Modulating wind power plant output using different frequency modulation components for damping grid oscillations

A controller for a wind power plant comprising a plurality of wind turbines and producing a plant power output, the controller comprising:

• one or more processors configured to:
• receive a modulation request signal indicating a requested modulation of the plant power output, wherein the requested modulation specifies a plant modulation frequency and is counter-phase to a power oscillation on an electrical grid;
• select at least two wind turbines of the plurality of wind turbines to fulfill the requested modulation;
• and
• in response to determining that the plant modulation frequency is equal to a susceptible frequency at which a first wind turbine of the at least two wind turbines has a greater susceptibility to mechanical oscillations, generate a respective power reference signal for each of the selected at least two wind turbines,
• wherein each generated power reference signal includes a respective modulation component corresponding to a portion of the requested modulation and having a respective modulation frequency different than the plant modulation frequency, and
• wherein a waveform of the requested modulation is an arithmetic sum of the respective modulation components.

A computer program product comprising a non-transitory computer-readable device having computer-readable program code embodied therewith, the computer-readable program code configured to perform an operation for controlling a wind power plant comprising a plurality of wind turbines and producing a plant power output, the operation comprising:

• receiving a modulation request signal indicating a requested modulation of the plant power output, wherein the requested modulation specifies a plant modulation frequency and is counter-phase to a power oscillation on an electrical grid;
• and
• in response to determining that the plant modulation frequency is equal to a susceptible frequency at which a first wind turbine of the plurality of wind turbines has a greater susceptibility to mechanical oscillations, generating a respective power reference signal for each of at least two wind turbines of the plurality of wind turbines selected to fulfill the requested modulation,
• wherein the at least two wind turbines comprises the first wind turbine,
• wherein each generated power reference signal includes a respective modulation component corresponding to a portion of the requested modulation and having a respective modulation frequency different than the plant modulation frequency, and
• wherein a waveform of the requested modulation is an arithmetic sum of the respective modulation components.