• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.26-33
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• 2016

Recently, the use of transformer-less UPS has increased to improve the efficiency of UPS. However, transformer-less UPS is required in three-phase four-wire input IGBT PWM rectifier and the existing three-phase three-wire PFC algorithm cannot be applied in the three-phase four-wire system due to the neutral current problem of UPS input. To control the three-phase four-wire input IGBT PWM rectifier, there are two existing algorithms: 3D SVM and single phase control method. These two algorithms have advantages/disadvantages in controlling the rectifier. The single phase control method is unstable for controlling the rectifier and the 3D SVM method has a problem that must increase the L value of the input-side inductor considerably. Therefore, this paper proposes digital single phase control technology and another new algorithm considering the d-q control, to improve the characteristics of the existing control algorithm. In addition, this paper performed a simulation and experiment based on the proposed control algorithm. The simulation results showed that the proposed technology can control three-phase four-wire IGBT PWM rectifier in a stable manner and can also reduce the neutral current. The proposed algorithm is a useful tool for controlling the three-phase four-wire IGBT PWM rectifier.

• Journal of Advanced Navigation Technology
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• v.18 no.5
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• pp.508-512
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• 2014

This paper suggests the control system and algorithm for auto and manual control of the streetlight using RF system. There are two control system in this auto control algorithm. One is group control, the other individual control. In case of group control, if a car is detected by the object detecting sensor of the system installed on the streetlight, it will turn on the light per group by transmitting the RF signal. The streetlight turns on separately when it detects people or a car parked on the shoulder in accordance with the individual control. Also, there is manual control algorithm that manager can check surrounding environment and condition of the streetlight by RF signal and various sensors. So, not only the proposed system reduce meaningless energy consumption, but also it offers convenience regarding maintenance and control of the streetlight.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.413-414
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• 2011

최근 전기 자동차 배터리의 전하 균일 장치의 관심이 증가됨에 따라 제어가 간단하며 비교적 적은 소자를 통한 개별 전하 균일 장치 개발의 필요성이 대두되고 있다. 이 논문에서는 직렬 연결된 리튬 이온 배터리를 위한 개별 셀 전하 균일 장치를 제안한다. 이 장치는 하나의 공통된 인버터 동작을 공유하면서 개별로 나눠진 트렌스포머를 간단한 제어 동작을 통해 선택적으로 동작 시키는 방식을 사용한다. 이 구조를 통해 제안하는 전하 균일 장치는 전하 균일 전류를 제어함에 있어 간단한 구조와 제어 방법을 얻을 수 있다. 또한 대용량 배터리를 위한 큰 전하 균일 전류를 얻음에 있어 제안 회로는 신뢰성 있는 적은 수의 회로 소자 수를 가진다. 이 논문에서는 제안하는 장치의 회로와 동작 방법을 설명하면서, 8 개 리튬 이온 배터리를 위한 전하 균일 실험을 통해 제안 장치의 전하 균일 성능을 증명한다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.248-249
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• 2013

본 논문에서는 개별적인 MPPT 제어가 가능한 단상 DC-버스 분산형 인버터의 구조 및 제어 방식에 대해 소개한다. 본 인버터는 H-브릿지 인버터에서 직류단이 분리된 형태이며, 다수의 태양광 패널의 MPPT 제어가 가능하다. 본 논문에서는 제안된 인버터의 계통 발전 방식과 함께 각 태양광 패널의 전력 분배 제어에 대해 논의하며, 모의실험을 통해 제안된 방식의 성능을 확인한다.

• Journal of Korean Society of Transportation
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• v.27 no.5
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• pp.125-134
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• 2009

Recently, as IT technology and the ubiquitous environment have diffused, the application of these techniques are being attempted in the field of traffic operations and management. Therefore, it is necessary to develop data collection systems and signal control strategies that are suitable in the ubiquitous environment and that will improve efficiency and safety of signalized intersections. The authors conducted a study on the Wireless Sensor Network (WSN) signal control strategy using a wireless communication network between individual vehicles and a signal-control system and full actuated signal control technique to propose a new signal control strategy in the ubiquitous environment. The WSN was defined to evaluate the algorithm used with PARAMICS API simulation. The simulation produced results that the WSN signal control is more effective than other signal control methods. The WSN signal control could reduce vehicle delay time to a maximum of 64% in comparison with other signal control methods in low and near saturation flow conditions.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.148-150
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• 2020

모듈러 구조의 전력변환 장치는 고전류 및 고전력이 요구되는 어플리케이션에 사용한다. 일반적으로 모듈러 구조의 전력변환 장치는 전체 출력 전력을 각각의 단일 전력변환 장치의 출력 전력에 균등하게 분배되도록 제어하여 부하 부담을 모든 개별 전력변환 장치로 분산한다. 하지만 기존의 출력 전력 균등화 제어는 전력변환 장치 간의 전력변환 효율 차이에 대하여 능동적으로 대응할 수 없기 때문에 모듈러 구조의 전력변환 시스템의 전력변환 효율과 신뢰성을 저감할 수 있다. 본 논문에서는 개별 전력변환 장치 간의 실제적인 효율 차이를 고려하여 출력 전력이 아닌 입력 전력에 대하여 모듈러 구조로 구성된 개별 전력변환 장치의 부하를 조절하는 입력 전력 균등화 제어방법을 제안한다. 제안하는 입력 전력 균등화 제어 방법은 2개의 200 W급 모듈러 벅 컨버터를 통해 검증하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.3
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• pp.210-216
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• 2013

Rotor blades experience mechanical loads caused by the turbulent wind shear and an impulse-like wind due to the tower shadow effect. These mechanical loads shorten the life of wind turbine. As the size of wind turbine gets bigger, a control system design for mitigating mechanical loads becomes more important. In this paper, individual pitch control(IPC) for the mechanical loads reduction of rotor blades in a transition wind speed region is introduced, and simulation results verifying IPC performance are discussed.

• Journal of Aerospace System Engineering
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• v.18 no.1
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• pp.29-36
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• 2024

Recently, the concept of Urban Air Mobility (UAM) has expanded to Advanced Air Mobility (AAM). A tilt rotor type of vertical take-off and landing aircraft has been actively studied and developed. A tilt-rotor aircraft can perform a transition flight between vertical and horizontal flights. A blade pitch angle control system can be used for flight stability during transition flight time. In addition, Individual Blade Control (IBC) can reduce noise and vibration generated in transition flight. This paper proposed Disturbance Observer Based Control (DOBC) and Time Delay Control (TDC) for individual blade control of an Electro-Mechanical Actuator (EMA) based blade pitch angle control system. To compare and analyze proposed controllers, numerical simulations were conducted with DOBC and TDC.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.80-81
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• 2022

자율운항선박 원격제어시스템의 실증을 위하여 기존 육상제어센터에서 선박을 제어하는 것은 현재 개발중인 시스템으로 인한 선박의 안전성 확보에 어려움이 있다. 이에 본 연구에서는 원격제어시스템을 시험하기 위하여 선박에서 육상제어센터로 명령을 주어 선박과 육상제어센터 내 모사장치를 통한 원격제어시스템을 테스트하였다. 본선의 통신네트워크(LTE, VSAT)을 통해 선장의 명령으로 선박의 육상제어센터의 모사장치를 제어하였다. 1차 소각도를 이용한 원격제어시험과 2차 Zig-zag 테스트를 실시하여, 개별 시스템의 문제점을 식별하고, 개별 시스템간의 통합을 위한 방안을 제시하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.149-152
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• 2011

A Multi-Vision needs an image adjust of each product to make the same picture quality for all products when it's installed. Owing to this reason need individual control. This document request indivisual control method for each product with the Remote controller. To realize this method need make Set ID and Picture ID on the UI and need daisy chain of cable to connect Remocon code(IR Signal) In to Out, After allocation the Set ID for each product. Picture ID of the product which want to change picture quality make equal to Set ID. And the product which is same Set ID and Picture ID is only controlled through decoding of Remocon code to Scaler.