Research on control strategy of single-phase photovoltaic grid-connected inverter with LCL filter

2015 ◽  
pp. 37-42
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Lcl Filter ◽  
Grid Connected Inverter

Separated-PI Control Strategy and Stability Analysis of a Single-Phase Inverter Connected to the Grid with a LCL Filter

2013 ◽  
Vol 291-294 ◽  
pp. 2464-2469
Author(s):  
Dian Li Hou ◽  
Qing Fan Zhang ◽  
Xiao Liu
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Dynamic Performance ◽  
Structural Features ◽  
Lcl Filter ◽  
Phase Inverter ◽  
Hurwitz Stability ◽  
Single Phase Inverter ◽  
Grid Connected Inverter ◽  
The Stability

Because of the powerful filtering ability the third-order LCL filters has been widely used in grid-connected inverters, but there are some problems to be solved on systems stability and control accuracy. A separated-PID control strategy has been proposed according to the PID characteristics and the structural features of a single-phase inverter connected to the grid with a LCL filter. This control strategy has some advantages as a strong dynamic tacking stability, and the system output has a small steady state error. A detailed description is presented on this control strategy applied in the single-phase grid inverter with a LCL filter. According to the Routh-Hurwitz stability criterion, the stability of a grid-connected inverter system based on the proposed control strategy has been analyzed. Finally, waveforms of this inverter have been presented through a simulation to show the steady and dynamic performance of the proposed scheme.

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.

Modeling and Control of a Single-Phase Grid-Connected Inverter with LCL Filter

2021 ◽  
Vol 19 (02) ◽  
pp. 250-259
Author(s):  
Jakson Paulo Bonaldo ◽  
Jose de Arimateia Olimpio Filho ◽  
Augusto Matheus dos Santos Alonso ◽  
Helmo Kelis Morales Paredes ◽  
Fernando Pinhabel Marafao
Keyword(s):  
Single Phase ◽  
Lcl Filter ◽  
Modeling And Control ◽  
Grid Connected Inverter ◽  
And Control

scholarly journals Stability of Grid-Connected Inverter with LCL Filter

2020 ◽  
Vol 5 (4) ◽  
pp. 91-96
Author(s):  
Marek Pástor ◽  
Jaroslav Dudrik
Keyword(s):  
Single Phase ◽  
Active Damping ◽  
Lcl Filter ◽  
Resonant Controller ◽  
Grid Connected Inverter ◽  
Output Filter

<p>The paper analyses oscillations in a single-phase grid connected inverter with the LCL output filter. Passive and active damping techniques are designed and compared by simulations. The inverter is controlled by a proportional resonant controller.</p>

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