Turbine apparatus and governor for turbine
AssigneeHitachi, Ltd.
InventorTakao Kuwabara
Life of this patent
Estimating the term…
Abstract
In a turbine apparatus comprising a runner rotatable to be rotationally driven by a water, a gain of a derivative calculation element generating a derivative component of a control signal for controlling a flow rate of the water which derivative component is to be applied to the derivative calculation element and the integration calculation element by performing differentiation on a difference between an actual rotational speed and a desired rotational speed of the runner with respect to a time proceeding has a value sufficiently increased to converge a value of the control signal toward a desired value in accordance with the time proceeding in S-characteristic portion.
Claims13
A method for operating a pump turbine apparatus including a runner rotatable in either of a direction for driving an electric power generator and a direction for pumping a water, a main shaft for transmitting a rotation of the runner to the electric power generator, a wicket gate for adjusting a flow rate of water for driving the runner, and a governor for controlling an opening area of the wicket gate to change a rotational speed of the runner,
- wherein when the rotational speed of the runner is adjusted to be synchronized with a frequency of an electric power transmission line during rotational start of the runner in an electric power generating mode and a head of the water is not more than a predetermined value, a derivative calculation element is dominant in comparison with the other calculation element to mainly control the rotational speed of the runner in a rotational speed control system.
A method for operating a pump turbine apparatus including a runner rotatable in either of a direction for driving an electric power generator and a direction for pumping a water, a main shaft for transmitting a rotation of the runner to the electric power generator, a wicket gate for adjusting a flow rate of water for driving the runner, and a governor for controlling an opening area of the wicket gate to change a rotational speed of the runner,
- wherein when Q is the flow rate of the water for rotationally driving the runner, H is a head of the water for rotationally driving the runner, N is an actual rotational speed of the runner, N1=N/√H, Q1=Q/√H, and the rotational speed of the runner is adjusted to be synchronized with the frequency of the electric power transmission line during rotational start of the runner in an electric power generating mode with ∂Q1/∂N1>0, gains of a derivative calculation element in a system for controlling the rotational speed of the runner and the other calculation element in the system are changed so that the derivative calculation element is dominant in comparison with the other calculation element in the system.
A method for operating a pump turbine apparatus including a runner rotatable in either of a direction for driving an electric power generator and a direction for pumping a water, a main shaft for transmitting a rotation of the runner to the electric power generator, a wicket gate for adjusting a flow rate of water for driving the runner, and a governor for controlling the wicket gate to change a rotational speed of the runner,
- wherein when Q is the flow rate of the water for rotationally driving the runner, H is a head of the water for rotationally driving the runner, N is an actual rotational speed of the runner, N1=N/√H, Q1=Q/√H, and the rotational speed of the runner is adjusted to be synchronized with the frequency of the electric power transmission line during rotational start of the runner in an electric power generating mode with ∂Q1/∂N1>0, a phase lag of at least one of a timing of transition from an increase of an opening area of the wicket gate to a decrease thereof with respect to a timing of transition from an increase of the rotational speed to a decrease of the rotational speed and a timing of transition from the decrease of the opening area of the wicket gate to the increase thereof with respect to the timing of transition from the decrease of the rotational speed to the increase of the rotational speed is not more than 120 degrees.
A method for operating a pump turbine apparatus including a runner rotatable in either of a direction for driving an electric power generator and a direction for pumping a water, a main shaft for transmitting a rotation of the runner to the electric power generator, a wicket gate for adjusting a flow rate of water for driving the runner, and a governor for controlling the wicket gate to change a rotational speed of the runner,
- wherein when Q is the flow rate of the water for rotationally driving the runner, H is a head of the water for rotationally driving the runner, N is an actual rotational speed of the runner, T is a torque for rotationally driving the runner, N1=N/√H, Q1=Q/√H , T1=T/H , and the rotational speed of the runner is adjusted to be synchronized with the frequency of the electric power transmission line during rotational start of the runner in an electric power generating mode with at least one of ∂Q1/∂N1>0 and ∂T1/∂N1>0, a derivative calculation element is dominant in comparison with the other calculation element to mainly control the rotational speed.
A method for operating a pump turbine apparatus including a runner rotatable in either of a direction for driving an electric power generator and a direction for pumping a water, a main shaft for transmitting a rotation of the runner to the electric power generator, a wicket gate for adjusting a flow rate of water for driving the runner, and a governor for controlling the wicket gate to change a rotational speed of the runner,
- wherein when Q is the flow rate of the water for rotationally driving the runner, H is a head of the water for rotationally driving the runner, N is an actual rotational speed of the runner, N1=N/√H, Q1=Q/√H, and the rotational speed of the runner is adjusted to be synchronized with the frequency of the electric power transmission line during rotational start of the runner in an electric power generating mode with ∂Q1/∂N1>0, the wicket valve is controlled mainly by a derivative calculation element of the governor to keep the rotational speed stable against a variation of the rotational speed, and the other calculation element operates for at least one of controlling the wicket valve to keep the rotational speed against another variation of the rotational speed whose cycle period in variation is significantly longer than that of the variation of the rotational speed against which the derivative calculation element controls the wicket valve, and controlling the wicket valve in a negligible degree.
Dependencies are inferred from the claim text.