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발전기 동기투입시간 단축을 위한 제어 신호 최적화 알고리즘에 관한 연구
유제호,이준석,위영민,조수환 대한전기학회 2023 전기학회논문지 Vol.72 No.8
To connect a generator to a power system in operation, a synchronization process is required to match their voltage magnitudes, frequencies, and phase angles. Since it is impossible to change the voltage magnitude and frequency of the power system, the generator must be synchronized to match them. In the past, a skilled operator manually adjusted the generator’s voltage to achieve synchronization, but nowadays an Auto-Synchronizer (Device 25A) is used for faster and more accurate synchronization. The auto-synchronizer adjusts the generator's voltage magnitude and frequency to match those of the power system by sending control signals to the generator. However, because the device lacks information about the response characteristics of the generator system, it commonly use a method that involves sending short-duration pulses at regular intervals and performing feedback control until the target values are reached. This is a very stable control method that does not cause overshoots, but it takes a long time because many loops are repeated until the target value is reached. This paper is written to propose an algorithm to shorten the time required to synchronize a generator by estimating the response characteristics of the generator and optimizing the control signal to reduce the number of feedback control loops.
Advanced Railway Power Quality Detecting Algorithm Using a Combined TEO and STFT Method
유제호,신승권,박종영,조수환 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
Because an electric railway vehicle is a large scale moving load, it can cause various kinds of power quality problems in the railroad power system. The power quality impacts are considered as the strong instantaneous stresses to the related power systems and can cause an accelerating aging and a malfunction of the power supplying components. Therefore, it is necessary to detect the small and intermittent symptoms mixed in the voltage waveform. However, they cannot be detected by the triggering functions of the existing power analyzers installed in the railway systems. This paper will examine the drawback of some fast detection tools and propose an advanced detecting and analyzing method based on a combined TEO and STFT algorithm.