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DC Offset Error Compensation Algorithm for PR Current Control of a Single-Phase Grid-Tied Inverter

Author

Listed:
  • Jae Suk Lee

    (Department of Electrical Engineering, Chonbuk National University, Jeollabuk-do 54896, Korea)

  • Seon-Hwan Hwang

    (Department of Electrical Engineering, Kyungnam University, Changwon 51767, Korea)

Abstract

In a single-phase grid-tied inverter, the direct current (DC) offset error included in the measured grid side phase current has various causes, such as a non-ideal current sensor, unbalanced power supply of an operational amplifier, and nonlinear features of analog components in interface circuits, etc. If the DC offset error is included in the measured current, it causes the secondary harmonic of fundamental frequency and the DC component in grid phase current which result in degradation of inverter performance. In this paper, a theoretical detection method of the secondary harmonic of the fundamental frequency and a DC component in grid phase current for a proportional-resonant (PR) current control system is introduced. Based on the detection method, an algorithm for compensating DC offset error is also presented for single-phase grid-tied inverters. Simulation results and experimental verification of the DC offset error compensation algorithm are shown in this paper.

Suggested Citation

  • Jae Suk Lee & Seon-Hwan Hwang, 2018. "DC Offset Error Compensation Algorithm for PR Current Control of a Single-Phase Grid-Tied Inverter," Energies, MDPI, vol. 11(9), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2308-:d:167277
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    Cited by:

    1. Vattanak Sok & Sun-Woo Lee & Sang-Hee Kang & Soon-Ryul Nam, 2022. "Deep Neural Network-Based Removal of a Decaying DC Offset in Less Than One Cycle for Digital Relaying," Energies, MDPI, vol. 15(7), pages 1-14, April.
    2. Sun-Bin Kim & Vattanak Sok & Sang-Hee Kang & Nam-Ho Lee & Soon-Ryul Nam, 2019. "A Study on Deep Neural Network-Based DC Offset Removal for Phase Estimation in Power Systems," Energies, MDPI, vol. 12(9), pages 1-19, April.

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