Abstract: The degrees-of-freedom associated with offshore floating wind turbines (OFWTs) result in a more dynamic flow field. The resulting aerodynamic loads may be significantly influenced by these motions via perturbations in the evolving wake. This is of great interest in terms of OFWT design, placement and simulation. This study presents free vortex wake method (FVM) simulations of the NREL 5-MW wind turbine of a variety of platforms, operating in a range of wind speeds synthesized platform motion time series. Motion-induced wake perturbations are observed to affect induction. Transitions between windmill and propeller states are also observed.

Abstract: In this work a hierarchical scheme is proposed for the coordinated control of conventional synchronous generators, wind farm converters and flexible ac transmission systems. It comprises two levels, namely a fully decentralized set of controllers associated with the involved devices and a centralized coordinating controller based on synchronized wide-area signals provided by phasor measurement units. The proposed hierarchy of controllers is mainly focused on two objectives: transient frequency support and inter-area oscillations damping. Several works have recently proved that the fast-acting power converters of variable-speed generators can greatly improve the short-term frequency regulation capability in scenarios with a large penetration of wind energy. A case study is included showing that the dynamic performance and stability of power systems can indeed be enhanced when windmill converters are properly coordinated via a wide-area centralized controller.

Abstract: A piezocomposite generating element (PCGE) can be used to convert ambient vibrations into electrical energy that can be stored and used to power other devices. This paper introduces a design of a magnetic force exciter for a small-scale windmill that vibrates a PCGE to convert wind energy into electrical energy. A small-scale windmill was designed to be sensitive to low-speed wind in urban regions for the purpose of collecting wind energy. The magnetic force exciter consists of exciting magnets attached to the device?s input rotor and a secondary magnet fixed at the tip of the PCGE. The PCGE is fixed to a clamp that can be adjusted to slide on the windmill?s frame in order to change the gap between exciting and secondary magnets. Under an applied wind force, the input rotor rotates to create a magnetic force interaction that excites the PCGE. The deformation of the PCGE enables it to generate electric power. Experiments were performed with different numbers of exciting magnets and different gaps between the exciting and secondary magnets to determine the optimal configuration for generating the peak voltage and harvesting the maximum wind energy for the same range of wind speeds. In a battery-charging test, the charging time for a 40?mA?h battery was approximately 3?h for natural wind in an urban region. The experimental results show that the prototype can harvest energy in urban regions with low wind speeds and convert the wasted wind energy into electricity for city use.

Abstract: Wind energy, a kind of renewable and clean energy, is widely studied nowadays. Directly driven wind turbine permanent magnet synchronous generator (D-PMSG) plays an important role in the modern wind generating systems. A reliable and speedy simulation of the wind directly driven permanent-magnet synchronous generator is significant. By replacing the power electronic device with math equivalence, it established the windmill model, PMSG model, control model, voltage source converter (VSC) model, dc-line model, filter model and grid model in this paper. It achieved a simulation in Simulink of Matlab. This simulation model could fix the aim of maximum wind energy tracking, active power and reactive power independent control and variable speed constant frequency operation. With the influence of wind speed changing and short circuit occurring, the simulation results show the availability of the control strategies and research.

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes a windmill pump driven by a spool.

Abstract: This paper presents the experimental results of variable speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG). The back to back PWM converters are utilized as converters for the VSWPGS. The experimental results are obtained by the test bench using the wind turbine emulator. The wind turbine emulator are reproduced the behaviors of windmill by the servo motor drives. The mechanical torque reference to derive the servo motor is calculated from windmill wing profile, the wind velocity and windmill rotational speed. The VSWPGS using PMSG employs the vector control system to control the torque and speed of PMSG in the converter side. The windmill rotational speed is controlled to maximize the efficiency of wind turbine against wind speed in low-and middle-range. When the wind speeds exceeds the rated value, the windmill rotational speed and output power are controlled to be the rated values by the pitch angle control system. And the active power and reactive power are controlled in the inverter side, and generated power is sent to the grid-connected power generation while controlling the DC link voltage to be constant at the same time.

Abstract: Wind power is of increasing interest in society due to its prospects as an environmentally friendly source of renewable energy. The use of wind turbines to extract electrical energy from wind can be dated back to the late-1800s, with the 12 kW windmill generator by Charles Brush, as well as the mid-1900s, with the 1250 kW Smith-Putnam wind turbine. Developments in the wind industry were encouraged by the oil crisis in 1973.

Abstract: PURPOSE: A wind power generating plant of a vehicle is provided to collect energy by including a windmill room inside a wind tunnel of a duct which is installed on the roof of the vehicle. CONSTITUTION: An internal wind tunnel of a duct(1) of a rectangular shape is installed on the roof of a vehicle. A plurality of windmill rooms which is bent as semi-cylinder type is placed in the internal wind tunnel. A windmill for driving a micro-electric generator is horizontally installed on right and left side plates in the plurality of windmill rooms. A generator(4) is placed in one generator room of the duct. The generator is connected to a storage battery(V) of the vehicle which can be electrically charged.

Abstract: PURPOSE: A hot water heating apparatus using both wind power and solar heat is provided to generate hot water even in case wind strength is weak while vertical and horizontal windmill blades are utilized according to thermal capacity of a heating system. CONSTITUTION: A hot water heating apparatus using both wind power and solar heat comprises a windmill(10), a set-up gear(20), a hot water generator(30), a supplement water tank(40), a hot water storage tank(50), and a solar collector(60). The windmill generates torque by converting wind power into mechanical power. The set-up gear increases the torque of the windmill. The hot water generator generates hot water by making friction heat with fluids using increased torque. The supplement water tank supplies the fluids to the hot water generator. The hot water storage tank circulates the hot water to a heating facility(4) through a hot water supply pump(1), a hot water supply pipe(2), a returned water pipe(3). The solar collector is connected to the hot water generator, the supplement water tank, and the hot water storage tank, and generates the hot water using solar energy.

Abstract: The invention relates to a passive gas jet method and a device for improving performances of a vertical axis wind turbine. When natural wind enters an inlet duct always installed facing the downwind direction, passes through a hollow steadying bar and is sprayed out of an air exhausting device installed at the external end or a thrust nozzle of a blade at the opposite direction to the rotation ofa windmill, extra force moment for pushing the windmill to rotate is generated completely without any extra power consumption. The method not only obviously improves the output efficiency of windmillbut also reduces the starting wind velocity and enlarges the operating range, thereby obviously reducing the generating cost. The invention belongs to the fields of windmill design, manufacture and application.

Abstract: The invention discloses a wind-driven windmill aerator, which relates to water purifying wind-driven aerating equipment and belongs to the technical field of aquiculture aeration. A wind-driven mechanism, a weathercock and fan blades constitute a power part; designs of air amount control, wind direction start/stop and the like can be provided; and a power part is used for driving left and right water mill wheels to rotate normally, is arranged above and below an underwater platform, and is driven by the left and right water mill wheels to overturn a water body for aerating and increasing dissolved oxygen.

Abstract: The utility model relates to the field of a wind power technology, and in particular relates to a multi-zone and multi-unit oriented off-grid small wind power station monitoring system based on the Internet of things and a cloud computing technology in the field of the monitoring technology of an off-grid small wind power station. The system comprises a wind generating set, a wireless sensor network, a hub, an IPC (industrial personal computer), a server and a client, wherein the wind generating set comprises a windmill main body, a pole and a control power supply system; the windmill main body comprises a wind wheel, a generator, a revolution body and a vibration damper; the control power supply system comprises a brake controller, a fan controller, a storage battery, an inverter and an unloading box; the windmill main body is mounted on the outdoor pole; the control power supply system, the hub and the IPC are mounted in a control room; the generator of the wind generating set and the storage battery are connected with the fan controller through a cable respectively; and a voltage sensor and a current sensor are mounted in the fan controller.

Abstract: The invention relates to a composite rotor structure variable-speed constant-frequency wind power generator system and a control method thereof, which belong to the technical field of the wind power generator, and solves the problems of the direct-driven wind power generating system such as large size and high cost because an alternative-current-direct-current-alternative-current variable-frequency link is increased between the power generator and an electric network. The composite rotor structure variable-sped constant-frequency wind power generator system comprises a windmill, and also comprises a gear transmission mechanism, a main generator, an auxiliary generator and a frequency converter, wherein the windmill is respectively connected with an input shaft of the main generator and an input shaft of the auxiliary generator, the electric signal output end of the auxiliary generator is connected with the electric signal input end of the frequency converter, and the signal output end of the frequency converter is used as an input end of the electric network; and the electric signal output end of the main generator is used as an input end of the electric network, the main generator and the auxiliary generator are coaxially arranged, a stator of the main generator and a stator of the auxiliary generator are fixed on a shell, and the transmission ratio range of the gear transmission mechanism is 2.8 to 23. The composite rotor structure variable-speed constant-frequency wind power generator system is suitable for a wind power generating system.

Abstract: PURPOSE: A structure of a windmill for a wind power generator and a power transmission method are provided to maximize power generation efficiency by transferring a large amount of mechanical rotation power to a gear box CONSTITUTION: A structure of a windmill for a wind power generator comprises two or more blades(42) and a ring gear(43) The blades are installed around a hub(40) at equal angles and convert the kinetic energy of wind or water into mechanical rotation power The ring gear is welded to the ends of the blades The maximum mechanical rotation power is transferred to a generator through the ring gear

Abstract: The utility model discloses a wind driven generator with windmills, which is characterized by comprising windmill impellers, a wind tunnel, power generators, transmission mechanisms and wind screens, wherein each windmill impeller consists of a main shaft and blades; the blade is a rectangular plate; and the wind screens are arranged at the upper half parts of the windmill impellers. The wind driven generator disclosed by the utility model has the advantages that due to the arrangement of the windmill impellers and the wind screens, the rotating directions of the windmill impellers are the same as the wind direction; and the structure is simple, and when the wind speed is high, the wind driven generator can also be used.

Abstract: PROBLEM TO BE SOLVED: To provide a private power generator reducing wind power loss and capable of efficiently generating electric power, since the structure of a windmill mostly functions nearly as the structure of the power generatorSOLUTION: A wind power generator is configured in such a manner that a drag type windmill and a magnet for power generation are mounted on the upper part of a reversed U-shape frame, and an electric appliance casing is mounted on the lower part of the frame; magnetic poles of the magnet are vertically arranged along the frame on both sides of the windmill; the windmill includes a plurality of pairs of blades vertically arranged around a rotor shaft that integrally rotates; each blade is provided with an electromotive unit comprising a middle of a coil wound on a core material; and a current collecting device is mounted on the rotor shaft in the casing, in which both ends of the coil are connected and both ends of each pair of the electromotive units are connected; and thereby, electric power is obtained via the current collecting device A solar power generator is configured by sticking solar panels to each blade and to the top plate of the windmill, and electric power generated by the wind power generator and by the solar power generator is charged into a secondary battery

Abstract: The utilization of Renewable Energies plays the pivotal role in the environmental protection in the contemporary age, so that many countries have given the priority to such energies in their national programs, seeking the efficient methods or strategies to achieve such ambition. The study shows that the issue has been considered in Iran Plateau from the early ages. The recognition of windmills utilization experience in the eastern region of Iran and especially the southern part of Khorasan province and Sistan shows that the use of wind energy has been adapted with the daily needs of residents. Regarding the wind power transmission mechanism in the studied local windmills known as Asbad, a same mechanism in all three types of Asbads is recognizable. Based on the study main achievement, such a power transmission mechanism can be applied in the contemporary age even in other countries to replace the energies derived from the fossil fuels with the wind energy as a Renewable and Eco-friend Energy.

Abstract: A nonlinear piezoelectric wind energy harvester is proposed which has a low startup wind speed and is not restricted to a specific wind speed. By using the piezoelectric transduction mechanism, the gearbox is eliminated from the system and the start up speed is improved. Permanent magnets are placed in the blade part of the windmill. The interactions between the rotating magnets, positioned on the blades, and the tip magnets mounted on the piezoelectric beams directly and parametrically excite the beams. The nonlinear magnetic force makes the vibrations of the beams nonlinear and can make the beams bi-stable. This phenomenon is utilized to enhance the power output and to improve the robustness of the power production. Two designs are presented which incorporate parametric and ordinary excitations to generate electric power. The performance of each design is examined through experimental investigations. An analytic model is developed which is verified by the experimental results and explains the nonlinear phenomena captured by the experimental investigations.

Abstract: The present invention has for object to show how to realize a machine allowing to transform fluid energies into mechanical energy, or conversely, mechanical energy in fluid energy, this machine being able to be used as windmill, in air or in water, as vacuum cleaner, in air or in water, as propeller, as pump, in air or in water, this machine having the capacity to produce or to receive some energy, with a volume of much lower the one that one realizes at present with windmill, or conventional pumps, or other hatch current. The present invention will show afterward supplementary versions of the energy windmill, notably by showing various capacities of pales, capable of realizing energy windmill in their version engines, either in their version compressive, or in other words in their version condensatrice or expansive, additional modes of entrance and exit of fluids, notably outside towards the centre, or still by highly-rated rectilinear towards highly-rated hooked, supplementary combinations allowing to realize them in a staged way, and to produce jet turbines or turbines of expansion, various modes of supports of pales, various additional applications, as vacuum cleaner, ventilator, propeller, pump, jet turbine turbines of expansion

Abstract: Now a days the requirement for renewable energy power production is increasing due to scarcity of conventional energy resources. So, one of the best renewable energy resource for production of electrical energy is wind. As most of the loads are lagging loads, losses will be more due to low power factor. In our study even though capacitor bank is connected to compensate reactive power, and to maintain voltage stability, it is observed that there is no constant required power factor at all loads. Due to connection of capacitor in steps using capacitor bank, there is over compensation. In this paper "Thyristor switched Capacitor"is proposed to improve power factor in windmill power plant. The expected results were obtained by using MATLAB soft ware tool. The data is collected from Wind mill power plant maintained by DECCAN CEMENTS LTD. located at ramagiri, Anantapur (Dist), Andhra Pradesh, India.

Abstract: [Problem] The present invention provides a radio tower which, even when set up in a location where it is difficult to transmit electricity from a commercial power source, or when there is a power failure or a disaster, etc., utilizes renewable energy comprising wind power and solar power to generate electricity, and stably ensures that radio waves are sent and received by the antenna of a base station for mobile phones or a base station for disaster prevention radio communications, etc. [Solution] This radio tower (120) comprises a vertically-disposed support tower, a power supply device that utilizes renewable energy, and a control device (220). The vertically-disposed support tower is formed by vertically stacking, in five levels, three-dimensional frames that exhibit a triangular shape in a plan view, and that have an assembled structure involving three vertical support columns (122) and a coupling frame section comprising a bottom frame section (131) and a top frame section (132). Some of the frames serve as antenna installation sections in which an antenna (201) for sending and receiving radio waves is disposed. The power supply device that utilizes renewable energy comprises: vertical-axis-vertical-blade-type windmills (112) that are individually incorporated in each frame constituting the support tower, and that are rotated by wind power; wind power generators (111), each of which is equipped with a dynamo (G1) that generate power via the torque of the windmill (112); and solar power generators (120) that are individually incorporated in the frames, and that generate power via sunlight. The control device (220) controls the operation of the wind power generators (111) and the solar power generators (120), and controls the sending and receiving of radio waves by the antenna (201) by utilizing the power output by the dynamos (G1) and the solar power generators (120).

Abstract: A stand-alone wind power generation system and a method for controlling an excitation synchronous generator thereof are provided. In this method, an input wind power is transformed into an electrical power and outputted to a load. With the use of a coaxial configuration, a windmill, a speed-increasing gearbox, the excitation synchronous generator, and a motor are integrated in the same shaft. The output voltage of the generator is stabilized by an excitation field control. With the use of a motor servo control, the speed of generator can be stabilized under a wind disturbance condition. Therefore, the output power and frequency can be stable. A power flow management unit can control battery sets to charge and discharge, so as to accomplish the proposed control method.

Abstract: The utility model relates to a wind power generation street lamp, which comprises a pole body and lamps which are arranged on the upper part of the pole body, and has the innovation points that: the top end of the pole body is provided with a shell; the front end of the shell is provided with a blade; a generator is arranged in the shell; the generator is connected with the blade through a gear box; an output end of the generator is connected with a voltage input end of a storage battery which is built in the pole body; and a voltage output end of the storage battery is connected with the lamps. The blade is driven to rotate by using wind energy; the generator is driven by the rotating blade to rotate to generate power; the power is rectified by a charger to charge the storage battery; then the power is supplied to the lamps by the storage battery for lighting; and thus, environmental friendliness and no pollution are guaranteed, and meanwhile, the windmill street lamp has the effect of beautifying the environment while lighting.

Abstract: The invention discloses a vertical shaft wind scoop type universal windmill which consists of a base (1), a support frame (2), a vertical shaft rod (3) and a power output device (4) and is characterized in that a plurality of arc-shaped blades (5) are arranged between an upper plug cover (6) and a lower plug cover (7) at equal intervals along the same direction and correspondingly form a plurality of wind scoops (8) with the upper plug cover (6) and the lower plug cover (7); and the wind scoops (8) are windward and do work under stress. Compared with the prior art, the vertical shaft wind scoop type universal windmill has the advantage that as an S-shaped blade group and a manufacturing method of the upper plug cover and the lower plug cover are adopted, the ox horn-shaped sealing wind scoops can be formed, so that the wind force is pressed into the wind scoops to generate an pressure-boosting effect, and then the vertical shaft rod (3) is pushed to rotate and do work through the pressure-boosting effect generated by the wind scoops, therefore, the utilization efficiency of wind energy can be greatly improved. The vertical shaft wind scoop type universal windmill not only can be widely applied to various wind power generation equipment, but also can be used for the productivity of a liquid transfer elastic rotor engine and can also be widely used on a larger-scale ship and other vehicles as power.

Abstract: A floating-body type wind power generation device equipped with a floating body, which floats on the surface of water, and a windmill, which is installed on the floating body and at least a portion of which is submersible, said floating-body type wind power generation device being characterized in that the windmill includes at least one blade, a hub attached to the blade, a tower erected on the floating body, a nacelle provide on the tower, a first electrical device provided in the hub or the nacelle, and a second electrical device connected to the first electrical device via a cable, and in that the second electrical device is constructed so as to be capable of relative movement in a direction perpendicular to the tower when the windmill is submerged, so that the second electrical device is not submerged.

Abstract: The utility model relates to a power station, in particular to a generation device for a solar energy/wind energy rotating tower. The generation device comprises a tower base, wherein the tower base is internally provided with a storage battery and an electric control device, a tower head is fixedly arranged on the tower base by a tower column, and a windmill or/and a solar energy photovoltaic panel is/are fixedly arranged on the tower head, the windmill or/and the solar energy photovoltaic panel is/are connected with an electric generator on the tower base by an electric energy transducer of the electric control device, and the electric generator is further provided with an accelerator. The generation device for the solar energy/wind energy rotating tower is free from pollution, free from fuel, and capable of circularly generating electricity; and the investment cost can be reduced, and the generation device is prominent in electricity saving effect.

Abstract: Windmill, machine that converts wind into useful energy. This energy is derived from the force of wind acting on oblique blades or sails that radiate from a shaft. The turning shaft may be connected to machinery used to generate electricity. The present paper makes an attempt to show the effect of wind and earthquake load on tubular type windmill and its foundation considering hard, medium and soft soil strata. The modeling of windmill tower was done in computer software by finite element modeling technique. In that windmill tower was subjected to wind and earthquake forces and check bending stresses, mode Shape, base shear comparison, stability, safety of windmill for hard, medium and soft strata. Also check stability, safety of windmill foundation and design of reinforcement required in the foundation for hard, medium and soft strata. Based on the analytical investigation and design it has been concluded that the effect of wind on windmill is significant as compare to earthquake, hence stability of windmill is thoroughly check for this load. Soil strata also play a major role in deciding its safety and stability. The normalized base shear, seismic moments, natural time period, bending stresses in tower and sizes and reinforcement of foundation increases from hard strata to soft strata.