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A start-up method of a wind turbine generator includes a step of increasing a pitch angle of a wind turbine blade from a feather pitch angle to a fine pitch angle. The step of increasing the pitch angle of the wind turbine blade includes steps of: determining based on first to n-th pitch angles (n≧2

A start-up method of a wind turbine generator includes a step of increasing a pitch angle of a wind turbine blade from a feather pitch angle to a fine pitch angle. The step of increasing the pitch angle of the wind turbine blade includes steps of: determining based on first to n-th pitch angles (n≧2) greater than the feather pitch angle and smaller than the fine pitch angle and first to n-th rotational speed conditions associated with the first to n-th pitch angles, respectively, whether a control target rotational speed, which is a wind turbine speed or generator speed, satisfies the i-th rotational speed condition when the pitch angle reaches the i-th rotational speed out of the first to n-th pitch angles, the first to n-th pitch angles and the first to n-th rotational speed conditions being stored in a storage unit; decreasing the pitch angle to the (i−1)-th pitch angle or the feather pitch angle in a case that the control target rotational speed does not satisfy the i-th rotational speed condition when the pitch angle reaches the i-th pitch angle; and increasing the pitch angle to the (i+1)-th pitch angle or the fine pitch angle in a case that the control target rotational speed satisfies the i-th rotational speed condition when the pitch angle reaches the i-th pitch angle.

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1. A start-up method of a wind turbine generator, comprising: a step of increasing a pitch angle of a wind turbine blade from a feather pitch angle to a fine pitch angle,wherein the step of increasing said pitch angle includes using a controller to:determine, based on first to nth pitch angles (n≧2)

1. A start-up method of a wind turbine generator, comprising: a step of increasing a pitch angle of a wind turbine blade from a feather pitch angle to a fine pitch angle,wherein the step of increasing said pitch angle includes using a controller to:determine, based on first to nth pitch angles (n≧2) greater than said feather pitch angle and smaller than said fine pitch angle and first to nth rotational speed conditions associated with said first to nth pitch angles, respectively, whether a control target rotational speed, which is a wind turbine speed or generator speed, satisfies an ith rotational speed condition out of said first to nth rotational speed conditions when said pitch angle reaches an ith rotational speed out of said first to nth pitch angles, the first to nth pitch angles and the first to nth n-th rotational speed conditions being stored in a storage unit of the controller, wherein n≧i≧1;decrease said pitch angle to an (i−1)th pitch angle or said feather pitch angle in a case that said control target rotational speed does not satisfy said ith rotational speed condition when said pitch angle reaches the ith i-th pitch angle; andincrease said pitch angle to an (i+1)th pitch angle or said fine pitch angle in a case that said control target rotational speed satisfies said ith rotational speed condition when said pitch angle reaches said ith pitch angle. 2. The start-up method according to claim 1, further comprising a step of: outputting an alarm in a case that said control target speed does not reach a predetermined interconnection speed when an elapsed time which is reckoned in response to a wind speed exceeding a start-up wind speed reaches a predetermined time. 3. A wind turbine generator, comprising: a wind turbine rotor including a wind turbine blade having a variable pitch angle;a generator coupled to said wind turbine rotor; anda controller for controlling said pitch angle,wherein said controller includes a storage unit storing first to nth pitch angles (n≧2) greater than a feather pitch angle and smaller than a fine pitch angle, and first to nth rotational speed conditions associated with said first to nth pitch angles, respectively,wherein said controller controls said pitch angle of said wind turbine blade to be increased from said feather pitch angle to said fine pitch angle,in the control for increasing said pitch angle from said feather pitch angle to said fine pitch angle, said controllerdetermines whether a control target rotational speed, which is a wind turbine speed or a generator speed, satisfies an ith rotational speed condition out of said first to nth rotational speed conditions when said pitch angle reaches an ith pitch angle out of the first to nth pitch angle,decreases said pitch angle to an (i−1)th pitch angle or said feather pitch angle if said control target rotational speed does not satisfy said ith rotational speed condition when said pitch angle reaches said ith i-th pitch angle, andincreases said pitch angle to an (i+1)th pitch angle or said fine pitch angle if said control target rotational speed satisfies said ith rotational speed condition when said pitch angle reaches said ith pitch angle, wherein n≧i≧1. 4. The wind turbine generator according to claim 3, wherein said controller reckons an elapsed time in response to a wind speed exceeding a start-up wind speed, and outputs an alarm in a case that said control target speed does not reach a predetermined interconnection speed when said elapsed time reaches a predetermined time.