Abstract
Fast Frequency Response (FFR) is the first barrier to prevent system frequency from falling sharply with high power deficit. Gas turbine is a promising power resource for FFR due to its rapid start-up and high power ramping characteristics, but the ‘Air Hammer Effect’ (AHE) leads to a frequency reverse adjustment in the initial stage which severely limits the effectiveness of frequency response. We focus on the dynamic process of gas turbine’s frequency response and clarify the impact of reverse adjustment on response capacity. In view of the existing models, more attention is paid to the influence of the quasi-steady-state of output power, but the dynamic frequency response is not accurately reflected. We introduce the response time constant of the combustion chamber and build the dynamic frequency response model for gas turbine considering AHE. In addition, the dynamic frequency response characteristics of gas turbine can be analytically deduced by linearizing the Inlet Guide Vanes (IGV) opening process. We perform simulations to demonstrate that the model can accurately describe the reverse adjustment in the initial stage and clarify the impact of AHE on FFR capacity.
Published Version
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