CN106093571A - The harmonic wave source tracing method that user side is main harmonic source is judged based on what impedance retrained - Google Patents
The harmonic wave source tracing method that user side is main harmonic source is judged based on what impedance retrained Download PDFInfo
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Abstract
The invention provides a kind of based on impedance constraint judge the harmonic wave source tracing method that user side is main harmonic source, including: to occurring that at the points of common connection PCC of harmonic pollution, voltage and current waveform is acquired, find out content higher and need to carry out the overtone order that harmonic wave is traced to the source.Show that both sides are to harmonic voltage contribution degree size at PCC；According to both sides impedance inherent feature, simplify the strict inequality condition judging to need to meet when user side is major harmonic source；By PCC harmonic voltage and harmonic wave current measurement information, can directly or indirectly obtain the whole parameters in inequality constraints condition；At character according to both sides impedance and PCC, the scope of harmonic voltage electric current angle, selecting corresponding inequality constraints condition, if meeting inequality constraints condition, then can determine whether that user side is major harmonic source.The method can be used for solving judging that whether user side at points of common connection is that the harmonic wave in major harmonic source is traced to the source problem, has stronger engineering practicability.
Description
Technical field
The invention belongs to electric energy quality harmonic analysis field, particularly relate to utilize points of common connection Monitoring Data to judge user
Side is the harmonic wave source tracing method in major harmonic source.
Background technology
Quality of power supply interference source accesses the power quality problem of electrical network and is always in power planning the major issue paid close attention to.Early
The disturbance load of phase is relatively simple, and along with the development of technology, the most more complicated nonlinear-load accesses, and adds the quality of power supply and does
Disturb complexity and the polytropy in source, make the harmonic pollution problems in power system become day by day serious, to the economical operation of electrical network
And the safety utilization of electric power of user causes strong influence.
Quality of power supply interference is carried out Source Tracing, and determines that each pollution sources of electrical energy quality is to improve electric energy matter further
The premise of buret reason.Contribute to solving to pollute indefinite problem for electricity consumption both sides' quality of power supply, electrical network is realized quality supply
Significant.A difficult point in always harmonic study and harmonic wave is traced to the source: one is due to the harmonic wave of electric network element parameter
Dispersibility, can affect electric network element computational accuracy under harmonic frequency；Two is owing to system side harmonic source size can not be direct
Measure, therefore, main harmonic source is reviewed and becomes difficult point.
When judging PCC (points of common connection, Point of Common Coupling) major harmonic source, place, system side is humorous
The calculating of natural impedance is crucial.Owing at PCC, harmonic voltage and harmonic current can be directly obtained by measurement.System side harmonic wave
The whether accurate of impedance estimation the most just determines the accuracy that harmonic wave is traced to the source.When the method using " intervention formula " comes estimating system side
During harmonic impedance, utilize to system harmonic/m-Acetyl chlorophosphonazo electric current, break-make branch road (such as: capacitance compensation branch road) or start and stop negative
The additional disturbance quantity that the artificial mode such as lotus produces, carrys out estimating system side harmonic impedance, and the estimation result obtained is the most reliable.But
This disturbance is likely to have a negative impact the properly functioning of system, it addition, in a lot of occasions, not existing can be with switching
Electrical equipment and equipment.Therefore, frequently with " non-intervention formula " method in engineering, the method is by measuring harmonic voltage at PCC
Judge harmonic impedance with harmonic current and then determine that major harmonic source acts on size.Typical method has mensuration, the Return Law of fluctuation.
The effective premise of these methods is the sample finding background harmonics constant.Harmonic voltage at PCC is by user side and system
Side both sides together decide on, and in practical power systems, the harmonic current of user side and system side fluctuates the most simultaneously, PCC
The fluctuation of place's harmonic voltage is also together decided on by user side and system side both sides.Therefore, in system background harmonic fluctuations relatively
Time big, the result of calculation of conventional " non-intervention formula " method often can not meet the requirement of engineering precision.Random independent vector
It is humorous that the methods such as method, Maximum Likelihood Estimation Method, isolated component method, support vector machine, Bayes eliminate background to a certain extent
The impact that wave-wave is dynamic, but said method does not has substantial change, is all based on the basis of user stresses to want harmonic source,
Judging its harmonic contributions size, at PCC, harmonic wave is primarily not user-side harmonic when causing, and this kind of method can not obtain satisfied
Result.Network Harmonic Impedances has some inherent characters, the most both may be in perception, it is also possible in capacitive, but many
In perception under said conditions.And system impedance and user's impedance relative size almost determine.The generally estimation phase of impedance magnitude
The estimation of specific impedance angle is the most accurate.
To this end, the inventive method give a kind of based on impedance constraint judge that the harmonic wave that user side is main harmonic source is traced to the source
Method, the method is set up at equivalent model, points of common connection is chosen the easiest, with other tradition sides with the aspect such as DATA REASONING
Method has compared solving speed faster, it is not necessary to accurate model ginseng needed for building complicated phantom and phantom
Count, and method need not be difficult to calculated system side harmonic impedance angle, it is judged that parameter required in condition is at PCC
Harmonic voltage and the amplitude of harmonic current and angle and system side harmonic impedance amplitude, all parameters all facilitate acquisition, can
Directly or indirectly obtain according to measurement data, there is stronger engineering practicability.This method can accurately judge that user side is PCC
The major harmonic source at place.
Summary of the invention
The technical problem to be solved is the most just to judge that user side is major harmonic source.For system side and use
Side, family harmonic source size can not difficult point measured directly, obtain one and utilize measurement data at points of common connection i.e. can accurately sentence
Disconnected user side is the harmonic wave source tracing method in major harmonic source.
The technical solution adopted in the present invention is:
Judge, based on what impedance retrained, the harmonic wave source tracing method that user side is main harmonic source, comprise the steps:
Step one, with quality of power supply oscillograph to voltage and current waveform at the points of common connection PCC of harmonic pollution occurs
It is acquired, and utilizes fast Fourier transform to obtain content or the size of each harmonic, find out the overtone order that content is higher.
Step 2, promise is utilized to pause the equivalent circuit analysis model as system side and user-side harmonic source, according to Kiel suddenly
Husband's current law obtains:WithWhereinIt is respectively system side and user side equivalent harmonic wave electric current
Source, Zu、ZcIt is respectively system side and the equivalent harmonic wave impedance of user side,It is respectively h time (overtone order) recorded at PCC
Harmonic voltage and harmonic current.With harmonic voltage for reference phasor,Then harmonic currentV
Lying prostrate for voltage unit, A is current unit peace,For harmonic voltage and the angle of electric current,Amplitude be Upcc,Amplitude be
Ipcc；Additionally,Amplitude be Iu,Amplitude be Ic, ZuAmplitude be | Zu|, ZcAmplitude be | Zc|。
Step 3, according to voltage vector principle of stacking, harmonic voltage at PCC is decomposed, obtains both sides to harmonic wave at PCC
Voltage distortion contribution degree size.User side be the sufficient and necessary condition in major harmonic source be Ic>Iu, it is equivalent to Ic 2-Iu 2> 0, with harmonic wave
Voltage x current angleAnd system side harmonic impedance angle αuWith user-side harmonic impedance angle αcFor independent variable, and according toWithTable
Reaching formula, by squared for its mould length, formula is deformed into:With
Step 4, according to I in step 3u 2And Ic 2Expression formula can obtain Ic 2-Iu 2Expression formula
By on the right of judgment expression more than zero, i.e.
Can be as the condition judging that user side is major harmonic source, if having
Then can determine whether that user side is major harmonic source.
Step 5, because being difficult to the impedance parameter condition that obtains making inequality set up, so needs according to impedance property and
The difference measuring angle discusses in detail and classifies derivation.It is commonly used to judge the harmonic wave active power of major harmonic source position in engineering
Direction method, it is judged that when user side is major harmonic source, at PCC, harmonic voltage electric current angle is at second and third quadrant (90 °, 270 °)
Scope.
Situation 1, system side and the impedance of user side are all perception: when measuring the angle obtainedWhen the second quadrant, have
In formula: the ratio k of both sides impedance magnitude=| Zc|/|Zu|.Because user-side harmonic modulus of impedance length is humorous more than system side
Natural impedance mould length (| Zc|>|Zu|), so simplifyingBecause both sides impedance is all perception, αuAnd αcBelong to
In (0 °, 90 °) scope, the cosine term perseverance on the right of Rule of judgment formula after simplification is negative, and on the right of inequality, perseverance is just.
Rule of judgment after simplification is not directly related to the multiple proportion of both sides impedance, further research both sides impedance multiple k
Change is to angleThe impact of effective range, can be along with the increase of k value, angleEffective range quickly converge on simplification after
Rule of judgment, and no matter what value k takes, and the judged result of the Rule of judgment after simplification is positioned at the interval of correct result forever
In.
Due in Practical Project, it is difficult to obtain impedance angle αuExact value, for eliminate impedance angle impact, by humorous at PCC
Wave voltage electric current angleIt is divided into the second quadrant (90 °, 135 °) and (135 °, 270 °) two regions to discuss.
1. angleIt is positioned at the second quadrant (90 °, 135 °) region, as system side impedance angle αuAny for (0 °, 90 °) scope
During value,Minima beCan obtain,2. angleIt is positioned at the second quadrant
(135 °, 180 °) region, as system side impedance angle αuDuring for (0 °, 90 °) scope arbitrary value,Minima beCan obtain,
WithWithAs Rule of judgment: work as angleBe positioned at the second quadrant (90 °,
135 °) region, if measurement data meets inequality at PCCCondition, or work as angleIt is positioned at the second quadrant
(135 °, 180 °) region, if measurement data meets inequality at PCCCondition time, it can be determined that user side is
Major harmonic source.
In Rule of judgment, in addition to harmonic voltage current amplitude and angle thereof are measured value, in addition it is also necessary to known system side
Harmonic impedance amplitude, in harmonic contributions partition problem, existing multiple method can be according to the harmonic voltage current measurement at PCC
Value is calculated system side harmonic impedance amplitude, it is judged that four amounts in condition all directly or indirectly can obtain, more by measuring
It is easy to practical engineering application.
Situation 2, when system side harmonic impedance and user-side harmonic impedance are capacitive:
WhenAt third quadrant and system side harmonic impedance ZuWith user-side harmonic impedance ZcDuring for capacitive, derivation is with upper
State similar, all interval border values and ZuAnd ZcIt is all perception and there is at 180 ° mirror symmetry, and Rule of judgment is constant.That is:
Work as angleIt is positioned at third quadrant (225 °, 270 °) region, if measurement data meets inequality at PCCBar
Part, or work as angleIt is positioned at third quadrant (180 °, 225 °) region, if measurement data meets inequality at PCCCondition time, it can be determined that user side is major harmonic source.
Step 6, to judging that analysis that user side is major harmonic source understands, at PCC harmonic wave active power direction by with
During pointing system side, side, family, it is impossible to directly judge that user side is major harmonic source, also need according to impedance property and harmonic voltage electricity
Various boundary conditions corresponding to flow measurement angle determines whether, method is concluded (| Zc|>|Zu|), see table:
Judge that user side is major harmonic source
The inventive method only studies the situation that both sides impedance property is identical, about the situation that character is different, so bad that to send as an envoy to
The impedance constraints that harmonic wave active power direction method is suitable for, the condition drawn is more complicated, is not easy to practical engineering application.
The inventive method is set up at equivalent model, points of common connection is chosen the easiest, with it with the aspect such as DATA REASONING
His traditional method has compared solving speed faster, it is not necessary to accurate needed for building complicated phantom and phantom
Model parameter, and method need not be difficult to calculated system side harmonic impedance angle, it is judged that and in condition, all parameters are all only
Need to directly or indirectly obtain according to measurement data, there is stronger engineering practicability.
Accompanying drawing explanation
Fig. 1 is to judge the method flow diagram that user side is major harmonic source；
Fig. 2 is system side and user-side harmonic source equivalent circuit figure；
Fig. 3 is the impact analysis trendgram of impedance multiple value.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is judged being embodied as of the harmonic wave source tracing method that user side is major harmonic source
Mode is described in detail.
It is embodied as step as follows:
Step one, with quality of power supply oscillograph to voltage and current waveform at the points of common connection PCC of harmonic pollution occurs
It is acquired, and utilizes fast Fourier transform to obtain content or the size of each harmonic, find out the overtone order that content is higher.
Step 2, the promise shown in Fig. 2 is utilized to pause the equivalent circuit analysis model as system side and user-side harmonic source, root
Obtain according to Kirchhoff's current law (KCL):
WhereinIt is respectively system side and user side equivalent harmonic wave current source, Zu、ZcIt is respectively system side and user side
Equivalent harmonic wave impedance,It is respectively the h subharmonic voltage and harmonic current recorded at PCC.With harmonic voltage for reference to phase
Amount,Then harmonic current For harmonic voltage and the angle of electric current,Amplitude be Upcc,Amplitude be Ipcc,Amplitude be Iu,Amplitude be Ic, ZuAmplitude be | Zu|, ZcAmplitude be | Zc|。
Step 3, according to voltage vector principle of stacking, harmonic voltage at PCC is decomposed, obtains both sides to humorous at PCC
Wave voltage distortion contribution degree size.User side be the sufficient and necessary condition in major harmonic source be Ic>Iu, it is equivalent to Ic 2-Iu 2> 0, with
Harmonic voltage electric current angleAnd harmonic impedance angle, both sides is independent variable, and according toWithExpression formula, its mould length is asked flat
Side, formula is deformed into
Wherein, αuFor system side impedance angle, αcFor user side impedance angle.
Step 4, according to formula (3) and formula (2), subtracting formula (3) with formula (2) can obtain
By judgment formula (4) the right more than zero, can be used as judging the condition that user side is major harmonic source, and to sentencing
Broken strip part abbreviation, if having
Then can determine whether that user side is major harmonic source.
Step 5, because being difficult to the impedance parameter condition that obtains making inequality set up, so needs according to impedance property and
The difference measuring angle discusses in detail and classifies derivation.It is commonly used to judge the harmonic wave active power of major harmonic source position in engineering
Direction method, it is judged that when user side is major harmonic source, at PCC, harmonic voltage electric current angle is at second and third quadrant (90 °, 270 °)
Scope.
Step 6, system side and the impedance of user side are all perception: when measuring the angle obtainedWhen the second quadrant, have
In formula: the ratio k of both sides impedance magnitude=| Zc|/|Zu|.Because user-side harmonic modulus of impedance length is humorous more than system side
Natural impedance mould length (| Zc|>|Zu|), so simplifying
Because both sides impedance is all perception, αuAnd αcBelong to (0 °, 90 °) scope, so the simplification Rule of judgment in formula (7)
Cosine term perseverance on the right of formula is negative, and on the right of inequality, perseverance is just.
Step 7, formula (7) are not directly related to the multiple proportion of both sides impedance, need research both sides impedance times further
Number k changes angleThe impact of effective range.Design and simulation example, as a example by both sides impedance is all perception, for different impedances
Multiple value, the influence degree that research the inventive method is changed by both sides impedance multiple.Emulating many group parameters, its result is equal
There is identical rule, Fig. 3 be a certain in the case of the simulation result that changes with k value of effective range.Along with the increase of k value, angle's
Effective range quickly converges on the scope of formula (7), and no matter what value k takes, and the judged result of formula (7) is positioned at correctly forever
In the interval of result, from the figure 3, it may be seen that the subset of result when the judged result of the inventive method is to consider k value change, this is described
Bright method acquired results is correct.
Step 8, due in Practical Project, it is difficult to obtain impedance angle αuExact value, for eliminate formula (7) middle impedance angle
Impact, by harmonic voltage electric current angle at PCCIt is divided into the second quadrant (90 °, 135 °) and (135 °, 270 °) two regions to beg for
Regional Economy.
1. angleIt is positioned at the second quadrant (90 °, 135 °) region, as system side impedance angle αuAny for (0 °, 90 °) scope
During value,Minima beObtained by formula (7)
2. angleIt is positioned at the second quadrant (135 °, 180 °) region, as system side impedance angle αuAny for (0 °, 90 °) scope
During value,Minima beObtained by formula (7)
Step 9, utilize formula (8) and formula (9), work as angleIt is positioned at the second quadrant (90 °, 135 °) region, if at PCC
Measurement data meets the inequality condition of formula (8), or works as angleIt is positioned at the second quadrant (135 °, 180 °) region, if at PCC
When measurement data meets the inequality condition of formula (9), it can be determined that user side is major harmonic source.
In step 10, formula (8) and formula (9), in addition to harmonic voltage current amplitude and angle thereof are measured value, also
Needing known system side harmonic impedance amplitude, in harmonic contributions partition problem, existing multiple method can humorous according at PCC
Four amounts that wave voltage current measurement value is calculated in system side harmonic impedance amplitude, formula (8) and formula (9) all can be passed through
Measure and directly or indirectly obtain, practical engineering application of being more convenient for.
Step 11, when system side harmonic impedance and user-side harmonic impedance are capacitive:
WhenAt third quadrant and system side harmonic impedance ZuWith user-side harmonic impedance ZcDuring for capacitive, derivation is with upper
State similar, equally obtain formula (7).All interval border values and ZuAnd ZcIt is all perception, at 180 °, there is specular
Property, and Rule of judgment is constant.I.e. work as angleIt is positioned at third quadrant (225 °, 270 °) region, if measurement data meets public affairs at PCC
The inequality condition of formula (8), or work as angleIt is positioned at third quadrant (180 °, 225 °) region, if measurement data meets public affairs at PCC
During the inequality condition of formula (9), it can be determined that user side is major harmonic source.
Step 12, to judging that analysis that user side is major harmonic source understands, at PCC harmonic wave active power direction by
During pointing system side, user side, it is impossible to directly judge that user side is major harmonic source, also need according to impedance property and harmonic voltage
Various boundary conditions corresponding to current measurement angle determines whether:
1. both sides harmonic impedance is all perception: work as angleIt is positioned at the second quadrant (90 °, 135 °) region, if measuring at PCC
Data meet the inequality condition of formula (8), or work as angleIt is positioned at the second quadrant (135 °, 180 °) region, if measuring at PCC
When data meet the inequality condition of formula (9), it can be determined that user side is major harmonic source.
2. both sides harmonic impedance is all capacitive: work as angleIt is positioned at third quadrant (225 °, 270 °) region, if measuring at PCC
Data meet the inequality condition of formula (8), or work as angleIt is positioned at third quadrant (180 °, 225 °) region, if measuring at PCC
When data meet the inequality condition of formula (9), it can be determined that user side is major harmonic source.
And method is concluded (| Zc|>|Zu|), see table:
Table 1. judges that user side is major harmonic source
Judge the method flow diagram that user side is major harmonic source, see Fig. 1.Method equivalent model set up, commonly connected
Point is chosen the easiest with the aspect such as data measurement, has solving speed faster, it is not necessary to take compared with other traditional methods
Build accurate model parameter needed for the phantom of complexity and phantom, and method need not be difficult to calculated system
Harmonic impedance angle, side, it is judged that in condition, all parameters all only directly or indirectly need to obtain according to measurement data, has stronger work
Journey practicality.
The method according to the invention, is analyzed the measured data of a certain arc furnace load, the harmonic voltage width at PCC
Value is 316V, and harmonic current is 68A, harmonic voltage electric current angleIt is 112 °, utilizes system side harmonic impedance estimation side
Method, obtains system side harmonic impedance amplitude | Zu| it is 10 Ω.Arc furnace load is typical inductive load, to high pressure at PCC
Looking in side, its system side is also perception.Parameter is substituted into formula:This inequality is set up.May determine that
At PCC, harmonic wave is essentially from user side.
Institute of the present invention extracting method Practical Project is easy and simple to handle, has solving speed faster compared with other traditional methods,
Need not utilize measured data to calculate in a large number, only can need to accurately judge that user side is major harmonic according to measurement data
Source, has stronger engineering practicability.
Claims (1)
1. one kind judges, based on what impedance retrained, the harmonic wave source tracing method that user side is main harmonic source, it is characterised in that include as follows
Step:
Step one, with quality of power supply oscillograph to occurring that at the points of common connection PCC of harmonic pollution, voltage and current waveform is carried out
Gather, and utilize fast Fourier transform to obtain content or the size of each harmonic, find out the overtone order that content is higher；
Step 2, promise is utilized to pause the equivalent circuit analysis model as system side and user-side harmonic source, according to kirchhoff electricity
Stream law obtains:WithWhereinIt is respectively system side and user side equivalent harmonic wave current source,
Zu、ZcIt is respectively system side and the equivalent harmonic wave impedance of user side,It is respectively the h subharmonic voltage recorded at PCC harmonious
Ripple electric current；With harmonic voltage for reference phasor,Then harmonic currentV is voltage unit
Volt, A is current unit peace,For harmonic voltage and the angle of electric current,Amplitude be Upcc Amplitude be Ipcc,Amplitude
For Iu,Amplitude be Ic, ZuAmplitude be | Zu|, ZcAmplitude be | Zc|；
Step 3, according to voltage vector principle of stacking, harmonic voltage at PCC is decomposed, obtains both sides to harmonic voltage at PCC
Distortion contribution degree size；User side be the sufficient and necessary condition in major harmonic source be Ic>Iu, it is equivalent to Ic 2-Iu 2> 0, with harmonic wave electricity
Current voltage angleAnd system side harmonic impedance angle αuWith user-side harmonic impedance angle αcFor independent variable, and according toWithExpression
Formula, by squared for its mould length, formula is deformed into:With
Step 4, according to I in step 3u 2And Ic 2Expression formula can obtain Ic 2-Iu 2Expression formula
By being more than zero on the right of judgment expression, can make
For judging the condition that user side is major harmonic source, if having
Then can determine whether that user side is major harmonic source；
It is used for judging the harmonic wave active power direction method of major harmonic source position in step 5, engineering, it is judged that user side is main
During harmonic source, at PCC, harmonic voltage electric current angle is in second and third quadrant (90 °, 270 °) scope；
Situation 1, system side and the impedance of user side are all perception: when measuring the angle obtainedWhen the second quadrant, have
In formula: the ratio k of both sides impedance magnitude=| Zc|/|Zu|；Because user-side harmonic modulus of impedance length hinders more than system side harmonic wave
Anti-mould length (| Zc|>|Zu|), so simplifyingBecause both sides impedance is all perception, αuAnd αcBelong to (0 °,
90 °) scope, the cosine term perseverance on the right of Rule of judgment formula after simplification is negative, and on the right of inequality, perseverance is just；
For eliminating the impact of impedance angle, by harmonic voltage electric current angle at PCCBe divided into the second quadrant (90 °, 135 °) and (135 °,
270 °) two regions discuss；
1. angleIt is positioned at the second quadrant (90 °, 135 °) region, as system side impedance angle αuDuring for (0 °, 90 °) scope arbitrary value,Minima beCan obtain,2. angleBe positioned at the second quadrant (135 °,
180 °) region, as system side impedance angle αuDuring for (0 °, 90 °) scope arbitrary value,Minima beCan obtain,
WithWithAs Rule of judgment: work as angleIt is positioned at the second quadrant (90 °, 135 °) district
Territory, if measurement data meets inequality at PCCCondition, or work as angleBe positioned at the second quadrant (135 °,
180 °) region, if measurement data meets inequality at PCCCondition time, it can be determined that user side is the most humorous
Wave source；
Situation 2, when system side harmonic impedance and user-side harmonic impedance are capacitive:
WhenAt third quadrant and system side harmonic impedance ZuWith user-side harmonic impedance ZcDuring for capacitive, derivation and above-mentioned class
Seemingly, all interval border values and ZuAnd ZcIt is all perception and there is at 180 ° mirror symmetry, and Rule of judgment is constant；That is: folder is worked as
AngleIt is positioned at third quadrant (225 °, 270 °) region, if measurement data meets inequality at PCCCondition, or
Work as angleIt is positioned at third quadrant (180 °, 225 °) region, if measurement data meets inequality at PCCBar
During part, it is judged that user side is major harmonic source；
Step 6, to judging that analysis that user side is major harmonic source understands, at PCC, harmonic wave active power direction is by user side
During pointing system side, it is impossible to directly judge that user side is major harmonic source, also need to survey according to impedance property and harmonic voltage electric current
Amount various boundary conditions corresponding to angle determines whether, method is concluded (| Zc|>|Zu|), see table:
Judge that user side is major harmonic source
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Cited By (5)
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| CN108279363A (en) * | 2018-01-26 | 2018-07-13 | 四川大学 | Method and device is determined based on the main harmonic source for improving active power direction method |
| CN109061300A (en) * | 2018-09-19 | 2018-12-21 | 江苏中凌高科技股份有限公司 | A kind of characteristic harmonics source localization method of PCC point |
| CN109412178A (en) * | 2018-10-19 | 2019-03-01 | 湖南大学 | A kind of switching control method of high-voltage large-capacity impedance measurement equipment |
| CN109839538A (en) * | 2019-03-29 | 2019-06-04 | 云南电网有限责任公司电力科学研究院 | A kind of harmonic source identification method and system based on correlation analysis |
| CN113484690A (en) * | 2021-07-27 | 2021-10-08 | 杭州得诚电力科技股份有限公司 | Harmonic source positioning method, device, equipment and storage medium of power supply system |
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| CN109412178B (en) * | 2018-10-19 | 2021-04-30 | 湖南大学 | Switching control method of high-voltage high-capacity impedance measurement equipment |
| CN109839538A (en) * | 2019-03-29 | 2019-06-04 | 云南电网有限责任公司电力科学研究院 | A kind of harmonic source identification method and system based on correlation analysis |
| CN113484690A (en) * | 2021-07-27 | 2021-10-08 | 杭州得诚电力科技股份有限公司 | Harmonic source positioning method, device, equipment and storage medium of power supply system |
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