The use of power converters is increasing due to their utility for varions forms of energ}' and ease of control. However, they absorb non-sinusoidal currents and thereby introduce currents and voltages harmonies in electrical distribution network. The présence of harmonies in the SNStem results in several effects including increased heating losses in transformers, motors and Unes, low power factor, torque pulsation in motors and poor utilization of distribution wiring and plant. Electric distributors must deliver electric energy to the electricit)' users at acceptable levels of service quality, which respect the limits imposed by IEEE 519-1992 and lEC 61000.3-2 /4.
Several solutions are used, among them the active filtering, which is the most used, but there are spécifie disadvantages, including its cost and its high design for industrial applications. Traditionally, passive filters hâve been used to eliminate spécifie harmonies and improve the power factor. but their bulky size, limited compensation ability, and susceptibility to résonance with the source impédance constitute a major drawback. These problems can be limited simultaneously by using the shunt hybrid filter and the hybrid passive filter. The aim of this thesis is to propose some solutions to improve the power quality: In this context, a new hybrid passive filter configuration hâve been proposed to compensate load harmonies, correct power factor. eliminate the chances of series and parallel resonance and eliminate large variation of power factor and terminal voltage with varying loads under stiff and distorted source conditions.
The second solution involves modeling of the three-phase shunt hybrid filter, which helps to apply the advanced control technique in order to improve the static and dynamic performances. Finally, an economical solution for a new topology of three-phase séries hybrid filter is proposed in order to handle the voltage dips, the sags, the voltage harmonies, the currents harmonie and the power factor.
| Date | 14 Sept 2010 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Kamal Al-Haddad (Supervisor) & Salem Rahmani (Co-supervisor) |
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Hamadi, A. (Author),
Al-Haddad (Supervisor) & Rahmani (Co-supervisor),
14 Sept 2010Student thesis: Doctoral thesis › Doctorate in Engineering: Engineering