摘要:
A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.
摘要:
A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.
摘要:
A power generating system wherein a turbine is mounted on top of a tower or tethered underwater. The turbine includes a rotor having a main blade connected to a rotor hub and an extender section. An adjusting device positions the extender blade between a retracted position within the main blade and to an extended position to expose more or less of the rotor to the fluid flow. The adjusting device includes a servo-controlled rack and pinion mechanism that converts rotation of the pinion by a servomotor into linear motion of the extender blade. A generator is connected to the turbine for generating electrical energy.
摘要:
An electric power-generating device with a rotor turned by an external source of energy, such as wind or water currents. The rotor is coupled to a main shaft. A pair of bull gears is located on the main shaft. A number of intermediate gears are located around a perimeter of the bull gears. An intermediate gear is connected to an input shaft having a double helix pinion that engages the pair of bull gears. The other intermediate gears are similarly connected to respective input shafts having double helix pimons that engage the pair of bull gears. A plurality of output shafts is provided. An output shaft has a single-helix output pinion that engages two adjacent intermediate gears. The other output shafts are similarly connected to respective adjacent intermediate gears. A number of rotational devices are connected to the output shafts.
摘要:
A tall tower is divided into an upper section with a tower top and a lower section with a tower bottom. The sections are hinged together. The lower section is hinged to a tower base. A telescoping crane is attached to a lift point on the lower section. The crane is extended to lift the sections to the vertical position with the lower section resting on the base and the tower top of the upper section near ground level. A heavy load is attached to the tower top end using a small ground crane while the tower top of the upper section is near ground level. The telescoping crane is attached to another lift point on the upper section to partially lift the upper section, which is supported in this position. The telescoping crane is relocated and reattached to the lift point on the upper section. The telescoping crane is fully extended to raise the upper section and load to vertical above the lower section.
摘要:
A wind or water flow energy converter comprising a wind or water flow actuated rotor assembly. The rotor comprises a plurality of blades, wherein the blades of are variable in length to provide a variable diameter rotor. The rotor diameter is controlled to fully extend the rotor at low flow velocity and to retract the rotor as flow velocity increases such that the loads delivered by or exerted upon the rotor do not exceed set limits.
摘要:
A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.