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The high power density converter is required due to the strict demands of volume and weight in more electric aircraft, which makes SiC extremely attractive for this application. In this work, a prototype of 50 kW SiC high power density converter with the topology of two-level three-phase voltage source inverter is demonstrated. A gate assisted circuit is further introduced to reduce the switching...
Cooling system becomes a serious concern due to weight and volume contribution of power electronics system in aerospace sector. This research investigates the contribution of cooling system to the total weight of power electronics converter when liquid metal cooling is applied. In addition, it is compared with the traditional working fluid (water). It is concluded that cooling system could be much...
Solid State Power Controller (SSPC) is gaining popularity, replacing mechanical switches and circuit breakers, in niche markets like electrical power distribution systems of the more electric aircraft. Significant amount of research is being conducted to develop high power SSPCs to cater the dynamic, distributed load management. The 28V SSPCs are widely used for protection and control of the secondary...
Integration of electric vehicles (EVs) into existing power system can be carried out smoothly and efficiently using coordinated/smart charging. Time based coordination and power based coordination are the two strategies available for coordinated charging methods. Both the charging strategies operate the EV chargers at different operating power and hence the overall all charging efficiency differ from...
The high power density converter is required due to the strict demands of volume and weight in more electric aircraft, which makes SiC extremely attractive for this application. In this work, a prototype of 50 kW SiC high power density converter with the topology of two-level three-phase voltage source inverter is demonstrated. This converter is driven at high switching speed based on the optimization...
This paper demonstrates a 60kHz 50kW/400Hz grid facing three-phase power converter using commercially off-the-shelf Silicon Carbide (SiC) module. The power converter is designed to achieve high gravimetric density for possible application in future aircraft. In order to achieve high power density, the power converter is operated with high switching frequency to minimize its LCL filter size that connects...
This paper presents power loss and thermal analysis of SiC power devices in a 50 kW 3-phase high power density converter during operation. The presented loss and temperature estimations include average analysis and transient analysis by using electro-thermal simulations. For this purpose, thermal impedance network of the SiC power module and cold plate prototype are extracted. Transient analysis shows...
The power converter for more electric engine in aircraft requires high power density, which makes SiC extremely attractive for this application. In this work, a 50 kW SiC high power density converter with the topology of three-phase two-level voltage source inverter is developed. Meanwhile, an accurate mathematical model for the power loss and efficiency calculation is proposed, which is based on...
The increasing demand for high power density requires power converter to operate in high switching frequency. SiC power module is regarded as one of the most promising candidates for high-frequency applications due to the superior switching speed and low switching loss. The conventional strategy to optimize switching loss is normally achieved by repetitive double pulse tests, which is time-consuming...
The high switching frequency (> 20 kHz) of SiC MOSFET module makes it as an attractive alternative of Si IGBT module for high power density applications. Since SiC MOSFET and Si IGBT have the similar MOS-gated structure, it is normally regarded that the gate driver of SiC MOSFET can directly inherit from that of Si IGBT. However, considering the different device physics properties, some special...
The rise of DC nanogrids distribution system allows for lower component count, higher overall system efficiency and an ease of integration with renewable energy sources and DC battery storages. In a built environment, the retrofitting to extra-low voltage direct current (ELVDC) for distribution seems promising for residential loads. However, there exists an inherent line to ground fault for line to...
This paper presents the extraction of common mode (CM) and differential mode (DM) inductances of a common mode choke (CMC) using 3D finite element method (FEM). For optimal performance of the CMC, the effects of CM and DM currents on the magnetic core saturation are investigated. As the parasitic capacitance of a CMC is a critical parameter that affects its high frequency performance, the parasitic...
In power transistor models, it is very important that device capacitances are modelled accurately so that switching losses, EMI filter requirements and gate timing requirements of the converter can be accurately determined. In this paper, a modelling technique utilizing modified sigmoid functions to describe the device capacitances is applied on a GaN HEMT and a silicon MOSFET to develop their corresponding...
The trend towards SiC-based high power density converter requires to drive SiC MOSFET with high-speed switching. However, it tends to aggravate dv/dt effect due to the impact of parasitic parameters, resulting in shoot-through and high device stress in the half bridge configuration. In this work, a novel gate assisted circuit is proposed to eliminate shoot-through issue without compromise on switching...
The reactive power in power converter with inductive load (motor drive e.g.) requires a current commutation path for the freewheeling current. Due to the high voltage drop of body diode of SiC MOSFET, a SiC Schottky diode is normally recommended as the anti-parallel freewheeling diode for SiC MOSFET to suppress the conduction of body diode. However, since the MOSFET can work as synchronous rectifier,...
This paper involves development efforts that are necessary for the realization of highly versatile interface model for microgrid system monitoring. In this paper, we first discuss the user needs for micro-grid systems monitoring. We then introduce a query framework for system monitoring. Thus, an effort will be made to further articulate the user needs toward user requirements of an adequate user...
In this paper, it is shown that 2.4 GHz WiFi band is the most suitable source for radio frequency (RF) energy harvesting (EH) indoors. By studying the RF EH work done previously, a trend of increasing the amount of energy harvested by using DC combining antenna array, smaller antenna elements, and shorter elements separation is observed. To increase the area utilization of such arrays, impedance transformers...
The paper examines the use of energy storage system to smoothen the output power from wind farms, and to make dispatch planning from the wind power generators possible. Firstly wind power is segregated into components through the use of filters designed from the application of empirical mode decomposition technique. Buffering of the high- and mid-frequency components of the wind power is then effected...
With the technology roadmap of LED moving towards high efficacy low power LEDs, the current AC distribution system suffers from system inefficiency. An energy efficient ELVDC power distribution for LED lighting system is proposed. The different design considerations affecting the inherent higher voltage drop at ELVDC level are discussed in this paper. Simulations are presented in the context of a...
In a DC distribution system, the reliability of the interfacing converter is crucial. The ability to detect the fault occurrence in a fast and accurate manner for fault mitigation is one of the criteria for fault diagnosis of a distribution system in a built environment. In this paper, an interfacing cascaded boost chopper rectifier is used as a case study for fault diagnosis. Wavelet transform of...
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