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소형 굴삭기의 원격제어를 위한 주행 알고리즘 및 통신특성에 관한 연구
정진범(Jin Beom Jeong),김경수(Kyung Soo Kim) 유공압건설기계학회 2018 드라이브·컨트롤 Vol.15 No.4
Indoor construction site such as building demolition sites, tunnel, vinyl house, and cattle shed are subject to various risk factors such as falling stones, soot and bad odors. However, most of the mini excavators have no cabin that can protect the driver from such risk factors. Therefore, researches on remote control technology of construction equipment are actively conducted as a method for protecting the driver from the risk factors occurring in the working environment. For effective remote control, it is necessary to be able to control the travelling and work using a portable small transmitter. However, due to the limitation of the size of the transmitter, complex operation control is required to control two or more actuators with a single joystick. Also, it is essential to check how remote control characteristics change in various environments such as distance, signal strength, obstacle. Therefore, in this study, an algorithm that can control two actuators simultaneously with a single joystick signal was developed, and a communication method suitable for indoor and outdoor mini construction equipment by analyzing experimentally how the remote control characteristics vary according to various work environments and telecommunication methods proposed.
계통 연계형 태양광 발전 시스템의 부하 모효전력 보상이 적용된 단독운전 인지법
鄭鎭範(Jin-Beom Jeong),申東賢(Dong-Hyun Shin),金熙峻(Hee-Jun Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
In this paper, we present an active anti-islanding method with a load monitoring system using reactive power control. The proposed method, which is based on reactive power control, has fewer harmonics components than those in conventional methods, and it can minimize the reactive power component of the grid because it compensates the reactive power component with the load monitoring. The proposed quick islanding detection method was confirmed from the experimental results with an inverter for a 3㎾ photovoltaic system.