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Vijay, Vani
- A Simple Variable THD Load Emulation Technique for Performance Evaluation of Power Supply Equipment
Abstract Views :203 |
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Authors
Affiliations
1 Senior Research Fellow, Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 EEE Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and Capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
1 Senior Research Fellow, Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 EEE Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and Capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
Source
Power Research, Vol 12, No 2 (2016), Pagination: 245-250Abstract
Using load emulation, the performance of source side converters can be easily evaluated and improved without the need for actual load. Due to the increase in use of power electronic converters and SMPS based systems, the harmonic levels in load side has increased considerably. Hence emulation of variable THD load is very important in analysing the performance of source side converters and ensure the performance efficiency and power quality under such loads. Here a novel method of obtaining variable load using PWM control explained. The PWM is controlled in a rainbow sinusoidal fashion to obtain clipped waveform across a resistor so that harmonics is introduced in the Load. The power factor can also be varied in the system by paralleling it with leading and lagging converter circuits. The working principle, modelling and simulation are presented along with the results. Proposed technique provides accurate modulation of load THD and effect of harmonics loads on sources converter are also analysed using this.Keywords
Load Emulation, harmonic loads, current clipping- Micro controller programming for PWM control of MOSFET based converters
Abstract Views :182 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 EEE department, Manipal Institute of Technology, Manipal -576104, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 EEE department, Manipal Institute of Technology, Manipal -576104, IN
Source
Power Research, Vol 12, No 3 (2016), Pagination: 511-516Abstract
Pulse Width Modulation (PWM) control of MOSFET based converters is used in almost all electrical application for accurate and efficient operation, like in motor drives, power supply units, power conditioners etc. The algorithm of PWM control in such system is the most important factor determining the operational features which can be implemented using microprocessors, micro controller, digital signal processors or higher end technologies. Here a detailed study of micro controller programming is done for PWM control of MOSFET based converters. The method of configuring the controller for PWM generation and programming steps are explained in detail with an example of PIC16F877A micro controller. Hardware implementation is done and program variation for different operating characteristics are observed. Micro controller programming is easiest, accurate and cost effective method for PWM control of converter. The program is flexible and higher end micro controllers can be used for complex control technique.Keywords
Programming, micro controller, PWM control- Novel load emulation technique for performance evaluation of isolated solar PV system under varying load conditions
Abstract Views :187 |
PDF Views:0
Authors
Affiliations
1 Senior Research Fellow, Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Electrical and Electronics Engineering department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
1 Senior Research Fellow, Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Electrical and Electronics Engineering department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
Source
Power Research, Vol 12, No 1 (2016), Pagination: 133-138Abstract
Solar Photo Voltaic (SPV) sources are widely used in present scenario of energy crisis for various applications including grid connected PV plants and grid isolated standalone applications. The performance of solar PV system is highly dependent upon the operating conditions of source and loads especially in standalone applications. The effect on various types of loads on standalone system can be easily analyzed at design stage and testing stage by using load emulation technique, where a virtual load is used to replace actual load, giving more flexibility and accuracy to loading conditions. Here a novel load emulator model is presented which can provide accurate variation in load power factor and THD compared to existing models. The converter decouples the current in to in phase and out of phase components and the in phase component can be regenerated. The model is simulated using MATLABTM simulation and the results are validated by comparing with experimental results obtained by loading SPV inverter with actual load. Hence the proposed load emulator is very useful in design and development of application specific solar PV systems and also for performance analysis of such systems based on various standards.Keywords
Solar PV inverters, non-linear loads, low pf loads- Effect of Climatic Conditions on the Performance of Solar PV Inverters
Abstract Views :188 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
Source
Power Research, Vol 11, No 4 (2015), Pagination: 709-714Abstract
Electrical equipment designed for a particular environmental condition may not provide satisfactory performance under other conditions of temperature and humidity. Specifically in the case of solar PV inverters, the efficiency and other system characteristics may vary as per the extreme climatic conditions at the place of installation. Here a comparative study of solar PV inverter performance under such extreme conditions is presented in terms of system efficiency and insulation resistance. The conditions as per relevant international standards are simulated in a climatic chamber and five samples are studied for the effect of extreme temperature and humidity conditions. It is found that the insulation resistance of few samples is varying drastically which will affect the system safety. Similarly the efficiency of the system is also affected. Similarly there is considerable change in the system efficiency also.Keywords
Solar PV Inverters, Climatic Conditions, Insulation Resistance- 3-D Space Vector Modulation Algorithm for Multilevel Inverters in Abc Coordinates for Solar PV Applications
Abstract Views :284 |
PDF Views:0
Authors
Affiliations
1 Department of E&E, PES Institute of Technology, Bengaluru - 560100, IN
2 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bengaluru - 560080, IN
3 Department of Electrical Engineering, College of Engineering Trivandrum, Kerala - 695016, IN
1 Department of E&E, PES Institute of Technology, Bengaluru - 560100, IN
2 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bengaluru - 560080, IN
3 Department of Electrical Engineering, College of Engineering Trivandrum, Kerala - 695016, IN
Source
Power Research, Vol 11, No 1 (2015), Pagination: 139-144Abstract
Solar PV based Power generation is gaining importance in the present scenario of energy crisis. Precise control of Solar PV inverter is a very important factor deciding the efficiency and performance of Solar PV sources. Space Vector Modulation (SVM) technique is widely used for pulse width modulation in inverters, especially for power supplies for obtaining improved sine wave output. It is based on the representation of the three phase quantities as vectors in a two-dimensional using α and β co-ordinates. Here, a new three–dimensional (3-D) space vector algorithm in a-b-c co-ordinates for multilevel inverters is presented, which is based on the 3-Dimensional geometry of the vectors. This method calculates the on-state duration of switching vector without involving trigonometric functions, look-up tables or coordinate system transformation. Hence the computational complexity is very less compared to other algorithms. The proposed scheme is explained for a multilevel inverter and simulation results are presented with comparison of performance of a two level inverter and a three level inverter using this technique. The results shows that the algorithm can be applied for higher level inverter so that it operates at reduced Total Harmonic distortion.Keywords
Multilevel Inverters, Space Vector Modulation (SVM), Three-dimensional (3-D) Space Vector- Solar PV based switched reluctance motor drive for low power medium speed applications
Abstract Views :177 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Department of Electrical Engineering, College of Engineering Trivandrum, Kerala - 695016, IN
3 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560 080, IN
1 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Department of Electrical Engineering, College of Engineering Trivandrum, Kerala - 695016, IN
3 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560 080, IN
Source
Power Research, Vol 11, No 3 (2015), Pagination: 555-562Abstract
Solar Photovoltaic (SPV) is the most important renewable energy source which is gaining importance in all fields of electrical utility. Utilization of SPV source in electrical drives applications can bring about a considerable change in the present day energy crisis. Here an SPV based Switched Reluctance motor (SRM) drive is presented which can be utilized in low power high speed and medium speed applications. SRMs have inherent advantages of low inertia, low rotor losses, robustness and simple construction. The operation of the converter circuit is with respect to the reluctance variation of the rotating machine which makes it different from other drives. Here a converter circuit is designed for the operation of SRM from SPV source. The SPV characteristics are different from a constant DC source since the output power and voltage varies with insolation and temperature. The proposed system is verified using LabVIEWTM Simulation and the results are discussed.Keywords
Solar Photovoltaic (SPV), Switched reluctance Motor (SRM), LabVIEWTM, Reluctance- Design and testing of a novel single-stage half-bridge AC-DC converter for battery charging
Abstract Views :180 |
PDF Views:0
Authors
Affiliations
1 Asst .Prof, ,Dept. of Electrical & Electronics,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
2 Asst. Prof, ,Dept. of Electrical & Electronics ,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
3 M.Tech Scholar, Dept. of Electrical & Electronics ,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
1 Asst .Prof, ,Dept. of Electrical & Electronics,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
2 Asst. Prof, ,Dept. of Electrical & Electronics ,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
3 M.Tech Scholar, Dept. of Electrical & Electronics ,Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kollam-690525, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
Source
Power Research, Vol 11, No 2 (2015), Pagination: 383-390Abstract
AC-DC converters are used in most of the electrical utility applications especially in battery charging. Here, a novel topology for single-stage bridgeless ac-dc converter is presented which can give an isolated output voltage and input power factor correction. The input current to an ac-dc converter is rich in low order harmonics and so the total harmonic distortion is high and input power factor is poor. Hence Power Factor Correction (PFC) schemes have been implemented. The effectiveness of the converter is tested and verified in PSIMTM simulation software and in experimental hardware prototype. This topology is found to have reduced losses and better power factor correction compared to the single-stage PFC ac to dc converters with full-bridge diode rectifier. This topology is suitable for battery charging application with reduced losses and better power quality.Keywords
AC-DC Converter, half-bridge, single-stage, power factor correction- Effect of ambient temperature on the performance of power electronic converters
Abstract Views :205 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
Source
Power Research, Vol 10, No 4 (2014), Pagination: 769-774Abstract
Efficiency of power electronics devices are highly dependent on temperature. Hence temperature compensation and heat sink design are very important factors in maintaining the performance quality of power electronic converters. Thus the ambient temperature at which the device is operating also effects the performance since the heat removal by heat sinks or cooling fans is affected by the ambient temperature. Here a detailed analysis of the dependency of losses in power electronic switches on the junction temperature and in turn ambient temperature is presented. A theoretical Analysis of conduction losses and effect of ambient temperature on it is presented along with a set of experimental results by analyzing the performance of a 850W Solar PV inverter at various ambient temperatures. The results are satisfactorily explaining the effect of ambient temperature on converter efficiency.Keywords
Solar PV inverters, conduction Losses, heat sink, ambient temperature- Design of AC-DC converter with reduced harmonics and output ripples using active power factor correction technique
Abstract Views :192 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
2 E&E Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN
2 E&E Department, Manipal Institute of Technology, Manipal - 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore - 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
Source
Power Research, Vol 10, No 3 (2014), Pagination: 593-598Abstract
AC-DC converters are very commonly used in many power electronics applications including controllable sources and machine drives. Rectifier circuit results in harmonic distortions in AC side and requires large capacitive filter for reducing DC ripples on the output side. Use of active power factor technique can be utilized for solving this issue resulting in better performance of the converter. It basically consists of boost converter with high frequency switching following the rectifier controlled using a suitable microcontroller. This paper presents the detailed design and operation of Active power factor corrected rectifier which operates with reduced THD and improved power factor there by reducing losses in power flow and utility. Simulation of the designed converter and comparison with conventional topology is also discussed.Keywords
Rectifier; active power factor correction, capacitive filtering- Input and Output Distortions in the Operation of Stand alone Solar PV Inverters and Method for Compensation
Abstract Views :188 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore-560080, IN
2 E & E Department, Manipal Institute of Technology, Manipal-576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore-560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore-560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore-560080, IN
2 E & E Department, Manipal Institute of Technology, Manipal-576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore-560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore-560080, IN
Source
Power Research, Vol 10, No 1 (2014), Pagination: 147-154Abstract
Inverter and power conditioning circuit is the most important part of solar PV system which is responsible for providing the AC output as per the requirement of the application. The presence of AC harmonics and DC ripples in the inverter is still an unavoidable drawback, even though it has reduced to a great extent in past two decades. This paper presents a detailed study of distortions in the AC and DC sides of commercial standalone single phase Solar PV inverter and the effect of the same in the application. The harmonic content is evaluated by loading the inverter using electronic loading. The reduction in distortions in the AC and DC sides by utilization of a high impedance network on the DC side of the inverter is also evaluated by simulation. A comparative study of harmonics and DC ripples in the inverter under test and the simulated impedance source inverter is also presented.Keywords
Harmonics, Stand alone Solar PV inverters, DC ripples, Impedance network- Analysis of DC Link Capacitor Performance and Capacitor Life In Back to Back Converters With Respect to Converter Switching
Abstract Views :205 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore-560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore-560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
Source
Power Research, Vol 10, No 2 (2014), Pagination: 373-378Abstract
Back to Back converters are commonly used converters in many ac to ac conversion applications. Even though Converters without intermediate energy storage element are developed, Those with DC link capacitors still continue to be most popular due to the inherent advantages. The performance of such converters is affected by the operation of DC link capacitors used. This paper gives a detailed study of various types of back to back converters and considerations in DC link capacitor design and selection. A MATLAB program is also developed to analyze the effect of RMS (Root mean Square) ripple current and consequent effect on the life of the DC link capacitors in Voltage link back to back converters.Keywords
Back to back converters; matrix converter, DC link capacitors.- HERIC Configuration Based Back To Back Converter With Reduced Losses For Regenerative Load Applications
Abstract Views :201 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN
Source
Power Research, Vol 9, No 4 (2013), Pagination: 551-556Abstract
Back to back converters are used in many applications including machine drives and HVDC links. It is a combination of AC to DC and DC to AC converters with topologies suitable for the application. Here a single phase converter topology is developed by combining a Z source network and HERIC inverter which operates with lesser losses and more controllability. Compared to conventional inverter model, the conduction losses are much less in HERIC configuration. The Z source network help in boosting the DC voltage level so as to obtain the required level of AC output. This back to back converter is mainly meant for regenerative load application which can be utilized in equipment testing. The power drawn by the converter can be regenerated to supply back to the utility grid there by it is possible to conduct equipment testing without wasting energy. The details of the proposed configuration and the output wav forms are explained. Also a comparative study of the losses in conventional converter and proposed converter is presented.Keywords
Back to back converter, HERIC inverter, Z source nettwork, regenerative load- Load Emulators for Testing of Power Supplies - A Review
Abstract Views :191 |
PDF Views:0
Authors
Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560 080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore 560 080, IN
4 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore -560 080, IN
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore- 560 080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore 560 080, IN
4 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore -560 080, IN