Single-Phase Active Impedance Based Harmonic and Reactive Compensation
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ORIGINAL ARTICLE
Single‑Phase Active Impedance Based Harmonic and Reactive Compensation Bisrat Gezahegn Lemma1 · Minfu Liao1 · Xiongying Duan1 Received: 14 March 2019 / Revised: 2 November 2019 / Accepted: 18 September 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Single-phase active impedance hybrid active power filter is design to mitigate harmonic and reactive caused by the ever-increasing nonlinear loads. Nonlinear loads have been increased in residential and commercial as well as industrial sectors. Single-phase nonlinear loads contribute a harmonics and low power factor for the power systems. Single-phase active impedance hybrid active power filter was investigated to actively adjust multiple active short circuits. The dominant load current harmonics are compensated due to its multiple short effects over the single-tuned LC filter. At the same time, the conservative power theory (CPT) base reactive current extraction method was applied to actively regulate the reactive power. The amount of the fundamental filter reactive current obtained from CPT determines the reactive power compensation. The results were analyzed and presented in collaboration with the MATLAB/Simulink environment and TMS320F28335 board. The active impedance and CPT based control achieved a harmonic compensation (from 65.96% to 3.20%) and power factor correction from 0.85 to 0.95. Therefore, the active impedance hybrid active power filter can be taken as a good candidate for harmonic and reactive compensation with extending the conventional hybrid active power filter (HAPF) into multiple active tuned filters. It has potential practical benefit to avoid regular field retuning the passive filter in the industry. Moreover, it can also apply for PQ compensation using the existing PPF. Keywords Active power filters · Active impedance · Power quality · Total harmonic distortion · Conservative power theory
1 Introduction In low voltage distribution system single-phase voltage and/ or current source type harmonics have been increasing alarmingly [1, 2]. The single-phase power electronic appliances have gaining customer attraction for the information technology [3], electric vehicle technology [4], and household appliances due to its size, controllability, efficiency, etc. However, these nonlinear loads are sources of harmonics in the power system. Harmonics causes heating of transformer winding, communication interference, overloading of neutral lines, overrating of power apparatus and distribution transformer, * Minfu Liao [email protected] Bisrat Gezahegn Lemma [email protected] Xiongying Duan [email protected] 1
Institute of Electrical and Electronic, School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
etc. So far different harmonic mitigation techniques have been reported including passive power filters (PPF) [5], active power filter (APF) [6–8], hybrid active power filters (HAPF) [9, 10] and unified power quality conditioner (UPQC) [11]. The PPF has simple for implementation
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