Abstract:

With the rapid expansion of the photovoltaic energy storage industry, energy storage systems are developing toward high voltage, large capacity and high current. Traditional disconnectors cannot adapt to the high-voltage and high-current operating conditions of energy storage systems, and are plagued by insufficient making-breaking performance and poor short-time withstand capacity. A high-voltage DC high-current disconnector is proposed. Systematic optimization design is conducted from four dimensions: overall product structure, making-breaking characteristics, short-time withstand performance and operating mechanism design. Performance verification is realized through simulation calculation and physical tests. Test results show that the developed disconnector can adapt to the harsh high-voltage and high-current working conditions of energy storage systems and possesses outstanding comprehensive performance. The proposed product design scheme can provide design ideas and technical references for developing large-capacity disconnectors applied to photovoltaic energy storage systems.

Key words: high-voltage, high current, disconnector, making and breaking performance, short-time withstand, photovoltaic energy storage system