Wind Power Generation System with Induction Machine and Diode Rectifier

This paper investigates advantages of new combination of the induction generator for wind power and the power electronic equipments. Induction generator is popularly used for the wind power generation. The disadvantage of it is impossible to generate power at the lower rotor speed than the synchronous speed. To compensate this disadvantage, expensive synchronous generator with the permanent magnets sometimes used. If HVDC transmission is used to connect the offshore wind farm to the mainland, using AC/DC converter system is no more disadvantageous. However, to omit the expensive permanent magnet is desirable. In proposed scheme, the diode rectifier is used to convert the real power from the induction generator to the intermediate DC voltage, while the reactive power necessary to excite the induction generator only is supplied from the voltage source converter (VSC). This means that the rating of the expensive VSC is minimized and total cost of the wind power generation system is decreased compared to the system with synchronous generator