摘  要：介绍了测功机的主要种类，并选择利用变频器与异步电机实现异步电力测功机的方案。分析了共用直流母线的两种不同方式，并选择共用直流均衡母线的方式把两台变频器的直流母线并联以实现能量的回馈利用。介绍了直接转矩控制的基本原理，并利用直接转矩方式来实现对异步电机的控制，在此基础上，通过采用直接转矩控制方式对测功机系统进行了大量的仿真研究，验证可知该异步电力测功机系统具有良好的动、静态性能，并达到了能量回馈的目的。
关键词：测功机；变频器；异步电机；能量回馈

Abstract: Introduced the main type of the dynamometer,and presented a scheme of dynamometer which used the frequency converter and induction motor.Analysed the shared DC bus of the two different ways and chose the shared DC bus balanced manner to realize the use of energy feedback,and let the DC bus of frequency converter to implement the energy recycling.Introduced the direct torque control of the basic principles,and took advantage of ways to achieve direct torque on induction motor control.On this basis,through the use of direct torque control methods on the dynamometer system for a large number of simulation studies,Found the verification of asynchronous power dynamometer system had good dynamic and static performance,and achieved the purpose of the energy feedback.
Key Words: Dynamometer;Frequency converter;Induction motor;Energy recycling