Hamiltonian Additional Damping Control for Suppressing Power Oscillation Induced by Draft Tube Pressure Fluctuation

The power oscillation induced by pressure fluctuation in the draft tube of hydraulic turbine is one limiting factors preventing Francis from operating vibration zone. At present grid with a high proportion renewable energy resources, we try to improve load regulation ability hydropower units extending stable operation zone By mathematical modelling fluctuation, this paper gives an analytical expression oscillation. We derive extended Hamiltonian model unit where external excitation. Secondly, damping injection method introduces some desired interconnection and matrices as factor into additional control. Finally, through theoretical analysis experimental simulation, research discusses resonance characteristics oscillation, equivalent between coefficient, control design crossing during start-up. Simulation results show that when r25 = 1.3, minimum amplitude 0.5466, which increase D 20. maximum decreases 4.6%, limited reduced 10.1%. proposed can effectively suppress expand range.