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论文摘要内容

题名:

 风电机组接入电力系统小干扰稳定性的实用性研究

作者:

 吴瀚俊

语种:

 chi

学科:

 电气工程

学位:

 工程硕士

学校:

 南京工程学院

院系:

 电力工程学院

专业:

 电气工程

导师姓名:

 刘海涛

完成日期:

 2015-03-10

题目(外文):

 Practical research on small signal stability of power system with wind turbine generator

关键字(中文):

 恒频恒速 双馈 直驱永磁 模型 小干扰稳定

关键字(外文):

 constant speed constant frequency doubly-fed PMSG model small signal stability

文摘:

 

近年来风电迅速发展使得风电在现代电力系统里所占的比重越来越大,大规模风电的并网必将对整个电力系统的运行与控制产生重大的影响,由此带来的电力系统稳定性问题也变得日益突出,本文研究了三种风力发电机组并网后的小干扰稳定性。

研究风力机的机械环节,分别针对桨距角及控制系统、连接风力机和桨距角的轴系系统进行了理论推导和数学建模。考虑风力机的机械环节和普通异步发电机的电磁暂态过程,建立了恒频恒速风电机组接入电力系统小干扰稳定分析的线性化模型。考虑风力机的机械环节和发电机电磁暂态过程以及变频器的模型,建立了双馈感应和直驱永磁同步风电机组接入电力系统小干扰稳定分析的线性化模型。

采用特征值分析法研究恒频恒速风电机组、双馈感应风电机组和直驱永磁同步风电机组并入简单电力系统时的小干扰稳定性,分析表明:三种风电机组接入简单系统都是小干扰稳定的,并且恒频恒速风电机组相较其他两种风电机组接入简单系统具有更好的小干扰稳定性。

采用时域仿真法研究恒速风电机组和双馈感应风电机组接入电力系统的小干扰稳定性,其中复杂系统采用美国西部电网WSCC三机九节点经典网络。分析表明:无论是简单电力系统还是复杂系统中接入恒频恒速风电机组,在小干扰下均在10s内达到了稳定;对于双馈感应风电机组,均在大约30s内达到了稳定。并且随着风电机组容量的增大和输电线路距离的增加,其稳定性略有下降。

以云南某地区实际电网为工程研究对象,采用时域仿真法分析双馈感应风电机组接入时小干扰稳定性,对扰动点变换的情况以及经长距离并增加风机容量的情况下分别予以分析:分析表明,双馈感应风电机组接入云南某地区实际电网具有较好的稳定性,并且随着风电机组容量的增大和输电线路距离的增加,其稳定性略有下降。

 

关键词:恒频恒速;双馈;直驱永磁;模型;小干扰稳定

文摘(外文):

 

The rapid development of wind power in recent years, making wind power being the proportion of large scale,While the wind power connecting to network will have a significant impact on the operation and control of the entire power system, and what causes the stability problems of power system have also drawed much attention. Small signal stability of power system with Three typical wind turbine were studied in the paper.

A mechanic modle of wind turbine has been established, which includes model of aero-dynamic,shaft and pitch angle with control system,by theoretical analysis and mathematical modeling.

Considering wind turbine mechanical links and common electromagnetic induction generator transient process, model,of a constant frequency Fixed speed wind turbines were established to get access to the power system with small signal stability analysis.Then considering wind turbine mechanical links,common electromagnetic induction generator transient process and inverter, model,of DFIG,PMSG were established to get access to the power system with small signal stability analysis , Eigenvalue analysis of wind turbine of single wind turbine systems were illustrated to prove its good small signal stability.

Time domain methods were used to study small signal stability of constant frequency Fixed speed wind turbines and DFIG.With analysis of complex systems of the access to the US west grid of nine three-machine network nodes classic simulation,constant frequency Fixed speed wind turbines of all the system have reached a stable in the 10s. DFIG wind turbines reached a stable in 30s.

The actual grid in an area of Yunnan to the original object of analysis were occupied,setting up a ground fault in the access of doubly-fed induction wind turbine, the system prove its good small signal stability. And with increasing distance from the transmission line capacity, stability of the overall system slightly drop down.

 

Key words: constant speed constant frequency;doubly-fed;PMSG;model;small signal stability

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 2018-07-01

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