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Advanced Inductor Current Control Schemes of Grid-Connected Quasi‐Z‐Source Inverter in Wind Turbine-based PMSG
Kazem Mokhtari , Shokrollah Shokri-Kojori , Mahdi Aliyari Shoorehdeli
Abstract:   (129 Views)
This paper presents three advanced inductor current control schemes for grid-connected Quasi-Z-Source inverters with LCL filters in wind power applications. The first scheme employs a sliding mode control (SMC)-based controller to regulate inductor current via a shoot-through ratio. The second scheme introduces a fuzzy gain scheduling PID controller (FGS-PID), which replaces the SMC for inductor current regulation. The FGS-PID utilizes fuzzy rule-based reasoning to dynamically adjust PID gains based on the error signal and its derivative, enhancing transient response, reducing oscillations, and ensuring system stability and accuracy. The performance of these controllers is evaluated against a traditional PI controller under identical conditions. Comprehensive simulations on MATLAB/SIMULINK and experimental hardware-in-the-loop (HIL) testing demonstrate  that: (i) SMC reduces capacitor voltage ripple to ±5 V (0.35%)—a 62% improvement over the PI controller (±13 V, 0.92%)—and limits grid current total harmonic distortion (THD) to ≤1.8%; (ii) FGS‑PID achieves intermediate performance (±10 V ripple, ≤2.5% THD) with only heuristic tuning; and (iii) SMC maintains stable operation with 31.7% current overshoot during grid fault recovery, compared to 41.1% for PI. The results provide valuable insights into the strengths and limitations of each controller, offering a foundation for future advancements in wind power systems.
 
Keywords: Quasi Z-Source inverter, Wind energy, Fuzzy PID controller, Sliding mode controller, Hardware-in-the-Loop.
Full-Text [PDF 1728 kb]   (41 Downloads)    
Type of Study: Research Paper | Subject: Converters
Received: 2025/09/26 | Revised: 2026/06/29 | Accepted: 2026/06/09
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Creative Commons License
© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.