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Generalized load modeling method for distribution network containing direct-drive permanent magnet wind farm

A generalized load and modeling method technology, applied in the field of power system modeling, can solve the problems of large number of parameters to be identified, redundant model parameters, high model order, etc., and achieve simplified model structure, high identification accuracy, and simple structure Effect

Inactive Publication Date: 2016-10-26
HOHAI UNIV
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Problems solved by technology

[0003] Some of the existing generalized load equivalent models including wind power generation are too simplified to reflect the dynamic characteristics of the generalized load and have large errors
Some are too complex, with the disadvantages of high model order, large number of parameters to be identified, and redundant model parameters

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  • Generalized load modeling method for distribution network containing direct-drive permanent magnet wind farm
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  • Generalized load modeling method for distribution network containing direct-drive permanent magnet wind farm

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0036] The present invention is set forth in detail below in conjunction with embodiment:

[0037] Step 1) Propose a simplified model of the direct drive permanent magnet wind turbine, see figure 2 shown.

[0038] figure 2 Medium, P ref and Q ref They are active power and reactive power set values ​​respectively, and their values ​​are determined by two methods, one is directly issued by the wind farm station-level control system, and the other is determined by the operating status of the direct-drive permanent magnet wind turbine. P, Q, U and θ are the active power, reactive power, terminal voltage amplitude and power factor angle of the wind turbine, respectively. are the proportional...

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Abstract

The invention discloses a generalized load modeling method for a distribution network containing a direct-drive permanent magnet wind farm. A simplified model of a direct-drive permanent magnet synchronous generator (DDPMSG) is proposed, and the direct-drive permanent magnet synchronous generator is connected in parallel with a traditional load to be used as a distribution network generalized load model structure containing a direct-drive permanent magnet wind farm. Based on a trajectory sensitivity method, the identifiability and identification difficulty of the parameters in the generalized load are analyzed. For parameter identification, global optimization is performed first using a particle swarm optimization (PSO) algorithm, and then, local optimization is performed on the basis of the PSO result using a Levenberg-Marquardt (LM) algorithm. The model structure of the direct-drive permanent magnet synchronous generator is simplified, and the proposed parameter identification method is of high precision. The modeling method can provide reference for generalized load modeling of other renewable energy access distribution networks containing a full-bridge converter.

Description

technical field [0001] The invention relates to a generalized load modeling method of a distribution network including a direct-drive permanent magnet wind farm, and belongs to the technical field of power system modeling. Background technique [0002] A large number of distributed power sources mainly based on renewable energy are connected to the distribution network in a decentralized manner. Traditional load models cannot describe the dynamic characteristics of generalized loads including distributed power sources. Therefore, it is necessary to study the structure and parameter identification of generalized load models containing distributed power sources. method. Wind power is the renewable energy with the most development and utilization prospects in the near future. To study the generalized load model including wind power, the first task is to establish the model of the wind turbine itself and understand its dynamic characteristics. [0003] Some of the existing gene...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 潘学萍冯徐徐鞠平吴峰金宇清
Owner HOHAI UNIV
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