Electric power system high voltage parallel reactor overcurrent false alarm discrimination method
A technology of power system and discrimination method, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., can solve the problem of inaccurate judgment results, and achieve the effect of easy-to-understand and accurate judgment of the operation method
Active Publication Date: 2018-04-27
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to distinguish whether the overvoltage alarm is a false alarm, which is calculated by the current flowing through the high-voltage shunt reactor, because the accuracy of the voltage transformer and current transformer, and the system voltage itself have errors, resulting in inaccurate judgment results , the purpose is to provide a method for judging false overcurrent alarms of high-voltage shunt reactors in power systems, so as to solve the above problems
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[0051]like figure 1 As shown, a method for discriminating overcurrent false alarms of high-voltage shunt reactors in power systems according to the present invention takes a 500kV transmission line of the power grid as an example, and uses a piece of measured data to discriminate the authenticity of overcurrent alarms of high-voltage shunt reactors connected at its ends. During this time period, 17,973 minutes out of 44,640 minutes had an overcurrent alarm, which aroused great attention from the operation and maintenance personnel. At the same time, through data comparison, it is also found that even if the measured voltage is lower than the rated voltage, there are still over-current alarms for more than 7100 minutes. Moreover, even if the measured voltage is higher than the rated voltage, there are still no alarms for more than 6900 minutes. Therefore, the operation and maintenance personnel suspect that there is a problem in the relevant measurement link.
[0052] Accordi...
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The invention discloses an electric power system high voltage parallel reactor overcurrent false alarm discrimination method. The method comprises steps that s1, modeling, a structure array Origin_Data, Structure{time_t Time_Data; double Voltage; intmessage;}Origin_Data[X] is defined, wherein time_t represents the time type, double represents the double floating point number, int represents the integral type, Time_Data represents the data measurement time, Voltage represents the voltage value, message represents whether a current alarm occurs in Time_Data, and X represents the element quantityand at least comprises 44640 elements; through system message measurement and control, whether the current alarm occurs in the corresponding time is determined, if an overcurrent message occurs, message variables of the corresponding elements of the Origin_Data matrix are made to be 1, otherwise, if no message is issued, message variables of the corresponding elements are made to be 0; and s2; data pre-processing, a value domain of the voltage is divided into intervals at same widths, the widths of the intervals are Y, the median of the intervals is taken as a classification value representing a data value of the intervals, and the quantity of the intervals is number_area.
Description
technical field [0001] The invention relates to a method for discriminating alarms, in particular to a method for discriminating false alarms over currents of high-voltage shunt reactors in electric 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] Engineering experience shows that there are often two reasons for the overvoltage alarm of high voltage shunt reactors. The first reason is that due to the influence of the operation mode of the power system, the voltage ...
Claims
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Login to View More IPC IPC(8): G01R19/165G01R35/00
CPCG01R19/165G01R35/00
Inventor 高剑滕予非李熠何锐冯世林李小鹏王云丽
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST