To meet the voltage levels shown in Section 2, the DC bus voltage in the MPPT area should be between 49.2 V and 45.6 V, with the solar converter injecting 4.1 A and 4.4 A, respectively.
The proposed DC bus voltage regulation method can effectively suppress high voltage fluctuation by charging and discharging the distributed ESSs implemented at the end sides. It can regulate the DC bus voltage without additional communication with the neighboring circuit and algorithm by charging and discharging sequences of the distributed ESSs.
The validity of the proposed control scheme has been verified by the hardware-in-the-loop simulation (HILS) results. In this paper, a novel voltage controller of energy storage system (ESS) in DC microgrids (DC-MG) is proposed to enhance the DC-bus voltage stability. At first, a mathematical model of the DC-MG is developed in a state-space form.
The proposed grid voltage regulation scheme using the distributed ESSs could regulate DC bus voltage in real time, regardless of the structure of the DC microgrid without external communication. Lastly, experimental results using a lab-scale bipolar DC microgrid prototype verified the proposed method.
With the objective of DC bus voltage stabilization, the controllers were tuned using the Nelder–Mead simplex search technique to evaluate the different performance criteria in the stability analysis. Parameters of the system under investigation are listed in Table 2 for better clarity.
Although the AC/DC converter that interfaces the DC microgrid and AC grid regulates DC bus voltage, the DC bus voltage of the DC microgrid can suffer from severe under- and overvoltage fault conditions. In this section, the under- and overvoltage conditions of bipolar DC bus voltage are analyzed. 2.1. Limited Power Capacity of AC/DC Converter
DC bus voltage control strategy based on hybrid energy storage
In view of the fluctuation of DC bus voltage caused by the load change of power system, a method based on hybrid energy storage system control is proposed to stabilize the bus voltage of microgrid.
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