Abstract
Based on the bipolar photovoltaic grid-connected inverter control system, a grid unbalanced fault ride-through control strategy is proposed to support the stable operation of the bipolar photovoltaic grid-connected system. Based on analyzing the operating state of the photovoltaic system when unbalanced voltage sags, a voltage fault ride-through control logic of the bipolar photovoltaic system is proposed to solve the problem of grid-connected current quality during fault. The correctness and usage scenarios of the method are verified by Matlab/Simulink simulation. The results show that for different unbalanced voltage sags, the control method can effectively suppress the grid-connected negative sequence current under the condition of low-voltage sag depth, and keep the grid-connected current within a safe current range.
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The authors gratefully acknowledge the support of the National Science Foundation of China (52007194).
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Hu, Y., Xia, Y., Liu, X., Zhao, P., Du, S., Su, J. (2022). Performance Investigation of Grid-Connected PV System with Dual Current Control Under Unbalanced Voltage Sags. In: Fan, W., Zhang, L., Li, N., Song, X. (eds) Methods and Applications for Modeling and Simulation of Complex Systems. AsiaSim 2022. Communications in Computer and Information Science, vol 1713. Springer, Singapore. https://doi.org/10.1007/978-981-19-9195-0_32
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DOI: https://doi.org/10.1007/978-981-19-9195-0_32
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