# Finding the peak of a sinusoidal voltage using only Simulink Blocks (No Matlab Function Block)

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HASSAN ABDELGABIR 2024년 2월 23일
댓글: HASSAN ABDELGABIR 2024년 2월 26일
Hi there!
I have a simulink model where I am measuring the line voltages. I need to find the peak of the line voltages over the first 10 cycles for example. So I will have a varaible named "peak_voltage" which should have a value of 0 when the simulation time did not reach 10 cycles, and a value of the peak line voltage afterwards.
I have achieved this using piece of code within a "Matlab Function Block" where I use a persistent variable that gets updated each cycle with the value of the current line voltage when it is on the positive slop of the line signal. But I need to achieve this by only using Simulink Blocks! Any ideas would be appreciated. Thanks

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### 답변 (1개)

Sam Chak 2024년 2월 24일
Isn't the MATLAB Function block part of the Simulink block families that grants you the greater potential to achieve what you want in a more convenient way? It is also possible to create a Custom Simulink block to strictly execute the tasks that you specify. You can refer to the following tutorial for detailed instructions:
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Sam Chak 2024년 2월 26일
No worries, @HASSAN ABDELGABIR. However, what specifically hinders you from enhancing your efficiency by utilizing the MATLAB Function and Custom Blocks? Have you experimented with the Max block?
HASSAN ABDELGABIR 2024년 2월 26일
Yes I was able to achieve it using Max block and if block in Simulink. The key was to use the Data Store Memory block to replicate the behavior of persistent variables.
Thank you

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