New Electricity Distribution Paradigm in Distribution Systems for DC Devices Integration

A new electricity distribution scheme in distribution systems is proposed in this paper. The AC and DC power sources are controlled to inject AC and DC simultaneously into distribution lines. LC filters are designed in a new way to extract AC and DC from their superposition in the distribution line current for the AC and DC devices, respectively. Therefore, the DC power sources, e.g., solar panels, can directly inject DC without the DC/AC conversions. Moreover, the AC and DC loads can be supplied directly with AC and DC, respectively, without the AC/DC or DC/AC conversions. The equipment cost and the power loss associated with these conversions are thus reduced. Simulation results show that the proposed scheme can regulate the AC and DC load voltage and drive the renewable energy resources-powered DC voltage sources to follow their maximum power point tracking profiles.