access icon free Research on hydraulic–electric interference and optimisation of multi-turbine hydropower system based on the dual control mode

Aiming at the complex hydraulic and electrical interference, as well as the stability of the hydropower plant that one diversion tunnel supplies water to multiple turbines, a high-order coupling model based on the dual control mode of the speed and excitation regulation is developed. Some scenarios, involving the hydraulic interference law, the effect of partial load rejection on the stability and dynamic characteristics of the units, and the optimisation of the power system stabiliser (PSS), are investigated. It is found that the change of the guide vane opening (or power) of one of the units causes the water hammer in its spiral case and penstock, and the water level fluctuation in the surge chamber. Besides, hydraulic disturbances suffered by other units are mainly caused by water level fluctuation in the surge chamber, rather than directly from the water hammer. The results demonstrate that the unit wiring of the generator and transformer is better than the expansion unit wiring in terms of the dynamic characteristics. In addition, PSS not only can suppress low-frequency oscillations, but also affect the hydraulic transition process, and the improved PSS2B-proportional–integral–derivative can increase the positive damping, and more effective in suppressing system oscillations.

Inspec keywords: tunnels; turbines; hydraulic turbines; power system stability; three-term control; numerical analysis; blades; hydraulic systems; hydroelectric power stations; oscillations; damping

Other keywords: hydraulic disturbances; multiple turbines; hydraulic transition process; diversion tunnel; complex hydraulic; high-order coupling model; water hammer; improved PSS2B-proportional–integral–derivative; excitation regulation; water level fluctuation; spiral case; system oscillations; speed; partial load rejection; hydraulic interference law; dual control mode; penstock; unit wiring; surge chamber; guide vane; electrical interference; expansion unit; power system stabiliser; optimisation; hydraulic–electric interference; hydropower plant; dynamic characteristics; multiturbine hydropower system

Subjects: Mechanical components; Power system control; Numerical analysis; Fluid mechanics and aerodynamics (mechanical engineering); Numerical approximation and analysis; Control of electric power systems; Applied fluid mechanics; Geotechnical structures

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