AC motors, especially the squirrel cage induction motors have the advantages of simple structure, good reliability and low cost. They are more suitable to be used as electrical dynamometers to provide dynamic load for...AC motors, especially the squirrel cage induction motors have the advantages of simple structure, good reliability and low cost. They are more suitable to be used as electrical dynamometers to provide dynamic load for bench test systems. But, the speed and torque of induction motors are not easy to be controlled accurately. In this work, an electrical dynamometer based on the induction motor is proposed. In order to get better control performance of torque and speed of induction motor, an improved direct torque control method(DTC) is also developed based on the space vector modulation(SVM) technique. The performance of the proposed dynamometer system is validated in the Matlab/Simulink platform. The simulation results show that the new dynamometer has good torque and stator flux response. And the torque and stator current ripples of it are reduced significantly compared with using the conventional DTC method.展开更多
针对因非线性负载引起的电网谐波污染问题,引入有源电力滤波器(Active power filter,APF)进行治理。分析滞环比较法的工作过程并指出不足,引入空间矢量法解决输出电压相间干扰问题。改进APF的控制策略,把滞环比较和空间矢量结合起来实...针对因非线性负载引起的电网谐波污染问题,引入有源电力滤波器(Active power filter,APF)进行治理。分析滞环比较法的工作过程并指出不足,引入空间矢量法解决输出电压相间干扰问题。改进APF的控制策略,把滞环比较和空间矢量结合起来实现电流跟踪控制。最后通过MATLAB/Simulink仿真,比较两种控制策略的仿真结果,证明空间矢量滞环控制具有更好的谐波补偿效果。展开更多
基金Project(SS2012AA04104)supported by High-tech Research and Development Program of China
文摘AC motors, especially the squirrel cage induction motors have the advantages of simple structure, good reliability and low cost. They are more suitable to be used as electrical dynamometers to provide dynamic load for bench test systems. But, the speed and torque of induction motors are not easy to be controlled accurately. In this work, an electrical dynamometer based on the induction motor is proposed. In order to get better control performance of torque and speed of induction motor, an improved direct torque control method(DTC) is also developed based on the space vector modulation(SVM) technique. The performance of the proposed dynamometer system is validated in the Matlab/Simulink platform. The simulation results show that the new dynamometer has good torque and stator flux response. And the torque and stator current ripples of it are reduced significantly compared with using the conventional DTC method.
文摘针对因非线性负载引起的电网谐波污染问题,引入有源电力滤波器(Active power filter,APF)进行治理。分析滞环比较法的工作过程并指出不足,引入空间矢量法解决输出电压相间干扰问题。改进APF的控制策略,把滞环比较和空间矢量结合起来实现电流跟踪控制。最后通过MATLAB/Simulink仿真,比较两种控制策略的仿真结果,证明空间矢量滞环控制具有更好的谐波补偿效果。
