Simulink space vector PWM simulation

• The model:

• Here is what i intend to do.

1. Generate three phase voltage
2. Do a alpha beta transformation
3. Do a Cartesian to Polar transformation
4. Check the angle output
5. Since the three phase vector rotates counter-clock wise, I am supposed to get sequence of angle moving from zero to 180 degrees and drops to -180（in no time!） and moves up and repeats itself.But result is that the angle sometimes reaches 172 degrees and turns around,not reaching 180 degrees.Waht is wrong? help!

• Here is the result

Answer 1

[MUHAMMED FASIL]

Please resubmit ur valid mdl file or send me at [e-mail]

[chen dunzhi]

Thank you. The problem is solved.

The time step for simulation is not small enough, leading to insufficient accuracy.

And I changed the time step from 0.01 to 0.00002 and the result is just as expected.

Thank you again!

Answer 2

[MUHAMMED FASIL]

Try with abc-AlphaBeta simulink block. Or submit ur mdl file

[chen dunzhi]

The mdl file is there named reference_generation.mdl And i checked with abc-AlphaBeta block the result is the same. Does it have anything to do with the solver that Simulink uses? Because there is a warning: