电气专业外文翻译--变频技术的发展(编辑修改稿)

电气专业外文翻译--变频技术的发展(编辑修改稿)内容摘要：

ating frequency conversion velocity modulation technique in our country has big disparity pares with international level. Therefore, the AC frequency variation speed control technique has the following sides: (1) The basic research of control strategy in frequency converter has a large gap pares with the foreign level. (2) The technical level of the whole machine is low in the frequency converter, although we had input certainly people, material resources, but because of the disperse power, did not form a certainly technique and production scale. (3) All the semiconductor power device product in the frequency converter is blank. (4) Correlative Industries and relative Industries drop behind. (5) Few production and sale, low reliable and technological standards. With the development and improvement in the power electronic technique, power divert based on power electronic circuit technique and various control technique, the AC frequency variation speed controlled technique is mature day by day, and sure to be the main way in the future. With the constant development of power electronic technique, reliable character, well adoption, cheap price that the frequency converter have will bee true. This technique will gain widely, popularity application .At present, foreign developed countries’ frequency convert technique towards to the miniaturization, high reliability, defend with harm, more function, high character, and our country is ing on now. 3. Frequency Variation Speed Controlled Mode The alternating frequency conversion velocity modulation technique obtained the rapid development in 20th century. This is related with some crucial technical which gain unprecedented progress, they are Motor vector control technique, Direct torque control technique, PWM technique, Entire numerical control technique and selfsetting technique 5 which based on microputer and large scale integrated circuit, and so on. (1) Vector Control Technique Vector transformation control technique is a one kind of new control thought and control theory which posed by SIEMENS CO. in 1971. It is realizing the stator current excitation ponent and the torque ponent solution lotus root by rotor magic field direction detection, and vector transformation, achieved the goal that separately control the motor flux linkage and the electric current, as a result, obtain finely static, dynamic performance. Until now, the vector control technique has obtained the considerable development, and also obtained the widespread application. (2) Vector Control Without Velocity Generator Technique Vector control without velocity generator technique abolish the problems that the environment patibility、 install and maintenance bring on, reduce the cost, enhance the system reliability, at the same time, union vector control, has the fine performance of vector control. The speed estimate method in vector control technique without velocity generator, besides basis mathematical model putation electric motor rotational speed, at present the more applied are the model to refer autoadapted method and expands the Kalman filtering law. In addition, entire Uygur rotor magic flux sight, tooth overtone electric potential, such as this theory and so on, also appearance in the vector control without velocity generator technique. Since 1983 proposed the vector control without velocity generator technique control strategy, receives the academic circles and the industrial field continuously highly focused all the time. Hitachi pany and Sichuan electrical machinery and so on had published the research results separately in 1987, and had promoted the product one after another. At present, vector control without velocity generator technique in frequency converter controlling in the velocity modulation scope is about 1:50, some individual merchant has 1:75 or even higher product. (3) Direct Torque Control Technique In1985, Germany39。 s M. Depenblock proposes the direct torque control technique（ DTC） for the first time， The direct torque control technique analyzes the motor mathematical model directly under the stator coordinate system. Uses the stator magic field direction detection but not to need the solution lotus root electric current， directly control the electric motor flux linkage and torque, enable the torque to obtain the fast response, in order to obtain the highly effective control performance. Direct torque control technique is another kind of new 、 high performance 6 alternating frequen。