PQ theory can't work in single phase

on PQ theory, but I'm facing an issue. When the PQ block is connected to the system, the calculation results in algebraic loops, and the system doesn’t work. However, when the PQ block is not connected, everything seems to function properly. Could someone help me figure out what’s going wrong? Thank you!

[Mathieu NOE]

hello

maybe you have an algebraic loop problem , but IMHO you have first to solve your division by zero problem.

Answer 1

[Divyajyoti Nayak]

Hi @Thanapon,

The reason the model is not able to run is because there’s a division by zero happening in the first time step. Since the voltage starts at 0, “vs_alpha” is 0 and as “vs_beta” is the delayed “vs_alpha” signal, it is also 0. That’s why the division by zero error is occurring. Simply having the voltage start at a non-zero value by adding a phase shift to the voltage source should solve the issue.

The phase of the voltage source can be changed in the block parameters of the “Voltage Source” block.