Design of Boost Inverter for Solar Power Based Stand Alone Systems

This paper presents a new ideology called as boost inverter which converts input DC supply into AC directly without using any filter circuit. The main part of today’s research work is to use solar energy efficiently. While using for AC autonomous loads, the output from the solar panel should not suffer any losses during the various power conversion stages. The conventional voltage source inverter, which is currently in usage, produces an AC output voltage lower than the DC input supply and thus it requires another power conversion stage. It can be used to drive the loads only after removing the ripples using a filter. The main objective of the project is to produce an AC output voltage higher than the DC input voltage in a single stage. Thus the number of power conversion stages is reduced by using boost inverter circuit. Since Pulse Width Modulation technique is used to drive the circuit, the requirement of a filter at the output is not needed

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Caracterización del método SVPWM con inversor trifásico de dos niveles

Revista ECIPeru ◽

10.33017/reveciperu2019.0005/ ◽

2019 ◽

pp. 22-29

Keyword(s):

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Harmonic Distortion ◽

Input Voltage ◽

Good Choice ◽

Voltage Source ◽

Voltage Source Inverter ◽

Matlab Simulink ◽

Wide Range

Caracterización del método SVPWM con inversor trifásico de dos niveles Juan Tisza1, 2, Javier Villegas2 1Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac, Lima Perú 2Universidad Nacional Mayor de San Marcos, Ciudad Universitaria, Lima, Perú Recibido 17 de junio del 2019, Revisado el 17 de julio de 2019 Aceptado el 19 de julio de 2019 DOI: https://doi.org/10.33017/RevECIPeru2019.0005/ Resumen Las cargas en Corriente Alterna (CA) requieren voltaje variable y frecuencia variable. Estos requisitos se cumplen con un inversor de fuente de voltaje (VSI). Se puede lograr un voltaje de salida variable variando la tensión de CC de entrada y manteniendo constante la ganancia del inversor. Por otro lado, si la tensión de entrada CC es fija y no es controlable, se puede lograr una tensión de salida variable variando la ganancia del inversor, lo que normalmente se logra mediante el control de modulación por ancho de pulso dentro del inversor. Hay varias técnicas de modulación de ancho de pulso, pero la técnica de vector espacial es una buena opción entre todas las técnicas para controlar el inversor de fuente de voltaje. La modulación por ancho de pulso de vector espacial (SVPWM) es un método avanzado y muy popular con varias ventajas tales como la utilización efectiva del bus de CC, menos generación de armónicos en voltaje de salida, menos pérdidas de conmutación, amplio rango de modulación lineal, etc. En este documento, se ha tomado un inversor de fuente de voltaje constante CC y se ha implementado la SVPWM para VSI de dos niveles utilizando MATLAB / SIMULINK. Descriptores: Modulación de ancho de pulso (PWM), modulación de ancho de pulso de vector espacial (SVPWM), distorsión armónica total (THD), inversor de fuente de voltaje (VSI). Abstract Alternating Current (AC) loads require variable voltage and variable frequency. These requirements are met by a voltage supply inverter (VSI). A variable output voltage can be achieved by varying the input DC voltage and keeping the inverter gain constant. On the other hand, if the DC input voltage is fixed and not controllable, a variable output voltage can be achieved by varying the gain of the inverter, which is normally achieved by controlling the pulse width modulation within the inverter. There are several pulse width modulation techniques, but the spatial vector technique is a good choice among all the techniques for controlling the voltage source inverter. Spatial vector pulse width modulation (SVPWM) is an advanced and very popular method with several advantages such as effective utilization of CC bus, less harmonic generation in output voltage, less switching losses, wide range of linear modulation, etc. In this document, a CC constant voltage source inverter has been taken and SVPWM has been implemented for two-level VSI using MATLAB / SIMULINK. Keywords: Pulse Width Modulation (PWM), Space Vector Pulse Width Modulation (SVPWM), Total Harmonic Distortion (THD), Voltage Source Inverter (VSI).

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Synchronized Symmetrical Bus-Clamping PWM Strategies for Three Level Inverter: Applications to Low Switching Frequencies

International Journal of Emerging Electric Power Systems ◽

10.2202/1553-779x.2722 ◽

2011 ◽

Vol 12 (2) ◽

Author(s):

Sreenivasappa Bhupasandra Veeranna ◽

Udaykumar R Yaragatti ◽

Abdul R Beig

Keyword(s):

Pulse Width ◽

Output Voltage ◽

High Performance ◽

Pulse Width Modulation ◽

Industrial Applications ◽

Voltage Source ◽

Switching Frequency ◽

Space Vector ◽

Digital Implementation ◽

Switching Losses

The digital control of three-level voltage source inverter fed high power high performance ac drives has recently become a popular in industrial applications. In order to control such drives, the pulse width modulation algorithm needs to be implemented in the controller. In this paper, synchronized symmetrical bus-clamping pulse width modulation strategies are presented. These strategies have some practical advantages such as reduced average switching frequency, easy digital implementation, reduced switching losses and improved output voltage quality compared to conventional space vector pulse width modulation strategies. The operation of three level inverter in linear region is extended to overmodulation region. The performance is analyzed in terms THD and fundamental output voltage waveforms and is compared with conventional space vector PWM strategies and found that switching losses can be minimized using bus-clamping strategy compared to conventional space vector strategy. The proposed method is implemented using Motorola Power PC 8240 processor and verified on a constant v/f induction motor drive fed from IGBT based inverter.

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Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation

Energies ◽

10.3390/en14227643 ◽

2021 ◽

Vol 14 (22) ◽

pp. 7643

Author(s):

Lingling Cao ◽

Jiefeng Lin ◽

Shikai Chen ◽

Yuanmao Ye

Keyword(s):

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Reactive Power ◽

Input Voltage ◽

Industrial Applications ◽

Multilevel Inverter ◽

Switching Frequency ◽

Switched Capacitor ◽

Cascaded Multilevel Inverter

Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.

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Development and Analysis of Pulse Width Modulation Techniques for Induction Motor Control

Mehran University Research Journal of Engineering and Technology ◽

10.22581/muet1982.2001.09 ◽

2020 ◽

Vol 39 (1) ◽

pp. 81-96

Author(s):

Sunny Katyara ◽

Ashfaque Hussain Hashmani ◽

Bhawani Shanker Chowdhry

Keyword(s):

Motor Control ◽

Induction Motor ◽

Pulse Width ◽

Pulse Width Modulation ◽

Research Work ◽

Voltage Source ◽

Modulation Factor ◽

Switching Losses ◽

Harmonic Content ◽

High Modulation

SVPWM (Space Vector Pulse Width Modulation) technique is type of traditional PWM method that efficiently utilizes its dc link voltage and generates high voltage pulses with low harmonic content and high modulation index. VSI (Voltage Source Inverter) with SVPWM generates adjustable voltage and frequency signals for VSDs (Variable Speed Drives). This research work presents the simplified SVPWM technique for controlling the speed and torque of induction motor. The performance of developed SVPWM technique is analyzed in terms of its switching losses and harmonic content and compared with SPWM (Sinusoidal Pulse Width Modulation). Mathematical modeling for induction motor control through two-level VSI with SVPWM and SPWM is presented. The voltage and current TDHs (Total Harmonic Distortions) of the drive with SVPWM technique are 73.23 and 63.3% respectively as compared to 101.99 and 77.89% with SPWM technique. Similarly, the switching losses with SVPWM technique are 178.79 mW and that of with SPWM are 269.45 mW. Simulink modeling and laboratory setup are developed to testify the efficacy of SVPWM and SPWM techniques. The modulation factor of SVPWM technique is 0.907 which is higher as compared to SPWM technique with 0.785 modulation factor.

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Comparison of Multicarrier PWM Techniques for Cascaded H-Bridge Multilevel Inverter

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v8.i2.pp861-868 ◽

2017 ◽

Vol 8 (2) ◽

pp. 861 ◽

Cited By ~ 1

Author(s):

Hashim Hasabelrasul ◽

Xiangwu Yan

Keyword(s):

High Power ◽

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Power Level ◽

Power Conversion ◽

Multilevel Inverter ◽

Multilevel Inverters ◽

Simulation Results ◽

Multicarrier Pwm

One of the preferred choices of electronic power conversion for high power applications are multilevel inverters topologies finding increased attention in industry. Cascaded H-Bridge multilevel inverter is one of these topologies reaching the higher output voltage, power level and higher reliability due to its modular topology. Level Shifted Carrier Pulse Width Modulation (LSCPWM) and Phase Shifted Carrier Pulse Width Modulation are used generally for switching cascaded H-bridge (CHB) multilevel inverters. This paper compares LSCPWM and PSCPWM in terms of total harmonics distortion (THD) and output voltage among inverter cells. Simulation for 21-level CHB inverter is carried out in MATLAB/SIMULINK and simulation results are presented.

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A study on performances of carrier-based pulse-width modulation techniques for three-phase three-level t-type neutral-point-clamped inverter under switch-open-circuit fault on two neutral-point-connected legs

Science & Technology Development Journal - Engineering and Technology ◽

10.32508/stdjet.v3i3.659 ◽

2020 ◽

Vol 3 (3) ◽

pp. first

Author(s):

Nhờ Văn NGUYỄN ◽

HONG-PHONG NGUYEN LE

Keyword(s):

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Short Circuit ◽

Harmonic Distortion ◽

Open Circuit ◽

Neutral Point ◽

Voltage Source ◽

Voltage Source Inverters ◽

Critical Issues

Multilevel voltage source inverters (VSIs) have been used for several decades thanks to their advantages compared with traditional two level VSI. Among various types of multilevel configuration, the T-type neutral-point-clamped VSI (3L TNPC VSI or 333-type VSI) has gained the attention in recent years. Due to the unique structure, the 333-type VSI has critical issues in reliability in operation such as switch-open-circuit (SOC) and switch-short-circuit (SSC), which lead to several unrequired issues, for instance, reduction of system performance, distorted and unbalanced output voltages and currents, or triggering the protection circuits. In some applications, the amplitude reduction and harmonics distortion of output voltages in SOC faults are not acceptable. Therefore, it is necessary to develop a pulse-width modulation (PWM) algorithm for 333-type VSI working under SOC fault which guarantees the desired output fundamental component voltage. The simultaneous SOC fault on two neutral-point-connected legs in the 333-type VSI may cause a large reduction in the output voltage. Under this circumstance, the 333-type VSI becomes an asymmetrical one called 322-type VSI. Certain studies regarding to the operation of 333-type VSI under SOC faults have been carried out. However, these studies require more semiconductor devices in order to create a redundant switching circuit. This leads to higher system cost with reduced inverter effieciency due to the additional loss. In this study, two carrier-based pulse-width modulation (CBPWM) techniques, i.e. 322-sinusoidal PWM (322-SPWM) and 322-medium offset CBPWM (322-MOCBPWM) are proposed for 322-type VSI. The proposed techniques are firstly simulated in MATLAB/Simulink and then implemented on a hardware setup. Performances of the proposed techniques are evaluated in terms of total harmonic distortion (THD) and weighted-THD (WTHD) of output voltages. Simulation results show that considering the worst output voltage under SOC fault, vBC, the proposed 322-SPWM technique could improve the THD by 40% and the WTHD by 94% compared with the uncompensated case with m=0.8. The corresponding results of 322-MOCBPWM technique are 42% and 96%, respectively. Characteristics of THD and WTHD values are also presented for demonstration the effectiveness of the proposed algorithm.

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Efficient Performance Technical Selection of Positive Buck-Boost Converter

Al-Kitab Journal for Pure Sciences ◽

10.32441/kjps.02.02.p2 ◽

2018 ◽

Vol 2 (2) ◽

pp. 20-38

Author(s):

Ahmed Abbas ◽

Abadal-Salam Hussain

Keyword(s):

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Input Voltage ◽

Boost Converter ◽

Dc Voltage ◽

Voltage Polarity ◽

Efficient Performance ◽

Efficient Power ◽

Selection Of

The necessity for stable DC voltage in both removable and non-removable systems has been considerably desired recently. These systems have to be implemented efficiently in order to be responding rapidly based voltage variations. Under this act, the efficient power can extend the lifetime of the employed batteries in such systems. The presented efficiency can be realized with respect to buck and boost components that were implemented to generate what is called positive Buck-Boost converter circuits. The main functions of the positive Buck-Boost converter are identified by announcing the unchanged situation of output voltage polarity and indicating the level of the voltage rationally between the input and the output. It is worth mention, the positive Buck-Boost converter circuit was simulated based Proteus software, and the hardware components were connected in reality. Finally, the microcontroller type that employed in the proposed system is PIC_16F877A, which realizes the input voltage sensitively to generate Pulse Width Modulation (PWM) signals in order to feed the employed MOSFET element.

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Investigation on Harmonic Spreading Effect of Conventional and Innovative Multi-Level Inverter Control Strategies

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.626.141 ◽

2014 ◽

Vol 626 ◽

pp. 141-149 ◽

Cited By ~ 1

Author(s):

Shibu J.V. Bright ◽

V. Suba ◽

S. Ramkumar ◽

S. Jeevananthan

Keyword(s):

Pulse Width ◽

Output Voltage ◽

Pulse Width Modulation ◽

Acoustic Noise ◽

Multilevel Inverter ◽

Superior Performance ◽

Voltage Source ◽

Switching Frequency ◽

Spreading Effect ◽

Harmonic Injection

The pulse width modulation (PWM) strategy employed in the voltage source inverter (VSI) not only control the magnitude of the output voltage but also the quality. Performance evaluations of such strategies are done in terms of fundamental voltage, total harmonic distortion (THD), switching losses etc. (primary indices) and also in terms of acoustic noise, electromagnetic interference (EMI), harmonic spread factor, distribution of harmonic power etc. (secondary indices). Multilevel inverter (MLI) has become unanimous choice in medium and high power applications due to their superior performance compared to three level inverters. The conventional Sub-Harmonic PWM (SHPWM) scheme and its variations offer the output voltage spectrum with high intensity harmonic components around the switching frequency; it will end with cluster harmonic with high acoustic noise. The first objective of this paper is to investigate harmonic spreading effects of existing multilevel inverter (MLI) strategies. Secondly the developing innovative PWM strategies for MLIs based on modified reference and carrier functions, which were proved for superior the primary indices at three-level VSI. Thorough simulation study of Pulse width modulation strategies such as SHPWM, inverted sine carrier PWM, MWM PWM, third harmonic injection PWM, triplen harmonic injection PWM, analog space vector PWM, trapezoidal PWM and discontinuous PWM for a cascaded multilevel inverter, are presented with results of primary and secondary indices. Hence, the PWM strategies of MLI are evaluated for harmonic spreading effect first time and a guide line for a beginner to select the PWM scheme for MLI fed drive systems is stenciled.

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Simplified five-level voltage source inverter with level-phase-shifted carriers based modulation technique

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v13.i2.pp461-468 ◽

2019 ◽

Vol 13 (2) ◽

pp. 461

Author(s):

Suroso Suroso ◽

Daru Tri Nugroho ◽

Abdullah Nur Azis ◽

Toshihiko Noguchi

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Voltage Source ◽

Voltage Waveform ◽

Pwm Inverter ◽

Dc Voltage ◽

Power Semiconductor ◽

Power Switches ◽

Inverter Circuit ◽

Modulation Control

A simplified circuit topology of the five-level pulse width modulation (PWM) inverter for DC-AC power conversion with no-isolated DC voltage sources and reduced switching device number is presented in this paper. The inverter circuit is based on the three-level H-bridge inverter configuration. The developed five-level inverter needs only five controlled power switches and four isolated gate drive circuits. Furthermore, the proposed topology does not require bidirectional power semiconductor controlled switches, hence a conventional discrete power MOSFETs or IGBTs can be used to build the inverter circuits. To obtain a better quality output voltage waveform, the level-phase-shifted carriers based sinusoidal pulse width modulation control was applied to produce a five-level PWM voltage waveform. The proposed inverter circuit was examined by using computer simulation with Power PSIM software. The basic principle operation of the inverter circuit was verified experimentally in laboratory using two non-isolated DC voltage sources as the inputs of the inverter’s prototype circuit. Some analysis of inverter’s output waveforms are provided and discussed.

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