Full Frequency Range Harmonic Suppression Strategy of Grid-connected Inverter Based on Feedforward of Grid Voltage

2020 ◽  
Author(s):  
Ming Yang ◽  
Wu Cao ◽  
Jianfeng Zhao
Keyword(s):  
Harmonic Suppression ◽  
Frequency Range ◽  
Grid Voltage ◽  
Grid Connected Inverter ◽  
Suppression Strategy

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 A novel current controller design for grid-integrated PV inverter system

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Ayaz Ahmad ◽  
L. Rajaji ◽  
A. Iqbal
Keyword(s):  
Controller Design ◽  
Vital Role ◽  
Current Feedback ◽  
Lcl Filter ◽  
Design Algorithm ◽  
Grid Voltage ◽  
Pv Inverter ◽  
Current Controller ◽  
Experimental Implementation ◽  
Grid Connected Inverter

AbstractDistributed generators are playing a vital role in supporting the grid in ever-increasing energy demands. Grid code regulation must be followed when integrating the photovoltaic inverter system to the grid. The paper investigates and analyzes a controller model for grid-connected PV inverters to inject sinusoidal current to the grid with minimum distortion. To achieve better tracking and disturbance rejection, a DSP-based current controller is designed with LCL filter. The controller gets the current feedback from the grid, compares it with reference current, and calculates duty cycle to generate PWM pulses to trigger H-bridge converters. The grid voltage is loaded to the initial value in proposed PR controller to ensure the initial inverter voltage to match the grid voltage. The paper presents a novel current controller algorithm for grid-connected inverter system, and simulation is done. A detailed analysis has been carried out to validate the proposed design algorithm. Experimental implementation of the current controller in the DC/AC converter circuits with an LCL filter is done for 5.4 kW to validate and match the simulation model.

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

Power Feedward Strategy of Grid-Connected Inverter Based on Direct Power Decoupling

2013 ◽  
Vol 331 ◽  
pp. 311-314
Author(s):  
Chun Peng Fu ◽  
Yong Qiang Zhu
Keyword(s):  
Output Power ◽  
Mathematic Model ◽  
Direct Power ◽  
Loop Control ◽  
Grid Voltage ◽  
Voltage Change ◽  
Power Decoupling ◽  
Grid Connected Inverter ◽  
The Relationship ◽  
Power Response

Take into account grid inverter that using direct power control is vulnerable to the disturbance of grid voltage, a control algorithm is proposed based on the relationship between the power and voltage, which is deduced according to the mathematic model of the inverter that using double-loop control strategy. The change amount of the output power of inverter is added to the reference of power closed-loop as power feedforward, which improves the dynamic response to the grid voltage change. Simulations with EMTDC/PSCAD are carried out and the comparison of output power response to grid voltage change between control with and without power feedforward verifies its effectiveness.

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