Comparative Study of Predictive and Resonant Controllers in Fault-Tolerant Five-Phase Induction Motor Drives

Abstract

Abstract One of the most attractive features of multiphase machines is the fault-tolerant capability due to the higher number of phases. Different post-fault control strategies based on hysteresis, PI-resonant and predictive techniques have been recently proposed. They all proved their capabilities to withstand fault situations and to preserve the fundamental component of the air-gap field, while achieving minimum losses, maximum torque per-ampere and reducing torque vibrations. Nonetheless, due to their recent introduction, no thorough study has yet appeared comparing the performance of these controllers. In this paper two open-phase fault-tolerant control schemes are experimentally compared in a real five-phase induction machine. The controllers being compared are based on PI-resonant and predictive control techniques, respectively. The experiments include pre-and postfault situations. Obtained results show that both control methods offer nearly the same performance. When compared, predictive control provides faster control response and superior performance at low speed operation but is found to be less resilient to fault detection delays and to have higher current ripple. Regarding the controller implementation, it is shown that the transition from preto post-fault operation involves modelling the non-linear effects observed when an open-phase fault occurs for the predictive controller, and the proper retuning of the PI trackers for the PIresonant controller, in order to ensure post-fault operation.

Finite control set and modulated model predictive flux and current control for induction motor drives

“…Fig. 2 shows the sequence in which (9), (10) and (11) The cost function (g c ) to be minimized to achieve predictive control is given in terms of reference and actual/predicted magnitudes of the state variables (λ and i sq ) given in (12).…”

“…Although this control type's use has majorly focused on converter control, the trend of its application for variable speed drives control is also on the rise [8][9][10][11][12][13][14][15][16][17][18].…”

“…In the area of motor drives, MPC has been very successfully employed for predictive torque control (PTC) [9,10,13,14] and predictive current control (PCC) [13], and predictive flux control (PFC) [11] and speed control [15] of induction motor drives. The research extended the use of MPC to sensorless [14,16,17] as well as fault tolerant [12] induction motor drives. The MPC's application range is not limited to threephase applications but has also encompassed multiphase induction machine topologies [12].…”

“…The research extended the use of MPC to sensorless [14,16,17] as well as fault tolerant [12] induction motor drives. The MPC's application range is not limited to threephase applications but has also encompassed multiphase induction machine topologies [12].…”

An Open-phase Fault Detection Method for Six-phase Induction Motor Drives

“…The fault management in a drive can be classified in three stages: fault detection FD [13][14][15][16][17], fault isolation FI [18][19] and implementation of a fault tolerant control (FTC) [20][21][22][23][24][25]. The implementation of these three stages in the system is necessary to ensure a suitable operation and to protect the system in post-fault situation.…”