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Long distance European trains are usually powered by a single-phase AC line of 25 kV at 50 Hz. Traditionally a traction drive mainly consists of a single-phase AC/DC converter, a DC-link bus and a three-phase DC/AC PWM converter. In the past, the DC-link bus was obtained through diode rectifiers, which generate line currents with high harmonic distortion and low power factor. In order to reduce these...
Among the multilevel converter topologies the cascaded H-bridge converter (MCHBC) differs from other topologies by having series connections of several power cells, producing a better voltage quality and higher voltage output range, and using the same voltage power supply levels. This characteristic adds several benefits as it allows a modular system, the use of low voltage power supplies, and output...
The use of wind energy in urban contexts, for a number of small power applications, is of greater and greater interest. The urban environment is characterised by multidirectional winds with a wide speed range, therefore it is necessary that the generation system is capable of delivering power in a wide range of operating conditions. For this reason it is of great interest to determine which power...
In order to compensate the worldwide energy consumption that is still rising, the wind energy is becoming more and more important. For this reason, the analysis of wind energy conversion systems, in which the occurrence of faults has a high negative impact, becomes a very important issue. Considering this, the aim of this paper is to present some diagnostic methods for open-circuit faults in the two...
Practically all the diagnostic methods for open-circuit faults in voltage source inverters (VSI) developed during the last decades, are focused on the occurrence of single faults and do not have the capability to handle and identify multiple failures. This paper presents a new method for real-time diagnostics of multiple open-circuit faults in voltage source inverters feeding ac machines. In contrast...
This paper presents an analysis of two different control strategies applied to a bidirectional dc-dc boost converter in a permanent magnet synchronous motor drive for hybrid electric vehicles. A constant rated voltage-fed inverter and a variable voltage control strategy that takes into account the motor mechanical speed to adjust the dc-dc converter output voltage are considered. Moreover, single...
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