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Generator Parameter Validation (GPV)

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Need

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.

GPV Process

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.


Benefits

Generator Parameter Validation Tool provides the following benefits:

  • Validate model parameters without taking units offline
  • Perform model validation on an ongoing basis in a short time frame
  • Perform sensitivity analysis to identify most sensitive parameters for different types of events
  • Calibrate models by identifying correct parameter values

About EPG

Electric Power Group, LLC (EPG) has been pioneering the development and deployment of synchro-phasor technologies since 2000. Our principals have extensive experience in running and managing utility grids, investigating root causes of major blackouts (WECC 1996, EI 2003), and leveraging this deep domain knowledge to develop industry leading synchrophasor technology applications for wide area real time monitoring, visualization and situational awareness.

The EPG team has extensive hands-on experience with synchrophasor standards, networks, system architecture, deployments and performance analysis through work at EPG for leading ISO's and utilities including PJM, NYISO, ERCOT, CAISO, MISO, BPA, TVA, SCE, AEP, LADWP, SRP, Duke, Dominion, NYPA and other companies.