Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.053
JuChul Kim, SangJoong Lee
The ‘Equivalent resistance method’ has been used in the field for a very long time to calculate the voltages in distribution power systems. IEC 60364 standard also recommends this method because it yields an approximate but a fairly reliable solution using a scientific calculator. Cosθ and sinθ terms of the complex line current are included in the ‘Equivalent resistance method’, however, the authors found out that there is an overlapping calculation between the magnitude of line current and its values of cosθ, sinθ. This paper proposes a modified formula in which the cosθ and sinθ terms included in the conventional formula are eliminated. An example calculation for a distribution line with two load points is illustrated to compare the results by modified formula with those by conventional formula, by which we can see the effectiveness of the proposed formula. It is expected that the simplified formula with no θ terms could help electrical engineers calculate the voltages of distribution power systems in a more convenient way using a scientific calculator.
{"title":"Voltage Calculation of Distribution Line Using Modified Equivalent Resistance Method with no Angle θ Terms","authors":"JuChul Kim, SangJoong Lee","doi":"10.5207/jieie.2023.37.5.053","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.053","url":null,"abstract":"The ‘Equivalent resistance method’ has been used in the field for a very long time to calculate the voltages in distribution power systems. IEC 60364 standard also recommends this method because it yields an approximate but a fairly reliable solution using a scientific calculator. Cosθ and sinθ terms of the complex line current are included in the ‘Equivalent resistance method’, however, the authors found out that there is an overlapping calculation between the magnitude of line current and its values of cosθ, sinθ. This paper proposes a modified formula in which the cosθ and sinθ terms included in the conventional formula are eliminated. An example calculation for a distribution line with two load points is illustrated to compare the results by modified formula with those by conventional formula, by which we can see the effectiveness of the proposed formula. It is expected that the simplified formula with no θ terms could help electrical engineers calculate the voltages of distribution power systems in a more convenient way using a scientific calculator.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"79 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135979980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.062
Tae-Hee Han, Seok-Cheol Ko, Sung-Hun Lim
Three-phase transformer type superconducting fault current limiter(SFCL) using secondary windings with non-isolation, which consisted of three-phase transformer windings wound on three legs of E-I iron core and three superconducting modules(SCMs), were suggested and its fault current limiting operations according to ground-fault types were analyzed. To verify the effective operation of three-phase transformer type SFCL using secondary windings with non-isolation, the unsymmetrical ground and the symmetrical ground faults were applied into three-phase power simulated system with the suggested SFCL. From the analysis on the experiment, three-phase transformer type SFCL using secondary windings with non-isolation showed lower power burden of three SCMs compared to the SFCL using secondary winding with isolation, especially in case of an unsymmetrical ground fault occurrence.
{"title":"Analysis on Fault Current Limiting Operations of Three-Phase Transformer Type SFCL Using Secondary Windings with Non-Isolation","authors":"Tae-Hee Han, Seok-Cheol Ko, Sung-Hun Lim","doi":"10.5207/jieie.2023.37.5.062","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.062","url":null,"abstract":"Three-phase transformer type superconducting fault current limiter(SFCL) using secondary windings with non-isolation, which consisted of three-phase transformer windings wound on three legs of E-I iron core and three superconducting modules(SCMs), were suggested and its fault current limiting operations according to ground-fault types were analyzed. To verify the effective operation of three-phase transformer type SFCL using secondary windings with non-isolation, the unsymmetrical ground and the symmetrical ground faults were applied into three-phase power simulated system with the suggested SFCL. From the analysis on the experiment, three-phase transformer type SFCL using secondary windings with non-isolation showed lower power burden of three SCMs compared to the SFCL using secondary winding with isolation, especially in case of an unsymmetrical ground fault occurrence.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"79 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135979986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.001
Hye-Jin Shin, Ji-Young Seo, An-Seop Choi
CAI(Comprehensive air-quality index) is a value developed to minimize and prevent damage from air pollution. It takes into account the levels of six air pollutants and expresses them in four levels and colors. “Good” is blue, “normal” is green, “poor” is yellow, and “very poor” is red. This paper proposes using IoT lighting control to indicate air quality. Furthermore, it provides information on the CAI of all areas in Seoul through a webpage. IoT lights are installed on window frames or entrances to enable the implementation of action guidelines suggested by the Ministry of Environment.
{"title":"Visual Representation of Real-Time Comprehensive Air-Quality Index with IoT Lighting Control","authors":"Hye-Jin Shin, Ji-Young Seo, An-Seop Choi","doi":"10.5207/jieie.2023.37.5.001","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.001","url":null,"abstract":"CAI(Comprehensive air-quality index) is a value developed to minimize and prevent damage from air pollution. It takes into account the levels of six air pollutants and expresses them in four levels and colors. “Good” is blue, “normal” is green, “poor” is yellow, and “very poor” is red. This paper proposes using IoT lighting control to indicate air quality. Furthermore, it provides information on the CAI of all areas in Seoul through a webpage. IoT lights are installed on window frames or entrances to enable the implementation of action guidelines suggested by the Ministry of Environment.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.070
Kyung-Min Lee, Chul-Won Park
Recently, there has been growing interest in applying AI (artificial intelligence) technology to predict electric motor defect, perform prevention and maintenance, and reduce recovery costs and losses. This paper proposes an AI-based state discriminator for the electric motor system to improve the existing EOCR into a smart EOCR by adding the predictive maintenance function of the CLOUD environment. Firstly, the smart EOCR based motor system is introduced. Next, five state learning data sets collected from the motor system are constructed. After designing a state discriminator with DNN (Deep Neural Network), a widely used AI technique, and implementing it using the Python language. We prove the effectiveness of the state discriminator.
{"title":"AI Based State Discriminator of Motor System for Smart EOCR","authors":"Kyung-Min Lee, Chul-Won Park","doi":"10.5207/jieie.2023.37.5.070","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.070","url":null,"abstract":"Recently, there has been growing interest in applying AI (artificial intelligence) technology to predict electric motor defect, perform prevention and maintenance, and reduce recovery costs and losses. This paper proposes an AI-based state discriminator for the electric motor system to improve the existing EOCR into a smart EOCR by adding the predictive maintenance function of the CLOUD environment. Firstly, the smart EOCR based motor system is introduced. Next, five state learning data sets collected from the motor system are constructed. After designing a state discriminator with DNN (Deep Neural Network), a widely used AI technique, and implementing it using the Python language. We prove the effectiveness of the state discriminator.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"204 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.046
Minchan Bae, Jaeho Seo, Yong-Wook Lee
In this paper, we investigated the continuous wavelength tuning capability of an arbitrarily selected transmission spectrum(ASTS) in optical fiber multiwavelength filter using heterogeneous wave retarder combination. The multiwavelength filter consists of a polarization beam splitter(PBS), two polarization-maintaining fiber(PMF) segments of the same length(∼7.12m), a wave retarder combination of a half-wave retarder(HWR) and a quarter-wave retarder(QWR), and another wave retarder combination of two QWRs, forming a polarization-diversity loop. The theoretical transmittance function of the filter was derived using the Jones matrix formulation. For an ASTS obtained at a specific set of orientation angles of the four wave retarders, we identified the wave retarder orientation angles that allowed the ASTS to be continuously shifted. Wavelength tuning was implemented by shifting all polarization states on the output polarization trace of the second PMF in the direction of wavelength decrease. From the identified sets of the wave retarder orientation angles, we calculated eight transmission spectra whose wavelengths were tuned by 0.1nm. Finally, these calculation results were experimentally verified.
{"title":"Study on Continuous Wavelength Tuning of Arbitrarily Selected Transmission Spectrum in Optical Fiber Multiwavelength Filter Using Heterogeneous Wave Retarder Combination","authors":"Minchan Bae, Jaeho Seo, Yong-Wook Lee","doi":"10.5207/jieie.2023.37.5.046","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.046","url":null,"abstract":"In this paper, we investigated the continuous wavelength tuning capability of an arbitrarily selected transmission spectrum(ASTS) in optical fiber multiwavelength filter using heterogeneous wave retarder combination. The multiwavelength filter consists of a polarization beam splitter(PBS), two polarization-maintaining fiber(PMF) segments of the same length(∼7.12m), a wave retarder combination of a half-wave retarder(HWR) and a quarter-wave retarder(QWR), and another wave retarder combination of two QWRs, forming a polarization-diversity loop. The theoretical transmittance function of the filter was derived using the Jones matrix formulation. For an ASTS obtained at a specific set of orientation angles of the four wave retarders, we identified the wave retarder orientation angles that allowed the ASTS to be continuously shifted. Wavelength tuning was implemented by shifting all polarization states on the output polarization trace of the second PMF in the direction of wavelength decrease. From the identified sets of the wave retarder orientation angles, we calculated eight transmission spectra whose wavelengths were tuned by 0.1nm. Finally, these calculation results were experimentally verified.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Currently, many stand-alone microgrids are operated based on diesel generators. However, due to economic and environmental issues, it is imperative to enhance the utilization of renewable energy sources such as photovoltaic(PV) and wind turbine(WT). Nevertheless, renewable energy sources have intermittent characteristics, which can lead to problems such as reverse flow, voltage fluctuations, and exceeding current limits. In general, energy storage systems(ESS) can solve these issues. This paper presents a power sharing control algorithm between diesel generator and ESS to control the net load variation in stand-alone microgrids. The proposed method dynamically adjusts the power sharing ratio based on the magnitude and sign of net load variation and the state of charge(SOC) of the ESS. This allows the SOC of the ESS to be maintained within the allowable range, enabling the proper sharing of power output between the diesel generator and the ESS. The effectiveness of the proposed approach is verified through various simulation scenarios utilizing a MATLAB/Simulink model.
{"title":"Power Sharing Control between Diesel Generator and ESS in a Stand-Alone Microgrid","authors":"Yon-Hum Choi, Joon-Ho Choi, Sang-Yun Yun, Seon-Ju Ahn","doi":"10.5207/jieie.2023.37.5.029","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.029","url":null,"abstract":"Currently, many stand-alone microgrids are operated based on diesel generators. However, due to economic and environmental issues, it is imperative to enhance the utilization of renewable energy sources such as photovoltaic(PV) and wind turbine(WT). Nevertheless, renewable energy sources have intermittent characteristics, which can lead to problems such as reverse flow, voltage fluctuations, and exceeding current limits. In general, energy storage systems(ESS) can solve these issues. This paper presents a power sharing control algorithm between diesel generator and ESS to control the net load variation in stand-alone microgrids. The proposed method dynamically adjusts the power sharing ratio based on the magnitude and sign of net load variation and the state of charge(SOC) of the ESS. This allows the SOC of the ESS to be maintained within the allowable range, enabling the proper sharing of power output between the diesel generator and the ESS. The effectiveness of the proposed approach is verified through various simulation scenarios utilizing a MATLAB/Simulink model.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135979985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.082
Minchan Bae, Jaeho Seo, Yong-Wook Lee
In this study, we scrutinized the continuous wavelength tuning capability of a general comb spectrum(GCS) in an optical fiber comb filter using dual 1/4 waveplates. The comb filter is based on a polarization-diversity loop structure composed of a polarizing beam splitter, two equal-length segement of polarization-maintaining fiber(PMF), dual 1/4 waveplates located before one PMF segment, and a set of 1/2 waveplate and 1/4 waveplate positioned before the other PMF segment. Using the Jones calculus, we formulated the transfer matrix of the filter and draw out the filter transmittance function through this formulation. For a GCS obtained at a specific set of azimuth angles of the four waveplates, we found the waveplate azimuth angles that allowed the GCS to be continuously wavelength-tuned. These waveplate angle sets for the continuous wavelength tuning were identified using the relationship between the filter transmittance and the spectral evolution of the output polarization of the second PMF. From the identified sets of the waveplate angles, we calculated eight comb spectra whose wavelengths were tuned by 0.1nm, and then these theoretical results were experimentally demonstrated.
{"title":"Study on Continuous Wavelength Tuning of General Comb Spectrum in First-Order Optical Fiber Comb Filter Using Dual 1/4 Waveplates","authors":"Minchan Bae, Jaeho Seo, Yong-Wook Lee","doi":"10.5207/jieie.2023.37.5.082","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.082","url":null,"abstract":"In this study, we scrutinized the continuous wavelength tuning capability of a general comb spectrum(GCS) in an optical fiber comb filter using dual 1/4 waveplates. The comb filter is based on a polarization-diversity loop structure composed of a polarizing beam splitter, two equal-length segement of polarization-maintaining fiber(PMF), dual 1/4 waveplates located before one PMF segment, and a set of 1/2 waveplate and 1/4 waveplate positioned before the other PMF segment. Using the Jones calculus, we formulated the transfer matrix of the filter and draw out the filter transmittance function through this formulation. For a GCS obtained at a specific set of azimuth angles of the four waveplates, we found the waveplate azimuth angles that allowed the GCS to be continuously wavelength-tuned. These waveplate angle sets for the continuous wavelength tuning were identified using the relationship between the filter transmittance and the spectral evolution of the output polarization of the second PMF. From the identified sets of the waveplate angles, we calculated eight comb spectra whose wavelengths were tuned by 0.1nm, and then these theoretical results were experimentally demonstrated.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"76 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.021
Jung-Sung Park, Sang-Hyun Lee, Yun-Hyuk Choi
In accordance with climate change and renewable energy supply policies, power generation using fossil fuels is gradually decreasing, and renewable energy generation that replaces them is increasing.From the consumer’s point of view, self-generation and consumption using solar panels are increasing.BR Therefore, in this paper, we develop a P2P energy trading platform that allows individuals to directly trade surplus electricity through self-generation, and propose a methodology for energy prosumer to efficiently trade electricity using a business model. In addition, the economic analysis of the business model was analyzed by comparing the electricity rates of prosumer and general consumers using this platform.
{"title":"Development of P2P Energy Trading Platform for Energy Efficiency of Self-Generation Resources","authors":"Jung-Sung Park, Sang-Hyun Lee, Yun-Hyuk Choi","doi":"10.5207/jieie.2023.37.5.021","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.021","url":null,"abstract":"In accordance with climate change and renewable energy supply policies, power generation using fossil fuels is gradually decreasing, and renewable energy generation that replaces them is increasing.From the consumer’s point of view, self-generation and consumption using solar panels are increasing.BR Therefore, in this paper, we develop a P2P energy trading platform that allows individuals to directly trade surplus electricity through self-generation, and propose a methodology for energy prosumer to efficiently trade electricity using a business model. In addition, the economic analysis of the business model was analyzed by comparing the electricity rates of prosumer and general consumers using this platform.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.039
Kyung-Min Lee, Chul-Won Park
We propose a load flow technique as part of research on the optimal design and operation of hybrid power network. This is a new technique based on the Newton-Raphson calculation that can calculate and analyze the power flows of AC, DC and hybrid power network. The proposed technique is designed and implemented with MATLAB. After selecting IEEE’s AC 9 Bus, DC 5 Bus, and Hybrid 13 Bus model, we compare their performance through conventional AC load flow technique, DC load flow technique and PSCAD comparison simulation.
{"title":"A Study on Load Flow Technique for Hybrid Power Network","authors":"Kyung-Min Lee, Chul-Won Park","doi":"10.5207/jieie.2023.37.5.039","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.039","url":null,"abstract":"We propose a load flow technique as part of research on the optimal design and operation of hybrid power network. This is a new technique based on the Newton-Raphson calculation that can calculate and analyze the power flows of AC, DC and hybrid power network. The proposed technique is designed and implemented with MATLAB. After selecting IEEE’s AC 9 Bus, DC 5 Bus, and Hybrid 13 Bus model, we compare their performance through conventional AC load flow technique, DC load flow technique and PSCAD comparison simulation.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"43 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.5207/jieie.2023.37.5.076
Won-Il Lee, Seung-Beom Lim, Ji-Su Kim
This paper introduces a UPS(Uninterruptible Power Supply) system that has an Energy Storage System(ESS) and can provide both LVDC(Low Voltage Direct Current) and AC outputs simultaneously. This system integrates an offline UPS, which is composed of bidirectional inverters and a battery converter, with an LVDC system consisting of a DC-DC converter. The LVDC system is designed to produce LVDC output by sharing the UPS’s DC LINK, thus The LVDC system offers the advantage of compensating for power outages. Moreover, the proposed system has an ESS function that can distribute peak load through load leveling. The performance and functionality of the proposed system were validated through experiments in various scenarios, including normal operation, power outage situations, charging, and discharging.
{"title":"Development of LVDC/AC UPS Intergrated Power Conversion System with ESS Function","authors":"Won-Il Lee, Seung-Beom Lim, Ji-Su Kim","doi":"10.5207/jieie.2023.37.5.076","DOIUrl":"https://doi.org/10.5207/jieie.2023.37.5.076","url":null,"abstract":"This paper introduces a UPS(Uninterruptible Power Supply) system that has an Energy Storage System(ESS) and can provide both LVDC(Low Voltage Direct Current) and AC outputs simultaneously. This system integrates an offline UPS, which is composed of bidirectional inverters and a battery converter, with an LVDC system consisting of a DC-DC converter. The LVDC system is designed to produce LVDC output by sharing the UPS’s DC LINK, thus The LVDC system offers the advantage of compensating for power outages. Moreover, the proposed system has an ESS function that can distribute peak load through load leveling. The performance and functionality of the proposed system were validated through experiments in various scenarios, including normal operation, power outage situations, charging, and discharging.","PeriodicalId":488820,"journal":{"name":"Journal of The Korean Institute of Illuminating and Electrical Installation Engineers","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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