grid tied inverter solar pv system In Proteus Simulator

I am doing synchronization a grid-tied solar inverter is building a circuit, but in c programming, something is wrong.

I want to check the synchronized voltage and frequency. PV input with grid reference by SPWM using pic18f4520.

please if you can amend my circuit and C code to run the output in LCD display synchronized or not? am trying my self not correct just modified this one to generate output

The idea compare two signal between two input and reference grid 220V and 50HZ, Please use xc8 compiler and pic18F4520, Also don’t forget LCD programming not written if want sample programming for 7 segments I can give you no problem