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
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    Korea Citation Index(KCI)

열차자율주행제어 성능분석을 위한 SITL기반 시뮬레이터의 설계 Design of SITL-based Simulator for Performance Analysis of Autonomous Train Control

https://doi.org/10.5370/KIEEP.2022.71.4.203

황종규(Jong-Gyu Hwang) ; 채성윤(Sung-Yoon Chae) ; 최현영(Hyeon Yeong Choi) ; 정락교(Rag-Gyo Jeong)

Train control technology is being developed from ground-centered control to vehicle-centered control technology and new train control technology by direct communication between trains is being researched at home and abroad according to the recent development of communication technology. In the development of these new train control technology it is necessary to analyze performance on new technology through simulated driving on same virtual railway tracks or routes and comparative performance between the existing train control and new developed technology. This requires software-based virtual tracks for various comparative performance analysis of train control technology through the application of existing signaling systems as well as new technology like autonomous train driving technology. For these reason SITL-based train control simulator structure was proposed and a prototype of virtual operating track editor among of proposed simulator was developed. The proposed simulator in this paper is expected to be very useful in the development of new train control technology like autonomous driving control.

온도 및 조사강도 통합보정을 통한 태양광모듈의 전력측정법에 대한 연구 A study on the PV module power measurement method through integrated correction of temperature and irradiance

https://doi.org/10.5370/KIEEP.2022.71.4.210

신정현(Jeong-Hyun Shin) ; 이영석(Young-Seok Lee) ; 이승재(eung-Jae Lee) ; 문종필(Jong-Fil Moon)

Power measurement for photovoltaic(PV) modules is a key factor in evaluating the performance, safety, and long-term reliability of photovoltaic modules. The power measurement for the PV module is made by measuring the electrical characteristics by a solar simulator, which is an artificial solar light source. These solar simulators are divided into two types, which are the pulse-type simulator and the continuous type simulator. In the pulse simulator, the temperature characteristics are stabilized and there is not temperature difference between the inside and outside of the solar module to be measured. The continuous irradiation simulator has fluctuations in temperature characteristics due to continuous light irradiation, and there is a temperature difference between the inside and outside of the PV module to be measured. The variability of these temperature characteristics can be improved through temperature correction. In addition, the convenience of measurement can be improved by predicting the power and correcting the irradiance to the temperature correction. The integrated correction of temperature and irradiance proposed in this paper can be contributed to the power measurement of PV modules in the continuous type simulator.

Near-Field Coupling을 접목한 배터리 셀 밸런싱을 위한 송·수신기 코일 모델링 Transmitter and receiver coil modeling for a novel cell balancing with using near-field coupling

https://doi.org/10.5370/KIEEP.2022.71.4.216

전주현(Juhyeon Jeon) ; 박월국(Wulguk Park) ; 류신호(Sin-Ho Ryu) ; 이동호(Dongho Lee)

This paper proposes a novel cell balancing method with using near-field coupling, which produces higher efficiency than passive type and faster than active type, which is the conventional battery cell balancing approach. As the importance of cell balancing has increased due to the increase in the proportion of renewable energy generation and the recycling of waste batteries, this approach is designed to meet the demand for high-capacity and high-power system. This paper focus on transmitter and receiver coil simulation models required to implement the proposed approach. it is confirmed that the schematic simulation model was sufficiently applicable. the measurement and 3D EM model are similar to the schematic model with only one inductor at the frequency we use. The measurement result of 2 times faster cell balancing with the coil designed with the proposed schematic model is presented

커뮤니티 기반 프로슈머 ESS 공유 모델 ESS Sharing Model for Community-based Prosumers

https://doi.org/10.5370/KIEEP.2022.71.4.222

김재형(Jae-Hyeong Kim) ; 박성원(Sung-Won Park) ; 손성용(Sung-Yong Son)

Demand for ESS is increasing as time goes on due to its various uses. Although the ESS cost is decreasing, there are problems of high initial cost and the need for installation space for general customers. The concept of a shared ESS, where multiple customers use a single ESS, is emerging. This study proposes the ESS capacity sharing model among prosumers with real ESS and customers without ESS. The proposed shared model showed that the prosumers' ESS could be used as a shared ESS without installing a new ESS while increasing the profit of the prosumer and customers through case studies.

정현파 주입 방안 적용에 따른 HAPF용 패시브 필터 설계 방안의 역률 보상 정확성 개선 Improvement of Power Factor Compensation Accuracy of Passive Filter Design Method for HAPF by Application of Sine Wave Injection Method

https://doi.org/10.5370/KIEEP.2022.71.4.233

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

This paper proposes a method to compensate for the power factor error existing in the passive filter design method for HAPF by applying the sinusoidal wave injection method to the LC design method of the passive filter for HAPF. As the LC design method of the passive filter for HAPF assumes that is 1[p.u], it is necessary to completely compensate the harmonics included in the system to accurately compensate the power factor. This is a result of assuming an ideal case, and in practical terms, harmonics cannot be completely eliminated. Therefore, since is not 1[p.u], an error may occur in reactive power compensation. Accordingly, in this paper, we propose a method to reduce the power factor error by applying the sinusoidal injection method based on the default value used in the LC design method of the passive filter for HAPF for MI. The power factor error that appears when the sinusoidal wave injection method is applied to the LC design method of the passive filter for HAPF was precisely compared and analyzed, and the error and effect were analyzed through simulation. As a result, it was possible to see the result of reducing the error from 0.296 [%], which is the power factor error of the passive design method for HAPF, to about 0.04 [%] by applying the sinusoidal injection method.

태양광 시스템의 신뢰성 중심 적응형 유지보수 계획 Adaptive Reliability Centered Maintenance Scheduling for Photovoltaic System

https://doi.org/10.5370/KIEEP.2022.71.4.239

남태양(Tae-Yang Nam) ; 김병기(Byung-Ki Kim) ; 문원식(Won-Sik Moon) ; 김재철(Jae-Chul Kim) ; 한성호(Seong-Ho Han)

Recently, as the supply of photovoltaic systems has increased, photovoltaic facilities with long operation days are increasing. As the number of operating days of a photovoltaic facility increases, the failure rate increases. Failures of these facilities affect the reliability of the connected power system. In addition, photovoltaic generation operators suffer cost losses when supply is disrupted. Therefore, a proper maintenance plan for photovoltaic facilities is required. This paper established an adaptive maintenance plan for photovoltaic systems focusing on reliability. Reliability was analyzed through the life evaluation of each piece of equipment in the photovoltaic system, and the system reliability index was calculated.

권선법에 따른 매입형 영구자석 전동기의 운전특성 분석 및 와전류 손실 저감에 관한 연구 A Study On the Operational Characteristics and Eddy Current Loss Reduction of IPMSM According to Winding Method

https://doi.org/10.5370/KIEEP.2022.71.4.248

양인준(In-Jun Yang) ; 최도현(Do-Hyeon Choi) ; 김원호(Won-Ho Kim) ; 정동훈(Dong-Hoon Jung)

Concentrated IPMSM has advantages in various aspects, such as space ratio, mass productivity, and copper loss, but concentrated winding has a limitation that the eddy current loss of permanent magnets is quite large compared to distributed winding. Eddy current loss means the heat of the rotor and becomes larger during high-speed operation. Therefore, in the concentrated IPMSM that requires high-speed operation, it is essential to design to reduce eddy current loss. In this paper, in order to reduce the eddy current loss of the IPMSM, a shape that increases the reluctance of the q-axis was applied to the rotor, and each was designed by dividing into concentrated winding and distributed winding. The number of pole slots of concentrated winding was selected as 6 poles and 9 slots, and the number of pole slots of distributed winding was selected as 6 poles and 27 slots. Through FEA, the voltammetry limit circle and T-N curve were compared according to each winding method. By comparing the d-axis inductance and q-axis inductance, a model that is advantageous at high speed was confirmed, and the no-load and load characteristics according to the operating speed were compared in detail

반도체 CVD 공정용 모터의 고속화 및 토크리플 저감을 위한 설계 Design of High Speed and Torque Ripple Reduction of Motors for Semiconductor CVD Process

https://doi.org/10.5370/KIEEP.2022.71.4.255

최도현(Do-Hyeon Choi) ; 양인준(In-Jun Yang) ; 김원호(Won-Ho Kim) ; 정동훈(Dong-Hoon Jung)

This paper proposes a design method for reducing torque ripple and high speed IPMSM used in motors for semiconductor CVD process. IPMSM can utilize the reluctance torque through the difference in inductance between the d-axis and the q-axis, but has a disadvantage in terms of torque ripple. Accordingly, an improved model was designed to reduce torque ripple and simultaneously reduce eddy current loss by applying taper ring to the rotor. The voltage and current limiting sources and speed-torque curves were compared with the existing model, and the no-load and load performance were compared by operating speed. In addition, the web thickness of the improved model was secured through demagnetization analysis and mechanical stiffness analysis of permanent magnets, and the design feasibility of the improved model and the existing model was verified through the FEA analysis results.

에너지 전환에 따른 전기철도의 태양광발전 적용 방안에 관한 연구 Application of Photovoltaic Systems for Electric Railway in the Energy Transition

https://doi.org/10.5370/KIEEP.2022.71.4.262

문원식(Won-Sik Moon) ; 남태양(Tae-Yang Nam) ; 윤광훈(Kwang-Hoon Yoon) ; 이지원(Ji-Won Lee) ; 박성준(Seong-Jun Park) ; 한성호(Seong-Ho Han)

The increasing interest of the Nationally determined contributions (NDC) to reduce national emissions has given rise to the need for turning our attention to new renewable energy sources, especially photovoltaic (PV) generation. To evaluate the impact of interconnecting PV and railway systems in Korea Railroad (Korail), this study analyzes the power system configurations and the load characteristics of railway system in Korail. In addition, the impact of System Marginal Price (SMP) variations and renewable energy policies on the introduction of renewable energy in electric railways was analyzed. Also, the PV power generation types applicable to electric railways is presented. Through a case study applied to Korail Line 1 station between Guro and Suwon, economic benefits from the introduction of vertical photovoltaic power generation are analyzed.

실차 운행 조건에서 전기자동차 배터리 소모 전류 측정 방법 및 전비 비교 Comparison of Battery Current Measurement Methods and Fuel Economy of the Electric Vehicle at the Real Driving Conditions

https://doi.org/10.5370/KIEEP.2022.71.4.269

이상현(Sang-Hyun Lee) ; 한만배(Manbae Han)

As the number of electric vehicles is increasing, various studies such as driving motors, batteries, and charging systems have been conducted. To perform these studies, battery pack current measurement is a prerequisite. In general, battery pack current can be measured by installing an ammeter. If we access to OBD via CAN communication, the current offered by the BMS can be read. The first method is cumbersome and risky to install the ammeter and measure current due to the usage of the high-voltage cable. For the second method, the current data is output from the BMS and thus easy to acquire it if available to access CAN DB. In this study the current consumption was compared based on these two current measurement methods. To compare the current consumption, an electric vehicle was run on the chassis dynamometer at three driving modes such as ASM2525, UDDS and US06 reflecting various driving conditions. Furthermore, the fuel economy was calculated with such test modes. The difference of current consumption between two measurement methods was comparable and the fuel economy was the highest in the order of ASM2525, UDDS and US06.

필터 리액턴스 오차에 의한 병렬연계 인버터 기반 슬랙발전기의 최대 용량 분석 Maximum Capacity Analysis of Parallel-Connected Inverter-Based Slack Generator by Filter Reactance Error

https://doi.org/10.5370/KIEEP.2022.71.4.275

이수형(Soo Hyoung Lee)

The renewable-energy-penetration is rapidly increasing worldwide. This causes an increase in the inverter ratio in the power system. This paper analyzes the effect of filter reactance error on the capacity of a scaled-up slack generator. In the scaled-up slack generator, parallel-connected multiple inverters, except the physical slack inverter, share the power supply to the grid by a predetermined ratio based on their capacities. It is inevitable having an error between real and known values of filter reactance. This makes the multiple inverters operate non-identically, so it reduces the maximum potential capacity of the scaled-up slack generator. The scaled-up slack generator is simulated with parallel-connected eleven inverters, including one physical slack, to get the data for the analysis. The simulation is conducted using a power system computer-aided design/electromagnetic transient including DC (PSCAD/EMTDCTM).

Turbo Expander Generator(TEG)를 이용한 자체기동 발전기 대체 관한 연구 A Study on the Replacement of Self-starting Generators using Turbo Expander Generator

https://doi.org/10.5370/KIEEP.2022.71.4.281

이종훈(Jonghoon Lee) ; 김성렬(Sungryeol Kim) ; 손다빈(Dabin Son) ; 한상욱(Sangwook Han)

In supplying natural gas to the city, Korea Gas Corporation manufactures a TEG generator using the energy that lowers the gas pressure, and conducts research to demonstrate the application. Since TEG is a facility that generates electricity using only natural gas pressure, it is characterized by being able to generate electricity without any other special energy source. This is similar to a hydroelectric generator and can be used as a self-starting generator that is first started to recover when a power outage occurs throughout the power system. In this paper, since the location where TEG generators are currently being demonstrated corresponds to southern Gyeongin in terms of the procedure for restoring the system in the event of a power outage, we propose a plan to replace self-starting generators in southern Gyeongin with TEGs and restore the power system. Replacing the self-starting generator with TEG, confirming through simulation whether the priority starting generator can operate through the transmission line, and reflecting the characteristics of the TEG generator consisting of an induction generator, the amount of reactive power required to pressurize the transmission line and the power required to supply the priority start generator was analyzed. It was confirmed that the TEG generator can produce the same output as the self-starting generator by using the charging current charged from the trial transmission line and the additional parallel capacitor. In the future, TEG will be used not only as a self-starting generator, but also as a generator that can provide inertia to contribute to the stabilization of the power system.