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Your search keyword '"Leyva, Ramon"' showing total 13 results
Start Over Author "Leyva, Ramon" Journal ieee transactions on power electronics
13 results on '"Leyva, Ramon"'

8. Negative-Sequence Current Capability in Low-Capacitance Cascaded H-Bridge Static Compensators With Optimal Third- Harmonic Circulating Current Injection

Author

Ramos, Ezequiel Rodriguez, Leyva, Ramon, Farivar, Glen G., Townsend, Christopher D., and Pou, Josep

Abstract

The cascaded H-bridge (CHB) low-capacitance static compensator (LC-StatCom) has a limited negative-sequence current injection capability compared to a conventional CHB StatCom, due to the comparatively larger oscillations on the capacitor voltages. Placing limits on the ability to provide negative-sequence current to the grid for a given capacitor size is required to prevent overmodulation. This article shows that these limits can be maximized by injecting an optimal third-harmonic circulating current. The effects of injecting the third-harmonic current on the capacitor voltages, both in balanced and unbalanced grid voltage conditions, are analyzed. Specifically, the procedure allows the knowledge of the potential capability of the LC-StatCom when injecting negative-sequence currents. The procedure is based on a linear programming approach. Although the procedure is applicable to any CHB StatCom, regardless of the submodule capacitor size, it is particularly important in LC-StatComs. To corroborate the proposed analysis, simulation and experimental results under balanced and unbalanced grid voltage conditions are presented.

Published
2023
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10. Paralleling dc-dc switching converters by means of power gyrators

Author

Cid-Pastor, Angel, Martinez-Salamero, Luis, Alonso, Corinne, Leyva, Ramon, and Singer, Sigmund

Subjects
Electric current converters -- Design and construction, Electric current regulators -- Usage, Voltage regulators -- Usage, Power electronics -- Research, Electric current converter, Business, Electronics, Electronics and electrical industries
Abstract

In this paper, the problem of paralleling dc-dc switching converters is solved by means of power gyrators. The key element of the parallel connection is a buck converter with input filter acting as a power gyrator of type G with controlled output current, i.e., with its dc output current being proportional to its dc input voltage, electromagnetic interference minimization, current distribution among converters, stability, and voltage regulation are ensured by this approach. It is shown that a voltage regulator based on the parallel operation of power gyrators with democratic current sharing is always stable regardless of the number of connected modules. Experimental results of a dc-dc voltage regulator based on the parallel connection of three power gyrators with democratic current sharing are in perfect agreement with the theoretical predictions. Index Terms--Converter paralleling, gyrators, stability and voltage regulation.

Published
2007

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