本文所述乃建構一種屬於可輔助電廠的小容量分散式獨立型發電系統，後端可搭配交/直流功率轉換器跟升/降壓直流截波器電路用於各種電器上或存於蓄電池中。 Because a large quantity of carbon dioxide produced in the whole world causes to intensify the greenhouse effect, using the pollutionless wind power in the power-generating system is one way not to worsen the situation. However, due to its low efficiency, the traditional vertical axis wind power system is not popular in the high energy-consuming age. Consequently, based on many fundamental theories, this thesis intends to design a new vertical axis wind turbine system with high efficiency.
After considering the advantages and disadvantages of different kinds of windmill, this thesis thoroughly studies the design of the windmill blade and the generator and further their improvements. Theoretically, this thesis uses the software Ansoft to analyze the magnetic circuit by the finite element method and also discusses the way to design the size of the permanent magnet by Taguchi method in order to improve the rate of voltage regulation. Practically, this thesis uses a low-noise vertical structure without pursing the wind combined with a lift-type Darrieus blade and a best drag-type paddle blade and a permanent magnet generator without iron core to implement a new vertical axis wind turbine system.
Many kinds of paddles and Savonius blade are compared on the performance of self-start function at low speed and hindering on rotation at high speed. The result shows that the cup paddle has better efficiency and thus is used with Darrieus blade in this thesis.
In the generator, first epoxy covering the coil winding instead of iron core of laminated silicon steel is used to fix the coils in the three-phase synchronous alternator. Since the generator does not induce the cogging torque effect because of the coreless design, it can rotate easily under the breeze situation. Second, based on the principle of direct drive, the transmission device without gearbox can combine the blade and the generator of the same speed together. Finally, with the external rotating permanent magnet, the generator does not need the complex components such as the exciter in order to increase the power-generating efficiency.
The proposed system is intended to establish a small distributed power system to assist the power generation in the power station. The system can be connected to the ac / dc power converter and the buck / boost dc chopper circuit to be applied in the various electric equipments or stored in the battery set.
