Virgilio Centeno

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Synchronized phasor measurements have become a mature technology with several international manufacturers offering commercial phasor measurement units (PMUs) which meet the prevailing industry standard for synchrophasors. With the occurrence of major blackouts in many power systems around the world, the value of data provided by PMUs has been recognized,(More)
(ABSTRACT) A single-phase grid connected transformerless photovoltaic (PV) inverter for residential application is presented. The inverter is derived from a boost cascaded with buck converter along with a line frequency unfolding circuit. Due to its novel operating modes, high efficiency can be achieved because there is only one switch operating at high(More)
Adaptive relaying proposes to provide protection functions that will adapt to changing power system conditions. The adaptive out-of-step relay presented recognizes power system changes and uses a modified system impedance matrix to change relay settings. An investigation of a Florida-Georgia 500 kV interconnection initially, used a simple two-machine mode(More)
This work reports the result of a comparative testing done on four Phasor Measurement Units ( PMU ) from different manufacturers. Phase shift and attenuation at fundamental frequency, performance under system balanced and unbalanced conditions and performance under system variable frequency are the issues addressed for this comparative assessment. The(More)
Power grid’s traditional security assessment approach – based on SCADA data and off-line studies conducted long in advance of real time operations – are becoming increasingly problematic for real time operations because they cannot fully anticipate all the conditions faced by operators. New technologies that rely on accurate, high-resolution, real-time(More)
This paper discusses measurements of the dynamic performance of electric power Phasor Measurement Units, PMUs, and their relation to the requirements of the IEEE Synchrophasor Standard C37.118-2005. In particular, it proposes a new method for monitoring the dynamic power signals that change in amplitude and frequency during the testing of PMUs. The new(More)
This paper investigates various forms of industrial time synchronization and attempts to apply them to Programmable Automation Controllers (PACs) for power system applications. PACs have been used in industry for many control applications, but advancements in synchronization technology has allowed for PACs to be used in high speed control and data(More)
The electrical distribution system in the United States is considered one of the most complicated machines in existence. Electrical phenomena in such a complex system can inflict serious self-harm. This requires damage prevention from protection schemes. Until recently, there was a safe gap between capacity to deliver power and the demand. Therefore, these(More)