An operation control method based on power limitation of wind turbines

Abstract

The invention relates to an operation control method based on the power limit of a wind power generating set. The invention firstly determines the minimum operating voltage limit U of the wind generating set according to the voltage adaptation characteristics of different components of the wind generating set L , analyze the components associated with the voltage reduction of the grid-connected point, and according to the rated current limit of the component, obtain the relationship between the output power P of different components and the voltage U of the grid-connected point, and take the minimum value of power as the power at the grid-connected point The power output limit P of the wind turbine under the working condition of voltage U L , to ensure that the actual output power of the wind turbine is lower than P L . The invention is implemented in a simple way, without changing the hardware of the wind power generating set, only by evaluating and checking the performance parameters of the existing components, and modifying the control software to realize the above functions. The method can realize that the wind generator can still be connected to the grid to generate electricity when the voltage of the grid connection point is lower than the lower limit of the standard voltage, so as to increase the income of the wind farm's power generation.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an operation control method based on power limitation of a wind power generating set. Background technique [0002] With the intensification of the world's energy crisis and the improvement of people's awareness of environmental protection, wind power has been paid more and more attention by people, and has become one of the most promising new energy sources. my country has abundant wind power resources, and the development of the wind power industry has a good resource base. By the end of 2019, the installed capacity of wind power in my country has reached 200 million kilowatts. However, most of my country's wind power is located in remote areas, and is generally connected to the end of the power grid, resulting in a generally low voltage at the grid-connected point of wind power. In some cases, the voltage at the grid-connected point of wind power has been lower t...

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Problems solved by technology

[0007] In order to solve the problem that the existing wind power generators cannot operate normally when the voltage at the grid-connected point decreases, the present invention provides an operation control method based on the power limitation of the wind power generators, and studies the low-voltage adaptability of the main components of the wind power generators, Combined with the characteristics of wind turbines that can automatically limit the output power, to ensure that the low-voltage protection control strategy of the existing wind turbines is optimized on the premise of satisfying the operation safety of each component, the low-voltage operating range of the unit is increased, and the power generation of the wind farm is improved. Quantitative income

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