A digital power factor meter based on a ratiometric analogue-to-digital converter

Farhat, S; Cohen, E.

doi:10.1088/0022-3735/21/9/005

Cited by 3 publications

(3 citation statements)

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“…Many schems were proposed to measure the power factor. Many of these schemes took a cycle of an input power line frequency for the measurement [1][2][3][4][5][6][7][8][9], while attempts in [10][11][12][13] took only a half a cycle to record the power factor. An attempt to reduce the elapsed time for measurement to about a quarter a cycle was illustrated in [14].…”

Section: Introductionmentioning

confidence: 99%

A Shortest Data Window Algorithm for Detecting the Power Factor in presence of non-sinusoidal load current

Omran

Al-Khalid

Yaseen

2019

IJECE

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During recent years, nonlinear power electronic equipments introduce harmonic pollution on electric power systems. It makes the traditional power factor meter can not act accurately when it monitors unbalanced and harmonic loads. In this paper, a new algorithm for detecting the power factor in presence of non-sinusoidal load current is proposed. The proposed algorithm detects the true power factor exactly. By uses only two successive sampled data points of the voltage and the current for each displacement power factor value calculation and two sampled data points for each distortion power factor value calculation, the total/true power factor becomes easy to measure using these values directly. The proposed detector implemented using microcontroller as a main part and has been tested for single phase power system. The test results show that it can measure the true power factor of the loads quickly and accurately.

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Section: Introductionmentioning

confidence: 99%

A Shortest Data Window Algorithm for Detecting the Power Factor in presence of non-sinusoidal load current

Omran

Al-Khalid

Yaseen

2019

IJECE

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“…Many attempts were strived to measure the power factor of a power line frequency load [1][2][3][4][5][6][7][8][9]. All of these methods took at least one cycle of the power inputs to detect the power factor.…”

Section: Introductionmentioning

confidence: 99%

Ultra fast frequency independent instantaneous power factor detector

Omran¹,

Al-Khalid²,

Yaseen³

2019

IJPEDS

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Many schemes were attempted to lessenthe time taken for measuring the power factor of a linear load. This paper suggests taking advantage of a previous paper where only two samples of the voltage and current were adequate to have a very fast calculation method of the power factor. That scheme used a phase locked loop (PLL) as a frequency multiplier scheme to acquire two progressive samples of the voltage and current which are concurrent. The time elapsed for measurement was the reciprocal of the PLL sampling frequency; no further scheme was reported after that to claim a faster method. This paper gets use of that work to get two progressive samples of voltage and current separated by a short time. The scheme is frequency independent with an indication for lead lag. All the operations are executed by a PIC microcontroller rather than a computer with few support circuits. The output will be shown either in digital or analogue (DC) form. The percentage of error depends mainly on the resolution (number of bits) for both the ADC and DAC used.

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“…The first measurement is based on the H a l l effect principle [5], while the second one employs a ratiomebric analogue-todigital converter and an analogue switch to produce a signal proportional to cos$ [6]. The latter being integrated with the system The power factor (PF) of the load is given by the well known equation:…”

Section: Dieital Power Factor Measurementmentioning

confidence: 99%

An Intelligent Power, Energy and Maximum Demand Calibration System

Farhat

Singapore International Conference on Intelligent Control and Instrumentation [Proceedings 1992]

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Traditionally, power, energy and maximum demand meters are calibrated by direct comparison with a standard meter or with an accurately known equivalent power. In this paper, a new technique to calibrate these meters is introduced. A precision wattmeter based on a time-division principle with an accuracy of 0.05% is used. The concept is to connect the meter in a feedback loop where the output power of the system is maintained constant by adjusting the supply current. This provides a highly stabilised power source where the effects of current, voltage, phase angle variations and drifts are compensated.

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A digital power factor meter based on a ratiometric analogue-to-digital converter

Cited by 3 publications

References 1 publication

A Shortest Data Window Algorithm for Detecting the Power Factor in presence of non-sinusoidal load current

A Shortest Data Window Algorithm for Detecting the Power Factor in presence of non-sinusoidal load current

Ultra fast frequency independent instantaneous power factor detector

An Intelligent Power, Energy and Maximum Demand Calibration System

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