A wide range frequency adaptive synchronization system for monitoring and control of power systems

Abstract

A three phase synchronization system suitable for control and monitoring of power systems applications is presented. The Positive Sequence Filter Synchronization System (PSF-SS) is frequency adaptive and provides real time frequency, amplitude and phase estimates of the extracted positive sequence component. The PSF-SS is capable of operating over a wide range of frequencies (40-800Hz), and in the presence of significant input signal distortion (THD≤100%). The PSF-SS is capable of achieving parameter estimations within 0.5% of the nominal value for worst case scenarios. The system employs adaptive filtering techniques that offer a high degree of immunity to harmonics, inter-harmonics and notch-types disturbances over the full range of operation. In the event of input transients such as balanced/unbalanced amplitude sags and swells, balanced/unbalanced phase steps and positive/negative frequency ramps (≤250Hz/sec), the system achieves a worst case transient response time of 2 cycles of the input period. The PSF-SS is implemented as a proof of concept on a field programmable gate array. The proposed system has the highest frequency ramp tracking capability of any positive sequence synchronization system developed to date.Index Terms -dynamic frequency range, fast transient recovery, grid monitoring and control, positive sequence tracking, synchronization system.