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지평식,한운동 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2
In this research, characteristics of electric energy saving equipments, which were produced by several companies, were analyzed. Output voltage of equipment was 208[V] when input was220[V]. Change of harmonics and power factor cannot be observed in experiments. voltage variance was in limitations. But illumination and lift decrease of lighting fixtures and rotating characteristics change of motors can be anticipated.
池平植,趙武濟 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-
This paper proposed a new method for artificial networks(ANNs) based on induction motor for load modeling in power system. The training data originating from experiment device. The recurrent neural network demonstrates improved accuracy over conventionally trained layered perceptron when applied to the problem of dynamic characteristic of induction motor and induction generator.
다항회귀모델의 잔차 정보를 이용한 교류 직렬 아크검출 알고리즘 개발
지평식 대한전기학회 2022 전기학회논문지 P Vol.71 No.3
In this paper, an AC series arc detection algorithm using residual information of a polynomial regression model was developed. The developed algorithm calculates the multiple regression model equation using the given data, and then determines whether there is an arc based on the residual information between the given data and the estimated values calculated by the multiple regression model. The calculation speed was improved by resampling the acquired data to calculate the multiple regression model equation. In order to verify the validity of the proposed method, the mean square error criterion for data with an absolute residual of 0.14 or more was set to 0.1, and as a result of the experiment, the arc and normal data detection performance was 100%, thus verifying the validity of the proposed method.
지평식 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
Increasingly nonlinear dynamic loads such as personal computer, laser printers, variable speed drivers, and various solid-state electronic equipment have led to harmonics in the power system. Harmonics can cause a variety problem such as waveform distribution, improper voltage readings, and especially load modeling. In this study, we developed harmonics analysis technique based load modeling method with harmonic components. In traditional load modeling techniques, the harmonics has not been considered. Thus, the harmonics problems in load modeling are considered To show the effectiveness, the proposed method has been intensively tested with various dataset acquired under the different frequency and voltage and compared it with conventional methods such as IEEE 2nd equation method with harmonic components.
지평식 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
Accurate load model is a key requirement for the planning and economic and secure operation of modern power systems. However, conventional load modeling methods are not effectively estimate load model in environments with harmonics because they are implemented by considering of the voltage and frequency without harmonic factors. Therefore, load model should be designed by harmonics information as well as voltage and frequency factors. In this study, we analyzed load characteristics according to existence and nonexistence of harmonics. For this, we make various experiments according to harmonics for residential loads composed of individual and composite loads. This research will make full use to develop accurate load modeling considering of harmonics.
지평식,한운동 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.1
Harmonics happened due to nonlinear systems such as UPS, SCR controlled motors, and fluorescent lighting in distribute power system is very important subject to optimal operate and control of power system. Harmonics sometimes takes place incorrect operation of protective relaying system under normal condition on power system. This paper presents the actual recording data of transformer located at substation of industrial installation for harmonic analysis in detail.