A comparison of original and optimized vector control systems using computer simulation

This article describes the optimization of the frequency converter control structure in modern electric drives and a comparative analysis of the original and optimized vector control system using computer simulation. The method of optimization is the maintenance of the angle between the stator current and the rotor co-current at a value which will correspond to the numerical proximity of the values of the torque-forming and magnetizing components of the stator current. The characteristics of the induction motor, the structure of the IF-AD model simulating the operation of a hoisting device, plots of the torque, current, speed, active and reactive energy consumption, and tg φ′ are given. The frequency converter used in the modelling is reversible, that is, it allows two-way energy exchange with the network. This provides an opportunity to study the system at the moment of energy recovery, which is an area not covered in the literature, and emphasizes the importance of the study. The effectiveness of the optimization of the vector control system is investigated, in particular for the energy consumption of the electric motor. The results show that the optimized vector control system provides higher energy efficiency than the original system. Numerical data are provided.