A novel repetitive control scheme for three-phase grid-connected inverter with LCL filter

2012 ◽  
Author(s):  
Tao Liu ◽  
Xiang Hao ◽  
Xu Yang ◽  
Ming Zhao ◽  
Qingyun Huang ◽  
...  
Keyword(s):  
Repetitive Control ◽  
Lcl Filter ◽  
Three Phase ◽  
Control Scheme ◽  
Grid Connected Inverter

scholarly journals A Repetitive Control Scheme Aimed at Compensating the 6k + 1 Harmonics for a Three-Phase Hybrid Active Filter

Energies ◽  
2016 ◽  
Vol 9 (10) ◽  
pp. 787 ◽  
Author(s):  
Zhaoxu Luo ◽  
Mei Su ◽  
Jian Yang ◽  
Yao Sun ◽  
Xiaochao Hou ◽  
...  
Keyword(s):  
Repetitive Control ◽  
Active Filter ◽  
Three Phase ◽  
Control Scheme

scholarly journals A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter

2021 ◽  
Vol 11 (14) ◽  
pp. 6256
Author(s):  
Mohamad Amin Ghasemi ◽  
Seyed Fariborz Zarei ◽  
Saeed Peyghami ◽  
Frede Blaabjerg
Keyword(s):  
Control Method ◽  
Controller Design ◽  
Current Control ◽  
System Stability ◽  
State Equations ◽  
Lcl Filter ◽  
Control Scheme ◽  
Grid Connected Inverter ◽  
The Stability ◽  
Grid Side

This paper proposes a nonlinear decoupled current control scheme for a grid-connected inverter with LCL filter. Decoupling the active and reactive current control channels is one of the main demands in the control of inverters. For inverters with an L filter, the decoupling can be achieved by a proper feed-forward of grid voltages. However, the coupling of channels is a complex issue for converters with LCL filters. The resonance mode of the LCL filter may cause instability, which adds more complexity to the analysis. In this paper, state equations of the system are provided, which highlight the coupling between active and reactive currents injected into the grid. Accordingly, a non-linear control scheme is proposed which effectively decouples the channels and dampens the resonant modes of the LCL filter. The stability of the proposed control method is verified by the Lyapunov criterion. Independency of the system stability to the grid-impedance is another feature of the proposed approach. Moreover, only grid-side currents are needed for implementation of the proposed scheme, avoiding the need for additional current sensors for the output capacitor and grid-side inductor. For accurate modelling of the inverter, the computation and PWM sampling delays are included in the controller design. Finally, various case studies are provided that verify the performance of the proposed approach and the stability of the system.

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