One of them , as a new asynchronous motor control technique , the direct torque control ( dtc ) technique attracts more and more attention after space vector control technique because of its robust characteristics , simple realization and excellent dynamic response 其中直接转矩控制技术( dtc )作为继矢量变换控制之后发展起来的又一项新型现代交流电机控制技术，以其控制简单、鲁棒性强、动态性能好的优点得到了越来越广泛的重视。
In 1970 ' s , one method of ac induction motor control called direct torque control ( dtc ) was raised . it was developed rapidly in the middle of 1980 ' s , and it has been successfully applied to many occasions up to now . in this paper , the scheme is investigated thoroughly 直接转矩控制是20世纪70年代提出的，在80年代中期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。
Vector - contorl wvf system of asynchomous motor is a high performance speed - control system and has been used in a lot of situations of high precision and high performence . in the base of vector - control , some control methods are developing , for example speed - sensorlesss control and self - adaptation control 矢量变换控制的异步电动机变频调速系统是一种高性能的调速系统，已经在许多需要高精度、高性能的场合中得到应用。以矢量变换为基础的许多控制方法，诸如无速度传感器控制、自适应控制等正在发展中。
According to the space vector modulation method of the equivalent structure of the ac - dc - ac transformation , the transformation relations of the matrix converter are deeply investigated . the ac - ac direct conversion control and the double - space - vector pwm scheme of the matrix converter are deduced , the four - step current commutation strategy of matrix converter is expatiated , the design method of input filter and over voltage protection circuit is analyzed , and the modeling and simulation of a three - phase matrix converter are implemented 从等效交-直-交变换的空间矢量调制方法出发，深入分析了矩阵式变频器的变换关系，导出了交-交直接变换控制规律和双空间矢量脉宽调制技术，阐述了矩阵式变频器的换流控制策略，分析了输入滤波器和过电压保护电路的设计方法，实现了矩阵式变频器的建模和运行分析。
Besides these , it is capable of performing frequency conversion with sinusoidal output voltages and currents at the desired output frequency and allows bi - directional power flow according to the space vector modulation method of the equivalent structure of the ac - dc - ac conversion , the conversion relations of the matrix converter were deeply investigated . the ac - ac direct transformation control and the double - space - vector pwm scheme of the matrix converter were deduced and the modeling , sin ~ iu1ation and experiment of a three - phase matrix converter were implemented 本文从等效交一直一交变换的空间矢量调制方法出发，深入分析了矩阵式变换器的变换关系，推导出了交一交直接变换控制规律和双空间矢量pwm调制技术，实现了交一交直接变换控制方式下矩阵式变换器的建模和运行分析，并进行了计算机仿真和实验研究。
Combined with the advantages of matrix converter , ac - excited generation technique and vector control scheme , the stator flux - oriented vector control model of the variable - speed constant - frequency ( vs cf ) ac - excited generator fed by a matrix converter was developed . simulation studies of the proposed power generation system were carried out 本文还结合了矩阵式变换器、交流励磁发电技术和矢量控制的优点，建立了矩阵式变换器供电的变速恒频交流励磁风力发电机定子磁场定向的矢量变换控制系统模型，对矩阵式变换器在交流励磁发电系统中应用进行了仿真研究。
Space vector control according as ac induction motor two - axis theory speed separates the stator current into two components . one is the torque component ; the other is the flux component . a structure similar a dc machine structure where torque and field can be controlled independently is given 矢量变换控制是以交流电动机的双轴理论为依据，在同步旋转坐标系中把定子电流矢量分解为两个分量：一个分量与转子磁链矢量重合，称为励磁电流分量；另一个分量与转子磁链矢量垂直，称为转矩电流分量。
