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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
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 64, Issue 12 - Dec 2015
Volume 64, Issue 11 - Nov 2015
Volume 64, Issue 10 - Oct 2015
Volume 64, Issue 9 - Sep 2015
Volume 64, Issue 8 - Aug 2015
Volume 64, Issue 7 - Jul 2015
Volume 64, Issue 6 - Jun 2015
Volume 64, Issue 5 - May 2015
Volume 64, Issue 4 - Apr 2015
Volume 64, Issue 3 - Mar 2015
Volume 64, Issue 2 - Feb 2015
Volume 64, Issue 1 - Jan 2015
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The Analysis of Trolley-Rail Short Circuit Current in a Single Track AT Feeding System
Cho, Gyu-Jung ; Ryu, Kyu-Sang ; Lee, Hun-Do ; Heo, Seung-Hun ; Kim, Chul-Hwan ; Kwon, Sung-Il ; Kim, Cheol-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1659~1665
DOI : 10.5370/KIEE.2015.64.12.1659
In general, AT(Auto-transformer) is used to improve voltage sag and inductive interference in power lines and communication lines in AC electrical railway feeding system. Especially, Korean AT feeding system has different composition compared to other countries like Japan or France, so that it has some special characteristics. However, relays imported from other countries have been used in Korea, and settings of these relays should be modified and reflect distinct characteristics of Korean AT feeding system. Therefore, study about fault analysis based on modeled AT feeding system is important. In this paper, we modeled a single track AT feeding system by using PSCAD and analyzed fault current flow in case of trolley-rail short circuit fault. Finally, we presented current magnitude of each branch expressed by boosting current of AT.
Operational Strategy for a BESS-based Microgrid
Lee, Ha-Lim ; Chun, Yeong-Han ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1666~1672
DOI : 10.5370/KIEE.2015.64.12.1666
Small islands are quite adequate places where microgrid system with renewable sources can replace diesel engines as operation costs of diesel engine in most small islands are very high. To get the large amount of renewable energy, the microgrid system has very large capacity of renewable sources. The system with large capacity of renewable sources can meet the case when supplied energy is greater than the load and the fluctuation of source output is very large. The battery energy storage system can be a solution to stabilize the system with large capacity of renewable sources. In this case, BESS can be utilized as a master source for the synchronous operation of all sources including diesel engine, wind turbine and PV. The diesel generators can be used as a backup in case the BESS SOC goes below a certain level. In this paper, we suggest a novel unit commitment of diesel generators and operation schedule of pump for water supply service with the information of wind forecast, PV forecast, and load forecast. The proposed methods has been implemented and tested at the test bed in Gasa-Island.
Magnetic Field Analysis in Accordance with Line Configuration Type in Underground Transmission Systems
Lee, Jae-Myeong ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1673~1678
DOI : 10.5370/KIEE.2015.64.12.1673
This paper describes magnetic field on power cable in underground transmission systems. Based on specification which is being used in domestic power utility, magnetic field was analyzed in accordance with line arrangement, line burial depth and phase spacing. Magnetic field magnitude and its trend were understood in each circuit type such as double circuits, triple circuits and quadruple circuits of underground transmission systems. In addition, magnetic field was analyzed according to phase arrangement changing in each circuit. Finally, the proper phase arrangement configuration type was suggested by the evaluation of analysis result. Magnetic field was calculated by using Biot-Savart's law. According to the evaluated magnetic fields based on phase layout configuration in each circuit, it figured out that each of magnetic fields was different. As a result, this paper proposes a proper phase layout configuration for generating minimum magnetic field. It is evaluated that the phase layout configuration in each circuit proposed in this paper can be used at actual underground transmission systems.
Effect of Magnetization Pattern on Partial Demagnetization of Rotary Electric Machines with Ferrite Magnets
Kim, Kwan-Ho ; Park, Hyung-Il ; You, Dae-Joon ; Jang, Seok-Myeong ; Choi, Jang-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1679~1685
DOI : 10.5370/KIEE.2015.64.12.1679
This paper examines the effect of the magnetization pattern on the partial demagnetization of a permanent magnet (PM) machine that uses a ferrite magnet. Although the use of halbach-magnetized PM (HMPM) arrays in PM machines has been dramatically increasing because of their attractive features, the demagnetization characteristics of HMPM arrays have not yet been examined. In this study, two analyses of the demagnetization characteristics of HMPM arrays and parallel magnetized PMs (PMPMs) are performed, with the demagnetization characteristics being analyzed using a finite element method. According to our results, partial demagnetization occurred dramatically in the HMPM arrays. Thus, it is important to consider the vulnerability of HMPM arrays when designing PM machines.
Characteristic Analysis on the Permanent Magnet Synchronous Motor with Segmented Phase Modular Stators
Lee, Seung-Han ; Cho, Han-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1686~1694
DOI : 10.5370/KIEE.2015.64.12.1686
Stator tooth segmentation and back-iron segmentation is key solution to easing the burden of manufacturing process of permanent magnet synchronous motor. The purpose of this paper is the design and characteristic analysis of permanent magnet synchronous motor having the segmented phase modular stators. Using by two-dimensional finite element method, the static/no-load characteristic analysis of the permanent magnet synchronous motor is performed. The analysis has been performed considering the additional air gaps between stator modules. The analysis results were experimentally verified, and the validity of the proposed analysis method and feasibility of the machine was confirmed.
Comparison of Electromagnetic Force Characteristics and Experiment of Pitching Moment in Permanent Magnet Linear Synchronous Motor According to the Moving Iron Core and Stator Topology
Lee, Seung-Han ; Cho, Han-Wook ; Khim, Gyungho ; Oh, Jeong-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1695~1702
DOI : 10.5370/KIEE.2015.64.12.1695
This paper presents the characteristic analysis and experiment of force characteristics in permanent magnet linear synchronous motor for accuracy prediction of linear motion machine tools. In particular, the pitching moment resulting from attraction force ripple has been analysed and tested. Firstly, we analysed the characteristics of detent force, attraction force, and pitching moment in permanent magnet linear synchronous motor according to the design techniques such as auxiliary teeth, chamfering, and permanent magnet skewing. In addition, we suggested the experimental set for measurement of pitching moment. Finally, the results from measurement shows the good agreement with those obtained from finite element analysis results.
Control of a Toroidal Type Rotor with a Magnetic Bearing Structure for the Gyro Actuator
Jou, Sung-Tak ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1703~1708
DOI : 10.5370/KIEE.2015.64.12.1703
This paper deals with the position and torque control of a toroidal type rotor which has a magnetic bearing structure. The proposed magnetic bearing structure supports the rotor by the repulsive forces of permanent magnets, and has a two degree of freedom for rotor position when the rotor is rotating. Permanent magnets and coils in the stator allow for a two degree of freedom control of the rotor position and torque generation by reacting with permanent magnets of the rotor. The executed gyro actuator has a number of poles such as five-phase permanent magnet motors and 10 stator coils for the rotor position control. In this study, the verification of the stability of the magnetic bearing was conducted using the equation of motion when the rotor was rotating, and the coil current commutation method for the position control and torque generation was studied. As a result, the feasibility of the proposed structure and control was verified by simulations of Finite Element Method (FEM) and experiments using the executed gyro actuator.
Seamless Transfer Method of BESS Connected by Engine Generator
Shin, Eun-Suk ; Kim, Hyun-Jun ; Kim, Kyo-Min ; Yu, Seung-Yeong ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1709~1717
DOI : 10.5370/KIEE.2015.64.12.1709
In remote islands PV (Photo Voltaic) panel with BESS (Battery Energy Storage System) supplies electric power to the customers in parallel operation with EG (Engine Generator) to save fuel consumption and to mitigate environmental load. BESS operates in voltage control mode when it supplies power to the load alone, while it operates in current control mode when it supplies power to the load in parallel with EG. This paper proposes a smooth mode change scheme from current control to voltage control of BESS by adding proper initial value to the integral part of voltage control, and a smooth mode change scheme from voltage control to current control by tracking the EG output voltage to the BESS output voltage using PLL (Phase-Locked Loop). The feasibility of proposed schemes was verified through computer simulations with PSCAD/EMTDC, and the feasibility of actual hardware system was verified by experiments with scaled prototype. It was confirmed that the proposed schemes offer a seamless operation in the stand-alone power system in remote islands.
Power Density Characteristics Analysis and Design of Magnetic Gear according to Speed for Drive Train of 10MW Offshore Wind Turbine
Kim, Chan-Ho ; Kim, Yong-Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1718~1723
DOI : 10.5370/KIEE.2015.64.12.1718
The diameter of the rotor of 2MW wind turbine is being developed by a number of companies with more than 80m, reliability and economic efficiency of the wind power generator has been improved. The need for large-scale wind turbine with excellent economy has been attracting attention because the new orders and the location of the wind turbine market has reached a limit. Technology development for enlargement of wind turbine is possible not only the improvement of energy efficiency but also reduce the construction costs per unit capacity. However, mechanical gearboxes used in wind generators have problems of wear, damage, need for lubrication oil and maintenance. Therefore, we want to configure the gearbox of a large-scale wind turbine using a magnetic gear in order to solve these problems of mechanical gearbox.
Variation in Properties of Seawater Flooded and Non-Flooded CSPE
Lee, Jeong-U ; Kim, In-Yong ; Ji, Seong-Hyun ; Jeon, Hwang-Hyun ; Shin, Yong-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1724~1729
DOI : 10.5370/KIEE.2015.64.12.1724
Chlorosulfonated polyethylene (CSPE) was not flooded seawater and flooded seawater & freshwater for 5 days, respectively, and these samples are referred to as BSF(before seawater flooding) and ASFF(after seawater & freshwater flooding), respectively. The apparent density, dissipation factor, relative permittivity, melting temperature, dielectric breakdown time and increased time of applied voltage are higher than those of BSF, but the insulating resistance, dielectric strength, percent elongation and glass transition temperature of ASFF are lower than those of BSF. The differential temperature of those is
after AC and DC voltage is applied to ASFF, respectively, and the differential temperature of those is
after AC and DC voltage is applied to BSF, respectively. In the case AC and DC voltage is applied to ASFF as well as BSF, the variations in temperature of AC voltage are higher than those of DC voltage. It is investigated that dielectric loss due to dissipation factor (
) is related to electric dipole conduction current. It is certain that the ionic (electron or hole) leakage current was increased by conducting ions such as
, those are related to cured atoms of O and S that relatively increased after seawater flooding.
A 16-channel CMOS Inverter Transimpedance Amplifier Array for 3-D Image Processing of Unmanned Vehicles
Park, Sung Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1730~1736
DOI : 10.5370/KIEE.2015.64.12.1730
This paper presents a 16-channel transimpedance amplifier (TIA) array implemented in a standard
CMOS technology for the applications of panoramic scan LADAR (PSL) systems. Since this array is the front-end circuits of the PSL systems to recover three dimensional image for unmanned vehicles, low-noise and high-gain characteristics are necessary. Thus, we propose a voltage-mode inverter TIA (I-TIA) array in this paper, of which measured results demonstrate that each channel of the array achieves
transimpedance gain, 565-MHz bandwidth for 0.5-pF photodiode capacitance, 6.7-pA/sqrt(Hz) noise current spectral density, and 33.8-mW power dissipation from a single 1.8-V supply. The measured eye-diagrams of the array confirm wide and clear eye-openings up to 1.3-Gb/s operations. Also, the optical pulse measurements estimate that the proposed 16-channel TIA array chip can detect signals within 20 meters away from the laser source. The whole chip occupies the area of
including I/O pads. For comparison, a current-mode 16-channel TIA array is also realized in the same
CMOS technology, which exploits regulated-cascode (RGC) input configuration. Measurements reveal that the I-TIA array achieves superior performance in optical pulse measurements.
A Multi-channel CMOS Feedforward Transimpedance Amplifier Array for LADAR Systems
Kim, Seung-Hoon ; Park, Sung Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1737~1741
DOI : 10.5370/KIEE.2015.64.12.1737
A multi-channel CMOS transimpedance amplifier(TIA) array is realized in a
CMOS technology for the applications of panoramic scan LADAR systems. Each channel consists of a PIN photodiode and a feed-forward TIA that exploits an inverter input stage followed by a feed-forward common-source amplifier so as to achieve lower noise and higher gain than a conventional voltage-mode inverter TIA. Measured results demonstrate that each channel achieves
transimpedance gain, 720-MHz bandwidth, and -20.5-dBm sensitivity for
BER. Also, a single channel dissipates the power dissipation of 30 mW from a single 1.8-V supply, and shows less than -33-dB crosstalk between adjacent channels.
A Transfer Alignment Method considering a Data Latency Compensation for an Inertial Navigation System in High Dynamic Applications
Lee, Hyung-Sub ; Han, Kyung-Jun ; Lee, Sang-Woo ; Yu, Myung-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1742~1747
DOI : 10.5370/KIEE.2015.64.12.1742
An improved transfer alignment method for a strap-down inertial navigation system (SDINS) is presented here. The alignment accuracy in conventional method is vulnerable to the data latency of a Master INS (MINS) in high maneuverable platforms. We propose a time delay compensation equation considering higher-order terms in the attitude measurement equation of the Kalman filter. The equation incorporates additional information including angular rate, angular acceleration and linear acceleration from the MINS. Simulation results show that the transfer alignment accuracy is significantly improved in the high dynamic environment by incorporating the latency compensation technique.
Improvement of Genetic Programming Based Nonlinear Regression Using ADF and Application for Prediction MOS of Wind Speed
Oh, Seungchul ; Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1748~1755
DOI : 10.5370/KIEE.2015.64.12.1748
A linear regression is widely used for prediction problem, but it is hard to manage an irregular nature of nonlinear system. Although nonlinear regression methods have been adopted, most of them are only fit to low and limited structure problem with small number of independent variables. However, real-world problem, such as weather prediction required complex nonlinear regression with large number of variables. GP(Genetic Programming) based evolutionary nonlinear regression method is an efficient approach to attach the challenging problem. This paper introduces the improvement of an GP based nonlinear regression method using ADF(Automatically Defined Function). It is believed ADFs allow the evolution of modular solutions and, consequently, improve the performance of the GP technique. The suggested ADF based GP nonlinear regression methods are compared with UM, MLR, and previous GP method for 3 days prediction of wind speed using MOS(Model Output Statistics) for partial South Korean regions. The UM and KLAPS data of 2007-2009, 2011-2013 years are used for experimentation.
An Adaptive Wind Noise Reduction Method Based on a priori SNR Estimation for Speech Eenhancement
Seo, Ji-Hun ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1756~1760
DOI : 10.5370/KIEE.2015.64.12.1756
This paper focuses on a priori signal to noise ratio (SNR) estimation method for the speech enhancement. There are many researches for speech enhancement with several ambient noise cancellation methods. The method based on spectral subtraction (SS) which is widely used in noise reduction has a trade-off between the performance and the distortion of the signals. So the need of adaptive method like an estimated a priori SNR being able to making a high performance and low distortion is increasing. The decision directed (DD) approach is used to determine a priori SNR in noisy speech signals. A priori SNR is estimated by using only the magnitude components and consequently follows a posteriori SNR with one frame delay. We propose a modified a priori SNR estimator and the weighted rational transfer function for speech enhancement with wind noises. The experimental result shows the performance of our proposed estimator is better Perceptual Evaluation of Speech Quality scores (PESQ, ITU-T P.862) compare to the conventional DD approach-based systems and different noise reduction methods.
Solar Tracking Performance using a Heliostat and Uniform Irradiation of LED Light for a Plant Factory
Koo, Kyung-Wan ; Kim, Tae-Jin ; Kim, Youngshik ; Ryu, Bong-Jo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1761~1767
DOI : 10.5370/KIEE.2015.64.12.1761
This paper deals with the solar tracking performance using a small heliostat, the light reduction rate of the sun light, and the performance of uniform irradiation of LED light for a plant factory. A high precision encoder is attached to the heliostat to improve tracking accuracy. As a result, our heliostat-based solar tracking systems track efficiently the movement of the sun light in experimental tests. The reduction rate of the sun light in the plant factory is then measured by using an illumination sensor. The average reduction rate is 4.29%, which represents lower light reduction rates. In uniform irradiation tests of LED light, sixteen points are measured, and overall deviations of irradiation were within eight percents.
A Study on the Deterioration Diagnosis of 600V Shielded Twisted Pair Control/Measurement Cable using Resonance Frequency
Shin, JaeYoung ; Kim, KwangHo ; Nah, WanSoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1768~1775
DOI : 10.5370/KIEE.2015.64.12.1768
Recent major domestic facilities, such as nuclear power plants, many control cables are installed and are degraded by long-term use, but research on deterioration diagnosis is lacking. In the event of a fault in the cable due to deterioration can be developed into a major accident such as the main plant is stopped, so the deterioration diagnostic techniques of high reliability for the cable is required. In this paper, proposes a methodology using a cable resonance that can effectively diagnose the deterioration of the cable. Prior to the test, we developed a setup for stable measuring the characteristics of the cable and it verified the suitable of the measurement set-up in terms of interactivity and reliability, also measured S-parameters applying verified measurement set-up to the cables that deterioration degree is different. Then, we had amplified the difference in resonance frequency between the healthy state and the deteriorated state using connection in a series of measured S-parameters. In a result from the method, we have verified that the more deteriorate the cables is, the more decrease the resonance frequency is. Measured results are justified by inducing the resonance frequency calculation of the cable from the S- parameters represented by the hyperbolic function formula. VNA(Vector Network Analyzer) for S-parameter measurements used in this study is Agilent E5061B and shielded twisted-pair cables was used for deterioration diagnostic test.
Design of DC-DC Converter to Charge and Discharge Ultra-Capacitor Modules for Wireless Trains
Jo, Jeong-Min ; Han, Young-Jae ; Kim, Jae-Won ; Lee, Jang-Moo ; Kim, Gil-Dong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1776~1781
DOI : 10.5370/KIEE.2015.64.12.1776
Electric power trains receive electric power from overhead cables via a pantograph system. Power collector system in trains increase the cross section of tunnel and require a massive coreless filter reactor in propulsion inverter because of the power disturbance by contact loss phenomenon of a train. In this paper we proposed a wireless train which can run to next station with charging energy of ultra-capacitor module block. We designed DC-DC converter to charge and discharge ultra-capacitor modules by using Next Train running test results and confirm the feasibility of the proposed system through simulation.
A Study on the Effects of Construction Tolerances on the Current Collection Performance for High Speed Catenary System
Kim, Tae-Hun ; Seo, Ki-Bum ; Park, Jae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1782~1788
DOI : 10.5370/KIEE.2015.64.12.1782
In this paper, analysis of the effects for construction tolerances on the current collection performance of high speed catenary system. The height of the contact wire is the geometrical position of the cantilever directly affects the current collection performance. Contact force when the height of the contact wire exceeds the construction tolerance were analyzed. As a result, the maximum contact force was analyzed to more than 350[N] that are recommended by EN50119. And when the geometrical position of the cantilever to exceeds the construction tolerance, the analysis results of uplift at the mast support points, it becomes 127[mm] that are recommended by UIC 799. If the construction tolerances exceeds the reference value, the current collection performance is deteriorated. Therefore, catenary system require high precision construction. In the future, there is a need for continuing research on the tolerance of catenary system in the actual operating state.
Development of a Tensioning Device for the 400km/h High-speed Overhead Contact Line
Cho, Yong Hyeon ; Lee, Kiwon ; Kwon, Sam Young ; Cho, Ho Rung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1789~1795
DOI : 10.5370/KIEE.2015.64.12.1789
The pulley-type tensioning device subjected to a maximum tension of 34 kN has been developed for 400 km/h high-speed railway. The tensioning device is to maintain the tension variation within 3% of the normal value, irregardless of temperature changes. Field tests shows that the tensioning device had a variation of tension which was as small as 0.6% as temperatures changed from
. Along with the tensions, we measured its X and Y movements due to the temperature changes. Based on a combination of its X and Y movements, we proposed a new performance index with which we can see if the tensioning device has troubles in operation without tension measurements.
Analysis on Applicability of LTE-R in Urban Railway Tunnel Environment
Kwak, Woo-Hyun ; Lee, Kwang-Hee ; Kim, Yong-Kyu ; Choi, June-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1796~1803
DOI : 10.5370/KIEE.2015.64.12.1796
Unlike commercial LTE network, LTE-R railway network is arranged along a railroad track and the base stations of the network (RUs) are also installed on the waysides. For urban railway systems that are composed of underground tunnels, the leakage coaxial cables are widely used due to the radio propagation characteristics in tunnels. In theory, the tunnel sections are interpreted as the waveguide with blank spaces and for this reason, the tunnel sections are expected to be better than open ground sections in terms of the radio propagation characteristics. In this paper, we analyze the radio propagation characteristics based on this theory by replacing the leakage coaxial cables in the network with Yagi antennas. The test has been carried out in the 2.2km tunnel in the Daebul test track of KORAIL with 2.6GHz LTE-R Network. The LTE-R applicability in urban railways has been tested through the analysis on the radio propagation characteristics with the unmanned train operation system in Daebul tunnel.
A Study on Propulsion Control Device Characteristics of Small-scale Electric Railway Vehicle according to Driving Curve Tracking using Fuel Cell Generation System
Jung, No-Geon ; Chang, Sang-Hoon ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1804~1809
DOI : 10.5370/KIEE.2015.64.12.1804
The study in railway system to apply a fuel cell system with high efficiency and mobility than other renewable energy is being actively conducted. It is needed a analysis on load characteristics and control method of rolling stock in order to apply to rolling stock. This paper presents study on control small-scale prototype power converter electric railway vehicle using fuel cell generation system. Experiment is conducted through real fuel cell generation system and reference speed applying the driving curve of the actual electric railway vehicle was applied. Also, output voltage of boost converter is controlled considering characteristic of fuel cell. And it was confirmed characteristic according to powering and regeneration of inverter.
Auxiliary Power Unit Control Algorithm for Input Voltage Disturbance Suppression
Kim, Ji-Chan ; Baek, Seoung-Gil ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1810~1817
DOI : 10.5370/KIEE.2015.64.12.1810
The railway vehicle has an auxiliary power unit for supplying power to the associated electronic control devices and passenger service unit. Typically, input voltage from the catenary for rolling stock is highly fluctuating according to the substation capacity, vehicle propulsion and regeneration. Especially, the frost and freezing on contact wire in winter can cause a blackout inside vehicle, and also brings about electronic components damaging and the system down. To prevent this problem, a large filter and capacitor is used. But this is not a perfect solution, because it is increasing weight of the unit. In this paper, a new algorithm is proposed to suppress the disturbance without adding devices. Simulation and experimental results show that the proposed algorithm has performance to suppress the disturbance at the sudden input voltage variations.
A Study on the Protection Wire Type Decision of Catenary System in the 350km/h High Speed Line
Lee, Hack-Pyo ; Seo, Ki-Bum ; Park, Jae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 12, 2015, Pages 1818~1823
DOI : 10.5370/KIEE.2015.64.12.1818
In this paper, we analyzed the optimal configuration of protection wire that have been installed in the electric railway power supply system. Protection wires are to suppress the ground potential rise when the short circuit fault between contact wire-rail(C-F), and protect the electronics equipments(signalling and communication) that are facility the wayside. The role of protection wires must be feed back quickly the fault current to the substation when a short circuit fault occurs. In this paper, we proposed that only one line to install the protection wire. Comparing how to newly proposed and existing system, most of the performance is similar. The reason is that most of the current flowing in the protection wire near the location where the fault occurred. There is no problem even if in one line for human safe and the low impedance of the return circuit in dimension to ensure the safety of the facility during the fault. To ensure safety during an fault occurs, it is sufficient even by one line. But, In the protection wire of facilities planning it is necessary to design taking into account the potential utility.