how to get Beta in power transformation ?

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Saif Zahran
Saif Zahran 2019-3-3
回答： Sabin 2025-1-13
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
  1 个评论
JANARDHAN GURRAM
JANARDHAN GURRAM 2019-12-20
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 .

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回答（1 个）

Sabin
Sabin 2025-1-13
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.

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