Rotating speed control method for ensuring stability of inertia response control of large wind generation set

Abstract

The invention discloses a rotating speed control method for ensuring stability of inertia response control of a large wind generation set. The rotating speed control method comprises the following steps that (1) the power grid frequency is detected by a wind generation set converter; (2) a wind generation set main control system controls a dead zone according to the power grid frequency and inertia response and judges whether the wind generation set enters into an inertia response control mode or not; (3) if yes, the wind generation set simulates the inertia response effect by releasing rotational kinetic energy stored by a wind generation set impeller and a power generator; (4) when the situation that the power grid frequency is restored within a dead zone range is judged or the situationthat the wind generation set is in the critical ability of inertia support is judged by the wind generation set, the rotating speed of the wind generation set begins to restore, and a constant rotating speed restoring control method is adopted; and (5) when the situation that the wind generation set is restored to the state that the output power is within the range of 90%-110% of the theoreticalpower of variable speed and variable pitch control operation is judged, the wind generation set enters into a switching control mode with a smooth and continuous accelerated speed. The rotating speedcontrol method for ensuring the stability of inertia response control of the large wind generation set solves the problems of secondary impact of a power grid and shutdown of the wind generation set due to the unsteady rotating speed of the wind generation set.

Description

technical field [0001] The invention relates to a control method of a wind power generating set, in particular to a speed control method for ensuring a stable inertia response control of a large wind generating set. Background technique [0002] The participation of wind power in power system frequency regulation has many benefits for the power grid: link frequency regulation pressure on the power grid, improve grid frequency stability, increase wind power penetration rate, increase the proportion of new energy, reduce spinning reserve capacity, reduce power grid spinning reserve capacity, reduce power grid Operating costs. More and more power companies require wind power to provide auxiliary services like conventional power plants. Some of the latest grid guidelines at home and abroad clearly state that grid-connected wind farms need to provide the same spinning reserve and inertial response as conventional power plants. And ancillary functions such as primary frequency mo...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of unstable speed of the wind turbine in the inertia response control of the wind turbine and solve the problem of unit shutdown and secondary impact on the power grid caused by the unstable speed of the wind turbine, the present invention provides a system that can stabilize the speed of the wind turbine during the inertia response control process. control method

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