Modeling of Failure Detector Based on Message Delay Prediction Mechanism

Liu, Bin; Yang, Shifei; Shi, Lei; Ding, Xiaoguang; Zhang, Qian

doi:10.4304/jsw.6.9.1821-1828

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…In anterior references, single phase phase-locked loop adopts hardware phase-locked method [3], tracking the phase position of power grid through zero-cross detection, but it is hard to use where harmonic pollution is heavy. At the moment, three-phase software phase-locked loop (SPLL) is widely spread and applied, and SPLL improves the importance of detecting magnitude to the same position as tracking phase position [4][5][6][7][8][9][10]. But affected by negative sequence and harmonic components, the phase-locked system needs select steady-state accuracy.…”

Section: Introduction Voltage Converter Based Facts (Flexible Altementioning

confidence: 99%

Three-phase Magnitude-phase Detection Based on T/4 Time-lapse Elimination Method

Zhang¹,

Jiang²,

Ding³

2014

JSW

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Affected by the negative sequence component and harmonic component of three-phase grid, the conventional three-phase software phase-locked loop (SPLL) circuits were unable to extract the magnitude-phase information of three-phase fundamental positive sequence component accurately, and the dynamic response speed was slow. In order to solve this problem, this paper introduces T/4 time-lapse elimination detection, a novel method of detecting three-phase magnitude-phase based on double d-q synchronous reference frame, functioning in decoupling positive and negative sequences of fundamental wave. When the voltage (or current) fundamental positive and negative sequence components are separated, the positive sequence component as well as the magnitude and phase position of negative sequence component from three-phase fundamental can be detected, so it is effective to restrain the impact on detection precision from negative sequence component. To verify the performance of this novel method, simulation experiments like transient response under normal grid condition, dynamic response under three-phase unbalance with harmonic pollution condition and dynamic response under phase jump condition are carried out. The simulation results verify that the proposed method overcomes the shortcoming of conventional three-phase phase-locked loop and tracks accurately the magnitudes and phases of the foundational positive-sequence voltage under harmonic pollution condition. And the results also verify that the proposed method can suppress odd harmonic propagation and has a higher detecting precision comparing with T/16 time-lapse elimination method. The improved T/4 time-lapse elimination detection can be wildly applied in three-phase power electronic devices.

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Section: Introduction Voltage Converter Based Facts (Flexible Altementioning

confidence: 99%

Three-phase Magnitude-phase Detection Based on T/4 Time-lapse Elimination Method

Zhang¹,

Jiang²,

Ding³

2014

JSW

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“…This portion forms a popularity of the dataset [12]. Therefore, how to efficiently migrate that popularity in medium reliability disk is critical to improve data reliability [32,34].…”

Section: Introductionmentioning

confidence: 99%

Using active data repair and migration technologies for RAID-based storage systems

Yang¹,

Liang²,

Tan³

et al. 2014

JCP

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This paper proposes a new RAID-based system using Active data Repair and Migration technologies called RARM, which detects the status of sector, then allocates reserved space in every disk and arranges to redirect the data in the non-repairable sectors to the reserved space. If we ensure the reliability and utilization of disk, RARM will copy data of the low reliability disk or the number of the bad sectors in the disk exceeding threshold to a new one; it will also copy and redirect popularity data of the medium reliability and high utilization disk to the reserved space in high reliability disk or a new one, these process, as we called data migration can avoid lengthy data reconstruction. It can adjust migration speed to reduce the impact on the front end performance dynamically and prioritize user requests when the system I/O workload is bursting. The overall results indicate that the RARM can improve performance and reliability of the system with little influence.

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“…So the designer must face the difficulties caused by dead-zone hysteresis. Several control schemes based on adaptive techniques have been proposed to compensate for dead-zone hysteresis in recent years, for example in [1][2][3][4][5][6]. The adaptive output feedback control scheme was proposed for a class of uncertain nonlinear systems with nonsymmetric dead-zone input.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, fault seems inevitable in practice control systems [6][7]. Such failures which may lead to instability or even catastrophic accidents are often uncertain in time, value and pattern.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Actuator Failure Compensation of Uncertain Nonlinear Systems with Dead-Zone Inputs

Cai¹,

Bao²,

Shen³

2013

JCP

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As is well known, dead-zone nonlinearity often exists in practical actuators and unknown actuator failures may occur during system operation. However, available results based on adaptive approaches to compensate unknown failures of such actuators are still very limited. In this paper, we address such a problem by considering a class of uncertain nonlinear systems with dead-zone hysteresis nonlinearities inputs. An adaptive control scheme is proposed by using backstepping technology to compensate the uncertainties caused by unknown failures of dead-zone actuators. The boundedness of all signals is established for the closed loop system and the desired output tracking performance is maintained for any unknown actuator failure.

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Modeling of Failure Detector Based on Message Delay Prediction Mechanism

Cited by 3 publications

References 9 publications

Three-phase Magnitude-phase Detection Based on T/4 Time-lapse Elimination Method

Three-phase Magnitude-phase Detection Based on T/4 Time-lapse Elimination Method

Using active data repair and migration technologies for RAID-based storage systems

Adaptive Actuator Failure Compensation of Uncertain Nonlinear Systems with Dead-Zone Inputs

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