scholarly journals Robust Tracking Control of a Three-Phase Charger under Unbalanced Grid Conditions

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3389 ◽  
Author(s):  
Chivon Choeung ◽  
Meng Leang Kry ◽  
Young Il Lee
Keyword(s):  
Control Method ◽  
Current Control ◽  
Control Technique ◽  
Constant Current ◽  
Linear Matrix ◽  
Robust Tracking Control ◽  
Integral Control ◽  
Three Phase ◽  
Proportional Integral Control ◽  
Unbalanced Grid

This paper presents a robust control technique for three-phase chargers under unbalanced grid conditions. The control method consists of inner-loop robust grid-current control and outer-loop proportional integral control for constant current (CC) and constant voltage (CV) control. A dual-current control for the inner-loop positive and negative sequence is employed to eliminate the unbalanced current caused by the grid so that a constant current and voltage can be provided to the batteries. The inner-loop robust controllers utilize state feedback with integral action in the dq-synchronous frame. A linear matrix inequality-based optimization scheme is used to determine stabilizing gains of the controllers to maximize the convergence rate to steady state in the presence of uncertainties. The uncertainties of the system are described as the potential variation range of the inductance and resistance in the L-filter.

Simple current control method for three‐phase VSC under unbalanced grid condition

2018 ◽  
Vol 11 (7) ◽  
pp. 1161-1168 ◽  
Author(s):  
Xiong Du ◽  
Shida Gu ◽  
Guoning Wang ◽  
Heng‐Ming Tai ◽  
Yongliang Ji
Keyword(s):  
Control Method ◽  
Current Control ◽  
Three Phase ◽  
Unbalanced Grid

scholarly journals Comparison between PI and PR Current Controllers of a Grid- Connected Photovoltaic System Under Load Variation

2018 ◽  
Vol 9 (3) ◽  
pp. 1311 ◽  
Author(s):  
Soukaina Essaghir ◽  
Mohamed Benchagra ◽  
Noureddine El barbri
Keyword(s):  
Power Factor ◽  
Control Method ◽  
Current Control ◽  
Photovoltaic System ◽  
Control Technique ◽  
Unity Power Factor ◽  
Control Loops ◽  
Proposed Model ◽  
Three Phase ◽  
Pr Controller

This paper presents a current control technique for a three-phase grid-connected DC /AC inverter which is used in photovoltaic systems. A Proportional-Resonant (PR) controller is used for replacing the conventional Proportional-Integral (PI) controller in this system. By comparison with the conventional PI control method, the PR control can introduce an infinite gain at the fundamental frequency and hence can achieve zero steady-state error. The proposed model is based on two control loops: the first control loop regulates DC link voltage and the second one is used to keep the injected current to the grid in phase with the voltage by means of a Phase Locked Loop (PLL) in order to achieve a unit power factor and to adjust the output power as required. In order to examine the effectiveness of the suggested control, a simulation using the Matlab/Simulink software has been done and it’s concluded from the simulation results that the presented control by using the PR controller can be able to maintain maximum active power and to keep always a unity power factor despite variation load.

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