• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.50-52
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• 2005

Research interests in PQ(Power Quality) measurement and monitoring system have been increased. This paper describes an experimental result for monitoring system that monitors power quality and undesirable accidents when distributed generations are connected to the power grid. Prior to develop a physical monitoring system for distributed generation applications, we constitute a mesuring system for the general PQ factors. In this paper, an approach to how to measure the PQ elements is presented by using TMS320C6701 processor. Simulation results using the PSCAD and the power system simulation equipment Dobel have verified the proposed measurement system.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.312-317
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• 2007

최근 다수의 태양광 발전기가 배전계통에 연계되고 있으며 특히, 특정지역을 중심으로 대규모의 태양광발전 단지가 구성되어 배전계통에 연계되고 실정이다. 본 논문에서는 순천에 구축된 l000KW급 태양광발전소의 계통해석영향을 분석하기 위하여 PSCAD/EMTDC 툴을 이용하여 모델링 하고 태양광발전이 연계된 배전계통 조류해석과 태양광 발전의 출력에 의한 22.9KV 배전계통의 전압변동을 시뮬레이션 하였으며, 태양광발전에 따른 역조류에 의한 배전계통 전압변동을 분석하였다. 또한, 태양광발전기의 배전계통 연계 전,후의 배전선로의 임의의 지락고장 모의로 태양광발전기가 고장전류에 미치는 영향 분석과 태양광 발전이 양호, 불량한 경우에 대한 상전압, 고조파 전류, 역률 등의 측정결과에 의한 전력품질을 분석 하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.5
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• pp.789-796
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• 2008

This paper describes a single-phase active power filter based on a newly developed digital controller. The developed controller utilizes FFT(Fast Fourier Transform) algorithm to extract the reference signal from the load current, considering the phase-angle delay of each order of harmonics. Optimized technique was applied for whole control algorithm to implement the real-time operation of developed controller. The performance of developed controller for a single-phase active power filter was verified through computer simulations with PSCAD/EMTDC. The feasibility of hardware implementation was confirmed by building and testing a prototype. The developed digital controller for a single-phase active power filter can compensate the harmonic current generated by the power supply for digital equipment.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.265-266
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• 2008

The interest on harmonics which is one of the matters related with power quality problem is not limited in only the system where the large scale industrial load is connected. The harmonics phenomenon not only causes the malfunction of devices, but also lowers the energy efficiency of power system. This paper focuses on the harmonic analysis process to establish the harmonic mitigation method, considering the harmonics distortion as a major cause to reduce the energy efficiency of a skyscraper. A system diagram of building is modelled with PSCAD simulator. Based on the harmonic analysis results of it, the electrical locations with the high priority to install the mitigating devices are selected. Finally, the result of PSCAD simulations and the site-measured data are compared, verifying that they reach a common conclusion.

• Proceedings of the KIEE Conference
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• 2008.10c
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• pp.164-166
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• 2008

본 논문은 계통연계형 열병합발전의 동작특성을 모의하는 시뮬레이션모델에 관해 기술하고 있다. 계통연계형 열병합발전은 가스엔진, 영구자석발전기, 전력변환기로 구성되어 있는데 본 연구에서는 가스엔진은 일정출력을 공급하고 다극형 영구자석발전기에서 생산되는 400Hz 출력을 컨버터와 인버터를 통하여 상용주파수의 교류로 전력계통과 연계하는 것으로 가정하였다 개발된 시뮬레이션모델은 PSCAD/EMTDC를 이용하였고 전력회로는 내장모듈을 그리고 제어기는 C 프로그램으로 직접 개발하였다. 개발된 PSCAD/EMTDC 시뮬레이션모델을 이용한 다양한 시뮬레이션을 실시하여 하드웨어 시뮬레이터를 설계하였다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.63 no.2
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• pp.74-80
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• 2014

Generator protection device has to detects an internal fault conditions in generator and abnormal operating conditions must be due to the hazards. Loss of excitation may cause generator itself failure as well as serious operating problem in power system, and then requires an appropriate response of generator protection device. Details modeling of generator control system and analysis of transient states in generator are important for optimal operation in power plants. In addition, the fault simulation data are also used for testing the characteristics of IED. In this paper, the hydro generator control system using PSCAD/EMTDC, visual simulation for power systems, was modeled. The generator control system which is composed of generator, turbine, exciter, governor was implemented. The parameters of generator control system model were obtained from field power plant. Loss of excitation simulations were performed while varying the fixed load. Several signals analysis were also performed so as to analyze transients phenomena.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.66 no.1
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• pp.15-20
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• 2017

In order to advance and improve the performance of domestic aged power plants, IEDs have been developed for power generation systems. For smooth installation and operation of the protection relays, a detail settings study of IED is required. This paper deals with an analysis based on PSCAD and setting investigation of IED for loss of field, reverse power protection in Small Hydro Generation System.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.3
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• pp.152-160
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• 2004

A novel UPQC(Unified Power Quality Conditioner), which consists of series inverter, shunt inverter, distributed generation system, is proposed. The proposing system can compensate reactive power, harmonics, voltage sag and swell, voltage interruption etc. through the change of paralleling operation mode and islanding operation mode. The control strategy for the proposing system was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the PSCAD/EMTDC simulation and the experimental work with the hardware prototype. The proposing system has the ultimate capability of improving power quality at the point of installation on power distribution systems or Industrial power systems and can be utilized for the custom power device in th future distribution system.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.4
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• pp.199-207
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• 2004

The 765(㎸) transformer is operated using two parallel tanks because of its high capacity. The protective relay (61) for the current phase balance of a 765(㎸) transformer would misoperate by excessively, circulation current of each tanks caused by a mismatch of ULTC Tap. In this paper, the phenomenon was analyzed, and the setting rules of relay for bank protection are studied. The result of analysis is verified by the simulation of 765(㎸) transformer with the Power Systems Computer Aided Design(PSCAD). Thereby an appropriate setting rule of the current phase balance relay is recommended.

• Journal of Electrical Engineering and Technology
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• v.1 no.4
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• pp.503-512
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• 2006

This paper proposes a new configuration for the Unified Power Quality Conditioner, which has a DC/DC converter with super-capacitors for energy storage. The proposed UPQC can compensate the reactive power, harmonic current, voltage sag and swell, voltage imbalance, and voltage interruption. The performance of the proposed system was analyzed through simulations with PSCAD/EMTDC software. The feasibility of system implementation is confirmed through experimental works with a prototype. The proposed UPQC has ultimate capability to improve the power quality at the point of installation on power distribution systems and industrial power systems.