Abstract
This paper propounds the incorporation of a three-level inverter based Shunt Active Filter (SAF) in the Induction Heating (IH) system to eradicate the problems due to Electromagnetic Interference (EMI) & Radio Frequency Interference (RFI). The IH system generates a considerable amount of high-frequency harmonics because of myriad causes, the predominant one being the high-frequency switching in the resonant inverter. The former has an immanent propensity to flow towards the supply side and results in the enfeeblement of power quality. Moreover, in the present work, attention has been paid off to develop a proper control strategy of a three level inverter based SAF for EMI and RFI suppression. A new modeling approach of three-level inverter based SAF is proposed and the efficacy and viability of the proposed controllers for SAF in the IH system are validated via simulations in PSIM. A comparative analysis of THD in the input current waveform has been done to advocate the desideratum of SAF as an imperative part of the IH system. Results obtained by simulations show that the proposed approach is more effective than the reviewed approaches on compensating the harmonic currents and thus, the filtering action of SAF is able to achieve the THD of input current within the limit specified by the IEEE-519 standard. Doi: 10.28991/HIJ-2021-02-03-08 Full Text: PDF
Highlights
Technological demands in industries change rapidly, due to changes in energy requirement, the need for loss minimization and changes in the market
Simulation is performed on a high frequency induction heating system with and without the shunt active filter such that the effect of the Shunt APF on the Induction Heating Equipment (IHE) can be observed and compared
The input current waveform followed by its FFT analysis are shown in Figures 4(a) and 4(b) respectively
Summary
Technological demands in industries change rapidly, due to changes in energy requirement, the need for loss minimization and changes in the market. Existing technologies need upgradation very often to enhance the outcome of the production and ensure smooth operation of the appliances. One such evolving technology is the Induction Heating Equipment (IHE). Utilization of various kinds of power converters and non-linear loads used for this purpose in industries deteriorates the power quality, voltage and current waveforms. High-frequency switching operation of the inverter circuits produces a large number of current harmonics, which tend to move back towards the input of the circuit, deteriorate the input current waveform [1,2,3] and reduce system stability.
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