To address voltage stability issues caused by the integration of a high proportion of renewable energy into distribution networks
an online voltage control method for multi-converters based on the real-time measured short-circuit ratio (RMSCR) is proposed. First
using local measurements at a single time instant at the point of common coupling
the Thevenin equivalent parameters of the system are identified online via the least squares method. Analytical expressions for the RMSCR and its critical value are derived
enabling rapid assessment of voltage stability at the point of common coupling. Second
a coordinated active and reactive power optimization control strategy for converters based on RMSCR is designed. When the RMSCR falls below the stability threshold
priority is given to regulating reactive power output at voltage-weak nodes while maintaining maximum active power output within safety limits. Finally
the effectiveness of the proposed strategy is validated through simulations on the IEEE-33 bus distribution network. The results demonstrate that the method can accurately evaluate changes in system voltage support capability
optimize power allocation among converters in real time
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