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Rapid growth of non-linear loads in distribution systems has attracted power system engineers' attention from power quality point of view. Connection of the non-linear loads deteriorates power quality in the distribution system by introducing current harmonics. These current harmonics, when circulated in the electric network, interact with the system impedance and generate voltage harmonics. These...
A practical study of a hybrid series active power filter (HSAPF) for current harmonic compensation is presented in this paper. Part 1 emphasizes on the dimensioning and the designing of the passive components of the HSAPF namely the source impedance, passive filters (based on resonant LC circuits), and the current transformers. The needed electric coils were handily manufactured in the workshop using...
The paper proposes a solution for improving the power quality in a transportation system. The experimental determinations revealed a high level of harmonics and a high consumption of reactive power. The simulation using MATLAB/Simulink software was conceived and validated. A solution using passive filters is proposed and analyzed.
This paper discusses power quality improvement by using a combination of passive filters and DG units in power systems. The system simulation results are done for a system consisting of DG units and nonlinear loads. Passive filters are used to compensate reactive power and eliminate dominant harmonics however they have a limited band width and they are unable to compensate load unbalance and harmonics...
a new configuration is proposed to mitigate power quality problems in traction system. Proposed configuration is a combined system of single tuned passive filter and a thyristor controlled reactor. This configuration is cheaper and easier to implementation. It decreases power losses in supply system considerably through optimal compensation of reactive power. Also its control strategy is simple. A...
In this paper a new hybrid active filter is proposed that combines harmonic filtering and neutral current compensation. The main difference between proposed topology and conventional structures consists of the connection of neutral wire to positive terminal of DC link capacitor thus avoiding the need of split capacitor or forth leg for neutral current cancellation that reduces the manufacturing cost...
This paper presents the design of a new hybrid filter for quality improvement of power systems in unbalanced conditions. This filter includes a variable passive filter in parallel with an active filter. The passive part is designed with a varying inductance to reduce the rating of the active part. By using this proposed filter it is possible to compensate for the current harmonics and unbalanced loads...
With the deregulation of the electric power energy market, providing quality power has become an important concern of both power suppliers and customers. Efforts have been made to improve the power quality using passive filters, active power filters, hybrid filters and the new concept of custom power. This paper presents a comprehensive review of compensating custom power devices mainly DSTATCOM (distribution...
This paper describes the application of tuned power harmonic filters (PHFs) to a three phase shunt active power filter (APF) for the harmonic minimization created by a nonlinear load. This work is performed in order to show implementation of optimized harmonic power filters to a shunt active power filter can reduce total harmonic distortion (THD) without creating new system resonance. Steady state...
This paper deals with autotransformer-based multipulse ac--dc converters with reduced magnetics feeding vector controlled induction motor drives for improving the power quality at the point of common coupling. The proposed 12-pulse ac--dc converter-based harmonic mitigator consists of an autotransformer alongwith a passive shunt filter tuned for 11th harmonic frequency. This results in the elimination...
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