Abstract
In this paper, the decoupling matrix in a five-phase permanent magnet synchronous motor (FPMSM) is rebuilt and changed, according to different open-phase conditions, which complicate the switch and control algorithm. This paper proposes a unified fault-tolerant control strategy with decoupling transformation matrix, effectively suppressing the torque ripple for several open-phase faults. The current algorithms for different open-phase faults are demonstrated; torque ripple, especially, is analyzed with third harmonic magnetomotive force (MMF). The unified current control law is expressed with two adjustable coefficients, which are regulated for torque ripple compensation. As the current control equation remains unchanged, the fault-tolerant can smoothly switch from normal to fault condition, only with different coefficients. The proposed method with torque compensation (TC) can realize effective suppression of torque ripple. The decoupling relationship between open-phase control laws and fault-tolerant current is verified by simulation. The torque ripple of fault-tolerant and effect of torque compensation (TC) under all fault-tolerant conditions are simulated by finite element simulation. The stability of switching and correctness of torque compensation are verified by experiments.
Highlights
The development of adjacent two-phase (AC) drive systems has led to an increase in application of high-power equipment
Keeping these applications in mind, several recent works have focused on the development of high-performance, fault-tolerant control schemes for induction machines (IMs) and permanent magnet synchronous machines (PMSMs) [4,5,6,7]
Under one-phase open fault, the strategy realizes two kinds of fault operation modes using the principle of single-phase maximum torque output (MTO) and minimum copper loss (MCL) of stator by only changing the harmonic spatial reference current
Summary
The development of AC drive systems has led to an increase in application of high-power equipment. In [16], the fault-tolerant control of normal decoupling transformation is applied in a fault-tolerant state, and theoretical analysis proves that this strategy can guarantee that the magnetomotive force remains unchanged before and after fault tolerance, and it is verified on a seven-phase induction motor. It is easier to switch between each fault-tolerant and normal operation This strategy is applicable to various open-phase faults, and the method of unified torque compensation (TC) can effectively suppress torque ripple under all open-phase fault-tolerant conditions. Under one-phase open fault, the strategy realizes two kinds of fault operation modes using the principle of single-phase maximum torque output (MTO) and minimum copper loss (MCL) of stator by only changing the harmonic spatial reference current. By analyzing the torque ripple of the unified fault-tolerant control strategy in the normal decoupling space, a unified torque compensation method is proposed to suppress the torque ripple in all open-phase conditions. The correctness of the proposed torque compensation (TC) method is verified in an AC open-fault experiment
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
