Single-phase pq theory for active filters

The single-phase pq theory is used for instantaneous reactive power and current harmonics compensation of single-phase loads. A new definition of single-phase instantaneous active power p(t), and reactive power q(t), is used in control circuits. Generation of reference compensating current of single-phase active filter is based on canceling the alternating component of p(t) for harmonic compensation and q(t) for reactive power compensation. The principle of operation is explained using analytical and simulation results.