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1

Performance improvement usig three-level neutral point clamped statcom performances using robust controllers

Flitti Mohamed, Mendez Kheira, Khatir Mohamed, Bousmaha Hanan

Przegląd Elektrotechniczny

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2022

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R. 98, nr 12

167--172

EN

This paper deals with multilevel Neutral Point Clamped (NPC) inverter applied as STATCOM. The proposed control with Space Vector Modulation (SVPWM) switching and decoupled current control with (IP) controllers have been tested to prove the advantages of the proposed control. In order to ensure fast and stable voltage regulation, reduced switching Losses and minimizing harmonic voltage under all operating conditions, we focused in this study on design and implantation of sliding mode controller for Statcom. The simulation has shown the improved performance of the proposed controller with effectiveness and efficiency results compared with the conventional IP controller.

PL

Artykuł dotyczy wielopoziomowego falownika z zaciskiem punktu neutralnego (NPC) stosowanego jako STATCOM. Proponowane sterowanie z przełączaniem modulacji wektora przestrzennego (SVPWM) i sterowanie prądem odsprzężonym za pomocą sterowników (IP) zostało przetestowane w celu udowodnienia zalet proponowanego sterowania. W celu zapewnienia szybkiej i stabilnej regulacji napięcia, zmniejszenia strat przełączania i zminimalizowania napięcia harmonicznych we wszystkich warunkach pracy, skupiliśmy się w tym badaniu na projektowaniu i wdrożeniu regulatora trybu ślizgowego dla Statcom. Symulacja wykazała lepszą wydajność proponowanego sterownika z wynikami skuteczności i wydajności w porównaniu z konwencjonalnym sterownikiem IP.

2

Integer factor based SVPWM approach for multilevel inverters with continuous and discontinuous switching sequences

Suresh Kumar Anisetty, Sri Gowri Kolli, Nagaraja Rao Sulake, Manjunatha Budagavi Matam, Sesi Kiran Ponnapati, Niteesh Kumar K.

Archives of Electrical Engineering

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2021

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Vol. 70, nr 4

859--872

EN

The most extensively employed strategy to control the AC output of power electronic inverters is the pulse width modulation (PWM) strategy. Since three decades modulation hypothesis continues to draw considerable attention and interest of researchers with the aim to reduce harmonic distortion and increased output magnitude for a given switching frequency. Among different PWM techniques space vector modulation (SVM) is very popular. However, as the number of output levels of the multilevel inverter (MLI) increases, the implementation of SVM becomes more difficult, because as the number of levels increases the total number of switches in the inverter increases which will increase the total number of switching states, which will result in increased computational complexity and increased storage requirements of switching states and switching pulse durations. The present work aims at reducing the complexity of implementing the space vector pulse width modulation (SVPWM) technique in multilevel inverters by using a generalized integer factor approach (IFA). The performance of the IFA is tested on a three-level inverter-fed induction motor for conventional PWM (CPWM) which is a continuous SVPWM method employing a 0127 sequence and discontinuous PWM (DPWM) methods viz, DPWMMIN using 012 sequences and DPWMMAX using a 721 sequence.

3

Predictive-SVM control method dedicated to an AC/DC converter with an LCL grid filter

Dmitruk K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2020

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Vol. 68, nr 5

1049--1056

EN

This paper presents simulation and laboratory test results of an implementation of an infinite control set model predictive control into a three-phase AC/DC converter. The connection between the converter and electric grid is made through an LCL filter, which is characterized by a better reduction of grid current distortions and smaller (cheaper) components in comparison to an L-type filter. On the other hand, this type of filter can cause strong resonance at specific current harmonics, which is efficiently suppressed by the control strategy focusing on the strict control input filter capacitors voltage vector. The presented method links the benefits of using linear control methods based on a space vector modulator and the nonlinear ones, which result in excellent control performance in a steady state as well as in a transient state.

4

Analysis of Direct Torque Control with Space Vector Modulation for Synchronous Reluctance Motor Motion Control Applications and a Comparison with Other Torque-Control Algorithms

Vajsz Tibor, Számel László, Handler Árpád

Power Electronics and Drives

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2019

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Vol. 4 (39)

103--113

EN

Motion control is facing an increasing popularity in the present research activities. Owing to the expected wide spreading of motion control applications, it can be predicted that the advancements in the field of electric motor drives will have a high level of influence on the new results in the field of motion control. The synchronous reluctance motor drives mean an excellent and yet cost-effective solution for actuators in motion control applications. In this article, the direct torque control with space vector modulation is analysed as a possible candidate for synchronous reluctance motor motion control applications. Its torque-control performance is investigated as a function of torque-control sample time, and a comparison of the torque ripples is made with other torque-control algorithms by an FFT analysis.

5

Wektorowa modulacja szerokości impulsów w wielofazowych falownikach napięcia

Lewicki A., Strankowski P., Morawiec M., Guziński J.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 5

112--119

PL

W artykule zaproponowano strategię wektorowej modulacji szerokości impulsów dla wielofazowych falowników napięcia. Zaproponowane rozwiązanie pozwala na niezależne formowanie napięć wyjściowych w n-fazowym falowniku dwupoziomowym z wykorzystaniem (n-1) wektorów aktywnych. Przedstawiony algorytm modulacji umożliwia dobór sekwencji wektorów aktywnych i pasywnych wymagającej minimalnej liczby przełączeń tranzystorów falownika. W artykule przedstawiono wyniki badań napędu elektrycznego z silnikiem klatkowym zasilanym z pięciofazowego falownika napięcia, w którym zaimplementowano zaproponowane rozwiązanie.

EN

This paper presents the Space Vector Modulation for multiphase Voltage Source Inverters (VSI). Proposed solution makes it possible to generate the inverter output voltage vectors in n-phase VSI using (n-1) active voltage vectors. The presented algorithm allows to select the active and zero voltage vector sequence where the commutation amount is limited. The results of investigation of the drive system with induction motor and five-phase VSI controlled using proposed modulation strategy are presented in the paper.

6

A method of reducing switch count in three-level NPC inverter – analysis in steady states

Beniak R., Rogowski K.

Power Electronics and Drives

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2017

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Vol. 2 (37), No. 2

117--126

EN

The proof of a concept for a new method of modulation has been presented which reduce switch count in a three-level neutral point clamped (3L-NPC) inverter. The method is an implementation of space vector modulation (SVM) by means of a prediction algorithm and sequences of transistors, which are not common in use. Those sequences make active use of clamping diodes of the inverter. The prediction algorithm analyzes possible sequences of transistors’ states and choose those which offers smaller switch count. Measurements of steady states were taken on prototype 3L-NPC.

7

Direct Torque Control of multi-phase induction motor with fuzzy logic speed controller

Listwan J.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2017

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T. 7, nr 4

38--43

EN

The paper presents the Direct Torque Control with Space Vector Modulation (DTC-SVM) of seven-phase induction motor with Fuzzy Logic Speed Controller. The mathematical model of the seven-phase squirrel-cage induction motor and chosen methods of Space Vector Modulation have been presented. Simulation studies of the DTC-SVM with Fuzzy Logic speed controller have been carried out and the results of simulation studies have been presented and discussed. The author original contribution includes analysis and studies of considered control method of seven-phase induction motor.

PL

W artykule przedstawiono metodę bezpośredniego sterowania momentem siedmiofazowego silnika indukcyjnego z zastosowaniem metod modulacji wektorowej i rozmytego regulatora prędkości. Przedstawiono model matematyczny siedmiofazowego silnika indukcyjnego klatkowego oraz wybrane metody modulacji wektorowej. Przeprowadzono badania symulacyjne sterowania silnikiem z zastosowaniem metody DTC-SVM i rozmytego regulatora prędkości. Przedstawiono i omówiono wyniki badań symulacyjnych. Oryginalny wkład autora dotyczy analizy i badań przedstawionej metody sterowania silnikiem siedmiofazowym.

8

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

Tomasov V., Usoltsev A., Zolov P., Gribanov P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 5

629--637

EN

The effect of space vector modulation algorithm on magnitude of current vector ripples was considered on the mathematical model of a three-level three-phase voltage inverter with symmetric active inductive load. Limitations on the use of such inverters as a power supply for precision drive of optical telescopes were specified.

9

Space-vector pulsewidth modulation for a seven-level cascaded H-bridge inverter with the control of DC-link voltages

Lewicki A., Morawiec M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 5

619--628

EN

A control strategy of DC-link voltages for a seven-level cascaded H-bridge inverter is proposed in this paper. The DC-link voltage balancing is accomplished by an appropriate selection of H-bridges and control of their duty cycles in space-vector modulation (SVM) algorithm. The proposed SVM method allows to maintain the same voltage level on all inverter capacitors. Regardless of the balancing function, the SVM strategy makes it possible to generate the output voltage vector properly also in the case where the DC-link voltages are not balanced. The results of simulation and experimental investigations are presented in the paper.

10

A method of reducing switching losses in three-level NPC inverter

Beniak R., Rogowski K.

Power Electronics and Drives

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2016

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Vol. 1 (36), No. 2

55--63

EN

The aim of the paper is to present a concept of implementation of a space vector modulation (SVM) algorithm, which is used to create alternating current waveforms of changing amplitude and frequency in power inverters. The main goal of the method is to decrease the number of state changes in power transistors. It is realized by utilizing a prediction algorithm and sequences of transistors, which are not common in use. The method requires measurement of inverter output current flow. The prediction algorithm analyzes possible sequences of transistors’ states and choose those which offers smaller switch count. A decrease of about 20% was obtained for the cases tested. This paper presents simulation result for selected driving scenario. The described method decreases the number of state changes in power transistors and therefore it is a potentially good method to considerably decrease energy losses of multilevel inverter-powered drive.

11

High performances of grid-connected DFIG based on direct power control with fixed switching frequency via MPPT strategy using MRAC and neuro-fuzzy control

Amrane F., Chaiba A., Mekhilef S.

Journal of Power Technologies

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2016

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Vol. 96, nr 1

27--39

EN

This paper presents high performance improved direct power control (DPC) based on model reference adaptive control (MRAC) and neuro-fuzzy control (NFC) for grid connected doubly fed induction generator (DFIG), to overcome the drawbacks of conventional DPC which was based only on PID controllers, namely the speed/efficiency trade-off and divergence from peak power under fast variation of wind speed. A mathematical model of DFIG implemented in the d-q reference frame is achieved. Then, a direct power control algorithm for controlling rotor currents of DFIG is incorporated using PID controllers, and space-vector modulation (SVM) is used to determine a fixed switching frequency. The condition of the stator side power factor is controlled at unity level via MPPT strategy. The MRAC which is based on DPC is investigated instead of PID regulators. Also, the performances of NFC based on DPC are tested and compared to those achieved using MRAC controller. The results obtained in the Matlab/Simulink environment using robustness tests show that the NFC is efficient, has superior dynamic performance and is more robust during parameter variations.

12

Przemienniki częstotliwości bez magazynu energii prądu stałego z przekształtnikiem matrycowym zasilanym ze źródła prądowego

Szcześniak P.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 8

158--161

PL

W artykule zostały omówione układy przemienników częstotliwości bez magazynu energii prądu stałego, z przekształtnikiem matrycowym, który jest zasilany ze źródła prądowego. Omówione zostały zależności napięciowe, w postaci charakterystyk wzmocnienia napięciowego, dla układów: przekształtnika matrycowego prądu, matrycowo-reaktancyjnych przemienników częstotliwości typu buck-boost II i boost.

EN

In this article the frequency converters without DC energy storage and with the matrix converter fed by a current source are discussed. The voltage relations in the form of static characteristics of voltage gain are presented for three converters: current source matrix converter, matrixreactance frequency converter with buck-boost II and boost topology.

13

Prostownik matrycowy sterowany według nowej metody modulacji szerokości impulsów

Rząsa J.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 4

115--122

PL

Artykuł prezentuje nową metodę modulacji szerokości impulsów w sterowaniu prostownikiem matrycowym. Metoda pozwala na czterokwadrantową pracę układu oraz regulację przesunięcia fazowego prądu i napięcia na wejściu. Dla porównania artykuł zawiera także omówienie modulacji z trapezowym sygnałem modulującym i prezentację dwóch wariantów modulacji wektorowej.

EN

The article presents the new PWM method used in control of matrix rectifier. The method allows to four-quadrant work of converter and control of input displacement angle. For comparison, the modulation with trapezoidal modulation function and two versions of space vector modulation method are presented.

14

An improved space vector modulation strategy for common-mode voltage reduction in matrix rectifier

Liu X., Zhang Q., Hou D.

Archives of Electrical Engineering

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2014

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Vol. 63, nr 1

93-106

EN

The matrix rectifier modulated by the classical space vector modulation (SVM) strategy generates common-mode voltage (CMV). The high magnitude and high du/dt of the CMV causes serious problems such as motor damage, electromagnetic noise and many others. In this paper, an improved SVM strategy is proposed by replacing the zero vectors with suitable couple of active ones that substantially eliminate the CMV. Theoretical analysis proves that the proposed strategy can reduce the amplitude of the CMV to half of the original value. In addition, the quality of the input and output waveforms is not affected by extra active vectors. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed strategy are shown.

15

Dynamic Model of a Space Vector Modulated Buck-Boost Matrix-Reactance Frequency Converter

Szcześniak P., Fedyczak Z., Kaniewski J.

Przegląd Elektrotechniczny

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2013

|

R. 89, nr 12

86-89

EN

The determination of the converter passive elements for various load and power grid conditions is of great importance to the proper operation of matrix-reactance frequency converters. This paper presents a novel dynamic model of a Matrix-Reactance Frequency Converter that utilizes a Space Vector Modulation (SVM) switching method. In this paper the average-state space method and the two-frequency d-q transformation are proposed as aids in the process of fast verification of the matrix-reactance frequency converter operation under specific dynamic conditions.

PL

Elementy pasywne w układzie Matrycowo-Reaktancyjnego Przemiennika Częstotliwości mają duży wpływ na jego parametry przy zmiennych wartościach zasilania lub obciążenia. Artykuł ten przedstawia dynamiczny model matematyczny Matrycowo-Reaktancyjnego Przemiennika Częstotliwości przy modulacji wektora przestrzennego napięcia wyjściowego (SVM). Metoda uśrednionych zmiennych stanu oraz dwuczęstotliwościowe przekształcenie d-q jest wykorzystane do opisu właściwości przekształtnika przy dynamicznych zmianach jego parametrów.

16

Wektorowa technika modulacji ograniczająca napięcie zaburzeń wspólnych w trójpoziomowym falowniku napięcia

Leżyński P., Kempski A., Smoleński R.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 4b

146-150

PL

W artykule zaprezentowano wektorową technikę modulacji, która przyczynia się do ograniczania napięcia zaburzeń wspólnych w trójpoziomowych falownikach napięcia o topologii kaskadowej. W związku z dużą liczbą dostępnych stanów dla falowników wielopoziomowych sterowanie przy pomocy klasycznych technik wektorowych może być skomplikowane. Proponowana technika modulacji charakteryzuje się dużą prostotą przy implementacji, z uwagi na możliwość zastosowania dostępnych modulatorów wektorowych.

EN

In the paper a low common mode voltage vector modulation technique for the three-level cascaded voltage source inverter is presented. The large number of available states for multilevel inverters can make implementation vector control strategies complicated. The proposed modulation technique is simple to implement due to ability to use available vector modulators.

17

A Multi-Level Inverter for Ultra High Speed PM Motor Control Application

Xu L., Li Y., Zheng Z., Ma H., Wang K.

Przegląd Elektrotechniczny

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2012

|

R. 88, nr 5b

11-16

EN

The general concepts of multi-level technology involve utilizing a higher number of semiconductor devices to achieve higher power conversion, eliminate harmonics and reduce the switching loss. This paper is concerned with applying multi-level techniques to a PM motor to achieve ultra high speed features with better quality waveforms and less dv/dt for an aerospace application. A three-level diode clamped inverter is used to control a low inductance, ultra high speed PM motor with an integrated designed load compressor. Results from a 15kW experimental prototype are presented to validate the reliability of the inverter, the stability of the DC-link voltage balance and the practicality of vector control in this application.

PL

W artykule opisano zastosowanie wielopoziomowego przekształtnika do sterowania silnikiem z magnesami trwałymi. Osiągnięto bardzo dobra jakość kształtu sygnału napięciowego I małe dV/dt. Dzięki temu uzyskano ultra duża szybkość do zastosowań lotniczych

18

Multi-input multi-output fuzzy logic controller for utility electric vehicle

Gasbaoui B., Abdelkader Ch., Adellah L.

Archives of Electrical Engineering

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2011

|

Vol. 60, nr 3

239-256

EN

Currently commercialization of electric vehicle (EV) is based to minimize the time of starting and acceleration. To undergo this problem multi-input multi-output fuzzy logic controller (MIMO-FLC) affect on propelled traction system forming MMS process was proposed. This paper introduces a MIMO-FLC applied on speeds of electric vehicle, the electric drive consists of two directing wheels and two rear propulsion wheels equipped with two light weight induction motors. The EV is powered by two motors of 37 kilowatts each one, delivering a 476 Nm total torque. Its high torque (476Nm) is instantly available to ensure responsive acceleration performance in built-up areas. Acceleration and steering are ensured by an electronic differential system which maintains robust control for all cases of vehicle behavior on the road. It also allows controlling independently every driving wheel to turn at different speeds in any curve. Direct torque control based on space vector modulation (DTC-SVM) is proposed to achieve the tow rear driving wheel control. The MIMO-FLC control technique is simulated in MATLAB SIMULINK environment. The simulation results have proved that the MIMO-FLC method decreases the transient oscillations and assure efficiency comportment in all type of road constraints, straight, slope, descent and curved road compared to the single input single output fuzzy controller (SISO-FLC).

19

A simple wide range space vector PWM controller algorithm for voltage-fed inverter induction motor drive including six-step mode

Nguyen Thac K.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

|

2010

|

Vol. 64, nr 30

266-277

EN

In this paper a simple algorithm of space vector pulse width modulation (SVM) for two-level voltage-fed inverter is proposed. The idea of algorithm is that a single algorithm covers the undermodulation and overmodulation range including six-step mode. The algorithm unifies equations to determine angle of reference voltage vector Uc in undermodulation and overmodulation mode I, therefore simplifies calculation program. The open loop control of the induction motor, a smooth operation during transition from the linear control to the six-step mode is demonstrated through experimental results using Matlab/Simulink simulation.

20

Backstepping/DTC control of a double star synchronous machine drive

Boudana D., Nezli L., Tlemcani A., Mahmoudi M. O., Djemai M., Tadjine M.

Archives of Control Sciences

|

2010

|

Vol. 20, no. 2

227-247

EN

Direct torque control (DTC) allows for very high quality torque control without a need for current controllers tuning or using coordinate transformation. However, barge torque ripples arise as well as inconstant inverter switching frequency due to the hysteresis of comparators. This paper present a backstepping/DTC control based on the space vector modulation (SVPWM) for double star synchronous machine (DSSM) to reduce the torque, flux, current and speed pulsations during steady state. By the coordinate transformation the DSSM models are presented in view of control. Then a conventional DTC is developed to get a decoupled system and a PI controller is designed to control the speed. To improve the static and dynamic control performance of the DSSM, the speed controller is designed using a backstepping/DTC procedure in conjunction with SVPWM. Simulation results with the conventional DTC and proposed backstepping/DTC are presented and compared. Results show the effectiveness and the robustness of the approach proposed.