shift sine wave by 90 degree

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

[madhan ravi]

matlab or simulink?

[Saif Zahran]

simulink

Answer 1

[Star Strider]

Take the derivative of it.

Answer 2

[Image Analyst]

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;

[Saif Zahran]

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]

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.