Finite-Time Backstepping Control for Stand-Alone Three-Phase Voltage-Source Inverters Based on Disturbance Observer.
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| Title: | Finite-Time Backstepping Control for Stand-Alone Three-Phase Voltage-Source Inverters Based on Disturbance Observer. |
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| Authors: | Wu, Shiwei1 (AUTHOR), Pan, Dejun1,2 (AUTHOR), Zhang, Guanguan2,3 (AUTHOR), Chang, Le1,3 (AUTHOR), Wang, Xiaoling1,2 (AUTHOR), Fu, Cheng1,3 (AUTHOR) cfu@qdu.edu.cn |
| Source: | Energies (19961073). Feb2026, Vol. 19 Issue 3, p781. 14p. |
| Subject Terms: | *Backstepping control method, *Electric inverters, *Dynamic models, *Sliding mode control, *Uncertain systems |
| Abstract: | For the three-phase voltage-source inverters (VSIs), load disturbances and parameter uncertainties degrade the quality of output voltages, potentially leading to system instability. To improve steady-state precision and disturbance rejection, this paper suggests a finite-time backstepping control (FTBC) strategy that incorporates a fixed-time sliding mode disturbance observer (FTSMDO). Firstly, this paper establishes a new dynamic model of the three-phase VSI considering load disturbances, parameter uncertainty and cross-coupling effect. Subsequently, a fixed-time disturbance observer is then developed to precisely estimate the uncertain disturbances, with its convergence time not reliant on the system's initial conditions. Concurrently, a finite-time differentiator is developed to achieve the desired signals, thereby sidestepping the "explosion of complexity" problem. A finite-time controller is constructed to obtain stable three-phase output voltages. Theoretical and test analysis demonstrate the proposed method is effective. Compared with the PI control, the proposed strategy improves dynamic performance and enhances disturbance-rejection capability under time-varying load disturbances. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | For the three-phase voltage-source inverters (VSIs), load disturbances and parameter uncertainties degrade the quality of output voltages, potentially leading to system instability. To improve steady-state precision and disturbance rejection, this paper suggests a finite-time backstepping control (FTBC) strategy that incorporates a fixed-time sliding mode disturbance observer (FTSMDO). Firstly, this paper establishes a new dynamic model of the three-phase VSI considering load disturbances, parameter uncertainty and cross-coupling effect. Subsequently, a fixed-time disturbance observer is then developed to precisely estimate the uncertain disturbances, with its convergence time not reliant on the system's initial conditions. Concurrently, a finite-time differentiator is developed to achieve the desired signals, thereby sidestepping the "explosion of complexity" problem. A finite-time controller is constructed to obtain stable three-phase output voltages. Theoretical and test analysis demonstrate the proposed method is effective. Compared with the PI control, the proposed strategy improves dynamic performance and enhances disturbance-rejection capability under time-varying load disturbances. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961073 |
| DOI: | 10.3390/en19030781 |
