Method and system for analyzing applicability boundary of low-voltage alternating-current and direct-current network frame

The invention discloses a low-voltage AC/DC network frame applicability boundary analysis method and system, and relates to the technical field of AC/DC power distribution networks, and the method comprises the steps: determining a regulation and control mode of FVR equipment based on load flow calculation under an original AC transformer area scene; according to the initial power flow calculation, if the voltage out-of-limit problem does not occur in the current transformer area, the FVR equipment is set to work in a power flow optimization mode; if the voltage out-of-limit problem occurs, the FVR equipment is set to work in a voltage regulation mode, and the mode is determined by calculating the voltage at the tail end of the transformer area; and respectively substituting the optimized VSC regulation and control quantity and the node photovoltaic reactive power optimization quantity into the AC/DC and AC load flow calculation models, and calculating a final economic index value. According to the method, th