Comprehensive online monitoring method for capacitor and based on redundant data

Abstract

The invention relates to a comprehensive online monitoring method for a capacitor and based on redundant data, and belongs to the technical field of electric power systems. According to the technicalscheme, an information fusion technology is introduced into capacitor online monitoring, redundant information with multiple data sources is fully used, a weight coefficient of each independent algorithm is obtained according to a weighted data fusion algorithm and capacitor acceptance test and routine test data, and a final capacitance value is obtained. The comprehensive online monitoring methodcan be integrated into an existing capacitor protection and measurement and control device, the investment of new equipment is reduced, and the wiring is simplified; when any one sensor fails, an online monitoring system can detect the fault location and issue a sensor fault signal, the measurement of a true capacitance value of the capacitor is not affected, and a capacitor warning signal is notaccidentally sent; and when the capacitor has faults such as fuse blow or capacitor component breakdown, the method can detect the fault location in real time and issue the capacitor warning signal,and high reliability and accuracy are achieved.

Description

technical field [0001] The invention relates to a comprehensive on-line monitoring method for capacitors based on redundant data, which belongs to the technical field of power systems. Background technique [0002] In recent years, capacitor damages have often occurred in parallel capacitor banks in daily operation. The failure rate of capacitor devices is relatively high, and group explosions and group damage failures have occurred many times, resulting in obvious fluctuations in grid voltage, increased active and reactive power losses, and the use of capacitors. The service life is shortened, which affects the safe operation of the power grid. From the perspective of operation, the overvoltage shock caused by the switching capacitor operation of the circuit breaker is the main reason for the failure of parallel capacitors. A single capacitor is composed of capacitive elements connected in series and parallel. When the capacitor bank is subjected to an overvoltage impact, ...

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Problems solved by technology

[0003] In the current capacitor bank online monitoring system, there is a method of monitoring using SCADA system data, but the calculation accuracy is not ideal; there is a method of using the voltage of the discharge coil and the current of the current transformer to calculate the capacitance value for monitoring, but when the transformer fails False alarms will occur, and the fault tolerance is low

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