Wyniki wyszukiwania - Biblioteka Nauki

1

Grid-Tied Neutral Point Clamped based Centralised Photovoltaic Inverter with Improved DC Link Voltage Balancing and Harmonic Minimisation Control

100%

Bhowmick S. , Mukherjee D. , Maiti S. , Chakraborty C.

Power Electronics and Drives

|

2021

|

tom Vol. 6 (41)

185--203

EN

This paper proposes an improved space vector pulse width modulation (SVPWM) based DC link voltage balancing control of a three-phase three-level neutral point clamped (NPC) centralised inverter supplying the generated power from photo voltaic (PV) array to a three-phase utility grid. Two possible schemes have been developed based on the power conversion stage between PV array and the utility grid namely, two-stage (three-level boost converter three-phase three-level NPC inverter) and single-stage (three-phase three-level NPC inverter alone). The comparison between these two schemes has been thoroughly discussed in terms of the control strategies employed, power loss analysis and efficiency. The performance of the centralised inverter under different modes of operation has been investigated by developing the required control strategies for smooth operation. Using the proposed control strategy, the centralised inverter can be operated as a static synchronous compensator (STATCOM) during night time, if needed. The power loss incurred in the power-electronic converters has been analysed for constant and also for variable ambient temperature. The effectiveness of the centralised inverter as an active filter (AF) has also been verified when a three-phase non-linear load is considered in the system.

2

Strategia wektorowej modulacji szerokości impulsów dla wielopoziomowych falowników kaskadowych

75%

Lewicki A.

Przegląd Elektrotechniczny

|

2013

|

tom R. 89, nr 6

175--185

PL

W artykule zaproponowano strategię sterowania falownikami kaskadowymi. Przedstawiono algorytm wektorowej modulacji szerokości impulsów, który może być zastosowany w falownikach o dowolnej liczbie poziomów. Zaproponowane rozwiązanie umożliwia sterowanie rozkładem napięć na kondensatorach obwodów pośredniczących. Przedstawiono wyniki badań symulacyjnych nad zaproponowaną strategią sterowania.

EN

In this paper a control strategy for multilevel cascaded - H bridge converters is presented. A Space-Vector Pulse Width Modulation strategy is proposed. Presented solution makes it possible to control the DC-link voltages. Results of simulation researches on proposed control strategy are presented in the paper.

3

Formowanie wektorów napięcia wyjściowego w 5-fazowych falownika napięcia

75%

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

Automatyka, Elektryka, Zakłócenia

|

2017

|

tom Vol. 8, Nr 1(27)

28--37

PL

W falownikach pięciofazowych załączenie wektorów aktywnych powoduje jednoczesne formowanie dwóch zależnych od siebie wektorów napięcia wyjściowego. Do sterowania pięciofazowymi silnikami indukcyjnymi wektory te muszą mieć ściśle określone długości i położenia. Niezależne formowanie dwóch wektorów napięcia o parametrach określonych w układzie sterowania silnikiem wymaga zastosowania odpowiedniej strategii modulacji szerokości impulsów (MSI). W artykule przedstawiono dwie metody formowania napięć wyjściowych w falownikach pięciofazowych. Oba rozwiązania umożliwiają niezależne formowanie dwóch wektorów napięcia przy zachowaniu priorytetu generowania napięcia pierwszej harmonicznej.

EN

In the five-phase Voltage-Source Inverters, the activation of transistors results in simultaneous generation of two, interrelated output voltage vectors. Control strategies for 5-phase induction motors require both voltage vectors generated in the inverter to have strictly specified lengths and positions. Independent generation of two voltage vectors with the parameters determined in the induction motor control system can be done by appropriate Pulse Width Modulation (PWM) strategy. This paper presents two methods of Space-Vector PWM for five-phase inverters. Both solutions allow independent generation of both voltage harmonics with a higher priority o f the first voltage harmonic.

4

Design and implementation of three-phase IPM inverter based on SVPWM for AC motor applications using dsPIC30f4011

63%

Bouanane M. , Bourahla M. , Guerouad M.

Przegląd Elektrotechniczny

|

2019

|

tom R. 95, nr 7

47--50

EN

Space Vector Pulse Width Modulation (SVPWM) algorithm has become important PWM and its widely used in the industry especially to drive a three phase IPM inverter with internal shunt resistor for AC motor applications due to it high efficiently and less harmonic distortion when compared with Sinusoidal PWM (SPWM) technique. In this paper we use a 16-bit Digital Signal Controller dspic30F4011 and IRAMY20UP60B intelligent power module inverter. In the proposed system three phase sinusoidal voltage is formed with six pulses signals generating using integrated PWM module. The experimental results are wisely studied to prove that our proposed approach and IPM inverter acquire a high performance.

PL

Algorytm modulacji szerokości impulsu przestrzennego (SVPWM) stał się ważnym PWM i jest szeroko stosowany w przemyśle, szczególnie do napędu z trójfazowym falownikiem IPM z wewnętrznym rezystorem bocznikowym w silnikach prądu przemiennego z powodu jego wysokiej wydajności i mniejszych zniekształceń harmonicznych w porównaniu z sinusoidalnym PWM (SPWM). W artykule przedstawiono zastosowanie 16-bitowego kontrolera cyfrowego dspic30F4011 i IRAMY20UP60B inteligentnego modułu mocy. W proponowanym układzie powstaje trójfazowe napięcie sinusoidalne z sześcioma sygnałami impulsów generowane za pomocą zintegrowanego modułu PWM.

5

Comparison of three different 2-D space vector PWM algorithms and their FPGA implementations

51%

Bishuang F. , Guanzheng T. , Shaosheng F.

Journal of Power Technologies

|

2014

|

tom Vol. 94, nr 3

176--189

EN

To improve the flexibility of the multilevel space vector pulse width modulation (SVPWM), various algorithms have been developed. A theoretical comparison is made for three 2-D SVPWM algorithms: they are g-h frame, α' - β' frame and multilevel SVPWM based on two-level (α* - β* frame). The aim is to provide a guideline for the selection of the most appropriate SVPWM technique for digital implementation. Among them, the α' - β' frame offers the best flexibility with the least calculation and is well suited for digital implementation. The α* - β* frame is the most intuitionistic but has the largest calculation. New general methods of the g-h frame and α' - β' frame for any level SVPWM are also provided, which needs only the angle θ and the modulation depth m to generate and arrange the final vector sequence. All three methods are implemented in a field programmable gate array (FPGA) with very high speed integrated circuit hardware description language (VHDL) and compared in terms of implementation complexity and logic resources required. Simulation results show the absolute advantages of α' - β' frame in briefness and resources use. Finally, an experimental test result is presented with a three-level neutral-point-clamped (NPC) inverter.

6

Open-circuit fault and tolerant method for 3-level T-type inverter using modified space vector PWM

51%

Majumdar S. , Mahato B. , Jana K. C.

Journal of Power Technologies

|

2020

|

tom Vol. 100, nr 3

240--249

EN

In this paper a modified space vector pulse-width modulation (SVPWM) technique for a three-phase T-type inverter is proposed that utilizes the state redundancies for fault-tolerant application. The performance of the T-type, 3-level inverter is analyzed with a three-phase induction motor load under the open-circuit fault condition of the inverter. The voltage space vectors of the three-level inverter under the open switch fault (open circuit fault) condition in any one leg of the three-phase inverter is analyzed and modified using the SVPWM adopted to overcome the problems of sudden stall at open switch fault conditions. Modelling and simulation of T-type 3-level inwerter using proposed modified space vector pulse width modulationis carried out in the MATLAB/SIMULINK environment. The experimental results are presented here for verification of the simulation results using real-time simulator (dSPACE 1103).