Direction Judgment Method of Voltage Sag Source Based on Sequence Space Vector Characteristic Impedance Real Part Polarity

A technology of characteristic impedance and voltage sag, applied in the direction of fault location, etc., can solve the problem of low accuracy of voltage sag location

Active Publication Date: 2018-03-09
CHINA UNIV OF MINING & TECH +2
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Problems solved by technology

These positioning methods have a relatively high accuracy rate for voltage sags caused by symmetrical faults, but low accuracy for voltage sags caused by asymmetrical faults, and are only suitable for single-circuit radial grids.

Method used

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  • Direction Judgment Method of Voltage Sag Source Based on Sequence Space Vector Characteristic Impedance Real Part Polarity
  • Direction Judgment Method of Voltage Sag Source Based on Sequence Space Vector Characteristic Impedance Real Part Polarity
  • Direction Judgment Method of Voltage Sag Source Based on Sequence Space Vector Characteristic Impedance Real Part Polarity

Examples

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Embodiment 1

[0044] Example 1: First, "determine" an active current reference direction at the monitoring point, and this "determined" active current reference direction is "determined" by the current of the monitoring device at the monitoring point and the polarity of the voltage transformer (terminal with the same name) , generally "stipulation" that the active power consumed by the primary load is the positive reference direction of the active current, which has nothing to do with the flow direction of the actual primary active current at the monitoring point; then according to the linear active single-port network theory, by measuring the sequence space of the active single-port network The polarity of the real part of the vector characteristic impedance is used to accurately determine the direction of the source of the voltage sag; when the polarity of the real part of the sequence space vector characteristic impedance is positive, the disturbance source is upstream of the monitoring po...

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Abstract

The invention discloses a method for judging the direction of the voltage sag source based on the polarity of the real part of the sequence space vector characteristic impedance. The polarity of the real part of the sequence space vector characteristic impedance of the source single-port network is used to accurately determine the direction of the source of the voltage sag; when the real part polarity of the sequence space vector characteristic impedance is positive, the disturbance source is upstream of the monitoring point; the sequence space When the polarity of the real part of the vector characteristic impedance is negative, the disturbance source is downstream of the monitoring point; the method for judging the direction of the voltage sag source proposed by the present invention can determine with certainty the source of the voltage sag caused by various grid faults, It is applicable to any grid structure power grid, effectively grounded neutral point and non-effectively grounded power grid, and is also suitable for the location of disturbance sources.

Description

technical field [0001] The invention relates to an automatic monitoring and positioning method for a pollution source affecting the power quality of a grid power supply, in particular to an automatic monitoring and positioning method for locating a grid voltage sag source. Background technique [0002] Voltage sag refers to a phenomenon in which the root mean square value of the supply voltage suddenly drops to 90%~10% of the rated voltage amplitude in a short period of time, and its typical duration is 10ms~1min. Some highly automated equipment is easily affected by voltage sags, and several cycles of voltage sags will cause huge economic losses to industrial production. According to foreign surveys, voltage sags have become the main cause of complaints in power quality problems, and even account for 80% of complaints. However, electric energy is a special product that is provided by the power sector to power users and whose quality is jointly guaranteed by both the power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 唐轶时昀陈奎刘昊倪冰
Owner CHINA UNIV OF MINING & TECH
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