Wind power generation technology originated in Europe, the global wind power market from on ninety time begin the century with an average annual growth rate of over 30% high speed development, in 2000 with the European market is saturated with each passing day and slightly down. After 2005, the global wind power market is entered new round development summit. According to the forecast, in 2020 the world's wind power installed capacity will reach 1231000000 kilowatts, annual wind power will account for 12% of the world's power supply. According to calculating, this means that 20% of the average growth rate of main impetus, from Asia and the americas.

In the recently held the world wind energy association the first World Conference on wind power, the wind power industry development present situation and the major problems encountered and simultaneously pointed out: the next 20 years, the world wind power industry development leading and dominant in china. Take the wind forecast, early warning mechanism and automatic monitoring and protection measures of wind power generator, a safe and stable operation of the key: large-scale, ocean has become the future trend of development of world wind power.

Wind power equipment manufacturing technology is the set of air dynamics, mechanics of materials, process science, meteorology, motor learning, brake control, power transmission, protection and control of multi-disciplinary integrated technology. Wind power equipment design life is in commonly 25～ 30 years, subjected to wind, sun, rain, thunder, ice, salt corrosion and all-weather test. Japan wind power equipment because of the typhoon, thunderstorm destroyed accidents have occurred, almost every year. The world famous Danish firm has disposable replaceable 80 wind turbine gear box, huge losses. There is another international scale manufacturers, because of a certain component damage, compensation for purchase after the loss on the verge of bankruptcy. A marine wind electric multiple units appear motor failure technical failures, to replace the fan and transported to the land repair, supplier undertakes to disassembly and assembly costs amounted to more than 40000000 euros. All of these domestic and foreign experience, China's wind power in the development of effective measures must be taken to -- wind forecast, early warning and braking control, in order to ensure the safe and reliable operation of the wind turbine.

The 1 international wind power development general situation

By the European Wind Energy Association ( EWEA ) and the United States, Canada, Australia, India, China, Japan and the five continents of the world wind energy association composed of international organizations -- the global wind energy GWEC ( Global Wind Energy Council ) held the first meeting from all over the world, including more than 1500 enterprises, organizations and research institutions etc, covers more than 7000 manufacturers of wind power equipment 99% or more.

Now the global wind power equipment over 80000 sets, the wind power industry with annual 25% ～the growth rate of more than 30% development, since 1990 15 years increased by 15 ( Europe is 20 times more than ). But the overall performance of wind power development is not balanced, the United States, Germany, Spain, Denmark, India, the fastest development, the 5 country's wind capacity about 80% of the global total above.

In wind power equipment manufacturing, the first, 38%, second in Germany, 20% in Spain, third, 17%. The 3 China production equipment accounted for about more than 75% of the total global. Global top 10 countries wind power capacity ( KW ) and the ratio profiles are as follows: 1663 German, 35.2%; Spanish 826, USA 17.5%; 674, 14.3%; Denmark 312, 6.6%; India 300, 6.3%; Italy 113, 2.4%; Holland 108, 2.3%; 89, 1.9%; 83, 1.7%; China 76, 1.6%.

National development is characterized by the following: German wind resource is among the lowest in Europe, but the wind capacity is the first in the world, its development mainly depends on the support of national policy. In the development of large offshore wind power in the problems encountered is the natural protection, ocean transportation, high cost and other issues. Holland, the windmill has a long history, is well known in the world. But the wind power capacity in the world ranking is seventh only. He is facing the problem of construction plan of chaos, the government attitude. Denmark in world wind power development rank though in fourth, but its wind power equipment industry and its sales volume is the first in the world. Recently, the country will be in the two major marine installed wind power 160MW, which occupied the half of the country of world marine wind power. The UK wind power development is ranked the eighth, but the next few years the world offshore wind power development at the center of the finger. It has confirmed the 15 projects, total installed capacity amounts to 7200MW, accounting for the total generating capacity of 17%. The country is facing the problems of marine equipment transport, inconvenient transportation, high cost of submarine cable laying. In Asia, the original India behind China, in recent years the development trend 2006, leap to fourth in the world, at present its development momentum is still strong, is expected to reach second in the world. China, in January 1, 2006 the formal implementation of the " renewable energy law " is to promote the development of wind power industry climax, 20 years after China will become the leading and dominant world wind power market in the country.

2 of China's wind power status

Our country with a vast territory, a long coastline, wind power resources. Home 10 meters altitude wind energy resources total reserves of 3226000000 kilowatts, the actual utilization of about 253000000 kilowatts, offshore wind energy resources reserves of 750000000 kilowatts, a total of about 1000000000 kilowatts, equivalent to about 50 Gorges power station installed capacity. But China's wind power industry development is slower, the industry turning point from 2004 after rising energy prices and policies. With the development of coal, oil and other fossil energy prices rising rapidly, " renewable energy law ", energy-saving emission reduction policies promulgated, wind power market demand rapid growth. As of the end of 2006, the mainland China to build a wind farm in 91, installing wind motor group group 3311, total installed capacity is 25960000 kilowatt, ranking fifth in the world, second in asia. But the wind energy development and utilization level is not high still, only accounts for about 0.19% of the land utilization of wind energy.

We basically maintained on wind power equipment industry's early view, the domestic wind power investment "horse race encircles the ground " drive wind power equipment demand. Is expected in 2010 the total installed capacity of wind power is about 14000000 kW, newly installed capacity of 350 kilowatts, the annual growth rate of about 25%; the stable high quality fan equipment supply, major manufacturers capacity tension, current orders in 2009 before delivery, in MW wind turbine market, foreign products occupy a higher market share, the wind machine parts supply bottlenecks, in 2009 is expected to break the bottleneck of supply chain.

3 the wind energy with wire and cable market prospect is capacious

At present, China wind power wind energy cable as one of the research has just started, a large number of such cable products need to be imported, or just a few domestic enterprises development put into production. It is understood, wind energy cable due to wind power generation fan environment, longer service life, and the cable wind machine to rotate continuously, to cable performance requirements are higher, so the wind energy cable has been dependent on imports, and the price is high, R & D and vote with the domestic wind power cable is around the corner, the wind cable high-end home-made road shoulder heavy responsibilities, this must cause the domestic cable enterprises attach great importance to.

With the rapid development of wind power generation, wind power can meet the requirement of special environment of torsion resistance, cold resistance, salt spray resistance, oil resistance, resistance to ultraviolet light, soft, mobile features such as wind power cable will become the next few years of development priorities.

Generator stator using ultra high voltage cable, round cable will replace the rectangular copper bar, can make the generator without a transformer, thereby substantially reducing the cost. According to the principle of optimum design, large motor stator core groove is a rectangular, slot coil or bar selected conductors of rectangular cross section along the electric field intensity around the distribution is unequal, the four corners of up to 9KW/mm, while the four straight edge portion is only 3KW/mm. This will lead to great waste of insulating materials. Having a circular cross-section of the cable does not have this problem, the electric field intensity distribution. Fundamentally eliminate the corners of the field concentration, insulation thickness uneven and not thinning etc.. This reform can use electric field strength is increased from 2.5KW/mm to 15KW/mm. This round cable adopts industrial mass production of XLPE insulation, low cost, and the voltage can be as high as 500KW, effects of many factors such as voltage, power grid, local regulation rules, the maximum wind power output per unit surface, to the site of the distance, the influence to the environment. The output voltage of the generator to high power level, is no longer required after a step-up transformer connection. For a generator circular cable does not need the metal shield, though they use the same materials and solid extrusion insulation technology, belong to the same market popular standard commodity.

Round cable structure is characterized by: the cable insulation in semi conductor, solid insulating material ( made of cross-linked polyethylene composition ), the outer semiconducting layer. Insulating material within a single conductor layer twisted, which has a center line, with the line as the center of the circle is arranged around each circle around 6, 12, 18, 24, 30, 36 wires, ( there are 4 wires, forming a layer of wire ), each layer of wires twisted twisted in the opposite direction. The outermost surface of the cable, the outer conductor layer from ground zero, the utility model has the advantages of group interior does not appear around the group of partial discharge and corona discharge, the inductive voltage along the winding group group by zero gradually rises to power grid voltage, along the winding group group length has different electric field level, after calculation, the around the first turn of group group doing fine point, the successive turns gradual thickening insulation approach, it is required to produce with the cables of different diameters to produce around the group group, but also to improve the space utilization rate of the iron core. Around the group group cable is whole, without intermediate joint. ( China cable network )