Pulsewidth Modulation Strategies (original) (raw)
Related papers
PULSE WIDTH MODULATION TECHNIQUES FOR INVERTERS
In this project, we have generated ten different types of pulse width modulation techniques for inverters. The microcontroller is the most efficient tool for generating various pulse width modulation techniques. Microcontroller is used to produce different types of pulse width modulation techniques and those pulses are fed to the inverter . A opto-isolator is used to feed the pulses from the microcontroller to the inverter. The advantages of PWM based switching power converter over linear power amplifier are Lower power dissipation, Easy to implement and control, No temperature variation and aging-caused drifting or degradation in linearity and Compatible with today’s digital micro-processors. In this project study and comparison of different types of pulse width modulation controlled methods are implemented. The different PWM techniques are Single-pulse modulation, Multiple pulse modulation and Sinusoidal pulse width modulation, Modified sinusoidal pulse width modulation, Harmonics Injected modulation, Phase Displacement control, stepped modulation, staircase modulation, trapezoidal modulation and selected harmonics modulation are implemented using microcontroller in software and hardware.
A Novel Pulse-Width and Amplitude Modulation (PWAM) Control Strategy for Power Converters
Journal of Power …, 2010
Typical power electronic converters employ only pulse width modulation (PWM) to generate specific switching patterns. In this paper, a novel control strategy combining both pulse-width and amplitude modulation strategies (PWAM) has been proposed for power converters. The Pulse Amplitude Modulation (PAM), used in communication systems, has been applied to power electronic converters. This increases the degrees of freedom in eliminating or mitigating harmonics when compared to the conventional PWM strategies. The role of PAM in the novel PWAM strategy is based on the control of the converter's dc sources values. Software implementation of the conventional PWM and the PWAM control strategies has been applied to a five-level inverter for mitigating selective harmonics. Results show the superiority of the proposed strategy from the THD point of view along with a reduction in the inverter power dissipation. , design, and control of power electronic converters/systems and motor drives. His area of interest also includes embedded software development for power electronics and electric drives using microcontrollers and DSPs.
IETE Journal of Research, 2020
Voltage source inverters are the most preferred in a variety of medium and high power applications. The control of inverter output voltage gives desirable outputs in drives and many applications. Pulse width modulation (PWM) techniques strongly influence the inverter output. Space vector pulse width modulation (SVPWM) technique is one among the prominent techniques that are used for inverter switching control. This paper is devoted to the review of variety of control strategies on SVPWM evolved over the past 20 years and its thrust on the output voltage of inverter and current with the description of the various sequences and its behaviour for both two-level and three-level inverter for an induction motor drive. The various PWM control strategies based on Space vector PWM are categorized as follows: Bus Clamping PWM, Advanced Bus Clamping PWM, and Hybrid PWM. The merits and demerits of each SVPWM techniques are presented by analysing the experimental results from the literature. SVPWM can also be achieved by triangular comparison approach other than space vector approach which is meritorious in some aspects like lower computation and memory requirements. This paper also deals with the review of space vector PWM on triangular comparison approach which is termed as carrier-based SVPWM.
Pulse Width Modulation (PWM) Inverter for Control Applications
International journal of recent trends in engineering & research, 2019
Industrial automation point of view inverter plays a very important role in developing drives. The PWM is widely used for motion control with two level voltage source inverters to obtain a quality output voltage or a current waveform with minimum amount of ripple content that they require for high switching frequency along with various pulse width modulation (PWM) strategies. These two level inverters have drawn tremendous inverters for high voltage and high power applications. This paper has proposed for design and implementation of sinusoidal pulse width Modulation i.e SPWM and multilevel technique to decrease the harmonics. The design and development of multilevel techniques will carried out in Matlab / Simulink environment.
Space Vector Pulse Width Modulation Schemes for Two-Level Voltage Source Inverter
Space Vector Pulse Width Modulation (SVPWM) method is an advanced, computation intensive PWM method and possibly the best among all the PWM techniques for variable frequency drive applications. The SVPWM is an alternative method for the determination of switching pulse width and their position. The major advantage of SVPWM stem from the fact that, there is a degree of freedom of space vector placement in a switching cycle. This feature improves the harmonic performance of this method. This method has been finding widespread application in recent years because of the easier digital realization and better dc bus utilization. In this paper, three SVPWM schemes, called 7-segment space vector modulation (SVM), 7-segment SVM with even-order harmonic elimination and 5-segment (discontinuous) SVM are studied in detail. The theoretical analysis, design, switching sequence and SIMULINK implementation of these three SVM schemes is presented in step-by-step manner.
SIMULATION AND COMPARISON OF SPWM AND SVPWM CONTROL FOR THREE PHASE INVERTER
A voltage source inverter is commonly used to supply a three-phase induction motor with variable frequency and variable voltage for variable speed applications. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. The different methods for PWM generation can be broadly classified into Triangle comparison based PWM (TCPWM) and Space Vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals for the three phases. In SVPWM methods, a revolving reference voltage vector is provided as voltage reference instead of three phase modulating waves. The magnitude and frequency of the fundamental component in the line side are controlled by the magnitude and frequency, respectively, of the reference vector. The highest possible peak phase fundamental is very less in sine triangle PWM when compared with space vector PWM. Space Vector Modulation (SVM) Technique has become the important PWM technique for three phase Voltage Source Inverters for the control of AC Induction, Brushless DC, Switched Reluctance and Permanent Magnet Synchronous Motors. The study of space vector modulation technique reveals that space vector modulation technique utilizes DC bus voltage more efficiently and generates less harmonic distortion when compared with Sinusoidal PWM (SPWM) technique. In this paper first a model for Space vector PWM is made and simulated using MATLAB/SIMULINK software and its performance is compared with Sinusoidal PWM. The simulation study reveals that Space vector PWM utilizes dc bus voltage more effectively and generates less THD when compared with sine PWM.
IJERT-A Comparative Study of Various PWM Techniques
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/a-comparative-study-of-various-pwm-techniques https://www.ijert.org/research/a-comparative-study-of-various-pwm-techniques-IJERTV4IS110125.pdf Pulse-width modulation is the process of modifying the width of the pulses in a pulse train in direct proportion to a small control signal; the greater the control voltage, the wider the resulting pulses become. By using a sinusoid of the desired frequency as the control voltage for a PWM circuit, it is possible to produce a high-power waveform whose average voltage varies sinusoidally in a manner suitable for driving ac motors. This paper presents the MATLAB/Simulink based models of various PWM techniques usually employed.
A Unified Space Vector Pulse Width Modulation For Dual Level Inverter System
—AC loads requires variable voltage and variable frequency. These requirements are fulfill by a voltage source inverter. A variable output voltage can be achieved by varying the input dc voltage and keeping the gain of the inverter constant. On the other hand, if the dc input voltage is fixed and it is not controllable, a variable output voltage can be achieved by varying the gain of the inverter, which is normally accomplished by pulse-width-modulation control within the inverter. There are number of pulse width modulation techniques but only Space vector technique is a good choice among all techniques to control voltage source inverter. Space vector pulse width modulation (SVPWM) is an advanced and very popular method with several advantages such as its effective DC bus utilization, less harmonic generation in output voltage, less switching losses, wide linear modulation range etc. Owing to these advantages, it is being mostly used to control an inverter. In this paper, constant dc voltage source inverter has been taken and also SVPWM has been implemented for two-level VSI using MATLAB /SIMULINK. Key words—Pulse width modulation (PWM), Space vector pulse width modulation (SVPWM), Total harmonic distortion (THD), Voltage source inverter (VSI).
Inverters are able to produce single or three phase AC voltages from a constant or variable DC voltage. There are several algorithms to control output voltage. In addition to the desired output harmonic, each algorithm produces unwanted harmonics at Voltage Source Inverter (VSI) output voltage. In case of reducing low order harmonics, Space Vector Pulse Width Modulation (SVPWM) is more effective than other PWM algorithms such as trapezoidal, sinusoidal, harmonic injected, delta and phase shifted PWM. One may use different strategies to implement SVPWM algorithm in case of sector utilization in each switching period. Different strategies may be of relative advantages and disadvantages with respect to each other. In this paper, we propose five different strategies to synthesize the same output voltage using SVPWM. Then, we will introduce the best algorithm, with respect to different indices such as Total Harmonic Distortion (THD), Distortion Factor (DF), conduction loss, switching los...