CN108196127A - Harmonic impedance scanning method and device for high-voltage direct-current transmission system - Google Patents
Harmonic impedance scanning method and device for high-voltage direct-current transmission system Download PDFInfo
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Abstract
The application provides a harmonic impedance scanning method for a high-voltage direct-current power transmission system, which comprises the following steps: injecting a harmonic current having a starting frequency and a starting amplitude into the system; after the system enters a steady state, extracting response values of harmonic voltage and harmonic current of a measuring point; gradually increasing the amplitude of the harmonic current for measurement until the amplitude of the harmonic current reaches an upper amplitude limit, and calculating a harmonic impedance value under the initial frequency according to a measurement result after the amplitude is adjusted up each time; and gradually changing the frequency of the harmonic current to a cut-off frequency according to a preset frequency step, and continuously measuring the harmonic impedance values under other frequencies according to the steps. The interference of the disturbance amplitude in the system on the measurement result is eliminated, and the harmonic impedance of the high-voltage direct-current transmission system is accurately measured.
Description
Technical field
This application involves technical field of HVDC transmission more particularly to a kind of HVDC transmission system harmonic impedance to sweep
Retouch method and apparatus.
Background technology
HVDC transmission system is a kind of strong non-due to containing a large amount of electronic power switch and complicated controlling unit
Linear system.In electric system, various background harmonics act on the harmonic wave of HVDC transmission system initiation with system disturbance
Problem is by the normal operation for the system that influences or even system is caused to stablize destroyed serious consequence.Determine D.C. high voltage transmission system
The harmonic impedance of system is the key that research high-voltage direct current harmonic problem.
Power system computation machine Computer Aided Design (PSCAD) is that the widely used electromagnetic transient simulation of current electric system is soft
Part, PSCAD carry harmonic impedance solution interface and can assume that all power electronic devices are in solving circuit harmonic impedance
Off state, therefore HVDC transmission system harmonic impedance can not be scanned.
The common methods that harmonic impedance measures at present are that interference is injected into system, the responsive computing system of measuring system
Harmonic impedance information.HVDC transmission system harmonic impedance scans, and straight-flow system is needed to operate in relevant work point, exchanged
Particular harmonic current source is added at busbar or dc bus, since the harmonic current of injection transverter is not known, Injection Current width
The too small result of calculation of degree can be interfered by system background to be influenced with calculating error, and Injection Current amplitude is too big to make straight-flow system again
Operating point changes.
Invention content
In view of this, the embodiment of the present application provides a kind of HVDC transmission system harmonic impedance scan method and dress
It puts, the technical issues of disturbance amplitude to solve HVDC transmission system in the prior art brings interference to measurement result.
According to the one side of the embodiment of the present application, a kind of HVDC transmission system harmonic impedance scanning side is provided
Method, the method includes：In harmonic current of the system injection with initial frequency and starting amplitude；After system enters stable state,
Extract the harmonic voltage of measurement point and the response of harmonic current；The amplitude for being stepped up harmonic current measures, Zhi Daoxie
The amplitude of wave electric current reaches the amplitude upper limit, and the harmonic impedance under initial frequency is calculated according to the measurement result after each up-regulation amplitude
Value；The frequency of harmonic current is altered in steps until cutoff frequency, and continue according to above-mentioned steps point according to preset frequency step
The harmonic impedance value under other frequencies is not measured.
According to the another aspect of the embodiment of the present application, a kind of controller is provided, including：Processor；It is handled for storage
The memory of device executable instruction；Wherein, processor is configured as：Perform above-mentioned HVDC transmission system harmonic impedance scanning
Method.
The advantageous effect of the embodiment of the present application includes：It is gradually carried out according to preset amplitude increment under each scan frequency
It measures and the harmonic impedance under the scan frequency is obtained according to preset algorithm, disturbance amplitude brings measurement result in removal system
Interference, so as to accurately measure HVDC transmission system harmonic impedance.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present application, the above-mentioned and other purpose of the application, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the flow diagram of HVDC transmission system harmonic impedance scan method provided by the embodiments of the present application；
Fig. 2 is the amplitude versus frequency characte schematic diagram that the embodiment of the present application carries out HVDC transmission system harmonic impedance scanning；
Fig. 3 is the phase-frequency characteristic schematic diagram that the embodiment of the present application carries out HVDC transmission system harmonic impedance scanning.
Specific embodiment
The application is described below based on embodiment, but the application is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in the datail description of the application.Do not have for a person skilled in the art
The description of these detail sections can also understand the application completely.In order to avoid obscuring the essence of the application, well known method, mistake
There is no narrations in detail for journey, flow, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise throughout the specification and claims " comprising ", "comprising" etc. are similar
Word should be construed to the meaning included rather than exclusive or exhaustive meaning；That is, it is containing for " including but not limited to "
Justice.
In the description of the present application, it is to be understood that term " first ", " second " etc. are only used for description purpose, without
It is understood that indicate or implying relative importance.In addition, in the description of the present application, unless otherwise indicated, the meaning of " multiple "
It is two or more.
The embodiment of the present application realize on the time-domain-simulation software PSCAD to HVDC transmission system harmonic impedance from
Dynamic scanning and calculate, emulation mode is suitable for DC side and the harmonic impedance of exchange side measures, under each scan frequency according to
Preset amplitude increment gradually measures and obtains the harmonic impedance under the scan frequency according to preset algorithm, in removal system
The interference that disturbance amplitude brings measurement result, so as to accurately measure the harmonic impedance of HVDC transmission system.
The embodiment of the present application provides a kind of flow diagram of HVDC transmission system harmonic impedance scan method, such as
Shown in Fig. 1, this method includes the following steps.
S10, in harmonic current of the system injection with initial frequency and starting amplitude.
Measurement is scanned in HVDC transmission system harmonic electric current, the initial frequency of harmonic current and each
Starting amplitude under scan frequency is pre-arranged before scanning starts as sweep parameter.
S11 after system enters stable state, extracts the harmonic voltage of measurement point and the response of harmonic current.
After HVDC transmission system enters stable state under initial frequency and starting amplitude, the initial frequency and starting are measured
Harmonic voltage U under amplitude1(f) with harmonic current I1(f)。
S12, the amplitude for being stepped up harmonic current measure, until the amplitude of harmonic current reaches the amplitude upper limit, root
The harmonic impedance value under the initial frequency is calculated according to the measurement result after each up-regulation amplitude.
Amplitude increment and the final amplitude upper limit for increasing amplitude every time are advance as sweep parameter before scanning starts
Setting, so as to obtain the measurement knot of multigroup harmonic voltage and harmonic current between the starting amplitude of original frequency and the amplitude upper limit
Fruit, i.e. [U1(f), U2(f),…,UiAnd [I (f)]1(f), I2(f),…,Ii(f)]。
According to the formula of harmonic impedanceAnd preset optimization algorithm calculates the harmonic wave under initial frequency
Impedance value Z (f).
The larger data of error are rejected first from this group of measurement result, can be picked at this time according to gross error criterion
Except the data that error is larger.For example, measurement error is more than by 3 times of standard error (or its estimated value) up to criterion using Rye
Measured value is given up as bad value is measured；Or Grubbs (Grubbs) criterion is used, Grubbs test method is with sample
This measurement data based on t is distributed, has specific probability meaning, when the corresponding residual error of measured value meets Grubbs standard
During conditional expression then, then the measured value will be rejected.
After rejecting error information, remaining measurement data and optimization algorithm is recycled to obtain the harmonic wave resistance under original frequency
Anti- Z (f).Least squares estimate can be used and fit each group of measurement result Ui(f) and Ii(f) it is linear under original frequency
Relationship, so as to obtain corresponding harmonic impedance.
According to preset frequency step the frequency of harmonic current is altered in steps until cutoff frequency, and continue according to upper in S13
It states step and measures harmonic impedance value under other frequencies respectively.
Frequency step and cutoff frequency are pre-arranged before scanning starts as sweep parameter.Since initial frequency,
Increase according to frequency compensation or reduce scan frequency, according to after adjustment frequency continue from starting amplitude proceed by measurement until
The amplitude upper limit, and calculate the harmonic impedance under the scan frequency according to all measurement results.Institute is calculated as procedure described above
There is the harmonic impedance under scan frequency.
HVDC transmission system harmonic impedance scan method provided by the embodiments of the present application is according to default amplitude increment pair
Each scan frequency carries out the measurement of harmonic impedance, eliminates and the interference that amplitude brings measurement result is disturbed in system, so as to
The accurate harmonic impedance for measuring HVDC transmission system.It is being measured to HVDC transmission system according to the above method
Before, the module for being able to carry out above-mentioned HVDC transmission system harmonic impedance scan method is loaded on electro-magnetic transient software, so
Afterwards, scan mode and sweep parameter are inputted in the module.Scan mode includes DC side scanning and exchange side scanning, sweep parameter
Including initial frequency, cutoff frequency, frequency step, harmonic current increment and the harmonic current upper limit.
If the scan mode of input is scanned for DC side, the harmonic current injected is
If the scan mode of input is scanned for exchange side, the harmonic current injected is：
Wherein, f is the frequency values for scanning harmonic wave,For the initial phase of harmonic, Δ IkAmplitude for harmonic increases
Amount, n are the number of harmonic.
When exchange side scans, when three-phase phase is respectivelyWhen, injection positive sequence harmonic electricity
Stream.
When three-phase phase is respectivelyWhen, inject negative sequence harmonic current.
According to the embodiment of the present application to HVDC transmission system carry out harmonic impedance scanning amplitude versus frequency characte schematic diagram and
Phase-frequency characteristic schematic diagram difference is as shown in Figures 2 and 3.
In addition, HVDC transmission system harmonic impedance scanning means provided by the embodiments of the present application includes：Processor is used
In the memory of storage processor-executable instruction；Wherein, processor is configured as：There is initial frequency in system injection and rise
The harmonic current of beginning amplitude；After system enters stable state, the harmonic voltage of measurement point and the response of harmonic current are extracted；Gradually
The amplitude for increasing harmonic current measures, until the amplitude of harmonic current reaches the amplitude upper limit, after each up-regulation amplitude
Measurement result calculate initial frequency under harmonic impedance value；The frequency of harmonic current is altered in steps according to preset frequency step
Until cutoff frequency, and continue to measure the harmonic impedance value under other frequencies respectively according to above-mentioned steps.
In one embodiment, in system injection with initial frequency and before originating the harmonic current of amplitude, processor
It is configured to：Input preset scan mode and sweep parameter；Scan mode includes DC side scanning and exchange side is swept
It retouches, sweep parameter includes initial frequency, cutoff frequency, frequency step, harmonic current increment and the harmonic current upper limit.
In one embodiment, when scan mode is scanned for DC side, the harmonic current of injection is
When scan mode is scanned for exchange side, the harmonic current of injection is
Wherein, f is the frequency values for scanning harmonic wave,For the initial phase of harmonic, Δ IkAmplitude for harmonic increases
Amount, n are the number of harmonic.
In one embodiment, the amplitude for being stepped up harmonic current measures, until the amplitude of harmonic current reaches
The amplitude upper limit calculates the harmonic impedance value under the initial frequency according to the measurement result after each up-regulation amplitude and includes：
Fourier decomposition is carried out to the Injection Current and voltage responsive value of transverter, obtains the harmonic current under original frequency
Ii(f) and harmonic voltage Ui(f)；
The amplitude of harmonic current is stepped up, obtains multigroup harmonic voltage [U1(f), U2(f),…,Ui(f)] it is and multigroup humorous
Wave electric current [I1(f), I2(f),…,Ii(f)] measurement data, according to the calculation formula of harmonic impedanceIt obtains
The corresponding harmonic impedance Z of every group of measurement datai(f)；
Error information is rejected from obtained harmonic impedance data, and is obtained under original frequency using preset optimization algorithm
Harmonic impedance Z (f).
In one embodiment, error information is rejected from obtained harmonic impedance data, and is calculated using preset optimization
The harmonic impedance Z (f) that method is obtained under original frequency further comprises：
Error information is rejected from obtained harmonic impedance data according to gross error criterion；
Least squares estimate is recycled to obtain the harmonic impedance Z (f) under original frequency.
The foregoing is merely the preferred embodiments of the application, are not limited to the application, for those skilled in the art
For, the application can have various modifications and changes.All any modifications made within spirit herein and principle are equal
Replace, improve etc., it should be included within the protection domain of the application.
Claims (10)
1. a kind of HVDC transmission system harmonic impedance scan method, which is characterized in that the method includes：
In harmonic current of the system injection with initial frequency and starting amplitude；
After system enters stable state, the harmonic voltage of measurement point and the response of harmonic current are extracted；
The amplitude for being stepped up harmonic current measures, until the amplitude of harmonic current reaches the amplitude upper limit, on every time
Measurement result after amplitude modulation value calculates the harmonic impedance value under the initial frequency；
The frequency of harmonic current is altered in steps until cutoff frequency, and continue according to above-mentioned steps point according to preset frequency step
The harmonic impedance value under other frequencies is not measured.
2. according to the method described in claim 1, it is characterized in that, with initial frequency and originate the humorous of amplitude in system injection
Before wave electric current, the method further includes：
Input preset scan mode and sweep parameter；The scan mode includes DC side scanning and exchange side scanning, described
Sweep parameter includes initial frequency, cutoff frequency, frequency step, harmonic current increment and the harmonic current upper limit.
3. according to the method described in claim 2, it is characterized in that, when the scan mode for DC side scan when, injection
Harmonic current is
When the scan mode is scanned for exchange side, the harmonic current of injection is
Wherein, f is the frequency values for scanning harmonic wave,For the initial phase of harmonic, Δ IkFor the amplitude increment of harmonic, n is
The number of harmonic.
4. according to the method described in claim 1, it is characterized in that, the amplitude for being stepped up harmonic current measures, until
The amplitude of harmonic current reaches the amplitude upper limit, is calculated according to the measurement result after each up-regulation amplitude humorous under the initial frequency
Wave impedance value includes：
Fourier decomposition is carried out to the Injection Current and voltage responsive value of transverter, obtains the harmonic current I under original frequencyi(f)
With harmonic voltage Ui(f)；
The amplitude of harmonic current is stepped up, obtains multigroup harmonic voltage [U1(f), U2(f),…,Ui(f)] and multigroup harmonic wave is electric
Flow [I1(f), I2(f),…,Ii(f)] measurement data, according to the calculation formula of harmonic impedanceObtain every group
The corresponding harmonic impedance Z of measurement datai(f)；
Error information is rejected from obtained harmonic impedance data, and is obtained using preset optimization algorithm humorous under original frequency
Wave impedance Z (f).
5. according to the method described in claim 4, it is characterized in that, reject error information from obtained harmonic impedance data,
And it obtains the harmonic impedance Z (f) under original frequency using preset optimization algorithm and includes：
Error information is rejected from obtained harmonic impedance data according to gross error criterion；
Least squares estimate is recycled to obtain the harmonic impedance Z (f) under original frequency.
6. a kind of HVDC transmission system harmonic impedance scanning means, which is characterized in that including：
Processor；
For storing the memory of processor-executable instruction；
Wherein, the processor is configured as：
In harmonic current of the system injection with initial frequency and starting amplitude；
After system enters stable state, the harmonic voltage of measurement point and the response of harmonic current are extracted；
The amplitude for being stepped up harmonic current measures, until the amplitude of harmonic current reaches the amplitude upper limit, on every time
Measurement result after amplitude modulation value calculates the harmonic impedance value under the initial frequency；
The frequency of harmonic current is altered in steps until cutoff frequency, and continue according to above-mentioned steps point according to preset frequency step
The harmonic impedance value under other frequencies is not measured.
7. device according to claim 6, which is characterized in that with initial frequency and originate the humorous of amplitude in system injection
Before wave electric current, the processor is configured to：
Input preset scan mode and sweep parameter；The scan mode includes DC side scanning and exchange side scanning, described
Sweep parameter includes initial frequency, cutoff frequency, frequency step, harmonic current increment and the harmonic current upper limit.
8. device according to claim 7, which is characterized in that when the scan mode is scanned for DC side, injection
Harmonic current is
When the scan mode is scanned for exchange side, the harmonic current of injection is
Wherein, f is the frequency values for scanning harmonic wave,For the initial phase of harmonic, Δ IkFor the amplitude increment of harmonic, n is
The number of harmonic.
9. device according to claim 6, which is characterized in that the amplitude for being stepped up harmonic current measures, until
The amplitude of harmonic current reaches the amplitude upper limit, is calculated according to the measurement result after each up-regulation amplitude humorous under the initial frequency
Wave impedance value includes：
Fourier decomposition is carried out to the Injection Current and voltage responsive value of transverter, obtains the harmonic current I under original frequencyi(f)
With harmonic voltage Ui(f)；
The amplitude of harmonic current is stepped up, obtains multigroup harmonic voltage [U1(f), U2(f),…,Ui(f)] and multigroup harmonic wave is electric
Flow [I1(f), I2(f),…,Ii(f)] measurement data, according to the calculation formula of harmonic impedanceObtain every group of survey
Measure the corresponding harmonic impedance Z of datai(f)；
Error information is rejected from obtained harmonic impedance data, and is obtained using preset optimization algorithm humorous under original frequency
Wave impedance Z (f).
10. device according to claim 9, which is characterized in that error information is rejected from obtained harmonic impedance data,
And it obtains the harmonic impedance Z (f) under original frequency using preset optimization algorithm and includes：
Error information is rejected from obtained harmonic impedance data according to gross error criterion；
Least squares estimate is recycled to obtain the harmonic impedance Z (f) under original frequency.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030950A (en) * | 2018-08-06 | 2018-12-18 | 南方电网科学研究院有限责任公司 | Impedance scanning method and system for power electronic equipment |
| CN109038534A (en) * | 2018-07-17 | 2018-12-18 | 中国南方电网有限责任公司 | Novel harmonic impedance scanning device of direct current transmission system |
| CN110058084A (en) * | 2019-04-15 | 2019-07-26 | 南方电网科学研究院有限责任公司 | Harmonic impedance measurement system and method of converter transformer |
| CN110456161A (en) * | 2019-08-09 | 2019-11-15 | 合肥工业大学 | The impedance measurement method of forcing frequency and disturbance amplitude self adaptive control |
| CN110988485A (en) * | 2019-12-24 | 2020-04-10 | 上海科梁信息工程股份有限公司 | Impedance detection system and impedance detection method for direct-current micro-grid |
| CN111337751A (en) * | 2020-03-31 | 2020-06-26 | 国网安徽省电力有限公司电力科学研究院 | Converter station alternating current side impedance online test method |
| CN111505439A (en) * | 2020-04-21 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | Impedance frequency sweeping device for direct current system, control method thereof and storage medium |
| CN115219791A (en) * | 2022-06-16 | 2022-10-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Harmonic impedance scanning method |
| WO2023155528A1 (en) * | 2022-02-15 | 2023-08-24 | 许继电气股份有限公司 | Method for performing impedance amplitude-frequency characteristic scanning for rtds model based on positive and negative zero domains |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180458A1 (en) * | 2001-03-29 | 2002-12-05 | Ho Eddy Ying Yin | Method and system for automatic determination of inductance |
| US20130141117A1 (en) * | 2011-12-02 | 2013-06-06 | Neovision Llc | Impedance resonance sensor for real time monitoring of different processes and methods of using same |
| CN103544378A (en) * | 2013-09-28 | 2014-01-29 | 南方电网科学研究院有限责任公司 | Method for calculating harmonic impedance of alternating current system for direct current transmission |
| CN103605002A (en) * | 2013-11-13 | 2014-02-26 | 云南电网公司电网规划研究中心 | Harmonic impedance measurement apparatus of electric power system |
| CN105510719A (en) * | 2015-11-30 | 2016-04-20 | 云南电网有限责任公司玉溪供电局 | Three-phase power grid harmonic impedance measurement method |
| CN105699779A (en) * | 2015-12-31 | 2016-06-22 | 北京交通大学 | Cascaded H-bridge type traction network impedance test harmonic generator and test method |
| CN107247185A (en) * | 2017-06-05 | 2017-10-13 | 西南交通大学 | Tractive power supply system harmonic impedance measurement device and its test method |
| CN107576851A (en) * | 2017-07-26 | 2018-01-12 | 华南理工大学 | System harmonic impedance measuring method based on rotatory current phasor |
-
2018
- 2018-01-22 CN CN201810058456.1A patent/CN108196127B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180458A1 (en) * | 2001-03-29 | 2002-12-05 | Ho Eddy Ying Yin | Method and system for automatic determination of inductance |
| US20130141117A1 (en) * | 2011-12-02 | 2013-06-06 | Neovision Llc | Impedance resonance sensor for real time monitoring of different processes and methods of using same |
| CN103544378A (en) * | 2013-09-28 | 2014-01-29 | 南方电网科学研究院有限责任公司 | Method for calculating harmonic impedance of alternating current system for direct current transmission |
| CN103605002A (en) * | 2013-11-13 | 2014-02-26 | 云南电网公司电网规划研究中心 | Harmonic impedance measurement apparatus of electric power system |
| CN105510719A (en) * | 2015-11-30 | 2016-04-20 | 云南电网有限责任公司玉溪供电局 | Three-phase power grid harmonic impedance measurement method |
| CN105699779A (en) * | 2015-12-31 | 2016-06-22 | 北京交通大学 | Cascaded H-bridge type traction network impedance test harmonic generator and test method |
| CN107247185A (en) * | 2017-06-05 | 2017-10-13 | 西南交通大学 | Tractive power supply system harmonic impedance measurement device and its test method |
| CN107576851A (en) * | 2017-07-26 | 2018-01-12 | 华南理工大学 | System harmonic impedance measuring method based on rotatory current phasor |
Non-Patent Citations (1)
| Title |
|---|
| 崔康生等: "一种适用于MTDC输电的直流***阻抗扫描方法", 《电力建设》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038534A (en) * | 2018-07-17 | 2018-12-18 | 中国南方电网有限责任公司 | Novel harmonic impedance scanning device of direct current transmission system |
| CN109030950A (en) * | 2018-08-06 | 2018-12-18 | 南方电网科学研究院有限责任公司 | Impedance scanning method and system for power electronic equipment |
| CN110058084A (en) * | 2019-04-15 | 2019-07-26 | 南方电网科学研究院有限责任公司 | Harmonic impedance measurement system and method of converter transformer |
| CN110058084B (en) * | 2019-04-15 | 2021-06-08 | 南方电网科学研究院有限责任公司 | Harmonic impedance measurement system and method of converter transformer |
| CN110456161A (en) * | 2019-08-09 | 2019-11-15 | 合肥工业大学 | The impedance measurement method of forcing frequency and disturbance amplitude self adaptive control |
| CN110988485A (en) * | 2019-12-24 | 2020-04-10 | 上海科梁信息工程股份有限公司 | Impedance detection system and impedance detection method for direct-current micro-grid |
| CN111337751A (en) * | 2020-03-31 | 2020-06-26 | 国网安徽省电力有限公司电力科学研究院 | Converter station alternating current side impedance online test method |
| CN111337751B (en) * | 2020-03-31 | 2022-05-24 | 国网安徽省电力有限公司电力科学研究院 | Converter station alternating current side impedance online test method |
| CN111505439A (en) * | 2020-04-21 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | Impedance frequency sweeping device for direct current system, control method thereof and storage medium |
| WO2023155528A1 (en) * | 2022-02-15 | 2023-08-24 | 许继电气股份有限公司 | Method for performing impedance amplitude-frequency characteristic scanning for rtds model based on positive and negative zero domains |
| CN115219791A (en) * | 2022-06-16 | 2022-10-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Harmonic impedance scanning method |
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