Simulation studies of three synchronous reluctance motor (SynRM) control strategies are presented: field-oriented control (FOC), direct torque control (DTC), and finite-set model-predictive control (FS-MPC). FOC uses linear controllers and pulse-width modulation to control the fundamental components of the load voltages vectors. In contrast, DTC and FS-MPC are nonlinear strategies wherein the voltage vectors are directly generated in the absence of a modulator. Theoretical operating principles and control structures of these control strategies are presented. Moreover, a comparative analysis of the static and dynamic performance of the control strategies is conducted using Matlab/Simulink to identify their advantages and limitations. It is confirmed that each of the control strategies has merits and that all three of them satisfy the requirements of modern high-performance drives. 

/pdf/performance-comparison-of-field-oriented-control-direct-1qmc9msy.pdf

Performance Comparison of Field-oriented Control, Direct Torque Control, and Model-predictive Control for SynRMs

This article studies a dual inverter supplied by a dc-link and a floating capacitor (FC), emerged as a promising inverter topology for motor drive applications. For this type of inverter, the voltage ratio between the dc-link and the FC can be actively controlled. This ratio design is crucial as it essentially defines both the dc-link voltage utilization and the inverter output quality. Several voltage ratios have previously been discussed to enhance the dual inverter performance, but only one aspect, either the voltage utilization or the output quality, is investigated. As a result, although one performance aspect can be improved, the other aspect has been adversely affected. In this article, a comparative study considering both aspects is carried out for all the possible voltage ratios. Based on this analysis, the optimal ratios for different inverter modulation indices are identified. This is followed by proposing a ratio selection strategy to double the voltage utilization without degrading the output quality. This strategy enables an electric drive to work at a higher maximum speed without flux weakening for a given dc-link voltage. The claimed advantages have been proved by experimental tests on an open-end windings induction motor drive.

Enhanced Performance of Dual Inverter With a Floating Capacitor for Motor Drive Applications

Dual inverter fed induction motor drives provide more advantages in contrast with other multilevel inverter drives. Coupled PWM techniques provide good standard of output voltage than the decoupled PWM techniques for dual inverter configuration. In this paper analysis of open end winding induction motor by coupled random PWM signals and decoupled SVPWM signals was carried out. Induction motor by random PWM technique generate low acoustic noise and electromagnetic interference to near by systems. The performance evaluation of the drive wss implemented in MATLAB/simulink and the results were presented.

https://ijpeds.iaescore.com/index.php/IJPEDS/article/download/13817/10881

Coupled random PWM technique for dual inverter fed induction motor drive

/pdf/reducing-switching-losses-in-indirect-matrix-converter-163xt0huu9.pdf

Reducing Switching Losses in Indirect Matrix Converter Drives: Discontinuous PWM Method

The paper is focused on reduction and balancing of power losses in a dual inverter. The proposed technique is based on finite control set model predictive control with two techniques which improve the behavior of the basic predictive algorithm to deal with different time constants in the system. The proposed algorithm uses approximation of the power losses by an exponential filter and furthermore, it combines this approximation with extended prediction horizon. The computational burden of the prediction horizon is reduced by the switching states preselection. The behavior of the system is then significantly improved with respect to balancing of power losses among the transistors and with respect to quality of the output current.

Improved model predictive control with extended horizon for dual inverter with real-time minimization of converter power losses

Conventional space vector pulse width modulation based asymmetrical dual inverter configuration produces high common mode voltage (CMV) variations. This CMV causes the flow of common mode current, which adversely affects the motor bearings and electromagnetic interference of nearby electronic systems. In this study, a simple and generalized carrier based pulse width modulation (PWM) technique is proposed for dual inverter configuration. This simple approach generates various continuous and discontinuous modulating signals based PWM algorithms. With the application of the discontinuous modulating signal based PWM algorithm to the asymmetrical dual inverter configuration, the CMV can be reduced with a slightly improved quality of output voltage. The performance of the continuous and discontinuous modulating signals based PWM algorithms is explored through both theoretical and experimental studies. Results show that the discontinuous modulating signal based PWM algorithm efficiently reduces the CMV and switching losses.

/pdf/reduction-of-common-mode-voltage-in-asymmetrical-dual-3b513pylii.pdf

Reduction of Common Mode Voltage in Asymmetrical Dual Inverter Configuration Using Discontinuous Modulating Signal Based PWM Technique

Dual inverter fed open end winding induction motor (IM) drive offers many advantages over other multilevel inverter fed IM drives. Pulse width modulation (PWM) techniques are employed for the control of output voltage and frequency. Space vector base PWM techniques are popular among all the PWM techniques. A simplified space vector PWM method with simple and small look-up table approach is presented for dual inverter configuration. Moreover the proposed space vector based PWM technique provides freedom in selecting the center voltage vector (CVV) by which different PWM techniques will be derived. The implementation of all these PWM techniques is generalized by using a constant a
 o
. The derived PWM techniques show superior performance in reducing the zero sequence voltage (ZSV) by maintaining the same quality of output voltage. The performance of all these PWM techniques are evaluated theoretically and verified in real time through dSPACE 1104 control board.

/pdf/effect-of-center-voltage-vectors-cvvs-of-three-level-space-4d7dmvpfcc.pdf

Effect of center voltage vectors (CVVs) of three-level space plane on the performance of dual inverter fed open end winding induction motor drive

Reduced common mode voltage PWM techniques for dual inverter configuration

Common mode voltage (CMV) variations in the dual inverter fed induction motor drives causes unwanted shaft voltage and bearing currents resulting in reduced the life time. Single dc-link dual inverters topologies eliminate CMV but generate a poor quality of output voltage with circulating currents. Exploiting the new pulse pattern for the isolated dc-link dual inverter, new scalar pulse width modulation (PWM) methods are proposed in this paper using the freedom of selection reference signals and carrier signals. These scalar PWM techniques reduce CMV to maximum permissible limits with good quality of output voltage. PWM techniques proposed in this paper can also be extended to N-level inverter. To validate the proposed PWM techniques numerical studies are carried out in MATLAB/simulink environment.

Common mode voltage reduction PWM techniques for four-level open end winding induction motor drive with superior quality of output voltage

Abstract—Acoustic noise becoming ever more obnoxious radiated by voltage source inverter fed induction motor drive in modern and industrial applications. The drive utilized for industrial and modern applications should use “spread spectrum” innovation known as Random pulse width modulation (PWM) algorithms where acoustic noise emanates through the machine should be critically concerned. This paper illustrates three types of random PWM control algorithms with fixed switching frequency namely 1) Random modulating PWM 2) Random carrier PWM and 3) Random modulating-carrier PWM. The spectrum plots of the motor stator current demonstrate the strength and robustness of the proposed PWM algorithms. To affirm the proposed algorithms, experimental tests have been conducted using dSPACE rt1104 control board on a v/f control three phase induction motor drive fed by DC link cascaded multilevel inverter.

Level Shifted Carrier Signal Based Scalar Random Pulse Width Modulation Algorithms for Cascaded Multilevel Inverter Fed Induction Motor Drive

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