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Method for controlling double-fed wind power plant capable of improving transient stability of power grid

A technology of a double-fed wind farm and a control method, applied in the field of power transmission, can solve the problems of unbalanced power damping, zero transient voltage support capability, loss of grid transient stability of the double-fed wind turbine, etc., so as to improve the transient state. The effect of stable power angle, improving transient voltage stability and improving operational reliability

Inactive Publication Date: 2014-07-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, when the grid fails, the doubly-fed wind turbine loses the ability to maintain the transient stability of the grid, and its contribution to the grid inertia, damping effect of unbalanced power, and transient voltage support capacity are almost zero

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  • Method for controlling double-fed wind power plant capable of improving transient stability of power grid
  • Method for controlling double-fed wind power plant capable of improving transient stability of power grid
  • Method for controlling double-fed wind power plant capable of improving transient stability of power grid

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Embodiment Construction

[0030] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The present invention is realized in a centralized control mode. The total power of the grid-connected point of the wind farm is used as the control quantity. Its control structure includes two channels of active power control and reactive power control. When the power grid fails, the wind farm control center will Deviation, voltage deviation and voltage change rate, quickly adjust the active power and reactive power output of the wind farm, and distribute the active power and reactive power control amount to each unit and SVC according to a certain rule, accelerate the attenuation of unbalanced energy in the system, and provide reactive power for the system Power compensation can support the recovery and reconstruction of grid voltage, which can not only improve the transient power angle stability of the grid, but also impro...

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Abstract

The invention discloses a method for controlling a double-fed wind power plant capable of improving the transient stability of a power grid. According to the method, the total power of wind power plant grid connection points is used as the controlled quantity, when the power grid breaks down, a wind power plant control center is used for detecting the frequencies and voltages of the wind power plant grid connection points in real time, active power output and reactive power output of the wind power plant can be adjusted according to the frequency deviation, the voltage deviation and the voltage change ratio of the power grid, the active power control quantity and the reactive power control quantity are distributed to all sets and SVCs. Attenuation of system oscillation energy is accelerated, reactive power compensation is provided for the system, and the constancy of busbar voltages of the grid connection points can be maintained. By the adoption of the method, the active power output and the reactive power output of the wind power plant can be adjusted in real time according to the frequency change and voltage change of the wind power plant grid connection points, attenuation of the system oscillation energy is accelerated, the reactive power compensation is provided for the system, the transient state power angle stability of the power grid can be improved, and the transient voltage stability of the power grid can be improved.

Description

technical field [0001] The invention relates to a control method of a double-fed wind farm, which can ensure the stability of a wind power access system when a large disturbance occurs in a power grid, and belongs to the technical field of power transmission. Background technique [0002] As a clean and renewable energy, wind energy has been paid more and more attention by countries all over the world. In recent years, wind power has developed rapidly, from small-scale access to power distribution network to large-scale access to transmission network, showing different characteristics from the past. Due to the different characteristics of wind turbines from conventional synchronous generators, when a large disturbance occurs in the power grid, the transient stability of the power grid will change. [0003] The rotor speed of the doubly-fed wind turbine is decoupled from the grid frequency, and it can realize decoupling control of active and reactive power. At present, it ha...

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Application Information

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IPC IPC(8): H02J3/46
CPCY02E10/76
Inventor 卢锦玲徐超
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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