Research of Novel Measuring Method in Photovoltaic Grid-Connected Regulation and Control System

A high-performance regulation and control method was designed for photovoltaic grid-connected system. To meet the basic requirement, a new special frequency and phase measurement by using two-way square wave cycle and the improvement in Amplitude-Limiter-Filter algorithm to reach the target accuracy were utilized. The related experiment results showed that the system in which this method was adopted work stably.