Matlab-based Voltage Stability Analysis toolbox and its validity check

A novel Voltage Stability Toolbox(VST) is introduced, which is programmed using Matlab math language, and the features of its open source code and a complete set of user-friendly graphical interfaces are detailed. It implements standard Newton-Raphson (NR) and Newton-Raphson-Seydel (NRS) convergent algorithms to analyze the voltage stability and bifurcation of power system. The main functions of VST include power flow, time domain simulation, singularity analysis, eigenvalue analysis, as well as static and dynamic bifurcation analysis. VST is a very helpful tool to understand voltage stability and nonlinear bifurcation phenomenon. Test results of the application of this toolbox in a five-bus system with three generators and IEEE 30-bus test system are presented to show the practicality and effectiveness of the VST.