Evaluation method and modelling of electromagnethic processes in the power stage of closed loop DC drive system in condition of periodic speed reverse with current limitation

摘要

Paper deals with investigation of electromagnetic processes in the power stage of DC drive closed loop system. Operation mode of periodical speed reverse with entry in the current limitation area is considered as one of typical and the hardest because of electrical loads, which are maximal. Different area are distinguished in DC drive moments and speeds diagram which separates the DC drive operation mode with recuperation and without recuperation. Equations are obtained which allows to evaluate amount of recuperated energy and overvoltage on the power stage capacitor. It is shown that the most sufficient loads on the power filter capacitor are observed during the recuperation in case of zero load torque. It is also shown that obtained evaluation equations allows to define requirements and to reduce size and mass of power filter and overall power stage during the developing of closed loop DC drive system. Reliability of provided evaluation method is proved by simulation in MATLAB/Simulink. DC drive closed loop system with power stage and consideration of reversible and non-reversible power sources models are presented. Simulations for considered cases are made. It is noted that the small difference between simulation results and evaluations is mostly related with transient electromagnetic processes in armature circuit of DC drive which are neglected.