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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
Journal Basic Information
Journal DOI :
The Korean Institute of IIIuminating and Electrical Installation Engineers
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Volume & Issues
Volume 23, Issue 12 - Dec 2009
Volume 23, Issue 11 - Nov 2009
Volume 23, Issue 10 - Oct 2009
Volume 23, Issue 9 - Sep 2009
Volume 23, Issue 8 - Aug 2009
Volume 23, Issue 7 - Jul 2009
Volume 23, Issue 6 - Jun 2009
Volume 23, Issue 5 - May 2009
Volume 23, Issue 4 - Apr 2009
Volume 23, Issue 3 - Mar 2009
Volume 23, Issue 2 - Feb 2009
Volume 23, Issue 1 - Jan 2009
Selecting the target year
Evaluation on the Characteristics of Daylight Distributions of Grating Louver System in a Pair Glass by Computer Simulation
Park, Byoung-Chul ; Choi, An-Seop ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 1~9
DOI : 10.5207/JIEIE.2009.23.12.001
A recent research trend on the Daylight Responsive Dimming Systems, using available daylight for energy savings, is to integrate automated roller shading systems and venetian blind systems which are vertically controlling daylight to indoor based on sun profile angle. Therefore, this paper suggests Grating Louver System into a pair glass as a new shading system, which can control daylight vertically and horizontally. The optimized spacing of louvers, which is to block direct sunlight into a space, was calculated. And then, the system was simulated for analysis and evaluation of characteristics of daylight by Desktop Radiance 2.0.
A Color Temperature and Illuminance Controllable LED Lighting System
Kim, Hoon ; Youm, Jea-Kyoung ; Chung, Won-Sup ; Kim, Hee-Jun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 10~22
DOI : 10.5207/JIEIE.2009.23.12.010
This paper presents an LED lighting system with an LED color control algorithm that can independently change its color temperature and illuminance. To show the validity of the proposed algorithm, it is proven that its solution always exists. The proposed algorithm was applied to the control of an LED module that is composed of red, green, blue, and white (RGBW) LEDs. Its color temperature variation ranged from 3,500~7,500[
], and its illuminance ranges from 500~1,500[lux]. Within these range, the color temperature and illuminance deviations are as low as
[%] when the junction temperature of LEDs are maintained at 40[
]. In the range of 30~70[
], the measured illuminance and color temperature deviations are as low as 2.1[%] and 3.6[%], and the compensated ones are as low as 1[%] and 0.49[%], when the desired illuminance and color temperature are 1,000[lux] and 6,500[
Analysis of Property for White and RGB Multichip LED Luminaire
Jeong, Byeong-Ho ; Kim, Nam-Oh ; Kim, Deog-Goo ; Oh, Geum-Gon ; Cho, Geum-Bae ; Lee, Kang-Yoen ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 23~30
DOI : 10.5207/JIEIE.2009.23.12.023
LEDs are increasingly used for many applications including automotive, aviation, display, transportation and special lighting applications. Generally, the RGB multichip LED luminaire applied to signboard, emotional lighting system and display device and the white LED luminaire applied to general lighting system. white LED spectra for general lighting should be designed for high luminous efficacy as well as good color rendering. This paper describes characteristics of LED luminaire white LED and RGB multichip LED. Two type of LED luminaire prototype used experiment physical, electrical and optic test and performance analyzed. RGB multi-chip and phosphor-type white LED luminaire were analyzed by experiment on their color characteristics and luminous efficacy of radiation, distribution curve, and electrical characteristics. Research work is in progress to develop an improved performance for optic and electrical works well for two type of LED luminaires.
Analysis and Luminous Measurement on Architectural Outdoor Lighting of the Famous Nightscape Cities - Las Vegas, Shanghai, and Hong Kong -
Choi, An-Seop ; Jung, Yeon-Hong ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 31~40
DOI : 10.5207/JIEIE.2009.23.12.031
Tourist cities as like Las Vegas in USA, Shanghai and Hong Kong in China show various architectural outdoor lighting methodologies and techniques. For these three cities, architectural outdoor lighting methods and techniques were investigated, and the luminous values of advertising illuminants as well as the maximum and minimum luminous values on the walls were measured. Then, based on current CIE luminance standard and IES recommended luminance ratio, characteristics of architectural outdoor lighting in each city are analyzed through the absolute and relative measured luminance values.
Zero Power Control for an Attraction Type Magnetic Levitation System using Disturbance Observer
Ahn, Joon-Seon ; Yu, Sun-Jong ; Kim, Sol ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 41~47
DOI : 10.5207/JIEIE.2009.23.12.041
In this paper, authors performed improvement of control characteristics of an attraction type magnetic levitation system. The attraction type magnetic levitation system has an inherent instability in the system, therefore its controller must have not only proportional-integral gain but also differential gain additionally. In this paper, authors were proposed control algorithm using disturbance observer(DOB) on feedback signal. The computer simulation and experiments were performed for its verification.
Optimal Design of Direct-Driven Wind Generator Using Mesh Adaptive Direct Search(MADS)
Park, Ji-Seong ; An, Young-Jun ; Lee, Cheol-Gyun ; Kim, Jong-Wook ; Jung, Sang-Yong ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 48~57
DOI : 10.5207/JIEIE.2009.23.12.048
This paper presents optimal design of direct-driven PM wind generator using MADS (Mesh Adaptive Direct Search). Optimal design of the direct-driven PM Wind Generator, combined with MADS and FEM (Finite Element Method), has been performed to maximize the Annual Energy Production (AEP) over the whole wind speed characterized by the statistical model of the wind speed distribution. In particular, the newly applied MADS contributes to reducing the computation time when compared with Genetic Algorithm (GA) implemented with the parallel computing method.
The Service Voltage Measurement and Analysis while TTX Runs
Lee, Su-Gil ; Kang, Chul ; Her, Jae-Sern ; Kim, Jae-Chul ; Lim, Jae-Chan ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 58~65
DOI : 10.5207/JIEIE.2009.23.12.058
Recently, the Korea Tilting Express(TTX), "HANVIT 200", KRRI(Korea Railroad Research Institute) developed runs for test on the conventional railroad, Honam line, Center line, Chunk-buk line and Tae-baek line. In this paper, we measured the service voltage while TTX ran on the conventional railroad and analyzed the condition of voltage. For measuring voltage directly, we installed PT under the pantograph and measured the voltage of the primary winding. In addition, we record situations that other trains pass by TTX and environments while TTX ran. And then we analyzed the condition of voltage using the records and CBEMA curve. In result, over 110[%] voltage of rated voltage(25[kV]) often occurred and the voltage of some place continued over 110[%] for about 200[s]. Especially, the voltage condition of Tae-baek line is the worst. The results in this paper can help to stabilize the power device and power converter of TTX.
The Research in Rationalization of the use of Energy in Electric Power
Kim, Man-Kook ; Nam, Si-Bok ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 66~74
DOI : 10.5207/JIEIE.2009.23.12.066
This study investigated and analyzed electrical energy curtailment effect by each business department and by energy use efficiency elevation equipment because do an energy use plan that is enforced in each variety business that is developed in domestic by model. When plan the recent electrical energy use with this, I wish to contribute in energy use general planning establishment improvement that is aiming energy efficiency improvement newly by groping improvement plan moment deduce problem. Specially, search present condition and problem by electrical energy curtailment equipment application that probes mass and analyzed, and is applied in present our country according to analysis contents to the latest energy use plan that was enforced on energy use rationality narration but allowed purpose.
Summer, A Study on Characteristic by Photovoltaic Module by Climate Fluctuation
Choi, Hong-Kyoo ; Choi, Shin-Gwon ; Choi, Dae-Won ; Lee, Guen-Moo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 75~82
DOI : 10.5207/JIEIE.2009.23.12.075
In this thesis, presented module choice plan that analyze relation with weather condition (work trillion amounts, mean air temperature, precipitation, cloudiness, wind speed etc.) because diagnoses June output amount of 247.5[kW] bulk type module and a-Si type module that is established in equal environment in our country and is the high effectiveness enemy more by climate fluctuation by latest global warming back.
A Study on the Analysis of Efficiency for Underground Distribution Equipment by Installment Ways
Kim, Joon-Eel ; Kim, Dong-Myung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 83~89
DOI : 10.5207/JIEIE.2009.23.12.083
The environment of electrical power industry is now faced on problems such as electric rates, an increasing sensitivity in society with environmental issues and energy factors. Up to now, reliability is greatly influenced by maintenance and environmental factors that are unique to the electric utilities. The reliability is a characteristic assigned to the electric power systems`s function which is related to the concept of installment of equipment. Therefore this reports`s key finding is that it is important that the utilities track their individual components` value over investment expense of their installed components. This can be accomplished to consider the cases of foreign electric power companies and take into account the various possible installment ways of equipment in Korea. These results are expected to be used as a reference material for design underground distribution facilities and future applications.
Current Limiting Characteristics due to Application Location of a Superconducting Fault Current Limiter in a Simulated Power Distribution System
You, Il-Kyoung ; Kim, Jin-Seok ; Kim, Myoung-Hoo ; Kim, Jae-Chul ; Lim, Sung-Hun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 90~95
DOI : 10.5207/JIEIE.2009.23.12.090
The application of a large power transformer into a power distribution system was inevitable due to the increase of power demand and distributed generation. However, the decrease of the power transformer‘s impedance causes the short-circuit current of the power distribution system to increase and thus, the higher short-circuit current exceeds the cut-off ratings of the protective devices such as a circuit breaker. To solve these problems, several countermeasures have been proposed to protect the power system effectively from the higher fault current and the superconducting fault current limiter (SFCL) has been expected to be the promising countermeasure. However, the current limiting effect of SFCL including its bus voltage drop compensation depends on SFCL`s application location in a distributed power system. In this paper, the current limiting and the bus-voltage drop compensating characteristics of the SFCL applied into a power distribution system were studied. In addition, the quench and the recovery characteristics of the SFCLs in each location of the power distribution system were compared each other.
A Study on the Photovoltaic Array Optimal Arrangement Considering Power Output
Choi, Hong-Kyoo ; Choi, Dae-Won ; Yoo, Hai-Chool ; Choi, Shin-Gwon ; Kim, Young-Kyu ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 96~105
DOI : 10.5207/JIEIE.2009.23.12.096
Photovoltaic array distance will be calculated that can have maximum output through the rearrangement of photovoltaic array by comparing and analyzing the power output decrease from the shadows of photovoltaic arrays according to the consideration of incidence angle that is not suitable to the situation of our country among the causes of power output decrease by sampling photovoltaic power generation plants. When relocate simulation result photovoltaic array 1 line, when relocate about 2.8[%], photovoltaic array 3 lines when relocate about 1.2[%], photovoltaic array 2 lines, output of about 5.0[%] improved. Also, gained space gains of photovoltaic array party 1.29[m] when relocate photovoltaic array party 0.82[m], 3 lines when relocate photovoltaic array party 0.39[m], 2 lines when relocate 1 line. As gains occur on photovoltaic array clearance, time that receive effect of shade was slowed down gradually and showed result that elevation of output shows finally.
Development of Economic based Optimal Operation Program for Microgrid
Lee, Hak-Ju ; Cha, Woo-Ku ; Song, Il-Kun ; Yoon, Yong-Tae ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 106~114
DOI : 10.5207/JIEIE.2009.23.12.106
This paper addresses unit commitment for microgrid optimization including renewable energy sources, working under deregulated power market. As microgrid supplies both heat and electricity for consumer, operational optimization must be done to meet their demand economically. So renewable energy sources are considered to be negative load, and batteries are used as the load flattening device to raise possibly operational function. In the state of solution, the program is developed to solve out the maximum profit of microgrid using dynamic programming method. Finally, its validity is verified through case study in isolation mode and interconnected mode. The S/W will be used to operate microgrid economically after the market of microgrid is formed.
Horizontal Displacement Analysis of Electric Pole from Full Scale Pull-Out Test in Softground
Ahn, Tae-Bong ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 115~126
DOI : 10.5207/JIEIE.2009.23.12.115
Many electric poles in the softground have been collapsed due to external load such as typhoon wind load. In this study, the location, numbers and depths of acnchor blocks as well as depth of poles were varied to find horizontal displacement of poles through pull-out tests. The 10 types of tests were performed, and lateral displacements showed differences depending on location, numbers and depth of poles. The bending is generated in the upper part at the initial load, but it moved to central part as load increased. The maximum horizontal displacement decreased to 1/1.6 at -0.5[m] depth of anchor block and 1.3[m] additional laying depth of poles into ground. Two anchor blocks of poles are better than one acnchor block system, but one anchor block system is recommended because difference of displacement is not too large, and constructibilty is bad due to increase of excavation for anchor blocks.
A Study on the Efficiency of Intereaved AC/DC Converter using Voltage-Doubler
Seo, Sang-Hwa ; Bae, Jin-Yong ; Kwon, Soon-Do ; Eom, Tae-Min ; Kim, Yong ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 127~135
DOI : 10.5207/JIEIE.2009.23.12.127
In this paper, the Interleaved AC/DC boost converter using two inductor with voltage-doubler characteristic when it operates with a duty cycle greater than 0.5 is proposed. Generally, the low-line(Input AC 110[V]) operation of the AC/DC boost converter is much less efficient than high-line (Input AC 220[V]) operation. The proposed Interleaved AC/DC boost converter operates as a voltage doubler at low-line. Its low-line range have higher power factor and improved efficiency compared with that of conventional converter. This research proposed the Interleaved AC/DC boost converter for voltage-doubler characteristic. The principle of operation, feature and design considerations is illustrated and the validity of verified through the experiment with a 300[W] based experimental circuit.
Modeling of SVPWM and Control Method for Driving Systems of High-speed Trains by using Multi-level Power Converters
Lee, Dong-Myung ; Hong, Chan-Hee ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 136~145
DOI : 10.5207/JIEIE.2009.23.12.136
This paper proposes control methods and simulation models of a driving system, which consists of converters and inverters, for high speed trains employing multi-level power converters. The control method of a single phase three-level converter for high-speed trains is designed to use DC values instead of instantaneous current values which are usually used in single-phase application, so that it results in a fast and robust voltage control response. In addition, simulation models of Space Vector Pulse Width Modulation (SVPWM) for single phase three-level converters as well as three level inverters are proposed. Experimental results demonstrate the validity of the simulation model for three-level inverters.
Evaluation of the Accuracy of Grounding Impedance Measurement of Grounding Grid
Choi, Jong-Hyuk ; Choi, Young-Chul ; Jeong, Dong-Cheol ; Kim, Dong-Seong ; Lee, Bok-Hee ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 146~153
DOI : 10.5207/JIEIE.2009.23.12.146
Recently, the common grounding systems are adapted in most large structures. Since the ground resistance is insufficient to evaluate the performance of grounding systems, it is needed to measure grounding impedance. Even though the methods of measuring grounding impedance of large grounding systems are presented in IEEE standard 81.2, but they have not been described in detail. In this paper, we present the accurate method of measuring grounding impedance based on the revised fall-of-potential method and measurement errors due to earth mutual resistance and ac mutual coupling depending on locating test electrodes at remote earth were examined for the 15[m]
15[m] grounding grid. As a result, the measurement error due to earth mutual resistance is decreased when the distance to auxiliary electrodes increased. To get rid of measurement errors due to mutual coupling, the potential lead should be installed at a right angle to the current lead. When the angle between the potential and the current leads is an acute angle or an obtuse angle, the mutual couple voltage is positive or negative, respectively. Generally, the measurement errors due to mutual coupling with an obtuse angle route are lower than those with an acute angle route.
An Intelligent Control Method for Optimal Operation of a Fuel Cell Power System
Hwang, Jin-Kwon ; Choi, Tae-Il ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 154~161
DOI : 10.5207/JIEIE.2009.23.12.154
A fuel cell power plant is a very complex system which has various control loops with some non-linearity. For control of a fuel cell power plant, dynamic models of fuel cell stacks have been developed and simplified process flow diagrams of a fuel cell power plant has been presented. Using such a model of a Molten Carbonate Fuel Cell (MCFC) power plant, this paper deals with development of an intelligent setpoint reference governor (I-SRG) to find the optimal setpoints and feed forward control inputs for the plant power demand. The I-SRG is implemented with neural network by using Particle Swarm Optimization (PSO) algorithm based on system constraints and performance objectives. The feasibility of the I-SRG is shown through simulation of an MCFC power plant for tracking control of its power demand.
A Study on Insulation Performance Enhancement of Existing Transmission Line Considering Overvoltage Analysis Result and Fault Characteristic
Kwak, Joo-Sik ; Woo, Jung-Woog ; Koo, Kyo-Sun ; Kim, Kyung-Tak ; Kweon, Dong-Jin ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 162~168
DOI : 10.5207/JIEIE.2009.23.12.162
This paper describes a study that is to redesign insulation of transmission lines and determine required the numbers of insulators in order to enhance the insulation performance of existing transmission lines which were constructed with standard insulation design, considering overvoltage analysis results, probabilities and characteristics of faults. To ensure proper insulation distance without deteriorating the required performance, EMTP model is established to calculate maximum overvoltage in the line. The fault records and predicted outage rates due to lightning and contamination in the line were investigated and analyzed respectively. It presents a method to determine the numbers of insulators considering the probability and the characteristic of fault.
Analysis of Influence Factors of Interaction on the Electric Power of Microbial Fuel Cell
Lee, Song-Keun ; Kim, Il-Ju ; Lee, Kyu-Hwa ; Yoo, Kyu-Seon ; Song, Young-Chae ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 169~175
DOI : 10.5207/JIEIE.2009.23.12.169
Microbial fuel cell (MFC) is a device to produce a electricity from the oxidation of organic materials using microorganism. Recently many researchers have been studying MFC which is focused as regeneration energy source. Previews studies have focused every each factor that influence the production of electric power. However they didn`t study a lot about the correlation among the factors. In order to improve the MFC, we analysed the factors which influencing the generation of electric power of MFC. Also, we made a new compartment to verify the correlations among the factors efficiently. Based on the result obtained from the experiments in the laboratory, we analysed the factors and we suggested a new concept of waste water treatment system to produce electrical energy during the treatment of waste water.
The Energy Performance & Economy Efficiency Evaluation of Microturbine Installed in Hospital buildings
Kim, Byung-Soo ; Gil, Young-Wok ; Hong, Won-Pyo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 176~183
DOI : 10.5207/JIEIE.2009.23.12.176
Distributed generation(DG) of combined cooling, heat, and power(CCHP)has been gaining momentum in recent year as efficient, secure alternative for meeting increasing energy demands. This paper presents the energy performance of microturbine CCHP system equipped with an absorption chiller by modelling it in hospital building. The orders of study were as following. 1)The list and schedule of energy consumption equipment in hospital were examined such as heating and cooling machine, light etc. 2) Annual report of energy usage and monitoring data were examined as heating, cooling, DHW, lighting, etc. 3) The weather data in 2007 was used for simulation and was arranged by meteorological office data in Daejeon. 4) Reference simulation model was built by comparison of real energy consumption and simulation result by TRNSYS and ESP-r. The energy consumption pattern of building were analyzed by simulation model and energy reduction rate were calculated over the cogeneration. As a result of this study, power generation efficiency of turbine was about 30[%] after installing micro gas turbine and lighting energy as well as total electricity consumption can be reduced by 40[%]. If electricity energy and waste heat in turbine are used, 56[%] of heating energy and 67[%] of cooling energy can be reduced respectively, and total system efficiency can be increased up to 70[%].
The Surface Energy Change of TAC Film Treated by an Atmospheric Pressure Plasma
Lee, Chang-Ho ; Jung, Do-Young ; Park, Young-Jik ; Song, Hyun-Jig ; Lee, Kwang-Sik ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 184~190
DOI : 10.5207/JIEIE.2009.23.12.184
Tri-acetyl-cellulose(TAC) film surface was modified by atmospheric-pressure plasma technique to obtain the hydrophilic functional groups and improve the contact angle. TAC film was modified with N2 plasma ionized in dielectric barrier discharge(DBD) reactor under atmospheric pressure. We measured the change of the contact angle and the surface energy with respect to the plasma treatment conditions such as plasma treatment power, discharge gap and Ｎ2 gas flow rate. As the plasma treatment speed of 100[mm/sec], the plasma treatment power of 1.5[kW], discharge gap 2[mm] and the
gas flow rate 140[LPM], the best contact angle and the highest surface energy were obtained. The degree of hydrophilization depended strongly on the plasma-treating time and discharge power.
A Tuning Method for the Power System Stabilizer of a Large Thermal Power Plant and Its Application to Real Power System : Part I-Selection of Parameters by Off-line Simulation
Shin, Jeong-Hoon ; Lee, Jae-Gul ; Nam, Su-Chul ; Choy, Young-Do ; Kim, Tae-Kyun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 191~200
DOI : 10.5207/JIEIE.2009.23.12.191
This paper, which consists of two parts, dealt with the parameter tuning of the power system stabilizer for a 612[MVA] thermal power plant in KEPCO system and its validation in field test. In Part 1 of the paper, the selection of parameters such as lead-lag time constants for phase compensation, system gain was optimized by using linear & eigenvalue analyses and they were verified through the time-domain transient stability analysis. In part 2, the performance of PSS was finally verified by the generator`s on-line field test. Through the comparisons of simulation results and measured data before and after tuning of the PSS, the models of generator and its controllers including AVR, Governor and PSS used in the simulation are validated and confirmed.
A Sensor Value Validation Technique for Supporting Stable Operations of Thermal Power Plants
Lee, Seung-Chul ; Kim, Seung-Jin ; Han, Seung-Woo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 201~209
DOI : 10.5207/JIEIE.2009.23.12.201
In power plant operations, sensor values often exhibit erroneous values due to their failures or the intrusions of various noises. However, most of the power plant monitoring and fault diagnosis systems perform their tasks based on the assumptions that the collected sensor values are correct all the times. These assumptions, which are not valid, often lead to serious consequences such as power plant trips. In this paper, we propose a power plant sensor value validation technique that can utilize the relationships existing among the sensor values as the sensor redundancy. The proposed technique is applied to the flow meters installed along boiler feed water systems of a typical tubular type boiler thermal power plant and shows a good potential of future applications.
Dynamic Model of Microturbine Generation System for Stand-Alone Mode Operation
Cho, Jea-Hoon ; Hong, Won-Pyo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 210~216
DOI : 10.5207/JIEIE.2009.23.12.210
Distributed Generation (DG) is predicted to play a important role in electric power system in the near future. insertion of DG system into existing distribution network has great impact on real-time system operation and planning. It is widely accepted that micro turbine generation (MTG) systems are currently attracting lot of attention to meet customers need in the distributed power generation market. In order to investigate the performance of MT generation systems, their efficient modeling is required. This paper presents the modeling and simulation of a MT generation system suitable for stand-alone operation. The system comprises of a permanent magnet synchronous generator driven by a MT. A brief description of the overall system is given, and mathematical models for the MT and permanent magnet synchronous generator are presented. Also, the use of power electronics in conditioning the power output of the generating system is demonstrated. Simulation studies with MATLAB/Simulink have been carried out in stand-alone operation mode of a DG system.
A Study on Characteristic for a Maximum Utilization Factor of Transformer with Regard to Load Characteristics in General Customers
Kim, Se-Dong ; Wang, Yong-Peel ; Hong, Hyun-Mun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 217~223
DOI : 10.5207/JIEIE.2009.23.12.217
This paper shows a reasonable contract power conversion factor, that was made by the systematic and statistical way considering actual conditions, such as investigated contract power and peak power for the last 5 years of each customer for 461 general customers as to AMR. In this dissertation, it is necessary to analyze the key features and general trend from the investigated data. It made an analysis of the feature parameters, such as average, standard deviation, median, maximum, minimun and thus it was carried by the linear and nonlinear regression analysis. Therefore, this paper compared characteristics for a contract power conversion factor which is applied to estimate contract power with characteristics for a regression model for customers(office, store, hotel, hospital, wedding hall) which maximum utilization factor of transformer is more than 60[%].
Development of a Data Structure for Effective Monitoring of Power Plant Start-up Sequences
Lee, Seung-Chul ; Han, Seung-Woo ; Kim, Seung-Jin ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 23, issue 12, 2009, Pages 224~232
DOI : 10.5207/JIEIE.2009.23.12.224
Power plant start-up is a complicate process involving hundreds of operations that should be performed either automatically or manually. Several major operations should be proceeded in parallel and each major operation is again broken down into detailed operations that must be carried out in a strict sequence. Even though most of the operations are automated, still substantial portions of the operations are carried out manually and the operational status should be monitored by the crew members, which are quite stressful tasks to be performed in real time. In this paper, a data structure called an Event Sequence Monitoring Graph(ESMG) is proposed for monitoring a sequence of events involved in the power plant start-up process. The ESMG is currently being applied to a thermal power plant with a rated output of 500MW. An application example is shown with the boiler feed water pump system start-up process, which exhibits a good potential for future applications.