A Chirp Z transform based synchronizer for power system measurements

Power system analyzers are required for performing an accurate evaluation of harmonic pollution, voltage and current synchronous sampling in order to limit leakage error and to assure reproducible results. Moreover, the increased interest about power and voltage quality, forced international working groups to define new standards for testing and measurement techniques. In particular, harmonic and interharmonic measurement and instrumentation standards require the correct voltage or current signal synchronization and the recognition of the same condition. In this paper a new synchronizer algorithm is proposed, able to respect in force and draft standards for its accuracy and characteristics. Theoretical aspects are discussed and different experimental tests are reported, comparing the proposed method with a similar well-known one based on interpolated fast Fourier transform.