An efficient dynamic power management model for a stand-alone DC Microgrid using CPIHC technique

N. Sharmila, K. R. Rekha, Rekha K R


The power generation using solar photo voltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to have reliable operation of the microgrid. This work presents management of dynamic power using decentralized approach. The control techniques including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability, and power balance of the microgrid have few limitations. PI controllers alone will not offer complete stability of the microgrid. Their parameters cannot be optimized for varying demand and has slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and the error in steady state voltage makes the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating a combined PI and hysteresis controller (CPIHC) technique. The system becomes more robust, performs well under varying demand conditions and shows faster dynamic response. The DC microgrid has solar PV as the energy source and lead acid battery as the energy storage system, constant and dynamic loads. The incremental conductance maximum power point tracking algorithm is incorporated to operate the PV module at maximum efficiency. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates the DC link voltage and battery state of charge (SoC) in comparison to the conventional combined PI and droop controller (CPIDC).


Combined PI and droop controller, Hysteresis control, Maximum power point tracking, Photovoltaic, Proportional-integral, Voltage source converters



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