Speeding-Up of Dynamic States for Single-Phase Power Active Filter

The paper deals with the new method of analysis of single-phase power electronic systems. Using a new particular transform theory the ordinary single-phase system can be transformed into equivalent two-axes orthogonal one. The new original thought is based on the idea that ordinary single-phase quantity can be complemented by fictitious second phase so that both of them will create orthogonal and ortho-normal system, as is usual in three-phase systems. Application of above theory makes it possible to use complex methods of analysis as instantaneous reactive power method, which have not been usable for single-phase systems so far. Both, the active and reactive powers can be determined by this way. Practical application of the method is outlined for the case of reference current determination for single-phase power active filter. Three different ways of reference current determination are discussed results. The paper shows some examples of the experimental verification results, which proved an extremely fast response of the single-phase active filter with control algorithm, based on the described method