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Process for real time recognizing voltage stability of electrified wire netting trough recognizing weak links of electric network

A voltage stability, weak link technology, applied in the direction of measuring current/voltage, phase angle between voltage and current, measuring resistance/reactance/impedance, etc. , inaccuracy, etc.

Inactive Publication Date: 2008-02-06
CHONGQING UNIV
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Problems solved by technology

If the two system states are too far apart, this assumption is obviously not valid; on the contrary, if they are too close, it may cause a large calculation error when estimating Thevenin equivalent impedance, this shortcoming leads to its practical Difficulty and imprecision in application
[0012] · The proposed method cannot identify any erroneous or invalid measurement data
Indicators are useless and meaningless if any voltage or current measurements are incorrect or have large errors
However, in any measurement system, it is impossible to completely avoid the situation of invalid measurement data
[0013] Although these indicators can identify weak nodes, they cannot identify weak grid lines that cause system voltage collapse
[0014] ·This method cannot be applied to the SCADA measurement data collection system and EMS energy management system of the existing control center

Method used

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  • Process for real time recognizing voltage stability of electrified wire netting trough recognizing weak links of electric network
  • Process for real time recognizing voltage stability of electrified wire netting trough recognizing weak links of electric network
  • Process for real time recognizing voltage stability of electrified wire netting trough recognizing weak links of electric network

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Embodiment approach

[0069] A method for real-time identification of grid voltage stability by identifying weak links in the grid. The method obtains the real-time measurement of the voltage phasor and the line complex power of the nodes (i, j) at both ends of the line through the PMU phasor measurement system, and filters out the invalid measurement to estimate the line parameters in real time. Calculate the basic line voltage stability index BLSI in real time by using the filtered reliable quantity measurement and real-time estimated value of line parameters; or obtain the online line voltage through the state estimation function of the SCADA measurement data collection system and the EMS energy management system Calculate the basic line voltage stability index BLSI online based on the estimated value of the voltage phasor of the nodes at both ends and the line complex power; Identify and judge the weak links and voltage stability of the power system. In the present invention, the voltage stabi...

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Abstract

The present invention relates to a method of identifying the voltage stability of power grid in real time via figuring out the weak links of power grid; and uses a basic line voltage stability index BLSI or an extended line voltage stability index ELSI which is improved on the basis of the BLSI index to monitor, identify and judge power grid. The steps of identifying are as follows. Firstly, the requisite real-time date can be obtained via a PMU system or SCADA and EMS; Secondly, useless measurements get filtrated; thirdly, the parameters of the line are reassessed in real time if necessary in a given time interval; fourthly, a BLSI index or ELSI index is used to identify the weak links of the system; lastly, the system emergency protection control is started up to avoid the breakdown of system voltage at the BLSI value or ELSI value which is the weakest link that leads to voltage breakdown. The present invention has the advantages of identifying voltage invariability of the system in real time and weak lines and weak links that cause voltage breakdown of the system; and automatically dealing with actual loading properties relevant to voltage or frequency.

Description

technical field [0001] The invention relates to a method for identifying and judging the voltage stability of a power system (grid), in particular to a real-time quantity measurement or state estimation of the voltage and current (or power) phasors at both ends of the line to identify and judge the power in real time. method for voltage stability of the system. Background technique [0002] Voltage stability has long been a matter of great concern to power companies. In recent years, voltage instability accidents have occurred in different power systems all over the world, and have caused major blackouts in the system. Therefore, the voltage stability problem has become one of the hot spots at home and abroad. So far, a lot of research has been done on voltage stability evaluation methods, but most of the methods can only be applied to off-line calculations [1-16] (Note: In the process of developing the present invention, the inventor has conducted a large number of Retrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/00G01R19/06G01R21/00G01R21/01G01R25/00G01R25/02G01R27/02G01R27/04
CPCY02E60/728Y04S10/265
Inventor 李文沅余娟汪洋保罗·乔杜里孙军颜伟
Owner CHONGQING UNIV
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