Abstract
With direct current (DC) power generation from renewable sources, as well as the current relocation of loads from alternating current (AC) to DC, medium-voltage DC (MVDC) should fill gaps in the areas of distribution and transmission, thereby improving energy efficiency. The MVDC system is a platform that interconnects electric power generation renewables (solar, wind) with loads such as data centers, industrial facilities and electric vehicle (EV) charging stations (also using MVDC technology). DC–DC power converters are part of the rising technology for interconnecting future DC grids, providing good controllability, reliability and bi-directional power flow. The contribution of this work is a novel and efficient multi-port DC–DC converter topology having interconnections between two converters, three-level neutral point clamping (NPC) on the high-voltage (HV) side and two converters on the low-voltage (LV) side, providing two nominal low voltages of 400 V (constant) and 500 V (variable), respectively. The design of this new and effective control strategy on the LV side has taken into condition load disturbances, fluctuations and voltage dips. A double-closed-loop control topology is suggested, where an outside voltage control loop (in which the capacitance energies are analyzed as variable, and the inside current loop is decoupled without the precise value of boost inductance) is used. The simulation results show the effectiveness of the proposed control system. In the second part of this study, wide-bandgap SiC and Si devices are compared by using comprehensive mathematical modeling and LT-spice software. Improving power loss efficiency and overall cost comparisons are also discussed.
Highlights
Direct current (DC) network systems are being analyzed and explored for use in future transmission and distribution technology due to advancements and maturity in the power electronic devices
DC–DC high-power converters play a major role in the interconnection to Medium-voltage DC (MVDC) grids, which must be capable to deal with unidirectional or bi-directional power flows
The output from port (II) 500 V variable output is shown in Figure 13, which changes according to load variation
Summary
Direct current (DC) network systems are being analyzed and explored for use in future transmission and distribution technology due to advancements and maturity in the power electronic devices. Medium-voltage DC (MVDC) systems fill the gap in transmission and distribution areas, improving efficiency and energy delivery. MVDC grids would be the most flexible technique to collect renewable energy (e.g., solar, wind farms) and within industrial and urban area distribution networks. Compared to the medium-voltage alternating current (MVAC) system, the MVDC system shown in Figure 1 reduces cable weight, avoiding voltage dip problems at many points and parallels generators [1,2,3,4,5,6,7,8]. The first MVDC link between the UK and North Wales has recently been announced. The DC ANGLE project connects to the island of Anglesey by the Llanfair PG substation and to the North Wales mainland with Bangor operating at 27 kV DC along a
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