Parameter Design of Software Phase-Locked Loop Based on Z-domain

Abstract

Exact phase information is essential for the smooth operation of most modern power conversion devices. Software phase locked loop (SPLL) has favorable condition for free design and high adaptability to gain phase and frequency information of power voltage quickly and accurately. In this thesis, we analyze SPLL principle, obtain the z-domain SPLL linearization model, then analyze the stability and error of the SPLL linearized model, and design parameters o the SPLL controller under the z-domain, and finally, simulate and verify for two power voltage phase jump cases. The simulation results show the correctness of the design method.