Energy management strategy for medium-voltage Isolated microgrid

Survey and Benchmark of Benefits of High Voltage SiC Applications in Medium Voltage Power Distribution Grids

“…Through solving equations (6-10), (6)(7)(8)(9)(10)(11), and (6-12), the overvoltage and overcurrent of the converter can be obtained. However, it is difficult to do that, so simulation could be a good method to do the estimation.…”

“…From (6)(7)(8)(9)(10)(11)(12)(13), the converter neutral point potential, V NG , makes a substantial difference for the components' potential during the lightning transient. V NG is mainly determined by the ratio of the neutralto-ground impedance, L ng , to the filter inductor impedance, L filter .…”

“…The design goal here is to get the inductor size as small as possible, so the two choices are compared. The AP value is commonly used in the inductor design and the core selection, and it can be calculated as 𝐴𝑃 = 𝐿 • 𝐼 𝑟𝑚𝑠 • 𝐼 𝑖𝑛𝑟𝑢𝑠ℎ 𝐾 𝑢 • 𝐵 𝑚𝑎𝑥 • 𝐽 𝑚𝑎𝑥 (6)(7)(8)(9)(10)(11)(12)(13)(14) where I rms is the current RMS value, I inrush is the inductor inrush current, K u is the window area utilization factor, B max is the maximum flux density, and J max is the maximum wire current density. The inrush current in different grid conditions can all be estimated as 𝐼 𝑖𝑛𝑟𝑢𝑠ℎ = 𝐼 𝑝ℎ + ∆𝑣 𝑝ℎ 𝐿 ∆𝑡 (6)(7)(8)(9)(10)(11)(12)(13)(14)(15) where I ph is the phase current before the abnormal condition, Δv ph is the phase voltage change, which induced the inrush current, and Δt is the rising period of the inrush current.…”

“…Following this trend, the microgrids interconnected to the medium voltage (MV) distribution networks have been studied in detail recently for better integration of MW-scale bulky renewable power resources. The research efforts have been focused on power management [10] [11], system stability [12], control structure [13], and protection schemes [14]. Moreover, the asynchronous microgrid through a power conditioning system (PCS) has been proposed and promoted recently [15].…”

Optimal planning of hybrid renewable energy systems using HOMER: A review

“…To achieve the objective of this degree project, the information collected must be organized and selected not only so that the primary result (See figure 24) technically meets an energy demand, but also so that it leads to compliance with economic viability standards, implementation and maintenance, environmental care and social sustainability [104].…”