Wind field participation frequency modulation method and system

Abstract

The embodiment of the invention provides a wind field participation frequency modulation method and system. The method comprises the steps: performing the control of kinetic energy of a wind power generator set rotor and the power standby frequency modulation control; building a comprehensive frequency modulation control strategy of each wind motor under different wind speeds; building a quantified calculation relation among wind speed, wind power field deloading total power and each wind motor deloading power based on a variable parameter deloading power coordinative distribution coefficientof the wind speed; and obtaining the output of each wind power generator set after deloading distribution. According to the embodiment of the invention, the method gives full consideration to the impact on the frequency modulation capability of the whole wind power plant from the internal deloading power distribution of the wind field, achieves the coordinative distribution of the output of each wind motor, is suitable for the wind speed distribution difference between the wind power generator sets in a cluster wind power plant, and gives full play to the frequency modulation capability of thewind power plant.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of wind power generation control, in particular to a method and system for wind farms to participate in frequency regulation. Background technique [0002] From January to June 2018, China's new installed capacity of wind power was about 7.53 million kilowatts, an increase of 1.52 million kilowatts over last year, a year-on-year increase of 25%. Different from conventional synchronous generators, most wind turbines are connected to the grid using power electronic converters, which decouples the output of the wind turbines from the system frequency. At the same time, the wind turbines adopt the maximum power point tracking (MPPT) control mode, which cannot respond to the power grid. frequency changes, lack of frequency adjustment capability. [0003] Therefore, a large number of wind turbines connected to the grid will reduce the system frequency stability. [0004] In order to imp...

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Problems solved by technology

[0005] However, although the research on the frequency modulation control strategy at the wind turbine level has become mature, on the issue of power distribution among units in a wind farm, the current research mostly deals with the simple unified treatment of wind speed, without considering the difference in wind speed between units

[0006] In actual operation, the internal operating conditions of the wind farm are complex. Due to factors such as the local geographical distribution of wind speed in the wind farm, the wake effect of the wind turbine, and the specific topographical differences of the location of the wind turbine, the wind speed of different units varies greatly, even up to 50%. If the difference in wind speed is not considered, it will be difficult to exert the frequency modulation capability of a single wind turbine, which will affect the frequency modulation control of the wind farm

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