Autonomous power management for interlinked AC-DC microgrids

Abstract

Abstract-The existing power management schemes for interlinked AC-DC microgrids have several operational drawbacks. Some of the existing control schemes are designed with the main objective of sharing power among the interlinked microgrids based on their loading conditions, while other schemes regulate the voltage of the interlinked microgrids without considering the specific loading conditions. However, the existing schemes cannot achieve both objectives efficiently. To address these issues, an autonomous power management scheme is proposed, which explicitly considers the specific loading condition of the DC microgrid before importing power from the interlinked AC microgrid. This strategy enables voltage regulation in the DC microgrid, and also reduces the number of converters in operation. The proposed scheme is fully autonomous while it retains the plug-nplay features for generators and tie-converters. The performance of the proposed control scheme has been validated under different operating scenarios. The results demonstrate the effectiveness of the proposed scheme in managing the power deficit in the DC microgrid efficiently and autonomously while maintaining the better voltage regulation in the DC microgrid.

Grid Integration of a Dual Two-Level Voltage-Source Inverter Considering Grid Impedance and Phase-Locked Loop

“…In this regard, all nonlinear equations are linearized around the given operating point and arranged in the form of ∆𝑋 ̇= 𝐴∆𝑋 + 𝐵∆𝑈. Therefore, the linear state-space model of the grid-connected DTL VSI is given in (17). It is in the form of ∆𝑋 ̇= 𝐴∆𝑋 + 𝐵∆𝑈-in which the state and input matrices, i.e., A and B, are equal to M -1 Ad, and M -1 Bd.…”

“…At11 and At12 are expressed by (A6) and (A7) in Appendix, respectively. Moreover, the matrix N is exactly the same as its counterpart in (17), which is termed as M. Note that, in (18) and (A1)-(A8) in Appendix, ∆, the subscript "0," Vm, and α0 are the same as those defined in (A1)-(A5). The linearized model of ( 18) has been validated by comparing its time-domain simulation with that of nonlinear switching experiments.…”

Dual Stator Winding Induction Generator (DSWIG) used as base Source in Hybrid Power Systems when Lost the Power

“…The main effect in using a micro grid is the fact that this way we can eliminate the dependence on diesel gensets. While some micro grids were typically powered by diesel, these micro grid architecture proposed in this paper can be powered by fuel cells, solar, wind, combined heat and power, and batteries instead of or in addition to diesel [4][5][6][7].…”

Real Time Energy Management and Control of Renewable Energy based Microgrid in Grid Connected and Island Modes

“…In this mode, DERs operate in a maximum power point tracking (MPPT) mode and deliver maximum power to the grid. In islanded mode, the microgrid disconnects itself from the main grid and supplies the load from the DERs [10,11]. In both operation modes, the balance between power demand and supply is one of the most important criteria in managing the microgrid.…”