Comparison of four solutions for suppressing input harmonic current in high-power UPS

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Comparison of four solutions for suppressing input harmonic current in high-power UPS [Copy link]

For high-power UPS, if the UPS rectifier is a three-phase full-controlled bridge 6-pulse rectifier, the harmonics generated by the rectifier account for
nearly 25-33% of all harmonics, which is very harmful to the power grid. Harmonics can cause heating of distribution cables and transformers, reduce call
quality, malfunction of air switches, generator surge and other adverse consequences; harmonics are divided into + sequence (3k+1 times, k is
0 and a positive integer), - sequence (3k+2 times, k is 0 and a positive integer), and 0 sequence (3k times, k is a positive integer) according to the current phase sequence. The + sequence current increases the loss
, the - sequence current causes the motor to reverse and heat up, and the 0 sequence current causes the neutral line current to increase abnormally.