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1

Three Level DTC-SVM for Dual Star Induction Motor Fed by Tow Cascade VSI with DPCVF-SVM Rectifier

Sadouni Radhwane

Journal of Power Technologies

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2020

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Vol. 100, nr 2

171--177

EN

We present in this paper a novel DTC-SVM scheme for a Dual Star Induction Motor fed by two 3 levels inverter with NPC structure, this type of inverter has many points of interest in comparison with the conventional 2 levels inverter, such as: sinus wave forms of the output voltage, low THD of voltage and current and low switching frequency. Also, we present in this article an improved direct power control with virtual flux (DPCVF-SVM) for the control of three phase rectifier. It is shown that the DPC-SVM presents several advantages: constant switching frequency, good dynamic response, sinusoidal line currents etc.

2

Control of squirrel-cage electric generators in a parallel intermediate DC circuit connection

Kozak M., Gordon R., Bejger A.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2016

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nr 45 (117)

17--22

EN

The paper covers the theoretical background and tests of two asynchronous squirrel cage generators connected to voltage source inverters working in parallel. Inverters were connected in parallel by their intermediate direct current circuits by means of auctioneering diodes, and then to a DC power network. The real-time control algorithm of digital signal processor DSP and field-programmable gate array FPGA was used to achieve proper excitation of two different power machines, and to maintain high enough levels of direct current link voltage. Windings of both generators are fed by use of so-called machine side inverters. The asynchronous generator is a voltage source inverter controlled by a field-oriented control algorithm based on the current machine model. To prove robustness of the chosen algorithm, different types of load were applied while generators and inverters worked in parallel.

3

PMSM drive based on STM32F4 microcontroller

Skiwski M., Tarczewski T., Grzesiak L. M.

Poznan University of Technology Academic Journals. Electrical Engineering

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2016

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No. 87

377--387

EN

In this paper based on STM32F4 microcontroller and dedicated for permanent magnet synchronous motor (PMSM) drive is presented. Information concern structure and implementation of the program main blocks such as: modulator, speed and position calculation, communication interface are depicted. Designing process of cascade control structure with PI controllers is shown. An internal model control (IMC) was used to calculate coefficients of current controllers while the symmetric optimum criterion was applied to compute angular speed controller. Since mathematical model of the drive is non-linear, linearization and decoupling procedure as well as dead-time compensation are also included. Finally, experimental test results for PMSM with FOC control algorithm are shown.

4

Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors

Beriber D., Talha A., Boucherit M. S.

Archives of Control Sciences

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2012

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Vol. 22, no. 1

107-120

EN

Voltage source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes of studying multilevel inverters are the generation of output voltage signals with low harmonic distortion and reduction of switching frequency. An important issue of the multilevel inverter is the capacitor voltage-balancing problem. The unbalance of different DC voltage sources of multilevel neutral point clamped (NPC) voltage source inverter (VSI) constitutes the major limitation for the use of this new power converter. In this paper, we present study on the stability problem of the input DC voltages of the three-level Neutral Point Clamping (NPC) voltage source inverter (VSI). This inverter is useful for application in high voltage and high power area. In the first part, we remind the model of double stator induction motors (DSIM). Then, we develop control models of this inverter using the connection functions of the semi-conductors. We propose a Pulse Width Modulation (PWM) strategy to control this converter. The inverter is fed by constant input DC voltages. In the last part, we study the stability problem of the input DC voltages of the inverter. A cascade constituted by two three-level PWM rectifiers - two three-level NPC VSI - DSIM is discussed. The results obtained show that the input DC voltages of the inverters are not stable. To solve this problem, we propose to use a half clamping bridge. This solution is very promising in order to stabilize the input DC voltages of this converters.

5

A new closed loop speed control strategy for a vector controlled three-phase induction motor drive

Tripathi A., Dey A., Dwivedi B., Singh B., Chandra D.

Electrical Power Quality and Utilisation. Journal

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2008

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Vol. 14, iss. 1

67--72

EN

This paper presents a completely mathematical equations based model on control of torque and speed of a three-phase indirect vector controlled VSI fed cage induction motor drive that is controlled through the space vector modulated method. This enables a wide range of acceptability of the model for various values of load and for various types and ratings of induction motors. The uniqueness of the model lies in the fact that the deviations in the torque and speed on sudden application of reference step change in speed values are minimum i.e. when any sudden change in the speed reference is desired, the speed and torque waveforms reveal that the time taken in coming back to their final steady state values is very less and the motor overcomes the perturbation with negligible transients. The same is verified through the simulated results.

6

Analiza możliwości pomiarów nanotopografii

Andrałojć P.

Zeszyty Naukowe Politechniki Poznańskiej. Budowa Maszyn i Zarządzanie Produkcją

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2007

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Nr 7

5-14

PL

Rozwój technologiczny wymusza w metrologii konieczność pomiaru chropowatości o wysokościach mieszczących się w skali nano. Coraz częściej potrzebne jest uzyskanie nie tylko parametrów 2D, ale także obrazu powierzchni. W artykule przedstawiono porównanie metod pomiaru nanotopografii o największej pionowej rozdzielczości, w których wykorzystuje się takie urządzenia, jak mikroskopy sondy skanującej, interferometry i profilometry.

EN

Because of technological growth metrology is made to take measurements of surface roughness in nanometer scale and visualizing the surface nano-texture. This article is presented comparison between methods of nanotopografy with the best vertical resolution e.g. scanning probe microscopy, interferometers and Stylus profilometers.