An Improved Repetitive Control Scheme for Grid-Connected Inverter With Frequency-Adaptive Capability

2013 ◽  
Vol 60 (2) ◽  
pp. 814-823 ◽  
Author(s):  
Dong Chen ◽  
Junming Zhang ◽  
Zhaoming Qian
Keyword(s):  
Repetitive Control ◽  
Control Scheme ◽  
Adaptive Capability ◽  
Grid Connected Inverter

Improved repetitive control scheme for grid‐connected inverter with frequency adaptation

2016 ◽  
Vol 9 (5) ◽  
pp. 883-890 ◽  
Author(s):  
Qiangsong Zhao ◽  
Yongqiang Ye ◽  
Guofeng Xu ◽  
Mingzhe Zhu
Keyword(s):  
Repetitive Control ◽  
Frequency Adaptation ◽  
Control Scheme ◽  
Grid Connected Inverter

The Simulation Research of the Five Level Photovoltaic Grid-Connected Inverter Based on Repetitive and PI Control

2012 ◽  
Vol 608-609 ◽  
pp. 34-37
Author(s):  
Jie Liu ◽  
Song Zhen Yuan
Keyword(s):  
Control Algorithm ◽  
Repetitive Control ◽  
Harmonic Distortion ◽  
Pi Control ◽  
Simulation Research ◽  
Compound Control ◽  
Control Scheme ◽  
Switch Type ◽  
Real Time Tracking ◽  
Grid Connected Inverter

Introducing a kind of bidirectional switch type five level inverter, and put forward the compound control scheme which repetitive control and PI adjustment are combined. And a detailed analysis of the repetitive control algorithm. Through the Matlab/simulink to simulate under different control modes. The results show that, the five-livel inverter which using repetitive PI control, its output grid-connected current waveform stability, harmonic distortion rate is small, and can real-time tracking the network voltage.

scholarly journals A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4225
Author(s):  
Chengbi Zeng ◽  
Sudan Li ◽  
Hanwen Wang ◽  
Hong Miao
Keyword(s):  
Repetitive Control ◽  
Harmonic Distortion ◽  
Adaptive Scheme ◽  
Computational Burden ◽  
Weak Grid ◽  
Control Scheme ◽  
Sample Frequency ◽  
Fractional Delay ◽  
Pr Controller ◽  
Online Tuning

Repetitive control (RC) is gradually used in inverters tied with weak grid. To achieve the zero steady-state error tracking of inverter current and compensate the harmonic distortion caused by frequency fluctuation, a frequency adaptive (FA) control scheme for LCL-type inverter connected with weak grid is proposed. This scheme adopts a proportional resonance (PR) controller in parallel with RC (PRRC) to overcome the disadvantages caused by RC inherent one-cycle time delay. A fractional delay (FD) filter based on the Newton structure is proposed to approximate the fraction item of fs/f, where fs and f are sample frequency and grid frequency, respectively. The structure of the proposed FD filter is relatively simple; moreover, coefficients of the filter maintain constant so as not to need online tuning even when grid frequency fluctuates, which decreases the computational burden considerably. The feasibility and effectiveness of the proposed FA control scheme, named as Newton-FAPRRC, are all verified by the simulation and experimental results.

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