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| A phase‑locked loop using ESO‑based loop flter for grid‑connected converter: performance analysis |
| BaolingGuo,SeddikBacha,MazenAlamir,JulienPouget |
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| (School of Engineering, (HES-SO) University of Applied Sciences and Arts of Western Switzerland, Sion, 1950 Valais, Switzerland;Institute of Engineering Grenoble, University Grenoble Alpes, CNRS, G2Elab, 38000 Grenoble, France;Institute of Engineering Grenoble, University Grenoble Alpes, CNRS, GIPSA-Lab, 38400 Saint Martin D’Hères, France) |
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| DOI：https://doi.org/10.1007/s11768-021-00036-0 |
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| 基金项目:This paper was supported by G2elab, Grenoble INP, University Grenoble Alpes, France and School of Engineering, HES-SO, Valais, Switzerland. Open Access funding provided by Haute Ecole Specialisée de Suisse occidentale (HES-SO). |
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| A phase‑locked loop using ESO‑based loop flter for grid‑connected converter: performance analysis |
| Baoling Guo,Seddik Bacha,Mazen Alamir,Julien Pouget |
| (School of Engineering, (HES-SO) University of Applied Sciences and Arts of Western Switzerland, Sion, 1950 Valais, Switzerland;Institute of Engineering Grenoble, University Grenoble Alpes, CNRS, G2Elab, 38000 Grenoble, France;Institute of Engineering Grenoble, University Grenoble Alpes, CNRS, GIPSA-Lab, 38400 Saint Martin D’Hères, France) |
| Abstract: |
| An extended state observer (ESO)-based loop flter is designed for the phase-locked loop (PLL) involved in a disturbed gridconnected converter (GcC). This ESO-based design enhances the performances and robustness of the PLL, and, therefore, improves control performances of the disturbed GcCs. Besides, the ESO-based LF can be applied to PLLs with extra flters for abnormal grid conditions. The unbalanced grid is particularly taken into account for the performance analysis. A tuning approach based on the well-designed PI controller is discussed, which results in a fair comparison with conventional PItype PLLs. The frequency domain properties are quantitatively analysed with respect to the control stability and the noises rejection. The frequency domain analysis and simulation results suggest that the performances of the generated ESO-based
controllers are comparable to those of the PI control at low frequency, while have better ability to attenuate high-frequency measurement noises. The phase margin decreases slightly, but remains acceptable. Finally, experimental tests are conducted with a hybrid power hardware-in-the-loop benchmark, in which balanced/unbalanced cases are both explored. The obtained results prove the efectiveness of ESO-based PLLs when applied to the disturbed GcC. |
| Key words: Grid-connected converters · Grid disturbances · Phase-locked loop · Loop flter · Extended state observer · Tuning approach · Stability analysis · Phase margin · Noises attenuation · Power hardware-in-the-loop (PHIL) test |
