Establishment Method of Frequency Response Model and Calculation Method of Frequency Characteristic Index of Power System Including Wind Power

Abstract

The invention discloses a wind power-containing power system frequency response model building method and a frequency characteristic index calculation method. The model building method comprises the following steps of 1, assuming that a generator set of a conventional power system is a thermal generator set, and accessing a power network by a wind generator set with a generated energy ratio of p in total generated energy of a system, instead of the thermal generator set with the same capacity; 2, building a degradation dynamic frequency response model of the wind generator set by adopting a small signal analysis method according to a rotor motion equation of the wind generator set through adopting a frequency auxiliary control policy based on virtual inertia and pitch angle reduction for the wind generator set of a wind power plant; and 3, according to a frequency response model of the conventional power system and the built degradation dynamic frequency response model of the wind generator set, building a power system frequency response model considering wind power frequency modulation. The model built by adopting the method can quickly and accurately assess a dynamic frequency response characteristic of the power system.

Description

technical field [0001] The invention belongs to the technical field of power system dynamic frequency analysis, and in particular relates to a method for establishing a frequency response model of a power system and a method for calculating a dynamic frequency characteristic index of a power grid in consideration of wind power participating in frequency regulation. Background technique [0002] Large-scale wind power grid-connected operation is profoundly changing the dynamic operating characteristics of the power system. Unlike traditional synchronous generators, wind turbines are connected to the grid through power electronic conversion devices, and their output active power and grid frequency are completely decoupled. In addition, the wind turbines are generally in the maximum power operation state, and there is no reserved reserve power. The result is that wind turbines cannot contribute to the frequency response of the power system, and large-scale wind power grid conne...

AI Technical Summary

Problems solved by technology

However, there are few studies on the frequency dynamic response characteristics of large-scale wind power grid-connected power systems

[0004] The units of the traditional power system dynamic frequency response model are all thermal power units, and the access of large-scale wind power makes this model no longer applicable

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