Research on Harmonics Caused by UPS
KE Jian-xing · Telecom Power Technologies · 2003
A new type series active filter based on fundamental flux compensation was used in uninterruptible power supply, according to the transformer's equivalent circuit, if a fundamental current in proportion to the fundamental current of the power systems is injected to the transformer's secondary winding, the primary winding means a very low impedance to fundamental, while means a high impedance to harmonic. The correctness of the theory is proved by the excellent experiment results.