Research Of Induction Motor Energy Saving Control System Based On Extension Control Strategy

Asynchronous motors play a very important role in the fields of industry,agriculture and national defense.They convert electrical energy into mechanical energy and are widely used power machines.When running at rated condition,the energy conversion efficiency of the asynchronous motor is high,but when it is operated under deviating from the rated operating condition,especially under light load and low speed,its efficiency is obviously reduced,which will cause great economic losses.Adopting appropriate control schemes to reduce the losses of asynchronous motors and improve their operating efficiency have important practical significance for energy conservation,environmental protection and sustainable development.This paper designs an energy-saving control system for asynchronous motors that combines extension control strategy and vector control.By studying the dynamic model of the asynchronous motor in the two-phase stationary coordinate system,the mathematical expression that facilitates the MATLAB/SIMULINK modeling is deduced.In the MATLAB/SIMULINK environment,an asynchronous motor model considering the iron loss is established.Compared with MATLAB own motor model,the iron loss model has a similar response curve,and due to taking into account the iron resistance,it can more truly reflect the actual working conditions of the motor,laying the foundation for further study of the asynchronous motor energy-saving control strategy.In the aspect of extension control strategy,by analyzing the basic principle,composition structure and design flow of the extension controller,a extension controller adapted to a complex system is designed.Compared with the traditional PID controller in the linear system,nonlinear system and large delay system,the simulation results show that the extension controller has a shorter overshoot time and rise time,with the parameters of self-tuning and adaptive The advantages are suitable for handling various complicated working conditions of the motor and provide the algorithm basis for the establishment of energy-saving control systems.In the synchronous rotating coordinate system,by analyzing the equivalent circuit of the asynchronous motor,the functional expression of the optimal flux linkage is deduced.Two motor parameters that affect the optimal flux linkage are calculated: speed and torque.Considering the influence of the change of motor parameters on the optimal flux linkage,a method of optimizing the optimal flux surface by using the extension control strategy to counteract the influence of the parameter change is formed.By comparing the motor losses under different flux conditions,the energy-saving situation of the asynchronous motor is analyzed.The result shows that the extension controller is more superior than the traditional controller in the application of the motor energy-saving system.In summary,based on the basic extension controller and vector control,this paper proposes the extension control strategy and builds the extension controller model.Through the comparison and analysis of the simulation results,the superiority of this control strategy is proved,which can effectively achieve the energy saving and consumption reduction of the asynchronous motor control system.