Method and device for wind turbine generator to participate in frequency modulation of power system under zero standby condition

Abstract

The invention discloses a method and device for a wind turbine generator to participate in frequency modulation of a power system under a zero standby condition, and the method comprises the steps: building a correlation model of the wind turbine generator and a synchronous machine under the zero standby condition; the correlation model contains a fan power equation and a multi-term parameter equation; linearizing the multiple parameter equations in the correlation model, and combining the fan power equation to obtain a transfer model about the power change of the wind turbine generator and the frequency change of the power system; reducing the order of the transfer model, and then carrying out anti-Laplace transformation to obtain the lowest point of the frequency of the power system; and calculating the sensitivity of the droop coefficient of the frequency controller according to the lowest point of the frequency, and changing the parameter value of the frequency modulation controller in combination with the sensitivity. By adopting the embodiment of the invention, the quantitative relationship between the lowest point of the frequency of the power system and the fan frequency controller parameters is determined, so that the controller parameters are reasonably adjusted and designed, and the frequency of the power system is quantitatively and stably regulated and controlled.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and device for wind turbines to participate in power system frequency regulation under zero-standby conditions. Background technique [0002] In recent years, the large-scale connection of wind turbines has reduced the overall inertia level of the power system, and the problem of frequency stability has become increasingly prominent. Therefore, the frequency modulation capability of wind turbines has attracted widespread attention. At present, there are two main ways for wind turbines to participate in frequency regulation: the first is a backup mode, that is, the wind turbine operates in a load reduction state through overspeed load reduction or pitch angle load reduction, and releases backup power for frequency support when the frequency fluctuates. The second is the zero standby mode. The fan works in the MPPT mode and provides frequency support by relea...

AI Technical Summary

Problems solved by technology

[0003] However, most of the current research on additional frequency controllers is based on simulation methods, which can only qualitatively analyze the improvement of the frequency response of the system by the frequency controller, and cannot determine the value of the controller parameters based on the quantitative relationship between the system frequency response and the controller parameters. scope

The inability to accurately quantitatively adjust means that the backup energy of the rotor kinetic energy cannot be used reasonably, and the frequency regulation capability provided by the power system is not stable enough.

Images