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 |
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