Wind turbine grid adaptability test device and test method

Abstract

The wind turbine grid adaptability test device of the present invention includes two back-connected modular multilevel converters, a disturbance generation module and a DC charging start-up module, and the disturbance generation module includes a software signal for generating a disturbance control signal The generation unit and the control unit that executes the control signal to generate the disturbance signal, and the disturbance generation module is connected with the modular multilevel converter connected to the 35KV bus of the wind turbine. The beneficial effect is that it can flexibly simulate various disturbances including voltage fluctuation, frequency jump, voltage harmonic or three-phase unbalance and flicker under the grid-connected voltage level of the wind turbine. At the same time, the device adopts a modular multi-level converter structure without a transformer, and is directly connected in series to the grid of the current 35kV grid-connected voltage level of the wind turbine.

Description

technical field [0001] The invention belongs to the technical field of network access detection for wind power generators connected to power systems, and in particular relates to a grid adaptability test device and method for a megawatt-level wind power generator based on a modular multilevel converter. Background technique [0002] At present, the proportion of wind power in China's power grid is constantly increasing, and it is gradually developing from decentralized, small-scale development, and local consumption to large-scale, highly concentrated development, and long-distance, high-voltage grid transmission. In order to standardize the grid connection of wind farms, promote the scientific, healthy and sustainable development of wind power, and ensure the safe and stable operation of wind farms and power grids, the State Grid Corporation of China has issued the "Technical Regulations of the State Grid Corporation of Wind Farms Connected to the Grid". In terms of wind fa...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the existing wind turbine power grid adaptability test device that adopts a series connection of low-frequency voltage disturbance device and high-frequency voltage disturbance device, which has complex structure, high price, difficult control and easy mutual interference, etc., and proposes a Wind turbine grid adaptability test device and wind turbine grid adaptability test method based on the device

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