Three-phase four-branch active filter for non-active power compensation under non-sinusoidal conditions

This paper presents a three-phase line-interactive uninterruptible power supply (UPS) system with active series-parallel power-line conditioning capabilities. Synchronous reference frame (SRF)-based controller is used for harmonic and reactive power compensation generated from any configuration of non-linear loads. Under normal line conditions the UPS system works with universal filtering capabilities, such as compensating the input currents and output voltages. Two three-phase pulsewidth modulation (PWM) converters, called series and parallel active filters, are used to perform the series and parallel active power-line compensation. The series active filter works as sinusoidal current source in phase with the input voltage, drawing from utility sinusoidal and balanced input currents with low total harmonic distortion (THD). The parallel active filter works as sinusoidal voltage source in phase with the input voltage, providing regulated and sinusoidal output voltages with low THD. The performance of the UPS system is evaluated in three-phase, four-wire systems. Experimental results are presented to confirm the theoretical studies.

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Three-phase four-wire shunt active power filter working simultaneously as energy conditioner

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-09-2016-0412 ◽

2017 ◽

Vol 36 (3) ◽

pp. 702-715 ◽

Cited By ~ 2

Author(s):

Andrzej Szromba

Keyword(s):

Control Method ◽

Reference Signal ◽

Active Power Filter ◽

Active Power ◽

Active Filter ◽

Supply Source ◽

Shunt Active Power Filter ◽

Content Type ◽

Power Filter ◽

Three Phase

Purpose The purpose of this study is to find a control method for three-phase four-wire shunt active power filters, which uses a load-equivalent conductance for obtaining a reference signal for compensating non-active current. Design/methodology/approach Changes of energy stored in an active filter’s reactance elements are monitored to find the active component of the load current. It is then used as a current reference to be realised as a supply source current. Computer simulation methods were used to verify the presented control method. Findings To calculate the reference signal for the active filter action, it is enough to measure the active filter’s DC-side capacitors’ voltages. It has been proved that P regulators are sufficient to realise compensating current and to stabilise active filter capacitors’ voltages. The supply source-neutral conductor current can be zeroed even for nonlinear and unbalanced load-generating DC-component in its neutral conductor. In addition, the active filter can buffer load-active power changes and act simultaneously as a local energy accumulator. Originality/value This paper provides an alternative approach to address the problem of the three-phase four-wire shunt active power filter control methods.

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Modelling, Simulation and Implementation of the Three-Phase Fuzzy Based Shunt Active Filter for Limiting the Total Harmonic Distortion

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.622.121 ◽

2014 ◽

Vol 622 ◽

pp. 121-126

Author(s):

Rahiman Zahira ◽

A. Peer Fathima ◽

Ranganath Muthu

Keyword(s):

Fuzzy Logic ◽

Harmonic Distortion ◽

Active Power Filter ◽

Active Power ◽

Active Filter ◽

Current Control ◽

Simple Method ◽

Shunt Active Filter ◽

Power Filter ◽

Three Phase

This paper presents the fuzzy logic controller for shunt active power filter used to compensate harmonic distortion in a three-phase system. The shunt active filter employs a simple method for estimating the reference compensation current. A fuzzy logic based current control strategy is used to regulate the filter current and hence ensure harmonic free supply current. Classic filters may not have satisfactory performance in fast varying conditions. However, an auto-tuned active power filter gives better results for harmonic minimization and power factor improvement. The proposed fuzzy based shunt active filter maintains the THD well within IEEE-519 standards. The validity of the presented approach in harmonic mitigation is verified by simulation results in MATLAB/ Simulink and hardware prototype.

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