A reactive power optimal control method for large-scale doubly-fed wind farms

A doubly-fed wind farm, optimized control technology, applied in wind power generation, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problem of long optimization period, to meet the grid reactive power scheduling, reduce impact, The effect of increasing active power

Active Publication Date: 2022-02-15
HUNAN UNIV
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  • Abstract
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  • 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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  • A reactive power optimal control method for large-scale doubly-fed wind farms
  • A reactive power optimal control method for large-scale doubly-fed wind farms
  • A reactive power optimal control method for large-scale doubly-fed wind farms

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Experimental program
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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, 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 0.05 p.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 1.0p.u. Reference impedance, Z B

10....

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Abstract

The invention discloses a reactive power optimization control method for a large double-fed wind farm, which includes: grouping the wind turbines; establishing an objective function with the maximum total active power output by the wind farm; The upper and lower limits of the reactive power output of a double-fed fan unit; the upper and lower limits of the reactive power output of the double-fed fan unit, the voltage deviation of each node of the wind farm, and the reactive power dispatching command of the power grid to the wind farm are used as constraints to establish a constraint function; The reactive power optimization control strategy solves the optimization model composed of the optimization objective function and the constraint conditions to form a reactive power control method for wind farms that meets 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 Patents(China)
IPC IPC(8): H02J3/46H02J3/50H02J3/38H02J3/18
CPCH02J3/466H02J3/50H02J3/381H02J3/18H02J3/1885H02J2300/28H02J2203/10Y02E10/76Y02E40/30
Inventor 周诗嘉荣飞宁晓洁许晓玥朱语博刘诚
Owner HUNAN UNIV
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