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DC-link capacitors are usually utilized in voltage source converters to stabilize the DC-link voltage and suppress the transmission of current harmonics into the power grid. To guarantee the reliability of voltage source converters, in addition to select the DC-link capacitors with optimum capacitance, appropriate rated voltage and enough ripple current capacity, thermal design is also of great importance...
The multilevel converter is a prospective topology for both Medium Voltage and High Voltage Direct Current (HVDC) applications. In high power application, the forward topology is applied to increase the power region. In this paper, a novel forward-mode five-level inverter is presented which combines the features of the conventional multilevel converters and forward topology. The converters can transfer...
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
DC capacitor voltage imbalance is an inherent problem limited the further development of multi-level Neutral Point Clamped (NPC). In this paper, a new hybrid control method based on Space Vector Pulse Width Modulation (SVPWM) for five-level NPC at high modulation index and high power factor is presented. By choosing appropriate switching pattern in lower modulation index sectors and collocating different...
Cascaded H-bridge multilevel inverters have been very popular in medium-voltage applications. The hybrid CHB multilevel inverter, using dc supplies with different voltages, is an improvement of cascaded H-bridge multilevel inverters. The main advantage of hybrid CHB multilevel inverters is the optimization of levels with a minimum number of power supplies. But in some occasions, there can be only...
A circuit topology of the forward-mode three-level inverter is proposed. The kind of circuit topologies are constituted of three-level converter, high frequency transformer, output cycloconverter, output filter and so on. The inverter has the advantages such as simple topology, two-stage power conversions(DC/HFAC/LFAC), bidirectional power flow, high frequency electrical isolation, three-level voltage...
A novel three-level buck-boost type inverter is proposed in this paper. It combines the series-parallel diode-capacitor network with the traditional buck-boost converter, plus the full bridge inverter as the back stage. The new inverter can boost or lower the input voltage. The operation principle of the inverter is investigated, theoretical waveforms are shown, relevant formulas are deducted. The...
There are many researches on Z-source/Quasi-Z-source inverters since the topology was proposed in 2002 by Professor F.Z. Peng. This inverter can cover the shortage of traditional inverters. Almost all of the researches are studied in a circuit structure of single-stage. The original Z-source/Quasi-Z-source cannot achieve electrical isolation between input and output. The high frequency transformer...
Hybrid electric vehicle technology demands for power modules which are highly reliable, compact, economical and rugged enough to withstand mechanical, electrical and thermal shocks. Increasing the power density of the latest power module is the top most trend in power semiconductor development; similar trend is seen in the hybrid electric vehicle technology more due to the space and weight constraints...
The novel full-bridge mode inverters with high frequency link are constituted of high frequency inverter bridge, high frequency transformer, cycloconverter, input and output filters. The converters have the full bridge-full wave and the full bridge-full bridge mode circuit topologies. The control strategy, principle characteristics, design criteria of the key circuit parameters and principle test...
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