Wind Solar Power System is the source of all the energy on earth，Wind energy is another form of expression in the Earth's surface. Wind and solar energy have low energy density, the stability is weaknesses, and they are influence by geographical distribution, seasonal changes, day and night alternation. However, Solar and wind energy have Complementary in time and geographical. And the most sunlight during the day, thewind less, the evening sun, the light is very weak, but the surface’ temperature of earth has changed and wind to strengthen large. In summer, Sunlight is strength and wind is small. In winter, sunlight is weak and wind is strength. Stable is reliable solar power generation, but it has higher costs now. And wind power costs are lower, but random, and reliable power supply is poor. Day and night achieve power generation resources in the conditions of the suitable weather, wind / photovoltaic generating system can be complementary to each other to improve the continuity of electricity supply systems, stability and reliability if we can get them together. Therefore, the wind / PV hybrid generating system is the best resources of independent power system, in many areas has been widely used. Solar photovoltaic systems have many factors to effect. the complexity of the design not only to achieve both long-term reliability to meet the needs of the load, but also makes the minimum system configuration capacity, investment at least, must be carried out to optimize the system design, wind power generation system is also true . But the wind / optical hybrid generating system to the characteristics of two different power generation systems by combining their respective strengths in order to achieve the best match, which more than two separate power system design more difficult and complicated. A lot of wind / light power generation system while so-called optimized design, in fact, these two do not really complement each other power generation systems. Along with the production and living standards are improved, the world's energy consumption growth. Study shows that, 1965’s energies were increased almost 6 times than 1900. The past 40 50 years, a large portion of energy consumption come from fossil fuels. Many times the energy crisis led to the recognition that mineral resources are limited, the world's oil resources can only be maintained for several decades, people have gradually concern by shifting the focus to new energy development and utilization up. Expected the next century, new energy will be more important position of energy in the world. It was the atomic energy and solar energy can be referred to as the 21st century source.

Energy is a human life, one of the five elements that is the national economic and social development of strategic materials. New and renewable sources of energy mean that mass-energy, wind energy, solar energy, small hydropower, ocean energy, geothermal energy, hydrogen energy and other energy resources except to conventional energy sources other than hydropower and large-scale biological. At present, new sources and renewable sources of energy mainly in the form of non-commodity energy for the general provision of energy supply in rural areas, but with the social and economic development of new and renewable sources of energy is also steadily to change the direction of the commercialization of energy. Solar and wind energy applications is the relatively wide range of two renewable energy sources. Solar and wind energy have few advantages than other conventional energy sources to use. The interior of Solar releasing a huge light and heat due to nuclear fusion of hydrogen thermo nuclear reaction, which is the source of solar energy. Hydrogen production capacity in the area of nuclear fusion, hydrogen burning time of nuclear stability can be more than 60 million years. This means that the sun can be used indefinitely as now at least 60 million years., especially that conventional energy sources are less than before, it is extremely attractive to more people. Injection of energy the sun, the earth is only one ten thousandth 20, and the rest are lost to space, went to BU.The Earth's surface are entitled to receive 7.034×1024 Joule of energy for one year, which is equivalent to 200 trillion tons of coal combustion issued by the tremendous heat. According to the calculation of M.R.Gustavson, solar flux between the earth and the sun is 1400 W / m2, and the Earth's surface, the energy gained per second for the 350 W / m2, converted to electricity for one year equivalent to about 1.58×1018 degrees. Wind energy is a transformed form of Solar, which is estimated by M.R.Gustavson, boundary layer winds in the global total energy of 1.3×1015 watts, the year of about 1.14×1016 Kilowatt-hour of energy.

At present, this is equivalent the annual world energy by burning about 3000 times. Fossil fuels, coal and oil resources are uneven geographical, and industry caused by the uneven distribution of coal and oil transport uneven. Even it can be powered by electricity, but a number of mountains, islands, grasslands and high altitude, such as power grids are not easily accessible place, make full use of the advantages of energy weather will bring convenience. Although the distribution of solar and Small wind generator energy also has some limitations, but with the fossil energy, hydropower and geothermal energy, such as the comparison may be held to be a broader distribution of energy. Resources such as the world's oil distribution in the face of the earth do not Uniform, the world's proven oil reserves, only in the Middle East on the world's total reserves of 57%, and some consumer State-owned oil more oil reserves and output are relatively more, and some even do not produce oil. Coal carbon is also very uneven distribution of resources, the vast majority of the world's coal resources are embedded in the region for more than 300N, The former soviet union, the united States and china account coal for about 90% in the world. 

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