PASSALACQUA M.

A double-input bidirectional DC-DC converter, with an innovative architecture, exploiting the use of only three switches, is taken into account in this paper. The modulation strategy proposed in the technical literature for controlling such a converter leads to a very low efficiency at low-load, because the converter is only able to operate in...

The modulation strategy, proposed in the technical literature to control the three-switch double-input bidirectional DC-DC converter, forces the converter itself to work in Continuous Conduction Mode at low-load and therefore efficiency drops significantly. In this paper, a novel modulation strategy, exploiting Discontinuous Conduction Mode at...

A double-input DC-DC converter is taken into account in this paper. The converter is bidirectional and both currents can be controlled independently. On the one hand it allows to reduce the number of switches, on the other hand, it exhibits a higher efficiency in comparison to a traditional solution with two half-bridge converters in parallel...

In this paper, an accurate efficiency evaluation of an innovative three-switch double input DC-DC converter for hybrid vehicle applications was carried out. The converter was used to interface two storages, (e.g., supercapacitor and battery) to the DC link. A refined model was created in MATLAB/Simulink Plecs environment and it was used to...

Sensorless algorithms for Permanent Magnet Synchronous Motor (PMSM) are generally divided in methods for the low speed region and methods for the medium-high speed region. Algorithms based on high frequency injection show a good behavior for low motor speed, nevertheless voltage injection is associated to loud acoustic noise and additional...

Permanent magnet synchronous motor sensorless algorithms for low speed region are usually based on rotor anisotropy. Although many studies showed a good behavior of this type of control, high frequency voltage injection is required, which causes loud acoustic noise in addition to electrical losses. On the other hand, methods based on back...

A self-commissioning sensorless algorithm for surface mounted permanent magnet synchronous motors is shown in this paper. The sensorless method is based on rotor flux observer and, differently from methods based on motor anisotropy, it does not require high frequency voltage injection; therefore, it does not cause additional losses and acoustic...

Nowadays HVDC based on Voltage Source Converters (VSC) are based on the Modular Multilevel Converter (MMC) and the applications in which the Full Bridge (FB) Cells are used are increasing. Therefore, this paper presents an analytical study of the MMC interaction between the converter currents and voltages. The study is applied to the case of...

Nowadays, the Modular Multilevel Converter represents an important solution for grid applications, as it can easily extend the output voltage range, as required for instance in high voltage applications. The present paper studies the generalization of such a converter to a resonant version, not already used in high power applications, analyzing...

The Modular Multilevel Converter (MMC) concept is a modern energy conversion structure that stands out for a number of interesting features that opens wide application chances in Power Systems, for example for efficient grid integration of renewable sources. In these high-voltage, high-power application fields, a high efficiency is mandatory....

Sensorless algorithms for PMSM have achieved an increasing interest in the technical literature. They can be divided into active methods and passive methods. Active methods exploit rotor anisotropy by injecting high voltage frequency signals, whereas passive methods are based on observers. Even if passive methods do not have the drawbacks of...

One of the most important innovation expectation in railway electrical equipment is the replacement of the on-board transformer with a high power converter. Since the transformer operates at line-frequency (i.e., 50 Hz or 16 2/3 Hz), it represents a critical component from weight point of view and, moreover, it is characterized by quite poor...

In this paper, a novel approach to determine the model of an ICNL (Independently Controlled Neutral Leg) is proposed. Based on this model, a cascaded control method is developed to provide a steady neutral point connection for a three-phase four-wire inverter and to balance the two DC capacitors voltages of a split DC-bus. Validation of the...

In this paper, starting from the measurements available for a 2000 cm3 turbocharged diesel engine, an analytical model of the turbocharger is proposed and validated. The model is then used to extrapolate the efficiency of a power unit with a diesel engine combined with a turbocompound system. The obtained efficiency map is used to evaluate the...

In this paper an exhaustive study on the effects of the circulating currents in the modular multilevel converter in HVDC applications is presented. In the first part, an analytical study of the converter is reported, with emphasis on the capacitors voltage ripple in presence of different circulating currents. In particular, the effects of the...