Analysis of harmonics current minimization on power distribution system using voltage phase shifting concept
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Date
2007
Authors
Suriadi
Journal Title
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Volume Title
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Abstract
Non linear loads such as switch mode power supply and adjustable speed drive
in three phase three wires power distribution system can causes line current system
distorted. The non linear loads on three phases three wires power distribution system
were produced dominantly 5-th and 7-th order harmonic currents.
Increasing of harmonics current on electric power distribution system leads to
degradation of system performance. To reducing the harmonics current on power
distribution system should be minimized the 5-th and 7-th order harmonics current
components. The minimization process of harmonic current is accomplished by voltage
phase angle shifting on the two branches of non-linear load system, where the different
phase angle between both of branches should be300 . Because of 5-th order harmonic
current component is negative sequence and 7-th order harmonic current component is
positive sequence, therefore these harmonic current components on the line system
are opposite each other. Base on this concept, the phase shifter designing to harmonic
minimization is “Double Symmetric Zig-zag Autotransformer”.
The experimentation results for harmonic current minimization in three phase
three wires power distribution system using this voltage phase angle shifting concept. It
shows that the total current harmonic distortion on the line current system can be
reduced from 30.03 % become 10.2 %. This value is fulfill the IEEE standard 519-1992
recommended, where the IEEE standard 519-1992 allows the maximum limits for total
current harmonic distortion containing in power distribution system is bellow than 20 %.
The advantage of this concept is simply and practice, because it is only
required electromagnetic circuit and does not require sensor and control and the
electronic components. Beside this, The Double Symmetric Zig-zag Autotransformer
harmonic reducer has low rating kVA, smaller size, low losses and higher efficiency.
Description
Master
Keywords
Electric and electronic engineering , Power distribution system , Voltage phase shifting