Journal ArticleDOI
A Wide-Range Digital Power/Energy Meter for Systems with Nonsinusoidal Waveforms
TLDR
In this paper, a power and energy measurement system for electric vehicle drive systems is described, which is now in use gathering data on electric car drive systems and is designed to improve the measurement accuracy of systems with nonsinusoidal waveforms.Abstract:
A versatile, precision power/energy measurement system is described which is now in use gathering data on electric vehicle drive systems. It was designed to improve the measurement accuracy of systems with nonsinusoidal waveforms. At a continuous 1-MHz rate, it simultaneously digitizes the voltage and current for the input and output of a power converter under test. At the same 1-MHz rate the samples are multiplied together to get instantaneous power, and accumulated. Every half second the accumulations are used to calculate the average input and output voltage, current and power, total energy, amp-hours, and input-output efficiency. When used with coaxial shunts the operating range extends from milliwatts to megawatts. The efficiency measurements are accurate to within a few tenths of a percent for chopper frequencies up to 10 kHz.read more
Citations
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Journal ArticleDOI
A new algorithm for improving the accuracy of periodic signal analysis
Jiangtao Xi,Joe F. Chicharo +1 more
TL;DR: In this paper, the authors proposed a new approach which attempts to remedy the underlying problem by modifying the actual sampled sequence such that it becomes an ideal sample sequence which is synchronized with the signal subjected to sampling.
Journal ArticleDOI
A Wideband Sampling Wattmeter1
TL;DR: In this paper, the design and operation of a wideband sampling wattmeter capable of measuring distorted power signals with fundamental frequencies from 1 Hz to 10 kHz and harmonics up to 100 kHz is described.
Dissertation
Power Measurement Techniques for Nonsinusoidal Conditions. The Significance of Harmonics for the Measurement of Power and other AC quantities
TL;DR: In this article, a digital sampling Watt Meter (DSWM) is used to calibrate the amplitude and phase angle of individual harmonics of non-sinusoidal voltages and currents.
Journal ArticleDOI
High-accuracy sampling wattmeter
G.N. Stenbakken,A. Dolev +1 more
TL;DR: In this article, a high-accuracy sampling wattmeter was developed to investigate the feasibility of using waveform sampling techniques for making very accurate power measurements at frequencies from 50 Hz to 1000 Hz.
Journal ArticleDOI
Recursive random-sampling strategy for a digital wattmeter
TL;DR: It has been shown that the proposed sampling strategy does not limit the bandwidth of the instrument if an appropriate statistical distribution of the random increments is selected.
References
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Journal ArticleDOI
Digital Wattmeter Using a Sampling Method
TL;DR: In this paper, the average electric power can be measured by a system that samples voltages and currents at predetermined intervals, and the sampled signals are digitized and the result is computed by numerical integration.
Journal ArticleDOI
A wide-band wattmeter for the measurement and analysis of power dissipation in semiconductor switching devices
F.C. Schwarz,N.C. Voulgaris +1 more
TL;DR: In this article, a wattmeter with a wide-band (dc to 10 MHz) linear multiplier is used to observe the instantaneous product of the time-varying voltage and current in an arbitrary load.
Journal ArticleDOI
Measurement of Input Power of DC Motors Operated Using Rectifier Power Supplies and Choppers
TL;DR: In this article, the significance of measurements of the ac and dc components of input power of shunt and series-wound dc motors operated from rectifiers is presented and suggestions are given to check and improve the degree of accuracy of power measurements using conventional moving-coil wattmeters.
Journal ArticleDOI
Measurement Problems in Determining the Efficiency of Thyristor-Supplied Motor Drives
TL;DR: In this paper, the authors consider the problem of measuring power and losses of a dc motor supplied from a thyristor circuit, and propose some criteria for the necessary instrumentation.
Electric vehicle power train instrumentation - Some constraints and considerations
J. E. Triner,I. G. Hansen +1 more
TL;DR: In this article, the application of pulse modulation control (choppers) to dc motors creates unique instrumentation problems, in particular the high harmonic components contained in the current waveforms require frequency response accommodations not normally considered in dc instrumentation.