Open-Phase Fault-Tolerant Direct Torque Control Technique for Five-Phase Induction Motor Drives

Abstract

an alternative to traditional field-oriented control (FOC) methods for three-phase drives. The conventional DTC scheme has been successfully extended to multiphase drives in recent times, using hysteresis regulators to independently track the desired torque and flux in symmetrical five-phase induction machines (IM). The fault-tolerant capability of multiphase drives is an interesting intrinsic advantage for safety-critical applications, where recent research has demonstrated the effectiveness of FOC schemes to perform ripple-free post-fault operation. In spite of the utility of DTC methods in normal operation of the multiphase machine, no extension to manage the post-fault operation of the drive is found in the literature. In this paper, a novel fault-tolerant DTC scheme is presented. The performance of the proposed method is experimentally validated in a five-phase IM drive considering an open-phase fault condition. Provided tests analyze steady and transient states, including the transition from pre-to post-fault operation. Obtained results prove the interest of the proposal, which ensures the open-phase fault-tolerant capability of DTC controlled five-phase IM drives. Index Terms-Direct torque control (DTC), fault-tolerant capability, multiphase induction motor (IM) drives, open-phase fault operation.

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

“…The model predictive control MPC of [24] is employed in this work to regulate the multiphase drive (Fig. 2).…”

“…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.…”

“…From the point of view of post-fault control, the openphase fault has been the most studied fault situation regardless of the control approach [22][23][24][25]. However, there is not a detection method of this fault type that complies with the aforementioned conditions.…”

The use of interpolation techniques in induction motor control

“…Hız denetim performansının arttırılması için tork, akı vb. gibi denetimlerin önerildiği çalışmalar bulunmaktadır [15]- [17]. Yine klasik denetim yöntemlerine ek olarak Kalman Filter [18], alan yönlendirme [19], [20], pozisyon [21], adaptif [22], sonlu elemanlar [23], sonlu farklar [24], lojik [25], gibi yöntemler bulunmaktadır.…”

Three Vectors Model Predictive Torque Control Without Weighting Factor Based on Electromagnetic Torque Feedback Compensation

“…Field-oriented control (FOC) [1] and direct torque control (DTC) [2] has been successfully and widely used because of its robustness and fast response, which qualifies the requirements of high The cost function is to sort the voltage vectors according to the errors of torque and flux in a cycle, as well as to select the optimal voltage vectors, so that the correct operation does not need weight coefficients. Finally, three voltage vectors are applied in each control period, including two active voltage vectors and one zero-voltage vector.…”