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Time synchronization method and system based on phase difference of voltage on both ends of line

A technology of time synchronization system and voltage phase difference, applied in the direction of fault location, etc., can solve the problem of low accuracy of fault analysis

Active Publication Date: 2015-11-18
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

[0004] Based on this, it is necessary to provide a time synchronization method and system based on the voltage phase difference at both ends of the line to improve the accuracy of fault analysis by synchronizing fault information to solve the problem of low fault analysis accuracy caused by fault information synchronization

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  • Time synchronization method and system based on phase difference of voltage on both ends of line
  • Time synchronization method and system based on phase difference of voltage on both ends of line
  • Time synchronization method and system based on phase difference of voltage on both ends of line

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Embodiment Construction

[0029] see figure 1 , providing an embodiment of a time synchronization method based on the voltage phase difference at both ends of the line, including the following steps:

[0030] S100: Obtain voltage waveforms at both ends of the faulty phase of the line when the fault occurs.

[0031] Since the existing power system generally uses three-phase power supply, the faulty phase refers to the faulty phase in the line, so when the power system fails, it may be a single-phase fault, or it may be a two-phase or multi-phase fault. Record the voltage waveform at both ends of each phase of the line in the power system. When a fault occurs, the voltage in the power system will change severely. If it is a single-phase fault, the voltage at both ends of the single-phase line will change severely. If there is a fault, the voltage at both ends of multiple phases of the line will change severely. According to the recorded voltage waveform of each phase, the voltage waveform at both ends o...

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Abstract

The invention relates to a time synchronization method and system based on a phase difference of voltage on both ends of a line. According to the method and the system, a phase difference of voltage waveforms on both ends of the faulted phase of a line at failure and that before failure are compared. It is manifested that the voltage waveforms on both ends of the faulted phase of the line at failure are not synchronous in time if the phase difference of the voltage waveforms on both ends of the faulted phase of the line at failure is not equal to that before the failure. The voltage waveforms on both ends of the faulted phase of the line at failure are adjusted in order that the time of the voltage waveforms on both ends of the faulted phase of the line at failure are synchronized. The method and the system provides reliable data for correct fault reason analysis, timely fault treatment, and protective system action correctness confirmation, may accurately analyzes the fault by using the voltage waveforms on both ends of the faulted phase of the line at failure so as to improve fault analysis accuracy.

Description

technical field [0001] The invention relates to the technical field of power system fault analysis, in particular to a time synchronization method and system based on the voltage phase difference between two ends of a line. Background technique [0002] With the development of substation automation, in order to ensure the safe and stable operation of the power system, the requirements for the management level and decision-making ability of relay protection, accident analysis and power grid operation are also getting higher and higher. Especially in the case of serious faults and complex faults in the high-voltage power grid, how to make the dispatching duty personnel and relay protection operation management personnel quickly and accurately understand the fault situation and the severity of the fault, scientifically analyze the cause of the fault, and take effective measures in time Reducing the scope of accidents and reducing the loss of failures is an urgent problem to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 焦邵麟黄明辉陈志光曾耿晖李一泉张智锐王峰刘刚赵纪元祁鸿燕杨东冯大鹏武雪利
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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