Enhanced Frequency Droop Method for load sharing in LVDC power systems

The main objectives of a load sharing control in dc power systems are proper power sharing among dc sources with an acceptable voltage regulation through the grid. Virtual resistor based droop methods also called voltage droop methods have low performance and accuracy. Hence, supervisory controllers reinforced by a communication system are required to improve the effectiveness of the voltage droop methods. Furthermore, frequency droop approaches have been presented for accurate load sharing control in dc power systems without utilizing a communication system. However, the ripples are superimposed on voltage and current waveforms affecting overall system efficiency and power quality. This paper proposes an Enhanced Frequency Droop Method (EFDM) to overcome the main drawbacks of the frequency droop approaches by stopping voltage superimposing at steady state. Preliminary simulation results show the effectiveness of the proposed approach.