CN108169585B - One kind prejudging other division of responsibiltiy engineering method based on harmonic source - Google Patents
One kind prejudging other division of responsibiltiy engineering method based on harmonic source Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to power system and automation technologies, disclose a kind of based on the other division of responsibiltiy engineering method of harmonic source anticipation.The present invention carries out assessment judgement to the amplitude and fluctuation situation of harmonic current sampled value, chooses certain one or more load as credible solution, calculates harmonic contributions using complex field least square method, and after verifying and amendment, harmonic contributions are calculated to other whole loads.The present invention can effectively calculate under same bus the harmonic contributions of whole feeder lines, and exclude harmonic data fluctuation situation it is undesirable when, caused by interference or erroneous judgement.
Description
Technical field
The invention belongs to power system and automation technology, it is specifically related to harmonic contributions in power quality analysis
Share.
Background technique
Existing harmonic contributions share function and generally use " non-intervention method " data processing algorithm to estimate the duty of concern bus
Appoint distribution, i.e., concern bus harmonic voltage obtained by electric energy quality measurement device and investigate the sampled value of Load harmonic electric current,
It is supported using following Processing Algorithm such as least square method (such as Chinese patent application document notification number CN106443285A), weighting
(such as Chinese patent application document is announced for vector machine (such as Chinese patent application document notification number CN105807136A) and Waveform Matching
Number CN106019026A) the methods of estimation harmonic wave equivalent impedance and background harmonic voltage, and then calculate the harmonic contributions of the load.
But these methods are more demanding to the wave characteristic of sampled value, pay close attention to not enough, easily for fluctuating other less obvious loads
Algorithm failure occur leads to results abnormity, can not effectively assess all Load harmonic responsibilities.
Summary of the invention
Object of the present invention is to: it is insufficient, humorous with all Load harmonic responsibility comparisons in bus downstream in existing method in order to overcome
Wave data samples fluctuate unobvious the defects of causing algorithm to fail or judge by accident, provide a kind of other based on the anticipation of harmonic source
Division of responsibiltiy engineering method.
Specifically, the present invention adopts the following technical solutions realize, comprising the following steps:
1) harmonic data of the Fast Fourier Transform (FFT) acquisition including each feeder line harmonic current is carried out according to measured data；
2) according to the amplitude mean value and standard deviation of each feeder line harmonic current, quantify each feeder line harmonic current, with whole feeder lines
Weight is calculated on the basis of above-mentioned two index of the sum of harmonic current, wherein according to each feeder line harmonic current mean value and whole
The ratio of the sum of feeder line harmonic current obtains the amplitude weighted value of each feeder line harmonic wave, according to each feeder line harmonic current standard difference with
The ratio of the sum of whole feeder line harmonic current standard differences obtains the fluctuation weighted value of each feeder line harmonic wave；
The amplitude weighted value of all feeder line harmonic waves constitutes amplitude weight, and the fluctuation weighted value of all feeder line harmonic waves is constituted
Fluctuate weight；
3) differentiate that feelings are fluctuated in harmonic source and background harmonics source in advance according to the distribution situation of amplitude weight and fluctuation weight
Condition: if amplitude weight and fluctuation weight are " leading clear ", and the maximum value in every class weight belongs to same load and is
Single leading harmonic source situation, is multiple dominant harmonic source situation if being not belonging to same load；If amplitude weight is " leading clear "
And fluctuate weight and fluctuate weight for " distribution is averagely " for " being distributed average " or amplitude weight as " leading to define ", then it is single dominate
Harmonic source situation；If amplitude weight and fluctuation weight are judged as " distribution average ", for there are multiple average harmonic sources or
It is acutely interfered by background harmonics source；
Differentiate that result is single leading harmonic source situation and fluctuation weight is " leading clear " or multiple dominant harmonic source feelings as pre-
Condition, then by fluctuate weight in maximum value belonging to load be judged to credible solution in advance, otherwise by except fluctuation weight level off to 0 load
It screens out, remaining load is judged to credible solution in advance；
Harmonic impedance, background harmonic voltage and the harmonic contributions of all credible solutions are calculated using compound linear least square method；
If 4) differentiate that result is single leading harmonic source situation and fluctuation weight is " leading clear " as pre- in step 3), into
Enter step 5), the harmonic impedance otherwise calculated by conventional wave momentum method be greater than compound linear least square method harmonic impedance this
Property verifies credible solution, if all solutions are insincere, it is determined that is background side harmonic source containing acutely interference；
5) basis passes through the harmonic contributions result of the credible solution of verifying and its ratio of amplitude and other load amplitudes, according to
Deng than relationship, other Load harmonic responsibilities are calculated, while excluding the harmonic contributions total value as caused by data exception and overflowing situation,
Amendment harmonic contributions are distributed according to amplitude proportion, guarantee its total value less than 100%.
Above-mentioned technical proposal furthermore, in the step 3), differentiates two class weight distributions by reference to limit threshold
" distribution is average " is in " leading clear ", for every class weight, if maximum value therein and referring to boundary threshold
The product of value is still greater than second largest value therein, then is judged to dominating clearly, otherwise average to be distributed.
Furthermore, the reference limit threshold is 0.75 to above-mentioned technical proposal.
Above-mentioned technical proposal furthermore, in the step 5), when responsibility total value is greater than 100%, forces to limit responsibility
The total value upper limit is 50%.
Beneficial effects of the present invention are as follows: the present invention is commented by the amplitude to harmonic current sampled value with fluctuation situation
Estimate judgement, chooses certain one or more load as credible solution, harmonic contributions are calculated using complex field least square method, by verifying
After amendment, harmonic contributions are calculated to other whole loads.The present invention can effectively calculate the harmonic wave of whole feeder lines under same bus
Responsibility, and exclude harmonic data fluctuation situation it is undesirable when, caused by interference or erroneous judgement.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is the detailed process figure of the method for the present invention step 3-5.
Specific embodiment
Below with reference to embodiment and referring to attached drawing, present invention is further described in detail.
Embodiment 1:
One embodiment of the present of invention, for one kind, implementation step is as shown in Figure 1.
Referring to Fig. 1, step 1 is described in Fig. 1, and it is humorous to carry out Fast Fourier Transform (FFT) (FFT) acquisition according to measured data
Wave number evidence includes points of common connection (PCC) harmonic voltage and each feeder line harmonic current；
Step 2 describes in Fig. 1, and according to the amplitude mean value and standard deviation of each feeder line harmonic current, it is humorous to quantify each feeder line
Wave electric current calculates weight on the basis of above-mentioned two index of the sum of whole feeder line harmonic currents, wherein according to each feeder line harmonic wave
The ratio of the sum of current amplitude mean value and whole feeder line harmonic current obtains the amplitude weighted value of each feeder line harmonic wave, according to each feedback
The ratio of the sum of line harmonics current standard deviation and whole feeder line harmonic current standard difference obtains the fluctuation weighted value of each feeder line harmonic wave.Institute
The amplitude weighted value of some feeder line harmonic waves constitutes amplitude weight, and the fluctuation weighted value of all feeder line harmonic waves constitutes fluctuation power
Weight.
Step 3 describes in Fig. 1, differentiates harmonic source and background harmonics source fluctuation situation in advance according to weight, specifically
Differentiation process referring to fig. 2, criterion is to differentiate two class weights (i.e. amplitude weight and fluctuation weight) by reference to limit threshold
Distribution is in " distribution is average " in " leading clear ".Such as set with reference to limit threshold as 0.75, then for every class weight and
Speech, if the 75% of maximum value therein is still greater than second largest value therein, be determined as it is leading clear, it is otherwise average to be distributed.It is aobvious
So, threshold value setting is smaller, and division is more obvious.
Situation 1: if amplitude weight and fluctuation weight are " leading clear ", and the maximum value in every class weight belongs to together
One load is then single leading harmonic source situation, is multiple dominant harmonic source situation if being not belonging to same load；
Situation 2: if amplitude weight fluctuates for " leading clear ", weight is " distribution is averagely " or amplitude weight is " distribution
It is average " and fluctuate weight as " leading clear ", then it is single leading harmonic source situation；
Situation 3: if amplitude weight and fluctuation weight are judged as " distribution is average ", for there are multiple average harmonic sources
Or two kinds of situations are acutely interfered by background harmonics source.Particularly belonging to any situation need to further be judged by subsequent step.
According to above-mentioned pre- differentiation as a result, being " dominating clear " and mostly main for fluctuation weight in single leading harmonic source situation
Harmonic source situation is led, since the data fluctuations characteristic that fluctuation weight dominates specific load is obvious, arithmetic result is good, can prejudge
For credible solution, i.e., load belonging to the maximum value fluctuated in weight is judged to credible solution in advance.For other situations, due to data wave
Emotionally the unobvious i.e. standard deviation of condition level off to 0 load algorithm it is vulnerable, should screen out the load data, and level off to 0 for non-
Load as credible solution.Using compound linear least square method calculate the harmonic impedances of all credible solutions, background harmonic voltage and
Harmonic contributions.Compound linear least square method is calculating harmonic impedance, background harmonic voltage and harmonic contributions commonly used in the art
One of method, such as seen, " harmonic contributions based on compound linear least square method quantitatively divide " (Jia Xiufang is write, Chinese electrical engineering
Journal the 4th phase of volume 33 in 2013) etc. documents.
Step 4 describes in Fig. 1, is greater than compound linear least square method by the harmonic impedance that conventional wave momentum method calculates
Harmonic impedance this property, credible solution is verified, wherein can skip the step if single leading harmonic source situation directly thinks phase
The credible solution of the credible solution credible result answered, the selection of other situations need to be verified.If all solutions are insincere, it is determined that background
Side harmonic source is containing acutely interference.
Step 5 describes in Fig. 1, according to the harmonic contributions result (such as 30%) and its amplitude of the credible solution by verifying
The ratio (such as 2:1) of (such as 10A) and other load amplitudes (such as 5A) calculate other Load harmonic responsibilities (such as according to equal than relationship
30%/2=15%), while the spilling situation of the harmonic contributions total value as caused by data exception is excluded, is repaired according to amplitude proportion distribution
Positive harmonic contributions guarantee its total value less than 100%, i.e., when responsibility total value is greater than 100%, are forced to limit responsibility according to engineering experience
The total value upper limit is 50%, and assurance function result is normal.Why it is set as 50%, is since background harmonics source acts on, it is believed that background
Side responsibility and load side responsibility are suitable, therefore the load side responsibility total value upper limit is limited to 50%.
Although the present invention has been described by way of example and in terms of the preferred embodiments, embodiment is not for the purpose of limiting the invention.Not
It is detached from the spirit and scope of the present invention, any equivalent change or retouch done also belongs to the protection scope of the present invention.Cause
This protection scope of the present invention should be based on the content defined in the claims of this application.
Claims (3)
1. one kind prejudges other division of responsibiltiy engineering method based on harmonic source, it is characterised in that: the following steps are included:
1) harmonic data of the Fast Fourier Transform (FFT) acquisition including each feeder line harmonic current is carried out according to measured data；
2) according to the amplitude mean value and standard deviation of each feeder line harmonic current, quantify each feeder line harmonic current, with whole feeder line harmonic waves
Weight is calculated on the basis of above-mentioned two index of the sum of electric current, wherein according to each feeder line harmonic current mean value and whole feeder lines
The ratio of the sum of harmonic current obtains the amplitude weighted value of each feeder line harmonic wave, according to each feeder line harmonic current standard difference and whole
The ratio of the sum of feeder line harmonic current standard difference obtains the fluctuation weighted value of each feeder line harmonic wave；
The amplitude weighted value of all feeder line harmonic waves constitutes amplitude weight, and the fluctuation weighted value of all feeder line harmonic waves constitutes fluctuation
Weight；
3) differentiate that situation is fluctuated in harmonic source and background harmonics source in advance according to the distribution situation of amplitude weight and fluctuation weight: if
Amplitude weight and fluctuation weight are " leading clear ", and it is single leading that the maximum value in every class weight, which belongs to same load then,
Harmonic source situation is multiple dominant harmonic source situation if being not belonging to same load；If amplitude weight fluctuates for " leading clear "
Weight is " being distributed average " or amplitude weight is " distribution is average " and fluctuates weight as " leading clear ", then is single leading harmonic source
Situation；If amplitude weight and fluctuation weight are judged as " distribution average ", there are multiple average harmonic sources or to be carried on the back
Scape harmonic source acutely interferes；Differentiate that two class weight distributions are in " leading clear " and are in " distribution by reference to limit threshold
It is average ", for every class weight, if maximum value therein and the product with reference to limit threshold are still greater than second largest value therein,
Then it is judged to dominating and defines, it is otherwise average to be distributed；
As differentiated in advance, result is single harmonic source situation and fluctuation weight dominated for " leading clear " or multiple dominant harmonic source situation, then
Load belonging to the maximum value fluctuated in weight is judged to credible solution in advance, otherwise will be screened out except fluctuation weight levels off to 0 load,
Remaining load is judged to credible solution in advance；
Harmonic impedance, background harmonic voltage and the harmonic contributions of all credible solutions are calculated using compound linear least square method；
If 4) differentiate that result is single leading harmonic source situation and fluctuation weight is " leading clear " as pre- in step 3), enter step
It is rapid 5), the harmonic impedance otherwise calculated by conventional wave momentum method is greater than this property of the harmonic impedance of compound linear least square method
Matter verifies credible solution, if all solutions are insincere, it is determined that is background side harmonic source containing acutely interference；
5) according to the harmonic contributions result of the credible solution by verifying and its ratio of amplitude and other load amplitudes, according to equal ratios
Relationship calculates other Load harmonic responsibilities, while excluding the harmonic contributions total value as caused by data exception and overflowing situation, according to
Amplitude proportion distribution amendment harmonic contributions, guarantee its total value less than 100%.
2. according to claim 1 prejudge other division of responsibiltiy engineering method based on harmonic source, which is characterized in that institute
The reference limit threshold for stating step 3) is 0.75.
3. according to claim 1 prejudge other division of responsibiltiy engineering method based on harmonic source, which is characterized in that institute
It states in step 5), when responsibility total value is greater than 100%, pressure limits the responsibility total value upper limit as 50%.
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