Abstract
Current harmonics is one of the most significant power quality issues which has attracted tremendous research interest. Shunt active power filter (SAPF) is the best solution to minimize harmonic contamination, but its effectiveness is strictly dependent on how quickly and accurately its control algorithms can perform. This manuscript reviews various types of existing control algorithms which have been employed for controlling operation of SAPF. Harmonic extraction, DC-link capacitor voltage regulation, current control and synchronizer algorithms are examined and discussed. The most relevant techniques which have been applied for each control algorithm are described and contrasted in an organized manner to identify their respective strengths and weaknesses. It is found that the applied control algorithms differ in two conditions: (1) the condition where harmonic current distortion is treated by the SAPF in the presence of non-ideal source voltage; and (2) the condition where multilevel inverter is employed as the circuit topology of SAPF.
Highlights
Proliferation of nonlinear loads resulting from technological advancements in the power electronics field has attracted the attention of researchers, engineers and others who are concerned about harmonic contamination in power systems
Another review focusing on classifications of active power filters (APFs) was conducted by El-Habrouk et al [8] where the existing works on APFs were categorized according to the power rating of the operating power system, power circuit configuration, mitigation purposes, control algorithms employed, and reference current/voltage generation approaches
The control strategies applied in multilevel inverter-based shunt active power filter (SAPF) are similar to that applied in a SAPF which utilizes a standard two-level voltage source inverter (VSI) where they both operate based on three consecutive control processes starting from harmonic extraction/reference current generation followed by DC-link capacitor voltage regulation and end with current control
Summary
Proliferation of nonlinear loads resulting from technological advancements in the power electronics field has attracted the attention of researchers, engineers and others who are concerned about harmonic contamination in power systems. Another review focusing on classifications of APFs was conducted by El-Habrouk et al [8] where the existing works on APFs were categorized according to the power rating of the operating power system, power circuit configuration, mitigation purposes (such as current harmonics, power factor, and unbalances), control algorithms employed, and reference current/voltage generation approaches. SAPFs are developed for triple functions which include selective harmonic filtering, reactive power compensation and load balancing They are designed for three-phase systems (three-wire or four-wire) and are available in different current ratings to suit different applications in both low-voltage and medium-voltage networks. Control processes of SAPFs which include harmonic extraction, reference current generation, DC-link capacitor voltage regulation and current control are covered In this manuscript, the control algorithms are described for three-phase SAPFs as the more general situation.
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