Abstract
Due to the significant reduction of power system inertia, effective frequency control and sufficient power reserve are necessarily required in the renewable energy power system. To achieve this purpose, an accurate estimation of power system inertia is of the first importance. However, existing methods of inertia estimation consider neither the influence of primary frequency control of synchronous generator, nor that of droop control of renewable energy generation, which may cause inevitable deviation of system inertia estimation. To address the problem, a novel approach of inertia estimation is proposed in this paper based on the post-disturbance frequency response data. It properly eliminates the interference of primary frequency control and droop control in inertia estimation by using the equal frequency difference (EFD) principle. Thus it can estimate the inertia accurately only with load frequency data. Finally, the accuracy and validity of the proposed method are verified in the IEEE 39-bus power system.
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