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The electrical power requirement of the aircraft has increased due to the secondary loads becoming electrical. This has led to the deployment of high energy density battery (Lithium-based batteries) in the MEA. In this paper, a high energy density battery (lithium-iron phosphate ‘LiFePO4’) is used as the battery energy storage system (BESS). The function of the BESS is to start the engine starter-generator...
The low voltage ride through (LVRT) capability is one of the critical requirements for distributed power generator connecting to power grid in many distribution codes, especially for the power grids with high penetration of distributed power generation. There has been much research conducted on LVRT capability enhancement for wind and solar power generators. This paper studies the applicability and...
Shoe-mounted inertial navigation systems, aka pedestrian dead reckoning or PDR sensors, are being preferred for pedestrian navigation because of the accuracy offered by them. Such shoe sensors are, for example, the obvious choice for real time location systems of first responders. The opensource platform OpenShoe has reported application of multiple IMUs in shoe-mounted PDR sensors to enhance noise...
Diesel generator is a prime mover based distributed energy resource (DER) popular in generation deficient regions. This paper deals with the analysis of critical requirements of diesel generator connection requirements for selected grid codes, namely German Grid code and Western Power Australia, as they characterized as imposing most stringent requirements for generator grid interconnection. Among...
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...
In order to achieve high performance field oriented control of induction motors, it is important that the rotor time constant be accurately known for slip speed and synchronous speed calculation. However the rotor time constant may vary during operation. In this paper, a novel rotor time constant identification method is presented. With the flux command disturbance, the current command produced by...
Concept of Virtual Synchronous Generator (VSG) to control inverters for emulating synchronous generator characteristics in grid integration of distributed energy resources (DER) is an emerging research area. Such distributed generators with diesel primeovers also have to comply to different electricity grid codes where Low Voltage Ride Through (LVRT) is a key requirement. VSG and LVRT are two independent...
This paper presents the benefits of interleaving three phase voltage source converters (VSCs) to improve the power density. The output harmonics are also analyzed in frequency domain, then design and optimization of coupled inductor and output filter are given. Verifications are carried out through electrical circiut and electromagnetic's FEM simualtions. Finally, the inductor weight are compared...
Low voltage ride-through (LVRT) is mandatory required in many recent revised grid codes and technical rules for distributed resources, including diesel engine generator, connected to the power systems. Research works for LVRT compliance and capability enhancement have been largely concentrated on to wind power generator. However, not much research works have been published about LVRT assessment of...
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 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...
This paper attempts an investigation on low voltage AC (LVAC) and low voltage DC (LVDC) architectures with supply voltage of 690 V AC, 60 Hz and 1000 V DC respectively for a Platform Supply Vessel (PSV ). Quantitative evaluation of performance of both the architectures is exercised for a PSV based on fuel consumption (FC), weight, volume, gas emissions and reliability. The PSV has four identical Diesel...
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...
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,...
In this paper, we present a long term experimental study performed on a foot mounted pedestrian navigation device, the Osmium MIMU22BTP, which is based on the OpenShoe platform. The aim of the study is to investigate the performance that can be expected in mass market applications. Accordingly, we investigate the error characteristics over a large number of tracking devices and their alternative mounting...
To drive SiC power module with high-speed switching, the stray inductance becomes a key factor in converter design. In this work, the stray inductances of module and peripheral circuits are investigated by simulation and measurement. With the loop stray inductance of 29.2 nH, the module is tested up to 800 V and 50 A with insignificant EMI issues of ringing and overshoot. And the dv/dt ratios at turn-off...
The grid compliance of generators has been largely focused on wind power generators in literatures. With the increase in installation of distributed power systems, the dynamic performance of governor controlled prime mover driven generators might be affected. This paper discusses the Low Voltage Ride Through (LVRT) compliance of a governor controlled generator connected to a ring structure transmission...
The implemented navigational algorithm of an inertial navigation system (INS), along with the hardware configuration, decides its tracking performance. Besides, operating conditions also influence its tracking performance. The aim of this study is to demonstrate robust performance of a multiple Inertial Measurement Units (IMUs) based foot-mounted INS, The Osmium MIMU22BTP, under varying operating...
This paper presents a design methodology for high power density converter (HPDC) operating as an AC aircraft bus provider, which presents a particular gravimetric power density challenge. High power rating 3-phase AC-DC converter design with weight minimization is elaborated. By considering sizing of major converter parts that contribute to total converter weight, optimal switching frequency to yield...
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