An intelligent high-power "green" UPS

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An intelligent high-power "green" UPS [Copy link]

At present, the rectifier of medium and large power UPS generally adopts phase-controlled rectifier circuit. The phase-controlled rectifier circuit has a simple structure and mature control technology, but the AC input power factor is low and a large amount of harmonic current is injected into the power grid, which does not meet the requirements of "green electricity use". In order to overcome the above shortcomings, Xuji Power Supply Company, based on the introduction of Toshiba's UPS technology, adopted high-frequency PWM rectifier circuit to develop a high-power UPS with 30kVA~100kVA three-phase output and 30kVA~50kVA single-phase output. This UPS is an online intelligent UPS. In addition to having perfect output characteristics, it also has the advantages of AC input current close to the ideal sine wave, less harmonic current injected into the power grid, and input power factor close to 1. It fully meets the requirements of "green electricity use" and is a UPS with great development prospects. The following introduces its system structure, working principle and characteristics.