Metering system secondary circuit monitoring method and device based on fundamental wave zero sequence characteristics

Abstract

The invention discloses a metering system secondary circuit monitoring method and device based on fundamental wave zero sequence characteristics. The method comprises the steps as follows: acquiring three-phase voltage in a voltage circuit of a high-voltage metering system, three-phase current in a current circuit and neutral current; obtaining a zero sequence voltage component and a zero sequencecurrent component through vector superposition; extracting amplitude and phase of a fundamental wave zero sequence component; establishing a classifier based in the depth belief network with amplitude and phase of fundamental wave voltage, amplitude and phase of fundamental zero sequence point current and the absolute value of the difference between the fundamental wave zero sequence current andneutral current as input variables and various faults as output variables to realize classification and recognition of faults. Secondary circuit fault characteristics of the high-voltage metering system can be extracted accurately, various faults can be classified and recognized accurately, so that faults are effectively eliminated, secondary circuits are monitored in real time, and the safety, stability and accuracy of electric energy metering are guaranteed.

Description

technical field [0001] The invention relates to the state monitoring and fault diagnosis technology of the secondary circuit of a high-voltage metering system, in particular to a method and a device for monitoring the secondary circuit of the metering system based on the zero-sequence characteristic of the fundamental wave, which are used for monitoring the voltage circuit and the current circuit of the high-voltage electricity metering system. condition monitoring and fault diagnosis. Background technique [0002] With the development of my country's economy, the power consumption has increased sharply, and the requirements for the stability of power supply and distribution are getting higher and higher. High-voltage power metering system, as an important part of electric energy metering, is very important for the safety and stability of the system. Therefore, it is of great significance to monitor the current and voltage status of the secondary circuit of the high-voltage ...

AI Technical Summary

Problems solved by technology

The traditional loss of voltage and current alarm devices start from the definition of voltage loss and current loss to monitor the state of voltage and current. Because the definition of voltage loss and current loss has changed, many false alarms and other adverse situations have been brought about.

These adverse conditions lead to the following problems: 1) cause inaccurate electric energy measurement, and bring property losses to users and power supply companies; 2) cause malfunction of the fault removal device, which interferes with the normal operation of the metering secondary circuit; 3) cannot Timely removal of faults seriously threatens the stable operation of the metering secondary circuit

Therefore, in view of the problems that the current loss of voltage and current alarm devices cannot find special faults, misjudgments, and poor real-time monitoring capabilities, suitable methods are studied and related devices are designed to realize real-time monitoring of voltage and current states, and improve voltage loss. The accuracy of loss fault identification is of great significance for maintaining the safety and stability of the secondary circuit of the high-voltage metering system

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