CN113741387A - Threshold value judgment method for instantaneous fault occurrence intensity - Google Patents
Threshold value judgment method for instantaneous fault occurrence intensity Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
A threshold value judging method for instantaneous fault occurrence strength belongs to the field of power transmission control. The electric control device can generate some transient faults of electric signals, and the transient faults can be converted into permanent faults after the occurrence intensity of the transient faults exceeds the allowable intensity. The invention mainly provides a corresponding judgment mode of 'allowable intensity'. In the control, the instantaneous fault is accumulated, and when the accumulated value reaches a certain threshold value, the instantaneous fault is converted into a permanent fault. The invention mainly proposes how to determine the threshold. The method comprises the steps of firstly counting the pre-collected real-time data of the electric appliance signals to obtain the statistical distribution of the electric appliance signals, and obtaining the upper limit value and the lower limit value of the normal signals of the signals, wherein the frequency of the signal values within a certain offset (such as a 5% interval) below the upper limit value and a certain offset (such as a 5% interval) above the lower limit value is counted to obtain the threshold value. The invention is easy to implement.
Description
Technical Field
The invention belongs to the field of power transmission control, and particularly relates to a threshold value determining method for determining an instantaneous fault in an embedded electronic system as a permanent fault.
Background
The embedded electric control system of the power transmission device has a complex working environment, and each signal can be abnormal and can be divided into transient faults and permanent faults. Transient faults are faults which affect electrical equipment transiently and can recover automatically within a certain time due to external or internal uncertain factors; the occurrence of permanent faults affects the operation of the equipment, and the normal operation of the equipment cannot be recovered without taking measures. Transient faults may translate into permanent faults under certain conditions. A type of transient fault persists for a certain threshold and is established as a permanent fault. At present, the threshold value is selected through experience, and no quantitative selection method is available.
Disclosure of Invention
The invention provides a threshold value judging method for the occurrence strength of an instantaneous fault, aiming at solving the problem of selecting a threshold value when the instantaneous fault is determined to be a permanent fault.
A threshold value judging method of instantaneous fault occurrence intensity is characterized by comprising the following steps:
(1) collecting signal in real time for a certain period of time T0The sampling period of the signal is delta T, and the upper limit value of the originally designed signal of the signal is a0And a lower limit value of b0；
(2) Counting the frequency of the signal value, i.e. using the signal value as abscissa and the ordinate as the corresponding frequency, i.e. the frequency of the signal, obtaining the distribution graph of the signal, and obtaining the interval [ (1-5%) a) below the upper limit value by 5% in the graph0，a0](ii) a With a lower limit value of more than 5%, i.e. a 5% interval [ b ]0，(1+5％)b0]；
(3) In the distribution plot, a value in the interval [ (1-5%) a is obtained0，a0]Of (1) signal frequency n1In the interval [ b0，(1+5％)b0]Of (1) signal frequency n2And the total signal frequency n0；
(4) Threshold t for establishing an overrun transient fault as a permanent fault0Comprises the following steps:
instantaneous over the lower limitThreshold t for establishing a fault as a permanent fault1Comprises the following steps:
in the formula (I), the compound is shown in the specification,
indicating rounding. And when n is1、n2＝n0When t is0、t1Taking 1;
the transient fault is established as a permanent fault by a transient fault duration equal to or greater than a threshold value.
In the step (3), the frequency of signal generation is obtained.
The principle of the invention is as follows: there are a class of transient faults that exceed a certain limit in duration that will result in a permanent fault failure of the system. When most signals are concentrated in a certain interval and the distance between the interval and the signal abnormal limit value is short, the threshold value when the instantaneous fault is established as the permanent fault is long; when the distance between the section and the signal abnormality limit is long, the threshold value for establishing the instantaneous fault as a permanent fault should be short.
The invention has the beneficial effects that: the invention is easy to realize, simple and reliable, and effectively improves the safety of the system.
In the description of the present specification, reference to the description of the terms "certain limit," "threshold," "upper limit," "lower limit," or "5%" or the like, means that a particular feature or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that modifications, variations, substitutions and alterations may be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Drawings
FIG. 1 original speed signal data diagram (sample time 10ms as an example)
FIG. 2 is a schematic diagram of the frequency statistics of the rotation speed signals
FIG. 3 is a schematic diagram of a method for determining a threshold of an instantaneous failure occurrence intensity
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings.
The invention is suitable for the fault establishment function of the electric control system of the power transmission device. An electronic control unit in the electric control system monitors the electric signals of the whole system in real time and judges whether corresponding parts have instantaneous faults or not. The invention determines a threshold value for establishing a transient fault as a permanent fault based on the statistical signal values.
The present invention takes a turbine speed signal when a certain transmission is unloaded as an example, and fig. 1 is a graph of a transmission speed signal value based on time (a sampling period Δ T is 10ms, and a total sampling time length is 300 s). Theoretical upper limit value a of normal range of idling turbine speed signal02350rpm lower limit b0＝700rpm。
The frequency of the rotation speed signal value is counted, that is, the signal value is used as the abscissa, the ordinate is the corresponding occurrence frequency, that is, the frequency of the signal, and the distribution diagram of the signal is obtained as shown in fig. 2. Obtaining the interval [2235.5, 2350 ] of 5% below the upper limit of the rotating speed]Of (1) signal frequency n12799 and 5% above the lower limit [700, 735 ]]Of (1) signal frequency n28527 and the total signal frequency n0＝30000；
Threshold t for establishing an overrun transient fault as a permanent fault0Comprises the following steps:
threshold t for establishing an overrun transient fault as a permanent fault1Comprises the following steps:
Claims (1)
1. a threshold value judging method of instantaneous fault occurrence intensity is characterized by comprising the following steps:
(1) collecting signal in real time for a certain period of time T0The sampling period of the signal is delta T, and the upper limit value of the originally designed signal of the signal is a0And a lower limit value of b0；
(2) Counting the frequency of the signal value, i.e. using the signal value as abscissa and the ordinate as the corresponding frequency, i.e. the frequency of the signal, obtaining the distribution graph of the signal, and obtaining the interval [ (1-5%) a) below the upper limit value by 5% in the graph0，a0](ii) a With a lower limit value of more than 5%, i.e. a 5% interval [ b ]0，(1+5％)b0]；
(3) In the distribution plot, a value in the interval [ (1-5%) a is obtained0，a0]Of (1) signal frequency n1In the interval [ b0，(1+5％)b0]Of (1) signal frequency n2And the total signal frequency n0；
(4) Threshold t for establishing an overrun transient fault as a permanent fault0Comprises the following steps:
threshold t for establishing an overrun transient fault as a permanent fault1Comprises the following steps:
in the formula (I), the compound is shown in the specification,
denotes rounding and when n1、n2＝n0When t is0、t1Taking 1;
the transient fault is established as a permanent fault by a transient fault duration equal to or greater than a threshold value.
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Citations (10)
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|---|---|---|---|---|
| US4872165A (en) * | 1983-09-08 | 1989-10-03 | Hitachi, Ltd. | Fault diagnostic distributed processing method and system |
| KR960027120A (en) * | 1994-12-21 | 1996-07-22 | 임병일 | Automatic opening / closing control device for fault section of distribution line |
| CN101387682A (en) * | 2008-10-27 | 2009-03-18 | 清华大学 | Single-phase earth fault detecting method based on residual current harmonic component |
| CN101661074A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Judging method for transient and permanent faults of transmission line with parallel reactance |
| US20110148430A1 (en) * | 2008-08-29 | 2011-06-23 | Abb Research Ltd. | Method and apparatus for fault identification in a power tansmission line |
| CN102523137A (en) * | 2011-12-22 | 2012-06-27 | 华为技术服务有限公司 | Fault monitoring method, device and system |
| CN103219721A (en) * | 2013-04-19 | 2013-07-24 | 国家电网公司 | Automatic integrated processing method for single-phase earth fault |
| CN111521912A (en) * | 2020-06-05 | 2020-08-11 | 国网江西省电力有限公司鹰潭供电分公司 | Distributed fault line selection method |
| CN112230100A (en) * | 2020-09-29 | 2021-01-15 | 山东大学 | Slow-development permanent fault early warning method and system |
| CN112731056A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault judgment method based on fault indicator |
-
2021
- 2021-08-16 CN CN202110933868.7A patent/CN113741387A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872165A (en) * | 1983-09-08 | 1989-10-03 | Hitachi, Ltd. | Fault diagnostic distributed processing method and system |
| KR960027120A (en) * | 1994-12-21 | 1996-07-22 | 임병일 | Automatic opening / closing control device for fault section of distribution line |
| US20110148430A1 (en) * | 2008-08-29 | 2011-06-23 | Abb Research Ltd. | Method and apparatus for fault identification in a power tansmission line |
| CN101387682A (en) * | 2008-10-27 | 2009-03-18 | 清华大学 | Single-phase earth fault detecting method based on residual current harmonic component |
| CN101661074A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Judging method for transient and permanent faults of transmission line with parallel reactance |
| CN102523137A (en) * | 2011-12-22 | 2012-06-27 | 华为技术服务有限公司 | Fault monitoring method, device and system |
| CN103219721A (en) * | 2013-04-19 | 2013-07-24 | 国家电网公司 | Automatic integrated processing method for single-phase earth fault |
| CN111521912A (en) * | 2020-06-05 | 2020-08-11 | 国网江西省电力有限公司鹰潭供电分公司 | Distributed fault line selection method |
| CN112230100A (en) * | 2020-09-29 | 2021-01-15 | 山东大学 | Slow-development permanent fault early warning method and system |
| CN112731056A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault judgment method based on fault indicator |
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