Intelligent joining-cutting method for large electrified wire netting equipment overloading on-line sensitiveness

Abstract

An intelligent intertripping method of the power pool device overload online sensitivity is provided, wherein a generator and a load in the power system are used as the node injection current; the node voltage equation of the network is I[N]=Y[N]U[N]; the linear coefficient matrix between the branch current and the node injection current are called as the correlation degree coefficient matrix of the network as C (lambda), and lambda <ki> shows the element in the matrix, and the expression is C(lambda)=YA[T]Y[N-1]. The optimal cutting machine, and the cutting load control point are selected according to the corresponding rank of C (lambda). The invention can reflect the physical condition of the system according to the fact, the scheme to look for the optimal cutting machine, and the cutting load control point is simple, the computing speed is fast, which can be applied in the online computation of the electric network operation load control.

Description

technical field [0001] The invention belongs to the field of power grid control, and more precisely, the invention relates to a method for intelligent machine-cutting / load-shedding selection of large power grid equipment overload online sensitivity calculation. Background technique [0002] Literature 1 "A New Power Sensitivity Method of Ranking Branch Outage Contingencies for Voltage Collapse" (IEEE Trans, 2002) ranks fault branch outage contingentities according to power, and identifies branch outages that have an impact on voltage collapse. road. According to the sensitivity, quickly eliminate serious faults to prevent voltage collapse. The main problem with this method is that it does not consider the reactive power characteristic constraints of the load. The modern power system is a complex nonlinear time-varying system, and the input of new power electronic equipment introduces various uncertain factors. The sensitivity index without considering constraints cannot fu...

AI Technical Summary

Problems solved by technology

The main problem with this method is that it does not consider the reactive power characteristic constraints of the load

The modern power system is a complex nonlinear time-varying system, and the input of new power electronic equipment introduces various uncertain factors. The sensitivity index without considering constraints cannot fully reflect the physical conditions of the actual power grid.

[0003] Document 2 "Sensitivity for power system steady-state control" (IEE Proc-Gener, Transm, and Distrib, 1997) introduces the second-order sensitivity derived from the second-order expansion of Taylor series Calculation method, but the formula is complicated and the amount of calculation is huge, so it cannot be used for online analysis

[0004] The literature "Introduction to System Sensitivity Theory" and "Static Safety Analysis of Power System" all give different sensitivity mathematical models and calculation methods, lacking a unified theoretical basis, and need to consider feasible simplified algorithms in the field of engineering applications