An Analytical Approach to Synthesis and Modeling of Torque Control Strategy for Two-Mass Resonant Systems

Torsional oscillations due to rotor dynamic are very important in power system dynamic analysis. The major problem in torsional oscillation in flexible system is the result of connecting a load to motor with long axis. A simple model of this sample mechanical resonant system is a two-mass system such as industrial motor drives. In this paper PID, PID_P and modify PID controllers is applied in order to control torque of a two-mass system. The pole-placement controller such as coefficient diagram method (CDM) and integral of time multiplied by absolute error (ITAE) is used to assign closed-loop poles of the system characteristic equation. A complete state-space mathematical model for two-mass resonant system is first developed and behavior dynamic appointment roots locus of characteristic equation is analyzed. The dynamic analysis is verified by transfer function simulation using Matlab and time domain simulation of the two-mass system. Finally, advantages of the proposed design method are demonstrated in the cases of torque control and corresponding results are compared.