how to compare a measured voltage signal with a reference signal which is a function of time in simulink?

i am working on designing a grid connected solar PV system. the problem is that i have to compare the measured grid voltage with a LVRT curve shown in picture. this comparison should start only when the measured grid voltage is below a certain threshold value. in other words, the task can be sumarised as:- measure grid voltage if grid voltage is found to be less than a certain value, then start comparing it with the LVRT curve. if it is below LVRT curve at any point in time, then trip the system. i have tried to program it using timer function, but it does not support code generation. can somebody suggest a simple solution or where i should look for solution?

Answer 1

[Sabin]

A good starting point is this example from Simscape Electrical:

https://mathworks.com/help/sps/ug/three-phase-grid-connected-in-pv-system.html

This example shows how to model a three-phase grid-connected solar photovoltaic (PV) system. This example supports design decisions about the number of panels and the connection topology required to deliver the target power. The model represents a grid-connected rooftop solar PV system without an intermediate DC-DC converter. To parameterize the model, the example uses data from a solar panel manufacturer datasheet. Solar power is injected into the grid with unity power factor (UPF).