Anomaly Detection Method of Satellite Power System Based on Cumulative Sum Control Chart

A technology for satellite power supply and anomaly detection, which is used in electrical digital data processing, special data processing applications, instruments, etc. It can solve problems such as wide thresholds, inability to detect minor faults and early warning, and achieve high accuracy and save computing. effect of time

Active Publication Date: 2017-11-14
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the existing satellite power system abnormality detection, such as the threshold value is too wide, can not detect micro-faults and early warning, etc., the present invention proposes a satellite power system abnormality detection method based on accumulation and control charts

Method used

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  • Anomaly Detection Method of Satellite Power System Based on Cumulative Sum Control Chart
  • Anomaly Detection Method of Satellite Power System Based on Cumulative Sum Control Chart
  • Anomaly Detection Method of Satellite Power System Based on Cumulative Sum Control Chart

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specific Embodiment approach 1

[0020] An abnormal detection method for a satellite power system based on cumulative sum control charts, including the following steps:

[0021] Step 1. Obtain the historical data of the normal operation of the nickel-hydrogen battery satellite power supply for a period of time, select the hydrogen pressure value of the power supply as an evaluation parameter, and perform pre-processing (including shaving and smoothing) on ​​the hydrogen pressure value. The hydrogen pressure values ​​are divided into m groups, and the average value p of each group of hydrogen pressure values ​​is calculated j , j=1,2,...m;

[0022] Step 2, calculate the statistical characteristics of the hydrogen pressure value of the power supply, that is, calculate the mean value p described in step 1 j The mean and variance of ;

[0023] Step 3. Determine the tolerance and threshold value of the accumulation and control chart according to the statistical characteristics of the hydrogen pressure value duri...

specific Embodiment approach 2

[0027] As described in step 1 of this embodiment, divide the pretreated hydrogen pressure values ​​into m groups and calculate the average value p of each group of hydrogen pressure values j The steps are as follows:

[0028] The hydrogen pressure value of the power supply is selected as a characteristic parameter of satellite anomaly detection. The hydrogen pressure and the charge are linearly related to a certain extent. When the satellite power supply is working normally, the hydrogen pressure value fluctuates steadily. If the power supply fails, then This fluctuation will deviate from normal; and satellite telemetry data is usually at the second level, and calculating the average value over a period of time is conducive to data smoothing.

[0029] According to the collection law of satellite telemetry data, the acquired historical data is composed of several sampling points, and the continuous n hydrogen pressure value data points are regarded as a group, and there are m g...

specific Embodiment approach 3

[0033] The average value p described in the calculation step 1 described in the step 2 of the present embodiment j The steps for the mean and variance of are as follows:

[0034] Considering the satellite power system due to slight changes in the working environment, the state fluctuations of the power system itself, and the influence of measurement random errors, calculate the statistical characteristics of the hydrogen pressure value of the power supply, that is, the mean value p mentioned in the calculation step 1 j The mean and variance of ;

[0035] Calculate the mean p j mean value of P 0 :

[0036]

[0037] Calculate the mean p j The variance σ of 0 :

[0038]

[0039] Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an abnormal detection method for a satellite power system based on cumulative sum control charts, which relates to the field of power system fault diagnosis. The invention aims to solve the problems that the threshold value in the abnormal detection of the existing satellite power supply system is too wide, and it is impossible to detect tiny faults and early warning. The present invention obtains the historical data of the normal operation of the nickel-metal hydride battery type satellite power supply for a period of time, selects the hydrogen pressure value of the power supply as an evaluation parameter; divides the hydrogen pressure values ​​into m groups and calculates the average value pj of each group of hydrogen pressure values; and then calculates the hydrogen pressure value of the power supply Statistical characteristics of the pressure value, determine the tolerance and threshold value of the cumulative sum control chart; calculate the average value pi of the hydrogen pressure value of the satellite power supply to be detected; use the average value pi of the hydrogen pressure value as the input of the cumulative sum function, and draw the output value in Accumulation and control chart; judge whether the accumulative sum S+(i), S-(i) corresponding to the hydrogen pressure value of the satellite power supply to be detected currently exceeds the threshold value of the accumulative sum control chart, and judge the current working state of the power supply system. The invention is applicable to the fault diagnosis field of nickel-hydrogen battery type satellite power supply system.

Description

technical field [0001] The invention relates to the field of power system fault diagnosis. Background technique [0002] The power supply system is the core system of the satellite. The satellite enters and exits the shadow of the earth along with the charging and discharging of the battery and the solar battery array. When the solar battery array can meet the power supply, the power of the satellite is provided by the solar battery array, and the battery is charged at this time; When the power supply of the solar cell array is insufficient, it will be powered by the battery; when it enters the shadow of the earth, it will be completely powered by the battery. If the power supply of the battery is insufficient at this time, the satellite will not work normally. In serious cases, it will even lose control and become a "death star". [0003] At present, satellite batteries use nickel-metal hydride batteries. The common faults of nickel-hydrogen batteries mainly include battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 李玉庆樊恒海王日新张海龙程瑶徐敏强杨天社
Owner HARBIN INST OF TECH
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