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Neural network inverse-based soft sensing method for compensation capacity and medium loss of capacitor and on-line monitoring

A neural network inverse and neural network technology, applied in the field of intelligent capacitor online monitoring system of distribution network, can solve the problems of no patents and documents, etc., achieve the effect of easy engineering implementation and overcome strong dependence

Inactive Publication Date: 2012-01-25
JIANGSU ZHENAN ELECTRIC POWER EQUIP
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Problems solved by technology

[0004] There are no relevant patents and documents at home and abroad

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  • Neural network inverse-based soft sensing method for compensation capacity and medium loss of capacitor and on-line monitoring
  • Neural network inverse-based soft sensing method for compensation capacity and medium loss of capacitor and on-line monitoring
  • Neural network inverse-based soft sensing method for compensation capacity and medium loss of capacitor and on-line monitoring

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[0035] specific implementation plan

[0036] The specific implementation scheme of the neural network inverse soft measuring method and on-line monitoring system of distribution network intelligent capacitor parameter of the present invention is:

[0037] 1. Specifically determine the input directly measurable online, the output directly measurable online and the non-directly measurable offline analysis in the capacitor operation process 1. According to the model of the operation process of the capacitor:

[0038]

[0039] Here the state dimension is 4, and the input dimension is 2, namely: x=(x 1 , x 2 , x 3 , x 4 ) T , u=(u 1 , u 2 ) T , where the operating current u of the capacitor 1 , capacitor temperature u 2 , Capacitor compensation capacity x 1 , Capacitor dielectric loss x 2 , The operating voltage of the capacitor x 3 , grid frequency x 4 ; is the derivative of capacitor compensation capacity, is the derivative of the dielectric loss of the capac...

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Abstract

The invention relates to a neural network inverse-based soft sensing and soft sensor construction method for variables during an operation process of a power distribution network intelligent capacitor; that is, the invention relates to an on-line estimation method for variables, so that a problem that it is difficult to carry out on-line and real-time measurement on variables by a sensor during a capacitor operation process can be solved. According to an operation process model of a capacitor, a model of an embedded sensor is established; a neural network inverse that is in series connection after the capacitor operation process is constructed to realize a contained sensor inverse; and at last, on-line soft sensing on a compensation capacity and a medium loss of the capacitor is realized. Besides, the neural network inverse is realized by employing a digital signal processor. In addition, the invention relates to an on-line monitoring system for a power distribution network intelligent capacitor. The on-line monitoring system comprises an on-site preset device and a signal acquisition terminal. A sensor detects a corresponded physical quantity on a capacitor unit; after digital analog conversion, the detected physical quantity is sent to a digital signal processor to make fault determination; and an output of a programming logic device controls on-off of a breaker. The on-line monitoring system is sensitive and reliable; and moreover, safe operation of an intelligent capacitor can be guaranteed.

Description

technical field [0001] The invention relates to a soft measurement method for solving the problem of online estimation of three key variables, compensation capacity and dielectric loss, which are difficult to measure online and real-time with sensors in smart capacitors in distribution networks, and a power distribution system with the function of on-line monitoring of capacitor parameters Network intelligent capacitor online monitoring system. Background technique [0002] As an important reactive power compensation device, shunt capacitors are widely used in power systems, and their safe operation plays a very important role in the stable and normal power supply of the entire power system. According to data statistics, various failures of capacitors in online operation occur frequently. The traditional strategy adopted for this is "time-based maintenance". Capacitors found to be operating with damage. Therefore, the development of a comprehensive intelligent monitoring d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 叶小松刘国海吴振飞廖志凌邢鸣梅从立
Owner JIANGSU ZHENAN ELECTRIC POWER EQUIP
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