A Discrimination Method for Overcurrent False Alarm of High Voltage Shunt Reactor in Power System

Abstract

The invention discloses a method for discriminating overcurrent false alarm of high voltage shunt reactors of a power system. The method includes the steps: collecting training sample data of high voltage shunt reactors when the high voltage shunt reactors are running normally; calculating the collected training sample condition probability; performing logistic regression fitting on the training sample data; solving the training sample data characteristics; solving the one-dimensional comprehensive characteristics of the training sample; estimating the comprehensive characteristic distributionparameters of the training sample; when detecting the high voltage shunt reactors, collecting the detection data of the high voltage shunt reactors; calculating the condition probability of the detection data; performing logistic regression fitting on the detection data; solving the detection data characteristics; solving the comprehensive characteristics of the detection data; determining whether the comprehensive characteristics of the detection data satisfy the criteria; if so, outputting that alarm is false alarm; and if not, outputting that alarm is normal alarm. Therefore, the method for discriminating overcurrent false alarm of high voltage shunt reactors of a power system avoids the defects that the line needs off-the-line and the experiment time is longer relatively, and avoids the influence of measurement error on the determination accuracy.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for judging false overcurrent alarms of high voltage shunt reactors in power systems. Background technique [0002] High-voltage shunt reactors are generally connected between the end of ultra-high-voltage and ultra-high-voltage transmission lines and the ground, and play the role of compensating the charging reactive power to the ground and suppressing power frequency overvoltage when the transmission line is light-loaded. However, in the actual operation of the power system, the overcurrent alarm of the high voltage shunt reactor often occurs frequently, which affects the safe and reliable operation of the power system. [0003] According to the principle of circuit theory, the current I flowing through the high voltage shunt reactor L It can be calculated with the following formula: [0004] [0005] In the formula, U L is the effective value of the line voltage at ...

AI Technical Summary

Problems solved by technology

The second reason is that there is a problem with the current measurement device in the high-voltage shunt reactor, which leads to an increase in error, and even a wrong measurement result that triggers an alarm

However, due to the accuracy of voltage transformers and current transformers, there are errors in the system voltage itself, which leads to certain difficulties in the implementation of this method

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