is there a tool to calculate and plot voltage stability curves

i'm looking to matlab code or toolbox that calculate and plot voltage stability for simulink model like IEEE 9 bus system

please if you can help me, any advice will be highly apperciated

thanks in advance

[Peerapon]

I'm looking for the same solution, have you figured it out?

Thank you

Answer 1

[Sam Chak]

Hi @Rashed HD, @Peerapon

Could you describe the stability properties of the electrical system that you are seeking?

Conventionally, credible proofs of dynamical system stability are demonstrated (and accepted) through rigorous mathematical analysis. If mathematical analyses are tremendously difficult or impossible to obtain analytically, then the Monte Carlo method can be employed. In this method, the behavior of a system is simulated many times over using random inputs, and the outcomes are then analyzed to estimate probabilities and make predictions. However, graphical-based stability proofs also have limitations.

In certain special cases, if your system can be represented by the Dynamic System Models listed, you may utilize the MATLAB tool 'isstable()' to determine the stability of the dynamic system model. Despite the utility of such a tool, the results it yields cannot be officially admitted in audited technical reports or peer-reviewed science journals. In other words, we cannot assert the stability of the system solely based on the output of the MATLAB tool.

[Peerapon]

Hi @Sam Chak,

Thank you for your reply, currently I'm studying about the power system stability.

Refer to my course, I have a IEEE 9 Bus system, and I have to run P-V curve/P-Q Curve on each bus to see the voltage stability at steady stage and dynamic stage.

So I'd like to know how to plot the PV/PQ Curve graph to illustrate the limit of the system

[Sam Chak]

Plotting curves requires data points. If you want to plot the P-V curve and the P-Q curve, the first step is to collect data points for P, V, and Q from your IEEE 9 Bus system. Save the data in a .mat file and then attach it here by clicking the paperclip icon.