CCS/TMS320F28335: TMS320F28335

Prithvi,

The program seems to apply a standard PI controller from controlSUITE which was used in our motor control examples at that time. It should work fine. What issue are you seeing?

Regards,

Richard

Hi Richard,

The issue is that, when i multiply my control loop output with the CMPA value to get the controlled PWM for my inverter it is working only after the reference value and the feedback value is also not reading till the reference value and hence i am not getting the controlled PWM for my inverter .

Please help me with this .

Thank you.

Warm regards,

Prithvi

Part Number: TMS320F28335

Tool/software: Code Composer Studio

Hi, 

This is Prithvi , I am attaching a file where i am trying to implement a PI control , but my control loop is not working . Not working in the sense I am not getting a Controlled PWM for inverter , for simulation purpose i have used inbuilt potentiometer as a feedback voltage and i have set reference voltage as 1.5 .

And Can you please tell me how to convert the IQ values to float or integer ?

Kindly help me .

Thank you.

Warm regards,3250.Controller.zip

Prithvi 

Prithvi,

The issue is you are mixing data types. The PI controller ises IQ data throughout, yet you are giving it a float and the output is being assigned to a float variable (output1). You need to take care to ensure the data types are consistent.

Change "voltage5" and "output1" so they are _iq (you do not seem to use output1), then typcast the variables appropriately. Please consult the IQmath quickstart guide in C2000Ware for details. I think the following is correct, but please check.

Voltage5 = (_iq) (AdcRegs.ADCRESULT4)*_IQ(3.0/65520);//pin A0

EPwm1Regs.CMPA.half.CMPA = EPwm1Regs.TBPRD * (int) pi1.Out;

Step through your program while monitoring values in the expressions window in CCS to be sure you are getting the results you expect.

Also, please do not post duplicate questions to the forum. Your post is tracked so it will not be lost. I will go ahead and close your other post on this matter. Thank you.

Regards,

Richard