Dynamic and Steady-State Behavior of Distributed Power Supply in DC Architecture with Minimized DC Bus Capacitor

Dynamic and steady-State behavior of distributed power Supply in DC architecture with minimized DC bus capacitor is investigated in this paper, based on power balance control technique. The circuit is simulated and analyzed by MATLAB Simulink. The proposed system significantly improves the dynamic response of the converter to load steps with minimized dc bus capacitor for Distributed Power System. The possibility of using, in the proposed system, a reduced ratio capacitance/watt lower than the typical values used in commercial applications, while maintaining the output voltage regulation, is also theoretically proved. The minimized DC bus capacitors of the proposed system are $100\mu\mathrm{F}\ (0.1\mu 1{\mathrm{F}/\mathrm{W}})$ for 380V dc bus, $400\mu\mathrm{F}(0.47\mu \mathrm{F}/\mathrm{W})$ for $100\text{Vdc}$ bus, $80\mu \mathrm{F}(0.53\mu \mathrm{F}/\mathrm{W})$ for $60\text{Vdc}$ bus, $100\mu \mathrm{F}\ (0.67\mu \mathrm{F}/\mathrm{W})$ for $48\text{Vdc}$ bus, $2000\mu\mathrm{F}(5 \mu \mathrm{F}/\mathrm{W})$ for 24V de bus and $2000\mu \mathrm{F}\ (5\mu \mathrm{F}/\mathrm{W})$ for 12V dc bus. The simulation results show the following advantages: small capacitor size, reduced converter volume, good steady-state behavior, and fast dynamic transient response.