CN106199327A - The harmonic wave antidote of power system and device - Google Patents
The harmonic wave antidote of power system and device Download PDFInfo
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- CN106199327A CN106199327A CN201510217618.8A CN201510217618A CN106199327A CN 106199327 A CN106199327 A CN 106199327A CN 201510217618 A CN201510217618 A CN 201510217618A CN 106199327 A CN106199327 A CN 106199327A
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- wave
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- higher hamonic
- power system
- harmonic
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Abstract
The invention provides harmonic wave antidote and the device of a kind of power system, wherein, include the following: the current and voltage signals gathered under work of electric power system state；Voltage and current signal sampling obtained is transferred to protective relaying device; and first pass through the low pass filter in protective relaying device; described protective relaying device also includes protective loop and fault wave recording device; wherein; the higher hamonic wave value of voltage and current signal can be corrected by described protective loop; meanwhile, during described fault wave recording device can transfer described protective loop, higher hamonic wave value is corrected by the rectification parameter about higher hamonic wave value.And this invention removes the impact that higher hamonic wave is sampled by low pass filter, enable failure wave-recording software to show the harmonic value of reality.Further, in power system fault analysis, can facilitate and directly obtain harmonic information accurately, improve the reliability that harmonic information is analyzed by failure wave-recording.
Description
Technical field
The present invention relates to power system, particularly relate to harmonic wave antidote and the dress of a kind of power system
Put.
Background technology
In the protective relaying device of existing power system, fault wave recording device does not accounts for hardware
The impact on harmonic component of the low pass filter of analog loopback.Specifically, by low pass filter
The higher hamonic wave of the power for operation magnitude of voltage of power system can be weakened, therefore at fault wave recording device
In will reveal whether through the value that low pass filter has been decayed, and improper high order filter value.Therefore,
The high order filter value that user can demonstrate according to the fault wave recording device work shape to whole power system
Condition and fault etc. are analyzed and adjust, thus cause erroneous judgement
Summary of the invention
First aspect present invention provides the harmonic wave antidote of a kind of power system, wherein, including
Following steps: gather the current and voltage signals under work of electric power system state；The electricity that sampling is obtained
Current voltage signal is transferred to protective relaying device, and first passes through the low pass filtered in protective relaying device
Ripple device, described protective relaying device also includes protective loop and fault wave recording device, wherein, described
The higher hamonic wave value of voltage and current signal can be corrected by protective loop, and meanwhile, described fault is recorded
Wave apparatus can be transferred in described protective loop about the rectification parameter of higher hamonic wave value higher hamonic wave value
Correct.And this invention removes the impact that higher hamonic wave is sampled by low pass filter, make fault
Record ripple software can show the harmonic value of reality.Further, in power system fault analysis, permissible
Convenient directly obtaining harmonic information accurately, improve that harmonic information analyzed by failure wave-recording can
By property.
Further, the rectification parameter of described higher hamonic wave is based on described low pass filter and institute
That states power system controls what device drew.
Further, described fault wave recording device obtains declining of described higher hamonic wave by correcting parameter
Depreciation, to compensate higher hamonic wave value.
Second aspect present invention provides the harmonic wave apparatus for correcting of a kind of power system, wherein, and including:
Harvester, it is for gathering the current and voltage signals under work of electric power system state；Relay protection
Device, and first described current and voltage signals is passed through a wherein low pass filter, wherein, described
Protective relaying device includes protective loop and fault wave recording device, and it obtains from described harvester and adopts
The voltage and current signal that sample obtains, wherein, described protective loop can be to the high order of voltage and current signal
Harmonic value is corrected, meanwhile, described fault wave recording device can transfer in described protective loop about
Higher hamonic wave value is corrected by the rectification parameter of higher hamonic wave value.And this invention removes low pass filtered
The impact that higher hamonic wave is sampled by ripple device, enables failure wave-recording software to show the harmonic value of reality.
Further, in power system fault analysis, can facilitate and directly obtain harmonic information accurately,
Improve the reliability that harmonic information is analyzed by failure wave-recording.
Accompanying drawing explanation
Fig. 1 is the knot of the harmonic wave apparatus for correcting of the power system according to one specific embodiment of the present invention
Structure schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is illustrated.
As it is shown in figure 1, first the voltage and current of power equipment/circuit 100 is entered by sampling apparatus
Row sampling, and the working voltage current value that sampling obtains is transferred to protective relaying device 200.Its
In, protective relaying device 200 includes low pass filter 201, protective loop 202 and fault
Wave recording device 203.The higher hamonic wave of the operating current voltage of power system have passed through low-pass filtering
Decay is created after device 201, and the protective loop 202 in protective relaying device 200 and fault
The higher hamonic wave value decayed can be corrected by wave recording device 203 respectively, thus is recorded by fault
Ripple software higher hamonic wave value after client 300 display is corrected, it is right to enable a user to
The working condition of power system and failure condition judge soundly and adjust.
First aspect present invention provides the harmonic wave antidote of a kind of power system, and described harmonic wave is rectified
Correction method comprises the steps:
Step S1 is first carried out, sampling apparatus (not shown) gathers the electronic equipment of power system
Current and voltage signals under the duty of/circuit 100.Wherein, the current/voltage letter of power system
Number can be divided into the numerical value summation from 0 subharmonic to nth harmonic by Fourier space, wherein 0
Subharmonic is DC quantity, is exactly for 1 time first-harmonic amount, and the harmonic wave more than 1 time is just higher hamonic wave.
Then, performing step S2, primary voltage current signal transfer sampling obtained is protected to relay
Protection unit 200.The current and voltage signals that sampling obtains can first pass through a low pass filter 201, logical
The higher hamonic wave value having crossed low pass filter 201 can be decayed.Its corresponding relation is as follows:
Nth harmonic value sampled value=nth harmonic show value × kn,
Wherein, kn represents the corresponding nth harmonic reduction coefficient at filtering channel, n 1.
Already described above and, what the braking function that shoves in protection device 202 was used is after revising
Higher hamonic wave value, and in fault wave recording device 203 display harmonic value be unmodified, this
The action behavior of braking of having led to shoving is conflicting with the harmonic value of failure wave-recording, affects electric power
The conclusion of system trouble analysis.For example, it is assumed that secondary harmonic brake initiation value is 15%.Work as secondary
When harmonic wave actual value is 15%, braking of shoving is correct to be started and locking is correlated with defencive function.And, ginseng
Examine the second harmonic show value of failure wave-recording, only 14.1% (< 15%), this and action behavior phase
Contradiction.Therefore, accident analysis can get the wrong sow by the ear, i.e. relay fail or measured value is wrong,
This is that we are not intended to see.
So-called low pass filter is that a part of high-frequency signal (such as 2 subharmonic) is filtered, the most logical
Cross the signal of low frequency (such as 50Hz first-harmonic).
Specifically, described protective relaying device 200 also includes protective loop 202 and failure wave-recording dress
Put 202.Wherein, protective loop 202 performs defencive function, i.e. judges equipment state and short circuit
Etc. fault, thus trigger a warning function or trip avoidance function.And fault wave recording device 202 is
For indicating the i.e. fault state of work of subscriber equipment, including a failure wave-recording software by height
Subharmonic shows in client 300, and client then can judge equipment after seeing the higher hamonic wave of display
Whether duty is normal, the analyzing failure cause the most further when client is judged as malfunction
Thus equipment is debugged.But, the higher hamonic wave value decaying later can allow client cause erroneous judgement
Disconnected.
Therefore, the higher hamonic wave value of voltage and current signal can be corrected by described protective loop 202,
Meanwhile, described fault wave recording device 203 can utilize the file of itself to transfer described protection to return
In road, higher hamonic wave value is corrected by the rectification parameter about higher hamonic wave value.
Further, the rectification parameter of described higher hamonic wave be based on described low pass filter 201 with
And described power system control what device (not shown) drew.
Specifically, described fault wave recording device 203 obtains described higher hamonic wave by correcting parameter
Pad value, to compensate higher hamonic wave value.Fault wave recording device 203 includes
COMTRADE.Message file .INF is an optional file in fault wave recording device 203,
Its Main Function is to provide, for COMTRADE, the failure logging information being correlated with, thus improves
COMTRADE processes and analyzes the ability of fault data..INF be unique file, therefore for
Calling of COMTRADE has good compatibility and motility.Any program reads .INF literary composition
Part can identify and process corresponding common portion header file, link and other normal data.
Additionally .INF file data form is similar to Windows.INI file.Most program language is all
Can be written and read it, file structure is also familiar with by many programs and user.Certain of message file
A little parts are replicated and are stored in .CFG configuration file..CFG it is COMTRADE with .DAT
Master file, any data variable all can be stored in corresponding both of these documents.The present invention is just
.INF original in fault wave recording device 203 is utilized to call rectification parameter from protective loop 202 also
Generate comtrade file, thus correctly resolve in failure wave-recording software and display higher hamonic wave.
Specifically, illustrating, the initial higher hamonic wave value in power system current/voltage value is such as
Following table:
| Harmonic value | Attenuation rate |
| 2 subharmonic value | 100% |
| 3 subharmonic value | 100% |
| 5 subharmonic value | 100% |
Wherein, attenuation rate 100% represents that harmonic value does not decays.
And have passed through the higher hamonic wave value such as following table of low pass filter:
| Harmonic value | Attenuation rate |
| 2 subharmonic value | 94% |
| 3 subharmonic value | 84% |
| 5 subharmonic value | 62% |
And after fault wave recording device 203 obtains the pad value of higher hamonic wave, utilize from protecting back
The rectification parameter that road 202 is read, thus the higher hamonic wave value decayed is compensated, thus
To correct higher hamonic wave value, as shown in the table:
| Harmonic value | Attenuation rate |
| 2 subharmonic value | 100% |
| 3 subharmonic value | 100% |
| 5 subharmonic value | 100% |
Second aspect present invention additionally provides the harmonic wave apparatus for correcting of a kind of power system, wherein, bag
Including harvester, it is for gathering the current and voltage signals under work of electric power system state, and by institute
State current and voltage signals by a low pass filter.Described harmonic wave apparatus for correcting also includes that a relay is protected
Protection unit, wherein, including protective loop and fault wave recording device, it obtains from described harvester
The voltage and current signal that sampling obtains, wherein, described protective loop can be to the height of voltage and current signal
Subharmonic value is corrected, and meanwhile, described fault wave recording device can be transferred in described protective loop and close
Higher hamonic wave value is corrected by the rectification parameter in higher hamonic wave value.
It should be noted that due to the prior art harmonic wave apparatus for correcting to the power system of the present invention
Existing ready-made software and hardware realizes, and therefore, for simplicity's sake, repeats no more.
Startup and the fault of motor, electromotor and transformator are had significantly by Harmonious Waves in Power Systems
Impact, therefore, harmonic wave numerical analysis accurately is particularly significant to power system fault analysis.At present
The failure wave-recording software of protection device does not consider the low pass filter impact on harmonic value, Zhi Nengxian
Show the numerical value after weakening so that user can not obtain conclusion accurately to the analysis of harmonic information.And
This invention removes the impact that higher hamonic wave is sampled by low pass filter, enable failure wave-recording software
The harmonic value that display is actual.Further, in power system fault analysis, direct obtaining can be facilitated
To harmonic information accurately, improve the reliability that harmonic information is analyzed by failure wave-recording.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should
Recognize that the description above is not considered as limitation of the present invention.Read those skilled in the art
After having read foregoing, multiple amendment and replacement for the present invention all will be apparent from.Cause
This, protection scope of the present invention should be limited to the appended claims.Additionally, should be by right
Any reference in requirement is considered as limiting involved claim；" include " that a word is not excluded for
Device unlisted in other claim or description or step；The word such as " first ", " second "
Only it is used for representing title, and is not offered as any specific order.
Claims (4)
1. a harmonic wave antidote for power system, wherein, comprises the steps:
Gather the current and voltage signals under work of electric power system state；
Voltage and current signal sampling obtained is transferred to protective relaying device, and first passes through relay
Low pass filter in protection device, described protective relaying device also includes protective loop and fault record
Wave apparatus, wherein, the higher hamonic wave value of voltage and current signal can be corrected by described protective loop,
Meanwhile, about the rectification of higher hamonic wave value during described fault wave recording device can transfer described protective loop
Higher hamonic wave value is corrected by parameter.
Harmonic wave antidote the most according to claim 1, it is characterised in that described high order is humorous
The rectification parameter of ripple is that control device based on described low pass filter and described power system draws
's.
Harmonic wave antidote the most according to claim 1, it is characterised in that described fault is recorded
Wave apparatus obtains the pad value of described higher hamonic wave by correcting parameter, to carry out higher hamonic wave value
Compensate.
4. a harmonic wave apparatus for correcting for power system, wherein, including:
Harvester, it is for gathering the current and voltage signals under work of electric power system state；
Protective relaying device, by described current and voltage signals by a wherein low pass filter, wherein,
Described protective relaying device also includes protective loop and fault wave recording device, and it is from described harvester
Obtaining the voltage and current signal that sampling obtains, wherein, described protective loop can be to voltage and current signal
Higher hamonic wave value correct, meanwhile, described fault wave recording device can transfer described protective loop
In about the rectification parameter of higher hamonic wave value, higher hamonic wave value is corrected.
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| CN201510217618.8A CN106199327B (en) | 2015-04-30 | 2015-04-30 | The harmonic wave antidote and device of electric system |
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| CN201510217618.8A CN106199327B (en) | 2015-04-30 | 2015-04-30 | The harmonic wave antidote and device of electric system |
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| CN106199327A true CN106199327A (en) | 2016-12-07 |
| CN106199327B CN106199327B (en) | 2018-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710040A (en) * | 2018-05-28 | 2018-10-26 | 国网河北省电力有限公司衡水供电分公司 | Shunt capacitor is protected and monitoring integration method |
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| CN102313857A (en) * | 2011-07-04 | 2012-01-11 | 武汉大学 | Method and device for analyzing fault recording data of power system |
| CN102565574A (en) * | 2011-12-06 | 2012-07-11 | 中国人民解放军海军工程大学 | Ship electric energy quality monitoring system |
| CN102646958A (en) * | 2012-03-31 | 2012-08-22 | 内蒙古大唐国际托克托发电有限责任公司 | Asynchronous self-oscillating protection method and protection device of generator |
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| JPH10142279A (en) * | 1996-11-08 | 1998-05-29 | Toyo Electric Mfg Co Ltd | Testing device for higher harmonic suppressor |
| CN101102048A (en) * | 2007-06-29 | 2008-01-09 | 清华大学 | A harmonic current prediction method for compensating control delay |
| CN101852826A (en) * | 2009-03-30 | 2010-10-06 | 西门子公司 | Harmonic analysis method for power system and device thereof |
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| CN106199327B (en) | 2018-12-21 |
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