Assessment Accuracy of Power System Frequency Security with Additional Frequency Controls in Wind Turbines

Power grids all over the world are nowadays facing high penetrations of renewable power generation. The converter based generation units play a major role in system behavior and operation. Thereby, also the reliability of the power system is impacted in many different aspects. It has to be verified whether the frequency reliability assessment, which is often studied by simulations, is still accurate, every time a new control structure is considered. For this, the number of simulations should not be further increased if possible, in order to keep the computational efforts low. In this study, we verify that the assessment outcome
will be accurate when the LDC and WPC of a system are described well enough. This is shown to be true for different frequency controls, implemented in wind power plants in the system. Besides, the effect of different LDCs and WPCs are analyzed, as they can change over time. The used methodology is validated on the IEEE-reliability test system (IEEE RTS).