A Grid Voltage Stability Monitoring Method Based on Node Voltage Stability Index Considering Static Load Characteristics

The invention discloses a network voltage stability monitoring method based on node voltage stability indexes taking account of the static load characteristic. A method for building the voltage stability local index according to existence conditions of real root solutions of a quadratic equation and determinant of an expansive Jacobian matrix is abandoned, the voltage stability local index taking account of the ZIP static load influence is built according to the voltage and the critical load level factor of a solving system at a saddle-node bifurcation point, and the voltage stability local index accurately reflects the influence on the system voltage stability from load voltage characteristics; in consideration of the problems such as the selection sensitivity of the convergence of the local Newton method on the initial value and the rate of convergence, a system of nonlinear equations in the process of solving the critical load level factor is solved according to the global convergence and a self-adaption optimal iterative step length NLEQ-RES method, and the convergence and the rate of convergence of numerical calculation are improved when the system of nonlinear equations is solved.