Mobile QR Code QR CODE : Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.

기상에 대한 동네예보를 활용한 제주도의 특수일 전력수요예측 알고리즘 Jeju Island's Special Day Load Forecasting Algorithm Using Dong-Nae Weather Forecasting

Se-Won Jo ; Rae-Jun Park ; Kyung-Bin Song

It is necessary to increase the accuracy of the load forecast by reflecting the characteristics of the load in Jeju and the effect of temperature on load when performing load forecast for Jeju special day. In order to the accuracy of load forecast, Jeju special day load forecasting algorithm that reflects the effect of temperature on load by using the Dong-Nae forecast provided by Korea Meteorological Administration is proposed. The proposed algorithm uses a fuzzy linear regression model to perform 24-hour special day load forecasting. Then, the load sensitivity for temperature per 3-hour for the special day is calculated using the load on the special day normalized by the basic load and temperature. Using load sensitivity for temperature, the effect of temperature on load is adjusted by the difference between the four days of weekday before special day and special day of the past three years and by the difference between the four days of weekday before the forecast day and forecast day. Case studies were performed for the proposed algorithm from 2014 to 2016. The accuracy of the proposed algorithm is improved by 41.51% from 5.42% to 3.17% on MAPE.

전기공학 교육을 위한 Steiner (Fermat) Tree 강의 Note - Minimum Spanning Tree와 Steiner Tree의 길이 비교 - A Lecture Note for Introduction of Steiner (Fermat) Tree to Electrical Engineering Education - Comparison of Path Lengths of Minimum Spanning Tree and Steiner Tree

Ju-Chul Kim ; Sang-Joong Lee

Steiner tree is a tool for finding a minimum path that connects all nodes by adding, if necessary, some extra nodes. Those extra nodes are called the Steiner points and the resultant tree is called the Steiner tree. This paper presents a lecture note to help readers better understand the usefulness of the Fermat point and Steiner tree. It compares the Steiner tree of three vertices of a triangle to the path lengths connected via the incenter, circumcenter, centroid, orthocenter and Fermat point, respectively, which shows that the Steiner tree is minimal. The authors recommend to include the Fermat point and Steiner tree in the college curriculum for electrical engineering education since it has a useful meaning in a physical and engineering point of view.

확률기반의 출력변동성을 고려한 풍력발전 전력망 연계 시나리오 개발 Scenario Developments for Integrating Wind Generating Resources into Power Grids considering the Probabilistic Variability Analysis

SunOh Kim ; Jin Hur

The importance of renewable energy in the power generation sector is increasing worldwide in response to greenhouses gases. South Korea is also trying to expand the proportion of renewable energy based on the "Renewable Energy 3020". Wind power generation which is variable power source, can affect the system reliability if it is integrated to the existing system. In order to solve this problem, it is necessary to analyze the characteristics and variation of wind power affected meteorological factors. In this paper, we develope integrating scenarios considering characteristics and variation of wind power outputs and simulate Jeju power system according to particular scenarios.

주거공간의 IT기기 장착을 위한 통합형 모듈에 관한 연구 Integrated Module Design for IT Equipment Installation in Residential Space

Hyunchul Choi ; Sihwa Bae ; Donghwa Shon

With increasing interest in healthcare services that manage health information in smart homes, the number of complex and diverse sensors in residential areas is increasing. However, when compared with the speed of development of IT devices, the architectural factors have a long life cycle and are slow to cope with the emergence of new IT devices. Therefore, smart devices are installed in a dwelling space in messy condition. For AAL(Ambient Assisted Living) to realize unconstrained, realistic, real-time, bidirectional services, it is necessary to design a fusion of residential space and IT devices. In the previous study, we designed an AAL frame, which is an infrastructure to accommodate electricity and communication lines. In this study, we design an AAL module which is a space to store devices in association with AAL frames. Considering the existing indoor finishing method, we review the location and space to embed the device, and propose a module that can be easily attached and detached while electricity and communication are transmitted.

편광상이 고리 구조 기반 1차 광섬유 복굴절 필터의 임의 스펙트럼 파장 연속 조절을 위한 편광 조건 연구 Study on Polarization Conditions for Continuous Wavelength Tuning of Arbitrary Spectrum of First-Order Fiber Birefringent Filter Based on Polarization-Diversified Loop Structure

Do Kyung Kim ; Yong Wook Lee

In this paper, we studied the polarization conditions for the continuous wavelength-control of arbitrary transmission spectra in a first-order fiber birefringent filter based on a polarization-diversified loop structure(PDLS). The PDLS-based first-order fiber birefringent filter is composed of a polarization beam splitter, two combinations of a half-wave plate and a quarter-wave plate, and two polarization-maintaining fiber segments. First, we explained the polarization conditions that should be satisfied to continuously tune the wavelength of the arbitrary transmittance function of the filter. Then, using a new approach to find the orientation angles of the waveplates, those waveplate angles, which could continuously shift the wavelength of the arbitrary transmittance function, were theoretically derived. Finally, we verified that the proposed approach can be applied to the implementation of wavelength tuning of any types of transmittance functions in the PDLS-based first-order fiber birefringent filter.

Support Vector Regression(SVR) 기반의 단기 태양광발전 예측시스템 개발에 관한 연구 A Study on the Development of the short-term Photovoltaic Power Forecasting System using Support Vector Regression (SVR)

Ki-Han Kim ; Jin Hur

Uncertainty and variability in photovoltaic power generation can cause instability in the power system. Accurate photovoltaic power generation forecasts are needed to reduce instability in the system of solar power generation. Forecasting is the most cost-effective method of improving the reliability of the system. In this paper, we propose the short-term photovoltaic power forecasting using support vector regression. Kriging method is used to estimate the solar irradiance of the solar plant. When forecasting solar power through the support vector regression model, the accuracy of the forecasting was high compared to other models.

SOFC 연료전지용 인버터 시스템의 특성 및 필터에 관한 연구 A Study on the characteristic and filter of Inverter system for Solid Oxide Fuel Cell

Gye-Ho Hwang ; Bong-Seob Lee

Recently, a fuel cell stack having advantages of reducing or increasing the number of stack cells of the fuel cell, reducing the cost of the product, facilitating the fabrication, reducing the failure rate, and extending the life of the stack by increasing the output voltage is generally in progress. Particularly, a solid oxide fuel cell (SOFC) fuel cell has advantages of increasing the number of stack cells to increase the voltage per cell (low current output), lowering the manufacturing cost of the inverter, and increasing the number of stack cells, The fuel cell stack has been actively studied. As the number of stacked solid oxide fuel cell (SOFC) cells increases with the input of the inverter in the direction corresponding to the increase of the voltage per cell, the high efficiency and low efficiency inverter with high voltage and low current are being actively studied. In this paper, we analyze the research direction and the optimum circuit topology of the inverter which is the essential equipment to convert the fuel cell output to the domestic power source, and make prototype, performance test, We test the performance and verify the performance of filter design, filter prototype manufacturing, electromagnetic wave test and filter considering newly added electromagnetic field test.