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This paper reports a comprehensive optimization process of the associated passive components of three-phase front-end interleaved boost converters to enhance the power density. The effects of the circulating zero-sequence current between the rectifiers were analyzed in detail, and the mean input current model was developed in the presence of a circulating current. The model was then incorporated into the development of a physics-based average current controller to compensate for the input current low-order harmonic distortions without sacrificing the system power density. The proposed method is expected to be an attractive solution for enhancing the power density of consumer electronic applications needed to meet the harmonic regulations. [ABSTRACT FROM AUTHOR]

Recently, the interest in offshore wind farms has been significantly increased because of the stronger and more stable winds at sea, which will lead to a higher power production. DC/DC power conversion solutions are becoming more popular for fulfilling the growing challenges in the high-voltage (HV) dc-connected offshore wind power industry. This paper presents several multilevel modular dc/dc conversion systems based on the capacitor-clamped (CC) module concept for high-power offshore wind energy applications. Two types of the CC modules, namely, the double-switch (DS) module and the switchless (SL) module, are discussed. A soft-switching technique is adopted to achieve minimal switching losses and the maximum system efficiency. Theoretical analysis is carried out for the $2n+1$-level cascaded configurations based on the CC modules. The inherent interleaving property of the proposed configurations effectively reduces the output voltage ripple without adding extra components. A cascaded hybrid topology is developed by the combination of DS and SL modules. The proposed hybrid topology achieves higher efficiency and lower component count. The cascaded hybrid approach is evaluated in terms of the power device count, reliability, and efficiency against other HV dc/dc topologies to demonstrate its advantage for HVDC-connected offshore wind farms. The experimental results of two 5-kW prototype CC converters are presented to validate the theoretical analysis and principles as well as attest the feasibility of the proposed topologies. [ABSTRACT FROM PUBLISHER]