CN110058073A - A kind of signal triggering method and device based on periodic signal temporal variations amount - Google Patents
A kind of signal triggering method and device based on periodic signal temporal variations amount Download PDFInfo
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- CN110058073A CN110058073A CN201910314171.4A CN201910314171A CN110058073A CN 110058073 A CN110058073 A CN 110058073A CN 201910314171 A CN201910314171 A CN 201910314171A CN 110058073 A CN110058073 A CN 110058073A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The present invention relates to a kind of signal triggering method and device based on periodic signal temporal variations amount, the described method comprises the following steps: S1: collection period signal, obtain transient disturbance amount according to the cyclical signal；S2: judging whether the absolute value of the transient disturbance amount at each collection point is greater than the first setting value, if so, S3 is thened follow the steps, if it is not, then return step S1；S3: judging whether the absolute value of transient disturbance amount is more than or equal to the second setting value greater than the continuous acquisition time of the first setting value, if so, S4 is thened follow the steps, if it is not, then return step S1；S4: trigger signal is generated.Compared with prior art, the present invention has many advantages, such as high sensitivity, applied widely.
Description
Technical field
The present invention relates to a kind of test measuring techniques, more particularly, to a kind of signal based on periodic signal temporal variations amount
Triggering method and device.
Background technique
Triggering refers to is arranged certain trigger condition as desired, and when measured signal meets trigger condition, then capture should
Waveform and corresponding portion, and sampled data is stored as required.Currently used triggering type has level triggers, edging trigger, arteries and veins
Width triggering, slope triggering etc..Level triggers, that is, comparison signal amplitude and triggering level, generate trigger signal if meeting condition；
Edging trigger then when comparison signal rising edge or failing edge, trigger signal is generated if meeting condition；Pulsewidth triggering is then ratio
It is in default pulse duration range compared with the positive pulsewidth of signal or negative pulsewidth and then generates trigger signal；Slope triggers comparison signal when then
Positive slope or negative slope time generate trigger signal if meeting preset time range.There are many existing triggering type, but existing
Have in triggering type, the triggering mode that do not realized according to the variable quantity of measured signal.
The power domain basically formed at present in AC-DC hybrid power grid, AC system disturbance, such as ground connection, large capacity
One of the main reason for capacitive apparatus switching etc. is direct-current commutation failure.And during commutation failure, dc power drops suddenly, gives
Receiving end AC network is sent to be applied with huge active and reactive impact.When switching the disturbances such as operation, equipment fault generation, electricity
Transient process can be generated in current voltage, and this transient process is then the principal element for influencing DC operation.Wherein many transient state
Process will not generate apparent voltage raising or voltage magnitude landing.Currently used triggering mode is unable to satisfy varied
Alternating voltage transient disturbance monitoring needs.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be based on periodic signal
The signal triggering method and device of temporal variations amount.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of signal triggering method based on periodic signal temporal variations amount, method includes the following steps:
S1: collection period signal obtains transient disturbance amount according to the cyclical signal；
S2: judging whether the absolute value of the transient disturbance amount at each collection point is greater than the first setting value, if so, executing step
Rapid S3, if it is not, then return step S1；
S3: judge whether the absolute value of transient disturbance amount is more than or equal to second greater than the continuous acquisition time of the first setting value
Setting value, if so, S4 is thened follow the steps, if it is not, then return step S1；
S4: trigger signal is generated.
Further, transient disturbance amount is obtained according to cyclical signal specifically:
S101: acquiring and stores the last samples data u of cyclical signali, i is sampling sequence number；
S102: judging whether sampling sequence number meets i > kps, if so, S103 is thened follow the steps, if it is not, then enabling i=i+
1, return step S101；
S103: the transient disturbance amount du of calculating cycle signali:
dui=ui-ui-k·ps
In formula, ui-k·psFor the sampled data before the k period of last samples data.
Further, the temporal variations amount of periodic signal is in the criteria data source used of triggering.
Further, first setting value is triggering level.
Further, second setting value is time limit value.
The present invention also provides a kind of signal trigger devices based on periodic signal temporal variations amount, including memory, processing
Device and the program for being stored in the memory and being executed by the processor, the processor are realized when executing described program
Following steps:
S1: collection period signal obtains transient disturbance amount according to the cyclical signal；
S2: judging whether the absolute value of the transient disturbance amount at each collection point is greater than the first setting value, if so, executing step
Rapid S3, if it is not, then return step S1；
S3: judge whether the absolute value of transient disturbance amount is more than or equal to second greater than the continuous acquisition time of the first setting value
Setting value, if so, S4 is thened follow the steps, if it is not, then return step S1；
S4: trigger signal is generated.
Further, transient disturbance amount is obtained according to cyclical signal specifically:
S101: acquiring and stores the last samples data u of cyclical signali, i is sampling sequence number；
S102: judging whether sampling sequence number meets i > kps, if so, S103 is thened follow the steps, if it is not, then enabling i=i+
1, return step S101；
S103: the transient disturbance amount du of calculating cycle signali:
dui=ui-ui-k·ps
In formula, ui-k·psFor the sampled data before the k period of last samples data.
Further, first setting value is triggering level.
Further, second setting value is time limit value.
Compared with prior art, the present invention have with following the utility model has the advantages that
(1) of the invention to judge data source for the temporal variations amount of periodic signal, preferably triggering effect can be obtained；
(2) present invention realizes triggering according to the variable quantity of measured signal, can be applied to own by adjusting setting parameter
The electro-magnetic transient voltage disturbance of type monitors, and is electromagnetic transient in power system process study and AC system disturbance and direct current system
The reciprocal effect process study of operation provides data supporting abundant, has good adaptability, has a wide range of application；
(3) present invention detects disturbance by comparing the difference of adjacent cycle, has higher detection accuracy, sensitivity
It is high.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is that installation site voltage fluctuation situation caused by singlephase earth fault occurs for 1000kV system；
Fig. 3 is that installation site voltage fluctuation situation caused by non-penetrability flashover occurs for 1000kV system；
Fig. 4 is that 500kV system generation singlephase earth fault causes installation site voltage fluctuation situation；
Fig. 5 is that 220kV system generation singlephase earth fault causes installation site voltage fluctuation situation；
Fig. 6 is line single phase grounding failure backarc road re-ignition transient process；
Fig. 7 is the transient process of adjacent lines reclosing process.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment 1
The present embodiment provides a kind of signal triggering methods based on periodic signal temporal variations amount, and this method is according to the week
Phase property signal obtains transient disturbance amount, and the comparison result based on transient disturbance amount and setting value judges whether to generate triggering letter
Number.As shown in Figure 1, this method specifically includes the following steps:
As shown in Figure 1, the signal triggering method provided by the invention based on periodic signal temporal variations amount includes following step
It is rapid:
101) initiation parameter ps, counter O reset preset k, u even n=0, i=1sAnd tsValue, usFor triggering electricity
It is flat, tsFor triggered time limit value, ps is the sampling number in a cycle, and k is a setting periodicity, and parameter k and ps are constant；
102) the last samples data u of collection period signali, registered data ui；
103) judge whether i is greater than the product of k and ps, i.e. i > kps, if it is not, then enabling i=i+1, and execute step
102) it, otherwise thens follow the steps 104)；
104) according to the last samples data of cyclical signal, the transient disturbance amount du of calculating cycle signali:
dui=ui-ui-k·ps
In formula, ui-k·psFor the sampled data before the k period of last samples data；
105) by the absolute value of transient disturbance amount | dui| with triggering level usIt compares, if the absolute value of transient disturbance amount is big
In triggering level us, i.e., | dui| > us, then start the tally function of counter, even n=n+1, executes step 106), otherwise,
Counter O reset, return step 102)；
106) judge whether n is not less than n0, i.e. n >=n0, wherein n0=tsSample, if so, triggering store function,
This sampled data is stored, by counter O reset, and executes step 107), if it is not, then return step 102), Sample is sampling
Rate；
107) corresponding actions are executed according to current triggering mode and specifically judges triggering mode, if continuous trigger mould
Formula, then return step 102), if single-trigger mode, then terminate to sample.
The triggering mode can be used for the transient disturbance monitoring of cyclical signal, improves the sensitivity of transient disturbance monitoring and fits
Use range.
Particularly, which can be in the monitoring of power system voltage transient disturbance, and adjustment setting parameter can expire
The all types of electro-magnetic transient voltage disturbance monitorings of foot are electromagnetic transient in power system process study and AC system disturbance and straight
The reciprocal effect process study of streaming system operation provides data supporting abundant.
Above-mentioned triggering method is applied to broadband electro-magnetic transient voltage on-line monitoring system by the present embodiment, which can be real
When survey record 500kV AC system voltage electro-magnetic transient disturb situation.It is preset as us0~199kV of range, t is arranged in=99kVs=
0.1 μ s-999.9 μ s of range is arranged in 1.0 μ s.The present embodiment surveys the waveform diagram of the typical transient voltage fluctuation event of record respectively such as
Shown in Fig. 2~Fig. 7.
Embodiment 2
Counter is replaced with into timer in the present embodiment, then in the step 105) of embodiment 1 when starting timer
Function judges whether continuous timing time is more than or equal to t in step 106)s, if so, triggering store function, storage is this time
Sampled data resets timer, if it is not, then return step 102).Remaining is the same as embodiment 1.
Embodiment 3
The present embodiment provides a kind of signal trigger devices based on periodic signal temporal variations amount, including memory, processing
Device and the program for being stored in the memory and being executed by the processor, the processor are realized strictly according to the facts when executing program
Apply signal triggering method described in example 1.The signal trigger device can be applied to the monitoring of power system voltage transient disturbance.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (9)
1. a kind of signal triggering method based on periodic signal temporal variations amount, which is characterized in that method includes the following steps:
S1: collection period signal obtains transient disturbance amount according to the cyclical signal；
S2: judging whether the absolute value of the transient disturbance amount at each collection point is greater than the first setting value, if so, thening follow the steps
S3, if it is not, then return step S1；
S3: judge whether the absolute value of transient disturbance amount is more than or equal to the second setting greater than the continuous acquisition time of the first setting value
Value, if so, S4 is thened follow the steps, if it is not, then return step S1；
S4: trigger signal is generated.
2. the signal triggering method according to claim 1 based on periodic signal temporal variations amount, which is characterized in that according to
Cyclical signal obtains transient disturbance amount specifically:
S101: acquiring and stores the last samples data u of cyclical signali, i is sampling sequence number；
S102: judging whether sampling sequence number meets i > kps, if so, thening follow the steps S103, if it is not, then enabling i=i+1, returns
Return step S101；
S103: the transient disturbance amount du of calculating cycle signali:
dui=ui-ui-k·ps
In formula, ui-k·psFor the sampled data before the k period of last samples data.
3. the signal triggering method according to claim 1 based on periodic signal temporal variations amount, which is characterized in that described
The criteria data source used is triggered as the temporal variations amount of periodic signal.
4. the signal triggering method according to claim 1 based on periodic signal temporal variations amount, which is characterized in that described
First setting value is triggering level.
5. the signal triggering method according to claim 1 based on periodic signal temporal variations amount, which is characterized in that described
Second setting value is time limit value.
6. a kind of signal trigger device based on periodic signal temporal variations amount, which is characterized in that including memory, processor with
And the program for being stored in the memory and being executed by the processor, the processor are realized following when executing described program
Step:
S1: collection period signal obtains transient disturbance amount according to the cyclical signal；
S2: judging whether the absolute value of the transient disturbance amount at each collection point is greater than the first setting value, if so, thening follow the steps
S3, if it is not, then return step S1；
S3: judge whether the absolute value of transient disturbance amount is more than or equal to the second setting greater than the continuous acquisition time of the first setting value
Value, if so, S4 is thened follow the steps, if it is not, then return step S1；
S4: trigger signal is generated.
7. the signal trigger device according to claim 6 based on periodic signal temporal variations amount, which is characterized in that according to
Cyclical signal obtains transient disturbance amount specifically:
S101: acquiring and stores the last samples data u of cyclical signali, i is sampling sequence number；
S102: judging whether sampling sequence number meets i > kps, if so, thening follow the steps S103, if it is not, then enabling i=i+1, returns
Return step S101；
S103: the transient disturbance amount du of calculating cycle signali:
dui=ui-ui-k·ps
In formula, ui-k·psFor the sampled data before the k period of last samples data.
8. the signal trigger device according to claim 6 based on periodic signal temporal variations amount, which is characterized in that described
First setting value is triggering level.
9. the signal trigger device according to claim 6 based on periodic signal temporal variations amount, which is characterized in that described
Second setting value is time limit value.
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| CN104793039A (en) * | 2015-04-20 | 2015-07-22 | 清华大学 | Method for measuring overvoltage of electric power system power transmission line |
| CN104991110A (en) * | 2015-06-26 | 2015-10-21 | 广东美的制冷设备有限公司 | Voltage abnormity detection method and device for single phase alternating current power supply |
| CN105137164A (en) * | 2015-08-06 | 2015-12-09 | 江苏省电力公司苏州供电公司 | Voltage sag on-line monitoring device applied in power system |
| CN106199152A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | A kind of voltage dip identification system and method |
| CN108539716A (en) * | 2018-03-20 | 2018-09-14 | 许继集团有限公司 | A kind of protection startup method and apparatus based on transient |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793039A (en) * | 2015-04-20 | 2015-07-22 | 清华大学 | Method for measuring overvoltage of electric power system power transmission line |
| CN104991110A (en) * | 2015-06-26 | 2015-10-21 | 广东美的制冷设备有限公司 | Voltage abnormity detection method and device for single phase alternating current power supply |
| CN105137164A (en) * | 2015-08-06 | 2015-12-09 | 江苏省电力公司苏州供电公司 | Voltage sag on-line monitoring device applied in power system |
| CN106199152A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | A kind of voltage dip identification system and method |
| CN108539716A (en) * | 2018-03-20 | 2018-09-14 | 许继集团有限公司 | A kind of protection startup method and apparatus based on transient |
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Application publication date: 20190726 |