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The power factor (PF) levels are established by each country's national standards. In Brazil the lower power factor level allowed is 0.92. In order to monitor this quantity, the present paper uses Arduino to develop a PF metering system. It presents all the necessary theories concerning the calculus of the power factor itself, the programming logic applied to the data acquisition, and the details...
This paper presents a method for assessing causality in power quality under stationary conditions, resorting to an index tipically employed in graph theory, the centrality index. Subsequently, the method is illustrated by means of two real systems, allowing a comparison among the results obtained from other existing methods. A discussion regarding the results and its interpretation is presented as...
In this paper, experimental results obtained with two different types of measurement equipment are presented comparatively. One type of equipment is dedicated to power quality monitoring, while the second one is a phasor measurement unit with a supplementary module intended to be used to determine some power quality parameters. Experiments were designed as to emulate different power quality levels...
This paper presents the power-quality measurement results of Jang-Bin wind farm (WF) in Taiwan. This 46-MW wind farm with twenty-three 2-MW doubly-fed induction generators (DFIGs) is connected to Jang-Bin extra high-voltage substation of Taiwan Power Company (TPC) through six feeders and a step-up main transformer of three-phase, 23/161-kV, 60-MVA. The measured data were recorded during August 6–13,...
The determination of power quality disturbances has been studied in the last twenty years from different perspectives. Current decomposition provides a suitable approach to determine how disturbances propagate among circuits. The application of Fryze-Buchholz-Depenbrock - FBD power theory revealed useful results, such application has been called Method of Disturbances Interaction. In this paper a...
Many of modern distributed generation plants are based on photovoltaic cells using power electronic units for energy transmission into the electrical network. This increases the emission of high-frequency currents into the network and affects the operation of power line communication devices and energy meters. A real LV network in Germany was investigated by the authors with the purpose to estimate...
Proficiency tests of electrical drive systems for train put special requirements on the measurement system, especially when the electrical supply frequency is 16.7 Hz as it is in northern Europe. This paper describes such a measurement system and some special features.
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