Principle and difference of high power UPS 6-pulse and 12-pulse thyristor rectifiers

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Principle and difference of high power UPS 6-pulse and 12-pulse thyristor rectifiers

This paper elaborates the principle and difference of 6-pulse and 12-pulse rectifiers from four aspects: theoretical derivation, measured data analysis, harmonic analysis, improvement countermeasures and performance comparison. An in-depth analysis of the rectification technology of high power UPS.

Theoretical derivation

1,6 pulse rectifier principle:

6 Pulse refers to the full-bridge rectification consisting of 6 thyristors (thyristors). Because there are 6 switching pulses to control the 6 thyristors, it is called 6-pulse rectification.

When ignoring the commutation process and current pulsation of the three-phase bridge thyristor rectifier circuit, assuming that the AC side reactance is zero, the DC inductance is infinite, and the delay firing angle a is zero, the AC side current Fourier series is expanded to:

From the formula (1-1), the following conclusions can be drawn:

The current contains 6K?1 (k is a positive integer) subharmonic, that is, 5, 7, 11, 13... and other harmonics, the effective value of each harmonic is inversely proportional to the harmonic order, and The ratio of the effective value of the wave is the reciprocal of the harmonic order.

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