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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Electrical Engineers P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 61, Issue 4 - Dec 2012
Volume 61, Issue 3 - Sep 2012
Volume 61, Issue 2 - Jun 2012
Volume 61, Issue 1 - Mar 2012
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The Development of Boiler Combustion Air Control Algorithm for Coal-Fired Power Plant
Lim, Gun-Pyo ; Lee, Heung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 153~160
DOI : 10.5370/KIEEP.2012.61.4.153
This paper is written for the development of boiler combustion air control algorithm of coal-fired power plant by the steps of design, coding and test. The control algorithms were designed in the shape of cascade control for two parts of air master, forced draft fan pitch blade by standard function blocks. This control algorithms were coded to the control programs of distributed control systems under development. The simulator for coal-fired power plant was used in the test step and automatic control, sequence control and emergency stop tests were performed successfully like the tests of the actual power plant. The reliability will be obtained enough to apply to actual site if the total test has been completed in the state that all algorithms were linked mutually. It is expected that the project result will contribute to the safe operation of domestic power plant and the self-reliance of coal-fired power plant control technique.
The Stable Adaptive Converter Control Method of Photovoltaic Power Systems using Lyapunov Redesign Approach
Cho, Hyun-Cheol ; Park, Ji-Ho ; Kim, Dong-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 161~167
DOI : 10.5370/KIEEP.2012.61.4.161
Energy conversion systems such as power inverters and converters are basically significant in establishing photovoltaic power systems to enhance power effectiveness. This paper proposes a new converter control method by using the Lyapunov redesign approach. We construct the proposed control mechanism linearly composed of nominal control and auxiliary control laws. The former is generally designed through a well-known power electronic technology and the latter is implemented to compensate real-time control error due to uncertain natures of converter systems in practice. For realizing adaptive control capability in the proposed control mechanism, a control parameter vector is estimated by utilizing a steepest descent based optimization method. We carry out numerical simulation with Matlab(c) software to demonstrate reliability of the proposed converter control system and conduct a comparative study to prove its superiority by comparing with a generic converter control methodology.
A New Load Aggregation Method in Consideration of Non-linear Load
Lee, Jong-Pil ; Kim, Sung-Soo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 168~173
DOI : 10.5370/KIEEP.2012.61.4.168
The aggregation of group loads, which consists of the linear and the non-linear systems, yields the error involved in the reactive power aggregation, which is greater than the active power aggregation in the component based load modeling. Each individual reactive power in a group load affects the aggregated load different from composition rate. This paper proposes a new method that determines the degree of impacts by adjusting the coefficient of weight factors of each load using the least squares error method. The effectiveness of proposed algorithm is demonstrated by simulating three aggregation cases.
Development of Dynamic Frequency Monitoring Software for Wide-Area Protection Relaying Intelligence
Kim, Yoon-Sang ; Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 174~179
DOI : 10.5370/KIEEP.2012.61.4.174
The social and economic level of damages might be highly increased in the case of wide-area black-outages, because of heavy dependence of electricity. Therefore, the development of a wide-area protection relay intelligence techniques is required to prevent massive power outages and minimize the impact strength at failure. The frequency monitoring and prediction for wide-area protection relaying intelligence has been considered as an important technology. In this paper, a network-based frequency monitoring system developed for wide-area protection relay intelligence is presented. In addition, conventional techniques for frequency estimation are compared, and a method for advanced frequency estimation and measurement to improve the precision is proposed. Finally, an integrated monitoring system called K-FNET(Korea-Frequency Monitoring Network) is implemented based on the GPS and various energy monitoring cases are studied.
Dynamic Characteristic Analysis of Water-Turbine Generator Control System of Sihwa Tidal Power Plant
Ahn, Sang-Ji ; Ban, Yu-Hyeon ; Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 180~185
DOI : 10.5370/KIEEP.2012.61.4.180
Tidal power is one of new and renewable energy sources. The seawater is stored inside a tidal embankment built at the mouth of a river or bay, where tides ebb and flow. The water turbine-generators produce power by exploiting the gap in the water level between the water outside and inside the embankment. Tidal power plant is a large plant that is installed on the sea. And then, the facility's operations and a separate control system for monitoring and maintenance is required. However, this plant predictive control of building systems and technologies have been avoided the transfer of technology from advanced global companies. Accordingly, the control system for core technology development and localization is urgently needed. This paper presents modeling and simulation using by PSS/E about generator, governor, exciter, and power system stabilizer for control system in Sihwa tidal power plant to improve the efficiency and develope of core technology. And the dynamic characteristics of governor and exciter were analyzed.
Characteristic Investigation of External Parameters for Fault Diagnosis Reference Model Input of DC Electrolytic Capacitor
Park, Jong-Chan ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 186~191
DOI : 10.5370/KIEEP.2012.61.4.186
DC Bus Electrolytic capacitors have been widely used in power conversion system because they can achieve high capacitance and voltage ratings with volumetric efficiency and low cost. This type of capacitors have been traditionally used for filtering, voltage smoothing, by-pass and other many applications in power conversion circuits requiring a cost effective and volumetric efficiency components. Unfortunately, electrolytic capacitors are some of the weakest components in power electronic converter. Many papers have proposed different methods or algorithms to determinate the ESR and/or capacitance C for fault diagnosis of the electrolytic capacitor. However, both ESR and C vary with frequency and temperature. Accurate knowledge of both values at the capacitors operating conditions is essential to achieve the best reference data of fault judgement. According to parameter analysis, the capacitance increases with temperature and the ESR decreases. Higher frequencies make the ESR and C to decrease. Analysis results show that the proposed electrolytic capacitor parameter estimation technique can be applied to reference signal of capacitor diagnosis systems successfully.
DC Link Switch Loss Analyses according to Circuit Structures of the Boost Converter for Photovoltaic Generation System
Lee, Seung-Yo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 192~198
DOI : 10.5370/KIEEP.2012.61.4.192
Switch losses directly affect the efficiency of power conversion systems and those have big differences according to the power consumed by load systems and the structures of power conversion circuits. In this paper, analyses for switch losses in DC link converter are performed based on the circuit structures of the DC/DC converter in photovoltaic generation system whose output power is varied according to the amount of solar radiation, temperature and partial shade on the solar modules. Boost converter is adopted as a DC link converter topology of the photovoltaic generation system and the loss analyses for the switches used in the boost converters are performed according to the circuit structures. Analyses like the things performed in this paper will be a prerequisite to designing the photovoltaic generation system whose output power is changed according to the environmental variations.
Parameters Estimation of Five-phase Squirrel-Cage Induction Motor
Kim, Min-Huei ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 199~205
DOI : 10.5370/KIEEP.2012.61.4.199
This paper propose a improved parameter estimations of five-phase squirrel-cage induction motor(IM) for speed control system on field oriented control(FOC). In order to high performance control of ac the motors using a FOC and DTC(direct torque control) algorithm, there are required precise motor parameters for slip calculation, flux observer, controller gain, rotor position and speed estimation, and so on. We are suggest a estimation method of the motor parameters that developing five-phase squirrel-cage IM have a stator of concentrated winding for experimental. There are results of stator winding test, no-load test, locked rotor test, and obtained equivalent circuits using manufactured experimental apparatus. For presenting the superior performance of the speed control system in adapted the parameters, experimental results are presented using a 32-bit fixed point TMS320F2812 DSP with 1.5[KW] IM.
A Vector Control System for Five-Phase Squirrel-Cage Induction Motor Considering Effects of 3rd Current Harmonics Component
Kim, Min-Huei ; Kim, Nam-Hun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 206~213
DOI : 10.5370/KIEEP.2012.61.4.206
This paper propose a improved speed control system for five-phase squirrel-cage induction motor(IM) considering effects of 3rd. harmonic current components with field oriented control(FOC) A five-phase IM drives present unique characteristics due to the additional degrees of freedom and also drives possess many others advantage compared with the traditional three-phase motor drive system, such as reducing a amplitude of torque pulsation at low frequency and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings. The produced back-electromotive force is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents. There is necessary to controlled 3rd harmonic current. For presenting the superior performance of the proposed the speed control system, experimental results are presented using a 32-bit fixed point TMS320F2812 DSP with 1.5[KW] induction motor.
Analysis of Operation Characteristics of OCR and Recloser in Power Distribution System with SFCL
Moon, Jong-Fil ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 214~219
DOI : 10.5370/KIEEP.2012.61.4.214
In this paper, the method of protective coordination is studied to install Superconducting Fault Current Limiter (SFCL) to power distribution system. If SFCL is installed, the protective coordination is not operated well because of the decreased fault current. Thus, the resetting method of protective devices is presented to coordinate protection system in power distribution system with resistor-type SFCL. The presented methods are divided into three parts; OCR, OCR-Recloser, OCR-Recloser-Recloser. The presented methods are proved through case studies using PSCAD/EMTDC simulation.
A Study on the Characteristics of the Electric Field and Electromagnetic Loss according to Bus Bar Size for a cost-effective 24kV High Voltage Switchgear
Hong, Jonggi ; Heo, Jeong Il ; Nam, Seokho ; Kang, Hyoungku ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 220~224
DOI : 10.5370/KIEEP.2012.61.4.220
The analysis on the bus bar effect is conducted to develop a cost effective 24kV/2,000A switchgear. The temperature enclosures and bus bars could rise due to several heat sources such as eddy current losses and copper losses. Therefore, a study on the characteristics of the electric field intensity and electromagnetic loss according to the bus bar size in a bus bar compartment is essential to design a electrically reliable high voltage switchgear. It is investigated that the electromagnetic influence to the temperature rising and the dielectric stability according to various bus bar sizes by using finite element method(FEM). The electric field intensity and electromagnetic loss according to various bus bar sizes are calculated to design a reliable and a high voltage switchgear. As results, it is found that the electromagnetic loss and the dielectric stability of bus bar could be determined by a bus bar size. It means that a cost effective 24kV/2,000A high voltage switchgear could be developed by selecting the proper size of a bus bar. Also, it is recognized that the electromagnetic characteristics according to various bus bar sizes in order to design an electrically stable high voltage switchgear when the enclosure size is determined as a fixed value. Futhermore, studies on the various nominal voltage class and bus bar sizes will be conducted to develop a cost effective high voltage switchgear.
Groove manufacturing for Fluid and Aero Dynamic Bearings using Chemical Etching
Lee, Yong-Geun ; Kim, Sang-Uk ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 225~227
DOI : 10.5370/KIEEP.2012.61.4.225
This paper presents a chemical etching system for groove manufacturing for the fluid and aero dynamic bearings. To manufacture the grooves to thrust and journal surface of the fluid and aero dynamic bearing, it is very important for grooves' depth to be smaller tolerance. It is very difficult for the internal surface of journal bearing to make the grooves precise. If the precision of the groove is not exact, we can not get the desirable performance for the target of the dynamic bearing. To make the groove of bearing precise, we propose the method of chemical etching system. It has known that the method of chemical etching can not make the groove on the internal surface of journal bearing excepts for on the surface of thrust bearing. However, this paper has shown the solution to make the grooves on it. We obtain the condition and the parameters of the system such as time, chemical material composition and so on. In this paper, we get the experimental results to verify the precise groove manufacturing for the fluid and aero dynamic bearing.
A Monitoring Algorithm using FCM and ELM for Power Transformer
Ji, Pyeong-Shik ; Lim, Jae-Yoon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 228~233
DOI : 10.5370/KIEEP.2012.61.4.228
In power system, substation facilities have become too complex and larger according to an extended power system. Also, customers require the high quality of electrical power system. However, some facilities become old and often break down unexpectedly. The unexpected failure may cause a break in power system and loss of profits. Therefore it is important to prevent abrupt faults by monitoring the condition of power systems. Among the various power facilities, power transformers play an important role in the transmission and distribution systems. In this research, we develop intelligent diagnosis technique for monitoring of power transformer by FCM(Fuzzy c-means) and ELM(Extreme Learning Machine). The proposed technique make it possible to diagnosis the faults occurred in transformer. To demonstrate the validity of proposed method, various experiments are performed and their results are presented.
Multiplexed Space-Frequency Block Coding technique for Single-Carrier Modulation with Frequency Domain Equalization
Jung, Hyeok Koo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 234~238
DOI : 10.5370/KIEEP.2012.61.4.234
This paper proposes a multiplexed space-frequency block coding (SFBC) technique for single-carrier modulation with frequency domain equalization. Multiplexed space-frequency block coding technique for single-carrier modulation uses multiple groups of two transmitters and suppresses the interference signals of other SFBC groups at the receiver. In this paper, we reconfigure transmit signals to adapt them for multiplexed SFBC for single-carrier modulation with frequency domain equalization and receiver structures and propose a structure for transmitter and receiver, show its performance is better than the traditional algorithm by simulations.
Implementation of Wireless Distribution Automation System using Binary CDMA Technology
Kwon, Tai-Kil ; Cho, Jin-Woong ; Hong, Dae-Ki ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 61, issue 4, 2012, Pages 239~244
DOI : 10.5370/KIEEP.2012.61.4.239
In this paper, we first introduce our own binary CDMA technology. Then we propose a wireless distribution automation system using the binary CDMA technology. The major research items are the binary CDMA distribution automation system, piconet configuration for remote control and monitoring, scheduling for the transmission and reception of data, and ways of applying encryption to protect wireless packet. To verify the possibility of applying wireless transmission to the distribution automation system, we experiment the implemented system in terms of the transmission rate by applying it to a real-world environment.