Power Grid Current Harmonics Mitigation Drawn on Low Voltage Rated Switching Devices with Effortless Control
; Anunciada, A.
International Journal of Electrical Power and Energy Systems Vol. 32, Nº 1, pp. 87 - 99, January, 2010.
ISSN (print): 0142-0615
Journal Impact Factor: 0,714 (in 2008)
Digital Object Identifier: 10.1016/j.ijepes.2009.06.008
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The great majority of the existing hybrid active power filter solutions is normally focused in 3~ systems and, in general, concentrates its domain of application in specific loads with deterministic behavior. Because common use grids do not exhibit these characteristics, it is mandatory to develop solutions for more generic scenarios, encouraging the use of less classical hybrid solutions. In fact, due to the widely use of switch mode converters in a great variety of consumer electronics, the problematic of mains current harmonic mitigation is no longer an exclusive matter of 3~ systems. The contribution of this paper is to present a shunt hybrid active power filter topology, initially conceived to work in 1~ domestic grids, able to operate the inverter at a voltage rate that can be lower than 10% of the mains voltage magnitude, even under nonspecific working conditions. In addition, the results shown in this paper demonstrate that this topology can, without lack of generality, be suitable to medium voltage (1~ or 3~) systems. A new control approach for the proposed topology is discussed in this paper. The control method exhibits an extremely simple architecture requiring single point current sensing only, with no need for any kind of reference. Its practical implementation can be fulfilled by using very few, common use, operational amplifiers. The principle of operation, design criteria, simulation predictions and experimental results are presented and discussed.