Synthetic inertia control method and system of a wind turbine generator

A synthetic inertial control system of a wind turbine generator, the system comprising:

• a frequency deviation detection unit that detects a frequency deviation of a power system from a reference frequency and a measured system frequency;
• a rotor speed detection unit that detects a rotor speed of a wind turbine generator;
• a switching unit that switches between maximum power point tracking (MPPT) control and temporary frequency support (TFS) control;
• an active power reference value calculation unit that calculates an active power reference value for wind turbine generator output control using the frequency deviation and the rotor speed;
• and
• a control unit that controls a wind turbine generator according to the calculated active power reference value,
• wherein when switched to the temporary frequency support (TFS) control by the switching unit,
• the active power reference value calculation unit calculates an active power reference value that is increased from an original reference value according to the maximum power point tracking (MPPT) control at a time point (conversion time point) converted to the temporary frequency support (TFS) control,
• the increased active power reference value is calculated as a function of the frequency deviation and the rotor speed, and
• the control unit performs a first stage control according to an active power reference value calculated as a function of the frequency deviation and the rotor speed for a predetermined first time period from the conversion time point.