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Power Matching Point Tracking Method to Regulate Bus Voltage in DC Distribution Systems

This paper proposes a new method called Power Matching Point Tracking (PMPT) to regulate dc-bus voltage in dc distribution systems with no grid information, and without contributing the solar DC-DC converter. This task in a generic DC distribution system with photovoltaic (PV) as the distribution generation resource, is undertaken through MPPT control in the solar DC-DC converter. With eliminating this converter, and consequently improved reliability, and efficiency due to the removal of the power conversion unit, the proposed PMPT method can intelligently and efficiently operate in islanding mode when load shedding/surplus are employed to regulate the DC bus voltage with providing the demand response requirements. In addition, this method enables controllable loads to ride-through grid outages, and adjust the load required to meet the power balance in the islanded mode. The simulation and experimental results are presented to indicate that the proposed system can satisfactorily regulate the common bus voltage, and ride through the blackout.