Abstract
Due to the rapid development of power electronics technology and modernization of DC based loads, DC microgrids (DCMG) are becoming most attractive solution in terms of their increased efficiency and high power quality. However they face certain challenges like intermittency of renewable energy sources, limitations in dynamic behaviour of storage systems and various stability issues during islanding. Thus it is mandatory to select the DCMG components properly with a robust control strategy for power converters in order to maintain power balance despite of variation in source and load power in order maintain the system power quality. In this work, a DC bus signalling based decentralized control strategy is proposed for a PV based DCMG, which eliminates the risk associated with DC bus voltage fluctuation. Fuel cell is as an auxiliary power source along with solar PV and storage devices, reduces the possibility of black out and helps to increase system reliability. The proposed control strategy has been validated through MATLAB/Simulink based simulation studies for variable weather condition and load demand on DCMG system.
Highlights
A PV based DC microgrids (DCMG) system with hybrid energy storage system (HESS), comprising of battery and SC both is considered for study
PV operates at MPPT, SC power (Psc ) maintains the DC bus voltage, battery maintains a certain SC voltage level by supplying required charging/discharging power to the system according to equ
A DCMG system is designed to get high reliability in terms of uninterruptable power supply and the quality of power is maintained by always limiting load end voltage variation
Summary
Secondary control is of two types, centralized and decentralized. Centralized controller mainly mitigates the voltage imbalance caused by primary control, but it needs a real time communication system for operation. Decentralized control can be modelled with or without communication system. The communication problem can be eliminated with DC bus signalling technique [12]. A PV based DCMG system with hybrid energy storage system (HESS), comprising of battery and SC both is considered for study. A FC is considered for the emergency condition to minimize load shedding. A DC bus signalling based decentralized control algorithm is formulated for this DCMG system where the DC bus voltage is used as the key parameter to decide the system operating modes and the control signals for local controllers are computed
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