Open-end nine-phase machine conversion systems

Melo, Victor F. M. B.; Jacobina, Cursino B.; Freitas, Nayara B. de

doi:10.1109/ecce.2015.7310631

Cited by 4 publications

(6 citation statements)

References 22 publications

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“…since v so = v so′ = 0 because two isolated neutrals are used. It means that, in order to digitally simulate the system under an open-circuit fault in machine phase 1, voltage across its terminals (v s1 ) must be imposed as calculated in (14). In this way, phase 1 current (i s1 ) is forced to be zero.…”

Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

“…(see (18)) So, by replacing (17) and (18) in (14), current i s1 is made zero in digital simulation. If the open-circuit fault occurs in other phase than phase 1, the same proceedings may be used to obtain the expression that must be imposed in simulation to make the current in such phase to be zero.…”

Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

“…The voltage across phase 1 (v s1 ) remains as expressed in (14). In the case in which two phases of one group and one phase of the other group are affected simultaneously by an open-circuit fault, it is not possible to keep sinusoidal flux operation and the system must be shut down.…”

Section: Three-phase Open-circuit Faultmentioning

confidence: 99%

“…Note that voltage across the faulty phase (v s1 ) is required to calculate the new reference voltages. For digital simulation using programming language C, (14) is used. For experimental implementation, a sensor measures this voltage and the measured signal is sent to a digital signal processor (DSP), where the new reference voltages are generated and processed to provide the switches gating signals.…”

Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

“…[6]. In this context, a cascaded multilevel structure named dual inverter is extensively discussed for multiphase drives for five- [7][8][9], six- [10,11], seven- [12], and nine-phase [13,14] drives. Fig.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fault tolerance performance of dual‐inverter‐based six‐phase drive system under single‐, two‐, and three‐phase open‐circuit fault operation

Melo

Jacobina

Rocha

2018

IET Power Electronics

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Considering that so far all studies regarding multiphase drives fault tolerance performance have been carried out making use of conventional two-level inverters, this study discusses the fault tolerance performance of a six-phase drive system based on a dual inverter under single-, two-, or three-phase open-circuit fault. Aiming applications where simplicity and low computation efforts are required and fast dynamic response is not imperative, an open-loop volts/hertz (V/f) compensation strategy is discussed in order to keep the rated operation even after the occurrence of the fault, assuring the maintenance of sinusoidal flux. The six-phase machine mathematical model after the fault is detailed and utilised to elaborate the compensation strategy. Simulation and experimental results show the validity of the discussed solution and its feasibility.

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Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

Section: Three-phase Open-circuit Faultmentioning

confidence: 99%

Section: Single-phase Open-circuit Faultmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fault tolerance performance of dual‐inverter‐based six‐phase drive system under single‐, two‐, and three‐phase open‐circuit fault operation

Melo

Jacobina

Rocha

2018

IET Power Electronics

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Dc‐link voltage stability analysis technique for hybrid five‐phase open‐end winding drives

Darijevic¹,

Jones

Levi

2019

IET Electric Power Applications

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This paper studies the dc-link voltage stability for a hybrid five-phase open-end winding (OeW) drive operating under carrier based (CB) pulse-width modulation (PWM). The drive consists of a five-phase induction machine, supplied using one three-level and one two-level voltage source inverter (VSI). This configuration is analysed for the case of isolated dc-link rails, while dc-link voltage ratio is considered as an additional degree of freedom. It is demonstrated that different dc-link voltage ratios lead to the different overall number of voltage levels across stator windings. Modulation strategies are investigated and their performances are analysed from the dc-link voltages stability point of view. An analytical method for dc-link voltage stability analysis is presented. Results show that the four-level configuration always leads to stable dc-link voltages, regardless of the modulation strategy. On the other hand, if six-level configuration is combined with modulation strategies that lead to an optimal harmonic performance, not all dc-link capacitor voltages will be in balance depending on the operating conditions.

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