A wind power generation system wherein procedure for controlling the blade pitch is changed in accordance with the rate of decrease in the amplitude of the grid voltage, and when over current occurs in the grid-side power converter, the grid-side power converter is brought into the gate-blocked condition whereas the generator-side power converter continues its operation. Recombinant plasmids and bacteriophage transfer vectors incorporating these sequences are also disclosed. A plurality of unchanging file types are placed in a first grouping. A mold cavity is in communication with the nozzle channel, the mold cavity for receiving the melt stream from the nozzle channel through a mold gate.