Design of Low Voltage Ride through Control Method for Power System with New Energy Photovoltaic Access

Hua Ye, Xinchen Lu, Li Lin, Wenbo Shi, Xinmiao Gong

Abstract


In order to address the issue of DC bus voltage instability caused by the slow dynamic response of low-voltage ride-through (LVRT) control in power systems integrated with renewable photovoltaic (PV) energy, this paper proposes an active power-based direct control strategy for enhanced LVRT performance. The strategy begins by analyzing the LVRT requirements for such systems and examines the typical two-stage grid-connected PV system topology. Depending on the severity of the grid voltage sag, it calculates the reference power for both AC and DC sides, and then directly and actively controls the PV array and inverter to output the corresponding reference power, thereby rapidly balancing power on both sides. Experimental results show that under the proposed control method, when the grid voltage drops to 0.85 per unit (pu), the output power of the PV array is maintained at approximately 0.625 pu, demonstrating that the PV system can remain connected to the grid during voltage dips while providing reactive power compensation to help restore the grid voltage. This achieves effective LVRT control with improved dynamic performance.

Keywords


Grid connected operation; Low voltage ride through; Model predictive control; New energy photovoltaic access; Power limiting control

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References


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DOI: https://doi.org/10.64289/iej.25.0412.4858769