Uncertainty in real-time voltage stability assessment methods based on Thévenin equivalent due to PMU's accuracy
- Resource Type
- Conference
- Authors
- Perez, Angel; Moller, Jakob; Johannsson, Hjortur; Ostergaard, Jacob
- Source
- IEEE PES Innovative Smart Grid Technologies, Europe Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), 2014 IEEE PES. :1-6 Oct, 2014
- Subject
- Communication, Networking and Broadcast Technologies
Computing and Processing
Power, Energy and Industry Applications
Phasor measurement units
Voltage measurement
Uncertainty
Stability criteria
Measurement uncertainty
Power system stability
Voltage stability
long term dynamics
synchronized phasor measurements
wide area monitoring
voltage stability margin
Total vector error
- Language
- ISSN
- 2165-4816
2165-4824
This article studies the influence of PMU's accuracy in voltage stability assessment, considering the specific case of Thévenin equivalent based methods that include wide-area information in its calculations. The objective was achieved by producing a set of synthesized PMU measurements from a time domain simulation and using the Monte Carlo method to reflect the accuracy for the PMUs. This is given by the maximum value for the Total Vector Error defined in the IEEE standard C37.118. Those measurements allowed to estimate the distribution parameters (mean and standard deviation) of the studied voltage stability indices and grid transformation coefficients which have applications in voltage stability assessment. The obtained distributions have a direct impact in the number of samples needed for estimating system parameters and compromise between time-scale and uncertainty in those estimations is shown.