A phase-locked loop using ESO-based loop filter for grid-connected converter:performance analysis
Baoling Guo1
Seddik Bacha2
Mazen Alamir3
Julien Pouget1
1.School of Engineering,(HES-SO)University of Applied Sciences and Arts of Western Switzerland,Sion,1950 Valais,Switzerland2.Institute of Engineering Grenoble,University Grenoble Alpes,CNRS,G2Elab,38000 Grenoble,France3.Institute of Engineering Grenoble,University Grenoble Alpes,CNRS,GIPSA-Lab,38400 Saint Martin D'Hères,France
摘要：An extended state observer(ESO)-based loop filter is designed for the phase-locked loop(PLL)involved in a disturbed grid-connected 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 filters 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 PI-type 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 effectiveness of ESO-based PLLs when applied to the disturbed GcC.
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论文发表日期：2021-02-05
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 49-63 )
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