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Grid Tie Inverter

The 300W Grid tie inverter for home application:
1. Schematics and simulation
This project use an old UPS transformer for grid connect (For step-up and isolate voltage between Grid and Batterry). Main diagram PWM control use TL494 and LM324 for full-wave precision rectifier. An old radio transformer 220/12V for voltage measurement and synchronization.
Below is the schematics and some project GTI Image
Fig 1: GTI simulate by psim 9.01
Note 1:  Change DC voltage source will change the power injection into grid
Note 2:  Change the phase of synchronous voltage will change the reactive power (Look like STACOM) from negative or positive angle
Note 3:  If modulation index is low, the DC link voltage will increase too high and dangerous to FET switch
2. Implementation use TL494, LM32, PIC16f628a for frequency and synchronous protection