Current control of grid connected inverter with LCL filter utilizing two degree-of-freedom control

2013 ◽  
Author(s):  
Jing Wang ◽  
A. Monti
Keyword(s):  
Current Control ◽  
Degree Of Freedom ◽  
Lcl Filter ◽  
Grid Connected Inverter ◽  
Two Degree Of Freedom

scholarly journals Discrete-Time DC-Link Voltage and Current Control of a Grid-Connected Inverter with LCL-Filter and Very Small DC-Link Capacitance

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5613 ◽  
Author(s):  
Oliver Kalmbach ◽  
Christian Dirscherl ◽  
Christoph M. Hackl
Keyword(s):  
Discrete Time ◽  
Controller Design ◽  
Linear Quadratic Regulator ◽  
Current Control ◽  
Control Loop ◽  
Linear Quadratic ◽  
Lcl Filter ◽  
Current Controller ◽  
Voltage Controller ◽  
Grid Connected Inverter

The paper presents a controller design for grid-connected inverters (GCI) with very small dc-link capacitance that are coupled to the grid via an LCL filter. The usual controller designs would fail and result in instability. The proposed controller has a cascaded structure with a current controller as inner control loop and an outer dc-link voltage controller. The controller design is performed in discrete time and it is based on a detailed stability analysis of the dc-link voltage controller to determine the controller parameters which guarantee stability for all operating points. The inner loop is a state-feedback current controller that is designed based on the discrete linear-quadratic regulator (DLQR) theory. An additional integral error feedback assures steady-state accuracy of the current control loop. The simulation and experimental results validate performance and stability of proposed controller design.

A New Feedback Method for PR Current Control of LCL-Filter-Based Grid-Connected Inverter

2010 ◽  
Vol 57 (6) ◽  
pp. 2033-2041 ◽  
Author(s):  
Guoqiao Shen ◽  
Xuancai Zhu ◽  
Jun Zhang ◽  
Dehong Xu
Keyword(s):  
Current Control ◽  
Lcl Filter ◽  
Feedback Method ◽  
Grid Connected Inverter
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