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A workflow for non-linear load parameter estimation using a power-hardware-in-the-loop experimental testbed

Published in:
2020 IEEE Applied Power Electronics Conf. and Expo., APEC, 15-19 March 2020.

Summary

Low-inertia microgrids may easily have a single load which can make up most of the total load, thereby greatly affecting stability and power quality. Instead of static load models, dynamic load models are presented here for constant current loads (CILs) and constant power loads (CPLs). Next, a flexible Power-Hardware-in-the-Loop (PHiL) testbed is employed for the experiments in this work. The PHiL testbed consists of a real-time computer working with a power amplifier in order to perturb its voltage and frequency. A connected load serves as the device under test (DUT). Using the captured experimental data as a reference, a parameter estimation algorithm is then implemented. The resulting parameter estimates are used to define simulation models. Both the CIL and CPL dynamic models are simulated to produce waveforms that closely resemble experimental waveforms. The algorithm, referred to as an enhanced monte carlo algorithm (EMCA), is explained in this work. Finally, the EMCA's resulting parameter estimates are presented.
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Summary

Low-inertia microgrids may easily have a single load which can make up most of the total load, thereby greatly affecting stability and power quality. Instead of static load models, dynamic load models are presented here for constant current loads (CILs) and constant power loads (CPLs). Next, a flexible Power-Hardware-in-the-Loop (PHiL)...

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Low cost phased array radar for applications in engineering education

Published in:
2013 IEEE Int. Symp. On Phased Array Systems and Technology, 15-18 October 2013.

Summary

Hands-on instruction in engineering education is beneficial to the development of a workforce that understands the complexity of building radar systems. Unfortunately, building phased array systems tends to be too costly to allow student access to the hardware necessary for developing these skills. This paper presents a low cost phased array based on a time-domain multiplexed, multiple-input, multiple-output (TDM-MIMO) approach that has been built for education. This array has been utilized in several free courses held at the Massachusetts Institute of Technology during the Independent Activity Period (IAP) between semesters. Students have built, tested, and taken home a number of these radars and continue to operate these on their own, either for recreation or as part of their undergraduate research activities.
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Summary

Hands-on instruction in engineering education is beneficial to the development of a workforce that understands the complexity of building radar systems. Unfortunately, building phased array systems tends to be too costly to allow student access to the hardware necessary for developing these skills. This paper presents a low cost phased...

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Comparisons of long-term Schumann resonance records in Europe and North America

Published in:
11th Int. Conf. on Atmos. Electr. 7-11 June 1999, pp. 705-708.

Summary

Two stations at a distance comparable with the wavelength in the Schumann resonance (SR) frequency range, one in Europe (Nagycenk, Hungary) and one in North America (West Greenwich, Rhode Island) have simultaneously monitored the natural vertical electric and horizontal magnetic field components in the frequency range of 3-25 Hz. This is a unique opportunity, as Schumann resonance stations are scarce and even fewer station have records with 5-6 year durations. The main purpose of this paper is to make comparisons in the SR time series measured simultaneously at the two field sites, thereby providing access to global behavior on the seasonal and interannual time scales. The comparative measurements described here point out distinct differences in the nature of convection in South America and in Africa, and reveal new aspects about the behavior of tropical continental convection on the ENS0 time scale.
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Summary

Two stations at a distance comparable with the wavelength in the Schumann resonance (SR) frequency range, one in Europe (Nagycenk, Hungary) and one in North America (West Greenwich, Rhode Island) have simultaneously monitored the natural vertical electric and horizontal magnetic field components in the frequency range of 3-25 Hz. This...

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