Reference signal generation using pq theory

The simulation circuit generates reference signal (fundamental ) using instantaneous pq theory

The nonlinear load is connected to three phase supply and voltage & current are measured. The reference signal is generated by converting abc to alpha beta and to pq. dc component of pq is obtained by taking mean value and then converted to pqto alpha beta and then abc signal. The abc signal is the reference signal(Fundamental) for DVR, DSTATCOM and Filters. If the reference signal is the compensator signal then abc signal is subtracted by the actual abc signal