The upward trend for the use of electrical power on state-of-the-art aircraft is resulting in significant change to design system architectures and protection systems these platforms. There a pull from aerospace industry integrate with aircraft's structural materials form an embedded system, reducing need bulky cable harnesses. This directly impacts fault response ground faults ultimately development appropriate systems. Such include composites such as carbon fiber reinforced polymer (CFRP)....

Electrical propulsion has been identified as a key enabler of greener, quieter, and more efficient aircraft. However, electrical aircraft (EPA) will need to demonstrate level safety fault management (FM) at least equal current This rely heavily on the capability design FM system. Given functional limitations lack technologies suitable for future EPA application, strategic development devices is required. While there are variety roadmaps concepts components, necessary solutions targeted...

A tool for component sizing MMCs has been developed and tested through simulations in PLECS. The steady-state behaviour under grid frequency deviations — interesting offshore wind farm connections analysed, providing insights MMC characteristics further testing the proposed tool.

Many leading wind turbine manufacturers are pushing forward in variable-speed turbines, often exceeding 5 MW. Therefore, novel designs and concepts for optimal high power turbines appeared. One of the most promising is voltage (10-35 kV) transformer-less topology. High design enables low losses elimination bulky step-up transformer from system. However, new challenges appear such topology, which have to be properly identified successfully overcome. This paper presents possible concept...

Bidirectional power converters are considered to be key elements in interfacing the low voltage dc microgrid with an ac grid.However date there has been no clear procedure determine maximum permissible fault isolation periods of converter components against faults.To tackle this problem, paper presents electro-thermal analysis main a converter: inductors, capacitors and semiconductors.In doing this, provides methodology for quantifying protection requirements future microgrids.The is...

3L-NPC inverters are more popular due to their superior performance compared with two level inverters. One of the most optimal applications for multilevel inverter is Adjustable Speed Drives (ASD). The industry reported numerous ASD failures high frequency PWM. Those consist in insulation breakdown and bearing failures. By use this type converters, both Electromagnetic Interference (EMI) harmonic distortions improved. This paper proposes modulation strategies Three Level Neutral Point...

The increasing electrical demand in commercial and military aircraft justifies a growing need for higher voltage DC primary distribution systems.A system offers reduced power losses space savings, which is of major importance manufacturers.At present, challenges associated with systems include reliable fast acting short circuit protection.Solid State Contactors (SSC) have gained wide acceptance traditional 28 VDC secondary fault interruption.However, the operation at operating voltages...

A novel adaptive control function is presented as an improvement to the classic volts per hertz (V/f) technique where high torque oscillations occur during rapid changes of rotating speed. The proposed feature improved controller limits by injecting a pulse and imposing pre-determined bands on voltage reference waveform whenever scheduled change in speed occurs. This has been integrated with closed-loop V/f scheme, subsequently modelled evaluated numerically using transient simulation...

Since dc distribution minimizes the number of power conversion stages, it lowers overall cost, losses, and weight a system. Critical systems use IT grounding because is tolerant to first-fault. Hence, this an attractive option for hybrid electric aircraft (HEA), which combines gas engines with motors driven by electronic converters. This letter proposes accurate implementation procedure first-fault detection grounding. The ac component injection along sliding discrete Fourier transform...

The upwards trend for the use of electrical power on state art more-electric aircraft (MEA) has resulted in a significant changes to system (EPS) these platforms due increased DC, higher voltage and levels, decentralized architectures. A dual is increasing carbon fibre reinforced polymer (CFRP) structures, superior mechanical properties CFRP compared metallic structures. However, poorer conductivity results structure no longer being fully integrated with system. There need integrate two...

There is a well-recognised need for robust simulation tools to support the design and evaluation of future More-Electric Engine Aircraft (MEE/MEA) concepts.Design options these systems are increasingly complex, normally include multiple power electronics converter topologies machine drive units.In order identify most promising set system configurations, large number technology variants be rapidly evaluated.This paper will describe method MEE/MEA with use newly developed transient modeling,...

In recent years, the More-Electric Aircraft (MEA) concept has undergone significant development and refinement, striving towards attainment of reductions in noise CO2 emissions, increased power transmission efficiency improved reliability under a range flight scenarios.The Engine (MEE) is increasingly being seen as key complementary system to MEA.With this concept, conventional engine auxiliary systems (i.e.fuel pumps, oil actuators) will be replaced by electrically-driven equivalents,...

Following work examines current and voltage distribution during ground faults in cables of the transformer-less feeder system consisting interconnected source converters. Analysis is performed with regard to converter block operation, fault-ride-through requirements, cable design different grounding schemes. show, that systems effective grounded generator's neutral general provide best across cables.