Analysis of space vector modulation technique in inverter-fed fault-tolerant induction motor drive

Modeling and Control of Permanent-Magnet Synchronous Generators Under Open-Switch Converter Faults

“…It is larger for θ = 0 • or θ = 60 • (maximum voltage amplitudeû max (u dc , 0) = 2 3 u dc ) than for θ = 30 • (minimum voltage amplitudê u max (u dc , π/6) = 1 √ 3 u dc ). Invoking trigonometric identities leads to the expression ofû max in (14) by only considering the first sector of the voltage hexagon, i.e. θ = θ ∈ 0 • , 60 • .…”

“…Note that, in the first sector, θ coincides with θ. Then, by using the auxiliary phase angle θ as defined in (14), the generalized formula for the available amplitude ûmax is obtained for all other sectors of the voltage hexagon.…”

“…To ensure a safe and uninterrupted operation of the electrical drive, a fault-tolerant control strategy has to be implemented. In [13], [14], [15], [16], a modified space vector modulation (SVM) is proposed for two-level converters. These contributions adapt the switching patterns and replace those space vectors which cannot be applied due to the open-switch fault.…”

Predictive flux and torque control of induction motor drive under post-fault operation of three-phase voltage inverter

“…Depending on a motor drive system purpose, a faulty transistor can be swap out with a redundant switch so that a total drive functionality is maintained or a faulty inverter leg is isolated from an electric motor and then additional circuits are activated between a motor and an inverter. From an economic point of view, the second approach is more beneficial than the first one but does not sustain a nominal drive performance, namely a linear inverter voltage modulation range is significantly reduced, so a nominal speed of a full-loaded drive cannot be obtained [10]. Nevertheless, in some applications, a remedial action which consider a decrease of a motor drive functionality in favor of economical profits is recommended.…”

“…Unfortunately, an implementation of the low-cost FTCM is usually difficult because of some hardware limitations that cannot be neglected in a control algorithm. In case of the four-switch inverter topology, which is considered in this paper, a main problem constitutes a capacitor voltage unbalance in DC-link of a power converter [5,10].…”