The Repetitive Control for Dynamic Voltage Restorer

2012 ◽  
Vol 546-547 ◽  
pp. 833-839 ◽  
Author(s):  
Zhe Li ◽  
Zheng Guo Wu ◽  
Li Xia ◽  
Wei Ping Zhou
Keyword(s):  
Repetitive Control ◽  
Voltage Regulation ◽  
Dynamic Voltage Restorer ◽  
Integral Control ◽  
Control Approach ◽  
Proportional Integral ◽  
Voltage Restorer ◽  
Control Scheme ◽  
Dynamic Voltage ◽  
Proportional Integral Control

A novel control scheme for the dynamic voltage restorer (DVR) is proposed to achieve fast response and effective sag and swell compensation capabilities. In this control scheme, the proportional integral control is used to guarantee system dynamic performance and the repetitive control is used to improve voltage waveform quality. Compared to classical proportional integral control, DVR based on this control scheme can restore load voltage almost sinusoidal and shows better transient and steady-state responses when facing sag or swell conditions. The proposed control scheme has been verified by simulation on Matlab. Simulation results show that the control approach performs very effectively and yields excellent voltage regulation.

Design of Z-Source Inverter-Based Dynamic Voltage Restorer Circuitry with R-SOGI Control Scheme for Enrichment of Power Quality

2021 ◽  
pp. 2150195
Author(s):  
A. Sathik Basha ◽  
M. Ramasamy
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Voltage Sag ◽  
Nonlinear Loads ◽  
Dynamic Voltage Restorer ◽  
Power Distribution System ◽  
Voltage Restorer ◽  
Control Scheme ◽  
Dynamic Voltage

Increased utilization of nonlinear loads in the power distribution system with profound integration of renewable energy requires improved power quality control. This paper proposes a Reformed Second Order Generalized Integrated (R-SOGI) control scheme for enhancing the output of the Dynamic Voltage Restorer (DVR) for the objective of achieving the desired sinusoidal voltage wave shape at the common point of services and harmonic reduction. The DVR incorporates a Solar Photovoltaic (SPV) system using the Z-source Inverter (ZSI), providing the necessary active power to mitigate the voltage sag/swell and power demand. ZSI offers step-down as well as step-up abilities, it makes the converters to operate in the conditions of shoot-through. Therefore, the application of ZSI-based DVR topology seems very promising. The compensating reference voltage is generated by the R-SOGI algorithm, which offers superior output under conditions for grid voltage irregularities, including voltage sag/swell and unbalanced and distorted utility grid voltages. In comparison to DVR based on the VSI voltage inverter (VSI), the response from ZSI-DVR to a reduction of voltage distortions and harmonics is investigated. An experimental SPV ZSI-DVR prototype is developed in the laboratory to check the effectiveness of the controller and is tested under balanced and unbalanced supply and dynamic load conditions.

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