Validation of a static VAr system model for a renewable project for grid code compliance

Power system dynamic models are the foundation for transient stability simulations which are usually part of transmission planning studies. Accurate dynamic simulations are crucial for reliable and secure operation of a transmission system and the precision of power system stability analysis depends on the accuracy of the models used to represent system equipment. Therefore, the validation of power system dynamic models is critical for producing correct simulation results. Comparison of dynamic simulations with field measurements is necessary to validate the quality of a dynamic model. This paper presents the validation process for a Static VAr System (SVS) model with field measurements for a transmission system application. The SVS under consideration includes a STATCOM (a FACTS device) and coordinated mechanically switched shunt elements. This SVS was designed and installed for a renewable project for grid code compliance. The control parameters of this model were first estimated and then tuned based on the actual equipment control parameters to fit simulations to field measurements from the transmission system. Comparison of the model simulation results with the field measurements shows that the validated model generates responses very close to the field test results. The SVS model validation and submission to the transmission system operator is a requirement of the grid code. The validated SVS model has been successfully used for several transmission planning studies and is appropriate and accurate for these types of studies.