Research on Control Method of Grid-Connected Inverter Suppressing Grid-Voltage Background Harmonics

Abstract:

The traditional LCL-filter third-order system grid-connected inverter may cause the resonance phenomenon without damping. Also, it will be affected by the distorted grid-voltage background harmonics. In order to overcome these problems, based on the passive damping method, a new control strategy is proposed. The paper analyses the current waveform performance of grid-connected inverter in the condition of grid-voltage background harmonics, derives the feed-forward function for grid-connected inverter. The disadvantages of passive damping could be well solved by damping resistor virtualization of the original system, which realized the active damping suppression of resonance. Simulation results based on the Heric single-phase transformerless grid-connected inverter verify the correctness of the 2éQ: theoretical analysis"theoretical analysis.

• Periodical: Advanced Materials Research (Volume 787)
• Pages: 861-866
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.787.861
• Online since: September 2013
• Authors: Chun Long Zhang
• Keywords: Grid-Connected Inverter, LCL-Filter, Passive Damping, Voltage Background Harmonics

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