Grid voltage stabilization on-line monitoring method based on voltage stability local indexes

Abstract

The invention provides a grid voltage stabilization on-line monitoring method based on voltage stability local indexes, comprising the following steps: calculating single power consumption transmission equivalence system parameters of a monitored node according to grid topology structure parameters and relevant node voltage current phasor in adjacent areas of the monitored node; using the single power consumption transmission equivalence system parameters to identify the influence of a system outside the area on the monitored node to obtain a single power consumption transmission equivalence system expanded by the monitored node; calculating voltage stability local indexes of the monitored node according to the expanded single power consumption transmission equivalence system parameters; judging whether the monitored node is a weak node according to the node voltage stability local indexes; and if so, performing voltage stability warning. The identified initial value is the calculatedsingle power consumption transmission equivalence system parameter. The invention can solve the problem of misjudgment of index values generated by incorrect identified parameters when the continuousexcitation condition is not satisfied; the method has fine index value performance, can judge the weak node correctly, and realize on-line monitoring of the grid voltage stability.

Description

technical field [0001] The invention relates to an on-line monitoring method of power grid voltage stability based on a local index of voltage stability. Background technique [0002] Power system voltage instability may lead to large-scale power outages, resulting in huge economic losses and seriously affecting social life. The grid voltage stability monitoring method based on local voltage stability indicators based on wide-area measurement only uses relevant measurement information to directly calculate local indicators of voltage stability and voltage stability without power flow calculations, which reduces the amount of network calculations and can be applied online Grid voltage stability monitoring is of great significance to ensure the safe and stable operation of the power system. [0003] The online monitoring method of grid voltage stability based on local voltage stability indicators usually first determines the equivalent system parameters of single power supply...

AI Technical Summary

Problems solved by technology

This method can accurately deal with the time-varying characteristics of the actual load, and is not affected by the characteristics of the line load voltage load; it solves the problem of misjudgment of the index value caused by inaccurate identification parameters when the continuous excitation condition is not satisfied; the index value performance is good, Can accurately determine weak nodes, so as to realize effective online real-time monitoring of grid voltage stability

Images