It tends to cause system oscillation when the inverter with a phase-locked loop based on proportional integral controller (PI-PLL) is connected to the weak grid. To improve the oscillation suppression ability of the grid-connected inverter, a linear active disturbance rejection controller is applied to PLL (LADRC-PLL). Considering the influence of linear extended state observer, voltage outer-loop, current inner-loop and frequency coupling, the admittance model of the grid-connected inverter with LADRC-PLL is established. Based on the established admittance model and the generalized Nyquist criterion, the system stabilities of the grid-connected inverters with LADRC-PLL and PI-PLL are compared. The comparison results indicate that the grid-connected inverter with LADRC-PLL has better adaptability to the weak grid and shows a certain ability to suppress the sub- and super-synchronous oscillation. Then, the influence of the control parameters of LADRC-PLL on the system stability is studied. It is found that the system keeps stable when the control parameter of LADRC-PLL is changed in a relatively wide range, which indicates LADRC-PLL has good robustness. Furthermore, the dynamic performances of the grid-connected inverters with LADRC-PLL and PI-PLL are analyzed. It is revealed that the grid-connected inverter with LADRC-PLL has better dynamic performance. Finally, the correctness of the analysis is verified by experiments.
Admittance Modeling and Stability Analysis of Grid-Connected Inverter with LADRC-PLL
2021-12-01
Xie , Z , Chen , Y , Wu , W , Gong , W , Zhou , L , Zhou , X & Guerrero , J M 2021 , ' Admittance Modeling and Stability Analysis of Grid-Connected Inverter with LADRC-PLL ' , IEEE Transactions on Industrial Electronics , vol. 68 , no. 12 , pp. 12272 - 12284 . https://doi.org/10.1109/TIE.2020.3044789
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
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