A high performance auxiliary power supply (APS) plays a crucial role in ensuring the reliability and safety of power converter systems. In this paper, a Class E-based multichannel APS, featured with simple circuit structure, zerovoltage-switching (ZVS) realization, and stable output voltage against loads variations, is proposed for medium-voltage applications. Design considerations for obtaining the required output power and realizing load independent ZVS operation are also discussed. Experimental results are shown to demonstrate the feasibility of the converter and the effectiveness of the design.
This paper introduces a hybrid chain-link push-pull series connected (H-CL-P2SC) modular multilevel converter for HVDC applications, especially for those considering a connection of off-shore wind farms to the grid. On the ac side, each converter phase is connected to the corresponding grid phase via a single-phase center-tapped transformer whereas on the dc side, the converter phases are connected in series. The required functionality of the chain-link (CL) inductors in other modular multilevel topologies is achieved by using the leakage inductance of each transformer. As a result, the converter does not require separate CL inductors. Since the phases are series connected on the dc side, the H-CL-P2SC requires 33.3% less cells (NCs) to withstand the same dc voltage when compared to the standard modular multilevel converter (M2C). A control strategy for the H-CL-P2SC is discussed in detail. The global and internal power balance controllers are illustrated with block diagrams. A numerical comparison between the H-CL-P2SC and other typologies is also presented. Finally, the response of the H-CL-P2SC to a dc pole-to-pole (P2P) fault is shown using PLECS simulations for a 20 MW-20 kV demonstrator.
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