【作者】 魏学森；

【导师】 刘志强；

【作者基本信息】 河北工业大学 ， 控制理论与控制工程， 2003， 硕士

【摘要】 感应电机的双馈调速系统具有调速性能好、低谐波污染、可靠性高及造价低廉等优点，特别适合于高电压、大功率且调速范围不大的场合，尤其适用于风机、泵类负载。另外，它还适用于风力、潮汐发电以及电网无功补偿领域。双馈电机调速技术的研究具有重要的意义。直接转矩控制是80年代中后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。把直接转矩控制思想应用于双馈调速领域，有着重要的研究意义。 本论文分析了双馈电机直接转矩的控制原理，主要以圆形转子磁链为主，提出了两种控制方案：转子电流最小工作方式的双馈电机直接转矩控制和可提高定子侧功率因数的直接转矩控制。在第一种控制方案中，通过施加转子电压矢量，使转子电流与转子磁链垂直，转子励磁全靠定子电流，即可保证转子电流和转子电压同相或反相，从而实现了转子侧功率因数为1，可减小转子侧变频器的容量。在第二种控制方案中，通过控制转子电压与转子磁链保持一定的角度，通过改变转子电压与转子磁链的夹角，即可改变定子侧功率因数。论文中对这两种控制方案进行了细致的推理，并通过仿真，进一步验证了两种控制方案理论的正确性及实际的可行性。 无速度传感器调速系统的研究已经成为现代传动领域一个重要的研究方向。人们研究出多种速度辨识方法，有文献指出，双馈电机一般采用直接法比较方便。本论文提出了转子电流定向的速度辨识方法，并且通过仿真、实验研究验证了本方法的正确性及实际的可行性。更多还原

【Abstract】 The doubly fed induction machines speed adjustment system has the advantage of good speed adjusting behavior, low harmonic pollution, high reliability and cheap productive price. Due to these characteristics, it is especially suitable for those situations with high voltage level, high power and not large speed adjustment range, such as wind machines and pump load. In addition it can be used in the situations of generating electricity by wind power and tide. So it is very important to study the doubly fed induction machines speed adjustment. Direct Torque Control (DTC) which was developed rapidly in the middle of 1980’s has been applied to many occasions up to now. It will be very important to apply the idea of DTC to the doubly fed induction machines speed adjustment.Based on the analysis of the control theory of the DTC of doubly fed induction machines, in this paper , two control schemes are proposed: the least mode of rotor current and the stator power factor adjustable mode. In the first control scheme , we may make the rotor voltage the same or opposite phase with the rotor current by throwing suitable rotor voltage vector. Therefore . the unit rotor power factor can be implemented. In the second scheme, the stator power factor can be improved by adjusting the angle between rotor voltage and rotor magnetic linkage. In the paper, the detailed reasoning about the two schemes is carried on by analysis and experiment.The study about speed sensorless has been a important research aspect in the field of electric drive. Many methods have been found out. Some people think that the direct method is the most suitable way to doubly fed induction machine. In this paper, a direct method based on fixing the rotor current is proposed. By the experiment, we can prove that the method is correct.更多还原