研究目的
To describe a synchronized current-comparator-based power bridge for calibrating analog merging units at power frequencies of 60 Hz and 50 Hz.
研究成果
The developed current-comparator-based system provides traceable calibrations of analog merging units with preliminary expanded measurement uncertainties (k=2) better than 30 μA/A for magnitude and 60 μrad for phase at 50/60 Hz.
研究不足
The system's measurement uncertainties are estimated to be better than 30 μA/A for magnitude and 60 μrad for phase at 50/60 Hz. The phase calibration uncertainty is impacted by the digital sampler's alignment accuracy.
1：Experimental Design and Method Selection:
The system uses a current-comparator-based power bridge synchronized to a GPS reference for calibration.
2：Sample Selection and Data Sources:
Analog merging units with analog inputs and digital outputs are calibrated.
3：List of Experimental Equipment and Materials:
Includes a GPS receiver, phase generator, ratio transformers, voltage amplifier, thermal voltage converter, digital sampler, transconductance amplifier, current comparator, and a computer for data analysis.
4：Experimental Procedures and Operational Workflow:
The system generates precise voltage and current signals, aligns them with a 1 PPS signal, and compares them using a current comparator to calibrate the merging units.
5：Data Analysis Methods:
Sampled values from the merging unit are captured and analyzed to determine measurement errors.
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GPS receiver
Provides a 10 MHz reference and 1 pulse-per-second (1 PPS) signal for synchronization.
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Phase generator
PG
Generates two orthogonal sinusoidal signals (0o and 90o) at the operating power frequency of 50 Hz or 60 Hz.
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Ratio transformer
T1, T2, T3
Scales the input signals to provide precise voltage and current inputs for calibration.
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Voltage amplifier
A
Produces an operating AC voltage, VAC, at its output.
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Thermal voltage converter
TVC
Used for AC-DC comparison to establish the rms value of the voltage VAC against a DC voltage reference.
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Digital sampler
DS
Samples the voltage VAC using the 1 PPS as a start trigger for phase alignment.
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Transconductance amplifier
T
Produces an operating current, IAC, with a given amplitude and phase angle with respect to the voltage VAC.
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Current comparator
CC
Compares the current IAC to the weighted sum of a reference in-phase current Ir and a reference quadrature current Ic.
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Detection and feedback module
DFB
Observes the balance of the current comparator and provides feedback to reduce imbalance.
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Phase sensitive detector
PSD
Used in conjunction with the DFB to detect and correct phase imbalances.
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