Voltage dips on matlab

Hello guys,

I want to have a voltage dips simulation on matlab (code and simulink if possible), so a voltage dip is the diminution of the supply voltage in a specific time, that means I want to have an amplitude signal of 220 V, then in a given period goes down to 70% of 220 V which means 154 V, then goes up again... etc

Thank you for your answer.

[Jon]

So you just want a square wave with a fixed period that switches between 220V and 154V?

Answer 1

[Walter Roberson]

square() is -1 to +1. you multiply by 0.7 and add 0.3 so you get a range of -0.4 to +1. You multiply your signal by that, but the parts that are negative reflect your signal with a sharp kink.

If you multiplied by 0.3 and added 0.7 then the range would be 0.4 to +1

[Walter Roberson]

Don't use square(). Use

1 - 0.3*(START1<=t&t<=STOP1 | START2<=t&t<=STOP2)

and so on.

But it depends what should happen if you have two overlapping pulses. The above code would merge the ranges, only one dip. There are other very reasonable situations in which you would want to either sum the drops (30%+30% => 0.4) or multiply (.7*.7 => 0.49)

[Walter Roberson]

The square() function goes negative. You need to adjust the range

0.85 + square(Frequency)*0.15