Power Quality Improvement using Shunt Passive Filter
Chamandeep Kaur
2015
unpublished
The electricity supply would, ideally, show a perfect sinusoidal voltage at every point of the power network. In reality, it is almost impossible to accomplish such desirable conditions. Voltage and current waveforms deviate massively from a sinusoidal. These waveform deviations are described by the use of waveform distortion and usually called harmonic distortion. Even if harmonic distortion is a quite old phenomenon it today presents one of the main concerns for public utilities, distribution
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... system operators as well as their end customers. Already in the first years of operation of power distribution networks, there were first disturbances.. The major concern at this time was the effect that harmonic distortion had for the electric machines itself. Another well-known issue was interference in the telephone lines. But in general it can be said that harmonic distortion in former times did not have the same dangerous potential like it has today. This paper presents the design and formulation of shunt passive filter to lower the harmonics and improve the power quality.. Key Words-Shunt Passive filter, Series Active filter, Hybrid filter I. Literature Background Enjeti et al., 1992), entitled "Analysis and design of an active power filter to cancel harmonic currents in low voltage electric power distribution systems", presents active power filter design considerations used for improving current quality in low voltage electric power distribution systems. Among various types of filters, shunt active filter is used for current harmonics removal and improves the power quality in electric power distribution system. (Hirofumi Akagi et al.,1998), entitled "The unified power quality conditioners: the integration of series-active and shunt-active filters", In this paper the main purpose of a UPQC is to compensate for voltage flicker/imbalance, reactive power, negative sequence current, and harmonics. In other words, the UPQC has the capability of improving power quality at the point of installation on power distribution systems or industrial power systems. This paper discusses the control strategy of the UPQC, with a focus on the flow of instantaneous active and reactive powers inside the UPQC. Singh, Bhim Al-Haddad et al., 1998), entitled "Harmonic elimination, reactive power compensation and load balancing in three-phase, four-wire electric distribution systems supplying non-linear loads" In this paper, a new control scheme of a three-phase active power filter (APF) is proposed to eliminate harmonics, to compensate reactive power and neutral currents and to remedy system unbalance, in a three-phase four-wire electric power distribution system, with unbalanced non-linear loads. The APF is realized using three single phase IGBT based PWM-VSI bridges with a common dc bus capacitor. (Bhim singh et al., 1999), entitled " A review of active filters for power quality improvements", presents in this paper presents a comprehensive review of active filter (AF) 21
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