Research On Safe And Stable Operation Of PMSM For Urban Rail Train

In recent years,with the continuous expansion of the urban population in my country,urban roads are in a state of overloaded operation.Urban rail transit can not only effectively reduce the probability of traffic congestion on the road surface,but also reduce the consumption of non-renewable energy,protect the environment,and contribute to the sustainable development of the economy.It is becoming more and more popular.Due to the short distance between stations on the urban rail transit line and the large number of trains traveling,urban rail trains need to be frequently switched under five operating conditions: starting,accelerating,decelerating,constant speed,and braking.As the “heart” of trains,the train traction system directly determines the dynamic performance of the train,and is the executive organ to ensure the safety of trains,which affects the running safety of trains.In order to ensure the safety of the urban rail train operation,it is of great practical significance to study the highperformance control algorithm of the permanent magnet synchronous motor.significance.Therefore,domestic and foreign companies and university research institutes have invested in the research of urban rail train traction drive control system.This paper takes the built-in permanent magnet synchronous motor as the research object,and the research and analysis are as follows.In this paper,the current research status of urban rail permanent magnet synchronous motor at home and abroad is introduced firstly,and the mathematical model of interior permanent magnet synchronous motor(IPMSM)is derived based on the analysis of coordinate transformation theory,with emphasis on the traditional direct torque control algorithm and the direct torque control algorithm based on space voltage vector modulation technology(SVPWM).Then,two improvement strategies are proposed in the permanent magnet synchronous motor direct torque control system.One is to suppress the electromagnetic torque ripple of the urban rail permanent magnet synchronous motor speed control system,and the double quasi proportional resonant(QPR)controllers of flux and torque is designed;the second is to improve the antidisturbance of the permanent magnet synchronous motor control system of urban rail trains and further suppress the overshoot chattering of the system.In the speed loop of the urban rail permanent magnet synchronous motor speed control system,an improved high-level is proposed.The sliding mode controller replaces the PI controller link in the existing system,and a simulation model is built for performance comparison.Finally,in order to verify the correctness and feasibility of the two proposed algorithms,the hardware control loop and software part of the built-in permanent magnet synchronous motor direct torque control system are designed,and the safe and stable operation of the permanent magnet synchronous motor is realized on the hardware experimental platform.