Abstract: A hydrokinetic energy conversion system (HKECS) is provided, comprising design configurations suitable for efficient production of tidal or river in-stream kinetic energy into useful mechanical energy for tasks such as generating electricity or water pumping. The apparatus includes a set of blades with an airfoil cross sectional contour moving on a horizontal or vertical closed loop track, whereby the blades are propelled through the water by a net tangential lift force, rather than drag, to effectively convert the kinetic energy of flowing water to useful power.

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: First and second opposing ends are formed in a magnetic path forming member on which a power generation coil is wound. A rotating body has a permanent magnet, a first magnetization member and a second magnetization member. When an operating force does not act on an operating member, an end surface of the first magnetization member is opposed to the first opposing end via a gap and an end surface of the second magnetization member is opposed to the second opposing end via a gap. When the operating member is pressed, the rotating body rotates and when the force to the operating member is released, the operating member and the rotating body return. Since the rotating body and the magnetic path forming member do not come into contact with each other, the force required to operate the operating member is relatively weak and large electromotive force can be obtained.

Abstract: Provided is a 3D active intelligent-type high-performance wind turbine generator. The 3D active intelligent-type high-performance wind turbine generator may be driven in horizontal/vertical axis directions. This novel wind turbine generator includes blades for driving a generator shaft of which cross sections are arranged symmetrically to increase the efficiency of the wind turbine generator and a cylindrical type cam and cam follower for controlling the angle of each blade in every direction to an optimum condition, so as to guide a working fluid having kinetic energy to be introduced at right angles to the direction of the cross section of each blade, thereby maximizing the driving force of the blades. Thus, the wind turbine generator may operate satisfactorily even at a low initial start-up wind speed and may be driven in any horizontal/vertical axis directions.

Abstract: When electric power exceeding output allowable power at an engine startup time is output from a power storage device, deviated from a predetermined period of time during which the output allowable power of the power storage device is switched, an ECU suppresses increase of the output allowable power for the next startup time of the engine. Specifically, the ECU modifies the output allowable power for the next startup time of the engine from a first value to a second value lower than the first value, based on a period of time before deviation is eliminated.

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 solar wind chime includes a chime and a striker suspended from a body. A solar energy system is carried by the body and includes a solar energy collection system configured to recharge a rechargeable electrical power source. An electrical subsystem conductively couples to the rechargeable electrical power source.

Abstract: A wind power installation is provided having a pylon made up of a plurality of pylon segments, a generator arranged in the region of the head of the pylon, a power module arranged in the region of the pylon base or separate from the pylon, busbar elements which are installed segmented in the associated pylon segments for current transfer from the generator to the power module, and connecting elements for connecting busbar elements which are installed in adjacent pylon segments. Clamping holders may be mounted to the inside wall in the end region, that is the lower end region in the erected condition, of the pylon segments with end portions of the busbar elements clamped or inserted into the clamping holders.

Abstract: A downhole tool for generating power is provided that includes a conductive fluid disposed downhole within a tubular member, an energy harvesting apparatus, and a pressure changing apparatus. The energy harvesting apparatus includes a magnet configured to generate a magnetic field and an electrical conductor configured to move with respect to the magnet. The pressure changing apparatus is configured to supply a differential pressure across the energy harvesting apparatus, such that the electrical conductor moves with respect to the magnet.

Abstract: The present disclosure relates to a method for controlling a wind turbine of the type including a rotor, a generator, a frequency converter, a control unit and means for connecting to a wind farm grid, using means for receiving a local voltage reference value (VREF) and a regulator (1) which calculates the reactive power to be generated (QT) as a function of the voltage error (?V), such that it can be operated over the entire voltage range. The system also includes: at least one saturator element (2, 6, 7) in which the reactive power to be generated is limited, whereby the limits (Q—MAX, Q—MIN, QC—MAX, QC—MIN, QS—MAX, QS—MIN) are calculated dynamically as a function of the voltage, this block outputting a reference reactive power of the wind turbine (Q—REF, QC—REF, Qs—REF); and an element (3) for calculating the actual limit of the active power (PMAX) as a function of the pre-limited reactive power (Q—REF, Qs—REF) and the apparent power available at that moment.

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 method for regulating the reactive power generated or absorbed by a synchronous electric generator includes regulating a quantity of coils disposed in line with a stator winding. Additionally, a generator operating point of the generator is regulated.

Abstract: A scalable portable modular power plant that includes an electrical substation module containing a substation container with a first transformer and a second transformer positioned at the first and second ends of the substation container, and a plurality of containerized electric generator modules each positioned relative to a corner of the substation module, where each electric generator module is connected to one of the two transformers.

Abstract: Disclosed are methods, systems and apparatuses for harvesting vibrational energy from vehicles, as well as methods for locating vibrational energy on a vehicle. One harvesting apparatus comprises a vibrational energy harvester coupled to a substantially maximal vibrational displacement node of the structural element of a vehicle, and tuned to a frequency of vibration of the maximal vibrational displacement node. The harvester may be one of a variety of harvesting devices, such as piezoelectric devices. Methods are also provided to locate structural elements which are appropriate for vibrational energy harvesting.

Abstract: There are a large number of sites in the world's oceans and rivers that can provide a significant, viable, and cost effective source of renewable energy. Many are strategically located close to populated areas where these sites can be used to harness energy using ecologically benign hydrodynamic technology. A hydrodynamic array comprises multiple hydrodynamic elements for producing electricity by the motion of ocean tides or river currents and forces acting on the hydrodynamic array, which is immersed in ocean tides or river currents and which is in motion relative to the ocean tides or river currents.

Abstract: A method comprises the transmission to a regulator (8) of the alternator of width-modulated pulses (PWM1) exhibiting a duty ratio representative of a setpoint value (Vref) continuously included between a first reference duty ratio (DC1) and a second reference duty ratio (DC2), and the detection of these pulses by the regulator so as to generate the setpoint value. The method also comprises the transmission to the regulator of other width-modulated pulses (PWM2) exhibiting a specific duty ratio (EXOF_R) which is less than the first reference duty ratio (DC1) and ties between a low duty ratio (DCL) and a high duty ratio (DCH), and the detection of these other pulses by the regulator, in a first step, and the generation of an opening signal (EXOF) for a circuit for excitation of the alternator, in a second step, following this latter detection.

Abstract: A scalable portable modular power plant that includes an electrical substation module containing a substation container with a first transformer and a second transformer positioned at the first and second ends of the substation container, and a plurality of containerized electric generator modules each positioned relative to a corner of the substation module, where each electric generator module is connected to one of the two transformers.

Abstract: A power supply apparatus capable of setting a ripple current to be not more than an acceptable value regardless of an input voltage is obtained. The apparatus calculates switching frequency by a current detected by a current detector so that the switching frequency is set to be low if the current is large and the switching frequency is set to be high if the current is small. The switching frequency is set to be high if the input voltage is high and switching frequency is set to be low if the input voltage is low depending on a voltage inputted to an input terminal; and a switching element is controlled by restricting the switching frequency so that the switching frequency to be set by the current detected by the current detector is not lower than the switching frequency to be set by the input voltage.

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: Moving fluid energy conversion device (90) converts mechanical energy contained in moving fluid (16) to electrical energy. Moving fluid energy conversion device (90) comprises one or more transducers (10), a charge exchange means (600), a charge element (62) and a recovery element (65). Transducer (10) is comprised of one or polymer spacers (502) sandwiched between one or more top electrodes (504) and bottom electrode (506) pairs. Moving fluid energy conversion device (90) produces electrical energy by transferring electric charge from charge element (62), through charge exchange means (600) to transducer (10) in stretched state (6). Transducer (10) is then allowed to return to relaxed state (8). The charge in transducer (10) increases in energy when the transducer (10) returns to relaxed state (8). The increased energy electric charge flows to recovery element (65) through charge exchange means (600).