基于间接功率控制的无刷双馈风力发电机组多类型故障的无Crowbar低电压穿越方法

项目名称： 基于间接功率控制的无刷双馈风力发电机组多类型故障的无Crowbar低电压穿越方法

项目编号： No.51477110

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 张爱玲

作者单位： 太原理工大学

项目金额： 87万元

中文摘要： 随着兆瓦级变速恒频风力发电系统中有刷双馈发电机故障率的日益增多，人们对双馈电机的无刷化充满期待。无刷双馈电机无需电刷和滑环，结构简单，可靠性高，所需变频器容量小，特别适合作为风力发电机使用。近年来，长期困扰国内外学者的无刷双馈电机的效率问题取得重大突破，在变速恒频风力发电领域逐渐显现出广阔的应用前景。本项目围绕无刷双馈风力发电机电网电压跌落故障下的行为特性及低电压穿越控制方法展开研究，具体内容包括：1、电网对称及不对称电压跌落情况下无刷双馈风力发电机故障暂态特性分析。2、提出一种基于间接功率控制策略的磁链跟踪的低电压故障穿越方法。该方法在故障期间控制控制绕组的磁链跟踪功率绕组磁链，实现对机组的保护。优点是①低电压穿越期间电磁转矩小，减小风电机组机械系统的扭切应力冲击；②适用于对称及不对称各种低电压故障；③无需增加硬件。3、提出基于间接功率控制策略的无刷双馈风力发电机空载并网策略。

中文关键词： 无刷双馈风力发电机；间接功率控制；低电压穿越；柔性并网

英文摘要： With the increasing failure rate of doubly-fed machine in megawatt of variable speed constant frequency wind power generation system, the brushless doubly-fed machine is highly anticipated. The brushless doubly-fed machine operates without brush and slip ring, it has simple structure and high reliability, the capacity of corresponding converter is small, which especially suitable for using as wind power generator. In recent years, the problem of efficiency of brushless doubly-fed machine which plagues the domestic and foreign scholars for a long time has made a significant breakthrough, and gradually shows broad application prospects in variable speed constant frequency wind power generation system. Focusing on the behavior characteristic of brushless doubly-fed wind power generator when grid symmetrical and asymmetrical voltage drop and the low voltage ride through control strategy, the concrete content of this project includes: 1. The brushless doubly-fed wind power generator fault transient characteristics analysis when grid symmetrical and asymmetrical voltage drop. 2. A flux tracking method of low voltage ride through of brushless doubly-fed wind power generator based on indirect power control strategy under the symmetry and asymmetry fault of the grid is proposed, which can control the flux of control winding tracking power winding flux during the fault to protect wind generating set. The advantage of this method is (1) The torque is low during low voltage ride through so as to reduce the impact the torsion shear of wind generating set; (2) It suitable for symmetric and asymmetric low voltage faults; (3) Without increasing the hardware. 3. The idle load grid-connection strategy of brushless doubly-fed wind power generator which based on indirect power control strategy is proposed to achieve the flexible grid-connection; the theoretical foundation is provided for practical engineering application of brushless doubly-fed wind power generator by this research.

英文关键词： brushless doubly-fed wind power generator;indirect power control;low voltage ride through;flexible grid-connection