Static voltage stability margin evaluation method and system, and terminal device

A static voltage stability margin evaluation method, comprising:

• establishing a thermal dynamic model of a heating system based on temperature transmission of a heating network pipe and thermal dynamics of a building;
• establishing a thermoelectric coupling device model based on operation and a coupling constraint of a thermoelectric coupling device;
• establishing, based on an electric load growth mode and a thermal load growth mode, a static voltage stability margin model:
• max(λE,λH)
• s.t. gE(P,Q,V,θ,λE)≤0
• gH(H,T,m,λH)≤0
• gEH(P,H)≤0
• wherein λE and λH are respectively an electric load coefficient and a thermal load coefficient;
• P and Q are respectively active/reactive power of an electric generator or a branch;
• V and θ are respectively a voltage and a phase of a bus;
• H is thermal energy;
• T is a water temperature or a room temperature;
• m is a mass flow rate;
• and gE(⋅)≤0, gH(⋅)≤0, and gEH(⋅)≤0 are respectively constraints of an electric power system, the heating system, and a thermoelectric coupling relationship;
• and
• solving the static voltage stability margin model to obtain a voltage stability margin.