The 3-Phase Inverter with PWM generation built using Matlab-Simulink, the output current is not same in all 3 Phases

Hello Community,

I generally work on 3D simulation tools associated with domains such as Powertrain NVH studies and I am new to Matlab-Simulink tools.

Now I am exploring the electrical/electronics domain (beginner) to get some initial data that will be required for further NVH studies.

I have made a 3-Phase Inverter with Pulse Width Modulation (PWM) circuit with help of tutorials online.

Currently I am facing this issue, where the output current extracted from the 3 Phase Inverter is not having the same magnitude(values) in

3 phases, How to correct the Matlab-simulink model regarding this issue?

Inputs given to the model,

DC Voltage source - 400 V

and Reference Sine wave blocks - Frequency 50Hz and Phase difference of 120 for 3 phases (Amplitude 1)

and carrier wave (Sawtooth generator) - Frequency 10,000 Hz (Amplitude 1)

The Load - 3-Phase Parallel RLC Branch - Only Resistor type is used with 1 Ohm resistance

Note: Regarding the grounding, two approaches I have tried - Grounding the load (RLC) and grounding the Inverter 6-switches loop (both have same results)

Thank you in advance for all the support and help

Answer 1

[Sabin]

Problem appears to be the way magnitude is calculated. Most likely the average values vary between 0 and some values. It would be more helpful to check the ABC currents.