Wind turbine grid adaptability test device and test method

A technology for adaptive testing and wind turbines, applied in the direction of motor generator testing, measuring devices, measuring electricity, etc., can solve problems such as easy mutual interference, high price, difficult control, etc., to meet the requirements of diversity and control flexibility Effect

CN103969578BInactive Publication Date: 2017-02-01UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-02-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0024] The following examples of the present invention are carried out on the premise of the technical solutions of the present invention, and detailed implementation methods and specific operation processes are provided, but the protection scope of the present invention is not limited to the following examples.

[0025] Such as figure 1 As shown, the wind turbine power grid adaptability test device of this embodiment includes two modular multilevel converters connected in reverse, one of the multilevel converters is connected to the 35KV bus of the wind turbine, and the other multilevel The level converter is connected to the 35KV bus of the power grid; the device also includes a disturbance generation module and a DC charging start-up module, the disturbance generation module includes a software signal generation unit for generating a disturbance control signal and a control unit for executing the control signal to generate a disturbance signal, The disturbance generating mo...