scholarly journals SIMULATION OF THREE PHASE TRANSFORMERLESS ONLINE UPS USING MATLAB/SIMULINK

2017 ◽  
Vol 4 (05) ◽  
Keyword(s):  
Matlab Simulink ◽  
Three Phase

scholarly journals ASYMMETRICAL SIX-PHASE SPACE VECTOR PWM SCHEME / ASIMETRINIS ERDVINIO VEKTORIAUS MODULIAVIMO METODAS ŠEŠIŲ FAZIŲ ĮTAMPAI FORMUOTI

2014 ◽  
Vol 6 (2) ◽  
pp. 168-171 ◽  
Author(s):  
Tadas Lipinskis
Keyword(s):  
Modulation Scheme ◽  
Motor Speed ◽  
Space Vector ◽  
Matlab Simulink ◽  
Stator Windings ◽  
Simulink Simulation ◽  
Three Phase ◽  
Electricity Grids ◽  
Torque Pulsations ◽  
Vector Modulation

Multiphase electric motors have smaller torque pulsations and are more reliable that their three-phase alternatives. However, standard electricity grids around the world are three-phase, so power inverter is needed to drive multiphase motors. Inverter is used not only to power the motor, but also to control the am­plitude and frequency of the produced voltage, thus controlling motor speed and torque. Multiphase systems with odd number of phases have been widely investigated; therefore, this paper focuses on a six-phase inverter with a single neutral symmetrical load. A novel asymmetrical space vector modulation scheme is proposed and evaluated using simulations in Matlab/Simulink. Simulation results are compared to other modulation schemes. The proposed method is suitable for generating near-sinusoidal output voltages; however, it might not be suited for driving motors with sinusoidally distributed stator windings. Daugiafaziai elektros varikliai turi mažesnes sukimo momento pulsacijas ir didesnį patikimumą, lyginant su trifaziais varikliais. Pasaulyje paplitę trijų fazių elektros tinklai, todėl daugiafaziams varikliams maitinti reikalingi dažnio keitikliai, keičiantys standartinę vienfazę arba trifazę tinklo įtampą į daugiafazę. Dažnio keitiklis keičia ir išėjimo įtampos amplitudę, ir dažnį. Tai sudaro galimybių tiksliai valdyti variklio greitį. Literatūroje plačiai išnagrinėti daugiafazės įtampos formavimo metodai, esant nelyginiam fazių skaičiui. Darbe siūlomas naujas erdvinių vektorių asimetrinis įtampos formavimo algoritmas šešių fazių dažnio keitikliui, apkrautam simetrine apkrova su viena neutrale. Algoritmas tiriamas Matlab / Simulink programa, rezultatai palyginami su gautais, taikant kitus šešiafazės įtampos formavimo metodus.

Performance Evaluation of 3Φ Asymmetrical MLI with Reduced Switch Count

2016 ◽  
Vol 3 (3) ◽  
pp. 671
Author(s):  
Chinnapettai Ramalingam Balamurugan ◽  
S.P. Natarajan ◽  
T.S. Anandhi
Keyword(s):  
Performance Evaluation ◽  
High Power ◽  
Output Voltage ◽  
Multilevel Inverter ◽  
Matlab Simulink ◽  
Ac Drives ◽  
Three Phase ◽  
Multi Level ◽  
The Cost ◽  
Switching Strategies

The multi level inverter system is habitually exploited in AC drives, when both reduced harmonic contents and high power are required. In this paper, a new topology for three phase asymmetrical multilevel inverter employing reduced number of switches is introduced. With less number of switches, the cost, space and weight of the circuit are automatically reduced. This paper discusses the new topology, the switching strategies and the operational principles of the chosen inverter. Simulation is carried out using MATLAB-SIMULINK. Various conventional PWM techniques that are appropriate to the chosen circuit such as PDPWM, PODPWM, APODPWM, VFPWM and COPWM are employed in this work. COPWM technique affords the less THD value and also affords a higher fundamental RMS output voltage.

Transient Behavior Analysis of Induction Generator at Three-Phase Fault Condition

2007 ◽  
Vol 8 (2) ◽  
Author(s):  
Tomonobu Senju ◽  
Ryo Kuninaka ◽  
Toshiaki Kaneko ◽  
Yoshitaka Miyazato ◽  
Atsushi Yona ◽  
...  
Keyword(s):  
Block Diagram ◽  
Transient Behavior ◽  
Induction Generator ◽  
Matlab Simulink ◽  
System Equation ◽  
Wind Generators ◽  
Induction Generators ◽  
Three Phase ◽  
Analytical Formulas ◽  
Effective Use

In recent years, renewable energy generation has been coming up for effective use of natural energy, such as wind energy. Induction generators consisting squirrel-cage rotors are widely used as wind generators because of their salient features like robust rotor design, simplicity in the construction, maintenance free operation, etc. In this paper, it is derived that the transient current, electromechanical torque, and active power taking into account rotor speed change of induction generators at three-phase fault conditions. The output equations of the induction generator has nonlinearity, and the speed-time characteristic in a fault period is also expressed by the nonlinear equation. The approximation to derive analytical formulas for transient conditions is proposed, and the transient behavior of the induction generator is analyzed by the developed equations. The simulation block diagram in MATLAB/SIMULINK is constituted using the system equation in consideration of the nonlinearity of the induction generator. The simulation results obtained from each theoretical analysis are in close agreement with that of results obtained using MATLAB/SIMULINK simulation. Furthermore, theoretical discussion also developed to determine the fault phase angle and the time at which maximum transient currents flow in the system.

scholarly journals Design Analysis and Implementation of a Three Phase Seven Level PV & Wind based Microgrid

2019 ◽  
Vol 8 (10) ◽  
pp. 4495-4498
Keyword(s):  
Power Converters ◽  
Design Analysis ◽  
Matlab Simulink ◽  
Three Phase ◽  
Pv Modules

This paper proposes an “arrangement of converters for the incorporation of a huge photovoltaic (PV) plant with an utility AC lattice. “The framework involves a focal seven-level voltage-bolstered inverter (VFI) and a substantial number of PV modules with module-incorporated DC-DC converter. The seven-level VFI comprises of three-stage, three-level VFI units associated in parallel on the AC-side. This paper additionally proposes another sun based power age framework, which is made out of a DC/DC and DC/AC control converter and another seven-level inverter”. This new seven-level inverter is arranged utilizing a capacitor choice circuit and a full-connect control converter, associated in course. Seven dimension changes over sustained with PV modules give a practical answer for moderating consonant related issues brought about by diode or thyristor rectifier front-closes. To deal with the huge remuneration flows and give better warm administration, at least two paralleled semiconductor exchanging gadgets can be utilized. The proposed PV based seven dimension topology can likewise create seven voltage levels, which fundamentally diminishes the exchanging current swell and the measure of inactive components.The execution of the proposed power converters framework is considered utilizing MATLAB/Simulink.

scholarly journals Simulation on microgrid connected PV system under balance and unbalance fault

2019 ◽  
Vol 13 (3) ◽  
pp. 1332
Author(s):  
Ameerul A. J. Jeman ◽  
Naeem M. S. Hannoon ◽  
Nabil Hidayat ◽  
Mohamed M. H. Adam ◽  
Ismail Musirin ◽  
...  
Keyword(s):  
Photovoltaic System ◽  
Pv System ◽  
Matlab Simulink ◽  
Three Phase ◽  
Point Of Common Coupling ◽  
Simulation Results ◽  
Common Coupling ◽  
Types Of Faults ◽  
Three Phases

<p><span>This paper presents an analysis in Matlab/Simulink of a three-phase photovoltaic system under balance and unbalance faults in Matlab/Simulink. The aim of this paper is to investigate the performance of the system under various types of fault. The simulation involved various types of faults occurring at different distances from the point of common coupling of the PV system. This paper also aimed to identify what type of fault that may severely damage the system. The simulation results presented in this paper show that the three-phase fault in the microgrid was severely affecting the system since it involved all the three phases of the system while the distance of the fault occurrence is less influenced in the system. The purpose of this research is to observe the effect on the system based on the types of faults occur and the distance faults occur.</span></p>

scholarly journals Mathematical Model Implementation of SPWM fed Three-phase Induction Motor Drive Using MATLAB Simulink

2020 ◽  
Vol 25 ◽  
pp. 328-332
Author(s):  
Amir Rasyadan ◽  
Sazali bin Yaacob ◽  
Pranesh Krishnan ◽  
Mohamed Rizon ◽  
Ang Chun Kit ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Induction Motor ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Matlab Simulink ◽  
Three Phase
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