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1-cycle RMS를 이용한 독립계통용 디젤발전기의 자동전압제어장치 성능 개선에 관한 연구
유준수(Joon-Soo Lyu),배민식(Min-Sik Bae),조수환(Soo-Hwan Cho) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.1
Since the power system in an island area is generally small-scale and not connected to the main land, it should be able to operate independently. And the power is mainly supplied by diesel generators. Under these circumstances, the frequency variation occurs easily when a variable load with a large capacity is operated during the diesel generator start-up or stand-alone operation. So, AVR(Automatic Voltage Regulator) unit generally used in the main land, which is based on 60 Hz fundamental frequency DFT(Discrete Fourier Transform) algorithm, cannot control the voltage reliably and immediately due to the error of voltage effective value caused by the system frequency fluctuation. In this study, the performance of the AVR unit with 1-cycle RMS(Root Mean Square) algorithm, which enables stable voltage control despite frequency variation, was developed and demonstrated through field application tests.
TEO&DESA를 활용한 Auto-synchronizer의 전압 파라미터 측정에 관한 연구
신훈철(Hoon-Chul Shin),한수경(Soo-Kyeong Han),유준수(Joon-Soo Lyu),조수환(Soo-Hwan Cho) 대한전기학회 2018 전기학회논문지 Vol.67 No.7
The Auto-synchronizer is essential equipment for synchronizing a generator to the power system. It is performing that measurement of the magnitude, frequency and phase of the voltage signal of the power system and generator. It is important to select the appropriate measurement algorithm for preventing various problem such as mechanical stress and Electrical problem. Teager Energy Operator(TEO) and Discrete separation algorithm(DESA) is measurable the instantaneous parameters of a sine wave using 5 samples and can be measured at a fast and with a simple operation. Therefore it has many advantages in measuring the parameters. In this paper, it confirmed measurement results using matlab simulations when there are synchronized in order of frequency, magnitude. Also it presented methods using digital filters and sample intervals to improve accuracy.