| 1. | Variable speed constant frequency
变速恒频 |
| 2. | Closed - loop control of matrix converter used for variable speed constant frequency supply system
矩阵变换器在永磁交流伺服系统中的应用研究 |
| 3. | Sliding mode control during variable speed constant frequency doubly - fed wind generator no - load connecting electric grid
变速恒频双馈风力发电机空载并网滑模控制 |
| 4. | By use of electronic inverter , variable speed constant frequency ( vscf ) electrical generating system converts variable frequency ac power from generator to constant frequency ac power
变速恒频电源系统是通过电子变换器将发电机输出的变频交流电转换成为飞机用电设备所需的恒频交流电。 |
| 5. | 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。 |
| 6. | 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。 |
| 7. | 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。 |
| 8. | 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。 |
| 9. | Electronic inverter is widely used in variable speed constant frequency ( vscf ) electrical system , ups , and other kinds of power supplies . with the continuous development of pwm control strategy and digital signal processing technology , the method of the pwm control incline to digital control and then the pwm technique plays more and more important role on the dc - ac inverter control
逆变器在飞机变速恒频电源、 ups以及其他电源中具有很广泛的用途，随着pwm控制策略以及数字信号处理技术的不断发展，数字控制在逆变器控制方案中的价值也日益凸现。 |
| 10. | This paper is based on " mw variable speed constant frequency " . it has the design and the computation on hydraulic system of wind turbine . it realizes the automatic paint for hydraulic system by the autolisp language in autocad
本文以沈阳工业大学风能研究所正在进行的国家863项目“兆瓦级变速恒频风电机组”为基础，对兆瓦级风力发电机的液压系统部分进行了设计计算，并通过autocad的内嵌语言autolisp ，实现了兆瓦级风力机液压系统中变距液压缸部分的参数化自动绘图。 |
