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Repetitive control can be effective in improving current quality when used with grid-connected inverters. Mathematically, a repetitive controller is equivalent to a parallel combination of resonant controllers with high gain at the fundamental frequency and its harmonics, and accordingly good disturbance rejection can be achieved at these frequencies. To ensure stability, a low-pass filter needs to...
This paper presents a review of the state of the art of power electric converters used in microgrids. The paper focuses primarily on grid connected converters. Different topologies and control and modulation strategies for these specific converters are critically reviewed. Moreover, future challenges in respect of these converters are identified along with their potential solutions.
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