Critical Failure Mechanisms in Isolated Three-phase Multilevel Inverters Design

10.36227/techrxiv.14794842.v1 ◽

2021 ◽

Author(s):

Juan Carlos Iglesias-Rojas

Keyword(s):

Fault Tolerant ◽

Short Circuit ◽

Failure Mechanisms ◽

Low Frequency ◽

Industrial Applications ◽

Control Signal ◽

Design Stage ◽

Inrush Current ◽

Inductive Load ◽

Multilevel Inverters

<div>Isolated multilevel inverters are widely used in renewable energy systems and industrial applications. Isolated IGBT topologies exploit the usage of low-frequency transformers that improve robustness and reliability. However, critical failure mechanisms should be considered at the design stage to ensure proper performance. This paper describes these critical failure mechanisms, such as short circuit, cross-conduction, IGBT high inductive load avalanche, IGBT second turn-on, VS-undershoot, transformer inrush current, IGBT thermal runaway, and cable switching interference. Furthermore, this paper comprises design techniques to prevent these failures. The previous failure mechanisms come from the inverter's power stage, except switching interference from control signal cables and directly affecting the control device functionality. This work also proposes a circuit topology based on FPGA resources to reduce switching interference from control signal cables. It behaves like a fault tolerant digital input that effectively filters bouncing events shorter than 2μs. Measurements report satisfactory experimental results upon constructing a 45kVA ac-side-isolated 13-level inverter.</div>

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A Novel Methodology for Adaptive Coordination of Multiple Controllers in Electrical Grids

Mathematics ◽

10.3390/math9131474 ◽

2021 ◽

Vol 9 (13) ◽

pp. 1474

Author(s):

Ruben Tapia-Olvera ◽

Francisco Beltran-Carbajal ◽

Antonio Valderrabano-Gonzalez ◽

Omar Aguilar-Mejia

Keyword(s):

Power Systems ◽

Power System ◽

Electric Power ◽

Large Scale ◽

Short Circuit ◽

Dynamic Performance ◽

Low Frequency ◽

Electric Power System ◽

Design Stage ◽

Positive Interaction

This proposal is aimed to overcome the problem that arises when diverse regulation devices and controlling strategies are involved in electric power systems regulation design. When new devices are included in electric power system after the topology and regulation goals were defined, a new design stage is generally needed to obtain the desired outputs. Moreover, if the initial design is based on a linearized model around an equilibrium point, the new conditions might degrade the whole performance of the system. Our proposal demonstrates that the power system performance can be guaranteed with one design stage when an adequate adaptive scheme is updating some critic controllers’ gains. For large-scale power systems, this feature is illustrated with the use of time domain simulations, showing the dynamic behavior of the significant variables. The transient response is enhanced in terms of maximum overshoot and settling time. This is demonstrated using the deviation between the behavior of some important variables with StatCom, but without or with PSS. A B-Spline neural networks algorithm is used to define the best controllers’ gains to efficiently attenuate low frequency oscillations when a short circuit event is presented. This strategy avoids the parameters and power system model dependency; only a dataset of typical variable measurements is required to achieve the expected behavior. The inclusion of PSS and StatCom with positive interaction, enhances the dynamic performance of the system while illustrating the ability of the strategy in adding different controllers in only one design stage.

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Analysis of Fault-Tolerant Operation Capabilities of an Isolated Bidirectional Current-Source DC–DC Converter

Energies ◽

10.3390/en12163203 ◽

2019 ◽

Vol 12 (16) ◽

pp. 3203

Author(s):

Andrei Blinov ◽

Roman Kosenko ◽

Andrii Chub ◽

Volodymyr Ivakhno

Keyword(s):

Failure Modes ◽

Fault Tolerant ◽

Short Circuit ◽

Current Source ◽

Industrial Applications ◽

Operating Range ◽

And Performance ◽

Multi Mode ◽

Short Circuit Condition

Reliable and predictable operation of power electronics is of increasing importance due to continuously growing penetration of such systems in industrial applications. This article focuses on the fault-tolerant operation of the bidirectional secondary-modulated current-source DC–DC converter. The study analyzes possible topology reconfigurations in case an open- or short-circuit condition occurs in one of the semiconductor devices. In addition, multi-mode operation based on topology-morphing is evaluated to extend the operating range of the case study topology. The influence of post-failure modes on the functionality and performance is analyzed with a 300 W converter prototype. It is demonstrated that failure of one transistor in the current-source side can be mitigated without dramatic loss in the efficiency at maximum power, while preserving bidirectional operation capability.

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Review on Single-DC-Source Multilevel Inverters: Topologies, Challenges, Industrial Applications, and Recommendations

IEEE Open Journal of the Industrial Electronics Society ◽

10.1109/ojies.2021.3054666 ◽

2021 ◽

Vol 2 ◽

pp. 112-127

Author(s):

Mohamed Trabelsi ◽

Hani Vahedi ◽

Haitham Abu-Rub

Keyword(s):

Industrial Applications ◽

Multilevel Inverters

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Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Energies ◽

10.3390/en14113266 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3266

Author(s):

Antonio Roniel Marques de Sousa ◽

Marcus Vinicius Alves Nunes ◽

Wellington da Silva Fonseca ◽

Ramon Cristian Fernandes Araujo ◽

Diorge de Souza Lima

Keyword(s):

Structural Analysis ◽

Electric Power ◽

Short Circuit ◽

Real Data ◽

Short Circuit Current ◽

Power Transformers ◽

Inrush Current ◽

Electric Power Supply ◽

Axial Forces ◽

Radial Forces

The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also compromising its operation and, consequently, the electric power supply. Thus, in this paper, electromagnetic, thermal, and structural analysis of power transformers was carried out with the objective of providing the operator with information on the ideal moment for performing predictive maintenance, avoiding unplanned shutdowns. For this, computational simulations were performed using the finite element method (FEM) and, from that, the different transformer operation ways, nominal currents, inrush current, and short-circuit current were analyzed. In this perspective, analyses of the effects that thermal expansion, axial forces, and radial forces exerted were carried out, contributing to possible defects in this type of equipment. As a study object, simulations were carried out on a 50 MVA single-phase transformer. It is important to emphasize that the simulations were validated with real data of measurements and with results presented in the current literature.

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Superior Short Circuit Performance of 1.2kV SiC JBSFETs Compared to 1.2kV SiC MOSFETs

Materials Science Forum ◽

10.4028/www.scientific.net/msf.963.797 ◽

2019 ◽

Vol 963 ◽

pp. 797-800 ◽

Cited By ~ 4

Author(s):

Ajit Kanale ◽

Ki Jeong Han ◽

B. Jayant Baliga ◽

Subhashish Bhattacharya

Keyword(s):

High Temperature ◽

Short Circuit ◽

Switching Loss ◽

Switching Circuit ◽

Inductive Load ◽

Circuit Performance ◽

Switching Performance ◽

Turn On ◽

Switching Losses ◽

High Side

The high-temperature switching performance of a 1.2kV SiC JBSFET is compared with a 1.2kV SiC MOSFET using a clamped inductive load switching circuit representing typical H-bridge inverters. The switching losses of the SiC MOSFET are also evaluated with a SiC JBS Diode connected antiparallel to it. Measurements are made with different high-side and low-side device options across a range of case temperatures. The JBSFET is observed to display a reduction in peak turn-on current – up to 18.9% at 150°C and a significantly lesser turn-on switching loss – up to 46.6% at 150°C, compared to the SiC MOSFET.

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Modeling and Fault Diagnosis of Interturn Short Circuit for Five-Phase Permanent Magnet Synchronous Motor

Journal of Electrical and Computer Engineering ◽

10.1155/2015/168786 ◽

2015 ◽

Vol 2015 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Jian-wei Yang ◽

Man-feng Dou ◽

Zhi-yong Dai

Keyword(s):

Parameter Estimation ◽

Fault Diagnosis ◽

Permanent Magnet ◽

Fault Tolerant ◽

Short Circuit ◽

Estimation Method ◽

Trust Region ◽

Fault Tolerant Control ◽

Trust Region Algorithm ◽

Parameter Estimation Method

Taking advantage of the high reliability, multiphase permanent magnet synchronous motors (PMSMs), such as five-phase PMSM and six-phase PMSM, are widely used in fault-tolerant control applications. And one of the important fault-tolerant control problems is fault diagnosis. In most existing literatures, the fault diagnosis problem focuses on the three-phase PMSM. In this paper, compared to the most existing fault diagnosis approaches, a fault diagnosis method for Interturn short circuit (ITSC) fault of five-phase PMSM based on the trust region algorithm is presented. This paper has two contributions. (1) Analyzing the physical parameters of the motor, such as resistances and inductances, a novel mathematic model for ITSC fault of five-phase PMSM is established. (2) Introducing an object function related to the Interturn short circuit ratio, the fault parameters identification problem is reformulated as the extreme seeking problem. A trust region algorithm based parameter estimation method is proposed for tracking the actual Interturn short circuit ratio. The simulation and experimental results have validated the effectiveness of the proposed parameter estimation method.

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