1,720,991 research outputs found
NPFC: Inverter polifase a tre livelli di tipo NPC con capacità di controllare la tensione del punto centrale e/o il fattore di potenza
No full textnuova topologia di inverter multilivell
NFC: Inverter polifase modulare a moduli NPC (n) con circuito boost set up per low frequency control (FC)
No full textnuova topologia con controllo delle componenti armoniche di bassa frequenz
Extending the operating range in diode-clamped multilevel inverters with active front ends
No full textA 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, analytically obtained and each result is verified using energetic considerations: the voltage variation of all capacitors due to the inverter must correspond to the energy drawn by the load and must be supplied by the AFE. The main results are shown and several simulation results in particular working conditions are presented in order to verify the general analytical computations
A Rogowski coil for high voltage applications
No full textThe design of a large bandwidth Rogowski probe for very
high voltage applications is considered, based on the analysis of
stray capacitance and shielding issues. The Rogowski is interfaced
to the measuring instrument through a high CMRR instrumentation
amplifier. The focus is on electric field rejection rather than
insulation, that is ensured with optical or radio link. Target
application is the current measurement on high voltage electric
railway and power transmission and distribution lines
Strutture di conversione multilivello modulari per azionamenti di motori in ca in media tensione: miglioramento delle prestazioni
No full text
Optimal operation mode for Modular Multilevel Converter based HVDC
No full textIn 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 voltage ripple in a general working point are object of investigation. The main four working points, inverter, rectifier, inductive and capacitive, are studied in detail
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