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shift sine wave by 90 degree

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Saif Zahran
Saif Zahran 2019-2-23
评论： Image Analyst 2019-2-23
hello,
I have sine wave supply and i want to get alpha and beta, alpha is the orginal sine wave but beta should be shifted by 90 degree.
how can i shift the sine wave by 90 degree ?
thanks

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回答（2 个）

Star Strider
Star Strider 2019-2-23
Take the derivative of it.
Image Analyst
Image Analyst 2019-2-23
So you have x and y values for your "alpha" curve and you want a "beta" curve that looks like your alpha curve but is shifted 90 degrees, or pi/2, to theright or left? So, do you mean like this
betax = alphax - pi/2;
betay = alphay;
plot(betax, betay, 'b-');
grid on;
  2 个评论
Saif Zahran
Saif Zahran 2019-2-23
alpha and beta to control the current and they are coming from lcl filter connected to grid system. then those signals will be feeden to park transformation to get DC values for active and reactive power.
i am not able to get the appropriate result
thanks
Image Analyst
Image Analyst 2019-2-23
Sorry -- I don't use Simulink. I've added it to the product list at the right. Next time you can add it yourself when you first make the post.

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