Asymmetric Voltage Sag Control Strategy for Grid-Connected PV System Based on PIR Controller

Abstract:

This paper proposes an improved LVRT control strategy based on PIR controller for grid-connected photovoltaic system under asymmetric voltage sag fault. First, the PIR current controller is designed in the positive synchronous frame without the need to decompose the positive and negative sequence components and the dynamic adjustment method for the current-reference calculation is given in order to gain a constant active power. And then, the principle how control strategies switching between the one in normal state and the other one in fault state is revealed in detail. Finally, simulations and experiment test on a 500kVA grid-connected photovoltaic inverter verify that this control strategy achieves good dynamic performance and it improves the PV inverters’ capacity of riding through asymmetric voltage sag fault effectively.

• Periodical: Advanced Materials Research (Volumes 724-725)
• Pages: 128-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.724-725.128
• Online since: August 2013
• Authors: Fei Zheng, Xiao Lin Zhang, Ming Chang Ding
• Keywords: Asymmetric Voltage Sag, Control Strategy Switching Method, Dynamic Adjustment Method, Grid-Connected Photovoltaic System, PIR Controller

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