Wind Turbine Market Overview 全球风能市场报告.ppt
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1、,Wind Turbine Study,Table of Contents,What is a Wind Turbine?Wind Energy:How it WorksPricingCapital Cost EstimatesInstallation Cost FactorsOperation and Maintenance Cost FactorsArticle:The Economics of Wind Energy(AWEA)Commercialized Wind Turbine ManufacturersMarket Share of Top 10 ManufacturersTop
2、3 ManufacturesVestas Wind Systems A/SOverviewHoovers ReportProduct BrochuresGE WindOverviewHoovers ReportProduct BrochuresEnercon GmbHOverviewHoovers ReportProduct BrochuresWind Energy Projects in OhioRelated Articles10 Steps in Building a Wind FarmWind Power TodayWind Power Myths vs.FactsCompany Pr
3、ofile:BTM Consult ApSWind Energy Resources/Associations,Wind Turbines,Wind power is the process by which wind is harnessed and used to generate electricity.A wind turbine converts kinetic energy(from wind)into mechanical energy.Wind turbines are large,computer-controlled structures with long rotatin
4、g blades.Turbines are mounted on top of tall towers for optimal access to wind.The most common type of wind turbine for producing electricity has a horizontal axis,with two or more aerodynamic blades mounted on the horizontal shaft.With a horizontal-axis machine,the blade tips can travel at several
5、times the wind speed,which results in a high efficiency.The blade shape is designed by using the same aerodynamic theory as for aircraft.Modern wind turbines are now as large as 3 to 5 MW(3,000 to 5,000 KW.),Wind Turbine Diagram,Wind Turbine Components,The nacelle contains the key components of the
6、wind turbine,including the gearbox,and the electrical generator.The rotor blades capture the wind and transfer its power to the rotor hub.The hub of the rotor is attached to the low speed shaft of the wind turbine.The low speed shaft of the wind turbine connects the rotor hub to the gearbox.The shaf
7、t contains pipes for the hydraulics system to enable the aerodynamic brakes to operate.,The gearbox has the low speed shaft to the left.It makes the high speed shaft to the right turn approximately 50 times faster than the low speed shaft.The high speed shaft rotates with approximately 1,500 revolut
8、ions per minute(RPM)and drives the electrical generator.It is equipped with an emergency mechanical disc brake.The electrical generator is usually a so-called induction generator or asynchronous generator.The yaw mechanism uses electrical motors to turn the nacelle with the rotor against the wind.Th
9、e yaw mechanism is operated by the electronic controller which senses the wind direction using the wind vane.,Wind Turbine Components,Wind Turbine Components,The electronic controller contains a computer which continuously monitors the condition of the wind turbine and controls the yaw mechanism.In
10、case of any malfunction,(e.g.overheating of the gearbox or the generator),it automatically stops the wind turbine and calls the turbine operators computer via a telephone modem link.The hydraulics system is used to reset the aerodynamic brakes of the wind turbine.The cooling unit contains an electri
11、c fan which is used to cool the electrical generator.In addition,it contains an oil cooling unit which is used to cool the oil in the gearbox.Some turbines have water-cooled generators.,Wind Turbine Components,The tower of the wind turbine carries the nacelle and the rotor.Generally,it is an advanta
12、ge to have a high tower,since wind speeds increase farther away from the ground.A typical modern 1000 kW turbine will have a tower of 50 to 80 meters(150 to 240 ft.)The anemometer and the wind wane are used to measure the speed and the direction of the wind.The electronic signals from the anemometer
13、 are used by the wind turbines electronic controller to start the wind turbine when the wind speed reaches approximately 5 meters per second(10 knots).The computers stops the wind turbine automatically if the wind speed exceeds 25 meters per second(50 knots)in order to protect the turbine and its su
14、rroundings.,How it works,Wind power is converted to electricity by a wind turbine.In a large-scale wind turbine,the kinetic energy in the wind is converted to rotational motion by the rotor typically a three-bladed assembly at the front of the wind turbine.The rotor turns a shaft which transfers the
15、 motion into the nacelle(the large housing at the top of a wind turbine tower).Inside the nacelle,the slowly rotating shaft enters a gearbox that greatly increases the rotational shaft speed.The high-speed shaft is connected to a generator that converts the rotational movement into electricity at me
16、dium voltage(a few hundred volts.),How it works,The electricity flows down heavy electric cables inside the tower to a transformer,which increases the voltage of the electric power to the distribution voltage(a few thousand volts).Higher voltage electricity flows more easily through electric lines,g
17、enerating less heat and fewer power losses.The distribution-voltage power flows through underground lines to a collection point where the power may be combined with other turbines.In many cases,the electricity is sent to nearby farms,residences and towns where it is used.Otherwise,the distribution-v
18、oltage power is sent to a substation where voltage is increased dramatically to transmission-voltage power(a few hundred thousand volts)and sent through very tall transmission lines to distant cities and factories.,Capital Cost Estimates,Danish Wind Industry Association:$1,000 USD per Kilowatt insta
19、lled(1998)American Wind Energy Association:$1,000 USD per Kilowatt installed(2000)U.S.Government-Energy Information Administration:$1,500 USD per Kilowatt installed(2002)FPL Energy:$1,300-$1,700 per Kilowatt installed(2005),The graph above gives an impression of the price range of modern,Danish grid
20、 connected wind turbines as of February 1998.As you can see prices vary for each generator size.The reasons are varying tower heights,and different rotor diameters.,The Price Banana,Installation Cost Factors,Installation costs vary based on site location and conditionInstallation costs include:Found
21、ationsNormally made of reinforced concreteRoad constructionNeeded to move the turbine and the sections of the tower to the building siteTransformerNeeded to convert the low voltage(690 V)current from the turbine to 10-30 kV current for the local electrical grid,Installation Cost Factors-continued,Te
22、lephone connectionNeeded for remote control and surveillance of the turbineCabling costsTransportation costsGrid reinforcement,if necessary,Operations and Maintenance Cost Factors,Modern wind turbines are designed to work for some 120,000 hours of operation throughout their design lifetime of 20 yea
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