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Normalized Least Mean Square Based Selective Current Harmonic Elimination in Voltage Source Inverters


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DOI: https://doi.org/10.15866/iremos.v7i3.978

Abstract


The voltage source inverters (VSIs) are dominating in adjustable speed drives applications and the lower order dominant harmonics are the main issues in them. Selective current harmonic elimination (SHE) is a widely researched and established as an alternative strategy to traditional pulse width modulation (PWM) techniques for power conversion systems. Majority of the existing SHE methods are voltage harmonic eliminations methods. This paper presents the adaptation of an adaptive filtering algorithm for the selective current harmonic elimination in a three phase ac voltage controller. Even though the current harmonic elimination is a direct method to improve the quality of any power conversion system, it demands a self-adaptive algorithm to manage with the time varying nature of load (current). The proposed Normalized Least Mean Squares (NLMS) algorithm based scheme eliminates the selected dominant harmonics in load current using only the knowledge of the frequencies to be eliminated. The algorithm is simulated using MATLAB/SIMULINK tool for a three-phase VSI to eliminate the fifth and seventh harmonics.  The system performance is analysed based on the simulation results considering total harmonic distortion (THD), magnitude of eliminated harmonics and frequency spectrum.
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Keywords


Selective Harmonic Elimination (SHE); Voltage Source Inverter (VSI); Normalized Least Mean Square (NLMS) Algorithm

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