Control of Grid Connected Inverter with PR Controller and LCL Filter for Interfacing Renewable Energy Sources

2014 ◽  
Vol 984-985 ◽  
pp. 979-989
Author(s):  
K. Deepthi ◽  
A. Vijayakumari ◽  
Arun Joshy
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Design Procedure ◽  
Lcl Filter ◽  
Pwm Inverter ◽  
Grid Impedance ◽  
Pr Controller ◽  
Primary Focus ◽  
Grid Connected Inverter ◽  
Configuration Changes

This paper presents a design procedure for Proportional-Resonant (PR) controller and a third order LCL filter which decide the performance of the converter that is used to interface the renewable energy source to the grid. The primary focus of the paper is to evaluate the performance of the controller with the filter for a microgrid application. A scaled down model of microgrid available in the department laboratory is considered for the performance evaluation of the designed controller. The system is simulated with a 2kVA PWM inverter and tested under conditions such as change in grid impedance, grid frequency and step change in reference current. The simulation results show that the PR controller with LCL filter tracks the reference with zero steady state error and the controller is found to be immune to grid frequency and micro-grid configuration changes.

A Novel Multi-Functional Grid-Connected Inverter of Renewable Energy Resources

2013 ◽  
Vol 448-453 ◽  
pp. 2191-2194
Author(s):  
Lei Zhou ◽  
Hong Da Liu ◽  
Ming Jie Chen ◽  
Nai Jun Shen
Keyword(s):  
Renewable Energy ◽  
Distribution Systems ◽  
Reactive Power ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Unit Vector ◽  
Renewable Energy Resources ◽  
Point Of Common Coupling ◽  
Grid Connected Inverter ◽  
And Control

On the basis of analyzing the synthesis application of p-q (instantaneous reactive power) theory and unit vector template, a multi-functional grid-connected inverter (MFGCI) with auxiliary services on power quality enhancement in micro-grid (MG) is presented. The novel control strategy for achieving maximum benefits from these MFGCI when installed in AC MG access to 3-phase 4-wire distribution systems by isolated transformer at the point of common coupling (PCC). This kind of inverter can not only deliver the power generation of renewable energy sources (RESs), but also can perform as active power filter (APF) at their PCC as well as can improve the efficiency of inverter and decrease the hardware investment. Finally, both feasibility and effectiveness of this new topologies and control strategies of MFGCI are verified by PSCAD/EMTDC.

scholarly journals An Integrated Design Approach for LCL-Type Inverter to Improve Its Adaptation in Weak Grid

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2637
Author(s):  
Zheng ◽  
Liu ◽  
Liu ◽  
Li ◽  
Dai ◽  
...  
Keyword(s):  
Design Method ◽  
Robustness Analysis ◽  
Integrated Design ◽  
System Stability ◽  
Lcl Filter ◽  
Weak Grid ◽  
Grid Impedance ◽  
Integrated Design Approach ◽  
Simulation And Experiment ◽  
Grid Connected Inverter

To improve the robustness of grid-connected inverter against grid impedance in a weak grid an integrated design method of LCL-filter parameters and controller parameters is proposed. In the method the inherent relation of LCL-filter parameters and controller parameters is taken into consideration to realize their optimized match. A parameter normalization scheme is also developed to facilitate the system stability and robustness analysis. Based on the method all normalization parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL parameter and controller parameter can be achieved immediately by restoring normalization parameters. The proposed design method can guarantee the inverter stability and robustness simultaneously without needing any compensation network, additional hardware, or the complicated iterative computations which cannot be avoided for the conventional inverter design method. Simulation and experiment results have validated the superiority of the proposed inverter design method.

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