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Design and Installation of Passive Power Filter for Grid-connected Solar Rooftop Applications at Industrial Plants
(2019-05-15)
Boonseng, C.
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Rapeepornpat, B.
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Suksawat, D.
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Nilnimitr, N.
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Inwanna, W.
This paper presents a study of harmonic filters design to minimize harmonic distortion caused by a harmonic source such as ac drives and solar rooftop inverters. To avoid a problem caused by the harmonics which is produced from ac drives and solar inverters, the Passive Power Filters System (PPFs) are presented. The analysis includes the basic principles, the KMITL Program and economic aspects of the harmonic filter design. The major objectives in the study are to improve the power factor, to reduce current and voltage distortion and to reduce resonance problems at a system. Practically, it is ensured that the PPFs is the best solution applied for grid-connected system. The results show that the 5th harmonic filters are a very appropriate solution for most typical harmonic problems.
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Power Factor Improvement and Inrush Current Reduction of a Grid Connected Split-Phase Induction Generator
(2018-11-27)
Prapurt, N.
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Sawetsakulanond, B.
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Kinnares, V.
This paper proposes power factor improvement and inrush current reduction of a 1/2 HP, 220 V, 4.8 A, 4 poles single-phase grid connected split phase induction generator by connecting a capacitor for reactive compensation and a single-phase ac voltage controller for reducing inrush current during starting of the grid connected induction generator. Analysis and comparison of generator performance between calculation with an equivalent circuit and testing in a laboratory are given. Simulation of the generator operation during starting of connection with the power system using MATLAB/Simulink is also included. From testing results, it is found that the capacitor can improve power factor but it causes an increase in harmonic currents. Soft starting of the grid connected generator with the ac voltage controller offers a reduction in the peak inrush current with 75-80% of the peak inrush current with direct on line start. The simulation results using MATLAB/Simulink are in good agreement with testing and theoretical results. The research results are guidelines for single-phase grid induction generator applications in effective electricity production.
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Low Harmonic Distortion of Input Voltage and Current of a Medium Voltage Drive for Sugar Mill Plants
(2018-11-27)
Boonseng, C.
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Rapeepornpat, B.
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Kinnares, V.
The medium voltage drive (MVD) is a high voltage alternating current variable frequency device developed and designed for the sugar mill plant in Thailand. The medium voltage drive features offer excellent performance, easy and convenient operation and a wide range of applications using IGBT power devices and complete digital control. Using multipulse input rectification transformer technology efficiently lowers the content of the grid side distortion current to less than 3%. The power cell rectifier is a regular six-pulse diode bridge. However, the phase-shift transformer is designed to combine all power cell input currents into a 24-pulse grid side current. It meets the IEEE 519-1992 standard and the strict requirements of electric grids for distortion, and enhances the power factor to more than 0.96 lagging. Finally, the comparative performances between 12-pulse, 18-pulse and 24-pulse converters are presented.
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Analysis and Investigation of the Islanding Phenomenon Problem for Grid Connected Induction Generators
(2018-11-27)
Sawetsakulanond, B.
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Kinnares, V.
This paper proposes analysis and investigation of the islanding phenomenon of a three phase, 0.75 kW, 220/380 V, 3.46/2A, Δ / Y connected, 1400 rpm, 4 pole grid connected induction generator. Analysis and investigation on grid connected induction generators under transient and steady state conditions are given. Research results will be guidelines for islanding protection equipment of grid-connected induction generators.
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Analysis and investigation on the behavior and performance of single phase grid connected induction generators system
(2017-10-02)
Nuttapong, P.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents an inrush current reduction method for a 1/2 HP (0.4 kW), 220 V, 4.8 A, 4 poles single phase split-phase type induction generator when connected to a grid using single-phase voltage control with power electronic equipment. A study and analysis of relationship between voltage, current and real power by laboratory tests under direct on line and soft connection conditions are given. Simulation and experimental results are in good agreement. According to testing results, it is found that the proposed voltage control is able to reduce 75-80 % of the inrush current when starting the connection. Research results will be guidelines in applications of effective single-phase induction generators for wind energy.
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Investigation of skew effect on the behavior and performance of grid connected induction generators
(2017-01-30)
Sawetsakulanond, B.
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Kinnares, V.
This paper proposes the investigation of skew effect on the behavior and performance of three phase, 2.2 kW, 220/380 V, Δ / Y connected, 1420 rpm, 4 poles grid connected induction generators with skewed squirrel cage rotor for supplying electric power to utility grid. Skewed rotor with angle of 0°, 5° and 10° for grid connected induction generators are employed. Analysis and comparative study on operating of induction generators under transient and steady state conditions have been performed. Research results will be guidelines for an application of wind induction generator for electricity generation.
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Implementation of FPGA and real-time processor for islanding monitoring and protection of grid connected induction generator
(2017-01-30)
Buangam, W.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents new controller using FPGA and Real-Time Processor based on LabVIEW Programming that can be detected phenomena of Induction Generator (IG) isolated from grid. Advantage of controller can be monitoring voltage, current signal and reducing effect of buildup voltage of IG after disconnecting form grid system by connecting the impedance to IG terminal. The results demonstrate that the islanding detection succeeds and to prevent damage occurrence of IG.
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Performance evaluation of three-phase induction generator operating as grid connected single-phase induction generator using electronic capacitor
(2016-01-18)
Yukhalang, S.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents performance evaluation of three-phase induction generator operating as a grid connected single phase induction generator using electronic capacitor for variable speed wind energy applications. When the existing delta connected three-phase can operate as a single-phase induction generator by voltage control techniques using electronic capacitor. The proposed converter system for the front end converter, a single-phase full bridge IGBT converter offers bidirectional power flow for the machine operates as a motor and generator modes. For the machine end converter, half bridge IGBT converter offers excitation of the generator. Comparison between one capacitor connecting an external suitable across terminals and electronic capacitor will be given. Performance evaluation like electromagnetic torque, power factor, speed, THDi for both sides of the system for variable speed of a prime mover is given by simulation using MATLAB/Simulink.
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A development design of ozone generator with a new helix coil electrode for micro bacterial disinfection in hospitals
(2015-01-26)
Potivejkul, S.
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Leejongpermpoon, S.
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Markchun, C.
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Kinnares, V.
This article presents development of a new helix coil electrode of an ozone generator for disinfection in hospital. In development of the proposed electrode, the optimal spacing between each turn of the helix coil has been investigated. The considered spaces are 1 cm, 2 cm, and 3 cm. To confirm the performance of the proposed electrode, the capability in ozone generation has been considered in an HV laboratory by comparison of ozone concentration generated by the proposed and conventional cylindrical electrodes. The helix coil electrode as an inner electrode was made from copper wire and the cylindrical electrode with radius of 1.5 cm as outer electrode was made of stainless steel. Those two electrodes are separated by air gap with gap spacing of 1 mm and glass material with thickness of 1.4 mm. The inner electrode is connected to a high voltage source and the outer one is connected to ground. In the experiment, air flow rate was set to be 20 l/hr to 150 l/hr. The applied peak high voltage with frequency of 20 kHz used in the experimental is set to be 0 to 6 kV. The experimental result show that the condition of the spacing of 2 cm, air flow rate of 50 l/hr and peak voltage of 6 kV provides the highest ozone concentration of 840 ppm. From the experimental results, it is high possibility that the developed electrode is able to use in ozone generators for micro bacterial disinfection in hospitals.
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The development of a prototype of polluted gas reducing instrument used for gasoline vehicle
(2015-01-26)
Potivejkul, S.
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Kitwattana, K.
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Udomdat, P.
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Kinnares, V.
This paper presents the development of a prototype of polluted gas reducing instrument which used for a gasoline vehicle. Effect of the electric field between electrodes in the instrument to capability in polluted gas reduction has been studied. In experiments, the electric field of 0-25 kV/cm 20kHz was varied. The revolution speed of engine was set to be 700 rpm. Electrode is wire-plan with 2 layer insulated acrylic plastic and air are 3 mm both of them. It is not necessary to use another power supply from outside the vehicle, since the battery used in the vehicle is used as a power supply of the instrument. The prototype can operate very well. The results showed that using only vehicle battery can provide energy to the electrodes to generate an electric field for reducing emission gases. Actually, it can reduce carbon monoxide, carbon dioxide and hydrocarbons by 36.3%, 21.6% and 9.1% respectively.

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