Extraction of signals for harmonics, reactive current and network-unbalance compensation

A nonlinear signal processing system for the simultaneous extraction of harmonic, reactive current and instantaneous symmetrical components is presented. The building block of the proposed system is an enhanced phase-locked which provides accurate and synchronised extraction of the desired signals. The behaviour of the system is demonstrated by means of simulation case studies. The algorithm adopted for the system is frequency-adaptive, immune to noise, and robust with respect to external disturbances and setting of the internal parameters. The proposed system can be used as the reference generator of FACTS and custom power controllers, e.g. an active power filter. Structural simplicity and robustness furnish the proposed system with ease of implementation and tuning on hardware/software platforms.