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Transient state and medium and long-term voltage stability distinguishing method based on power current reversal

A technology of voltage stability and discrimination method, which is applied in the field of power system, can solve the problems of inability to guarantee the accuracy of judgment results and lack of theoretical support, etc., and achieve the effect of small calculation, simple use and strong adaptability

Active Publication Date: 2010-01-20
CHINA ELECTRIC POWER RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, how to accurately judge the transient state after the power system disturbance and the voltage stability in the medium and long-term process is still a difficult problem to be solved. The existing practical method is a kind of Expedient method, lack of theoretical support, and cannot guarantee the accuracy of judgment results

Method used

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  • Transient state and medium and long-term voltage stability distinguishing method based on power current reversal
  • Transient state and medium and long-term voltage stability distinguishing method based on power current reversal
  • Transient state and medium and long-term voltage stability distinguishing method based on power current reversal

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Embodiment Construction

[0024] The following is an implementation example of the present invention: take a 3-machine 10-node system for simulation calculation as an example. Further explanation is as follows:

[0025] The structure of the 3-machine 10-node system is as follows: figure 1 shown. The transient and mid-to-long-term voltage stability discrimination method based on power and current reversal specifically includes the following steps:

[0026] 1) Obtain (monitor) the current effective value, apparent power or active power of the load in advance.

[0027] In this embodiment, Bus10 is selected for verification, and the load current effective value, load apparent power and active power at each transient stability simulation calculation step at Bus10 can be easily obtained by using the transient stability simulation program.

[0028] 2) After the disturbance starts, use the formula (3) or formula (4) to judge the load current effective value, apparent power and active power collected at Bus1...

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Abstract

The invention provides a method for judging whether voltage has unstability in the transient state and medium and long-term process after an electrical power system has disturbance; if load current or current on a sending and receiving end connecting line is increased to lead a load or a receiving end system not to obtain higher power, and after the situation lasts for a period of time, the voltage of a load bus or a connecting line receiving end bus is lowered to be lower than a certain threshold value, so voltage of the load bus or the receiving end system has unstability. The method overcomes the defect that the existing method is lack of theory support and solves the problem that the accuracy of the judgment result can not be determined; the method has the characteristics of strong applicability, simple use and little calculated amount, and can be applied to the estimation and judgment for the transient state and medium and long-term voltage stability in the electrical power system.

Description

technical field [0001] The invention relates to a method for judging transient state and medium- and long-term voltage stability based on power and current reversal, and belongs to the field of power systems. Background technique [0002] At present, how to accurately judge the transient state after the power system disturbance and the voltage stability in the medium and long-term process is still a difficult problem to be solved. The existing practical method is a kind of The expedient method lacks theoretical support and cannot guarantee the accuracy of the judgment results. [0003] For example, the criteria commonly used in my country's power system are as follows: the instability criterion of voltage stability can be judged according to the voltage drop range and duration of the busbar voltage at the central point of the voltage, that is, the busbar voltage at the central point of the system voltage in the dynamic process If the drop continues (usually 1 second) below t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G01R31/00
Inventor 汤涌易俊孙华东
Owner CHINA ELECTRIC POWER RES INST
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