ABSTRACT
Heavy energy consumption and environmental pollution have become very serious issues in today’s world. Finding and developing new alternative energies has become a very urgent issue. Although an alternative fuel could be found to replace the petroleum oil and resolve the energy crisis problem, the gas waste would pollute the environment, which should be taken into account in the energy issues and environmental protection issues. It is thus a very important subject to develop a new kind of energy [1] that would produce less waste gas. Green energies that can replace fuel energy include wind energy, solar energy, biomass energy, and tidal energy, with the characteristic of being free, natural, free of pollution problems, and inexhaustible. The green energies are best suited to the contemporary needs. Currently, most of the focuses are on the development of wind ener-
gy [2, 3] and solar energy [4, 5]. The cost of developing wind force energy is much lower than that for the solar energy and that is the major advantage of wind force energy. For instance, the advanced countries, such as Germany, Denmark, the UK, and the USA have invested in the development of wind force energy [6]. The technology of converting wind force energy to electric energy has been maturely developed with many of the development results being applied to the power utilization in the people’s livelihood, commerce, and industry [7, 8].
