CN106771584A - A kind of harmonic detecting method for being applied to power distribution network - Google Patents
A kind of harmonic detecting method for being applied to power distribution network Download PDFInfo
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- CN106771584A CN106771584A CN201611027407.9A CN201611027407A CN106771584A CN 106771584 A CN106771584 A CN 106771584A CN 201611027407 A CN201611027407 A CN 201611027407A CN 106771584 A CN106771584 A CN 106771584A
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- voltage
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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
Abstract
The present invention relates to a kind of harmonic detecting method for being applied to power distribution network, comprise the following steps：（1）Obtain the harmonic data of all typical harmonic sources in grid monitoring system；（2）Show that each harmonic source accesses the position of power system；（3）The voltage and current of harmonic source is obtained, and the voltage and current of each harmonic source is analyzed；（4）Harmonic frequency is calculated using below equation, the harmonic frequency according to harmonic source draws harmonic curve,（5）According to harmonic frequency, harmonic source voltage class is judged.Method computational methods simple and fast of the present invention, harmonic detecting high precision, by calculating harmonic frequency analysis harmonic voltage grade, it is not necessary to synchronized angle, can be used in single-phase, three-phase three-wire system or three-phase four-wire system detect harmonic component.
Description
Technical field
The present invention relates to technical field of power systems, and in particular to a kind of harmonic detecting method for being applied to power distribution network.
Background technology
Nonlinear-load is in addition to producing the integer harmonic of fundamental frequency in power system, it is also possible to produce the non-whole of fundamental frequency
Subharmonic, i.e. m-Acetyl chlorophosphonazo.According to IEC-61000-2-1, m-Acetyl chlorophosphonazo (Interharmonic) is defined as：In voltage and current letter
Number harmonic component between there is the signal of frequency and fundamental frequency an odd lot times relation, it shows as discrete spectrum or width
Band frequency spectrum.Harmonic pollution is in particular in the various influences that power network brings：The efficiency of power supply-distribution system is reduced, increases electricity at different levels
The loss of net；Added losses are brought to various electrical equipments, shortens the life-span；Influence the measuring accuracy of various meters.In addition, harmonic wave
It is also possible to make protective relaying device malfunction and misaction at different levels, is had serious consequences to power network.
Be improve the quality of power supply, it is necessary to accurately detect first it is various in the case of harmonic component, be possible to compensate this
A little harmonic components.Therefore, how harmonic component in power network is quickly and easily detected, is always important studying a question.But
It is because mains by harmonics is influenceed by randomness, distributivity and the factor such as non-stationary, it is difficult to accurate survey is synchronized to it
Amount.
For the problem that accuracy of detection in power grid harmonic wave detection method of the prior art is poor, not yet propose at present effective
Solution.
The content of the invention
It is an object of the invention to provide a kind of harmonic detecting method for being applied to power distribution network, to solve Harmonic Detection
The poor problem of accuracy of detection in method.
To achieve the above object, present invention employs following technical scheme：
A kind of harmonic detecting method for being applied to power distribution network, comprises the following steps：
(1) harmonic data of all typical harmonic sources in grid monitoring system is obtained；
(2) show that each harmonic source accesses the position of power system；
(3) voltage and current of harmonic source is obtained, and the voltage and current of each harmonic source is analyzed；
(4) harmonic frequency is calculated using below equation, the harmonic frequency according to harmonic source draws harmonic curve：
Wherein, xsK () is harmonic frequency, A is amplitude, f0It is fundamental frequency, fsIt is sample frequency, θ is phase angle；
(5) according to harmonic frequency, harmonic source voltage class is judged.
Step (5), it is described according to harmonic frequency, judge harmonic source voltage class, specifically include following steps：
(1) if harmonic frequency is more than the 60% of standard regulation maximum, the harmonic voltage grade of the harmonic source is excellent；
(2) if harmonic frequency is between the 60% and 80% of standard regulation maximum, the harmonic voltage of the harmonic source
Grade is good；
(3) if harmonic frequency is located between the 80% and 100% of standard regulation maximum, the harmonic voltage of the harmonic source
Grade is qualified；
(4) if harmonic frequency is more than the 100% of standard regulation maximum, the harmonic voltage grade of the harmonic source is exceeded.
As shown from the above technical solution, the harmonic detecting method of power distribution network of the present invention, the method is simple, by meter
Calculate harmonic frequency analysis harmonic voltage grade, it is not necessary to synchronized angle, can be used for single-phase, three-phase three-wire system or three-phase and four-line
Harmonic component is detected in system processed.Computational methods simple and fast, harmonic detecting high precision.Can apply to various Harmonic Measurers
The different occasions such as device, harmonic detecting software program, Active Power Filter-APF.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of harmonic detecting method for being applied to power distribution network, comprises the following steps：
S1：Obtain the harmonic data of all typical harmonic sources in grid monitoring system；
S2：Show that each harmonic source accesses the position of power system；
S3：The voltage and current of harmonic source is obtained, and the voltage and current of each harmonic source is analyzed；
S4：Harmonic frequency is calculated using below equation, the harmonic frequency according to harmonic source draws harmonic curve：
Wherein, xsK () is harmonic frequency, A is amplitude, f0It is fundamental frequency, fsIt is sample frequency, θ is phase angle；
S5：According to harmonic frequency, harmonic source voltage class is judged, the step specifically includes following steps：
S51：If more than the 60% of standard regulation maximum, the harmonic voltage grade of the harmonic source is excellent to harmonic frequency；
S52：If harmonic frequency is between the 60% and 80% of standard regulation maximum, the harmonic voltage of the harmonic source
Grade is good；
S53：If harmonic frequency is located between the 80% and 100% of standard regulation maximum, the harmonic wave electricity of the harmonic source
Pressure grade is qualified；
S54：If harmonic frequency is more than the 100% of standard regulation maximum, the harmonic voltage grade of the harmonic source is exceeded.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall into the protection domain of claims of the present invention determination.
Claims (2)
1. a kind of harmonic detecting method for being applied to power distribution network, it is characterised in that：Comprise the following steps：
(1) harmonic data of all typical harmonic sources in grid monitoring system is obtained；
(2) show that each harmonic source accesses the position of power system；
(3) voltage and current of harmonic source is obtained, and the voltage and current of each harmonic source is analyzed；
(4) harmonic frequency is calculated using below equation, the harmonic frequency according to harmonic source draws harmonic curve：
Wherein, xsK () is harmonic frequency, A is amplitude, f0It is fundamental frequency, fsIt is sample frequency, θ is phase angle；
(5) according to harmonic frequency, harmonic source voltage class is judged.
2. the harmonic detecting method for being applied to power distribution network according to claim 1, it is characterised in that：Step (5), described
According to harmonic frequency, harmonic source voltage class is judged, specifically include following steps：
(1) if harmonic frequency is more than the 60% of standard regulation maximum, the harmonic voltage grade of the harmonic source is excellent；
(2) if harmonic frequency is between the 60% and 80% of standard regulation maximum, the harmonic voltage grade of the harmonic source
For good；
(3) if harmonic frequency is located between the 80% and 100% of standard regulation maximum, the harmonic voltage grade of the harmonic source
For qualified；
(4) if harmonic frequency is more than the 100% of standard regulation maximum, the harmonic voltage grade of the harmonic source is exceeded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611027407.9A CN106771584A (en) | 2016-11-16 | 2016-11-16 | A kind of harmonic detecting method for being applied to power distribution network |
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| CN201611027407.9A CN106771584A (en) | 2016-11-16 | 2016-11-16 | A kind of harmonic detecting method for being applied to power distribution network |
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| CN106771584A true CN106771584A (en) | 2017-05-31 |
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| CN201611027407.9A Pending CN106771584A (en) | 2016-11-16 | 2016-11-16 | A kind of harmonic detecting method for being applied to power distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007145A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A kind of resonance point detecting method based on constant pressure source converter and voltage current phase difference |
| CN110007141A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A kind of resonance point detecting method based on voltage and current harmonic wave similarity |
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| CN103235180A (en) * | 2013-04-08 | 2013-08-07 | 国家电网公司 | Inter-harmonics measuring method for power grid |
| CN203287435U (en) * | 2013-05-16 | 2013-11-13 | 南京工程学院 | A micro electrical network harmonic wave and inter-harmonic wave test apparatus based on an STM32F107VCT6 |
| CN105429304A (en) * | 2015-12-31 | 2016-03-23 | 国家电网公司 | Power grid harmonic wave monitoring method |
| CN105425038A (en) * | 2015-11-23 | 2016-03-23 | 广东工业大学 | Measurement method for inter-harmonics of electric power system |
| WO2016078501A1 (en) * | 2014-11-17 | 2016-05-26 | 中车青岛四方机车车辆股份有限公司 | System and method for testing network-side harmonic component of motor train unit |
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2016
- 2016-11-16 CN CN201611027407.9A patent/CN106771584A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235180A (en) * | 2013-04-08 | 2013-08-07 | 国家电网公司 | Inter-harmonics measuring method for power grid |
| CN203287435U (en) * | 2013-05-16 | 2013-11-13 | 南京工程学院 | A micro electrical network harmonic wave and inter-harmonic wave test apparatus based on an STM32F107VCT6 |
| WO2016078501A1 (en) * | 2014-11-17 | 2016-05-26 | 中车青岛四方机车车辆股份有限公司 | System and method for testing network-side harmonic component of motor train unit |
| CN105425038A (en) * | 2015-11-23 | 2016-03-23 | 广东工业大学 | Measurement method for inter-harmonics of electric power system |
| CN105429304A (en) * | 2015-12-31 | 2016-03-23 | 国家电网公司 | Power grid harmonic wave monitoring method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007145A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A kind of resonance point detecting method based on constant pressure source converter and voltage current phase difference |
| CN110007141A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A kind of resonance point detecting method based on voltage and current harmonic wave similarity |
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