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Last name: VACCARO
First name: Luis Ramon
nuova topologia di inverter multilivello
nuova topologia con controllo delle componenti armoniche di bassa frequenza
A new modulation scheme, optimized for achieving a correct dc-link capacitor voltages balance in Diode-Clamped Multilevel inverters with Active Front End (AFE), beyond the limits found in the past, is presented. A detailed explanation of the new technique and how the optimization is achieved are presented. The results are completely general,...
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In this paper the effects of the circulating currents on the modular multilevel converter, for HVDC applications, are presented. The first part is a review of an analytical study of the converter, aimed to minimize the capacitors rms current. In the second part the effects on the converter efficiency and on the safe operating area (SOA) margins...
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High-power converters with a medium frequency inductive coupling, commonly referred as Power Electronic Transformers, Medium Frequency Topologies, Solid-State Transformers (SST), or other similar acronyms, have been certainly one of the most important innovations expectations - for many years - in the field of electrical equipment of the...
In this paper the reliability of a Modular Multilevel Converter for HVDC applications is incremented, by decreasing the electrical stress of the main passive component suitable to fault, that is, the capacitor cell. This effect is obtained with the injection of a suitable cell second harmonic circulating current. It's important to note how the...
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In this paper an analytical study on the Modular Multilevel Converter architecture applied to HVDC is presented. The influence of the circulating injected currents on the converter performance is the main object of this analysis. In particular, the influence of the second and fourth harmonics circulating injected current on the capacitor...
A new generalized space vector modulator for cascaded multilevel converters is presented, featuring centralized control, fault tolerant and common mode voltage reduction capabilities. The SVPWM technique is based on the redundancy properties inherent in multilevel modulation schemes and is validated through a case study. Simulation and...
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A new algorithm for position and speed estimation in permanent magnet synchronous motors is presented, which is based on the high frequency signal injection and uses an algebraic approach. Motor inductances are estimated by simple mathematical relationships and motor position and speed are tracked using a phase locked loop technique. The...
A new generalized fault tolerant space vector modulator for cascaded multilevel converters is presented. Exploiting the redundancy properties inherent in multilevel modulation schemes, a generalized space vector modulation algorithm is devised, also aimed to the extension of the normal, full rated operation, to a limited rate, fault tolerant...
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Two new fault tolerant multilevel PWM techniques, devoted to the command of Cascaded Multilevel (CM) converters, are presented: a Sine PWM with interleaved carriers technique and a Space Vector PWM technique, based on the redundancy properties inherent in multilevel modulation schemes. A performance comparison among the new devised PWM...
A new PWM technique, capable of achieving a correct dc-link capacitor voltages balance in Diode-Clamped Multilevel inverters with Active Front End (AFE), beyond the limits defined by the theory for converters without AFE, is presented. A detailed explanation of the new devised PWM technique and the main results are reported with analytical computations.