• Journal of Electrical Engineering and Technology
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• v.13 no.1
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• pp.270-279
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• 2018

This paper elucidates a hysteresis current controller for enhancing the performance of static synchronous compensator (STATCOM) using cascaded H-bridge multilevel inverter. Due to the rising power demand and growing conventional generation costs a new alternative in renewable energy source is gaining popularity and recognition. A five level single phase cascaded multilevel inverter with two separated dc sources, which is energized by photovoltaic - wind hybrid energy source. The voltages across the each dc source is balanced and standardized by the proposed hysteresis current controller. The performance of STATCOM is analyzed by connecting with grid connected system, under the steady state & dynamic state. To reduce the Total Harmonic Distortion (THD) and to improve the output voltage, closed loop hysteresis current control is achieved using PLL and PI controller. The performance of the proposed system is scrutinized through various simulation results using matlab/simulink and hardware results are also verified with simulation results.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.6
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• pp.166-175
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• 1999

This paper describes a design and performance evaluation of robust controller which overrides unstable motion and pulls out quickly after water entry of underwater vehicle dropped from aircraft or surface ship. We use 6-DOF equation for model of motions and assume parameter uncertainty to reflect the difference of real motion from modelled motion equation. we represent a nonlinear system with uncertainty as Takagi and Sugeno's(T-S) fuzzy models and design controller stabilizing them. The fuzzy controller utilizes the concept of so-called parallel distributed compensation (PDC). Finally, we confirm stability and performance of the controller through computer simulation and hardware in the loop simulation (HILS).

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2213-2220
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• 2017

This paper proposes an efficient approach for hardware implementation of moving object detection (MOD) processor using effective Gaussian mixture learning (EGML)-based background subtraction method. Arithmetic units used in background generation were implemented using LUT-based approximation to reduce hardware complexity. Hardware resources used for both background subtraction and Gaussian probability density calculation were shared. The MOD processor was verified by FPGA-in-the-loop simulation using MATLAB/Simulink. The MOD performance was evaluated by using six types of video defined in IEEE CDW-2014 dataset, which resulted the average of recall value of 0.7700, the average of precision value of 0.7170, and the average of F-measure value of 0.7293. The MOD processor was implemented with 882 slices and block RAM of $146{\times}36kbits$ on Virtex5 FPGA, resulting in 60% hardware reduction compared to conventional design based on EGML. It was estimated that the MOD processor could operate with 75 MHz clock, resulting in real-time processing of $800{\times}600$ video with a frame rate of 39 fps.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1819-1820
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• 2007

국제해사기구(IMO: International Maritime Organization)의 선박 조종성능에 관한 기준이 발효되고, 최근 환경에 대한 관심이 지속적으로 증가하는 것과 더불어 항해 안전성, 특히 해난사고에 기인한 해양오염 방지에 관한 관심이 증가함에 따라 초기 설계단계에서부터 선박의 조종성능을 정확히 추정하는 것이 매우 중요하게 되었다. 본 논문에서는 선박 조종성능을 추정할 수 있도록 선박 고유 조종 운동 특성을 선박운항에 관련한 항해센서와 함께 선박 운항에 동일한 운전 조건으로 구성하고 HILS(Hardware In the Loop Simulation)을 적용하여 선박조종 신뢰성을 향상 시킬 수 있는 방법을 제시한다.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.619-622
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• 1986

컴퓨터 기술의 발달에 따라 디지탈 전산기는 연산처리 능력이 더욱 빨라지고, 더욱 큰 기억용량을 갖게 되었다. 따라서 산업공정, 화학프랜트, 원자력발전 및 항공분야 등의 복잡한 연속 동특성계에 대한 실시간 시뮬레이션이 가능하게 되었다. 특히 복잡한 연속 동특성계의 시뮬레이션 목적으로 Multiprocessor 형태의 전산기가 개발되었다. 이 Multiprocessor형태의 전산기는 D/A 변환기와 A/D 변환기를 갖추므로써 실시간 실물 모의시험(A real time hardware-in-the-loop simulation) 시의 컴퓨터와 외부장비와의 데이타 전달이 용이하여 졌다. 본 연구에서는 비행체의 비행자세를 제어하기 위한 조종장치의 설계해석 및 성능시험을 위하여 Multiprocessor를 이용하여 실시간 실물 모의실험이 가능함을 보였다. 본 시뮬레이션에 사용된 전산기는 AD10 전산기이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.796-799
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• 2009

재해 및 재난 발생에 따른 피해를 최소화하고자 무인헬기 기술과 IT기술의 실시간 방재 시스템을 융합하여 광범위한 환경을 대상으로 실시간 다각적 정보수집 기능을 제공하는 연구가 진행 중이다. 소형무인헬기에 개량된 자동항법기능과 무선 네트워크 기반의 실시간 멀티미디어 중계기능을 탑재하고 쉽게 사용 할 수 있는 지상관제시스템을 개발하여 대형재난 현장에 사용하면 다각적 동영상과 재해 현장 정보를 실시간으로 제공함으로써 초기 대응을 할 수 있어 재난의 확산을 최대한 방지 할 수 있다. 본 논문에서는 이러한 시스템을 보다 효과적으로 개발하기 위한 HILS(Hardware in the Loop Simulation) 기반 무인헬기 시뮬레이션 환경을 개발하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.219-220
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• 2016

A power management system (PMS) has been an important part in a ship integrated control system. To evaluate a PMS for a liquefied natural gas carrier (LNGC), this research proposes a real-time hardware-in-the-loop simulation (HILS), which is composed of major component models such as turbine generator, diesel generator, governor, circuit breaker, and 3-phase loads on MATLAB/Simulink. In addition, FPGA based control console and main switchboard (MSBD) are constructed in order to develop an efficient control and a similar real environment in an LNGC PMS. A comparative study on the performance evaluation of PMS functions is conducted using two test cases for sharing electric power to consumers in an LNGC. The result shows that the proposed system has a high verification capability for the operating function and failure insertion evaluation as a PMS simulator.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.4
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• pp.867-875
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• 2019

Security awareness and training are becoming more important as cyber security incidents tend to increase in industrial control systems, including nuclear power plants. For effective cyber security awareness and training for the personnel who manage and operate the target facility, a TEST-BED is required that can analyze the impact of cyber attacks from the sensor level to the operation status of the nuclear power plant. In this paper, we have developed an HIL system for nuclear power plant cyber security training. It includes nuclear power plant status simulations and specific system status simulation together with physical devices. This research result will be used for the specialized cyber security training program for Korean nuclear facilities.

• Journal of Astronomy and Space Sciences
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• v.20 no.4
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• pp.339-350
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• 2003

Engineering qualification model payload for a communications and broadcasting satellite(CBS) was developed by ETRI from May, 2000 to April, 2003. For. the purpose of functional test and verification of the payload, a real-time hardware-in-the-loop(HITL) CBS simulator(CBSSIM) was also developed. We assumed that the spacecraft platform for the CBSSIM is a geostationary communication satellite using momentum bias three-axis stabilization control technique based on Koreasat. The payload hardware is combined with CBSSIM via Power, Command and Telemetry System(PCTS) of Electrical Ground Support Equipment(EGSE). CBSSIM is connected with PCTS by TCP/IP and the payload is combined with PCTS by MIL-STD-1553B protocol and DC harness. This simulator runs under the PC-based simulation environment with Windows 2000 operating system. The satellite commands from the operators are transferred to the payload or bus subsystem models through the real-time process block in the simulator. Design requirements of the CBSSIM are to operate in real-time and generate telemetry. CBSSIM provides various graphic monitoring interfaces and control functions and supports both pre-launch and after-launch of a communication satellite system. In this paper, the HITL simulator system including CBSSIM, communications payload and PCTS as the medium of interface between CBSSIM and communications payload will be described in aspects of the system architecture, spacecraft models, and simulator operation environment.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.10
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• pp.1448-1453
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• 2015

In this paper, we propose an alternative method of communication to improve the reliability of in-vehicle networks by jointly using wireless communication networks. Wired Communication networks have been used in vehicles for the monitoring and the control of vehicle motion, however, the disconnection of wires or hardware fault of networks may cause a critical problem in vehicles. If the network manager detects a disconnection or faults in wired in-vehicle network like the Controller Area Network(CAN), it can redirect the communication path from the wired to the wireless communication like the Zigbee network. To show the validity and the effectiveness of the proposed in-vehicle network architecture, we implement the Electronic Stability Control(ESC) system as ECU-In-the-Loop Simulation(EILS) and verify that the control performance can be kept well even if some hardware faults like disconnection of wires occur.