Harmonic suppression of LCL grid-connected inverter based on PI control

2021 ◽  
Author(s):  
Hao Hou ◽  
Shengguo Zhang ◽  
Jiawei Yang ◽  
Weiwen Hu
Keyword(s):  
Pi Control ◽  
Harmonic Suppression ◽  
Grid Connected Inverter

Design and control of grid connected inverter for harmonic suppression

2020 ◽  
Vol 18 (5) ◽  
pp. 1349-1356
Author(s):  
Congliang Fei ◽  
Pengfei Xiahou ◽  
Fujun Wang
Keyword(s):  
Design Methodology ◽  
Harmonic Distortion ◽  
Pi Control ◽  
Harmonic Suppression ◽  
Test Results ◽  
Current Waveform ◽  
Content Type ◽  
Simulation And Experiment ◽  
Grid Connected Inverter ◽  
And Control

Purpose This study aims to focus on the grid connected inverter. Design/methodology/approach The grid connected inverter for harmonic suppression was designed, the topological structure of the inverter and the design of LCL filter were analyzed, then a PIR controller was proposed and finally simulation and experiment were carried out. Findings The simulation results showed that the distortion rates of the 5th, 7th and 11th harmonics under PIR control were 0.14%, 0.13% and 0.06%, respectively, which were significantly lower than that under PI control. The system test results also showed that the current waveform under PI control was rough and total harmonic distortion (THD) content was 3.8%; under PIR control, the grid connected current waveform was relatively smooth, with fewer spikes and burrs, and the THD content was 1.9%, indicating that the harmonics were effectively suppressed. Originality/value The experimental results verify that the inverter and PIR controller designed in this study are effective for harmonic suppression. This work makes some contributions to the improvement of the effect of harmonic suppression and promotion of the better application of grid connected inverter.

scholarly journals Harmonic Suppression Strategy of Photovoltaic Grid Connected Inverter Based on Repetitive and PI Control

2021 ◽  
Vol 2136 (1) ◽  
pp. 012032
Author(s):  
Shengqing Li ◽  
Wang Han ◽  
Xiaobao Li ◽  
Zhijian Wang
Keyword(s):  
Dynamic Performance ◽  
Pi Control ◽  
Harmonic Suppression ◽  
Current Feedback ◽  
Current Harmonics ◽  
Current Controller ◽  
Grid Connected Inverter ◽  
The Mathematical Model ◽  
Suppression Strategy ◽  
Harmonic Problem

Abstract To address the serious harmonic problem of grid connected current in photovoltaic grid-connected inverter, a harmonic suppression strategy based on Repetitive and PI control is proposed in this thesis. According to this strategy, the mathematical model of LCL photovoltaic grid-connected inverter is established with the harmonic mechanism analyzed, the repetitive and PI control is added into the current controller, and the capacitive-current feedback is added to enhance the system damping. Furthermore, it puts PI control on the inner loop and the repetitive control on the outer loop to improve the dynamic performance and achieve the harmonic suppression of the system. Moreover, the simulation results show that this method improves the dynamic response ability of the system, and effectively suppress the grid-connected current harmonics as THD of grid-connected current is 19.65% lower than that of PI controller.

scholarly journals Composite Control Strategy of Output Current of LCL Photovoltaic Grid-Connected Inverter

2021 ◽  
Vol 2136 (1) ◽  
pp. 012015
Author(s):  
Shengqing Li ◽  
Xinluo Li ◽  
Qiang Wu ◽  
Xiafei Long
Keyword(s):  
Control Strategy ◽  
Block Diagram ◽  
Harmonic Distortion ◽  
Harmonic Suppression ◽  
Output Current ◽  
Control Block ◽  
Current Harmonics ◽  
Suppression Effect ◽  
Composite Control ◽  
Grid Connected Inverter

Abstract In order to further optimize the output current harmonic suppression effect of photovoltaic grid-connected inverters, a composite control strategy of LCL type photovoltaic grid-connected inverter output current is proposed. This strategy combines proportional complex integral (PCI) control and repetitive control (RC) in parallel, draws a composite control block diagram, introduces a transfer function, and designs PCI and RC control parameters. Prove that the compound control can reduce current harmonics, achieved the purpose of reducing the steady-state error of the fundamental frequency. And adopts a new PCI composite control strategy, which helps to save the cost of the control system. By building the MATLAB/Simulink simulation platform and establishing the PCI+RC composite control model of LCL photovoltaic grid-connected inverter, the comparison of the simulation results shows that compared with the PI+RC control strategy, the total harmonic distortion rate of the grid-connected current is reduced by 25.77. %, significantly improving the quality of grid-connected current.

scholarly journals Grid connected inverter with harmonic suppression based on DSP control

2018 ◽  
Vol 170 ◽  
pp. 042144
Author(s):  
Fei Xia ◽  
Zongze Xia ◽  
Peixian Cong ◽  
Zhixiong Yang ◽  
Hanbiao Song ◽  
...  
Keyword(s):  
Harmonic Suppression ◽  
Grid Connected Inverter ◽  
Dsp Control

Application and Simulation of SVPWM Control Techniques in Three-Phase PV Grid-Connected Inverter

2013 ◽  
Vol 415 ◽  
pp. 81-88
Author(s):  
Yang Xue ◽  
Yuan Li ◽  
Jia Dong Zhang ◽  
Jing Lin ◽  
Jun Tao Yang
Keyword(s):  
Pulse Width Modulation ◽  
Control Method ◽  
Dynamic Performance ◽  
Control Technique ◽  
Pi Control ◽  
Loop Control ◽  
Control Techniques ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Pv Grid

The space vector pulse width modulation (SVPWM), as a new kind of vector control technique, has the advantages of high voltage utilization, less distorted output, simple control method, etc. In this paper, the control technique is applied to three-phase photovoltaic (PV) grid-connected inverter system. It uses double loop control method combined with PI control technique. The simulation model of PV grid-connected inverter system is established in Matlab/Simulink. The simulation results show that the application of SVPWM technique effectively improves the dynamic performance of PV grid inverter system and the THD of grid-connected current is low.

Study on Single-Phase Grid-Connected Inverter Based on PI Control

2014 ◽  
Vol 721 ◽  
pp. 249-252
Author(s):  
Li Jian Hou ◽  
Chang Qing Zhu ◽  
Yue Fei Zhao ◽  
Xue Fei Yan
Keyword(s):  
Single Phase ◽  
Electrical Energy ◽  
Pi Control ◽  
Control Voltage ◽  
Energy Feedback ◽  
Feed Forward Control ◽  
Static Performance ◽  
Grid Connected Inverter ◽  
Set Up ◽  
The Mathematical Model

One of the most important parts in the energy feedback electronic loads is the grid-connected inverter, and its function is to feed the detected electrical energy back to the grid for saving energy. In this paper, the principe of the grid-connected inverter is elaborated, then the PI control and the LCL filter are selected, the mathematical model was set up and the feed forward control voltage was added that suppressing the influence on the system produced by the grid disturbance. The simulation was conducted with the help of Matlab/Simulink, from the simulation waveforms it can be seen that the system dynamic and static performance was good, meanwhile electrical energy can be fed to the grid in the way of unit power factor, eventually the feasibility and superiority of the designing scheme is confirmed.

scholarly journals An Improved Droop Control Strategy for Grid-connected Inverter Power Stability and Harmonic Suppression Under Grid Fluctuation and Inter-harmonics

2021 ◽  
Author(s):  
Wanwan Xu ◽  
Bin Wang ◽  
Jiang Liu ◽  
Da Li
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Control Strategies ◽  
Stability Control ◽  
Droop Control ◽  
Harmonic Suppression ◽  
Current Feedback ◽  
Pass Filter ◽  
Power Stability ◽  
Grid Connected Inverter

This paper presents an improved droop control strategy for grid-connected inverter power stability and power quality under distorted with consideration of grid fluctuation and inter-harmonics. An instantaneous frequency without PLL and amplitude of capacitor voltage feed-forward control strategy is given to power stability control, meanwhile a grid current feedback control is given by an incomplete derivation with a high-pass filter, so that the harmonics and inter-harmonics current can be suppressed. These approaches can provide both good active and reactive power dynamic response under fluctuation of frequency, and rejection ability against harmonic and inter-harmonic voltage. Based on model of inverter, the proposed control strategies are designed in detail. Simulations and experiments are present to validate the effectiveness of proposed method.

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