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。
With the development of power electrical technology and power element product technics , vscf generating system has better foreground and more broad scope of development . and power inverter , which has important effect on the whole generating system , is the core of vscf generating system 在交直交型变速恒频电源系统中，功率变换器将直流电转变为恒频恒压交流电为飞机用电设备供电，其工作状况直接关系到整个变速恒频电源的系统性能，因此是变速恒频电源系统的核心组成部分。
Thus , objective of this project is to improve the functionality and efficiency , and mitigate the drawbacks of a variable speed generation system or asg ( adjustable speed generator ) in conjunction with a dfig ( double fed induction generator ) , which is frequently named as variable - speed / constant frequency ( vscf ) generation system 本文的研究目的是改进双馈电机变速发电系统或变速驱动系统的的功能和效率,减轻系统缺陷所带来的危害。双馈电机变速发电系统通常又称为变速恒频发电系统( vscf - variablespeedconstantfrequency ) 。
Recently , the renewable energy such as wind power have been strongly encouraged because of environmental problem and shortage of traditional energy sources in the near future . based on the tradional consrant speed constant frequency wind energy generation , this paper has a focus on the variable speed constant frequency wind energy convertion technonogy which using direct drive permanent magnet synchnonous generator and theory analysis and simulation are carried out in detail 当今对可再生能源的开发利用中,风能由于其突出的优点而成为研究的热点,风力发电是我国能源和电力可持续发展战略的最现实选择。目前各种风力发电技术的发展方兴未艾,而其中变速恒频风力发电技术因其高效性和实用性正受到越来越多的重视。
Just based on the two points mentioned above , a control system of doubly - fed variable speed constant frequency ( vscf ) wind power generator based on 8xc196mc is designed in this paper , which can smoothly transform between the different operational modes from sub - synchronous speed to synchronous speed and to super - synchronous speed 正是基于上述两个出发点，本文设计了一台基于8xc196mc单片机的2 . 8kw变速恒频双馈风能发电控制系统。主电路中变流器的设计可使该系统能工作于亚同步速、同步速及超同步速三种运行状态，并具有能量双向流动的特点。
Secondly , to achieve the independent regulation of active and reactive power output from the generator side which is designed for the purpose of tracing the maximum wind - energy capturing . the paper has analyzed the mathematic model of the ac excited doubly - fed machine and the stator field orientation control strategy of the motor as vscf wind power generator . thirdly , it has put forward and designed the dual pwm converter with the capacity of energy flowing bidirectional aimed at the demand of rotor energy bidirectional flow . the author constructed reliable and integrated experimental system and did a series of experimental study including no - load , cutting - in network and power generation at , below and above the synchronous speed 论文首先分析了风机运行特性及其最佳风能利用原理，通过仿真及实验验证了采用直流电机的输出特性模拟风力机的最大输出功率曲线的可行性，并给出了模拟系统的硬件结构；然后为了实现交流励磁发电机有功、无功功率独立调节机理，分析了交流励磁双馈发电机的数学模型和在追踪最大风能捕获变速恒频风力发电时必需的定子磁链定向矢量控制策略；针对双馈发电机转子能量双向流动的要求，提出并设计了具有能量双向流动能力的双pwm交流励磁用变频器；最后为实现从理论到实践的全面研究，研制出了一套小功率完整的双pwm变频器交流励磁的双馈风力发电机实验系统，进行了空载、并网、同步速及上、下的发电运行等一系列的运行实验；所完成的仿真和实验研究均验证了理论、模型和控制策略的正确性、可行性。
We discussed the four - legged inverter with space vector modulation ( svm ) to aim at three - phase four - line output ; we introduced the principle of three dimensions svm , and attained the related control scheme . with the illustration of 15kva vscf power inverter , we tested and verified that the inverter system under 3d svm control can realize the three phase four line output and linear voltage regulating 针对三相四线输出的电源系统，对采用空间矢量控制的四桥臂逆变器进行了深入研究，对三维空间矢量调制方案进行了分析求解、仿真，并给出了适用于15kva变速恒频电源变换器的解决方案，实现了变换器的三相四线输出以及线性调压。
It also builds the mathematic model of all section of vscf ac exited wind power generation system on a - b - b and d - q coordinate system by the coordinate commutation technology . the thesis gives the characteristics of torque , active power , reactive power and the steady - state analysis of it . it proves that the capability of wind generator is determined to slip , the amplitude and phase of rotor voltage , the phase dispatch between stator voltage and rotor voltage 并分析了交流励磁风力发电机作变速恒频运行时的工作原理，阐述了与同步发电机、异步发电机的不同之处，分析了其能量平衡关系，在坐标变换技术的帮助下，详细推导了交流励磁发电机在a - b - c坐标系和d - q坐标系下的数学模型，分析并仿真了其有功和无功特性、转矩和功率调节特性、稳态运行和机械特性，证明了发电机的性能由转差率、转子电压的相位和幅值、定转子电压相位差所决定的。
