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Method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin

A technology of static voltage stability and static power angle, applied in the field of electric power system, can solve the problem that the full-step power coefficient of multi-machine system cannot be calculated

Inactive Publication Date: 2014-11-05
刘光晔
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Problems solved by technology

Since the power characteristic of a multi-machine system is a multi-variable function, it is theoretically impossible to obtain the full-step power coefficient of a multi-machine system

Method used

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  • Method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin
  • Method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin
  • Method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin

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Embodiment Construction

[0045] Step 1: The calculation method of dynamic equivalent impedance is as follows

[0046] In Cartesian coordinates, the power flow equation of the power system is

[0047] W = F ( U , U · n ) - - - ( 10 )

[0048] In the formula, is the balanced node voltage, and

[0049] W = P 1 S Q 1 S · · · ...

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Abstract

The invention provides a method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin, belonging to the field of a power system. Based on a power flow quotation, the dynamic characteristic of system power is considered to be injected, relatively comprehensive dynamic equivalence is carried out on the system, from a view of a PV node, the relatively comprehensive dynamic equivalence impedance of the system and the resistance margin index of the node are calculated, and according to the resistance margin index of the node, whether the quiescent voltage and the power angle of the system are subjected to instability is rapidly judged, or the stability degree of the power angle of the PV node is judged. During online application, the calculation of the resistance margin index is independent of the prior knowledge of a load mode in the system. The method can be applicable for online analysis control and offline simulation analysis of the power system, system running and scheduling persons can conveniently take effective measures, the stability level of the system is improved, system planning is facilitated, the scheduling persons can conveniently adopt a reasonable design and running scheme, and the comprehensive static stability level and the economy of system running are improved.

Description

technical field [0001] The invention relates to a power system stability analysis method, in particular to a method for comprehensively evaluating static voltage stability and power angle stability by using a resistance margin index, belonging to the field of power systems. technical background [0002] Power system static voltage stability and power angle stability are just two extreme cases of power system stability analysis. The simple system composed of 1 balance node and 1 PQ node only has the problem of voltage stability, the simple system composed of 1 balance node and 1 PV node only has the problem of power angle stability, and the limits of static voltage stability and power angle stability are both Find the limit value of the power system power flow. Although it has long been recognized that there is an inherent close relationship between static voltage stability and power angle stability in power systems, no practical index for comprehensive evaluation of voltage...

Claims

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Application Information

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IPC IPC(8): H02J3/12
Inventor 刘光晔
Owner 刘光晔
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