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"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS  DO MAL"

“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

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quarta-feira, 19 de agosto de 2020

공동주택에 적용한 계통연계형 태양광발전시스템의 보호방식에 관한 연구 A Study on the Protection Method of the Grid-Connected Photovoltaic Power Generation System Applied to Apartments-GeunYub Lee- Dept. of Electrical Eng. The Graduate School Korea University

 










공동주택에 적용한 계통연계형 태양광발전시스템의 보호방식에 관한 연구
 A Study on the Protection Method of the Grid-Connected Photovoltaic Power Generation System Applied to Apartments
 高麗大學敎工學大學院 電氣工學科 李根燁 2011年 
 A Study on the Protection Method of the Grid-Connected Photovoltaic Power Generation System Applied to Apartments 
BY GeunYub Lee 
Dept. of Electrical Eng. The Graduate School Korea University 
(Supervised by Prof. Gilsoo Jang, Ph.D)
 Abstract 
Global environment problems have emerged rapidly throughout international society since the 1990s. Diverse global environment problems are being raised including global warming, ozone depletion, waste contamination, acid rain, desertification, marine pollution, extinction of species, and radioactive contamination. The root cause of these phenomena is energy consumption. Moreover, around a fourth of the total energy consumption is consumed by buildings. In Korea, buildings consume around 25% of the total energy consumption, and residential buildings consume around 75% of energy consumed by buildings and energy consumption by residential buildings is expected to keep growing along with the rise of economic level. Taking this issue seriously, the Korean government has been supporting investments in research and facilities for energy saving and alternative energy technologies since the 1980s as an effort to secure future energy sources, to solve global environment problems, and to attain sustainable economic growth. Recently, facilities using new and renewable energies are being spread and expanded and people are recognizing particularly the importance of technologies for photovoltaic power generation as an infinite energy source. Considering the current situation of Korea highly dependent on fossil energy, the application of photovoltaic power generation to apartment buildings is desirable not only for the growth of national economy and the stable security of alternative energy resources but also for the conservation of global environment. Nevertheless, there have not been many studies for developing technologies to connect photovoltaic systems to electric companies. It is urgently required to increase stable electric power supply of enhanced reliability and to develop system connection technologies. The installation of photovoltaic systems is steadily increasing as evidenced by the onemillion green home construction project under the government’s active support. If photovoltaic facilities are installed on the slanting roofs of apartment buildings and connected to existing distribution systems, they may have an adverse effect on quality, stability and reliability of electric power and, most of all, may disrupt the protective coordination of systems. The connection of photovoltaic systems to distribution systems means a new change in the conventional concept of electric power system. Thus, this study aimed to analyze the quality of electric power required and expected problems when photovoltaic facilities are connected to distribution systems, to look for solutions for the problems, and ultimately to enhance the performance, stability and reliability of photovoltaic systems and establish technological conditions to be satisfied for connection to distribution systems. First, this study examined how to prevent islanding detection caused by power failure in existing distribution systems during the connected operation of photovoltaic facilities and existing distribution systems and to minimize the loss of human life and properties caused by such accidents. Second, this study analyzed the capacity of photovoltaic facilities connectable to low‐voltage distribution systems based on voltage regulation as a part of research on the capacity of photovoltaic systems connected to existing distribution systems. Third, with regard to the ground system of photovoltaic facilities, this study demonstrated the need of a new evaluation method suitable for DC systems apart from existing AC ones. There will be unexpected problems raised along with the spread of system‐connected photovoltaic facilities. Thus we expect active research to find solutions for problems resulting from connection between photovoltaic facilities and distribution systems and to hasten the stable supply of electric power to consumers through photovoltaic facilities using solar energy.

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