scholarly journals Cascaded NPC/H-Bridge Inverter with Simplified Control Strategy and Superior Harmonic Suppression

10.5772/22611 ◽  
2011 ◽  
Author(s):  
Tom Wanjekeche ◽  
Dan V. ◽  
Adisa A.
Keyword(s):  
Control Strategy ◽  
Harmonic Suppression

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.

Direct current control strategy of LCL‐type converter for harmonic suppression under distorted grid condition

2020 ◽  
Vol 13 (17) ◽  
pp. 3922-3930
Author(s):  
Qi Wang ◽  
Wenping Qin ◽  
Wei Dai ◽  
Xiaoqing Han ◽  
Lei Wang ◽  
...  
Keyword(s):  
Direct Current ◽  
Control Strategy ◽  
Current Control ◽  
Harmonic Suppression ◽  
Distorted Grid ◽  
Direct Current Control

DC voltage control strategy of chain star STATCOM with second‐order harmonic suppression

2016 ◽  
Vol 9 (14) ◽  
pp. 2645-2653 ◽  
Author(s):  
Yingjie Wang ◽  
Yushuo Chai ◽  
Jianbo Tang ◽  
Xibo Yuan ◽  
Chenyang Xia
Keyword(s):  
Control Strategy ◽  
Voltage Control ◽  
Second Order ◽  
Harmonic Suppression ◽  
Voltage Control Strategy ◽  
Dc Voltage ◽  
Dc Voltage Control

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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