Making an IGBT rectifier (single phase) with Simscape components
Latest activity Reply by Naga Babu Koganti
on 26 Sep 2024
I was given a homework to make a Simscape IGBT rectifier, in which changing the delay angle leads to the conventional output. The input is 220 V 50 Hz supply, there are 2 gate pulses which I am providing using pulse generators (period 1/50 and pulse width 50%). The output, however is not correct. I am attaching the circuit diagram
and the incorrect output for a delay angle (α) 60 degrees. Can somebody point out the mistake? Thank you.
1 Comment
Time Descending
The issue you're encountering in your Simscape IGBT rectifier simulation, where changing the delay angle to 60 degrees leads to incorrect output, could be due to the following reasons:
- Incorrect Gate Pulsing Timing:
- You mentioned you are using pulse generators with a period of 1/50 seconds and a 50% duty cycle. This means the pulses are generated at a 50 Hz frequency, but for phase-controlled rectification, the delay angle controls the firing of the gate pulses relative to the AC input. Ensure that the delay angle (60 degrees in your case) is correctly implemented in terms of the timing of the gate pulses. In a 50 Hz system, each cycle takes 20 ms, so a 60-degree delay corresponds to a delay of 60360×20=3.33 ms\frac{60}{360} \times 20 = 3.33 \text{ ms}36060×20=3.33 ms.
- Synchronization of the Gate Pulses with the AC Input:
- The pulses for the IGBT gates need to be synchronized with the zero-crossing points of the AC voltage waveform. If the pulse generators are not properly synchronized with the input voltage, the gate firing will occur at incorrect times, leading to an unexpected output.
- Input Waveform and Rectification:
- Check if the input waveform is correctly represented in your model and that the delay angle is correctly implemented to control when the IGBT turns on relative to the input voltage. Any mismatch in this implementation could cause improper rectification.
- Rectifier Configuration:
- Review the rectifier circuit itself. Ensure the IGBTs are connected properly to allow for rectification. Any incorrect connection of the switches can lead to improper conduction and thus faulty output.
Sign in to participate
