Abstract
The flow of a large current in the neutral conductor of a transmission system is one of the major problems caused by harmonic pollution. This current can assume excessive values and even exceed the current flowing in the phases which can be extremely dangerous both for the equipment and the safety of the personnel. Currently, the parallel or shunt active filter (SAF) or parallel active filter is considered as the most effective solution to mitigate harmonic pollution and restore a sinusoidal current waveform in electrical distribution networks. The SAF can be used to compensate for harmonic currents, as well as that of the reactive power. This paper proposes a SAF circuit based on a four-arm inverter topology. The designed SAF is shown to lead to better harmonic compensation with a reduced THD (Total Harmonic Distortion) level in the presence of nonlinear and unbalanced loads in the network. The other goal of this study is to eliminate the neutral current caused by the unbalance in the polluting loads connected to the distribution network, achieve a near-sinusoidal current waveform and protect the electric network equipment.
Highlights
IntroductionHarmonics are a major power quality issue and affect most industries
Nowadays, harmonics are a major power quality issue and affect most industries
These power electronic devices are widely used in variable-speed drives, controlled and uncontrolled rectifiers, uninterruptible power supplies (UPS), computers and power system integration of renewable energy sources
Summary
Harmonics are a major power quality issue and affect most industries They are mainly due to the widespread utilisation of non-linear loads such as electrical and electronic devices and equipment Harmonic pollution generate serious consequences for the electrical system which leads to tsignificant economic losses. The significant advances made in the field of power electronics has led to the development of new semiconductor devices with low-cost, fast switching ability and high-power applications [1,2]. These power electronic devices are widely used in variable-speed drives, controlled and uncontrolled rectifiers, uninterruptible power supplies (UPS), computers and power system integration of renewable energy sources. Due to their nonlinear characteristics, they contribute significant power quality degradation
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