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Reactive power optimization control method for large-scale double-fed wind power plant

A double-fed wind farm, optimization control technology, applied in wind power generation, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problem of long optimization cycle

Active Publication Date: 2020-11-24
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the wind power changes greatly, directly using the optimization algorithm to allocate the reactive power of the units, and taking the reactive power of all fans as the optimization variable of the algorithm will lead to a long optimization period, and the optimal value of the reactive power of the fans obtained by optimization will no longer be Suitable for existing wind speed

Method used

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  • Reactive power optimization control method for large-scale double-fed wind power plant
  • Reactive power optimization control method for large-scale double-fed wind power plant
  • Reactive power optimization control method for large-scale double-fed wind power plant

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Embodiment Construction

[0052] figure 1 It is a flow chart of reactive power control strategy grouped by large-scale doubly-fed wind farms. The following is combined with the attached figure 2 The wind farm simulation of the present invention is described in further detail.

[0053] Example parameter description:

[0054] In this case, there are two feeders in the wind farm, and each feeder has 10 double-fed fans. The distance between the fans is 4km, and the simulation time is 600s. The specific parameters of the wind farm are as follows:

[0055] parameter actual value Pu Fan rated mechanical power 5MW 0.05p.u. Stator rated phase voltage 690V 0.017p.u. Stator resistance, R s

1.552mΩ 0.000142 p.u. Rotor resistance, R r

1.446mΩ 0.000133 p.u. Stator reactance, X s

2.033Ω 0.1867p.u. Exciting reactance, X m

1.733Ω 0.1591 p.u. Wind farm rated capacity, S WF

100MVA 1.0 p.u. Reference impedance, Z B

...

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Abstract

The invention discloses a reactive power optimization control method for a large-scale doubly-fed wind power plant. The method comprises the following steps: grouping fans; establishing a target function by taking the maximum total active power output by the wind power plant as a target; calculating upper and lower limits of reactive power output of each doubly-fed fan unit in combination with reactive power output characteristics of the doubly-fed fans; establishing a constraint condition function by taking reactive output upper and lower limits of the doubly-fed fan unit, voltage deviation of each node of the wind power plant and a reactive scheduling instruction of the power grid to the wind power plant as constraint conditions; and solving an optimization model composed of the optimization objective function and the constraint conditions by adopting a grouping reactive power optimization control strategy to form the wind power plant reactive power control method meeting the requirements.

Description

technical field [0001] The invention belongs to the technical field of wind farm operation control, and in particular relates to a reactive power optimization control method for a large double-fed wind farm. Background technique [0002] With the decline of global non-renewable energy reserves and the increasingly severe environmental pollution problems, the development and utilization of new energy represented by wind energy has become an irresistible trend. More and more large-scale wind farms are integrated into the power system, and the power grid has higher and higher requirements for wind farms. Reactive power control has become an important issue currently. At present, doubly-fed induction fans are widely used in wind farms. Doubly-fed fans have high controllability, small converter capacity and fast reactive power adjustment speed. Not only that, the DFIG can also decouple active and reactive power separately, so the DFIG itself has the ability to adjust reactive po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/50H02J3/38H02J3/18
CPCH02J3/466H02J3/50H02J3/381H02J3/18H02J3/1885H02J2300/28H02J2203/10Y02E10/76Y02E40/30
Inventor 荣飞宁晓洁许晓玥朱语博刘诚
Owner HUNAN UNIV
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