METHOD AND SYSTEM FOR CONTROLLING A RENEWABLE ENERGY PLANT

A method for controlling power flow between a renewable energy plant and an electric power grid, the plant having an intermittent energy source, the method comprising: using a control system, measuring power output from the plant and determining a first difference between the measured power output from the plant and a power reference; measuring frequency deviation of the power output from the plant and determining a second difference between the measured frequency deviation and a frequency deviation reference; generating a first error by limiting a sum of the first and second differences between predetermined minimum and maximum power error limits; modelling power output from the source and determining a second error between the modelled power output from the source and a control signal applied to the source to control the power output therefrom; and, generating the control signal by applying the first and second errors to a PI loop.