Integrated control scheme for dynamic power management with improved voltage regulation in DC microgrid
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ORIGINAL ARTICLE
Integrated control scheme for dynamic power management with improved voltage regulation in DC microgrid Rohit R. Deshmukh1 · Makarand S. Ballal1 Received: 15 April 2020 / Revised: 29 August 2020 / Accepted: 1 September 2020 © The Korean Institute of Power Electronics 2020
Abstract This article presents an integrated control scheme to improve power sharing for power management and voltage regulation in DC microgrids. The proposed scheme considers the available power and the stochastic nature of sources to achieve adequate power sharing among them. Therefore, it achieves effective utilization of each source. In addition, the effective use of energy storage systems (ESSs) is also achieved by reducing their charging/discharging cycles. The proposed control scheme improves voltage regulation under various operating conditions. It enhances the stability of microgrids and improves their dynamic response. The proposed control scheme is adaptive to changes in the source or load. It operates without historical/ previous data, which reduces the computational burden. The proposed control scheme is experimentally validated under diverse operating conditions. Keywords Available power · DC microgrid · Power management · Voltage regulation
1 Introduction DC microgrids are gaining more attraction with renewable energy sources (RES). They have advantages such as higher efficiency, since their power conversion stages are reduced, no reactive power requirement, less complexity in controller design, increased controllability, etc. The major problems related to DC microgrids are efficient converter design, system voltage control, power flow control with sharing between sources, energy management, etc. The available source power in every RES is an important feature that needs to be considered for the effective power management in microgrids. The challenge in the control of microgrids arises from the uncertainties in RES, such as solar and wind, due to their intermittent power generation. Uncertainties in load demands and schedules, as well as the distributed topologies of power sources that are spatially scattered due to location and size constraints effect the control schemes [1–6]. The available power in a source is based on distinct time varying and designed factors.
* Rohit R. Deshmukh [email protected] 1
Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India
The state-of-the-art techniques for load sharing among the sources is mostly divided into master–slave control and droop control. In master–slave control, most of the sources are controlled in the current control mode. It is often used for power management within a microgrid in the islanded mode or grid connected mode [7, 8]. The drawback of these methods is the failure of voltage controlled source. To overcome this issue the changeover of voltage controlled source is given in [9, 10]. However, extensive communication is required with updated information regarding average load demand references. In
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