Method and device for positioning voltage sag source

Abstract

The embodiment of the invention discloses a method for positioning a voltage sag source, which comprises the following steps: according to a power network structure, a fault type, a triggering condition of an electric energy quality monitor and a preset constraint condition, calculating to generate a node position for installing the electric energy quality monitor; establishing a voltage sag source identification model; according to a three-phase voltage of a node at which the electric energy quality monitor is positioned, calculating an unbalanced value of the node, and according to the unbalanced value, judging a circuit fault type; according to the circuit fault type, the voltage sag source identification model corresponding to the circuit fault type and a voltage variable quantity measured by the electric energy quality monitor, calculating to generate the similarity; and comparing the similarity and positioning the voltage sag source. The embodiment of the invention also provides a device for positioning the voltage sag source. By the method and the device for positioning the voltage sag source, which are disclosed by the embodiment of the invention, a special fault recorder does not need to be used, so that the cost is saved; and moreover, complex data preparation does not need to be carried out, data can be captured only by an electric energy quality monitoring network and a further data mining technology is easy to use.

Description

technical field [0001] The invention relates to the field of grid fault location, in particular to a method and device for locating a voltage sag source, which also includes confirming the sag domain of the voltage sag source according to the voltage sag source. Background technique [0002] Basically, grid fault location methods can be divided into three categories: the first category is based on equipment fault location technology, traveling wave technology and fault location devices are based on equipment fault location methods. The traveling wave method requires sophisticated equipment, such as high-speed data acquisition equipment, sensors and global positioning systems to obtain transient traveling waves; the fault display is simpler than the traveling wave technology, it is installed at some positions on the feeder, and when a fault occurs, it lights up In the form of a visual signal to show the fault zone, but the visual signal needs to be transmitted to the control ...

AI Technical Summary

Problems solved by technology

[0005] Among the existing three types of fault location methods, the first type method can have more accurate results, but the equipment cost is higher; the second type method has certain accuracy, but involves a large amount of information, such as historical data and operator experience ; The third category is a single measurement and location method, which is only suitable for identifying the faults of the transformer bus directly connected to the power supply line

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