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A Real-Time PWM-CSI Design and Implementation for an Improved Residential Grid Harmonics Spectral


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DOI: https://doi.org/10.15866/iree.v18i2.22638

Abstract


The spread of power electronics-based non-linear loads increase the harmonics distortion level in power systems. Real-time interactive systems are considered the most promising solution to several grid power quality problems. The practical design considerations are the aim of this study. A current sensor in addition to controller circuits is used for instantaneous current measurement. This measured current is including both the fundamental and the harmonics according to the connected loads. A simple mathematical algorithm for estimating the fundamentals is implemented using the microcontroller. By subtracting the fundamental from the measured current one can extract the whole current harmonic waveforms. This current waveform is used as a modulated signal for Pulse Width Modulation-Current Source Inverter (PWM-CSI) connected to the grid. The current source inverter is the most effective technique to inject the same harmonics shifted with 180 degrees for higher harmonics reduction. The PWM-CSI switching frequency will be determined according to the desired harmonic orders to be eliminated. In this work, the 1 kHz is the switching frequency for eliminating up to about the 20th harmonic order. The laboratory experimental results are satisfactory and confirm these obtained from the analytical and the simulation.
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Keywords


Current Source Inverter (CSI); Harmonics; Non-Linear Loads; Power Quality; Pulse Width Modulation

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References


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