Symmetrical duty cycle control for FCSC converter for wave energy applications

Al-Mhana, Tahani; Zahawi, Bashar; Pickert, Volker

doi:10.1109/csndsp.2014.6923798

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…When the operating frequency is reduced, the controller increases the duty ratio of the switches (the capacitor is bypassed by the IGBTs for a longer period) and the effective capacitive reactance Xcc,eff is reduced [41] in line with the reduction in XLS maintaining the condition:…”

Section: Modes Of Operation and Control Methodsmentioning

confidence: 99%

Forced Commutated Controlled Series Capacitor Rectifier for More Electric Aircraft

Al-Mhana

Pickert

Atkinson

et al. 2019

IEEE Trans. Power Electron.

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Rising power demands in More Electrical Aircraft (MEA) put power converters for commercial airplanes under increasing pressure to fulfill current harmonic distortion regulations as specified, for example, in DO-160G. Today, the implementation of filters is seen as an effective tool for dealing with harmonics, however, their increased weight and volume is not welcomed in the aerospace industry. This paper proposes a circuit, named Forced Commutation Series Capacitor rectifier (FCSC-rectifier), which is able to maintain low individual harmonic current levels without the need for filter components. The FCSC-rectifier includes a variable capacitive line reactance that interacts in a controlled manner with the inductive line impedance. The result is that the converter input current is nearly purely sinusoidal with a power factor of almost unity. The FCSC-rectifier is to be used for stand-alone variable-voltage, variable-frequency generation systems (VFG) and can therefore power the Full Authority Digital Electronic Control System (FADEC) in an MEA. This paper shows that the FCSC-rectifier can maintain a high power factor and acceptable current harmonic levels without the use of filters, despite large voltage and frequency variations. A full description of the circuit modes of operation is presented in this paper together with simulation results showing circuit performance characteristics over a range of voltages and frequencies. Results are experimentally verified using a 1kW test circuit. Index Terms-Forced Commutated controlled Series Capacitor (FCSC), Full Authority Digital Electronic Control System (FADEC), More Electric Aircraft (MEA), current harmonics, power factor. I. INTRODUCTION he complexity of aircraft electrical loads has substantially increased in recent years with the advent of the More Electric Aircraft (MEA) [1-3]. The most safety critical system in any MEA is the FADEC (Full Authority Digital Electronic Control)system that continuously monitors and controls the ignition timing and fuel injection to the aircraft engine. FADEC control and designs have been reported in [4][5][6] with the focus being mainly on safety. Any failure within the FADEC leads to misfiring and loss of fuel injection [7-10] which would result in a catastrophic event, such as the Airbus A 400M crash in 2015 caused by FADEC failure [11]. One major area of concern is radiated and conducted EMI which could interact with the engine control

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Section: Modes Of Operation and Control Methodsmentioning

confidence: 99%

Forced Commutated Controlled Series Capacitor Rectifier for More Electric Aircraft

Al-Mhana

Pickert

Atkinson

et al. 2019

IEEE Trans. Power Electron.

Self Cite

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“…The main drawback of quorum-based protocols is the global parameter of m , that is, all nodes in the network have to operate in a symmetric duty-cycle setting. 19,20…”

Section: Related Workmentioning

confidence: 99%

“…The main drawback of quorum-based protocols is the global parameter of m, that is, all nodes in the network have to operate in a symmetric duty-cycle setting. 19,20 Deterministic protocols have been recently proposed to support asymmetric duty-cycle patterns and handle the global parameter problem, as these schemes allow sensor nodes to select one or multiple prime numbers to present its duty cycle. Disco 12 presents a new neighbor discovery method based on the Chinese Remainder Theorem.…”

Section: Related Workmentioning

confidence: 99%

Efficient group-based discovery for wireless sensor networks

Chen

Gao

et al. 2017

International Journal of Distributed Sensor Networks

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Due to the combination of constrained power, low duty cycle, and high mobility, neighbor discovery is one of the most challenging problems in wireless sensor networks. Existing discovery designs can be divided into two types: pairwisebased and group-based. The former schemes suffer from high discovery delay, while the latter ones accelerate the discovery process but incur too much energy overhead, far from practical. In this article, we propose a novel efficient group-based discovery method based on relative distance, which makes a delicate trade-off between discovery delay and energy consumption. Instead of directly referring to the wake-up schedules of a whole group of nodes, efficient groupbased discovery selectively recommends nodes that are most likely to be neighbors, in which the probability is calculated based on the nodes' relative distance. Moreover, the sequence of received signal strengths are employed to estimate the relative distance for avoiding the effect of the node distribution. Extensive simulations are conducted to verify the effectiveness of the design. The results indicate that efficient group-based discovery statistically achieves a good trade-off between energy cost and discovery latency. Efficient group-based discovery also shows one order of magnitude reduction in discovery delay with a maximum of 6.5% increase in energy consumption compared with typical discovery methods.

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