Wind turbine generator and method of controlling the same
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsAkira Yasugi, Tsuyoshi Wakasa, Hisanobu Shinoda
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Abstract
An object of the present invention is to, if a frequency decrease has occurred in a power system, avoid a trip in a wind turbine generator and reliably contribute to recovery of the frequency of the power system. The present invention provides a wind turbine generator that, if a predetermined frequency decrease that requires PFR has occurred in the power system, calculates a marginal active power based on the difference between a predetermined rotational speed lower limit value, which is obtained by providing the parallel-off rotational speed with a predetermined margin, and a measured value of the shaft rotational speed, and generates an active power command value based on the marginal active power.
Claims10
A wind turbine generator for increasing active power output to a power system while avoiding a trip in a case where a frequency decrease has occurred in the power system, the wind turbine generator comprising:
- a detection unit that detects a predetermined frequency variation;
- and
- a first control unit that, in a case where the predetermined frequency variation that requires a PFR (Primary Frequency Response) has been detected by the detection unit, calculates a marginal active power based on a difference between a predetermined rotational speed lower limit value, which is obtained by providing a parallel-off rotational speed with a predetermined margin, and a measured value of a shaft rotational speed, and generates and outputs an active power command value indicating active power to be supplied to the power system based on the marginal active power, to avoid a trip,
- wherein the first control unit outputs, in the case where the active power command value exceeds a power upper limit value which is determined based on constraints arising from the mechanical configuration of the wind turbine generator, the power upper limit value as the active power command value.
A method of controlling a wind turbine generator for increasing active power output to a power system while avoiding a trip in a case where a frequency decrease has occurred in the power system, comprising:
- a first step of detecting a predetermined frequency variation;
- a second step of calculating, in a case where the predetermined frequency variation that requires a PFR (Primary Frequency Response) has been detected, a marginal active power based on a difference between a predetermined rotational speed lower limit value, which is obtained by providing a parallel-off rotational speed with a predetermined margin, and a measured value of a shaft rotational speed, and generating and outputting from a control unit a first active power command value indicating active power to be supplied to the power system based on the marginal active power, to avoid a trip;
- and
- outputting from the control unit, in a case where the first active power command value exceeds a power upper limit value which is determined based on constraints arising from the mechanical configuration of the wind turbine generator, the power upper limit value as the active power command value.
Dependencies are inferred from the claim text.