Patent ID: 9728969
Date: 2017-08-08
CPC Classifications: F03D,H02J,H02P,Y02E

Claim:
1. A method for controlling a power output from a wind power system coupled with an electrical grid, wherein the wind power system comprises a wind turbine having a rotor, the method comprising: monitoring, at a connection point of the wind power system with the electrical grid, a grid voltage of the electrical grid; generating an internal reference voltage having an angular frequency and a phase angle; comparing a phase angle of the grid voltage to the phase angle of the internal reference voltage to generate a quadrature component of the grid voltage; generating, based on the quadrature component of the grid voltage, a synthetic inertial response signal representing a desired inertial response to be provided to the electrical grid by the wind power system; applying, responsive to a magnitude of the generated synthetic inertial response signal exceeding a non-zero predefined threshold value, a power offset signal to a power set point signal of the wind power system, wherein the power offset signal includes the synthetic inertial response signal as a component; monitoring an angular speed of the rotor; in response to the angular speed of the rotor falling below a reference threshold, setting a recovery flag indicating that the rotor has insufficient kinetic energy to provide an inertial response; in response to the synthetic inertial response signal exceeding the predefined threshold value, setting an inertia flag indicating that the wind power system is providing an inertial response to the electrical grid; and performing one of: