THE USE OF RESTTABLE FUSES “POLYSWITCH” TO PREVENT CURRENT OVER-LOADS IN PHOTOVOLTAIC SYSTEMS

• Дата: 2020
• Автори: Tonkoshkur, A., Nakashidze, L.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2020
• Теми: photoelectric converter; overcurrent; resettable fuses; current-voltage characteristics; power-voltage characteristics; simulation.; фотоэлектрический преобразователь; токовые перегрузки; самовосстанавливающиеся предохранители; вольт-амперные характеристики; вольт-ваттные характеристики; моделирование.
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/253
• Назва журналу: Vidnovluvana energetika

Relevance. Currently available simulation results and experimental data indicate that bypass diodes in the subpanel rows of photovoltaic cells do not fully protect against the appearance of “hot spots”. Bypass diodes are more effective for preventing “hot spots” with very short PV-cell line lengths, which is not used in modern panel designs for economic reasons. Therefore, it is necessary to increase the reliability of solar cells, including the elimination of emergency (fire hazardous) situations based on the development of methods and means to prevent current overloads in their photovoltaic systems based on new approaches. Purpose. Development of a universal approach to minimize current overloads in photovoltaic systems of solar cells by using low-cost elements of functional electronics, in particular, relatively new and widely used self-healing fuses of the Polyswith type. Method. A circuit solution is proposed and the modeling method substantiates the possibility of using Polyswitch type fuses to prevent and minimize current overloads in solar PV systems. Results. The influence of the resistance value in the conducting state and the fuse trip current on the current-voltage and power-voltage characteristics of parallel connections of photoelectric converters and their modules is analyzed. A mathematical model of the circuit solution is developed and its basic characteristics are simulated using typical parameters of monocrystalline silicon photoelectric converters and commercial self-healing fuses. The influence of the resistance value in the conducting state and the trip current of the RFu on the current-voltage and power-voltage characteristics of the parallel connection of the photovoltaic components of solar cells is analyzed. Conclusion. It is shown that effective current limiting in the presence of a short circuit with such a connection of photovoltaic components can be implemented when the following conditions are met: - the resistance of the fuse in the conducting state is much less than the parallel connection of the series resistances of the photoelectric components; - the trigger current of the fuse must be greater than the short circuit current of the individual photovoltaic component and less than the current of their parallel connection. Ref. 26, fig. 5, tabl. 1.