A novel dc bus‐signaling based power management strategy for dc microgrid

Abstract

Summary This article presents a novel power management strategy for a dc microgrid based on dc bus‐signaling method. The dc microgrid has two subgrids connected through an interlinking bi‐directional dc/dc converter (IBD). In each subgrid, a novel charging and discharging power‐based droop control and state‐of‐charge (SoC) based droop control of the battery are designed to regulate the dc bus voltage. Considering the dc bus voltages, a power management controller is implemented for IBD. It operates by the normalized voltages of subgrids. IBD helps to regulate the dc bus voltages by sharing power among the subgrids. Further, a coordinated power control method is applied to the distributed generation (DG) controller. In full‐charging mode or high SoC mode of battery, it regulates the DG power generation. Hence, storage and generation coordination can be achieved. In an overloaded case, a load curtailment process is developed to regulate the dc bus voltage at its lower cut off value. The dc bus voltages act as information carriers to IBD and DG controllers. Hence, the proposed method does not depend on the communication line, which improves system reliability. The power management strategy has been implemented in islanded dc microgrid in Matlab/Simulink. Its results are compared with the conventional dc bus‐signaling method to analyze its effectiveness.

A Fuzzy-Based Coordinated Power Management Strategy for Voltage Regulation and State-of-Charge Balancing in Multiple Subgrid-Based DC Microgrid

“…Further, it can be observed that the charging power of BS-1 is higher than the charging power of BS-2. Parameters Ref [20] Ref [21] Ref [31] Ref [32] Ref [35] Ref [36] Proposed Moreover, BS-1 always operates in charging mode during the experiment, and BS-2 operates in discharging mode. From Figure 15(b), it can be observed that, with fast charging and fast discharging operation, the SoC of BS-1 increases to 25.7%, and the SoC of BS-2 decreases to 94%.…”

“…Further, e PV generation in each subgrid operates in maximum powerpoint tracking (MPPT) mode or power control mode. Hence, for the PV generation regulation, the existing control strategy in [31] is implemented. A detailed analysis of PV controller is not discussed in this paper.…”

Mitigating voltage deviation, SOCs difference, and currents disparity in DC microgrids using a novel piecewise SOC‐based control method

“…These manipulations in droop curve parameters are done in such a way that the higher SOC units discharge more and charge less. The droop curve shift technique is utilized in [36,37] such that the conventional droop is equipped with the SOCs balancing capability. The linear, exponential, inverse, and logarithmic curves are suggested in [38][39].…”

A comprehensive review of DC microgrid in market segments and control technique

“…The voltage variation caused by voltage droop is removed using a PI controller for secondary regulation [ 82 ]. For Island DC microgrid, the reference provides a DC bus signaling secondary control [ 83 ].…”