The characteristics of wind turbine generators as well as features of the fixed pitch wind turbine generator and the variable pitch wind turbine generator are presented , emphasizing on the variable speed constant frequency ( vscf ) generating system based on doubly - fed generators and on the control system for pitch angles 在简述风力机特性的基础上，介绍了定桨距和变桨距发电机组的特点，重点分析了基于双馈发电机的变速恒频发电系统及桨叶节距角控制系统。
Today , mw wind generators substitute 600kw generators gradually and become the popular units of international market of wind power generation . the trends of units are variable speed constant frequency and large - scale and pitch control . there are many different generators which are variable speed constant frequency generator . in this paper the unit is fully - fed magnet wind turbine generator . the magnet wind turbine generator grid - connected inverter is the key component of connected system . the main function of this component is inverting the dc to three - level volage and connecting the electric net 实现变速恒频发电的方法众多,本文研究的是较常用的一种方案。该方案采用直驱永磁风力发电机通过变频器直接连接到电网。永磁风力发电机并网逆变器是并网发电系统的核心部分,其主要功能是将经过整流、斩波升压后的直流电逆变成三相交流电,并送入电网,实现并网。
The thesis discusses principle issues of the bdfg system such as mathematical modal , control strategy and the simulation of its steady operations , etc . by the theoretical analysis , computer simulation and experimental investigation , some valuable experiences and significant conclusions are given , which found the basis of the project for the further studies 本文不仅对级联式无刷双馈风力发电机进行了基础性的建模与仿真研究，还建立了一套适于实验室研究使用的风力发电实验系统，并提出了级联式无刷双馈风力发电机进行变速恒频发电的控制策略。
The paper has done all - around study on the ac excited of variable - speed constant - frequency ( vscf ) wind power generation . the author has done thorough study on the vscf wind power generation technology using wound - rotor doubly - fed induction generator , from simulation to experiment , from theory to practice . he also did at large theory analysis to the vscf wind power generation technology using cascaded brushless doubly - fed generator , and has established stability theoretical foundation for continue study work 本文对交流励磁变速恒频风力发电领域的关键技术进行了较为全面的从仿真到实验、从理论到实践的深入研究，同时对具有广泛潜在应用前景的级联式无刷双馈发电机变速恒频风力发电技术也进行了洋尽地理论分析，为今后进一步的深入研究奠定了一定的理论基础。
