Optimisation of LCL filter based on closed‐loop total harmonic distortion calculation model of the grid‐connected inverter

2015 ◽  
Vol 8 (6) ◽  
pp. 860-868 ◽  
Author(s):  
Xinxin Zheng ◽  
Lan Xiao ◽  
Yun Lei ◽  
Zilong Wang
Keyword(s):  
Closed Loop ◽  
Harmonic Distortion ◽  
Calculation Model ◽  
Total Harmonic Distortion ◽  
Lcl Filter ◽  
Grid Connected Inverter

scholarly journals A Control Strategy of a Single-phase H6-type Grid-connected Inverter with Low Harmonic Current

2018 ◽  
Vol 173 ◽  
pp. 02041
Author(s):  
Lin Chunxu ◽  
Zhou Chunhua ◽  
Li Wei ◽  
Chen Rui
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Closed Loop ◽  
High Efficiency ◽  
Control Method ◽  
Harmonic Distortion ◽  
Outer Loop ◽  
Lcl Filter ◽  
Loop Control ◽  
Grid Connected Inverter

In order to reduce the total harmonic distortion (THD) of the grid-connected current caused by the high-frequency switching of the inverter, this paper combines the high efficiency single-phase H6-type inverter with LCL filter. The double closed-loop control method that consists of grid-connected current outer loop and capacitor current inner loop is put forward, by which a resonance peak of a low damping LCL filter is eliminated. In the grid-connected current outer loop, quasi proportion resonant (QPR) controller is adopted to overcome the steady-state error and weak anti-jamming capability in traditional PI controller. Finally, a simulation model is built in SIMULINK to verify the research. The simulation results show that, based on the single-phase H6-type inverter and LCL filter, the double closed-loop QPR control strategy can achieve the static error free tracking control of grid-connected current, which makes the system more stable and reduces the THD of grid-connected current effectively.

scholarly journals L vs. LCL Filter for Photovoltaic Grid-Connected Inverter: A Reliability Study

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Ignacio Villanueva ◽  
Nimrod Vázquez ◽  
Joaquín Vaquero ◽  
Claudia Hernández ◽  
Héctor López ◽  
...  
Keyword(s):  
New Technologies ◽  
Harmonic Distortion ◽  
Photovoltaic System ◽  
Nonlinear Loads ◽  
Lcl Filter ◽  
Mean Time Between Failures ◽  
Time Between Failures ◽  
Power Injection ◽  
Grid Connected Inverter

The increasing use of photovoltaic systems entails the use of new technologies to improve the efficiency and power quality of the grid. System performance is constantly increasing, but its reliability decreases due to factors such as the uncontrolled operation, the quality of the design and quantity of components, and the use of nonlinear loads that may lead to distortion in the signal, which directly affects the life of the system globally. This article presents an analysis of the reliability of a single-phase full-bridge inverter for active power injection into the grid, which considers the inverter stage with its coupling stage. A comparison between an L filter and an LCL filter, which comprise the coupling stage, is made. Reliability prediction is based on metrics, failure rate, mean time between failures, and total harmonic distortion. The analysis and numerical simulation are performed. Finally, filter considerations are suggested to extend the reliability of the inverter in a photovoltaic system.

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