Fan control system participating in power grid frequency modulation

Abstract

The invention provides a fan control system participating in power grid frequency modulation. The fan control system comprises a virtual inertia control unit with a power grid frequency and a frequency reference value as inputs and an active power instruction increment as an output, a torque control unit with fan output power and current fan speed as inputs and a fan torque reference value as an output, an active power control unit with the active power instruction increment, the fan torque reference value, the current fan speed and initial fan speed as inputs and an active power reference value as an output, and a pitch angle control unit with a fan wheel speed deviation and / or a fan active power deviation as an input and a fan pitch angle as an output. According to the fan control systemparticipating in the power grid frequency modulation, on the premise that a fan runs stably and the frequency of a power grid is not worsened, the speed and the pitch angle of the fan are adjusted, so that the rotating kinetic energy of the fan is fully utilized, the reduced output operation of the fan is avoided in the whole virtual inertia control process, and the supporting effect of the fan on the frequency of the power grid is improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind turbine control system participating in power grid frequency regulation. Background technique [0002] With the increasing penetration of wind power in the power system, especially after large-scale wind farms are directly connected to the high-voltage transmission grid, wind power has brought a non-negligible impact on the dispatching operation, safety and stability of the power system and many other aspects. . One of the key issues is the impact of large-scale wind power on the frequency of the power system and how to control the frequency of the power system including large-scale wind power to maintain the frequency level required by the power system. [0003] Wind power virtual inertia control refers to adding a system frequency response link to the wind turbine control system. When the system frequency changes, it can increase or decrease in a short tim...

AI Technical Summary

Problems solved by technology

[0005] In general, the conventional virtual inertia control provides frequency support in the stage of power increase, but in the stage of speed recovery, it needs to reduce the output to operate, and the output active power of the fan is less than the initial output active power, which will deteriorate when the proportion of wind power is high. The recovery of the grid frequency may even lead to a second drop in the system frequency, which brings certain risks to the grid operation

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