Abstract: Systems and methods are disclosed of an engine driven power system that includes a permanent magnet generator coupled to the engine. An energy storage device is connected to the permanent magnet generator. A controller controls the energy storage device to provide power to the permanent magnet generator to start the engine.

Abstract: Provided is a method of assessing rotor temperature during operation of a permanent magnet synchronous machine, including a stator having at least one winding set, the method including: providing reference flux linkage values for different rotor and stator temperature values and current values of an operating winding set; measuring an actual rotor temperature value; measuring an actual stator temperature value; measuring an actual current value of an operating winding set; deriving and storing reference flux linkage values for a given set of operating conditions, in particular, by means of a reference run; deriving a reference flux linkage value (for the measured actual rotor and stator temperature values and the measured actual current value of the operating winding set) using the flux model; obtaining a voltage value; deriving an estimated flux linkage value; deriving a rotor temperature offset; and assessing the rotor temperature based on the rotor temperature offset.

Abstract: A compressed air turbine DC power generator system, comprising: an aerodynamic turbine engine; a direct current generator (2) used for generating a direct current by using power output of the aerodynamic turbine engine as a driving input; and a control unit (3) used for controlling the rotating speed of the aerodynamic turbine engine to generate the power output and adjusting the output current and/or the output voltage of the direct current generator (2). The compressed air turbine DC power generator system is miniaturized and has high integration level, effectively overcomes the disadvantages such as low power density and great vibration noise of a power generation system with an internal combustion engine, and has a high industrial application value. The compressed air turbine DC power generator system can be used as an auxiliary power supply in the development process of an electric automobile, thereby effectively resolving the problem of range anxiety of a pure electric automobile.

Abstract: A method of controlling a power system that includes an electrical machine, e.g., wind turbine generator, a power converter, a DC circuit and a dynamic braking system (DBS) having a braking circuit having a braking resistor and being connected in series to the DC circuit, is provided. The method includes operating the DBS and controlling operation of the electrical machine based on a prevailing temperature of the braking circuit, stopping the electrical machine and controlling the electrical machine to be restarted at its rated output power once the prevailing temperature of the braking resistor reaches or falls below a lower temperature threshold. The electrical machine may be restarted at a lower output power and after restarting, its output power can be increased based on a power starting profile as the braking resistor cools.

Abstract: A method for controlling an electrical distribution network, wherein a network control station is provided to control the electrical distribution network and the electrical distribution network comprises a plurality of balancing areas, wherein each balancing area outputs or receives an exchange power to or from the electrical distribution network, and wherein at least one of the balancing areas has at least one generator, in particular a wind farm, for generating a generator power and additionally at least one consumer for receiving a consumer power, wherein at least one balancing area controller is provided to control the at least one generator or wind farm, and the method comprises the following steps: reception by the balancing area controller from the network control station of a value of an exchange power to be set, wherein the exchange power is defined as a difference between the consumer power and the generator power, drawing up by the balancing area controller of a deployment plan for adherence to or

Abstract: A method for controlling a renewable energy power plant comprising a plurality of wind turbine generators, the method comprising: measuring a voltage level associated with a point of interconnection between a power transmission network and the power plant; calculating a reactive power exchange limit based upon the measured voltage level; and controlling the power plant so that the calculated reactive power exchange limit is not exceeded.

Abstract: A power generation system includes a continuously variable transmission, a power generator, a transmission driving device, an output-side speed detector, and electric power load device, and a controller. The electric power load calculation device detects current values and current values of respective phases of three-phase alternating current generated by the power generator, calculates electric power load of the power generator based on the detected values, and executes filtering by attenuating a higher harmonic of a set frequency when calculating the electric power load of the power generator. The controller executes feedback control of calculating and outputting a gear change command to the transmission driving device so an output-side rotational speed detected by the output-side speed detector becomes equal to an output-side target rotational speed corresponding to the set frequency.

Abstract: An aircraft power generation unit to generate direct current (DC) power includes a flux regulated permanent magnet generator (PMG) that includes first through fourth sets of windings and a control coil and a rectifier section that include first through fourth six pulse rectifiers and a common local output bus. The unit also includes an output bus configured to be connected to the load and an H-bridge circuit connected across the output bus and outputs connected to the control coil. A controller receives an input signal from at least one of the windings and selectively couples either the common local output bus and fourth rectifier to the output bus negative rail and one or more of the first, second and third six-pulse rectifiers to the output bus to provide a constant voltage to the load.

Abstract: A closed system that captures energy derived from the head differential rather than open-water flows velocities while reducing potential environmental damages and costly maintenance due to bio-fouling. This energy density available in a tidal range is increased substantially via convergent “nozzles” to produce an optimal speed for power generations with the turbine sections, thereby significantly increasing the tidal energy captured by this system, even at sites where tidal energy is low (e.g., small to medium tide ranges, such as found along the East and Gulf Coasts of the United States).

Abstract: A method for operating a wind farm connected to a power grid that demands a reactive power requirement that varies with active power includes monitoring a wind speed at each of the plurality of wind turbines in the wind farm. When the wind speed is within a cut-in wind speed range, the method includes determining a reactive power margin of the wind farm based on the reactive power requirement at an active power output corresponding to the wind speed and a reactive power availability of each of the plurality of wind turbines at the wind speed. The method also includes determining a lowest possible cut-in rotor speed for each of the plurality of wind turbines that satisfies the reactive power margin. Further, the method includes commanding each of the plurality of wind turbines to cut-in and begin to produce power at the lowest possible cut-in rotor speed that satisfies the reactive power margin.

Abstract: A submerged wave energy conversion apparatus and pressurized fluid or electricity production system are provided that harvests energy from a motive force derived from pressure differentials created by the interaction of the system with ocean water. The system is capable of capturing energy from up to six different modes of motion of the absorber body in response to the energy of incident waves. The apparatus has an absorber body that is attached to one or more damping mechanisms like a hydraulic cylinder, a hydraulic circuit that can create useful mechanical torque, a restoring mechanism such as an air spring to restore the absorber system to stable equilibrium, and a buoyant artificial floor to create an opposing reaction force. The apparatus may also have a controller for system monitoring and control, to maintain optimized energy extraction, and for load management to avoid damaging loads.

Abstract: A power system includes a synchronous electrical generator having a rotor driven by a shaft; a permanent magnet signaling generator, coupled to the shaft; and an angle computation unit configured to calculate a rotor angle or load angle based on a voltage from the permanent magnet signaling generator and a voltage from the synchronous electrical generator.

Abstract: Processes and apparatus for recovering energy from a petroleum, petrochemical, or chemical process are disclosed. The process comprises providing a fluid process stream in a petroleum, petrochemical, or chemical process zone having a direct current power input; controlling a flow rate of the process stream by directing at least a portion of the process stream through a first power-recovery turbine to generate electric power as direct current therefrom; and providing the recovered direct current to the direct current power input of the process zone.

Abstract: A method and associated system for operating a power generation system to provide real and reactive power to a load includes, with a power converter having switching elements, receiving power from a generator and generating the reactive power within an operating range of generator rotor speed. As the generator rotor speed changes and approaches synchronous speed, a control command is generated to decrease a switching frequency of the switching elements in the power converter from a first switching frequency to a second switching frequency, wherein the reactive power output of the power converter is maintained or increased at the second switching frequency.

Abstract: A control apparatus controls rotating electrical machine which is applied to a vehicle in which an engine is automatically stopped in the case where predetermined automatic stop conditions are satisfied, and, the engine is automatically restarted in the case where predetermined restarting conditions are satisfied, the rotating electrical machine receiving supply of an exciting current from a transistor-chopper type exciting circuit in which a first pair of facing arms of a bridge circuit is configured with power transistors, and a second pair of arms is configured with diodes, and the rotating electrical machine having a power generation function based on rotational force of the engine. The control apparatus executes first grounding control in which, during automatic stop of the engine, among the first pair of arms, the power transistor connected on an earth side of the rotating electrical machine is put into an ON state.

Abstract: A generator has a voltage regulator that includes a first control unit for lowering an output voltage of the generator when a first maximum value is exceeded and a second control unit for lowering the output voltage either when a first maximum value is exceeded or when a second maximum value that is different from the first maximum value is exceeded.

Abstract: An electrical power generation system includes a micro turbo alternator having combustion chamber, a turbine driven by combustion gases from the combustion chamber and a compressor operably connected to the combustion chamber to provide a compressed airflow thereto. A permanent magnet generator is located along a shaft connecting the compressor and turbine such that electrical power is generated via rotation of the shaft, and a cyclonic dirt separator operably connected to a compressor inlet. The cyclonic dirt separator includes an air inlet, and an air exhaust disposed at opposing ends of a housing. The cyclonic dirt separator is configured to induce circumferential rotation into the airflow entering through the air inlet, and separate the airflow into a clean airflow and a relatively dirty airflow, such that the relatively dirty airflow flows through the air exhaust and the clean airflow is directed to the compressor inlet.

Abstract: The present disclosure provides a wind power generation system, which comprises a wind turbine for generating mechanical energy; a generator for converting the mechanical energy into electrical energy; a converter for converting the electrical energy to expected power for supplying to a grid, wherein a rotor of the generator is connected to converter, an output of a stator of the generator and an output of a converter are both connected to the grid; a controller for controlling the converter to absorb rotor-side reactive power Qrotor and to increase line-side reactive power Qline, so as to meet a reactive power demand of the grid, when a rotor speed is less than a predetermined value.

Abstract: Device for converting mechanical energy from sea waves into electric energy including at least a float and two rigid rods. The rods are preferably anchored to the seabed at one end, and to the float at another end. There are also two ballasts that effect their weight towards the sea bed to keep the free ends of the rods constantly in traction and free to rotate around their hinges. The float oscillates up and down along a vertical line due to waves. There are at least two cables that connect the free ends of the rods to a transmission shaft of a generator positioned along the vertical line so that the vertical, horizontal, or rotary oscillatory motion of the float caused by the waves generates an oscillatory motion of the rods which are pivoted on their respective hinges, and thus transfers rotary motion to the transmission shaft of the generator.

Abstract: A damping system includes a flywheel motor device, a generator device, a flywheel power storage device and a power coupler device. When mechanical power generated by the flywheel motor device increases or remains constant, the power coupler device couples the mechanical power generated by the flywheel motor device to the generator device and the flywheel power storage device. When mechanical power generated by the flywheel motor device decreases, the power coupler device couples the mechanical power generated by the flywheel motor device and mechanical power outputted by the flywheel power storage device to the generator device.