Abstract
Since the multiple PVs will be connected with bipolar Low-Voltage DC (LVDC) distribution system in the future, several problems caused by PV should be analyzed. In order to speed up to introduction of LVDC distribution system, the effect of PV on the voltage unbalance, which is one of the several issues, should be surely studied because it can lead to the power loss and debase the power quality of LVDC distribution system. This paper has analyzed the voltage unbalance by classifying upstream and downstream of PV. As a result, PV contributes the voltage unbalance to upstream area of Point of Common Coupling (PCC). For downstream area of PCC, however, the voltage unbalance caused by PV is absent theoretically and the voltage unbalance occurred by upstream is just sustained in downstream. Finally, this paper has modeled a test system using ElectroMagnetic Transients Program (EMTP) and the proposed results are verified by the simulation for several cases.
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