Active DFIG scheduling method based on maximal reactive power margin of wind power plant

Abstract

The invention discloses an active DFIG scheduling method based on the maximal reactive power margin of a wind power plant. The method comprises that set parameters, prediction data and a scheduling instruction PD of each DFIG in the wind power plant are obtained; a predicted active output value of each DFIG is calculated by combining a dynamic model of a wind mill; upper and lower limits of reactive output of each DFIG are calculated by combining reactive output characteristic of the DFIG; when an active output predicted value PF_sigma of the wind power plant is lower than the scheduling instruction PD, each DFIG generates power according to a maximal wind energy tracking principle; and when the active output predicted value PF_sigma of the wind power plant is greater than the scheduling instruction PD, a control strategy of successive distribution is adopted to schedule and distribute the active output of each DFIG in a unified way by taking maximizing the reactive power margin of thewind power plant as a control target.

Description

technical field [0001] The invention belongs to the technical field of wind farm operation control, in particular to a DFIG active power scheduling method based on the largest wind farm reactive power margin. Background technique [0002] With the increasing installed capacity of large-scale wind farms, the control of active power and reactive power inside wind farms is becoming increasingly complex, and there is a mutual coupling relationship between the control sequence, control objects, and control objectives of each function. [0003] The traditional active power control of the wind farm takes the maximum active power output of the wind farm as the control target, and the reactive power control takes the minimum voltage deviation of the grid-connected point of the wind farm as the control target, without considering the coordinated control of active power and reactive power, let alone making full use of DFIG Reactive power generation capability. Therefore, it is of grea...

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Problems solved by technology

[0003]The traditional active power control of wind farms takes the maximum active power output of the wind farm as the control target, and the reactive power control takes the minimum voltage deviation of the wind farm grid-connected point as the control target, without considering active power , Coordination and control of reactive power, and the reactive power generation ability of DFIG is not fully utilized

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