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Voltage sags and outages affect power quality (PQ) in terms of service continuity and disturbance propagation. Many methods have been adopted for locating the source of voltage sags in power systems; however, most of the methods can only identify the relative location of the sag source. This paper presents a new method to identify the exact voltage sag-source location in a power system based on the...
Voltage sag is considered as one of the most common power quality problems causing sensitive equipment to malfunction and many industrial process interruptions. Complains about the economic loss and equipment damage from industrial customers has stimulated the investigation on the voltage sag source location. As a result, many efforts have been made to know the location of voltage sags by utilizing...
This paper presents a novel method to placement of power quality monitors (PQMs) by using the multivariable regression (MVR) model, the Cp and Rp statistical indices. In this method initially, fault data in each bus is collected and then the correlation coefficient (CC) which show the relationship between buses during system disturbances are calculated to identify two or three buses with the highest...
Power quality has always been important for customers, but with increasing applications of electronic loads and controllers sensitive to the power quality, the subject has attracted renewed interest in recent times. Power quality encompasses several aspects. Voltage sags, transients, and momentary interruption of power together constitute 92% of the power quality problems encountered by typical industrial...
In this paper, a three-phase active power filter is presented to improve the power quality of a system which supplies a three-phase non-linear load. For this purpose, a three-phase voltage source inverter bridge with a DC bus capacitor is used as an active power filter. A new control strategy is proposed which is based on two popular strategies: synchronous d-q reference frame method & synchronous...
This paper presents a novel and easy to implement control strategy for unified power quality conditioner (UPQC). The control strategy of parallel active filter (PAF) is based on Fourier transform theory, while the control circuit of series active filter (SAF) is based on positive sequence detection theory. Operating of PAF using this method compensates for reactive power and current harmonics, while...
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