Instantaneous power analysis and control of three-phase grid-connected vsc under unbalanced grid faults

Presently, with regard to the research in control of three-phase PWM-VSC under unbalanced dips, most of the literatures gain the current commands through the phase voltages based on the PQ power theory and the control flow is complicate too much. This paper, based on the instantaneous power analysis of VSC grid-side, calculate the current commands through line voltages and use the line voltages instead of the phase voltages in the feedforward. Not only the equation of current commands calculation is simplified, but also avoids the transformation of line voltages to phase voltages. In addition, this method adopts neither PLL nor coordinate transformation, and current sequential extraction is eliminated by adopting the PR controller in the current loop. In the end, the simulation results testify the efficiency of the proposed scheme in resisting grid voltage harmonics and nullifying fluctuation of dc-voltage.

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Determination of the pulse repetition interval (PRI) agility of an incoming radar emitter signal using instantaneous power analysis

AFRICON 2015 ◽

10.1109/afrcon.2015.7331860 ◽

2015 ◽

Author(s):

Ashraf A. Ahmad ◽

John B. Ayeni ◽

Suhail M. Kamal

Keyword(s):

Power Analysis ◽

Pulse Repetition ◽

Instantaneous Power ◽

Instantaneous Power Analysis ◽

Repetition Interval

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Analysis and Control of the Output Instantaneous Power for Three Phase PWM Boost Rectifier Under Unbalanced Supply Voltage Conditions

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics ◽

10.1109/iecon.2006.348092 ◽

2006 ◽

Cited By ~ 1

Author(s):

Xinhui Wu ◽

Sanjib K. Panda ◽

Jianxin Xu

Keyword(s):

Supply Voltage ◽

Instantaneous Power ◽

Three Phase ◽

Boost Rectifier ◽

And Control

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A Real Time Condition Monitoring System for Gears Operating under Variable Load Conditions

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v9.i2.pp493-501 ◽

2018 ◽

Vol 9 (2) ◽

pp. 493

Author(s):

Abdullah Alwadie

Keyword(s):

Power Analysis ◽

Detection Methods ◽

Variable Load ◽

Current Analysis ◽

Invasive Approach ◽

Stator Current ◽

Instantaneous Power ◽

Instantaneous Power Analysis ◽

Operating Points ◽

Load Conditions

Gears are important component of the rotational power transmission system and are largely used in variable load and speed applications. The faults on the gear generate excessive vibration which leads to breakdown of the machine. Sensor based methods could diagnose gear faults but proved to be expensive and have limited applications due to heavy cost and need of access of gear box for sensor installation. The motor stator current analysis has been reported to overcome the drawbacks of the sensor based fault detection methods. However, motor stator current analysis has a limited capability for reliable detection of small gear fault signatures typically for low load conditions. This paper presents an alternative non-invasive approach based on instantaneous power analysis of the motor to reliably diagnose gear faults for variable load applications. The theoretical and experimental results indicates that the instantaneous power analysis offers three fault related harmonics and amplitude variations on these harmonics could give the indication of health status of the gear.<strong> </strong> The superiority of the proposed instantaneous power analysis technique has been confirmed through experiments performed on three operating points of the motor. The comparison of the amplitude sensitivity of the motor stator current and instantaneous power at three operating points has been performed to validate the superiority of the proposed technique.

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