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The ac loads cause the dc-bus voltage and the source current to oscillate at twice the ac supply frequency (fac). These oscillations have detrimental effects on sources and converter components. A distributed control strategy is proposed to regulate the current ripples propagating to the sources, in a dc microgrid feeding both the ac and dc loads. The proposed control methodology regulates the output impedance of the source interfacing dc–dc converter dynamically at2fac. The impedance is increased virtually in series with the inductor of the dc–dc converter by a dedicated controller, which regulates the ripple magnitude according to the harmonic reference. Using this, the second-order ripple currents can be mitigated or propagated to the nodes having some ripple absorbing circuits or filters. This improves energy density in ripple filters installed at a node and optimal usage of the dc-link capacitor at node terminals is achieved. The proposed second-order ripple current (SRC) regulation is analyzed in the presence of component variations and communication delay between the nodes. A low-bandwidth communication is incorporated so as to facilitate the per-unit current exchange between the nodes for the proportional dc load sharing. The proposed concept is verified through simulation and experimentation.
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Chaturvedi et al. (2021) studied this question.
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