System and method for frequency filtering of a renewable energy power system

A method for controlling a renewable energy power system having at least one renewable energy asset connected to a power grid, the renewable energy power system providing a power output demanded by the power grid during a frequency disturbance of the power grid, the method comprising:

• receiving, via a controller, a grid frequency signal of the power grid;
• filtering the frequency signal via a first frequency filter having a first dynamic time constant, the first dynamic time constant varying as a function of a first grid parameter;
• and, filtering the frequency signal via a second frequency filter having a second dynamic time constant, the second dynamic time constant varying as a function of a second grid parameter of the frequency signal, wherein the first and second grid parameters comprise at least two of a magnitude of the frequency disturbance of the power grid, a duration of the frequency disturbance of the power grid, or a rate of change of frequency response, and wherein the frequency disturbance results from a load-to-power imbalance in the power grid;
• selecting one of the filtered frequency signals;
• and,
• controlling the at least one renewable energy asset based on the selected filtered grid frequency signal.

A system for controlling a renewable energy power system during a frequency disturbance of a power grid, the renewable energy power system connected to the power grid and providing a power output demanded by the power grid, the system comprising:

• one or more sensors configured to monitor the power grid to detect the frequency disturbance resulting from a load-to-power imbalance in the power grid, and to measure a grid frequency signal of the power grid;
• a frequency filter assembly for filtering the grid frequency signal, the frequency filter assembly having a dynamic time constant, the dynamic time constant varying as a function of two or more grid parameters of the grid frequency signal, wherein the two or more grid parameters comprise at least two of a magnitude of the frequency disturbance of the power grid, a duration of the frequency disturbance of the power grid, or a rate of change of frequency response;
• and,
• a controller configured to perform a plurality of operations, the plurality of operations comprising:
• determining a power command for the at least one renewable energy asset using the filtered grid frequency signal;
• and, controlling the at least one renewable energy asset based on the power command.