scholarly journals Harmonic Coupling Analysis and Suppression Strategy of Grid-connected Photovoltaic Inverter

2018 ◽  
Vol 173 ◽  
pp. 03077
Author(s):  
Tao Tong ◽  
Xinyan Zhan ◽  
Liang Gao ◽  
Jiajun Zhang
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
Parallel Connection ◽  
Capacitive Current ◽  
Three Phase ◽  
Maximum Power Tracking ◽  
Bode Diagram ◽  
Three Phase Inverter ◽  
Suppression Strategy ◽  
Harmonic Resonance

For the complex harmonic coupling problem caused by the parallel connection of grid-connected photovoltaic inverters to the grid, the mathematical models of a single three-phase inverter and two three-phase inverters connected in parallel are established in this paper. The transfer function is derived and the resonant characteristics of grid-connected single inverter and parallel grid-connected multi-inverters are analyzed by using Bode diagram. On the basis of the maximum power tracking link, This paper proposes a control strategy which combines the double closed-loop of current by using grid-connected voltage and capacitive current with the proportional feedforward compensation of grid voltage, which maximizes the use of solar energy and has a better harmonic resonance suppression capability at the same time. The effectiveness and correctness of the proposed control strategy are verified by Matlab/Simulink system simulation.

scholarly journals Control Strategy of Photovoltaic Grid Connected System Based on PI and QPR Double Closed Loop Control

2021 ◽  
Vol 2136 (1) ◽  
pp. 012017
Author(s):  
Shengqing Li ◽  
Na Deng ◽  
Jian Zheng ◽  
Jiaxing Yu
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
System Stability ◽  
Closed Loop Control ◽  
Static Error ◽  
Loop Control ◽  
Phase Inverter ◽  
Suppression Effect ◽  
Three Phase ◽  
Three Phase Inverter

Abstract The traditional proportional integral (PI) controller in photovoltaic three-phase inverter system has the problems of no static error tracking and poor resonance suppression effect. In order to improve the resonance suppression effect and current control effect of photovoltaic three-phase inverter system, a control strategy of photovoltaic three-phase inverter system based on PI and quasi proportional resonance (QPR) double closed-loop control is proposed. The control strategy and control block diagram based on PI and QPR double closed-loop control are designed to realize no static error tracking of incoming current, which has better waveform of incoming current and resonance suppression effect, and improves system stability. Finally, the effectiveness of the control strategy are verified by simulation.

High-Efficiency 312-kVA Three-Phase Inverter Using Parallel Connection of Silicon Carbide MOSFET Power Modules

2015 ◽  
Vol 51 (6) ◽  
pp. 4664-4676 ◽  
Author(s):  
Juan Colmenares ◽  
Dimosthenis Peftitsis ◽  
Jacek Rabkowski ◽  
Diane-Perle Sadik ◽  
Georg Tolstoy ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Efficiency ◽  
Parallel Connection ◽  
Phase Inverter ◽  
Power Modules ◽  
Three Phase ◽  
Three Phase Inverter

Suppression strategy for output unbalance of eight‐switch three‐phase inverter

2017 ◽  
Vol 53 (14) ◽  
pp. 951-953 ◽  
Author(s):  
Ming Zhang ◽  
Yuan‐bo Guo ◽  
Ze Li ◽  
Xiao‐hua Zhang
Keyword(s):  
Phase Inverter ◽  
Three Phase ◽  
Three Phase Inverter ◽  
Suppression Strategy
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