String complement capacitance transmission line distance protecting method based on model recognition

A technology of model recognition and distance protection, which is applied in the direction of emergency protection circuit devices and electrical components, can solve the problems of destroying the linear relationship between transmission line impedance and distance, low protection sensitivity, etc., and achieve the goal of overcoming the influence of distance protection and improving sensitivity Effect

Active Publication Date: 2009-12-30
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0003] However, the series compensation capacitor destroys the linear relationship between the impedance of the transmission line and the distance. When the traditional distance protection is applied to the series compensation line, the capacitive reactance Z of the series compensation capacitor must be considered. C , according to the whole line impedance Z L Adjust Z with the sum of the capacitive reactance of the series compensation capacitor Zd =(0.8~0.9)(Z L +Z C ), when the capacitive reactance of the series compensation capacitor is large, the protection sensitivity is very low

Method used

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  • String complement capacitance transmission line distance protecting method based on model recognition
  • String complement capacitance transmission line distance protecting method based on model recognition
  • String complement capacitance transmission line distance protecting method based on model recognition

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Embodiment Construction

[0021] refer to figure 1 , a protection device is installed at the end of the line M, the protection device measures the three-phase voltage and current at the end of the line M through the voltage transformer TV and the current transformer TA, and passes the analog measurement value through a low-pass filter, a sample-and-hold device and an A / D After the converter, it is sent to the microcomputer processor (DSP), and the microcomputer processor transmits the judgment result to the relay through the photoelectric isolator, and executes the corresponding protection action.

[0022] refer to figure 2 , which is the fault model diagram before the series compensation capacitor, for a single-phase (take A-phase as an example) ground fault equation u Am = R ( i Am + k R i ...

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Abstract

The invention relates to the field of distance protection research for power transmission line with series compensation capacitor, in particular to a series compensation capacitor power transmission line distance protection method based on model identification. In the method, model identification technology is adopted, a front fault model before the series compensation capacitor is built up, the sampled current and voltage values at the protected site are input into the model for parameters estimation, and at last the error coefficient EF is worked out; the position of the fault point relative to the series compensation capacitor can be determined according to the relationship between the error coefficient and the fixed value, and the fault within the protection range can be detected with the cooperation of an impedance element; in this way the motion of the protection device can be controlled. The method can tell the position of single phase grounding fault point in a series compensation line relative to the series compensation capacitor; combined with the impedance element, the method can eliminate the influence on distance protection from the series compensation capacitor and can improve the sensitivity of the protection device.

Description

technical field [0001] The invention relates to the research field of distance protection of series-compensated lines, and more particularly relates to a method for distance protection of transmission lines with series-compensated capacitors based on model recognition. Background technique [0002] Series capacitance compensation is an effective means to improve the economy and reliability of transmission lines. Its main functions are: to improve the transmission capacity of the power system by controlling the flow; to improve the stability of the power system; to improve the voltage quality and reactive power balance; Line loss, improve line transmission capacity. It also has the function of improving the transient stability of the system, optimizing the power flow of the transmission line and reducing the loss of the system. [0003] However, the series compensation capacitor destroys the linear relationship between the impedance of the transmission line and the distance....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 索南加乐顾嘉粟小华张健康
Owner XI AN JIAOTONG UNIV
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