CPC H02J 3/381 (2013.01) [F03D 9/255 (2017.02); H02J 2300/20 (2020.01)] | 17 Claims |
1. A method for providing frequency response for a renewable energy plant coupled to an electric power grid, the renewable energy plant having an intermittent energy source, the method comprising:
using a renewable energy plant control system, measuring frequency of the power output from the renewable energy plant and determining a first difference signal between the measured frequency and a frequency reference;
measuring power output from the renewable energy plant and storing the measured power output as a stored measured power output value;
while the first difference signal is within a predetermined frequency deviation deadband, determining a second difference signal as a difference between a power reference and the measured power output;
while the first difference signal indicates an over-frequency condition, determining the second difference signal as a difference between the stored measured power output value and the measured power output;
while the first difference signal indicates an under-frequency condition, setting the second difference signal equal to the power reference;
generating an error signal by limiting a sum of the first and second difference signals between predetermined minimum and maximum power error limits;
generating a control signal by applying the error signal to a controller; and,
applying the control signal to the intermittent energy source to control the power output therefrom.
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