Method and system for establishing equivalent model of doubly-fed wind generator group

Abstract

The invention relates to a method and system for establishing an equivalent model of a doubly-fed wind turbine group. The active power and reactive power of the doubly-fed wind turbine group during the low-voltage ride-through of the doubly-fed wind turbine group are set based on the low-voltage ride-through characteristic of the doubly-fed wind turbine group, not only the overspeed off-grid of the doubly-fed wind turbine group during the LVRT can be inhibited, but also the double-fed wind turbine generator set can be ensured to provide reactive power support for a power grid in the LVRT period according to the requirements of the national standard GB / T36995-2018 Wind Turbine Generator Fault Voltage Ride Through Test Regulations of the People's Republic of China. On the basis, a doubly-fed wind generator group equivalence method is provided. According to the method, the order of the doubly-fed wind turbine group model is reduced, and the simulation speed can be improved on the premise of ensuring the simulation precision.

Description

technical field [0001] The invention relates to the technical field of wind power networking, in particular to a method and system for establishing an equivalent model of a doubly-fed wind turbine group. Background technique [0002] Large-scale development and utilization of renewable energy is an important way to deal with the depletion of fossil fuels and the greenhouse effect. Wind energy is currently the non-water renewable energy with the most commercial development potential, and the interconnection of wind power is an important way to develop and utilize wind energy on a large scale. [0003] With the continuous increase of the scale of wind power interconnection, the wind turbine group is disconnected from the grid due to the influence of the grid failure, which brings power shocks to the connected grid, and in severe cases, endangers the safe operation of the power system containing wind power. The lack of low voltage ride-through (LVRT) capability of wind turbine...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for establishing an equivalent model of a doubly-fed wind turbine group, using the equivalent model to reduce the model order of the wind turbine group, and improving the simulation speed under the premise of ensuring accuracy, so as to solve the existing simulation calculation amount The problem of low efficiency of large and simulation analysis

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