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A wind farm dynamic equivalence method based on homogeneous generator clustering

A dynamic equivalent and wind farm technology, applied in the field of value, can solve the problem of reduced accuracy of the equivalent model

Active Publication Date: 2019-03-01
NANJING UNIV OF SCI & TECH +1
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Problems solved by technology

The traditional wind farm equivalent method does not consider the influence of terrain factors, and there are the following problems: under the influence of complex terrain, the wake effect caused by the irregular arrangement of units in the field, and the accuracy of the equivalent model caused by the impedance of the collector line decreases

Method used

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  • A wind farm dynamic equivalence method based on homogeneous generator clustering
  • A wind farm dynamic equivalence method based on homogeneous generator clustering
  • A wind farm dynamic equivalence method based on homogeneous generator clustering

Examples

Experimental program
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Embodiment

[0110] Taking a large wind farm in a mountain area as an example, the site selection and modeling are completed in the wind resource management software WAsP as follows: image 3 shown. It includes 4 collector lines and 16 double-fed generator sets, each of which is connected to the collector network through a step-up transformer at the machine end, and every 4 generators are connected to a group of feeders as a group. The 4 feeders are connected to the PCC bus, and then connected to the infinite system through two step-up transformers through double-circuit lines.

[0111] The system parameters are as follows:

[0112] All wind turbines adopt Bonus 1.5MW double-fed type, the machine-end transformer ratio is 575V / 25kV, the feeder cable resistance is 0.1153Ω / km, and the reactance is 0.3958Ω / km. It is assumed that the wind turbines WT1~WT8 adopt a constant power factor control strategy , WT9~WT16 adopt constant voltage control strategy; the unit connection method is as follows...

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Abstract

The invention discloses a wind farm dynamic equivalence method based on homogeneous generator clustering. The method is as follows: modeling the distribution of environmental wind speed; the wake effect model is established according to the interaction of input wind speed when the units are irregularly arranged. Aiming at the units with irregular arrangement, the influence of unequal length of connecting cables on the dynamic characteristics is analyzed. The characteristic equation of doubly-fed wind turbine electromagnetic system is solved, the dominant mode of the equation is analyzed, and the basis of homology is discriminated. Taking the characteristic quantities obtained from the homology discrimination as the basis of wind turbine group classification, the wind turbine group in the field is classified by using hierarchical clustering algorithm. Based on the clustering results, the capacity weighting method is used to calculate the parameters of the equivalent units. The inventionsolves the wake effect caused by irregular arrangement of generating units in the field under the influence of complex terrain, and the problem of low precision of equivalent model caused by currentcollector line impedance, reduces the power error of steady state and dynamic simulation, and is suitable for establishing the wind farm equivalent model.

Description

technical field [0001] The invention belongs to the technical field of wind farm modeling, in particular to a dynamic equivalence method for wind farms based on coherent unit groups. Background technique [0002] At present, there is a trend of large-scale development of wind power generation in the world. With the large-scale development and the improvement of the localization rate, MW-level wind turbines are widely used in the industry. There are more and more large-scale wind farms consisting of dozens or even hundreds of wind turbines. The internal structure of wind farms is very complicated. How to reasonably and efficiently Modeling, analysis and calculation of wind farms has become an important topic. [0003] For large-scale wind farms, when people study their grid-connected characteristics, they pay more attention to their output characteristics as a whole, rather than the specific conditions of each unit. If a detailed model for each unit is used , will increase ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/20G06F18/231
Inventor 郑文哲卜京涂杉杉焦永辉周前张宁宇汪成根刘建坤
Owner NANJING UNIV OF SCI & TECH
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