A method for coordinate control of frequency regulation and voltage regulation of doubly fed wind turbine generator system under weak power network condition

Abstract

The invention discloses a coordinated control method and a device for frequency regulation and voltage regulation of a doubly-fed wind turbine generator system under the condition of a weak power network. The method comprises the following steps: detecting a power network frequency and a power network voltage of a power system; judging whether the power network frequency crosses a frequency dead zone; judging whether the power network voltage crosses a voltage dead zone; and judging whether the power network voltage crosses a voltage dead zone. If the grid frequency crosses the frequency deadzone and the grid voltage crosses the voltage dead zone, the grid frequency is regulated by the active power control of the wind turbine generator system, and the grid voltage is regulated by the reactive power control of the wind turbine generator system. If the grid frequency does not cross the frequency dead zone and the grid voltage crosses the voltage dead zone, the grid voltage is regulatedby the reactive power control of the wind turbine generator system, and the active power damping control of the wind turbine generator system is carried out. The technical proposal disclosed in the present application can improve the frequency and voltage stability of the power system.

Description

technical field [0001] The invention relates to the technical field of wind power generation, and more specifically relates to a method and device for coordinated control of frequency modulation and voltage regulation of doubly-fed wind turbines under weak grid conditions. Background technique [0002] Doubly-fed wind turbines composed of double-fed generators are currently the most mature and widely used wind turbines. [0003] With the continuous increase of the installed capacity of wind turbines, the proportion of wind power access in the power system is also increasing. However, when doubly-fed wind turbines (referred to as wind turbines) are connected to weak power grids, the fluctuation and uncertainty of wind energy will lead to fluctuations in the output of wind turbines. In addition, wind turbines themselves have many different operations from conventional generators. The characteristics and control methods make the wind turbines have a certain impact on the frequ...

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Problems solved by technology

However, when doubly-fed wind turbines (referred to as wind turbines) are connected to weak power grids, the fluctuation and uncertainty of wind energy will lead to fluctuations in the output of wind turbines. In addition, wind turbines themselves have many different operations from conventional generators. The characteristics and control methods make the wind turbines have a certain impact on the frequency and voltage of the power system after they are connected to the weak grid, which will aggravate the instability of the frequency and voltage of the power system under the condition of the weak grid

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