95 research outputs found
A General Mathematical Model for non-Redundant Fault-Tolerant Inverters
No full textIndustrial systems able to release trusted services is an integrated concept that resumes the attributes of availability, reliability, safety, integrity, and maintainability. In power
electronics this can be aimed via the introduction of fault
tolerant architectures. While In the past technical literature the
mathematical modeling problem for non-redundant converters
was fronted studying separately the cases of fault leg by leg, in
this paper a general model able to include the three possible
cases of leg faults with a unique set of equation is introduced
and discussed. The same model allows to evaluate the DC Link
transient and steady state evolution and also allows to develop with much ease an all at once control strategy for the three fault
cases
E l’Europa disumanizzò se stessa. Geografie mediterranee in azione.
No full textRecensione del Workshop internazionale "E l’Europa disumanizzò se stessa. Geografie mediterranee in azione." tenutosi a Palermo il 10 e 11 novembre 2015
Power Quality Savings with Controlled Fault-Tolerant Power Converters
No full textPower quality is simply the interaction of electrical power with electrical equipments. If electrical equipments operate correctly and reliably without being damaged or stressed, a suitable level of power quality is assured.
On the other hand, if the electrical equipment malfunctions, is unreliable, or
is damaged during normal usage, power quality is poor and probably the economical loss could be preeminent over the technical one. In the scenario of the Distributed generation power quality issues will be more-
over important because an higher dissemination of power conditioning equip-
ment will be requested and this obviously will increase the sources of vulnera-
bility for the electrical systems.
In the present paper fault tolerant power converters are considered as a viable
solutions of power quality problem solution and a suitable control algorithm is
also presented. The control hereafter presented is based on the model of the
power converter reformulated in terms of healthy leg binary variable, and the
paper shows as this control is able to save the aspect of power quality when
the converter works in the linear range. The effectiveness of such an algorithm
and of the fault tolerant power converters are finally verified through computer
simulations
"L'Italia altrove. Una lettura postcoloniale delle riviste geografiche italiane (1882-1942)"
No full textA Geometrical Simple Approach for Power Silicon Devices Fault Detection and Fault-Tolerant Operation of a Voltage Source Inverter
No full textFault-tolerant converters have been widely investigated for years and nowadays an extensive technical literature on this field exists. This paper presents a novel fault detection algorithm based on a simple geometrical approach. In the algorithm analysis both the case of faults in single device and the lose of an entire inverter leg have been considered. False positive detections are avoided by considering a proper number of current samples. The proposed fault detection algorithm is characterized by simplicity, low computational and implementation effort with a consequent enough fast execution, easy control integration with the possibility to use it both in hardware in the loop systems and Microprocessor of common industrial usage. The proposed algorithm is verified both with simulation tools and experimental results and reveals a valid and suitable alternative to the actual state of the art in the field of inverter fault detection
A platform-independent software for the design and analysis of windings of rotating electrical machines
No full textIn this paper the Authors present a highly modular and platform-independent software, being based on the MATLAB® programming environment, which is proposed as a valuable aid in the design and analysis of the windings of rotating electrical machines. Unlike the major part of the commercial software, the cases of both symmetric and asymmetric (unbalanced) windings with any number of phases are here considered. The software can perform a considerable amount of calculations in order to determine automatically the optimal structure of the winding starting from its specifications. It is also able to draw the winding map and gives the results of calculation for the harmonic winding factors. The realized software allow the designer to reduce the harmonics winding coefficient with the only drawback of a small reduction of the fundamental coefficient, both for e.m.f. and m.m.f
Implementation and experimental validation of a real-time PWM algorithm based on B-Spline carriers for three phase voltage source inverters
No full textThis paper presents the implementation and experimental results of an algebraic real-time sinusoidal pulse width modulation algorithm (SPWM) based on B-Spline carriers. B-spline functions are used as carrier signals with the aim to to reduce harmonic content of the three phase inverter output voltage. The presented algorithm eliminates the problem of B-spline recursive evaluation with convolution integrals or convolution sums in digital counterpart. The pulse pattern synthesis is made with the help pre-calculated duty cycle expressions. In this way there is no real need to synthesize the carrier signal so the hardware and the whole inverter control system becomes cheaper, more reliable and affordable. The proposed implementation Algorithm effectiveness is finally verified by means of experimental tests in different operating condition (e.g. for different values of the amplitude modulation index and for different values of the power factor) of a three phase inverter
Flexible power converters for the fault tolerant operation of Micro-Grids
No full textThe progressive penetration level of Distributed Generation (DG) is destined to cause deep changes in the existing distribution networks no longer considered as passive terminations of the whole electrical system. A possible solution is the realization of small networks, namely the Micro-Grids, reproducing in themselves the structure of the main production and distribution of the electrical energy system. In order to gain an adequate reliability level of the microgrids the individuation and the management of the faults with the goal of maintaining the micro-grid operation (fault tolerant operation) is quite important. In the present paper flexible power converters and a companion control algorithm for the fault tolerant operation of microgrids are presented. The effectiveness of such an algorithm and of the fault tolerant power converters are verified through computer simulations
A novel improved matlab-based software for the electric and magnetic analysis and design of rotating electrical machines
No full textThe aim of this paper is to present a software for the analysis and design of windings of rotating electrical machines, considering both the electric and the magnetic specifications on the machine. The considered machines are induction motors (IM) and PM synchronous motors (PMSM). The software accounts for the case of buried magnets (IPMSM), but with some limits, because the calculations require a much more detailed analysis regarding the magnetic circuit. However, this initial limitation of the software, that will be removed in a later version, does not constitute a major limitation as confirmed by the examples presented in this paper
Algebraic Real-Time Algorithm for B-Spline Sinusoidal Pulse Width Modulation in Three Phase Voltage Source Inverters
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