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Voltage sag source positioning method

A technology of voltage sag source and positioning method, which is applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., and can solve the problem of high misjudgment rate of positioning methods

Active Publication Date: 2016-07-20
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The invention provides a method for locating voltage sag sources to solve the technical problem of high misjudgment rate in the locating methods for voltage sag sources in the prior art

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Embodiment Construction

[0046] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of means consistent with aspects of the invention as recited in the appended claims.

[0047] Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0048] Please refer to figure 1 , shows a flow chart of a method for locating a voltage sag source provided in an embodiment of the present invention.

[0049] Depend on figure 1 I...

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Abstract

The present invention provides a voltage sag source positioning method. The voltage sag source positioning method comprises: extracting the instantaneous active power and instantaneous reactive power reactive power variance [Delta]p(t) and [Delta]q(t) during the sag, performing integration obtaining of disturbance active energy [Delta]Ep(t) and reactive energy [Delta]Eq(t); determining whether the [Delta]Ep(t) and the [Delta]Eq(t) are the same number or not; if the [Delta]Ep(t) and the [Delta]Eq(t) are the same number, employing the symbol of the [Delta]Ep(t) to perform voltage sag source positioning; if the [Delta]Ep(t) and the [Delta]Eq(t) are not the same number, determining whether the voltage sag source is a symmetry fault or not; if the voltage sag source is a symmetry fault, employing an equivalent impedance real part positioning method to perform voltage sag source positioning; and if the voltage sag source is not the symmetry fault, calculating a three-phase sag degree similarity P3, and positioning the voltage sag source according to the P3 value. Through integration of three voltage sag source positioning method, the voltage sag source positioning method takes advantages of each voltage sag source positioning method so as to effectively reduce the misjudgment rate of the voltage sag source positioning and improve the reliability of the voltage sag source positioning result.

Description

technical field [0001] The invention relates to the technical field of voltage sag source analysis, in particular to a method for locating a voltage sag source. Background technique [0002] In general, locating the source of a voltage sag refers to determining on which side of the monitoring device the disturbance that caused the voltage sag occurred. Referring to the direction of the fundamental active power flow before the sag, if the disturbance occurs behind the monitoring point, it is called the upstream direction; if the fault occurs in front of the monitoring point, it is called the downstream direction. [0003] Power quality problems may come from the power supply system side, or from the user side, or the result of the joint action of both parties. In terms of the certification of power quality problems, the two parties often have differences or even fall into economic disputes. Accurate identification and Determining the location of the voltage sag source is hel...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 郭成李胜男覃日升赵泽平徐志邢超段锐敏
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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