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Fault current limiters (FCLs) are one of the main solutions to upcoming challenges in the microgrid protection. Regarding the high penetration of distributed generations (DGs) in the future power system, designing cheap and effective FCLs is a necessity. This letter addresses this issue by proposing an embedded FCL operating based on modifying the secondary control of the inverter. As this method is presented for a four-wire system, besides very low implementing cost, it has independency and flexibility to only limit the current of the DG faulted phase. This letter also provides real-time simulation results by real time simulator (OPAL-RT) to compare the proposed method with a virtual-impedance-based FCL to validate its effectiveness. Finally, experimental results are presented to validate the effectiveness of the proposed FCL. [ABSTRACT FROM AUTHOR]

This paper identifies the characteristics of a current source inverter operating in discontinuous conduction mode, and proposes a new multiobjective pulse-width modulation (PWM) method to mitigate voltage boosting and harmonic distortion effects. The method takes into account load impedance effects. Controls are also developed to enable transition between the multiobjective PWM method and conventional PWM as the current source inverter operates in discontinuous and continuous modes of operation. The concept is verified experimentally on a 3 kW test bed. [ABSTRACT FROM AUTHOR]

Evaluates the suitability of a soft-switched actively clamped resonant direct current-link (ACRDCL) inverter for low-output harmonic distortion high-power-density power conversion. Details on the ACRDCL inverter; Discussion of system design issues; Comparisons of hard-switched inverters.