A Novel Real-Time Detection Method of Active and Reactive Currents for Single-Phase Active Power Filters

This paper proposes the simplest real-time detection method of the fundamental active and reactive currents in single-phase circuits. The proposed method uses only four multipliers and two LPFs for detecting the fundamental active and reactive currents with a PLL circuit. The basic principle of the proposed detection method is discussed in detail, and the proposed method is applied to a previously proposed single-phase shunt active filter for consumer electronic equipment. Digital computer simulation is used to confirm the validity of the proposed detection method. A reduce-scale experimental model is constructed and tested. Experimental results demonstrate the excellent practicability of the proposed detection method.