Control Strategy of Low Voltage Ride-Through for Grid-Connected Photovoltaic Power System Based on Predictive Current

Abstract:

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.

• Periodical: Applied Mechanics and Materials (Volumes 556-562)
• Pages: 1753-1756
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.556-562.1753
• Online since: May 2014
• Authors: Ming Guang Zhang*, Xiao Jing Chen
• Keywords: Asymmetrical Fall, Grid-Connected Photovoltaic System, LVRT, Predictive Current, PV Inverter

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