An Inertia Response Optimal Control Method for Large Wind Turbines

Abstract

An inertia response optimization control method for a large wind turbine generator comprises the steps of 1) detecting to obtain the generator, the power grid frequency, the wind speed and the pitch angle through detection; 2) determining whether the wind turbine generator operates in a speed change stage or not, and whether the wind turbine generator enters an inertia response control mode or not; 3 ) if yes, storing the initial wind speed and the initial generator rotating speed at the moment entering into the running mode; 4 ) carrying out low-pass filtering on the wind speed; 5) calculating to obtain the optimal target control rotating speed of the generator; 6) calculating the expected generator torque output by a speed-variable control ring; 7) calculating to obtain the expected torque of the generator which is actually output; 8) outputting the expected torque of the generator to a converter of the wind turbine generator set for controlling the electromagnetic torque of the generator; and 9) determining whether to exit the inertia response control mode or not according to the power grid frequency, and if yes, recovering and tracking the expected torque of the generator to the optimal torque of the generator according to the set slope. Coordination control and smooth switching between the inertia response control ring and the speed-variable control ring are effectively achieved.

Description

technical field [0001] The invention relates to a control method for a wind power generating set, in particular to a control method for a wind generating set participating in power grid frequency regulation. Background technique [0002] my country is the country with the largest wind power scale and the fastest development in the world. By the end of 2016, my country's new installed wind power capacity was 23.37 million kilowatts, and the cumulative installed capacity reached 168 million kilowatts, ranking first in the world. With the rapid increase of installed capacity of wind power in my country, the proportion of installed capacity of wind power in the total installed capacity of electric power is also increasing, and the installed capacity of wind power in some power grids even exceeds 20% of the total capacity. The safe and stable operation of wind power grid-connected after a high proportion of wind power is connected to the power system is becoming increasingly seve...

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the shortcomings of the variable speed control loop output expected generator torque serious distortion and poor control effect in the existing wind turbine inertia response control mode, the present invention provides an effective solution to the problem of severe distortion of the variable speed control loop output expected generator torque , Inertia response optimization control method for large-scale wind turbines with better control effect

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