Abstract-Even though multipulse rectifiers are a long established and well-known technology, still their behavior is not fully described in the literature when they are fed by three-phase balanced sinusoidal currents sources. To address the aforementioned gap, this work presents the operation and properties of current-fed multipulse rectifiers. The undertaken aim is achieved by analyzing the examined topology through circuit analysis and then, the theoretical results are validated through comparisons with the simulated waveforms and experimental results. Furthermore, the expected harmonic content and the duality with traditional voltage-fed multipulse rectifiers are presented. In the proposed structure, the transformer voltages present a multipulse waveform, instead of its primary currents as in voltage-fed multipulse rectifiers. This implies on limiting the voltage steps and its derivative which might be beneficial to reduce cost and volume of insulation, particularly for MVDC and HVDC applications. Besides that, by actively controlling the primary currents, a possible copper loss reduction is shown in the transformer windings, differentiating the proposed structure from its voltage controlled counterpart.
Aiming to address the growth and the integration of renewable sources and electronic loads, different types of dc-dc topologies with specific features have been proposed, going from medium frequency isolated Modular Multilevel Converter to Switched Capacitor and Hybrid Switched Capacitor topologies. In this paper, a bidirectional Modular Multilevel Converter based Hybrid Switched Capacitor dc-dc converter is presented, featuring transformerless structure, automatic total arm voltages clamping/balancing, voltage static gain independent of the submodules quantity and efficiency with reduced duty cycle influence. The topology operates with a Quasi-Two-Level modulation, which provides passive components volume/weight reduction, a degree of freedom regarding the dv/dt applied on the magnetic windings and basis to perform the submodule capacitor voltages equalization within each arm. The topology operating principles are approached by an average value static analysis, while an instant value static analysis is used to estimate the operating current spike worst case. A 1.17 kW, 350/200 V laboratory scale prototype using IGBTs is implemented to experimentally confirm the theoretical approaches.
Abstract鈥擜iming to address the growth and the integration of renewable sources and electronic loads, different types of dc-dc topologies with specific features have been proposed, going from medium frequency isolated Modular Multilevel Converter to Switched Capacitor and Hybrid Switched Capacitor topologies. In this paper, a bidirectional Modular Multilevel Converter based Hybrid Switched Capacitor dc-dc converter is presented, featuring transformerless structure, automatic total arm voltages clamping/balancing, voltage static gain independent of the submodules quantity and efficiency with reduced duty cycle influence. The topology operates with a Quasi-Two-Level modulation, which provides passive components volume/weight reduction, a degree of freedom regarding the dv/dt applied on the magnetic windings and basis to perform the submodule capacitor voltages equalization within each arm. The topology operating principles are approached by an average value static analysis while an instant value static analysis is used to estimate the operating current spike worst case. A 1.17 kW, 350/200 V laboratory scale prototype using IGBTs is implemented to experimentally confirm the theoretical approaches. <br>
<p> A switching cell based on Hybrid Switched Capacitor and Modular Multilevel Converters is presented.<br> Automatic arms voltages clamping are achieved, while the current spikes and the efficiency dependence<br> on duty cycle can be reduced by a proper design. A Buck type topology simulation and experimental<br> results are presented and an example of cell application as a single-phase inverter is shown.<br> </p>
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