CN103954859B - The harmonic current characteristic analysis method of given voltage based on Harmonic source model - Google Patents
The harmonic current characteristic analysis method of given voltage based on Harmonic source model Download PDFInfo
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Abstract
The present invention relates to a kind of harmonic current characteristic analysis method of the given voltage based on Harmonic source model, comprise the following steps：1) instantaneous voltage, the current waveform of harmonic source are surveyed；2) FFT is carried out to measurement voltage, obtains fundamental voltage waveform；3) according to ohm law, identification corresponds to the fundamental voltage, the C-V characteristic characteristic curve of measured current；4) calculated by fundamental load flow, obtain the fundamental wave sinusoidal voltage of harmonic wave source node；5) based on the VA characteristic curve recognized, the load current waveform for corresponding to given fundamental voltage is calculated；6) FFT is carried out to this current waveform samples value, obtains each component of degree n n of harmonic current under given fundamental voltage.Compared with prior art, the present invention has the advantages that to have a wide range of application, accuracy is high, it is good to model effect.
Description
Technical field
The present invention relates to a kind of harmonic current analysis method, more particularly, to a kind of given voltage based on Harmonic source model
Harmonic current characteristic analysis method.
Background technology
The model of harmonic source is set up extremely important for research harmonic phenomena.In recent years, with power electronics skill can be turned off
The extensive use of art, harmonic problem shows source characteristic more complicated than ever.Traditional harmonic source is mainly distributed on load
Side, such as thyristor controlled power source such as conventional electrical locomotive, electrolysis chemical industry, traditional direct current transportation, is handed over certainly
Stream electric arc furnaces and direct current electric arc furnace fall within typical conventional harmonic source；New is not distributed only over different from traditional harmonic source
Load side, such as new motor-car, high ferro, HVDC Light, other energy-saving electrically (frequency conversions), is also distributed in Generation Side,
Such as solar power generation, some type units (double feedback electric engine) of wind-power electricity generation, the harmonic source of these types is not passed
Unite meaning low-order harmonic or value very little, but high band such as tens subharmonic but show abundant harmonic group,
M-Acetyl chlorophosphonazo group phenomena.Therefore, how using the harmonic source varied in a kind of model method sunykatuib analysis power network of generality
It is one of key topics of harmonic problem research.
The scheme of the invention is based primarily upon following theory：First, the VA characteristic curve of harmonic-producing load is its intrinsic spy
Levy；Second, the instantaneity meeting market's demand of ohm law, that is to say, that at any time, for instantaneous value, ohm law
Always adapt to.Based on above-mentioned 2 points, coordinate the real-time electricity of quality of power supply on-line monitoring or portable electric energy quality monitoring device
Pressure, current waveform capture ability, realize the VA characteristic curve identification of all kinds of harmonic sources, being utilized based on given fundamental voltage should
VA characteristic curve realizes the Accurate Model of all kinds of harmonic sources.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on harmonic source mould
The harmonic current characteristic analysis method of the given voltage of type.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of harmonic current characteristic analysis method of the given voltage based on Harmonic source model, it is characterised in that including with
Lower step：
1) instantaneous voltage, the current waveform of harmonic source are surveyed；
2) FFT (FFT) is carried out to measurement voltage, obtains fundamental voltage waveform；
3) according to ohm law, identification corresponds to the fundamental voltage, the C-V characteristic characteristic curve of measured current；
4) calculated by fundamental load flow, obtain the fundamental wave sinusoidal voltage of harmonic wave source node；
5) based on the VA characteristic curve recognized, the load current waveform corresponding to the fundamental wave sinusoidal voltage is calculated；
6) FFT (FFT) is carried out to load current waveform sample values, obtained under the fundamental wave sinusoidal voltage
Each component of degree n n of harmonic current.
Harmonic source in described step 1 includes comprehensive harmonic source, i.e. harmonic source composition is complicated or unknown, it is impossible to directly
Mathematical description is carried out by structural analysis.
Quality of power supply on-line measuring device or portable electric energy mass-synchrometer field measurement are used in described step 1.
Fundamental wave sinusoidal voltage in described step 4 is any given fundamental voltage.
Compared with prior art, the present invention has the advantages that general, accurate, simple, easy
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is supply voltage, current sample curve map；
Fig. 3 is VA characteristic curve figure；
Fig. 4 is the current curve diagram obtained according to VA characteristic curve and given voltage；
Fig. 5 is current harmonics sequence chart.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment：
As shown in figure 1, a kind of harmonic current characteristic analysis method of the given voltage based on Harmonic source model, its feature exists
In comprising the following steps：
101st, instantaneous voltage, the current waveform of harmonic source are surveyed；
102nd, FFT (FFT) is carried out to measurement voltage, obtains fundamental voltage waveform；
103rd, according to ohm law, identification corresponds to the fundamental voltage, the C-V characteristic characteristic curve of measured current；
104th, calculated by fundamental load flow, obtain the fundamental wave sinusoidal voltage of harmonic wave source node；
105th, based on the VA characteristic curve recognized, the load current ripple corresponding to the fundamental wave sinusoidal voltage is calculated
Shape；
106th, FFT (FFT) is carried out to this current waveform samples value, obtained under the fundamental wave sinusoidal voltage
Each component of degree n n of harmonic current.
For voltage：U (t)=sin (wt)+0.03sin (3wt+ π/6)+0.02*sin (5wt), w=2 π f, f=50Hz；
Electric current：I (t)=0.8sin (wt+ pi/2s)+0.1sin (2wt)+0.3sin (3wt+ pi/2s)+0.2sin (5wt+3 π/
2)
Its harmonic source real standard is as shown in table 1.
Table 1：Harmonic source real standard data
| Number of times | 1 | 2 | 3 | 5 |
| Amplitude | 0.8 | 0.1 | 0.3 | 0.2 |
| Phase | 90 | 0 | 90 | 270 |
Utilize quality of power supply on-line measuring device or portable electric energy mass-synchrometer, field measurement to above-mentioned voltage, electricity
The actual waveform of stream；FFT is carried out to the measurement voltage, the phase and amplitude (as shown in Figure 2) of fundamental voltage is obtained, uses this
Fundamental voltage carries out VA characteristic curve identification, identification result such as Fig. 3 with measured current.
After VA characteristic curve is obtained, for given any fundamental voltage, (or fundamental load flow is calculated and obtained, or takes volume
Determine voltage, or set-point), the current waveform (Fig. 4) corresponding to the VA characteristic curve is calculated using ohm law, to the electric current
Waveform carries out fft analysis, then obtain to should be under VA characteristic curve and the fundamental voltage harmonic wave value, such as Fig. 5, the institute of table 2
Show.
Table 2：The harmonic current identification result of correspondence VA characteristic curve under specified fundamental voltage
| Number of times | 1 | 2 | 3 | 5 |
| Amplitude | 0.8 | 0.1 | 0.3 | 0.2 |
| Phase (degree) | 90 | 5.469e-14 | 90 | -90 |
This method can be applied to all kinds of non-linear harmonic wave sources occasion, by existing electric energy quality on-line monitoring device or just
The formula analyzer of taking easily tests voltage, current waveform, so as to recognize VA characteristic curve, sets up Harmonic source model, is humorous
Wave analysis provides technical support.For example：
1st, the harmonic current source model library of each node can be set up, is preserved；
2nd, the Harmonic source model of each node under different operating modes can be accumulated by season, the method for operation；
3rd, the model can be applied to all kinds of offline frequency analyses, it is only necessary to carries out conventional fundamental load flow and calculates, just can be according to
According to the result and the Harmonic source model of each node of Load flow calculation, the harmonic wave spy corresponding to each node of the tidal current analysis result is provided
Levy.
4th, using the harmonic current, simple I is solvedh=Yh·VhEquation, obtain to should trend distribution each point harmonic wave
Voltage level.
Claims (3)
1. a kind of harmonic current characteristic analysis method of the given voltage based on Harmonic source model, it is characterised in that including following
Step：
1) instantaneous voltage, the current waveform of harmonic source are surveyed；
2) FFT is carried out to measurement voltage, obtains fundamental voltage waveform；
3) according to ohm law, identification corresponds to the fundamental voltage, the C-V characteristic characteristic curve of measured current；
4) calculated by fundamental load flow, obtain the fundamental wave sinusoidal voltage of harmonic wave source node；
5) based on the VA characteristic curve recognized, the load current waveform corresponding to the fundamental wave sinusoidal voltage is calculated；
6) FFT is carried out to load current waveform sample values, obtains each component of degree n n of harmonic current under the fundamental wave sinusoidal voltage.
2. a kind of harmonic current characteristic analysis method of given voltage based on Harmonic source model according to claim 1,
Characterized in that, described step 1) in harmonic source include comprehensive harmonic source.
3. a kind of harmonic current characteristic analysis method of given voltage based on Harmonic source model according to claim 1,
Characterized in that, described step 1) it is middle real using quality of power supply on-line measuring device or portable electric energy mass-synchrometer scene
Survey.
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| CN106324344A (en) * | 2016-09-22 | 2017-01-11 | 国家电网公司 | Instantaneously measured waveform-based nonlinear load electricity consumption characteristic analysis system and method |
| CN108169585B (en) * | 2017-11-28 | 2019-08-09 | 国电南瑞科技股份有限公司 | One kind prejudging other division of responsibiltiy engineering method based on harmonic source |
| CN108964056A (en) * | 2018-09-05 | 2018-12-07 | 上海赛璞乐电力科技有限公司 | A kind of comprehensive harmonic-model construction method of electric system and its application |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5868676A (en) * | 1981-10-21 | 1983-04-23 | Hitachi Ltd | Detecting system for higher harmonic component |
| US6215316B1 (en) * | 1998-08-11 | 2001-04-10 | The Governor Of The University Of Alberta | Method and apparatus for measuring harmonic current sources in electric power distribution systems |
| JP2007139434A (en) * | 2005-11-15 | 2007-06-07 | Tokyo Electric Power Co Inc:The | Method and device for estimating high-voltage capacitor current |
| JP2008256599A (en) * | 2007-04-06 | 2008-10-23 | Tokyo Electric Power Co Inc:The | Harmonics retrieval method |
| CN101493482A (en) * | 2008-07-11 | 2009-07-29 | 深圳市盛弘电气有限公司 | Single-phase harmonic current detecting method |
| CN201548627U (en) * | 2009-12-09 | 2010-08-11 | 余杭供电局 | System detecting harmonic source of common coupling node |
| CN102253266A (en) * | 2011-04-28 | 2011-11-23 | 西华大学 | Linear filter-based harmonic current detection method in three-phase four-wire system |
| CN102818921A (en) * | 2012-07-13 | 2012-12-12 | 中冶南方工程技术有限公司 | Method for calculating amplitude and phase of alternating current signal based on iterative Fourier transform |
-
2014
- 2014-04-16 CN CN201410152814.7A patent/CN103954859B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5868676A (en) * | 1981-10-21 | 1983-04-23 | Hitachi Ltd | Detecting system for higher harmonic component |
| US6215316B1 (en) * | 1998-08-11 | 2001-04-10 | The Governor Of The University Of Alberta | Method and apparatus for measuring harmonic current sources in electric power distribution systems |
| JP2007139434A (en) * | 2005-11-15 | 2007-06-07 | Tokyo Electric Power Co Inc:The | Method and device for estimating high-voltage capacitor current |
| JP2008256599A (en) * | 2007-04-06 | 2008-10-23 | Tokyo Electric Power Co Inc:The | Harmonics retrieval method |
| CN101493482A (en) * | 2008-07-11 | 2009-07-29 | 深圳市盛弘电气有限公司 | Single-phase harmonic current detecting method |
| CN201548627U (en) * | 2009-12-09 | 2010-08-11 | 余杭供电局 | System detecting harmonic source of common coupling node |
| CN102253266A (en) * | 2011-04-28 | 2011-11-23 | 西华大学 | Linear filter-based harmonic current detection method in three-phase four-wire system |
| CN102818921A (en) * | 2012-07-13 | 2012-12-12 | 中冶南方工程技术有限公司 | Method for calculating amplitude and phase of alternating current signal based on iterative Fourier transform |
Non-Patent Citations (3)
| Title |
|---|
| 电力系统谐波分析的有效方法;周利东 等;《四川电力技术》;20100228;第33卷(第1期);第61-65页 * |
| 电网谐波溯源及治理研究;罗祾 等;《电力与能源》;20131231;第34卷(第6期);诶553-556、561页 * |
| 配电网谐波潮流计算浅析;李灿良 等;《四川建筑》;20121031;第32卷(第5期);第218-220页 * |
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