전력선 통신을 이용한 모터제어시스템 개발

박영만(Young-Man Park) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4

Power line communication transmitting electric energy and data for communication to a power line at the same time is being gradually used much in the industrial automation field and shows a property coinciding well with fusion technology that is big flow of recent IT technology. Power lines are being more widely laid than communication lines in the industrial field, so if power line communication is used, there is an advantage that can economically and efficiently utilize in various power equipment s wire communications without laying separate communication lines. The present thesis manufactured motor control and communication interface circuits consisted of REM(Remote) Board capable of remotely monitoring operating conditions of motors at a central control panel, LCP(Local Control Panel) Board controlling motors in the field and MCC(Motor Control Center) Board controlling motors actually by selecting a NC-PLCD model of NEOTICS Company among power line communication modules and realized a motor control system using power line communication by designing communication protocol. If the present system is applied, it can be applied to a communications network for power control, control of various power devices and various automation systems, etc.

An Indoor Broadcasting System Using Light-Emitting Diode Lamps Coupled with Power Line

( Seong Ho Lee ) 한국센서학회 2015 센서학회지 Vol.24 No.5

We introduce an indoor broadcasting system using light-emitting diode (LED) lamps coupled with a 220 V power line. Two couplers connected to the power line constitute a power line communication (PLC) link. The transmission path from an LED lamp to a photodetector forms a visible light communication (VLC) link in free space. When the LED lamp is coupled to the power line, a composite PLC-VLC link is formed, making it possible to transmit a VLC signal beyond line-of-sight. In experiments, a 4 kHz analog signal modulated with a 100 kHz carrier was sent to the power line by a PLC coupler, and LED lamps coupled to the power line detected the signal and radiated it to multiple VLC receivers in the room. This configuration is useful in expanding an indoor VLC sensor network to adjacent rooms or constructing a voice broadcasting system in a building or apartments with existing power lines.

전력선 통신을 위한 적응형 라인 커플러에 관한 연구

최원호,박종연 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-

This paper presents an adaptive line coupler to match input impedance of the Power line Communication (PLC) modem between access impedance of the power line. This line coupler provides maximum signal power transmiting capability, high reliability. The structure of this coupler is simple and designed to make a easy and low cost. The proposed line coupler is suitable for Amplitude Shift Keying (ASK) or Phase Shift Keying (PSK) modem. To figure out our models, the analysis of the transmitting features of power line channel is performed in the time domain at the carrier frequency. As a result of this study, we present the values of capacitors in the capacitor bank and adaptive line coupler circuit.

원격 검침용 PLC 기술(KS X 4600-1 / ISO IEC 12139-1) 보안성 분석

홍정대(Jeongdae Hong),천정희(Jung Hee Cheon),주성호(Seong-ho Ju),최문석(Moon-suk Choi) 한국정보보호학회 2011 정보보호학회논문지 Vol.21 No.1

전력선통신(Power Line Communication: PLC)은 기존의 전력선에 고주파 신호를 중첩하는 방법으로 데이터를 전송하는 통신기술이다. 전력선통신은 연결의 편리성과 확장성 때문에 통신선로 보급이 낮은 지역의 대체 통신수단 뿐 아니라 옥내 가전기기(Home appliances)간의 통신 등으로도 주목받고 있으며, 최근 한국 전력에서도 전력선 통신 기술을 이용하여 검침값을 전송하는 원격검침시스템을 구축하고 있다. 대부분의 전력선 통신 기술은 하위 계층의 보안 프로토콜을 이용하여 안전성을 확보하고 있는데, 이는 전력선 통신의 물리적인 특성과 여러 가지 난수요소로 인해 실질적인 검침값 획득 및 변조 등의 공격이 어려울 것이라는 예측에 기반을 두고 있다. 이 논문에서는 전력선 통신의 정확한 보안성을 평가하기 위해, 먼저 하위 계층 보안 프로토콜을 포함한 전력선 통신의 동작 방식을 분석한다. 이를 통하여 검침값 데이터가 현재 상태로 전송될 경우 전력선 통신의 여러 가지 임의성에도 불구하고 검침값 변조와 같은 실질적인 공격이 가능함을 보인다. 또한 이를 보완하기 위해 다른 통신 프로토콜과 마찬가지로 상위 계층에서 보안 프로토콜이 필요함을 지적한다. 이 논문에서 제시한 전력선 통신의 동작방식 분석은 본 논문의 결론과 더불어 향후 스마트 그리드 등 대규모 사업에 사용될 전력선 통신의 표준 보안 기술 설계에 유용하게 활용될 수 있을 것으로 기대된다. Power Line Communication (PLC) is a system for carrying data on a conductor used for electric power transmission. Recently, PLC has received much attention due to connection efficiency and possibility of extension. It can be used for not only alternative communication, in which communication line is not sufficient, but also for communication between home appliances. Korea Electronic Power Cooperation (KEPCO) is constructing the system, which automatically collects values of power consumption of every household. Due to the randomness and complicated physical characteristics of PLC protocol (KS X4600-1), it has been believed that the current PLC is secure in the sense that it is hard that an attacker guesses or modifies the value of power consumption. However, we show that the randomness of the protocol is closely related to state of the communication line and thus anyone can easily guess the randomness by checking the state of the communication line. In order to analyze the security of PLC, we study the protocol in detail and show some vulnerability. In addition, we suggest that PLC need more secure protocol on higher layers. We expect that the study of PLC help in designing more secure protocol as well.

Relay Selection in Cooperative Power Line Communication: A Multi-Armed Bandit Approach

Babak Nikfar,A. J. Han Vinck 한국통신학회 2017 Journal of communications and networks Vol.19 No.1

Power line communication (PLC) exploits the existence ofinstalled infrastructure of power delivery system, in order to trans-mit data over power lines. In PLC networks, different nodes of thenetwork are interconnected via power delivery transmission lines,and the data signal is flowing between them. However, the attenu-ation and the harsh environment of the power line communicationchannels, makes it difficult to establish a reliable communicationbetween two nodes of the network which are separated by a longdistance. Relaying and cooperative communication has been usedto overcome this problem. In this paper a two-hop cooperative PLChas been studied, where the data is communicated between a trans-mitter and a receiver node, through a single array node which hasto be selected from a set of available arrays. The relay selectionproblemcan be solved by having channel state information (CSI) attransmitter and selecting the relay which results in the best perfor-mance. However, acquiring the channel state information at trans-mitter increases the complexity of the communication system andintroduces undesired overhead to the system. We propose a classof machine learning schemes, namely multi-armed bandit (MAB),to solve the relay selection problem without the knowledge of thechannel at the transmitter. Furthermore, we develop a new MABalgorithm which exploits the periodicity of the synchronous impul-sive noise of the PLC channel, in order to improve the relay selec-tion algorithm.

전력선통신을 위한 고압 배전선로의 방사전계강도 계산

천동완,박영진,김관호,신철재,Chun Dong-wan,Park Young-jin,Kim Kwan-ho,Shin Chull-chai 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.12A

In this paper, the radiative electric field intensity due to the communication signal and conductive noise is calculated in overhead medium voltage power lines for power line communication. The input impedance is calculated by means of 2 port equivalent model of medium voltage power line network and basic transmission line theory. And then, currents is calculated by calculated input impedance and finally, the emissive electric field is calculated. The input impedance appears like a standing wave form with a fixed cycle because high reflection at the input terminal due to the characteristic impedance of medium voltage power line is very large. A calculated current and radiative electric field also appears like this form. From the measurement results, the measured results are very similar to the calculated results. 본 논문에서는 전력선 통신을 위해 사용되는 고압 배전선로에서 통신신호 및 잡음신호에 의해 방사되는 방사전계강도를 계산하였다. 전력선 통신 네트워크의 2포트 등가모델 및 기본적인 전송선로 이론을 이용해 입력임피던스를 계산하였다. 그리고 계산된 입력임피던스를 이용해 전력선상 전류를 계산하고 최종적으로 방사전계강도를 계산하였다. 전력선의 특성임피던스가 매우커서 입력 단에서의 반사가 심하기 때문에 입력임피던스는 일정한 주기를 가지는 정재파 형태를 가진다. 계산된 전류 및 방사전계 또한 이러한 형태임을 알 수 있었다. 실제 측정한 결과계산 치와 측정치가 매우 유사함을 알 수 있었다.

전력선 통신 기술을 이용한 조명제어 스위치의 개발

길경석,송재용,문승보,이경수,김창율 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.5

Lighting control switches based on the power line communication technology are developed and extended to incorporate dimming control to provide energy saving and appropriate illumination. The developed switch uses a general purpose microprocessor and associated electronics. Both the power line communication and the dimming function are implemented in one microprocessor, and it enables the low price commercialization.The frequency of the carrier was set at 250kHz considering the transmission data length and signal attenuation in power lines.Tests on prototypes in an low-voltage power lines have shown that the switches have a robust operation characteristics with the length of power lines and the variation of load capacities. 본 논문에서는 전력선 통신과 조광 기술을 기반으로 에너지 절약과 적정 조도의 제어가 가능한 조명제어 스위치의 개발에 대하여 기술하였다. 개발된 스위치는 범용의 마이크로프로세서와 주변 전자기술을 이용하며, 하나의 마이크로프로세서로 전력선 통신과 조광기능을 구현함으로서 저가격 상용화가 가능하였다. 캐리어 주파수는 전송 데이터 길이와 신호감쇄를 고려하여 250kHz로 설정하였다. 저압선로에서 시제작품에 대한 시험결과, 본 스위치는 전력선의 길이와 부하용량의 변동에 대해 강인하게 동작하는 것을 확인하였다.

송전선용 비접촉식 커플러의 설계와 적용연구

김현식,이동철,김민호,이진,오영우,민병훈,Kim, Hyun-Sik,Lee, Dong-Chul,Kim, Min-Ho,Lee, Gean,Oh, Young-Woo,Min, Byung-Hoon 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.3

An inductive coupler, which feeds communication to the electric power transmission line, is required to establish Power Line Communication(PLC). The electro-magnetic property of magnetic core and design technology for coupler are very important to manufacture an inductive coupler for power transmission line. The magnetic core with superior electro-magnetic property was manufactured by using nanocrystalline alloy and an inductive coupler, which can operate at the maximum 2,000 A current, was designed and manufactured by establishment of current saturation, signal out winding, and electromagnetic simulation in this study. Communication speed of 14 Mbps in 600 meter communication distance of the real electric power transmission line was obtained by using the inductive coupler and application possibility of the inductive coupler for the electric power transmission line was certified.

전력선 통신기술을 이용한 조명제어 스위치의 개발

길경석,송재용,문승보,이경수,김창율,Song Jae-yong,Moon Seung-bo,kil Gyung-suk,Lee Gyung-soo,Kim Chang-yul 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.4

본 논문에서는 전력선 통신과 조광 기술을 기반으로 에너지 절약과 적정 조도의 제어가 가능한 조명제어 스위치의 개발에 대하여 기술하였다. 개발된 스위치는 범용의 마이크로프로세서와 주변 전자기술을 이용하며, 하나의 마이크로프로세서로 전력선 통신과 조광기능을 구현함으로서 저가격 상용화가 가능하였다. 캐리어 주파수는 전송 데이터 길이와 신호감쇄를 고려하여 250kHz로 설정하였다. 저압선로에서 시제작품에 대한 시험결과, 본 스위치는 전력선의 길이와 부하용량의 변동에 대해 강인하게 동작하는 것을 확인하였다. Lighting control switches based on the power line communication technology are developed and extended to incorporate dimming control to provide energy saving and appropriate illumination. The developed switch uses a general purpose microprocessor and associated electronics. Both the power line communication and the dimming function are implemented in one microprocessor, and it enables the low price commercialization. The frequency of the carrier was set at 250kHz considering the transmission data length and signal attenuation in power lines. Tests on prototypes in an low-voltage power lines have shown that the switches have a robust operation characteristics with the length of power lines and the variation of load capacities.

지중 전력선 통신채널의 특성 해석

엄기환(Ki-Hwan Eom),신재호(Jai-Ho Shin),이승준(Seung-Joon Lee) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.5

본 논문에서는 광대역 지중 전력선 통신 모뎀 및 네트워크 기술개발을 위하여 실제측정을 통해 지중 전력선 통신채널의 특성을 해석하였다. 지중 배전선로의 길이 및 구조물에 따른 지중 배전선로의 광대역 전력선 통신채널의 감쇠 량을 측정하기 위해 신호발생기, 스펙트럼 분석기, 비접촉식 커플러 등을 이용하여 채널 측정 시스템을 구성하였다. 실증시험을 위해 시험선로 내 단일 선로로서 가장 긴 고압 선로 두 곳을 선택하고, 그 채널상의 노이즈 특성 및 신호감쇠 레벨을 측정하였다. 측정결과 통신성능을 매우 떨어뜨릴 수 있는 임펄스 노이즈가 존재하는 것을 확인하였으며, 장거리 선로의 경우 선로 길이에 의한 고주파 감쇠가 나타나는 것으로 확인하였다. In this paper, to develop a broadband power line communication modem and network technologies, we analysis the characteristics of underground power line communication channel through actual tests. To measure the amount of attenuation by length and structure of broadband power line communication channel, we configure a measurement system of the channel with signal generator, spectrum analyzer and non-contacted coupler. For actual tests, we choose two of the longest lines among medium-voltage lines as a single line in the test lines and measure the characteristics of noise and signal attenuation level of the channel. The experimental results show that the channel has a impulse noise which can remarkably reduce communication capability. In the case of long lines, high-frequency attenuation appeared by length of the lines.