Methodology for identification of controller parameters of a diesel generator in islanded grid operation

Abstract:
Isolated grid operation has been proposed as a feasible solution in case of long-lasting power blackouts, using the available generation units inside a local area. The availability of reliable generation plant models becomes very important to investigate the new stability margins within an isolated grid. Previous works use simulation models based on simplified controller models or typical controller values found in the literature for stability analysis, which calls into question the applicability of its results in field cases. A more realistic approach, for stability analysis in isolated grids, can be attended by using validated simulation models. However, the absence of general guidelines for parameter validation and optimization makes subsequent analysis difficult. This work proposes a methodology for model validation using measurement data of a synchronous generator powered by a diesel motor, used by a network operator in Germany for emergency power supply during network maintenance. Results show that it is possible to find the best-suited controller parameters, given available standard models for frequency and voltage outputs.