A ROBUST CONTROL STRATEGY TO IMPROVE LOW VOLTAGE RIDE-THROUGH OF A GRID-CONNECTED PHOTOVOLTAIC SYSTEM

The control strategy based on predictive current is proposed to solve problems that destruct stable operation of grid-connected photovoltaic system during asymmetrical fall. A mathematical model of PV inverter is established to calculate current instruction; a method of tracking based on predictive current is proposed to reduce the fluctuations of 2 times frequency. In the meantime, PV inverter provides reactive power to support voltage recovery according to the depth of grid voltage sags and realize LVRT. The result also shows that the proposed control strategy can reduce wave of DC voltage and provide reactive power to support voltage recovery.

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Grid-Connected Photovoltaic System Based on Tapped-Inductor Quasi-Z-Source Inverter and Its Low Voltage Ride-Through Control Strategy

2018 China International Conference on Electricity Distribution (CICED) ◽

10.1109/ciced.2018.8592378 ◽

2018 ◽

Author(s):

Sun Bo ◽

Zhao Chengbin ◽

Zhang Hua ◽

Xie Bangpeng ◽

Xu Chengji ◽

...

Keyword(s):

Control Strategy ◽

Low Voltage ◽

Photovoltaic System ◽

Low Voltage Ride Through

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Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v9i3.pp1524-1530 ◽

2019 ◽

Vol 9 (3) ◽

pp. 1524

Author(s):

Haval Sardar Kamil ◽

Dalila Mat Said ◽

Mohd Wazir Mustafa ◽

Mohammad Reza Miveh ◽

Nasarudin Ahmad

Keyword(s):

Control Strategy ◽

Power Plants ◽

Low Voltage ◽

Photovoltaic System ◽

Electrical Grid ◽

Low Voltage Ride Through ◽

Power Stations ◽

Pv Inverter ◽

Synchronous Reference Frame ◽

Three Phase

With the innovative progresses in power electronics in recent years, photovoltaic (PV) systems emerged as one of the promising sources for electricity generation at the distribution network. Nonetheless, connection of PV power plants to the utility grid under abnormal conditions has become a significant issue and novel grid codes should be recommend. The low-voltage ride-through (LVRT) capability is one of the challenges faced by the integration of PV power stations into electrical grid under abnormal conditions. This work firstly provides a discussion on recent control schemes for PV power plants to enhance the LVRT capabilities. Next, a control scheme for a three-phase four-leg grid-connected PV inverter under unbalanced grid fault conditions using synchronous reference frame proportional integral (SRFPI) controller is proposed. Simulation studies are performed to investigate the influence of the control strategy on the PV inverter.

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Strategy for Reactive Control in Symmetrical Low Voltage Ride through of Photovoltaic System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.2820 ◽

2014 ◽

Vol 602-605 ◽

pp. 2820-2823

Author(s):

Ju Bo Wang ◽

Wen Li Xu ◽

Wei Bao ◽

Pan Zhang

Keyword(s):

Control Strategy ◽

Reactive Power ◽

Low Voltage ◽

Photovoltaic System ◽

Reactive Control ◽

Low Voltage Ride Through ◽

Power Decoupling ◽

Simulation And Experiment ◽

System Output ◽

New Type

The active and reactive power decoupling control of photovoltaic system is analyzed in this paper. The DC-DC and DC-AC two level photovoltaic inverter model are built on the RTDS. A new type LVRT control strategy about photovoltaic system is proposed. In the symmetrical grid drop fault case, photovoltaic system output reactive power to support the grid voltage recovering and save reactive power equipment. The feasibility and effectiveness of the control strategy is verified by simulation and experiment on the RTDS.

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