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This paper reports on the stability condition of the DC 300-V distribution network of a demonstrative project on power supply systems offering different service levels analyzed by SPICE simulation. To improve the simulation accuracy, we measured some characteristics of actual devices and incorporated them into the simulation models. Using these models, we repeated the simulation and evaluation of network stability while changing both the length of the feeders and the capacitance of the capacitors in the network. Finally, the relationship among those values required to keep the network stable was derived.