Device and method for testing power grid adaptability of wind power generating unit

Abstract

A device for testing power grid adaptability of a wind power generating unit comprises two modularized multi-level current converters in back connection, a disturbance generating module and a direct-current-charging starting module. The disturbance generating module comprises a software signal generating unit used for generating disturbance control signals and a control unit used for executing the control signals to generate disturbance signals, and the disturbance generating module is connected with the modularized multi-level current converter connected with a 35KV bus of the wind power generating unit. The device has the advantages that flexible simulation of various disturbances like voltage fluctuation, frequency hopping, voltage harmonic or three-phase unbalance and flickering of the wind power generating unit under a grid-connected voltage level; the modularized multi-level current converters are adopted, a transformer is not needed, and the device can be directly connected in a power grid, at a 35KV grid-connected voltage level, of a current wind power generating unit.

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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