A novel decentralized voltage control method for direct current microgrids with sensitive loads

Abstract

Summary Low‐voltage direct current (DC) microgrids will have a significant position in smart grids. Of course, currently, DC microgrids are mainly used in the areas with sensitive electrical loads. The main issue in these microgrids is the voltage control. In this paper, a practical, reliable, modular, autonomous, and decentralized voltage control method, namely the voltage‐based power‐voltage (VbPV) control method, is proposed for the most common type of DC microgrids, that is, the DC microgrids with sensitive loads. The proposed voltage control method leads to the flattest voltage profile, which is essential for the DC microgrids. Besides, the presented method minimizes the power loss and maximizes the line capacity release. It is noteworthy that the VbPV control method requires no telecommunication infrastructure. Furthermore, contrary to some other DC voltage control methods, it is applicable to different real DC microgrids. Here, some numerical examples are mentioned to discuss and clarify the remarkable achievements of the VbPV control method. The analytic and simulation results confirm the successful performance of the VbPV control method. Copyright © 2013 John Wiley & Sons, Ltd.

Review of hierarchical control in DC microgrids

“…Obviously, V Fault of all the sources in the DC MG is the same. Analysis about the choice of the parameters is carried out in [23], while numerical simulations for a realistic DC MG are performed proving the good performance of this control method.…”

“…A novel variant of the droop control is called the voltage-based power-voltage control method (VbPV) [23]. The VbPV control method provides the flattest and approximately nominal voltage profile, which is necessary for the operation of sensitive loads, regardless of the size and structure of the DC MGs.…”

Cyber-physical cooperative control strategy for islanded micro-grid considering communication interruption

“…But when using this method, there is also a biggest problem: The obtained output frequency and voltages of the controlled DERs are not the reference values. [15][16][17][18] Therefore, the secondary control is usually required to adjust the output frequency and voltages of DERs again. 19 And there were a lot of researches on secondary control, such as a two-level decentralized optimization power-dispatch control was proposed in Dou et al 20 There were two layers of the control strategy (the lower layer of the strategy is to control the operation of DER, and the upper layer is for optimize the control effect).…”

“…And recently, the droop control is a method that is most commonly used for the control of inverters in the islanded micro‐grid. But when using this method, there is also a biggest problem: The obtained output frequency and voltages of the controlled DERs are not the reference values . Therefore, the secondary control is usually required to adjust the output frequency and voltages of DERs again .…”

A novel slack bus-free load flow method for dc microgrids and distribution systems with dc-bus signaling control methods

“…Considering these points, the existing distribution load flow methods used for conventional dc power systems cannot be applied to dc microgrids and distribution systems with DBS control methods. On the other hand, none of the literature dealing with DBS control methods proposed a proper load flow method for the dc power system.…”