An Improved PMU Model for Voltage Response in Transient Stability Simulation

Large scale power networks are typically simulated only on transient stability analysis (TSA) software. This is sufficient when modelling slow moving ac quantities is of interest and is much faster than using time domain electromagnetic transient programs. However, TSA tools are not capable of modelling the subcycle dynamics well. Since wide-area measurement systems are practically only modelled on TSA software, while evaluating potential phasor measurement unit (PMU) based control schemes, researchers/utilities depend on TSA results to approximate PMU measurements. This is not sufficient to ensure adequate real-world performance. This research focused on creating a test bench for characterising the dynamic performance of PMUs. Using voltage magnitude data from this test bench, an improved PMU model for transient stability simulation has been created. The model achieves fits of over 97% across the test cases it was validated with, which is a substantial improvement over the raw TSA simulation results (63-77% accuracy).M.A.S