The Research Of Synchronous Control For Multi PMSM Drive System

With the rapid development of industrial technology, the theory of multi-motors synchronization control has been widely applied to various industrial fields, such as paper machines, printing presses, textile machines, numerical control machines with multi-degrees of freedom and so on. Even the higher power applications like the high speed railway traction system need it as the key techonlology. The performance of synchronization control has a strong influence over the quality of production and the security of consumers. And it makes strict requirement of synchronization performance to system because of the different technical parameters of motors. At the same time, with the superiorities of high efferciency, high torque-current ratio, high energy density, and excellent stability, PMSM (permanent magnet synchronous motor) has been the leading edge of motor development. So it is important to do the research of multi-PMSM high precision synchronization control system.At first, the paper compares the performance and characteristic between Vector Control Strategy and Direct Torque Control Strategy, and concludes the different ranges of application. Then, it analyses the Master Control, Master-Slave Control, Cross Coupling Control, and Electronic Virtual Line-Shafting (EVLS) Control these four synchronization methods. Based on the Matlab/Simulink, it concludes their merits and demerits. The paper has the conclusion that multi-PMSM EVLS Vector Control Strategy is the preferred alternative to the high speed railway system.For the purpose of further optimization, this paper applies the fuzzy PID controller to the Vector Control system, and realizes the self-tunning of parameters. Based on the analysis of CRH2railway system, four PMSMs EVLS synchronization traction system with the optimization of fuzzy PID theory was presented.