Abstract: The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates. The method includes a step of increasing the flow of water into the runner from a time t0 to a time t1 so that the rotation frequency of the rotor of the synchronous generator is, at time t1 equal to the frequency of the grid, and closing the circuit breaker at time t1. A sub-interval from a time t2 to time t1 is defined, with t0<=t2<t3<=t1, wherein a sub-step is executed to apply an adjustment torque to the shaft line via a first actuator that controls the flow of water into the runner and a second actuator coupled to a stator of the synchronous generator.

Abstract: The invention concerns a method for coupling a hydroelectric power plant in a turbine mode to a grid, in order to generate power for a grid, said hydroelectric power plant comprising at least a first hydroelectric unit (10) and a second hydroelectric unit (100), each provided with a runner (6) mechanically coupled to a shaft line (8) and to a generator, a distributor (4) comprising guide vanes to control a flow of water to said runner, said hydroelectric power plant further comprising a variable frequency drive (20), the method comprising: a) starting the rotation of at least said first hydroelectric unit (10) and said second hydroelectric unit (100); b) connecting the variable frequency drive (20) to the generator of the first hydroelectric unit (10) and to the grid and stabilizing the speed of the first hydroelectric unit c) connecting the first hydroelectric unit (10) to the grid and disconnecting the generator of the first hydroelectric unit from the variable frequency drive (20); d) connecting said va

Abstract: This installation for converting a hydraulic energy into electrical energy comprises a hydraulic adapted to be operated either in a pump mode or in a turbine mode. It further comprises means (25) for applying an electric torque to the rotor to control the rotation speed of the machine during transitions between the pump mode and the turbine mode.

Abstract: This method for stabilizing the rotation speed of a hydraulic machine having S-characteristic and comprising a distributor (9) is adapted to modify a water flow, so that the machine can be coupled to a grid. The method comprises the steps of calculating an orientation of the distributor (9); and orienting the distributor according to the calculated orientation. The method further comprises the steps of providing an electric torque to the machine so as to reach a target speed.

Abstract: A method for stabilizing the rotation speed of a machine with S-characteristics is provided. The method includes calculating a target net head and a target opening to affect guide vanes of the machine, the target net head and the target opening being calculated so that the torque exerted by water flow on the turbine is null and that the machine rotates at a target rotation speed; determining a real net head to which the machine is subjected; comparing the target net head with the real net head; and adjusting the opening of the guide vanes so as to converge towards the target opening and reduce a height difference between the target net head and the real net head.

Abstract: The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates. The method includes a step of increasing the flow of water into the runner from a time t0 to a time t1 so that the rotation frequency of the rotor of the synchronous generator is, at time t1 equal to the frequency of the grid, and closing the circuit breaker at time t1. A sub-interval from a time t2 to time t1 is defined, with t0<=t2<t3<=t1, wherein a sub-step is executed to apply an adjustment torque to the shaft line via a first actuator that controls the flow of water into the runner and a second actuator coupled to a stator of the synchronous generator.

Abstract: The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates, the method comprises: a) a step of increasing the flow of water into the runner from a time t0 to a time t1 so that the rotation frequency of the rotor of the synchronous generator is, at time t1 equal to the frequency of the grid; b) a step of closing the circuit breaker at time t1, step a) further comprises a sub-step a1) executed from a time t2 to time t1, wherein the flow of water is adjusted so that, at time t1, the phase of the synchronous generator is aligned with the grid phase.

Abstract: The invention concerns a method for starting a hydroelectric turbine (10) provided with a runner (6) mechanically coupled to a shaft line (8), a distributor (4) comprising leak tight guide vanes to control a flow of water to said runner, a spiral case (12) for supplying water to said runner, said spiral case comprising a duct connected to a main inlet valve (14), the method comprising: a) a step of balancing pressures on both sides of said main inlet valve (14), and of at least partially opening said main inlet valve (14), while the leak-tight guide vanes of the distributor (4) are closed, water pressurized at an upstream level being present in said spiral case and at said distributor (4); b) then a step of opening the leak-tight guide vanes of the distributor (4).

Abstract: The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates, the method comprises: a) a step of increasing the flow of water into the runner from a time t0 to a time t1 so that the rotation frequency of the rotor of the synchronous generator is, at time t1 equal to the frequency of the grid; b) a step of closing the circuit breaker at time t1, step a) further comprises a sub-step a1) executed from a time t2 to time t1, wherein the flow of water is adjusted so that, at time t1, the phase of the synchronous generator is aligned with the grid phase.

Abstract: This method allows determining the operating point of a hydraulic machine in a considered operating range, such as turbine mode, and comprises steps that consist in a) determining two coordinates (N?11, T?11) of a first series of potential operating points of the hydraulic machine for the orientation affected to guide vanes of the machine, b) measuring the rotation speed of the machine, and c) determining the torque exerted by water flow on the machine. The method further includes steps consisting in d) calculating two coordinates (N11, T11) of a second series of potential operating points of the machine in function of the rotation speed (N) measured at step b) and the torque determined at step c), and e) deducing the two coordinates (N11_real, T11_real) of operating point that belongs both to the first and the second series in the said considered operating range of the machine.

Abstract: This installation for converting a hydraulic energy into electrical energy comprises a hydraulic adapted to be operated either in a pump mode or in a turbine mode. It further comprises means (25) for applying an electric torque to the rotor to control the rotation speed of the machine during transitions between the pump mode and the turbine mode.

Abstract: Installation for converting hydraulic energy into electrical energy, provided with a fixed speed hydraulic machine comprising a pump-turbine (2) linked to a generator (20) by a shaft. The installation further comprises: an electrical torque actuator (34) to establish a circuit with the generator (20), electrical torque actuator connection means (35) for connecting the generator (20) the electrical torque actuator, and command means (29) for detecting a disconnection of the generator (20) from the grid, and for commanding the electrical torque actuator connection means (35) to connect the generator (20) to the electrical torque actuator (34).

Abstract: This method for stabilizing the rotation speed of a hydraulic machine having S-characteristic and comprising a distributor (9) is adapted to modify a water flow, so that the machine can be coupled to a grid. The method comprises the steps of calculating an orientation of the distributor (9); and orienting the distributor according to the calculated orientation. The method further comprises the steps of providing an electric torque to the machine so as to reach a target speed.

Abstract: The method allows stabilizing the rotation speed of a hydraulic machine with S-characteristics. It is implemented by means of a control loop feedback system having a controller for calculating an orientation to affect guide vanes of the machine. It includes steps of calculating a set of internal states associated with the operating point of the machine, establishing a linearized transfer function in function of the set of internal states, calculating characteristics parameters of the controller in function of the established transfer function so that the control loop feedback system is stable, measuring the rotation speed of the hydraulic machine, comparing the measured rotation speed with a target rotation speed, and adjusting the orientation affected to the guide vanes so as to reduce the speed difference between the calculated rotation speed and the target rotation speed.

Abstract: A method for stabilizing the rotation speed of a machine with S-characteristics is provided. The method includes calculating a target net head and a target opening to affect guide vanes of the machine, the target net head and the target opening being calculated so that the torque exerted by water flow on the turbine is null and that the machine rotates at a target rotation speed; determining a real net head to which the machine is subjected; comparing the target net head with the real net head; and adjusting the opening of the guide vanes so as to converge towards the target opening and reduce a height difference between the target net head and the real net head.

Abstract: The method allows stabilizing the rotation speed of a hydraulic machine with S-characteristics. It is implemented by means of a control loop feedback system having a controller for calculating an orientation to affect guide vanes of the machine. It includes steps of calculating a set of internal states associated with the operating point of the machine, establishing a linearized transfer function in function of the set of internal states, calculating characteristics parameters of the controller in function of the established transfer function so that the control loop feedback system is stable, measuring the rotation speed of the hydraulic machine, comparing the measured rotation speed with a target rotation speed, and adjusting the orientation affected to the guide vanes so as to reduce the speed difference between the calculated rotation speed and the target rotation speed.

Abstract: This method allows determining the operating point of a hydraulic machine in a considered operating range, such as turbine mode, and comprises steps that consist in a) determining two coordinates (N?11, T?11) of a first series of potential operating points of the hydraulic machine for the orientation affected to guide vanes of the machine, b) measuring the rotation speed of the machine, and c) determining the torque exerted by water flow on the machine. The method further includes steps consisting in d) calculating two coordinates (N11, T11) of a second series of potential operating points of the machine in function of the rotation speed (N) measured at step b) and the torque determined at step c), and e) deducing the two coordinates (N11_real, T11_real) of operating point that belongs both to the first and the second series in the said considered operating range of the machine.