The method of Simulink PI produces phase-locked loop

Pi method is a proportional integral method, and the reference http://www.elecfans.com/dianzichangshi/20120909287851.html for Pi method is introduced.

Phase-Locked Loop Pi method principle reference http://wenku.baidu.com/view/86b9586fa76e58fafab003b7.html

The method of determining the coefficients reference http://wenku.baidu.com/view/029d23425a8102d277a22f69.html

This design encountered a bit of trouble, the reason is that from a double to fixed-point data conversion process did not take into account the original data caused by the location of the impact, if the point after the whole number of bits, then in fact, there will be overflow, how the simulation will not be right, careless.

The method of Simulink PI produces phase-locked loop