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

A sensitive and large-scale power grid technology, applied to electrical components, emergency protection circuit devices, single-network parallel feeding arrangements, etc., can solve problems such as complex formulas, large calculations, and inability to fully reflect the physical conditions of the power grid, and achieve a simple and clear plan , the effect of fast calculation speed

Inactive Publication Date: 2008-11-05
JIANGSU ELECTRIC POWER CO
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  • Abstract
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  • Application Information

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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 th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0049] Example 2: Jiangsu Subei Combined Cutting Machine System

[0050] In fact, the application of machine cutting system and load shedding system is similar, but the correlation direction is opposite.

[0051] The fault causes the line to be overloaded, and the master station device performs machine cut-off control according to the fixed value (that is, the cut-off sequence) in the cut-off sequence table of the overloaded line, and only cuts one unit in each round.

[0052] Sequence table of overload line cutting machine

[0053] Preface

[0054] Thanks to the fast sensitivity calculation method of the present invention, the on-line calculation can be realized to update the cut-off sequence table of the overloaded line, and the optimization of cut-off stations and wheel stages can be realized. If the overload does not disappear after one judgment action, the loop will end until the overload phenomenon disappears.

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/22H02J3/38
Inventor 刘华伟李碧君朱寰杨卫东李海峰鲍颜红王小英
Owner JIANGSU ELECTRIC POWER CO
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