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In this paper a comparison between a 5 and 6 phases alternator is achieved. The target is to show how the 5-phase structure may influence the alternator performance comparing with a classical 6-phase configuration. Current and voltage harmonics of both 5 and 6 phases alternator provided with a bridge rectifier are analyzed. The impact of the phase current third harmonic on the output power in 5-phase...
Power electronic technology has been widely employed in renewable energy systems, like photovoltaic(PV) generation systems, wind generation systems; in home appliances, like compact fluorescent lamps (CFLs), LED lamps, microwaves. However, power electronic based devices are harmonic polluters, which could inject a relatively large amount of harmonics into the power grid relative to their power demand...
This paper presents for the first time an experimental validation of the continuous inverse class-F mode with varying the voltage waveforms, also known as inverse class-FJ. Starting from the standard inverse class-F condition and varying fundamental and third harmonic impedances whilst maintaining an open-circuit second harmonic load it will be demonstrated that output power and drain efficiency can...
The proportion of renewable energies in power generation has increased according to the political aims in recent years. In low-voltage grids, these are mostly decentralized renewable energy systems such as photovoltaic (PV) that are connected through the inverters to the grid. The temporary reversal of the power flow causes overvoltage problems. Consequently, regenerative sources need to be turned...
This contribution presents the application of Envelope Tracking technique on a LDMOS 2nd harmonic tuned PA, designed to operate at 2.14 GHz. Accounting for the input dynamic signal, optimum drain and gate bias voltages are derived starting from a simplified model of the active device. Experimental results give an increase up to 40% in average efficiency, when bias tracking is applied. The application...
The end-consumers need high quality of electrical energy like safe, continuous voltage supply with the required current at constant rms values and at constant frequency, then pure sinusoid waveform of voltage. If the rated voltage of computers will be dropping down to its 75% the disturbance in their operation appears and at 50% they will loose their ability for work, then the acquired data, the envisaged...
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