Adaptive Fast Frequency Response for Power Electronic Connected Energy Sources

Future frequency control methods will be required to operate in faster timeframes than traditional forms of frequency control. Key to providing fast frequency response within low inertia systems will be power electronic (PE) interfaced energy sources. Along with improving the timeframe and quantity of response, they will also need to be scalable without causing detrimental impacts to other forms of dynamic system behavior. Simply allowing the PE-based fast frequency controls to respond quickly under small disturbances may lead to unwanted oscillatory behavior. To overcome this potential behavior, this paper proposes the use of an adaptive frequency control implementation that uses fast Fourier Transform (FFT) along with an adaptive algorithm to detect oscillatory behavior and adjust the time constant of a first order filter. The use of this adaptive frequency control is shown to significantly reduce oscillatory frequency control action for small disturbances, without reducing the timeframe of operation under large disturbances.