Permanent Magnet Synchronous Motor (PMSM) driven base on two different PWM control schemes, which are Space Vector Pulse Width Modulation (SVPWM) and Hysteresis Current Controller. These two techniques...
The main objective of this paper is to control the speed of an induction motor by using seven level diode clamped multilevel inverter. To obtain high quality sinusoidal output voltage with reduced harmonics. The proposed Scheme for diode clamped multilevel inverter is multicarrier SPWM control. An open loop speed control can be achieved by using V/f method. This method can be implemented by changing...
High speed maglev maintenance vehicle (MMV) is propelled by multiple in-wheel-induction-motors drive system (IWIM). This paper analyses the characteristics of multiple IWIM drive system for MMV. An electromechanical simulation platform is developed in our Lab. Adaptive flux observer is applied to provide speed sensor-less vector control for multiple IWIM drive system. The influences of different wheel...
The computer simulation is a powerful tool for assessment of the SVM (Space-Vector-Modulation) strategy and inverter. The methods to building the simulation model for them are analyzed, and a new modeling method is proposed and discussed. The new method models the SVM and inverter as a whole based on the start point of the SVM. The method to computing the DC link current is given based on the three-phase...
The configuration of a single-phase AC-DC converter plus a three-phase DC-AC inverter traction system has been widely applied in high speed railway electrical drive systems. If the LC filter is not adopted in the DC-link, the DC-link voltage fluctuation may beat with the motor electric frequency, which could cause an increase in power loss, torque pulsation and audible noise. This paper aims to reduce...
Power Factor Correction (PFC) is used in power systems operating from single phase AC to correct for the non linearity of the rectifier. Use of PFC in motor drives is increasing because of increased regulation from the power utility side. However, integration of PFC and field oriented control of motor on a single controller remains challenging from a processor bandwidth point of view while keeping...
Voltage source inverter (VSI) fed induction motors are widely used in variable speed applications. Space Vector Pulse Width Modulation (SVPWM) has become the successful techniques to construct three phase sine wave Voltage Source Inverter (VSI) parallel to control three-phase induction motor using v/f control. Because of the low maintenance and robustness induction motors have many applications in...
In this paper a high performance Direct Torque Control (DTC) theme for the induction motor fed by indirect matrix converter is proposed and investigated. Since the indirect matrix converter has an intermediate dc link, the control process can be separated into rectifier stage modulation and inverter stage modulation. Indirect space vector modulation (ISVM) for input current is applied on the rectifier...
This paper presents a high performance Direct Torque Control (DTC) theme for the induction motor using Indirect Matrix Converter (IMC). To improve the dynamic behavior of motor, Active Learning Method (ALM) is implemented on the DTC. The ALM uses its own modeling technique called the ink drop spread (IDS) method. Functionally the IMC is very similar to the Direct Matrix Converter (DMC) but it has...
In this paper a sensorless Predictive Torque Control (PTC) is proposed. The reduced order observer is used for stator flux estimation. The prediction model and also the reduced order observer are reinforced by a proposed PI offset compensation scheme for accurate flux and torque prediction and also estimation without the need for speed sensor. Cost function base predictive control is exploited. Method...
In this paper two methods of torque control for induction motor have been investigated. First DTC method is implemented by using PI regulators and three-level inverter. Then an improved predictive torque control is developed and performed with two-level inverter. In the proposed predictive control the next torque and flux are predicted by discrete model of motor and inverter. Afterward the feasible...
This paper presents an efficient implementation scheme for the closed-loop voltage control of an induction motor incorporating `Space Vector Pulse Width Modulation (SVPWM)'. Voltage control is required to meet the variation in the input voltage and to regulate the output of the inverter. Space Vector Modulation (SVM) is an algorithm for the control of Pulse Width Modulation (PWM). SVM gives better...
This paper presents a novel inverter named nine switch inverter for independent control of two AC motors. The inverter has nine switching devices. The proposed inverter is composed of two conventional inverters with three common switches. A nine switch inverter can achieve the independent control of two ac motors by controlling the MI of the inverters. The simulation model of the inverter is developed...
Modeling, simulation and implementation of Voltage Source Inverter (VSI) fed closed loop control of 3-phase induction motor drive is presented in this paper. A mathematical model of the drive system is developed and is used for the simulation study. Simulation is carried out using Scilab/Scicos, which is free and open source software. The above said drive system is implemented in laboratory using...
Development in multilevel converters has provided better option as power converter for high-power applications. These converters synthesize the output voltage waveform from several steps of dc input source which approaches to sinusoidal waveform and minimizes the harmonic distortions. This paper presents the application of two-level inverter and diode clamped multilevel inverter for direct torque...
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