Abstract: An energy storage and recovery system employs air compressed utilizing power from an operating wind turbine. This compressed air is stored within one or more chambers of a structure supporting the wind turbine above the ground. By functioning as both a physical support and as a vessel for storing compressed air, the relative contribution of the support structure to the overall cost of the energy storage and recovery system may be reduced, thereby improving economic realization for the combined turbine/support apparatus. In certain embodiments, expansion forces of the compressed air stored within the chamber, may be relied upon to augment the physical stability of a support structure, further reducing material costs of the support structure.

Abstract: A wind turbine having a rotor, a generator driven by the rotor, a converter, a control device having an input for a control signal for reactive power output and a controller for the converter, the controller determining a reactive power target value for the wind turbine and correcting the output reactive power in dependence on the voltage present at the wind turbine, and an additional module for the controller having separate small and large signal paths and interacting with the controller such that the small signal path has an additional storage element in comparison with the large signal path, which additional storage element stores state values of the small signal path for the past. Thus, small voltage changes can be reacted to more slowly and while taking into account past values, whereas large changes can be reacted to quickly, in particular in the event of a network short circuit.

Abstract: A power generator for a hydro turbine is axially coupled to the hydro turbine. The generator comprises a rotor arranged to rotate about an axis in response to fluid flow through said turbine. A first stator structure incorporates at least a first winding disposed circumferentially around the axis and axially displaced in a first inboard direction from the rotor. A second stator structure incorporates a least a second winding disposed circumferentially around the axis and axially displaced in a second outboard direction from the rotor, the rotor being arranged to electrically couple with the windings.

Abstract: A power converter includes a first set of transistors electrically connected in series, a second set of transistors electrically connected in series, and an AC link. The second set of transistors is electrically connected in parallel with the first set of transistors to form an H-bridge. The AC link is electrically connected between the first and second sets of transistors. A plurality of H-bridges are connected in parallel and a three-wire DC bus is electrically connected to the H-bridges.

Abstract: This invention relates to a method and a power plant controller arranged to carry out the method. The method is on an intelligent dispatching of the power production to wind turbines and optional compensation equipment of a wind power plant, as the power producing units of a wind power plant. The invention relates to a case where the requested produced power (both active and reactive) is less than the total capacity of the power plant, and the invention relates to utilizing this situation to dispatch set points to the wind turbines and the compensation equipment based on correction factors relating to the operating conditions of the wind park. This method may increase the wind turbines' life time, help in scheduling maintenance and expand the electrical operating range of the wind power plant.

Abstract: Methods and a voltage regulator are provided for distributing power sourcing in a hybrid power plant system. The voltage regulator is configured to monitor an output power of a generator and control an excitation signal provided to the generator based at least in part on the generator output power.

Abstract: Techniques for controlling engine speed based on alternator duty cycle to increase overall vehicle efficiency involve increasing engine speed only after the alternator duty cycle exceeds a duty cycle threshold that is less than the maximum duty cycle of the alternator. In this manner, quantity and/or degree of engine speed increases are decreased, which increases vehicle efficiency (e.g., increased fuel economy). Moreover, by utilizing a duty cycle threshold that is less than the maximum alternator duty cycle threshold, voltage drops at an electrical system are avoided. These techniques are also applicable to both conventional alternators and smart alternators having on-board diagnostic circuitry.

Abstract: A power system for an electrical system with highly fluctuating loads is powered by one or more power sources that are slow to react to load changes. The power sources are connected to electrical equipment used on the drill rig which provide active load to the generators. One or more load banks may be positioned to provide passive load to the generators to maintain generally constant generator load, while allowing for instant access to power as active load increases. Generators may be run at 100% capacity, a maximum efficient capacity, or at a high enough level to allow for a sufficiently rapid increase in power output. At least one parameter of a drilling operation may be utilized to anticipate load demand changes.

Abstract: An output by a wind farm including multiple wind power generation devices is controlled by an output control device. To control the output, (1) a potential estimator estimates an outputtable maximum power amount by each wind power generation device, (2) a control amount determiner determines a control amount of the whole wind farm based on the maximum power amount estimated by the potential estimator, (3) a control timing adjuster adjusts a control timing of the control amount of the whole wind farm, (4) a control amount distributer distributes the control amount having undergone the control timing adjustment based on an available power generation amount of each wind power generation device.

Abstract: A wind energy installation having a wind rotor, a generator which is driven thereby and interacts with a converter in order to produce electrical power, rotation-speed regulation and converter control which interacts therewith, wherein the rotation-speed regulation outputs a nominal rotation speed signal (nref). Furthermore, additional regulation is provided, which has an input for an additional power and is designed to produce a rotation speed change signal therefrom, taking account of a rotator inertia moment, and to output this as an output signal, which is added to the nominal rotation speed signal via a logic element. Kinetic energy is taken from the wind rotor in a controlled manner by reducing the rotation speed and is converted by the generator to additional electrical energy. This allows primary regulation power to be made available deliberately by rotation speed variation, to be precise even in unsteady wind conditions.

Abstract: A method of operating a wind turbine is provided. The wind turbine comprises a turbine rotor with at least one blade having a variable pitch angle, a power generator, and a power converter connected to the power generator via a first circuit breaker and to a power grid via a second circuit breaker. According to the method, overvoltage events at the power grid are monitored. If an overvoltage event is detected, the method comprises opening the first circuit breaker and the second circuit breaker, disabling active operation of the power converter, connecting a power dissipating unit to the power generator to dissipate power output from the power generator, and moving the pitch angle of the at least one blade towards a feathered position.

Abstract: The present invention relates a wind turbine generator with an electrical generator, a dump load unit, for dissipating power, a wind turbine power controller and a damping controller both arranged to control wind turbine components based on a damping reference signal, the damping reference signal is a combined signal, and comprises a first reference signal and a second reference signal, the second reference signal is an oscillating part, the wind turbine power controller is controlling the power from the electrical generator according to the first reference signal and the damping controller is controlling the dump load unit to dissipate power according to the second reference signal. The invention also relates to a method for damping oscillations with wind turbine generators.

Abstract: Apparatus for generating and supplying electrical power to AC loads on an aircraft may include a prime mover, an exciter generator rotatably coupled to the prime mover and a main generator with a main generator rotor electrically coupled to the exciter generator to receive AC power from the exciter generator. One or more capacitors may be electrically coupled to the main generator rotor to increase a power factor of the main generator rotor.

Abstract: A high-altitude wind power generation system with a cycloidal turbine and a motor-generator, and a method of operating the same. The system includes a buoyant apparatus configured to be inflated when buoyancy generating gas is injected therein; a cycloidal turbine configured to be placed under the buoyant apparatus, and comprise a rotary shaft arranged to be substantially horizontal to the ground, and a plurality of blades arranged along a circumferential direction of the rotary shaft while their pitch center lines are long extended to be parallel with a center line of the rotary shaft and are spaced apart from the rotary shaft at a preset distance as being arranged to be substantially perpendicular to a flowing direction of fluid blowing from a front, having pitch angles individually adjustable with respect to the pitch center line; and a motor-generator configured to connect with the rotary shaft of the cycloidal turbine.

Abstract: An on-vehicle power generation control unit includes current detecting unit; communication unit; holding unit; maximum current determining unit; and current control unit. The current detecting unit detects the excitation current at the field winding. The communication unit communicates with an external equipment to receive a first upper limit. The holding unit holds a second upper limit. The maximum current determining unit determines a maximum current to be the second upper limit when the first upper limit has not received by the communication unit or when the received first upper limit is more than or equal to the second upper limit. Further, the maximum current determining unit determines the maximum current value to be the first upper limit when the received first upper limit is less than the second upper limit. The current control unit controls the detected excitation current to be within the maximum current value.

Abstract: A downhole assembly including a turbine to be disposed within a wellbore and a rotating array. The rotating array includes magnetic material and is coupled to the turbine. The downhole assembly also includes a magnetostrictive material coupled to the rotating array to strain the magnetostrictive material to induce an electric current in a conductor coupled to the magnetostrictive material.

Abstract: The invention relates to a steam turbine governing system for maintaining synchronization between an electrical grid and an electric generator, driven by a steam turbine, after the occurrence of a grid short circuit at the electrical grid. The governing system includes a governor adapted to control an arrangement of valves for regulating the steam flow in the steam turbine and means for measuring the voltage drop at the output of the electric generator. The governing system further includes means for measuring the electric power drop at the output of the electric generator. The governor is adapted to initiate operation of the arrangement of valves of the steam turbine in response to a voltage drop exceeding a predetermined value and to an electric power drop exceeding a predetermined value.

Abstract: An emergency starting system and an emergency starting method of a fuel cell hybrid vehicle perform an emergency start when a DC power converter for starting fails. The emergency starting system includes: a fuel cell and a super capacitor connected through a main bus terminal in parallel; a driving inverter connected to the main bus terminal; a driving motor connected to the driving inverter; a balance-of-plant configured to activate the fuel cell; a starting DC power converter configured to drive the balance-of-plant; and a starting controller configured to control the super capacitor at the time of a start. The starting controller includes a super capacitor relay, an initial charging relay, and an initial charging resistor, the initial charging relay includes a plurality of relays, and the initial charging resistor includes a plurality of resistors.

Abstract: A power generating set includes an engine operable in response to a flow of fuel to produce a flow of exhaust gas. A generator is coupled to the engine and is operable in response to operation of the engine to produce a total electrical power, a primary load is electrically connected to the generator to receive a portion of the total electrical power, and a secondary load is selectively connected to the generator to receive a portion of the total electrical power. An insulated-gate bipolar transistor (IGBT) is positioned to selectively transition between a connected state and a disconnected state. The secondary load is connected to the generator when the IGBT is in the connected state and is disconnected from the generator when the IGBT is in the disconnected state.

Abstract: A process for increasing the excitation current, particularly when activating the alternator, whose rectified alternator voltage is regulated by way of a regulator, is provided. For regulating the alternator voltage, the regulator sets the excitation current of an excitation winding of the alternator. The regulator further receives a phase signal. A rapid increasing of the excitation current to a defined value takes place, during which the phase signal is analyzed simultaneously. This rapid increasing continues until the phase signal or a quantity derived therefrom meets a defined condition with respect to the alternator voltage. Therefore, a further increasing of the excitation current takes place, preferably at a rate of change reduced with respect to the previous rapid increase.