Abstract: A method of suppressing frequency deviations in a power grid relative to a desired frequency behaviour, in particular at hour crossings, wherein an energy storage is connected to the grid, includes: monitoring frequency in the grid relative to the desired frequency behaviour, to determine detected frequency deviations; comparing detected frequency deviations with a threshold; if detected frequency deviations exceed the threshold, deploying the storage to charge therein energy from the grid or to discharge energy therefrom into the grid; and setting a variable threshold. A corresponding system includes: a connection to a power grid; an energy storage selectively connectable to the connection; a frequency monitor connected to the connection; and a control to configured to selectively deploy the energy storage in accordance with the method.

Abstract: The present disclosure relates to a flywheel system. The flywheel system comprises a rotation axis and a flywheel rotor connected to the rotation axis. Further, the system comprises a drive and/or a power generator connected to the flywheel rotor. According to the invention, the flywheel rotor has an outer radius in radial direction of at least 0.85 meter, preferably at least meter, and more preferably at least 1.30 meter. The invention further relates to flywheel rotors having a thickness in axial direction of at least 0.30 meter, preferably at least 0.45 meter, and more preferably at least 0.60 meter. Finally, the invention also relates to a flywheel system of which the rotor has a weight of at least 2.5 tons, preferably at least 4 tons and more preferably at least 5 tons.

Abstract: The present disclosure relates to a flywheel system (1), comprising a ring-shaped flywheel rotor (3), arranged on a rotation axis (7); and a substantially cylindrical casing (2), enveloping the flywheel rotor (3) at least in a radial direction to contain the flywheel (3) in case of a calamity. The flywheel system (1) further exhibits the feature that the casing (2) comprises and having at least one inward protruding bumper (8) defining a variation from the circular shape in cross section of the casing wall (5) surrounding the flywheel rotor (3). The casing wall (5) may itself be circular and the bumper (8) can define a deviation relative to the circular shape thereof, to enhance deceleration of the flywheel rotor (3), if, in case of an accident or calamity, the flywheel rotor (3) comes loose.

Abstract: A method of suppressing frequency deviations in a power grid relative to a desired frequency behaviour, in particular at hour crossings, wherein an energy storage is connected to the grid, includes: monitoring frequency in the grid relative to the desired frequency behaviour, to determine detected frequency deviations; comparing detected frequency deviations with a threshold; if detected frequency deviations exceed the threshold, deploying the storage to charge therein energy from the grid or to discharge energy therefrom into the grid; and setting a variable threshold. A corresponding system includes: a connection to a power grid; an energy storage selectively connectable to the connection; a frequency monitor connected to the connection; and a control to configured to selectively deploy the energy storage in accordance with the method.

Abstract: The invention relates to a device for accumulating inertial energy having a rotor chamber in housing, a rotor in the rotor chamber having a first end face and a substantially opposite second end face, the rotor being mounted, so that it can be displaced and rotate relative to the housing leaving free a gap between the outer rotor perimeter and the inner perimeter of the rotor chamber, wherein a seal is provided in said gap separating a first section of the rotor chamber and a second section of the rotor chamber, exposing means; creating a differential pressure over the rotor for levitation thereof, wherein the device further comprises stabilizing means for counteracting vibration of the rotor.

Abstract: The invention relates to a device for reducing the load on a supporting structure comprising a housing defining a chamber, at least one object having a first face and a substantially opposite second face mounted in the chamber by means of the supporting structure and is displaceable relative to the housing leaving free a gap provided with a seal separating a first section and a second section of the chamber, an exposing means for exposing at least the first face to a gas pressure, thereby generating an upward differential pressure force at least partially compensating the object weight, wherein the seal is supported by a movable part of the housing and the device further comprises a means for adjusting the position of at least said movable part.

Abstract: The invention relates to a device for accumulating inertial energy, comprising a housing (12) defining a rotor chamber (16), at least one rotor (18) having a bottom end face (26) and a substantially opposite top end face (24), the rotor (18) being mounted in the rotor chamber (16) so that it can rotate relative to the housing (12) about a vertical axis of rotation (20) leaving free a gap (32), wherein a seal (36) is provided in the gap (32) separating an upper section (34) of the rotor chamber (16) and a bottom section (38) of the rotor chamber (16), a means (40) for exposing at least the bottom end face (26) of the rotor (18) in the bottom section (38) to a gas pressure which, by comparison with the pressure applied to the substantially opposite top end face (24) in the upper section (34) generates an upward differential pressure force that at least partially compensates for the weight of the rotor (18), and the device is provided with means (40) for reducing the pressure in said upper section (18).

Abstract: The invention relates to a device for accumulating inertial energy having a rotor chamber in housing, a rotor in the rotor chamber having a first end face and a substantially opposite second end face, the rotor being mounted, so that it can be displaced and rotate relative to the housing leaving free a gap between the outer rotor perimeter and the inner perimeter of the rotor chamber, wherein a seal is provided in said gap separating a first section of the rotor chamber and a second section of the rotor chamber, exposing means; creating a differential pressure over the rotor for levitation thereof, wherein the device further comprises stabilizing means for counteracting vibration of the rotor.

Abstract: The invention relates to a device for accumulating inertial energy, comprising a housing (12) defining a rotor chamber (16), at least one rotor (18) having a bottom end face (26) and a substantially opposite top end face (24), the rotor (18) being mounted in the rotor chamber (16) so that it can rotate relative to the housing (12) about a vertical axis of rotation (20) leaving free a gap (32), wherein a seal (36) is provided in the gap (32) separating an upper section (34) of the rotor chamber (16) and a bottom section (38) of the rotor chamber (16), a means (40) for exposing at least the bottom end face (26) of the rotor (18) in the bottom section (38) to a gas pressure which, by comparison with the pressure applied to the substantially opposite top end face (24) in the upper section (34) generates an upward differential pressure force that at least partially compensates for the weight of the rotor (18), and the device is provided with means (40) for reducing the pressure in said upper section (18).

Abstract: Two identical differential mechanisms are mounted in parallel between the input shaft connected to the rotor 1 of the wind generator by a speed step-up device, and the output shaft connected to a synchronous generator. The two planet gears are secured to the output shaft. The two planet carriers are secured to the input shaft. The two annulus gears therefore rotate at the same speed. They are connected by slightly differing transmission ratios, of which one is also reversing with respect to the other, to the two input elements of a comparator differential. The cage of this differential rotates at a speed equal to half the difference between the absolute values of the rotational speeds of the elements. After multiplication by gearing, this low speed is applied to the rotor of a regulating apparatus such as an electric generator. The transmission ratio is adjusted or regulated by altering the torque applied by the regulating generator.