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Microgrids are characterized as weak systems with poor power quality due to significant variations in frequency and/or voltage that can occur during sudden changes in load demand. This problem is exacerbated in cases where one of the power sources is tied to the microgrid through a grid-interactive inverter which is designed to trip when deviations in frequency and voltage exceed well-defined thresholds...
The recent amendment to the IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems (IEEE Std. 1547a-2014) is unleashing the application of advanced inverter functionalities to help mitigate voltage regulation problems commonly encountered in areas with high levels of PV penetration. This paper describes the experimental testing of some of the important autonomous functionalities...
Grid-tied photovoltaic inverter manufacturers rarely reveal the type of power electronic circuit topology and the type of technique used to track maximum power, control of power injected into the grid, and method used to avoid islanding operation. In this paper, an attempt is made to gain such information on a commercial 2.5 kW inverter by measuring the voltage and current waveforms under normal operation...
Numerous methods are known for grid-tie photovoltaic inverters to track the maximum power point and to avoid islanding operation, but the inverter manufacturers generally do not publish which of these methods they have implemented in their products. This paper reviews the most common maximum power point tracking and anti-islanding methods and points out to power quality signatures they may leave in...
The Nevada Shocker powered by nine 0.28 muF capacitors in a Marx Bank configuration yielding a maximum standup voltage and energy of 540 kV and 4.54 kJ respectively drives a 14.2 nF (in charging mode) Blumlein. The Blumlein with self-breaking water switch generates a 46 ns (theory) to 50 ns (experimental) pulse guided by a 7 Omega discharge transmission line to a parallel plate diode in a 10-6 Torr...
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