Abstract
a line current harmonic reduction approach is proposed for multiple grid-tied converters, using decentralized interleaving PWM to attenuate switching current ripples at the point of common couplings (PCC). Firstly, the remote PCC voltage phase angle is estimated using only local measurement of a converter. With simple interpolations, the discretized low resolution PCC voltage angle information in the converter local processor is used as a synchronizer to adaptively adjust digital carrier phase angle in a high-resolution manner. Then, through the coupling between digital closed-loop control and modulation process, multiple parallel grid-tied converters can be easily controlled to generate interleaving PWMs, even under the cases of notable processor crystal oscillator frequency deviations or the grid voltage frequency is not fixed to nominal value.
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