风机基本工作原理和电能变换系统

综述了风机电能变换系统.首先论述了实现风机能量变换的基础,考虑了电气系统的需求.然后描述了3种变换系统(恒速、变速双馈式异步发电机和变速直驱式发电机)的优点和缺点.其次简单叙述了所应用的电力电子变换器.最后,讨论了可选择的发电机系统和其发展趋势.发展趋势很明显倾向于变速系统.越来越多的双馈式异步发电机系统安装了应对电网故障的装置.对于直驱式风机,径向永磁同步发电机比电励磁同步发电机更便宜且效率更高.发电机的电压等级可期望提高到约5 kV.

Basic Operation Principles and Electrical Conversion Systems of Wind Turbine

This paper gives an overview of electrical conversion systems for wind turbines.First , the basics of wind energy conversionwith wind turbines are reviewed and requirements with respect to the electric system are considered. Next , the three classical conversionsystems are described with their strengths and weaknesses:constant speed, variable speed with doubly-fed induction generator and variablespeed with direct -drive generator.The applied power electronic convertersare shortly addressed. Finally, alternative generator systems andtrends are discussed. There is a clear trend towards variable speed systems. Doubly-fed induction generator systems are increasingly equippedwith grid fault ride through capabilities. For direct-drive turbines, the radial flux permanent-magnet synchronous generator is cheaper and moreefficient than the electrically excited synchronous generator. It is expected that the voltage level of generators will increase up to values in theorder of 5 kV.