CN109541308A - Harmonic analysis method based on distributed plesiochronous power grid measuring system - Google Patents
Harmonic analysis method based on distributed plesiochronous power grid measuring system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
A kind of harmonic analysis method based on distributed plesiochronous power grid measuring system, the plesiochronous power grid measuring system of distribution are made of display analysing terminal and M platform electric network data collector；Display analysing terminal reads the harmonic voltage U of the data of its multifunctional meter and each collection point of M platform electric network data collector acquisitionnh, electric current InhAmplitude, phase relation are analyzed, and are obtained trend distribution and the harmonic voltage, curent change rule of h subharmonic, are determined harmonic wave source position and recognize the property of harmonic source.
Description
Technical field
The present invention relates to a kind of harmonic analysis methods based on distributed plesiochronous power grid measuring system.
Background technique
With the extensive application of power application electronic device and equipment, mains by harmonics is sharply increased.In industrial electrical network environment, no
Quickly change with attribute plant capacity.Due to the release of national precisely help-the-poor policy, generation of electricity by new energy is broken out again with area format
Property growth, bring serious quality exceeded to fragile power grid-rural power grids.Since Rural Power Distribution Network power supply capacity is weaker, route
Impedance is big, and substantially based on single-phase load, power load is unevenly distributed.Especially when only power grid is powered, peak times of power consumption are in
Existing serious three-phase imbalance state, causes that some single-phase voltage is too low, harmonic wave increases.Distributed photovoltaic is sent out in region as a result,
Electricity will be faced with high density, multiple spot access photovoltaic installation is unevenly distributed, the problem of trend complexity, this will cause regional distribution network wave
Dynamic, voltage is raised, three-phase imbalance and harmonic current increase and random distribution is presented, and easily causes distribution facility and user
Equipment damage.In order to meet power grid end index and power reguirements, adjustment load tap changer is generally taken to make output voltage liter
High measure.The access of photovoltaic power generation at this time, power grid is zero load or light load, and can not on-site elimination photovoltaic power generation feelings
Under condition, photovoltaic power generation will cause network voltage to be further lifted, and exceed national grid standard max, photovoltaic DC-to-AC converter is caused to stop
Machine, a large amount of photovoltaic is by abandoning light.Some photovoltaic DC-to-AC converters businessman does not take power grid quality problem into account for the purpose of getting a profit, not based on
Grid power balanced output characteristic installs photovoltaic, generates electricity by force on the basis of voltage over standard, causes mains by harmonics, voltage serious
Exceeded, it is catastrophic damage to power grid bring, simultaneously that single-phase voltage, which has been approached 300V (national standard is 220V ± 10%),
It is burned with part household electrical appliances, so that precisely help-the-poor policy performs practically no function for country, brings greatly economic damage to country, individual
It loses, and brings negative impact to the photovoltaic power generation benefited the nation and the people.
Thus country turns to control target in response to this problem with rural power grids end treatment and photovoltaic power generation maximum, investment manpower,
Financial resources carry out special subject study.Existing method for synchronously measuring and means to network system lacks, can only be using professional instrument
Table carries out asynchronous measurement to key point each in detected route, then obtains data through analysis, emulation, assessment, according to analysis
As a result corresponding measure is taken.When resonance occurs for power grid, harmonic wave is distributed in rectification power grid, determines harmonic nature, harmonic source
Position analysis is then helpless.And the distributed plesiochronous measurement of power grid has not yet to see Harmonic characteristic analysis and positioning means
It arrives.
Summary of the invention
The purpose of the present invention overcomes power grid end that cannot reach due to the decline of photovoltaic power generation access bring power grid quality, power generation
To the problems such as expection.The characteristics of being localized using power grid resonance is proposed a kind of based on distributed plesiochronous power grid measuring system
Harmonic analysis method.
It is made of using the plesiochronous network system of distribution of the invention display analysing terminal, M platform electric network data collector,
M is integer, M >=1.
At each uniline key point of M platform electric network data collector distributing installation three-phase line in platform area,
Such as photovoltaic power generation simultaneously puts net, load are larger, power electronic equipment is more etc..M platform electric network data collector is recorded simultaneously works as
GPS positioning coordinate, photovoltaic power generation installed capacity, load capacity and the attribute of front position.The M platform electric network data collector installed
It device address code and puts in order, is entered into display analysing terminal by hand.
Display analysing terminal is articulated in the output end positioned at power distribution network transformer low-voltage side, reads platform area respectively and electrically believes
Breath reads the data of the electric network data collector of three-phase line in platform area by carrier wave, wired or wireless network.
The electric network data collector is connect by electric current, voltage sensor with tested measuring point power grid, and installation point is acquired
The power grid electric information at place, including fundamental voltage, electric current and direction, the electric current of each harmonic, the amplitude of voltage and active power
With reactive power etc., and recording function is carried out to failure, has the functions such as correcting time in network, carrier wave, wired or wireless network communication concurrently.
Show analysing terminal by acquisition module, wire and wireless communication interface, display terminal and number in multifunctional meter, carrier set
It is formed according to analyzer-controller.Wherein multifunctional meter is step down side three-phase electrical measuring instrument.Data analysis control is read
The data and M platform electric network data collector data of multifunctional meter are taken, and are analyzed.There are three logical for acquisition module in carrier set
Road, respectively every electric network data collector data in three-phase line in picking platform area.Display terminal can be manually entered storage M platform electricity
Geographical coordinate, photovoltaic power generation capacity, every section of line length of base load characteristic and power grid and the resistance of network data collector installation point
It is anti-.The data, analysis result of real-time display acquisition proposes harmonic wave distribution and harmonic source analysis report.
M platform electric network data collector and display analysing terminal are accessed into the same AC power source first, are connected with each other spacing
No more than 30cm.Electric network data collector collection voltages and electric current, electric network data collector and display analysing terminal communication.Display
Analysing terminal is standard according to the collected electric data of multifunctional meter, to the collected electricity of electric network data collector received
Destiny is stored in display analysing terminal according to progress error analysis, and by analysis result, is received by subsequent display analysing terminal
Electric network data collector each data carry out error correction.
Show that analysing terminal is communicated using carrier communication mode and all electric network data collectors.Display analysing terminal passes through
The single-phase output such as A phase of acquisition module in carrier set is controlled, all electric network datas being mounted in platform area on three-phase line are issued
Collector address.When showing that analysing terminal receives the electric network data collector of response, it may be determined that the electric network data collector
It is mounted in surveyed A phase line.Show that analysing terminal puts in order according to manual typing and has the electric network data of response to adopt simultaneously
Putting in order for the phase line is established in storage address.In addition the electric network data collector localization method of B, C phase line is same as above；
Display analysing terminal takes all data of electric network data collector, error correction in real time online, and will acquire number in real time
According to history comparing in the same time, need to sum respectively, be averaging according to data analysis, maximum value and minimum value calculate, protecting
In the presence of display analysing terminal.Frequency analysis, harmonic source identification and the positioning in later period, the method according to above-mentioned data processing carry out simultaneously
Submit frequency analysis assessment report.
Each collection point that the present invention in real time acquires multifunctional meter and electric network data collector by display analysing terminal
Harmonic voltage Unh, electric current InhAmplitude, phase relation are analyzed, and trend distribution and the harmonic voltage, electricity of h subharmonic are obtained
Rheology law determines harmonic wave source position and recognizes the property of harmonic source.
Steps are as follows for the method for the present invention:
Step 1 filters out exceeded percent harmonic distortion and corresponding determining overtone order h；
Step 2 judges that the position of point occurs for harmonic wave；
The harmonic nature of point occurs for step 3, analysis harmonic wave.
Each step is described as follows:
Step 1, display analysing terminal read multifunctional meter voltage total harmonic distortion THD respectivelyuWith electric current total harmonic distortion THDi
Data, and compared with total harmonic distortion factor permissible value, filter out exceeded percent harmonic distortion and corresponding determining overtone order h.
Specifically:
Display analysing terminal reads multifunctional meter voltage total harmonic distortion THD respectivelyuWith electric current total harmonic distortion THDiData, when
Judge THDu>=5%, THDi>=5%；
Show that analysing terminal reads multifunctional meter relative harmonic content data respectively again.As certain subharmonic voltage Uh, be greater than it is humorous
WAVE VOLTAGE AMPLITUDE VALUES threshold value Uth, electric current IhAmplitude is also greater than harmonic current threshold value Ith, i.e. Uh≥Uth,Ih≥IthWhen, determine the h
Subharmonic is the big harmonic wave of aberration rate:
THh=max ({ Uh,Ih| h=1,2 ..., 63 }) >=(Uth,Ith)
Wherein, relative harmonic content is containing the harmonic wave ginseng including percent harmonic distortion, crest factor, the phone harmonic wave forms factor
Amount；H is the number that harmonic wave is distortion；THhFor h subharmonic voltage, current amplitude；UhFor h subharmonic voltage；IhIt is the h times
Harmonic current.
Such as analyze result TH5≥(Uth,Ith)、TH7≥(Uth,Ith), then the harmonic excess number filtered out is respectively h=5
It is secondary and h=7 times.
Step 2, according to overtone order h, display analysing terminal acquires electric network data collector all on the phase line
The h subharmonic voltage U arrivedh, current amplitude Ih, respectively with harmonic voltage amplitude thresholds UthWith harmonic current threshold value IthInto
Row compares, as the data U for judging the acquisition of n-th electric network data collectornh≥Uth,Inh≥IthWhen, n-th electric network data acquisition
Position where device is that place occurs for harmonic wave.Wherein, n is 1≤n≤M, one integer, UnhFor n-th electric network data collector
H subharmonic voltage；InhFor the h subharmonic current of n-th electric network data collector；
Specifically:
The overtone order h determining according to step 1 analysis, display analysing terminal adopt electric network data all on the route
The collected h subharmonic voltage U of storageh, electric current IhAmplitude, respectively with harmonic voltage amplitude thresholds UthAnd harmonic current
Threshold value IthCompare, obtain h subharmonic voltage current effective value, at the same both greater than harmonic voltage, current amplitude threshold value constitute two
Tuple sn:
sn∈{(Unh,Inh)|Unh≥Uth&&Inh≥Ith,n∈{1,2,...,M-1,M}}
Thus judge n-th collected h subharmonic voltage U of electric network data collectornh, electric current InhAmplitude, simultaneously
Meet and is both greater than harmonic voltage amplitude thresholds UthWith harmonic current threshold value Ith。
Wherein, the binary group s of h subharmonic voltage current effective value is constitutednIn n, be the acquisition of n-th electric network data
Device；&& is logical AND relationship；UnhFor the h subharmonic voltage of n-th electric network data collector；InhIt is adopted for n-th electric network data
The h subharmonic current of storage；
Such as analyze result s3≥(Uth,Ith)、s4≥(Uth,Ith), then filter out the 3rd and the 4th electric network data collector
The position at place is that place occurs for harmonic wave；
From there through snPosition where determining n-th electric network data collector is that place occurs for harmonic wave.
Step 3, the data acquired by n-th electric network data collector, calculates separately the active power for obtaining harmonic wave
Pnh, reactive power Qnh, apparent energy SnhAnd harmonic current and voltage phase angleAccording to harmonic current and voltage phase angle Value range analyzes the harmonic nature for determining the point, and determination is by inductive element resonance, capacitive element resonance
What caused Harmonics amplification, the harmonic attenuation of resistive element or active harmonics source generated.
Analyze the harmonic nature of n-th electric network data collector collection point:
1) power factor calculating is carried out to the collected data of n-th electric network data collector that step 2 determines；
By the voltage U of n-th collected h subharmonic of electric network data collectornh, electric current Inh, active-power PnhAnd
Reactive power Qnh, calculate the apparent energy S of h subharmonicnhAre as follows:
Snh=Unh×Inh (1)
Wherein, n is any one in the M platform electric network data collector of route installation, 1≤n≤M；H is time of harmonic wave
Number, 1≤h are integer；
According to fundamental wave Computing Principle, the wattful power of the h subharmonic of n-th electric network data collector collection point is respectively obtained
Rate Pnh, reactive power QnhWith apparent energy SnhAnd harmonic current angle relationship formula:
Wherein,The voltage and (n-1)th electric network data acquired for h subharmonic in n-th electric network data collector is adopted
Phase angle between the harmonic current of storage acquisition.
The function of the h subharmonic of n-th electric network data collector collection point acquisition can be calculated according to formula (2) and formula (3)
Rate factor.
Wherein, 1≤n≤M.
2) power factor is judged whether close to 0, so that it is determined that harmonic nature according to formula (4)；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage phase is ahead of current phase at this time, i.e.,Passive inductive element feature is presented, thus
Judge n-th electric network data collector collection point generate harmonic wave be inductive element participation resonance caused by Harmonics amplification,
In , && be logical AND relationship；
Harmonic current phase is ahead of voltage-phase at this time, i.e.,Passive capacitive element feature is presented, by
This judges the harmonic wave that n-th electric network data collector collection point generates for Harmonics amplification caused by capacitive element participation resonance；
3) power factor is judged whether close to 1, to determine harmonic wave attribute according to formula (4)；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage and current in phase at this time, i.e.,Resistance is presented to harmonics restraint feature, thus judges the
The harmonic wave that n platform electric network data collector collection point generates is caused by the harmonic attenuation of resistive element；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage and current direction are on the contrary, i.e. at this timePresence source harmonic source feature, thus judges n-th
Collection point where platform electric network data collector is active harmonics source.
Detailed description of the invention
Fig. 1 is the structure of distributed plesiochronous network system performance evaluation system；
Harmonic analysis method flow chart of the Fig. 2 based on distributed plesiochronous power grid measuring system.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.Implementation method of the present invention is specific as follows:
As shown in Figure 1, using the plesiochronous power grid measuring system of distribution of the invention by display analysing terminal and M platform power grid
Data collector composition, M is integer, M >=1.
At each uniline key point of M platform electric network data collector distributing installation three-phase line in platform area,
Such as photovoltaic power generation simultaneously puts net, load are larger, power electronic equipment is more etc..Electric network data collector and display analysing terminal are logical
News.
Display analysing terminal is articulated in the output end positioned at power distribution network transformer low-voltage side, reads platform area respectively and electrically believes
Breath reads the data of the electric network data collector of three-phase line in platform area by carrier wave, wired or wireless network.
The electric network data collector is connect by electric current, voltage sensor with tested measuring point power grid, and installation point is acquired
The power grid electric information at place, including fundamental voltage, electric current and direction, the electric current of each harmonic, the amplitude of voltage and wattful power
Rate and reactive power etc., and recording function is carried out to failure, have the function such as correcting time in network, carrier wave, wired or wireless network communication concurrently
Energy；
Show analysing terminal by acquisition module, wire and wireless communication interface, display terminal and number in multifunctional meter, carrier set
It is formed according to analyzer-controller.Wherein multifunctional meter is step down side three-phase electrical measuring instrument.Data analysis control is read
The data and M platform electric network data collector data of multifunctional meter are taken, and are analyzed.There are three logical for acquisition module in carrier set
Road, respectively every electric network data collector data in three-phase line in picking platform area.Display terminal can be manually entered storage M platform electricity
Geographical coordinate, photovoltaic power generation capacity, every section of line length of base load characteristic and power grid and the resistance of network data collector installation point
It is anti-.The data, analysis result of real-time display acquisition proposes harmonic wave distribution and harmonic source analysis report.
It shows that the analysing terminal foundation collected electric data of multifunctional meter is standard, the electric network data received is acquired
The collected electric data of device carries out error analysis, and analysis result is stored in display analysing terminal, analyzes for subsequent display
Each data of electric network data collector received by terminal carry out error correction.
At each uniline key point of M platform electric network data collector distributing installation three-phase line in platform area, such as photovoltaic
Electricity generation grid-connecting point, load is larger, power electronic equipment is more etc..And by the M platform electric network data collector equipment installed
Location code and put in order, be entered by hand display analysing terminal in.
Show that analysing terminal is communicated using carrier communication mode and all electric network data collectors.Display analysing terminal passes through
The single-phase output such as A phase of acquisition module in carrier set is controlled, all electric network datas being mounted in platform area on three-phase line are issued
Collector address.When showing that analysing terminal receives the electric network data collector of response, it may be determined that the electric network data collector
It is mounted in surveyed A phase line.Show that analysing terminal puts in order according to manual typing and has the electric network data of response to adopt simultaneously
Putting in order for the phase line is established in storage address.In addition the electric network data collector localization method of B, C phase line is same as above.
Display analysing terminal takes all data of electric network data collector, error correction in real time online, and will acquire number in real time
According to history comparing in the same time, need to sum respectively, be averaging according to data analysis, maximum value and minimum value calculate, protecting
In the presence of display analysing terminal, next electric network performance analysis and assessment, the data according to above-mentioned processing carry out frequency analysis, harmonic wave
Source identification and positioning, and submit frequency analysis assessment report.
As shown in Fig. 2, the present invention is based on the harmonic analysis method method and steps of distributed plesiochronous power grid measuring system such as
Under:
Step 1, display analysing terminal read multifunctional meter voltage total harmonic distortion THD respectivelyuWith electric current total harmonic distortion THDi
Data, and compared with total harmonic distortion factor permissible value, filter out exceeded percent harmonic distortion and corresponding determining overtone order h；
Step 2, according to overtone order h, display analysing terminal collects electric network data collector all on the route
H subharmonic voltage Uh, electric current IhAmplitude, respectively with harmonic voltage amplitude thresholds UthWith harmonic current threshold value IthThan
Compared with as the data U for judging the acquisition of n-th electric network data collectornh≥Uth,Inh≥IthWhen, n-th electric network data collector institute
Collection point be harmonic wave occur position, wherein UnhFor the h subharmonic voltage of n-th electric network data collector；InhFor
The h subharmonic current of n-th electric network data collector；
Step 3, the data and calculating acquired by n-th electric network data collector, respectively obtains the active power of harmonic wave
Pnh, reactive power QnhWith apparent energy SnhAnd harmonic current and voltage phase angleFoundationValue range,
It analyzes and determines that the harmonic wave is the Harmonics amplification as caused by perception, capacitive element resonance, the harmonic attenuation of resistive element still has
What source harmonic source generated.
Claims (5)
1. a kind of harmonic analysis method based on distributed plesiochronous power grid measuring system, the plesiochronous power grid of distribution is surveyed
Amount system is made of display analysing terminal and M platform electric network data collector, and M is integer, M >=1；The M platform electric network data is adopted
Storage is connect by electric current, voltage sensor with tested measuring point power grid, and the power grid electric information at measured point is acquired；Described is aobvious
Show that analysing terminal is articulated in the output end positioned at power distribution network transformer low-voltage side, reads the data and M platform power grid of its multifunctional meter
Data collector data,
It is characterized in that, the harmonic source identification and being located through display analysing terminal in real time to multifunctional meter and electric network data
The harmonic voltage U of each collection point of collector acquisitionnh, electric current InhAmplitude, phase relation are analyzed, and h subharmonic is obtained
Trend distribution and harmonic voltage, curent change rule, determine harmonic wave source position and recognize the property of harmonic source；
Steps are as follows:
Step 1 filters out exceeded percent harmonic distortion and corresponding determining overtone order h；
Step 2 judges that the position of point occurs for harmonic wave；
The harmonic nature of point occurs for step 3, analysis harmonic wave.
2. the harmonic analysis method described in accordance with the claim 1 based on distributed plesiochronous power grid measuring system, feature exist
In in the step one, display analysing terminal reads multifunctional meter voltage total harmonic distortion THD respectivelyuWith electric current total harmonic distortion
THDiData, and compared with total harmonic distortion factor permissible value, filter out exceeded percent harmonic distortion and corresponding determining overtone order h；
Specifically:
Display analysing terminal reads multifunctional meter voltage total harmonic distortion THD respectivelyuWith electric current total harmonic distortion THDiData work as judgement
THDu>=5%, THDi>=5%；
Show that analysing terminal reads multifunctional meter relative harmonic content data respectively again；As certain subharmonic voltage Uh, be greater than harmonic voltage
Amplitude thresholds Uth, electric current IhAmplitude is also greater than harmonic current threshold value Ith, i.e. Uh≥Uth,Ih≥IthWhen, determine the h subharmonic
For the big harmonic wave of aberration rate:
THh=max ({ Uh,Ih| h=1,2 ..., 63 }) >=(Uth,Ith)
Wherein, relative harmonic content is to contain the Harmonic Parameters including percent harmonic distortion, crest factor, the phone harmonic wave forms factor；h
It is the number of distortion for harmonic wave；THhFor h subharmonic voltage, current amplitude；UhFor h subharmonic voltage；IhFor h subharmonic
Electric current；
Analysis result is TH5≥(Uth,Ith)、TH7≥(Uth,Ith), then the harmonic excess number filtered out is respectively h=5 times and h
=7 times.
3. the harmonic analysis method described in accordance with the claim 1 based on distributed plesiochronous power grid measuring system, feature exist
In in the step two, foundation overtone order h shows analysing terminal by electric network data collector all on the phase line
Collected h subharmonic voltage Uh, current amplitude Ih, respectively with harmonic voltage amplitude thresholds UthWith harmonic current threshold value
IthIt is compared, as the data U for judging the acquisition of n-th electric network data collectornh≥Uth,Inh≥IthWhen, n-th electric network data
Position where collector is that place occurs for harmonic wave；Wherein, n is 1≤n≤M, one integer, UnhIt is adopted for n-th electric network data
The h subharmonic voltage of storage；InhFor the h subharmonic current of n-th electric network data collector；
Specifically:
The overtone order h determining according to step 1 analysis, shows analysing terminal by electric network data collector all on the route
Collected h subharmonic voltage Uh, electric current IhAmplitude, respectively with harmonic voltage amplitude thresholds UthWith harmonic current threshold value
IthCompare, obtain h subharmonic voltage current effective value, while the both greater than binary group that constitutes of harmonic voltage, current amplitude threshold value
sn:
sn∈{(Unh,Inh)|Unh≥Uth&&Inh≥Ith,n∈{1,2,...,M-1,M}}
Thus judge n-th collected h subharmonic voltage U of electric network data collectornh, electric current InhAmplitude meets simultaneously
Both greater than harmonic voltage amplitude thresholds UthWith harmonic current threshold value Ith；
Wherein, the binary group s of h subharmonic voltage current effective value is constitutednIn n, be n-th electric network data collector；&& is to patrol
Volume and relationship；UnhFor the h subharmonic voltage of n-th electric network data collector；InhFor the h of n-th electric network data collector
Subharmonic current；
Analyze result s3≥(Uth,Ith)、s4≥(Uth,Ith), then where filtering out the 3rd and the 4th electric network data collector
Position is that place occurs for harmonic wave；
From there through snPosition where determining n-th electric network data collector is that place occurs for harmonic wave.
4. the harmonic analysis method described in accordance with the claim 1 based on distributed plesiochronous power grid measuring system, feature exist
In in the step three, the data acquired by n-th electric network data collector calculate separately the wattful power for obtaining harmonic wave
Rate Pnh, reactive power Qnh, apparent energy SnhAnd harmonic current and voltage phase angleAccording to harmonic current and voltage phase angle
'sValue range analyzes the harmonic nature for determining the point, determines that the harmonic wave is by inductive element resonance, holds
Property element resonance caused by Harmonics amplification, what the harmonic attenuation of resistive element or active harmonics source generated.
5. the harmonic analysis method according to claim 4 based on distributed plesiochronous power grid measuring system, feature exist
In the harmonic nature of n-th electric network data collector collection point of analysis:
1) power factor calculating is carried out to the collected data of n-th electric network data collector that step 2 determines；
By the voltage U of n-th collected h subharmonic of electric network data collectornh, electric current Inh, active-power PnhAnd it is idle
Power Qnh, calculate the apparent energy S of h subharmonicnhAre as follows:
Snh=Unh×Inh (1)
Wherein, n is any one in 1~M platform electric network data collector of route installation, 1≤n≤M；H is time of harmonic wave
Number, 1≤h are integer；
According to fundamental wave Computing Principle, the active power of the h subharmonic of n-th electric network data collector collection point is respectively obtained
Pnh, reactive power QnhWith apparent energy SnhAnd harmonic current angle relationship formula:
Wherein,The voltage and (n-1)th electric network data collector acquired for h subharmonic in n-th electric network data collector
Phase angle between the harmonic current of acquisition；
The power factor of the h subharmonic of n-th electric network data collector collection point acquisition is calculated according to formula (2) and formula (3)；
Wherein, 1≤n≤M；
2) power factor is judged whether close to 0, so that it is determined that harmonic nature according to formula (4)；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage phase is ahead of current phase at this time, i.e.,Passive inductive element feature is presented, thus judges
The harmonic wave that n-th electric network data collector collection point generates is that Harmonics amplification ,Qi Zhong, && caused by inductive element participation resonance is
Logical AND relationship；
Harmonic current phase is ahead of voltage-phase at this time, i.e.,Passive capacitive element feature is presented, thus sentences
The harmonic wave that the collection point of disconnected n-th electric network data collector generates is that capacitive element participates in Harmonics amplification caused by resonance；
3) power factor is judged whether close to 1, to determine harmonic wave attribute according to formula (4)；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage and current in phase at this time, i.e.,Resistance is presented to harmonics restraint feature, thus judges n-th electricity
The harmonic wave that collection point where network data collector generates is caused by the harmonic attenuation of resistive element；
When the data of n-th electric network data collector acquisition are shown that analysing terminal is calculated:
Harmonic voltage and current direction are on the contrary, i.e. at this timeThus presence source harmonic source feature judges n-th electricity
Collection point where network data collector is active harmonics source.
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