Method and device for detecting active power of wind turbine

A system for detecting an available active power of a wind turbine, wherein the system comprises:

• a processor;
• and
• a memory storing a computer program, wherein:
• the computer program when executed by the processor configures the system to:
• acquire a current rotation speed of a rotor of a wind turbine and a current outputted active power of the wind turbine;
• determine an effective wind speed of the wind turbine and a current rotation speed and the current outputted active power;
• determine a maximum active power capable to be captured by the wind turbine at the current rotation speed, based on the effective wind speed and a maximum utilization-rate coefficient for wind energy of the wind turbine at the current rotation speed;
• determine a maximum active power capable to be outputted by the wind turbine, based on the maximum active power capable to be captured and a corresponding power loss, and determine a release power, at which the wind turbine is capable to release rotation kinetic energy of the wind turbine for a predetermined time at the current rotation speed;
• and
• determine the available active power of the wind turbine, based on the maximum active power capable to be outputted, the release power, and the current outputted active power.