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Mahor, Amita
- Analysis and Comparison of Three Phase VSI Fed Induction Motor Drive by Using Various Pulse Width Modulation Techniques
Authors
Source
International Journal of Innovative Research and Development, Vol 4, No 3 (2015), Pagination:Abstract
Switching techniques of pulse width modulation (PWM) have been popular in the area of power electronics and drive systems. PWM is commonly used in applications like motor speed control, converters audio amplifiers etc. PWM is used to adjust voltage applied to the motor. There is no single PWM method which can suite for all applications. As per the advanced technology in solid state power electronic devices and microprocessors, various pulse-width modulation (PWM) techniques have been developed for different industrial applications. For the above reasons, the PWM techniques have been the subject of intensive research since 1970s. The main objective of the PWM is to control the inverter output voltage and to reduce the harmonic content in the output voltage. The pulse width modulation (PWM) techniques are mainly used for voltage control. These techniques are most efficient and they control the drives of the switching devices. The different PWM techniques are Single pulse width modulation, Multiple pulse width modulation, Phase displacement control, Sinusoidal pulse width modulation, Harmonic Injection modulation, Space Vector pulse width modulation, Hysteresis (Delta) pulse width modulation, Selective Harmonic Elimination and Current Controlled pulse width modulation. Hysteresis controller is used for Current source inverter and all the remaining PWM techniques are used for Voltage source inverter. Sinusoidal and Space Vector PWM techniques are most widely used. They control the output voltage as well as reduce the harmonic.
Keywords
PWM technique, multilevel inverters, reduced components, summer, Ac power generationFull Text
- Analysis and Comparison of Three Phase VSI Fed Induction Motor Drive by Using Various Pulse Width Modulation Techniques
Authors
Source
International Journal of Innovative Research and Development, Vol 4, No 3 (2015), Pagination:Abstract
Switching techniques of pulse width modulation (PWM) have been popular in the area of power electronics and drive systems. PWM is commonly used in applications like motor speed control, converters audio amplifiers etc. PWM is used to adjust voltage applied to the motor. There is no single PWM method which can suite for all applications. As per the advanced technology in solid state power electronic devices and microprocessors, various pulse-width modulation (PWM) techniques have been developed for different industrial applications. For the above reasons, the PWM techniques have been the subject of intensive research since 1970s. The main objective of the PWM is to control the inverter output voltage and to reduce the harmonic content in the output voltage. The pulse width modulation (PWM) techniques are mainly used for voltage control. These techniques are most efficient and they control the drives of the switching devices. The different PWM techniques are Single pulse width modulation, Multiple pulse width modulation, Phase displacement control, Sinusoidal pulse width modulation, Harmonic Injection modulation, Space Vector pulse width modulation, Hysteresis (Delta) pulse width modulation, Selective Harmonic Elimination and Current Controlled pulse width modulation. Hysteresis controller is used for Current source inverter and all the remaining PWM techniques are used for Voltage source inverter. Sinusoidal and Space Vector PWM techniques are most widely used. They control the output voltage as well as reduce the harmonic.
Keywords
PWM technique, multilevel inverters, reduced components, summer, Ac power generationFull Text
- Performance Analysis of Multilevel Inverters in Fuel Cell Applications
Authors
1 Department of Electrical & Electronics Engineering, NRI, Bhopal (M.P.), IN
Source
International Journal of Scientific Engineering and Technology, Vol 1, No 4 (2012), Pagination: 102-106Abstract
As the world's energy use continues to grow, the development of clean distributed generation becomes increasingly important. Fuel cells are an environmentally friendly renewable energy source that can be used in a wide range of applications and are ideal for distributed power applications. A Fuel Cell is a device that electrochemically converts fuel into electricity. The fuel cell uses an electrochemical process which converts the fuel directly into electricity with little energy loss in the form of heat. The static (V-I) characteristics of fuel cells show more than a 30% difference in the output voltage between no-load to full-load conditions. This inevitable decrease, which is caused by internal losses, reduces the utilization factor of the fuel cells at low loads. Additionally, the converters fed by these fuel cells have to be derated to accommodate higher input voltages at low currents. When one of these fuel cells is connected to an inverter, they will not be able to produce ac grid level voltages. A dc-dc boost converter is generally required to boost the voltage level for the inverter. This boost converter, in addition to boosting the fuel cell voltage, also regulates the inverter input voltage and isolates the low and high voltage circuits. In this paper Analysis of cascaded bridge multilevel inverter have with & without pwm techniques have been done & results are also compared based on the harmonics available.Keywords
Fuel Cell, PWM, Harmonics, Converter and Inverter.Full Text
- Optimal Generation Scheduling of Cascaded Hydroelectric System using Natural Exponential Inertia Weight PSO
Authors
1 Department of Electrical & Electronics Engineering, NIIST, Bhopal, IN
2 Department of Electrical & Electronics Engineering, NIIST Bhopal, IN
Source
International Journal of Scientific Engineering and Technology, Vol 1, No 2 (2012), Pagination: 27-33Abstract
Generation scheduling is a most important task in the operation and planning of power system. It can be on real term, short term, medium term, and long term basis as per the scheduled horizon. Scheduling of purely hydroelectric system differ from the thermal scheduling and hydrothermal scheduling problems in two aspects firstly fuel cost for the thermal part of the system can no longer be used in the objective function. Secondly water availability in seasonal reservoirs is the necessary part of such system. Many researchers suggested different solution algorithms of optimization for each type of problem and claimed better solution. This paper presents a Natural Exponential Inertia Weight Particle Swarm Optimization (NEIW_PSO) approach to determine the optimal generation schedule of hydro power plants of cascaded hydroelectric test system.Keywords
Particle Swarm Optimization, Natural Exponential Inertia Weight PSO, Short Term Generation Scheduling.Full Text
- Analysis of Impact of Firing Angle on an AC Chopper in Terms of Harmonic Distortion & Power Factor
Authors
1 Department of Electrical & Electronics Engineering, N.R.I., Bhopal (M.P.), IN
2 Infosys, IN
Source
International Journal of Scientific Engineering and Technology, Vol 1, No 2 (2012), Pagination: 118-122Abstract
The phase angle controlled AC choppers are widely used for voltage regulation & controlling. Apart from the advantages of method such as low cost I Simple construction, easy operation it has a major disadvantage of inducing Harmonic components & power factor even with pure resistive load. Hence in this paper we are analyzing the various aspects of AC choppers by Simulation & mathematical analysis. The AC chopper considered in this paper is symmetric & the Switching devices are considered to have ideal Switching characteristics for mathematical Analysis. The Simulation & graphical analysis are performed in MALAB/ Simulink.Keywords
AC Choppers, Harmonic Distortion, Power Factor.Full Text
- Active Power Filter Techniques for Harmonics Suppression in Non Linear Loads
Authors
1 Department of Electrical & Electronics Engineering, N.R.I., Bhopal (M.P.), IN
Source
International Journal of Scientific Engineering and Technology, Vol 1, No 2 (2012), Pagination: 123-127Abstract
The growth in electronic devices applications increasing the non linear loads in power systems because most of these devices involve uses regulated power supply such as SMPS, Choppers etc. but because of the non linearity involved with the controlling process it produces undesired harmonics and reactive components which causes the heating, vibration electromagnetic interference etc. hence to mitigate these problems many methods are suggested such as use of passive LC filters and other controlled active power filters (APF) with different controlling algorithms and topologies. In this paper we presents the study & analysis of various active techniques used for suppression of harmonics. The matter and discussion performed in this paper may be used for system designer for adopting the best filter according to operating conditions and requirements.Keywords
Active Power Filters (APF), Harmonic Distortion, Hybrid Power Filters.Full Text