Voltage Stability Applications Using Synchrophasor Data

The main objective of this project is to develop a voltage stability margin computation method using PMU data. The approach is to use the PMU data to estimate the Thevenin equivalent voltage and reactance, allowing a smaller size system to be analyzed for real-time stability application. Simultaneously, a new steady-state voltage stability technique called the AQ-bus method has been developed, which benefited this proposed voltage stability method. The program was handed over to BPA to allow for calculation, in an off-line capacity, of stability concerns. Continued communication is ongoing allowing for adjustments and improved accuracy. Further applications of this project are in developing tools and procedures that will be demonstrated within the WECC system to examine voltage instabilities. An example showing the GUI is given on the NASPI website.