Microgrids have a long history. In fact, Thomas Edison‘s first power plant constructed in1882 – the Manhattan Pearl Street Station – was essentially a microgrid since a centralized grid had not yet been established. By 1886, Edison‘s firm had installed fifty-eight direct current (DC) microgrids. However, shortly thereafter, the evolution of the electric services industry evolved to a state-regu...

The hybrid AC-DC microgrid (HMG) architecture has the merits of both DC and AC coupled structures. Microgrids are subject to intermittence when the renewable sources are used. In the HMG, since power fluctuations occur on both subgrids due to varying load and unpredictable power generation from renewable sources, proper voltage and frequency regulation is the critical issue. This article propos...

One of the major paradigm shifts that will be predictably observed in energy mix is related to distribution networks. Until now, this type electrical grid was characterized by an AC transmission. However, a new concept emerging, as networks DC transmission are beginning considered promising solution due technological advances. In fact, we now witnessing proliferation equipment associated with r...

In this paper a repetitive control (RC) approach to improve current sharing between parallel-connected boost converters in DC microgrids is presented. The impact of changes in line impedance on current sharing is investigated. A repetitive controller is designed and connected in series with current controller of the boost converters to control the switching signals such that by regulating of th...

The development of AC distribution systems provides for the seamless integration low-voltage microgrids with distributed energy resources (DERs). This poses new challenges control normal, emergency, and post-emergency states microgrids, calling creation information communications technology infrastructure. Power converters/inverters that are used to integrate renewable DERs lack inertia. Along ...

The use of fuel cells in DC microgrids has been receiving a lot attention from researchers and industry since both technologies can deliver clean energy with little to no environmental impact. To effectively integrate microgrids, power converter that equate the cell’s voltage microgrid’s reference is required. Based on typical output voltages cells, buck-boost topologies are commonly used this ...

This article presents a Lagrange multiplier-based adaptive droop control to mitigate distribution power loss of parallel-connected distributed energy resource (DER) systems in dc microgrids. The comprising line and converter can be modeled as quadratic function the output currents DER systems, which optimized by tertiary-layer multiplier method obtain optimal current references for secondary-la...