Active Damping Adaptive Controller for Grid-Connected Inverter Under Weak Grid
| Autor: | Guojin Li, Li Hong, Yanming Chen, Ding Xin, Ruinan Xue |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Lyapunov function
asymptotic stability State variable Adaptive control General Computer Science Computer science General Engineering Grid backstepping method TK1-9971 symbols.namesake Exponential stability Control theory LCL grid-connected inverter Backstepping symbols Inverter General Materials Science Electrical engineering. Electronics. Nuclear engineering |
| Zdroj: | IEEE Access, Vol 9, Pp 132442-132454 (2021) |
| ISSN: | 2169-3536 |
| DOI: | 10.1109/access.2021.3115493 |
| Popis: | The stability of grid-connected inverters is very sensitive to varying grid impedance, especially in the weak grid condition. In this paper, based on the Lyapunov method and with the micro-grid impedance identification, an active damping adaptive control strategy is proposed to guarantee local asymptotic stability for an LCL inverter system. First, using the backstepping design and taking the state variable errors as new variables, an appropriate Lyapunov function is constructed, so that the asymptotic stability control law can be obtained. Then, with this asymptotic stability controller, taking the varying impedance into account, an adaptive controller is developed using the Lyapunov direct method. Hence, the controller presented here can assure asymptotic stability, the system performance can also be improved instantly according to the adaptive control, and the expected stability and performance can also be achieved. Finally, the feasibility of the proposed control strategy was verified via a simulation and an experiment. |
| Databáze: | OpenAIRE |
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