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A probabilistic method is proposed to evaluate voltage quality of grid-connected photovoltaic (PV) power systems. The random behavior of solar irradiation is described in statistical terms and the resulting voltage fluctuation probability distribution is then derived. Reactive power capabilities of the PV generators are then analyzed and their operation under constant power factor mode is examined...
Excessive levels of the harmonics are undesirable as they can cause additional heat losses in rotating machinery and therefore reduce the machinery useful lifetime. An approach to reduce the harmonics is proposed. The technique requires estimates of harmonic state in the given network by firstly classifying nodes of the network into one of four types. The condition for minimum measurement set is derived...
Using circuit analysis, it is shown that it is generally not possible to attribute precisely the power contributions from harmonic sources in loads. A harmonic power flow control scheme is proposed instead so as to reduce the harmonic heating effect in motor loads and thus increase the lifetime of the motors. The technique is based on the sensitivity measure of harmonic real power in the motors to...
A statistical approach is proposed in the assessment of voltage quality of network interconnected to a wind-farm. Random wind speed and uncertainty in the network status contribute toward the stochastic nature of the voltage quality. The analysis takes into consideration the reactive power capability of wind turbine generators (WTG). Judicious application of the reactive power control is shown to...
This paper presents an improved anti-islanding algorithm for utility interconnection of multiple distributed fuel cell powered generations (DFPGs). A cross-correlation method is proposed and implemented in conjunction with the anti-islanding algorithm developed in the previous work (C. Jeraputra and P.N. Enjeti, 2004). While the power control algorithm continuously perturbs (plusmn5%) the reactive...
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