A Wind Farm Equivalence Modeling Method Applicable to Subsynchronous Research

Abstract

The invention discloses an equivalent modeling method applicable to subsynchronous research of a wind power plant. The wind power plant equivalent modeling method comprises the steps of setting fan number n of the wind power plant, performing calculation to obtain n is equivalent to an equivalent parameter of a single unit and a transformer at an outgoing line end of the single unit; calculating aseries equivalent impedance parameter of a current collection system in the wind power plant according to a wiring mode of the system; calculating a parallel equivalent impedance parameter of the current collection system on the basis of the series equivalent impedance parameter; and building a simplified equivalent model of the wind power plant according to the calculated power generator set equivalent parameter, the transformer equivalent parameter and the series / parallel equivalent parameter of the current collection system. The equivalent modeling method is used for subsynchronous equivalent modeling analysis of the wind power plant. When the equivalent model is used for analyzing synchronous characteristic of the wind power plant, the time domain simulation calculation quantity can be reduced under the condition that the accuracy of a detail model is achieved, the simulation analysis time is shortened, and the subsynchronous characteristic analysis efficiency of the wind power plant is improved.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a wind farm equivalent modeling method suitable for subsynchronous research. Background technique [0002] In recent years, wind power has become the fastest growing new energy power generation method in the world. As of the end of 2016, my country's new wind power installed capacity reached 23GW, and the cumulative installed capacity reached 168.7GW, ranking first in the world. Since my country's wind energy resources are far away from the load center, the use of series capacitor compensation transmission technology is an effective measure to improve large-scale, long-distance wind power transmission capacity. However, large-scale wind farms have the threat of subsynchronous oscillation in power transmission through series capacitor lines. In the face of complex large-scale power systems, it is undoubtedly the most accurate method in theory to establish a detailed electrom...

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Problems solved by technology

[0005] At present, there is no method that can directly calculate the impedance value in the equivalent value of the wind farm collector system while taking into account the current amplitude and phase

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