Grid-Tie inverter Frequency Detection

Discussion in 'General Electronics Chat' started by Chacabucogod, Mar 3, 2015.

  1. Chacabucogod

    Thread Starter New Member

    Nov 16, 2013

    My question is the following: In order to detect the frequency and phase of mains voltage, I would usually use a trasnformer to lower the voltage and then use an opamp to create a square wave with the frequency and phase of mains voltage. Nonetheless, I've read it's not that easy. For example, the wikipedia page on islanding explains severals ways of detecting the change of frequency, there's even a pdf from sandia labs explaining it. Several other pages I've read talk about a phase locked loop control system. Is it really that hard to measure the phase and the frequency of a mains voltage while having a grid tie inverter connected to it?

    Thank you