Graphical user interface of analyzing subsynchronous oscillations in power system with HVDC link

A Graphical user interface (GUI) software was developed to analyze subsynchronous oscillation (SSO) characteristics in the power system with the HVDC link, in order to improve the research efficiency and popularize the research results. The GUI software is made up of the man-machine interfaces and the related callback functions. MATLAB-based GUI tools are used to design the man-machine interfaces. And the callback functions are coded by taking the advantage of the numerical calculation and data visualization functions in MATLAB. The satisfied GUI software can be developed easily and efficiently due to MATLAB. The developed GUI software can implement the analysis of parametric stability region as well as eigenvalue analysis and time domain simulation of SSO, with the advantage of directness and convenience. It can facilitate numerous technicians to verify the possibility of SSO instability in the power system.