Suppression of DC Link Voltage Fluctuation and Dynamic Response Optimization in Grid-Tied Inverters

DOI: https://doi.org/10.62517/jes.202502407

Author(s)

Tianfeng Lan, Jie Yao*, Guixiang Huang

Affiliation(s)

Shanghai Testing and Inspection Institute for Electrical Equipment Co., Ltd., Shanghai, China *Corresponding Author

Abstract

During operation, the DC bus in single-phase power conversion systems inevitably generates double-frequency voltage ripple. To address the issue of current reference tracking accuracy, it is common practice in engineering to embed notch filters within the control algorithm. However, traditional solutions suffer from inherent drawbacks such as sluggish dynamic response and a tendency for system oscillations. This paper innovatively proposes a real-time computational algorithm based on system parameters to identify the second harmonic voltage component. This approach requires neither modifications to the main circuit topology nor additional filtering stages in the voltage loop. By redesigning the voltage outer loop controller structure, the dynamic response characteristics of the system are significantly enhanced, effectively suppressing overshoot during voltage regulation. Combined with a current inner loop control strategy employing a quasi-proportional resonant regulator, the constructed dual closed-loop control system achieves excellent dynamic performance and stability while maintaining steady-state precision. Simulation results based on MATLAB /Simulink confirm the feasibility and superiority of the proposed control scheme.

Keywords

Harmonic Voltage Identification; Dual Closed-loop Control; Quasi- Proportional Resonant Control; Dynamic Performance; Second Harmonic Suppression

References

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