Study On Power System Damping Controller For Governor-side

Low-frequency oscillation often occurs in the big interconnected power systems, which limits the transfer capability of different areas.So it is very important to research the restraining of it.For a long time,governing systems response slower than excitation systems because of the "dead-band" and inertia.But now,with the rapid development and application of digital electronic-hydraulic governor,the response speed of governing systems is not slower than the excitation systems any more,and even that it would have a better effect on the restraining of low-frequency oscillation.This dissertation paid more attention to the damping characteristic of governing system,and found that it's feasible to restrain low-frequency oscillation by controlling the governing systems.To aim at the inter-area oscillation,the author proposed a method to design the damping controller for governor-side,which was based on the theory of "partial state variable feedback control".What's more,the author also considered the influence of time delay.The simulation results showed the effectiveness of the controller.