Mobile QR Code QR CODE : The Transactions P of the Korean Institute of Electrical Engineers
The Transactions P of the Korean Institute of Electrical Engineers

The Transactions P of the Korean Institute of Electrical Engineers

ISO Journal TitleTrans. P of KIEE
  • Indexed by
    Korea Citation Index(KCI)

50 마력 유도기의 전동기 운전 및 발전기 운전시의 특성 분석 Characteristics Analysis of 50 ? Induction Motor Operation and Generator Operation

김종겸(Jong-Gyeum Kim)

The induction machine can be operated with a motor or a generator before and after the synchronous speed. The induction machine uses the same equivalent circuit diagram for both the motor and the generator. Therefore, the value obtained through the factory test can be applied as a parameter of the same equivalent circuit diagram. The output of the induction motor corresponds to 100% operation of the load connected to the shaft at the rated rotation speed, but the output of the induction generator corresponds to the active power obtained through the stator by mechanical input to the shaft. Therefore, even with the same equivalent circuit, the efficiency may be different because the electric power is different when operating with a motor or a generator. In this study, we analyzed the efficiency with input power by voltage and current and mechanical output by angular speed and torque when driving a motor with a 50? induction machine, and also the efficiency of stator electrical output for mechanical input during generator operation also analyzed.

반도체 센서를 이용한 라돈측정기의 구현 Implementation of Radon Measurement Apparatus Using Semiconductor Sensors

윤성현(Sung-Hyun Youn) ; 임충혁(Choong-Hyuk Yim) ; 김규식(Gyu-Sik Kim) ; 정재원(Jai-Won Chung)

Radon is a naturally occurring radioactive gas. It is colorless, odorless and tasteless and can only be measured using special equipment. Because it is a gas, radon can move freely through the soil enabling it to enter the atmosphere. When radon surfaces in the open air, it is quickly diluted to harmless concentrations, but when it enters an enclosed space, such as a house, it can sometimes accumulate to unacceptably high concentrations. So, measurements of indoor radon are very important for escaping from radon risks. Until now, to measure the indoor radon concentration, imported radon sensors are needed. So, DB construction of indoor radon emission and popular radon measuring apparatus should be developed. In this paper, we propose the radon detecting method using PIN photodiode and CMOS image sensors. Also, we confirmed the PIN photodiode and CMOS image sensors could be used as radon sensor module through some experimental studies.

태양광 발전효율 증대를 위한 최대전력추종 시스템에서 Anti-windup 적용의 효과 분석 Application Effectiveness Analysis of Anti-windup Method in MPPT System for Improving Photovoltaic Efficiency

박시효(Si-Hyo Park) ; 최종용(Jong-Yong Choi) ; 손진근(Jin-Geun Shon)

In this paper, application and comparative analysis of anti-windup method for improving the response of voltage control of MPPT method in photovoltaic generation system is proposed. In the case of MPPT, PI control can be mainly used to control a target voltage from a reference voltage that continuously changes according to changes in the surrounding environment for optimal control of PV power production. However, its PI controller has accumulated saturation of errors in the process of integrating the errors, so it is necessary to consider the integrator windup. This problem could affect the power production efficiency when performing MPPT control, so this paper sought to verify its effect by applying the follow-up anti-windup technique to MPPT control to improve the integral windup phenomenon. It could be confirmed from the results of the presented simulation that the application of the proposed algorithm mixed is more effective to improve the control performance of the photovoltaic system.

고조파 보상을 위한 하이브리드 능동전력필터(HAPF)에서 APF의 정현파 전압 주입에 따른 무효전력 상관 관계 분석 및 보상방안 Reactive Power Analysis and Compensation Method with the Injected Sinusoidal Waveform Voltage of APF in Harmonic Compensation HAPF

박경종(Kyoung-jong Park) ; 김재철(Jae-chul Kim) ; 이현재(Hyun-jae Lee) ; 손진근(Jin-geun Shon)

Active power filter (APF) is the preeminent solution against nonlinear loads, current harmonics, and power quality problems. Hybrid APF topologies combining low-power rating APF with LC-based passive power filters(PPF) are used to reduce the power rating of voltage source inverter. If the parameter of the PPF part of the HAPF for decreasing the THD is not properly designed to match the system, efficiency degradation due to control error and overcompensation of reactive power may occur, leading power factor. In order to properly design the capacity of the passive filter of the HAPF, this paper proposes a capacity selection method that considers harmonics and reactive power at the same time. Also, in this paper, reactive power analysis and compensation method in HAPF is presented, operating with the injected sinusoidal waveform voltage of APF. The compensated reactive power performance when considering the variable injection voltage as the proposed method was compared through simulation. As a result, THD was minimized and the controlled reactive power could be reached.

고속 모터의 토크 리플 및 효율 개선을 위한 고정자 구조에 대한 연구 A Study on the Stator Structure to Improve the Torque Ripple and Efficiency of High-speed Motors

김현준(Hyun-Joon Kim) ; 문주형(Dong-Woo Kang) ; 강동우(Ju-Hyeong Moon) ; 김태형(Tae-Hyeong Kim)

Recently, the demand for electric motors for high-speed operation is increasing due to the development of hydrogen vehicles using fuel cells as well as electric vehicles. In particular, the Air Blower Motor is receiving a lot of attention as an electric motor for hydrogen vehicles, and there is a need for performance improvement research on high-power, high-speed machines. In this paper, a coreless model with stator tooth removed was studied and designed to design a high-performance, high-speed motor. The purpose of this study was to increase the specific power of the motor by reducing the core usage and improve the efficiency by reducing the loss by improving the iron loss. It was verified that the torque ripple and loss of the coreless model were improved through the Finite Elements Method (FEM).

철도 차량 차체 특성을 고려한 견인 전동기의 용량 산정 기법 연구 A study on the Method of Calculating the Capacity of Traction Motor Considering the Characteristics of the Railway Vehicle

이현재(Hyun-jae Lee) ; 이수길(Su-gil Lee) ; 김길동(Gil-dong Kim) ; 손진근(Jin-geun Shon)

This paper studies a method for calculating the capacity of a propulsion motor for a railway vehicle using the design characteristics of the vehicle body specification. In the case of railroad vehicles, an appropriate propulsion motor capable of generating the traction required by the locomotive must be designed, and it is necessary to design the motor in consideration of various design characteristics. Accordingly, in this paper, a method for calculating the output of an electric motor considering the speed and traction force of a railway vehicle is studied. At this time, the research process was formulated using the design characteristics and physical characteristics of the railway vehicle, and its validity was verified using the traction output table of the No. 7600 unit. As a result, an average error of about 1.5 [%] occurred between the measured motor output and the calculated motor output.

위상시프트 제어법을 적용한 공진형 스위치드 커패시터 DC-DC 컨버터의 특성 Characteristics of a Resonant Switched Capacitor DC-DC Converter based on Phase Shift Control Method

유우창(Woo-Chang Yoo) ; 유의정(Yeoi-Joung Ryu) ; 문상필(Sang-Pil Mun) ; 우경일(Kyung-Il Woo)

This paper deals with a transient characteristics improvement of a resonant switched capacitor converter(RSCC)based on phase shift control method, which has capability of accurate voltage regulation by means of applying a voltage feedback control. The analysis in this paper reveals that the RSCC may superpose an unwanted current on the resonant current and cause voltage fluctuation and/or over current in a transient state. This paper proposes a modified phase shift control method including the sequence and timing control of the gate signals, resulting in elimination of the unwanted current from the resonant current. Experimental results verify the validity of the proposed control method.

퍼블릭 클라우드 기반 셀프 밸런싱 로봇 네트워크 제어 시스템 Networked Control System for Self-Balancing Robot based on Public Cloud

구세완(Sewan Gu) ; 윤동원(Dongweon Yoon)

In a networked control system, a controlled model and a controller are remotely operated via network communication. In this paper, we propose a public cloud-based real-time networked control system and demonstrate the feasibility of its real-time control performance by building a self-balancing robot and conducting experiments with it. We first build the self-balancing robot as the controlled model and implement the controller into a docker container for the networked control system. In addition, we utilize the google cloud platform as the computing and networking resources to establish Kubernetes platform, which operates the control system. Through the experiments, we show the self-balancing robot is controlled and maintains its balance in the cloud-based networked control system.

사용자 안전성을 고려한 상지 재활치료 로봇의 병렬 안전 제어 시스템 Parallel Safety Control System for Upper-Limb Rehabilitation Robot Considering User Safety

백승환(Seunghwan Baek) ; 박성원(Sung-Won Park)

This study proposes a parallel safety control system for upper-limb rehabilitation robots to ensure patient safety. The mechanical and electrical safety devices to ensure patient safety are designed and developed to operate in several stages. The mechanical safety device is configured in a way to set the limit, and the electrical safety is constructed considering electrical insulation and failure. The safety switch could directly and immediately stop the robot's motion, and it is also implemented by the software safety switch for hazardous situations. The electrical safety system, the safety switching system, and the monitoring system are designed in a multiplexed structure that operates organically at any time in case of danger at various stages to ensure reliability against failures and malfunctions

게임 메모리 변조 공격 방지를 위한 블록체인 기반 게임 해킹 탐지 시스템 개발 Development of Blockchain-Based Game Hacking Detection System to Prevent Memory Modulation Attacks

이동욱(DongWook Lee) ; 김진하(JinHa Kim) ; 이지유(JiYoo Lee) ; 서창진(ChangJin Seo)

The game hack program continues to develop as the online games market expands recently. The current method of game makers to respond to the game hack program is not good in responding to the fact that the behavior of the game users cannot be analyzed individually and the game hack continues to change. In this paper, we propose a system corresponding to the hack program of the memory modulation method, which is the most used among the game hack methods. The proposed system detects hacks by blockchainizing and verifying the main data of the game where memory tampering occurs. Because it is based on the blockchain, it is not easy to hack and manipulate data, so the security and integrity of the system can be effectively guaranteed. In addition, unlike the existing centralized system that verifies on the server, it is a distributed system that users directly verify. Therefore, it is possible to prevent the overload of the server.

딥러닝 기반의 2차원 이미지 왜곡 분류 및 이미지 각도 보정 시스템 개발 Development of 2D Image Distortion Classification and Image Angle Calibration System Based on Deep Learning

김선화(SeonHwa Kim) ; 김유진(YuJin Kim) ; 최수민(SuMin Choi) ; 서창진(ChangJin Seo)

When taking a picture with a camera, the distortion that is different from reality occurs due to wide-angle lenses and camera angles. In this paper, we propose an image distortion classification and calibration program that provides users with standard images before distortion by classification and calibrating distortion. The program automatically predicts camera parameters from a single input image and proceeds with calibration. Inputting the image, distortion image classification using deep learning (CNN) determines whether Wide-angle lens distortion and Camera-angle distortion exist. When it is determined that distortion exists, deep learning and OpenCV are used to calibrate the distortion state according to each image characteristic. As a result of the program operation, it was confirmed that the output image was calibrated similarly to the actual one, and more fine distortion calibration can be expected by finding distortions that were difficult to judge only with human eyes.

다항회귀모델의 잔차 정보를 이용한 교류 직렬 아크검출 알고리즘 개발 Development of AC arc Detection Algorithm using Residual Information of Poly-nominal Regression Model

지평식(Pyeong-Shik Ji)

In this paper, an AC series arc detection algorithm using residual information of a polynomial regression model was developed. The developed algorithm calculates the multiple regression model equation using the given data, and then determines whether there is an arc based on the residual information between the given data and the estimated values calculated by the multiple regression model. The calculation speed was improved by resampling the acquired data to calculate the multiple regression model equation. In order to verify the validity of the proposed method, the mean square error criterion for data with an absolute residual of 0.14 or more was set to 0.1, and as a result of the experiment, the arc and normal data detection performance was 100%, thus verifying the validity of the proposed method.