Visualization of the static voltage stability region in cut-sets space of power systems

The visualization of the security region can improve the observability of power systems and help with quick security assessment of the current operation point and decision-making of preventive measures. The visualization system for the static voltage stability region is described, including its theory, numerical simulation basis, and the software development based on the energy management system (EMS) of Henan Electric Power Dispatching and Communication Center. This software package calculates the boundaries of power transmission limits in cut-set power space according to the data of SCADA and visualizes these boundaries using the OpenGL 3D graphic programming techniques. It provides operators with voltage stability in measurement in an intuitive way. By avoiding large-scale continuous power flow calculation, each calculation period can be completed within seconds or minutes, realizing real time voltage stability monitoring and assessment. The software package is implemented on Digital Unix, which is compatible and portable with several different kinds of UNIX operating systems. This work presents a basis for further combination of this functional module with the new generation of EMS.