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.

Five Level Photovoltaic Grid-Connected Inverter Based on Repetitive and PI Control

2013 ◽  
Vol 273 ◽  
pp. 327-331
Author(s):  
Hai Zhu Yang ◽  
Song Zhen Yuan
Keyword(s):  
Harmonic Distortion ◽  
Control Mode ◽  
Pi Control ◽  
Compound Control ◽  
Control Precision ◽  
Control Scheme ◽  
Switch Type ◽  
Real Time Tracking ◽  
Grid Connected Inverter ◽  
Distortion Rate

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. This kind of control mode can enables the system has excellent static and dynamic characteristics, to improve the inverter control precision. The results show that, the five-level 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.

scholarly journals Research on New Energy Grid Control Technology

2018 ◽  
Vol 53 ◽  
pp. 01003
Author(s):  
LU Zhengtong ◽  
LI Shiqiang ◽  
WU Yingjun ◽  
SUN Lu ◽  
CHEN Guozhi ◽  
...  
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Harmonic Distortion ◽  
Pi Control ◽  
Nonlinear Load ◽  
Compound Control ◽  
New Energy ◽  
Energy Grid ◽  
Distortion Rate

Aiming at the poor waveform quality of the new energy grid connected under the traditional PI control strategy, based on the theory of repetitive control method, a compound control trategy is proposed. Through the analysis of the compound control module and simulation, the results show that grid harmonic distortion rate can be reduced about 2% at the same nonlinear load, the compound control strategy can suppress the load disturbance signal effectively, and the simulation results demonstrate the effectiveness of the proposed method.

Dual Piezoelectric-Driving Pneumatic Digital Valve Control Method Simulation Research

2013 ◽  
Vol 816-817 ◽  
pp. 367-370
Author(s):  
You Xiong Xu ◽  
Song Qing Zhu
Keyword(s):  
Control Algorithm ◽  
Control Method ◽  
Simulation Research ◽  
Proportional Control ◽  
Waste Gas ◽  
Joint Simulation ◽  
Compound Control ◽  
Simulation Results ◽  
Valve Control ◽  
Pressure Overshoot

Because its pilot stage is a two-position tree-way valve, the previously research piezoelectric type pneumatic digital valve also constantly works in on or off state even in the case of output stable pressure, which makes the valve with pressure fluctuation, waste gas and other shortcomings. In order to overcome the above problem, a novel pneumatic digital valve driven by dual piezoelectric is presented in this thesis. And its simulation model is built based on the AMESim and Matlab/simulink joint simulation platform. On this basis, its control method is researched by the simulation. The simulation shows that the Bang-Bang and the PWM control algorithm can basically achieve the digital proportional control of the valve, but the valve has overshoot. For this, the compound control algorithm with PID plus PWM is proposed to control the valve. The simulation results show that this algorithm is effective which can reduce the pressure overshoot.

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

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.

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