how to get Beta in power transformation ?

I need help

per the diagram, i am designing DQ frame controller for single phase grid connected to H-bridge inverter and LCL filter.

Current Decoupled to alpha which is sine wave, and beta which need to be shiftted by 90 degree.

in above diagram i am using transport delay to shift beta, but this way does not give accurate result.

I need help of any other way to be implemented to get beta with same freauency and amplitude of alpha

Thanks

[JANARDHAN GURRAM]

Dear Saif Zahran

I am working in the same environment of producing alpha beta to dq for a single phase inverter . I too started with transportation delay but getting ac outputs in d, q profiles when i watch them .I guess they are needed to be dc components .

Have solved your issue.?

Do you find the solution for the same .

Can u please help me in any way .

Answer 1

[Sabin]

In continuous time, to achieve a 90-degree phase shift, you can use a Transport Delay block (or a Variable Transport Delay). The key is to set the delay time to a quarter of the signal's period. You can use a PLL to get the frequency:

https://mathworks.com/help/sps/ref/sinusoidalmeasurementpll.html

Other approaches include but not limited to FIR filter or use complex exponentials.