Active power control method for wind power plant participated power grid frequency modulation

A technology of active power and control method, which is applied in the field of active power control in which wind farms participate in power grid frequency regulation, can solve the problems of reducing output power stability, poor frequency effect, and not considering the working conditions of wind turbines.

Inactive Publication Date: 2016-07-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, the active power distribution algorithm of wind farms is commonly used as the average distribution algorithm, but this distribution method has a major disadvantage that it does not consider the actual conditions such as the working conditions of

Method used

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  • Active power control method for wind power plant participated power grid frequency modulation
  • Active power control method for wind power plant participated power grid frequency modulation
  • Active power control method for wind power plant participated power grid frequency modulation

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Embodiment

[0079] In order to illustrate the technical effects of the present invention, the active power control method of the present invention is applied to a wind farm with 15 wind turbines, each with a capacity of 1.5MW, for simulation verification. Assuming that the dispatching value of the power grid is equal to the active output value of the wind farm at the beginning, and is balanced with the load, set the active power dispatching value P 0 =15MW, load power P L = 15MW. Let the correction coefficient K=-50 in FM mode I. The effectiveness of the method of the present invention is illustrated by taking a sudden load reduction of 7MW in 20s as an example.

[0080] image 3 It is a comparison chart of the power grid frequency deviation effect when the load is suddenly reduced by 7MW. Such as image 3 As shown, if the method of the present invention is not used, when the load suddenly decreases by 7MW, the grid frequency deviation Δf will rise to 0.14Hz, and if the wind farm par...

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Abstract

The invention discloses an active power control method for wind power plant participated power grid frequency modulation. Wind turbine units are divided into a critical unit, a low air speed unit and a high air speed unit according to the operating conditions of the wind turbine units; the active dispatching power is modified according to the real-time frequency deviation and the active power adjustable value of the wind power plant to obtain active power modification values of the wind power plant participated power grid frequency modulation; and then the active power modification values are allocated to each wind turbine unit of each type according to the types of the wind turbine units to enable the wind turbine units of each type to participate in the frequency modulation based on a certain sequence. According to the active power control method, the wind power plant is taken as the object and the wind power plant participates in the power grid frequency modulation within a certain frequency deviation; the active power control method considers the reasonable distribution of the frequency modulation amount among the units according to the different operating conditions of the units and the active adjustable amount of the wind turbine units; and therefore, the wind power plant can make response rapidly, and the power grid frequency deviation can be reduced to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of wind farm active power control, and more specifically relates to an active power control method in which wind farms participate in power grid frequency modulation. Background technique [0002] Frequency is one of the most important operating parameters of the power grid, which affects the safety and efficiency of power generation and power supply equipment as well as the user's electrical equipment itself. Frequency represents the balance between supply and demand of grid active power. When the total generated power is greater than the total power consumption, the frequency will increase; otherwise, it will decrease. Various system emergencies (such as sudden switching in and out of large loads) will cause certain frequency changes. As the level of wind power penetration is gradually increasing, it is particularly important for wind farms to have the auxiliary ability to participate in power grid freque...

Claims

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Application Information

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IPC IPC(8): H02J3/48
CPCH02J3/386H02J3/48Y02E10/76
Inventor 彭超邹见效何建徐红兵刘淼
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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