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Adaptive current harmonics suppression strategy for grid-tie inverters.

Zhifeng Pan1, Xiaohong Wang1, Quanxue Guan2

  • 1School of Automation Science and Engineering, South China University of Technology, Guangzhou, 510640, China.

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Summary

This study introduces an adaptive algorithm to reduce current harmonics in three-phase converters, even with grid voltage distortions. The method uses a phase-locked loop (PLL) for accurate angle estimation and improves total harmonic distortion.

Keywords:
Adaptive compensationFrequency variationGrid-connected inverterHarmonic suppression

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Grid-connected converters experience voltage errors from switching modulation and dead-time effects.
  • These errors cause current harmonics, degrading power quality and system performance.
  • Accurate grid voltage angle estimation is crucial for effective compensation.

Purpose of the Study:

  • To develop an adaptive compensation algorithm for suppressing grid-side current harmonics in three-phase converters.
  • To model and compensate for voltage errors caused by switching modulation and dead-time effects.
  • To improve the robustness and frequency adaptability of the control strategy.

Main Methods:

  • Derivation of mathematical models for voltage errors as a function of grid voltage angle.
  • Application of a truncated Fourier series expansion to estimate unmeasurable voltage errors.
  • Implementation of a feed-forward compensation strategy within the current control loop.
  • Utilizing a phase-locked loop (PLL) for adaptive grid frequency tracking.

Main Results:

  • The proposed adaptive algorithm effectively suppresses current harmonics in three-phase converters.
  • Demonstrated significant reduction in total harmonic distortion (THD) compared to PI and repetitive control.
  • Achieved strong robustness against grid voltage distortions and insensitivity to grid frequency variations.

Conclusions:

  • The adaptive compensation algorithm offers a superior solution for mitigating current harmonics in grid-connected converters.
  • The method simplifies controller design and enhances dynamic performance.
  • The approach provides a robust and adaptable control strategy for modern power systems.