Lihua Li, Hong Zhou, F. Luo, Xiangyang Lin, Yang Han
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Control Strategy for Low Voltage Ride Through (LVRT) Operation of Two-Stage Photovoltaic Power Generation System
This paper presents an improved low voltage ride through (LVRT) control strategy for the two-stage photovoltaic (PV) power generation system by adding discharging circuit at the DC-link of the inverter and modifying the active and reactive current reference to the DC/AC inverter when grid voltage sag occurs. The 500kVA two-stage photovoltaic power system model is built in PSCAD/EMTDC platform, which consists of PV arrays, Boost converter and 3-phase DC/AC inverter. The maximum power point tracking (MPPT) control scheme is adopted in the Boost converter, and the dual-loop control structure is utilized for the DC/AC inverter, where the outer voltage loop is used for maintaining DC-link voltage, and the inner current loop is used for improving dynamic response for current tracking. Also, a separate DC voltage loop is adopted in the discharging circuit for the LVRT operation. Simulation in PSCAD/EMTDC platform verifies the validity of the proposed control strategies under symmetrical voltage sag conditions
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