Abstract: When a low voltage event occurs in a utility grid, a load on a spindle system is repressed so that a damage is prevented. A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, and a pitch angle controller for controlling a pitch angle of the wind turbine blade according to a generator speed are provided, and when a voltage of a utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that torsional vibration generated on a spindle system for transmitting the rotation of the rotor to a generator system is repressed.

Abstract: A portable internal combustion engine and a charging device that generates AC power are supported on a manually movable frame. A coupling mechanism which can include a starter circuit and starting device, or a charging circuit and charging device, or both device couples a battery receptacle terminal block to the internal combustion engine. The battery receptacle can include various features to permit and retain electrical coupling between a battery pack for a cordless power tool. For example, key protrusions and corresponding recesses can be associating with latching projections. Additionally or alternatively, cooperating rails and recesses may be associated with the battery pack and receptacle, respectively. Spring loaded movable clips or resilient flexing clips can be included to act on the battery pack. An electrical cord may also be used to couple receptacle terminals to the coupling mechanism.

Abstract: A power generation device for a utility vehicle having a battery source capable of storing electrical energy and selectively outputting electrical energy and selectively receiving electrical energy, a logic/driver module operably coupled to the battery source and capable of outputting power to a drive system of the utility vehicle, an internal combustion engine capable of outputting a mechanical driving force in response to a control input from the logic/driver module, and an AC induction motor operably coupled to the internal combustion engine via a coupler and electrically coupled to the logic/driver module. The AC induction motor is capable of operating as a generator in response to the mechanical driving force of the internal combustion engine, thereby outputting electrical energy to the logic/driver module, and further is capable of operating as an electric motor in response to input of electrical energy from the logic/driver module.

Abstract: A unique, small microturbine engine adapted to integrate with an electrical generator for producing electrical power has been developed. The microturbine includes an ejector cooling scheme, a prevaporizing combustor, and a combustor air bypass. The ejector cooling scheme uses energy in the hot exhaust gas stream of the microturbine to entrain a flow of ambient air that cools the generator. The prevaporizing combustor of the present invention allows liquid fuel to be vaporized in a small amount of air prior to combustion, thereby increasing combustion efficiency and decreasing combustor size requirements. The combustor air bypass allows a fraction of the compressor discharge air to bypass the prevaporizing combustor under certain operating conditions. This permits control of the overall equivalence ratio and the fuel/air mixing process in the combustion zone, improving efficiency and operability.

Abstract: The method according to the invention involves limiting the charging of a vehicle alternator by only authorizing progressive augmentation of a current duty cycle (DC) of an excitation signal (7) of the alternator from an initial duty cycle to an expected duty cycle (EpsU) calculated by a control loop (1, 5, 6) of the alternator. According to the invention, a complementary limitation of the charging of the alternator involves limiting the increase of the current duty cycle (DC) according to at least one parameter of the heat engine involving an angular acceleration (mot) and/or a rotation speed (Nmot) of the heat motor. In particular, this complementary limitation can additionally involve limiting the increase of the current duty cycle (DC) according to a negative value of the angular acceleration (mot).

Abstract: A method for controlling a wind turbine is proposed. The wind turbine is in a wind farm and connected to a point of common coupling that is connected to a utility grid. At least one quantity indicative of a short circuit ratio of the utility grid is measured. A control parameter of a control system controlling the wind turbine and the wind farm is adjusted. based on the measured value of the quantity.

Abstract: In one aspect, a system for operating a power generation system within a battery storage/discharge mode or a dynamic brake mode may generally include a power convertor having a DC link, a switching module coupled to the DC link and a selector switch configured to selectively couple the switching module to one of a storage device or a resistive element of the power generation system. The selector switch may be movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.

Abstract: A system and method for controlling voltage at a point of common coupling of a wind farm including a plurality of wind turbines is provided. The method includes: calculating a first voltage error value, which is a difference between a reference voltage value of the point of common coupling and an actual voltage value of the point of common coupling; calculating a compensation reference voltage value based on the first voltage error value; calculating a second voltage error value by subtracting a voltage value of an output terminal of a wind turbine from a sum of a reference voltage value of the wind turbine and the compensation reference voltage value; calculating a reactive power compensation value corresponding to the second voltage error value; and injecting a reactive current corresponding to the reactive current compensation value into a power grid.

Abstract: A method for reactive power generation for a wind turbine generator includes receiving a voltage command signal, and adjusting this voltage command signal as a function of the wind turbine reactive power. A reactive current is determined for the wind turbine generator in response to the adjusted voltage command signal and is transmitted to a controller of the wind turbine generator for generating a real and reactive power based on the reactive current command.

Abstract: An energy harvesting system for converting mechanical energy into electrical energy uses an electrostatic arrangement based upon the interaction between conductive microfluidic droplets and dielectric-coated electrodes in combination with an electromagnetic arrangement based upon the interaction between magnetic elements and coils, with the two arrangements disposed in an interleaved configuration that provides a degree of synergy to the overall system in the form of providing spacings between adjacent elements and providing a bias voltage source for the electrostatic arrangement from the energy created by the electromagnetic arrangement.

Abstract: A wind-power generator control system is provided. The wind-power generator control system includes a wind turbine, a power generator, a normally closed relay, and a control unit. The wind-power generator has a first output terminal and a second output terminal, and outputs a power output via the first and second output terminal when the wind turbine rotates. The normally closed relay is connected between the first and second output terminals. The control unit transmits a control signal to the normally closed relay by grid power. Also, when the normally closed relay does not receive the control signal, the first output terminal short-circuits the second output terminal by the normally closed relay for protecting the wind-power generator. When the normally closed relay receives the control signal, the first output terminal open-circuits the second output terminal by the normally closed relay for providing the power output.

Abstract: Disclosed is a starter for starting an engine. The starter includes a starter main body, a main electromagnetic switch, and an auxiliary electromagnetic switch. The starter main body includes a motor that generates torque upon being supplied with electric power. The main electromagnetic switch is provided for selectively opening and closing an electric circuit for supplying electric power from a battery to the motor. The auxiliary electromagnetic switch is provided for selectively switching the electric circuit between a high-resistance path and a low-resistance path. The starter is characterized in that the auxiliary electromagnetic switch is fixed to a fixture, and the fixture is fixed to only one of the starter main body and the main electromagnetic switch.

Abstract: A pitch control system for a wind turbine is disclosed. The pitch control system may generally include a motor having an armature and a winding and a grid power source configured to supply electrical power to the motor. The pitch control system may also include a plurality of switching components configured to control a first current through the armature independent of a second current through the winding. In addition, the pitch control system may include an auxiliary switching component electrically coupled between the grid power source and at least a portion of the switching components. The auxiliary switching component may be configured to be opened when a grid voltage of the grid power source exceeds a first voltage threshold.

Abstract: A method of controlling a generator (110) of an electric drive (104) associated with an engine (102) is provided. The method may determine an operational state of the electric drive (104) based on a speed of the engine (102), and selectively engage one of a map-lookup control scheme (150) and a fixed-theta off control scheme (152) for operating the generator (110) based on the operational state of the electric drive (104).

Abstract: A method is provided for controlling power flow within a wind park system for power transmission to a main power grid, the wind park system including two or more parallel-connected island wind park grids. The method includes the steps of: controlling a first voltage source converter as a swing bus in frequency control, the frequency control including controlling frequency to a steady state reference operating point for operating points within a power dead band and by frequency droop control when exceeding an end point of the power dead band, and controlling at least a second voltage source converter in power control, the power control including controlling power flow to a steady state reference operating point for operating points within a frequency dead band and by power droop control when exceeding an end point of the frequency dead band. A controller and computer program product are also provided.

Abstract: A device for energy recovery for a large diesel engine includes a current generator for converting mechanical rotational energy into electric energy. The current generator includes input shaft for applying rotational energy; a steam turbine a first shaft for transmitting the rotational energy of the steam turbine to the input shaft of the current generator a power turbine and a second shaft for transmitting the rotational energy of the power turbine to the input shaft of the current generator, wherein the first shaft and the second shaft are coupled with the input shaft of the current generator. A first coupling device between the current generator and the steam turbine couples the input shaft of the current generator and the first shaft and/or a second coupling device between the current generator and the power turbine couples the input shaft of the current generator and the second shaft are provided.

Abstract: A hydrokinetic generator apparatus that includes a liquid reservoir having an outlet port and an inlet port that is disposed over the outlet port; an outflow valve that is disposed at the outlet port of the liquid reservoir; at least one generator module coupled from the liquid reservoir and including at least one fill pipe for receiving liquid expelled from the liquid reservoir, and at least one outlet port; at least one surge generator disposed in the fill pipe; and an outflow valve at a base of the generator module. The outlet port of the generator module is coupled to the inlet port of the liquid reservoir. The apparatus further includes a battery pack; an electrical controller responsive to a voltage across the battery pack for controlling said valves; and an electrical charging hub responsive to the surge generator for re-charging the battery pack.

Abstract: A vehicle includes a mobile electric power generation system including a mobile power source such as a generator. An external power interface is included to connect to an external electrical power source. An AC electric power distribution bus is included to power electric loads of the vehicle and a power switch device is provided to selectively provide AC electric power on the power distribution bus from one of the respective power sources with a default to select one of the sources whenever it is present.

Abstract: An electrical supply device includes a set of armature coils which are coupled together in a polygonal mode. The coils are connected to a single bridge rectifier which includes a set of controllable elements allowing switching between a first operating mode in which some of the coils are electrically connected in series and a second operating mode in which all of the coils are electrically connected in parallel. An alternator for a motor vehicle includes the disclosed supply device.

Abstract: A system to harvest energy in a wellbore is disclosed. The system includes a flexible member disposed in a wellbore. The flexible member includes at least a portion of a drill string. The system includes an energy harvesting apparatus that includes magnetostrictive material and a conductor coupled to the magnetostrictive material. The energy harvesting apparatus is coupled to the flexible member to transfer forces from the flexible member to impart at least one of a strain or stress in the magnetostrictive material and to induce an electrical current in the conductor.