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Use of a common electrical power bus to which a number of electrical power generators and consumers are coupled is well known. Typically, a high electrical capacitance is provided across the bus in order to provide stabilisation in the switching of generators and consumer devices as well as differe

Use of a common electrical power bus to which a number of electrical power generators and consumers are coupled is well known. Typically, a high electrical capacitance is provided across the bus in order to provide stabilisation in the switching of generators and consumer devices as well as differences in the operational performances of the electrical power generators. Particularly in aerospace applications provision of high capacity electrical capacitors creates problems. By providing a feedback control and an electrical power converter take primary electrical power from an electro-mechanical converter associated with a rotating component of a prime mover, electrical power stabilisation is achieved by applying torque changes through the electromechanical converter to the rotating component of the prime mover such that stored electrical power can then be drawn as required to accommodate transients in electrical power on the bus.

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We claim: 1. An electrical power stabilization arrangement comprising a prime mover having a rotating component and an electro-mechanical converter associated with the rotating component of the prime mover to convert electrical rotation into electrical power and vice versa by variable applied torqu

We claim: 1. An electrical power stabilization arrangement comprising a prime mover having a rotating component and an electro-mechanical converter associated with the rotating component of the prime mover to convert electrical rotation into electrical power and vice versa by variable applied torque, the electro-mechanical converter being coupled to an electrical power converter, the electrical power converter being coupled to an electrical power bus, the electrical power converter being arranged to convert primary electrical power supplied from the electromechanical converter to secondary electrical power for the electrical power bus, a feed back control being arranged to determine the electrical power on the electrical power bus, the feedback control being arranged to stabilize electrical power on the electrical power bus, the feedback control being coupled to the electrical power converter and being arranged to adjust the secondary electrical power supplied by the electrical power converter to the electrical power bus, the feedback control being arranged to modulate the torque on the rotating component, the feedback control being arranged such that the electrical power converter supplies primary electrical power to the electromechanical converter to provide supplemental torque drive in the electromechanical converter to store energy in the form of torque in the electromechanical converter and the rotating component if the feedback control determines the voltage of electrical power on the electrical power bus is too high and causing electrical instability on said electrical power bus, and the feedback control being arranged such that energy stored as excess torque within the electromechanical converter and rotating component is converted by the electromechanical converter to primary electrical power and supplied to the electrical power converter to supplement secondary electrical power supplied by the electrical power converter to the electrical power bus if the feedback control determines the voltage of electrical power on the electrical power bus is too low and causing instability on said electrical power bus. 2. An arrangement as claimed in claim 1 wherein the primary electrical power is of an alternating current. 3. An arrangement as claimed in claim 1 wherein the secondary electrical power is a direct current. 4. An arrangement as claimed in claim 1 wherein the electro-mechanical converter is an electrical machine. 5. An arrangement as claimed in claim 4 wherein the electro-mechanical converter is a generator/motor. 6. An arrangement as claimed in claim 1 wherein the electrical power bus has a number of generator and/or consumer devices associated with it and the feed back control is configured to stabilize electrical power provided on the electrical power bus as a result of variable switching of these devices. 7. An arrangement as claimed in claim 1 wherein the prime mover is a gas turbine engine. 8. An arrangement as claimed in claim 1 wherein the feedback control comprises a voltage divider arranged across the electrical power bus and a tap connector arranged to draw an electrical signal through a filter to a control device which is arranged to act on the electrical power converter. 9. An arrangement as claimed in claim 8 wherein the voltage divider comprises two resistors. 10. An arrangement as claimed in claim 9 wherein the electrical power converter comprises electronic gates, the control device is arranged to act upon the electronic gates to control the supply of secondary electrical power to the electrical power bus. 11. An arrangement as claimed in claim 10 wherein the control device is arranged to adjust the electronic gates to adjust the primary electrical power supplied to or from the electro-mechanical converter. 12. An arrangement as claimed in claim 1 wherein the rotating component has high inertia and modulation of the torque has limited effect on the rotational speed of the rotating component. 13. A method of operating an electrical power stabilization arrangement comprising a prime mover having a rotating component and an electromechanical converter associated with the rotating component of the prime mover to convert rotation of the rotating component into primary electrical power and visa-versa by variable applied torque, the electromechanical converter being coupled to an electrical power converter, the electrical power converter being coupled to an electrical power bus, the electrical power converter being arranged to convert primary electrical power supplied from the electromechanical converter to secondary electrical power for the electrical power bus, the method comprising determining the electrical power on the electrical power bus in order to adjust the secondary electrical power supplied by the electrical power converter to the electrical power bus to stabilize the electrical power on the electrical power bus, the method further comprising modulating the torque on the rotating component by supplying primary electrical power from the electrical power converter to the electromechanical converter to provide supplemental torque drive in the electromechanical converter to store energy in the form of torque in the electromechanical converter and the rotating component when the voltage of electrical power on the electrical power bus is too high and causing instability on said electrical power bus, and converting energy stored in the form of torque within the electromechanical converter and rotating component to primary electrical power using the electromechanical converter and supplying the primary electrical power to the electrical power converter to supplement secondary electrical power supplied by the electrical power converter to the electrical power bus when the voltage of electrical power on the electrical power bus is too low and causing instability on said electrical power bus. 14. An electrical power stabilization arrangement comprising a prime mover having a rotating component and an electromechanical converter associated with the rotating component of the prime mover to convert rotation of the rotating component into primary electrical power and visa-versa by variable applied torque, the electromechanical converter being coupled to an electrical power converter, the electrical power converter being coupled to an electrical power bus, the electrical power converter being arranged to convert primary electrical power supplied from the electromechanical converter to secondary electrical power for the electrical power bus, a feedback control being arranged to determine the electrical power on the electrical power bus in order to adjust the secondary electrical power supplied by the electrical power converter to the electrical power bus to stabilize the electrical power on the electrical power bus, the feedback control being arranged to modulate the torque in the electromechanical converter and rotating component, the electric power converter being arranged to supply primary electrical power to the electromechanical converter to store energy in the form of torque in the electromechanical converter and the rotating component when the voltage of electrical power on the electrical power bus is too high and causing instability on said electrical power bus and the electromechanical converter being arranged to convert energy stored in the form of torque within the electromechanical converter and rotating component to primary electrical power when the voltage of electrical power on the electrical power bus is too low and causing instability on said electrical power bus. 15. A method of operating an electrical power stabilization arrangement comprising a prime mover having a rotating component and an electromechanical converter associated with the rotating component of the prime mover to convert rotation of the rotating component into primary electrical power and visa-versa by variable applied torque, the electromechanical converter being coupled to an electrical power converter, the electrical power converter being coupled to an electrical power bus, the electrical power converter being arranged to convert primary electrical power supplied from the electromechanical converter to secondary electrical power for the electrical power bus, the method comprising determining the electrical power on the electrical power bus in order to adjust the secondary electrical power supplied by the electrical power converter to the electrical power bus to stabilize the electrical power on the electrical power bus, the method further comprising modulating the torque in the electromechanical converter and rotating component, supplying primary electrical power to the electromechanical converter and storing energy in the form of torque in the electromechanical converter and the rotating component when the voltage of electrical power on the electrical power bus is too high and causing instability on said electrical power bus and converting energy stored in the form of torque within the electromechanical converter and rotating component to primary electrical power using the electromechanical converter when the voltage of electrical power on the electrical power bus is too low and causing instability on said electrical power bus.