Analysis of VFD Induction Motor Current Disturbances by Prony Analysis and Motor Redesign by Intelligent Optimization Techniques

摘要

An analytical approach is discussed in this paper to minimize the influence of disruptive current spikes occurring at low frequency in a Variable Frequency Drive (VFD) induction motor. In a continuous process industry a 3-phase, 550 kW, induction motor coupled with a reciprocating pump, is tested at low frequency. Prony method is used to analyze the data. The optimal values of motor design parameters that deliver sufficient mechanical power at low frequency and cause the least disruptive current spikes is arrived at, by using intelligent optimization techniques like Artificial Bee Colony (ABC), Particle Swarm Optimization (PSO), and Genetic Algorithm (GA). Using the optimal design values obtained, Taguchi method is applied on the VFD control parameters. The optimal control parameters thus obtained for tuning the VFD to get the minimal current spikes is comparable with the practical VFD parameters which is seen to be able to deliver stable operation of the motor at low frequency. The optimal motor design parameters can be used to procure a new motor that can give stable operation at low frequency.