Control of variable power low voltage ride-through and imbalance under abnormal voltage conditions in grid-tied photovoltaic inverters

Under abnormal grid conditions, grid‑tied photovoltaic (PV) inverters run into big problems: transient stability issues, DC‑bus overvoltage, and AC overcurrent when the voltage fault is unbalanced. This project introduces an improved fault‑ride‑through (FRT) control strategy to tackle those problems. The method changes the PV array’s power‑tracking path so the inverter can lower its generation on the fly. That prevents DC‑link overvoltage and keeps power balanced across the inverter stages. To fix grid‑current imbalances, a current‑reference generator is added to a dual‑sequence (positive‑ and negative‑sequence) current inner‑loop controller. This combination calculates exact current commands, ensuring the grid currents stay balanced and the power injection remains stable. A clear mathematical relationship is

also derived between the power‑reference setpoint and the peak‑current limit. This gives systematic guidance for setting inverter power limits during unbalanced grid faults. Real‑time simulations confirm the strategy works: it improves transient support, reduces current distortion, and provides strong low‑voltage ride‑through capability. The framework gives M.Tech students a complete guide for implementing and researching advanced power‑electronics control under grid disturbances.

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