Historical data sample library and algorithm validation-based DC electric quantity measurement and fault discrimination method

Abstract

The invention discloses a historical data sample library and algorithm validation-based DC electric quantity measurement and fault discrimination method. According to the method, during the operationprocess of a direct-current power transmission system, the voltage measurement value of a direct-current bus of a valve group is acquired. The measurement value is compared with a historical voltage value measured at the same delivered power value, and the difference degree between the measurement value and the historical voltage value is calculated. If there is no difference between the measurement value and the historical voltage value, the measurement value is compared with the voltage theoretical value of the direct-current bus of the valve group. Meanwhile, the difference degree between the measurement value and the voltage theoretical value of the direct-current bus of the valve group is calculated. If there is no difference between the measurement value and the voltage theoretical value of the direct-current bus of the valve group, the input power of the alternating-current side of the valve group is compared with the output power of the direct-current side. Meanwhile, the difference degree between the input power of the alternating-current side of the valve group and the output power of the direct-current side is calculated. If any difference degree is larger than a presetthreshold, the voltage measurement value of the direct-current bus of the valve group is judged to be abnormal. Otherwise, the voltage measurement value of the direct-current bus of the valve group isjudged to be normal. According to the invention, both the theoretical analysis and the verification of actually measured data show that, the electric quantity measurement and the fault discriminationare accurate. The method is simple and good in effect.

Description

technical field [0001] The invention relates to a method for discriminating faults in direct current electric quantity measurement, in particular to a method for discriminating faults in direct current electric quantity measurement based on historical data sample databases and algorithm verification, and belongs to the technical field of direct current control and protection of electric power systems. Background technique [0002] The Yunnan-Guangdong ±800 kV DC transmission project Chusui DC and China Southern Power Grid's second ±800 kV UHV DC ordinary overseas DC have too many causes, such as DC bus voltage and other key electrical quantity measurement deviations, which lead to abnormal trigger angles of valve groups and commutation It can be seen that the measurement value deviation caused by such a one-time equipment failure cannot be identified by comparing the sampling values ​​of the two sets of measurement loops in the redundantly designed measurement system, but the...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing DC measurement system cannot detect a device failure and cause measurement deviation, and propose a DC electrical quantity measurement fault discrimination method based on historical data sample database and algorithm verification to eliminate the dead angle of the measurement system. , to improve the reliability of the measurement results

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