Transformless conditioners of quality of main voltage

Offered a new class of conditioners of electrical energy quality on the base of novel buck-boost AC-AC voltage converters. In one-phase case they are similar to appropriate DC-DC converters with allowance for replacements of one-quadrant keys on four-quadrant. In the three-phase schemes without a neutral the number of keys can essentially be reduced (in a limit up to two) as contrasted to by composition of the scheme from three single-phase. The unified direct method of calculation of such converters are developed. The outcomes of simulation of a sample of the conditioner by power 5,5 KVA are adduced.