Synchronization system with Zero-Crossing Peak Detection algorithm for power system applications

This paper presents a new synchronization system that can be used to extract real time information such as the amplitude, phase and frequency of the fundamental component from an input power signal. The synchronization system is based on a zero-crossing (ZC) and peak-detection (PD) algorithm. Among its advantages, the Zero-Crossing Peak Detection (ZCPD) system performs well in the presence of input signal distortion with THD values as high as 50%, tracks positive and negative frequency ramps as high as 250Hz/sec and has a transient recovery time of two to four fundamental cycles. The ZCPD system is able to recover and re-synchronize from transient disturbances such as amplitude sags and swells (0.2pu - 1.8pu), positive and negative phase steps (±60
^°
) and signal interruptions spanning from a few cycles to several seconds. This article details the key design features of the synchronization system and experimental results that bring into focus the performance of the ZCPD system.