Traditional methods of model validation require the unit to be taken offline. The process is time consuming, expensive and can damage the equipment. Ensuring these models are validated and regularly verified is now a requirement of Generator Owners and Transmission Planners as per the North American Electric Reliability Corporation (NERC) Reliability Standards, namely MOD-026 and MOD-027.
Generator parameter validation is the process of validating generator model parameters using synchrophasor data. GPV enables periodic validation of the generator models without taking the units offline. Generators, governors, exciters and stabilizer models can be validated using this approach. The Generator Parameter Validation (GPV) process (shown below in Figure 1) uses synchrophasor data from Phasor Measurement Units (PMUs) and a hybrid simulation technique to perform playback of grid performance in simulation. The external network is reduced to an equivalent system and then a stepwise approach is used: Validation, Sensitivity Analysis, and Calibration.
Validation results show comparison plots between simulation and measured data. Sensitivity analysis quantifies the effect of each parameter on the generator response and identifies the key parameters having maximum effect. User interaction and engineering input is enabled for key parameter selection and for fine tuning parameter values by specifying ranges for the parameters. Calibration process identifies new parameter values for which the model simulation results best match the measured data. Results from the calibration process are plotted to compare measured data against simulated data for both the initial model parameters and new model parameters. Figure 2 below shows example plots from validation and calibration process. GPV has been successfully tested with simulated and actual PMU data. The GPV tool was built for ERCOT use as a part of the CCET Discovery across Texas project.
Generator Parameter Validation Tool provides the following benefits: