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。
The technology of wind power are introduced in this paper including the power capacity , the main drive mode of wind generator and the way of power control , the characteristics of cscf and vscf are analyzed , the control method of fixed pitch and variable pitch and variable speed and the robust non - linear of intellectual control methods are expatiated 摘要介绍了当前风力发电机的主要驱动方式和风力机的功率调节方式，阐述了恒速恒频、变速恒频发电技术的特点，论述了具有鲁棒性的非线性智能控制技术在风力发电中的应用。
The main technological characteristics include not only the integrated optimizing design of variable speed and constant frequency , ensuring the wind turbines to adapt to diversified wind plants with different temperatures and geographical conditions , but also the maximum wind power captured at optimized tip speed ratio below the rated wind speed and security protection of constant power output above the rated wind speed by variable pitch regulation 主要技术特点是整体综合优化设计、变速恒频运行、适合不同气候特点和地理环境的风电场；风机全翼展变浆距功率调节、额定风速以下最佳变速比运行最大风能捕获、额定风速以上恒功率输出具有安全保护功能。
Firstly . operation principle of induction heating is introduced and the actuality of the power supply for induction heating is summarized . then , the scheme of structure of the power supply is established : uncontrolled rectifier and buck chopper constitute dc circuit . in this part , operation principle of a kind of soft switching buck chopper is presented mainly and the conclusion that the power semiconductor devices operate in soft switching is also illustrated by analysing the operation principle of all stages ; series resonant inverter is selected as inverter circuit via comparing the advantage and shortcoming of parallel resonant and series resonant . moreover . the work principle of series resonant inverter is analysed and the calculating method of the best dead time is put forward as well 文中首先介绍了感应加热电源的工作原理并综述了国内外的研究现状。接下来分析并制定了电源主电路的构成方案：在对比几种功率调节方式的基础上选择了不控整流加斩波调压作为直流部分。在这部分里，重点研究了一种软开关buck变换器，通过分析各阶段的工作原理说明了开关器件如何工作在软开关状态；对于逆变器部分，在比较了串、并联逆变器优缺点的基础上选择了串联谐振逆变器，并详细分析了串联逆变器的工作原理，提出了最佳死区的计算方法。
It " s very necessary to design and utilize the drive circuit of high frequency power mosfet , power regulation circuit and frequency - tracing circuit as three very important parts in control system of induction heating power supply . all those provide some experience for the designing and debugging of electrical source , reducing the cost and advancing efficiency 本课题就是基于这种需要，研究高频( 1mhz 3mhz )情况下采用功率mosfet为主开关器件的串联逆变电源的频率跟踪控制电路，因此高频情况下功率mosfet的驱动电路、频率跟踪电路以及功率调节电路等成为主要的研究对象，这些为以后电源装置的设计调试、减少器件成本及提高工作效率提供良好的前期准备。
This paper select the series - resonant inverter because it is more suited to high frequency power supply and it will be easy to enhance power capacity and enable the power supply to work on higher frequency if power is regulated in the rectifier . so uncontrolled rectifier and buck chopper constitute dc circuit is selected as rectifier circuit 并分析了感应加热电源的各种调功方式，在对比几种功率调节方式的基础上，得出在整流侧调功有利于高频感应加热电源频率和功率的提高，选择了不控整流加斩波器调压作为研究对象。
