티스토리 뷰
Single Phase inverter is a power electronic device to make from DC Voltage to AC Voltage. This Inverter is used general for AC Motor contained devices or electric grid. We already learned how we can control the output Voltage on Buck Converter. The Single Phase Inverter controlled by PWM (Pulse Width Modulation). In my simulation, I made a single phase full-bridge inverter with variable control system
- Case 1 (T1 are on)
- Case 2 (T2 are on)
On the other case, the current flows from DC voltage through the T2 connected IGBT to the load and capacitor. The current I_L decreased equals the exponential function and the load get opposite polarity as DC voltage.
We can make the sinus wave voltage and current with combining the cases.
- Single Phase Inverter with Open Loop
This control system is very simple. The IGBT receives a signal from the control panel. The control panel contains reference sine wave signals and zigzag signals. If the sine signal is greater than the zigzag, the output signal is 1 and in other cases 0. This signal flows to the gate of the IGBT.
- Single Phase Inverter with Closed Loop
we can take feedback from load by using sensor and compare with reference sinus wave voltage. So that, we can make PWM signal. In this case, I used just PI control. In this simulation, I aimed 200 V for pick voltage.
- Single Phase grid connected Inverter with Closed Loop
In this case, we need to phase shift to supply electric energies to the electric grid. For supply electric energies, we need to make reactive power, because if we have high active power on electric grid, we have high electric energy loss caused by cable resistance. So we can make phase shift from PPL (Phase Locked Loop), which connected two low pass filters with omega = omega_c
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