CN106645974A - Method and system for determining resonance of wind turbine and power grid - Google Patents
Method and system for determining resonance of wind turbine and power grid Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a method and a system for determining the resonance of a wind turbine and a power grid. The method for determining the resonance of the wind turbine and the power grid comprises the following steps: respectively superposing a plurality of harmonic voltages with different frequencies to fundamental wave voltages at a fan grid-connected point; obtaining a plurality of harmonic currents of a fan respectively responding to a plurality of harmonic voltages with different frequencies; determining the amplitude and phase angle of the impedance of the fan at each frequency based on the plurality of harmonic voltages and the plurality of harmonic currents; and judging whether the wind turbine and the power grid have resonance or not based on the determined amplitude and phase angle of the impedance at each frequency. According to the embodiment of the invention, if the fan is found to resonate with the power grid at a certain harmonic frequency, the resonance at the frequency is eliminated by adjusting the fan parameters, so that the safe operation of the system is ensured.
Description
Technical field
It relates to wind power generation field, more particularly, to for determining the method for blower fan and electrical network resonance and be
System.
Background technology
With becoming increasingly conspicuous for energy and environment problem, regenerative resource is invested in countries in the world more sight.Wind
Can be the important class of regenerative resource, because its reserves is big, renewable, be distributed wide, free of contamination characteristic, become the whole world general
All over the clean energy resource welcome.Wind-power electricity generation is used as current on the largest scaleization exploit condition and the renewable energy of commercialized development prospect
Source generation mode, is more and more paid attention to by countries in the world.
THE WIND ENERGY RESOURCES IN CHINA is enriched, about 1,000,000,000 kilowatts of the wind energy content that can be developed.As country is continued to increase to clear
The development support dynamics of the clean energy, Wind Power In China industry realizes the development advanced by leaps and bounds, and Wind Power In China grid connection capacity jumps rapidly
Rank first in the world.The development of high speed brings the outburst of a large amount of technical problems, high-capacity wind power plant can safety grid-connection into based on
Concerned issue is wanted, and the harmonic wave of wind energy turbine set then directly influences the grid-connected quality of power supply with resonance problems.
The content of the invention
The invention provides a kind of method and system for determining blower fan and electrical network resonance, can be by grid-connected in blower fan
It is superimposed harmonic voltage at point to obtain impedance of the blower fan under each frequency harmonics voltage.Due to resistance of the electrical network under each harmonic frequency
Anti- is known, can determine that blower fan whether there is resonance with electrical network in harmonic frequency range of interest accordingly.
A first aspect of the present invention provides a kind of method for determining blower fan and electrical network resonance, including：By different frequency
Multiple harmonic voltages be added to respectively on the fundamental voltage at blower fan grid entry point；Blower fan is obtained respectively responsive to different frequency
Multiple harmonic currents of multiple harmonic voltages；Determine blower fan at each frequency based on multiple harmonic voltages and multiple harmonic currents
The amplitude of impedance and phase angle；The amplitude of the impedance at each frequency based on determined by and phase angle judge whether are blower fan and electrical network
There is resonance.
A second aspect of the present invention provides a kind of system for determining blower fan and electrical network resonance, including：Harmonic generation mould
Block, multiple harmonic voltages of different frequency are added to respectively on the fundamental voltage at blower fan grid entry point；Electric current obtains module, obtains
Obtain multiple harmonic currents of the blower fan respectively responsive to multiple harmonic voltages of different frequency；Impedance determining module, based on multiple humorous
Wave voltage and multiple harmonic currents determine the amplitude of impedance of the blower fan at each frequency and phase angle；Resonance determination module, is based on
Determined by impedance at each frequency amplitude and phase angle judge that blower fan whether there is resonance with electrical network.
Embodiments in accordance with the present invention, when it is determined that blower fan has resonance with electrical network in harmonic frequency range of interest
In the case of, the impedance operator of blower fan can be changed by the parameter of adjustment blower fan, so as to eliminate the resonance of blower fan and electrical network.
Description of the drawings
Fig. 1 illustrates the signal Organization Chart of the system that blower fan is constituted with electrical network；
Fig. 2 is illustrated is used for according to an embodiment of the invention the flow chart for determining blower fan and the method for electrical network resonance；
Fig. 3 a illustrate the impedance characteristic of blower fan according to an embodiment of the invention and electrical network；
Fig. 3 b illustrate the impedance characteristic of blower fan according to another embodiment of the present invention and electrical network；
Fig. 4 is illustrated is used for according to an embodiment of the invention the block diagram for determining blower fan and the system of electrical network resonance；
Fig. 5 is to illustrate the ability to realize the method and system for determining blower fan and electrical network resonance according to embodiments of the present invention
Computing device exemplary hardware architecture structure chart.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, the scope of protection of the invention is belonged to.
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is just for the sake of by illustrating that the example of the present invention is better understood to provide to the present invention.The present invention is never limited
In any concrete configuration and algorithm set forth below, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of part and algorithm.In the the accompanying drawings and the following description, known structure and skill is not shown
Art, to avoid that unnecessary obscuring is caused to the present invention.
The electrical equipment with nonlinear characteristic can cause harmonic wave in distribution system, be contaminated electrical network, cause electrical network
The problems such as power attenuation increase, circuit and apparatus overheat.More serious situation is that blower fan may be in a certain harmonic frequency with electrical network
Nearby there is resonance, this can increase harmonic distortion, may finally cause the consequences such as equipment burnout, grid cut-off.Therefore, eliminate humorous
Shake and have very important significance.
Fig. 1 is schematic block Figure 100 of the system that blower fan is constituted with electrical network.As shown in fig. 1, system 100 includes draught fan group
Collection 101 and electrical network 102, wherein blower fan cluster include multiple blower fan 101-1,101-2 ..., 101-n.Within the system, electrical network
Impedance operator be known, generally can obtain from grid company.And the impedance operator of blower fan cluster is by the shadow of many factors
Ring, for example, quantity of blower fan etc. in parameter, the blower fan cluster of single blower fan.
In the case where many Fans concentration is grid-connected, in the impedance of points of common connection electrical network blower fan will be largely affected
Grid-connected characteristic.Some area power grids and blower fan short-circuit ratio already close to 3 or so, the impedance of electrical network may be with blower fan impedance
Generation resonance.With continuing to increase for this class local wind motor assembling machine capacity, short-circuit ratio constantly reduces, and this area starts
There is the problem of subsynchronous concussion, cause the extensive off-grid of wind-powered electricity generation, seriously threatened the safe operation of system.
Embodiments of the invention are electric by the harmonic wave for being superimposed each frequency at blower fan grid entry point a in circuit system 100
The method of pressure obtaining impedance (that is, the impedance operator of blower fan) of the blower fan under each harmonic frequency, by the wind to being obtained
The impedance operator of machine is compared to determine blower fan with electrical network in frequency range of interest with the impedance operator of known electrical network
It is interior with the presence or absence of resonance.If it find that there is resonance with electrical network under a certain harmonic frequency in blower fan, then by adjusting fan parameter
To eliminate the resonance at the frequency, so that it is guaranteed that the safe operation of system.
The method of the present invention as described below can be implemented on the blower fan of entity, it is also possible to soft by electric system simulation
Part to the model of the blower fan in system 100 and electrical network carrying out emulation experiment.In an embodiment of the present invention, it is soft to guarantee emulation
Part output result is consistent with actual blower fan, and the control system of blower fan model is using generation used in the control system of true blower fan
Code, and take into full account the damping characteristic of transmission line.
Fig. 2 is illustrated is used for according to an embodiment of the invention the flow process for determining the method 200 that blower fan occurs resonance with electrical network
Figure.As shown in Figure 2, method 200 is comprised the following steps：S201, multiple harmonic voltages of different frequency are added to respectively wind
On fundamental voltage at machine grid entry point；S202, obtains blower fan respectively responsive to the multiple of multiple harmonic voltages of the different frequency
Harmonic current；S203, based on multiple harmonic voltages and multiple harmonic currents determine impedance of the blower fan at each frequency amplitude and
Phase angle；S204, the amplitude of the impedance at each frequency based on determined by and phase angle judge blower fan with electrical network with the presence or absence of humorous
Shake.
In step s 201, it is notable that the voltage being related in the present invention (including fundamental voltage, harmonic voltage etc.)
It is three-phase with electric current (including fundamental current, harmonic current etc.).The amplitude of harmonic voltage can be the amplitude of fundamental voltage
5%-10% because the result that FFT draws can be caused larger with the error of actual result during less than 5%, and be more than
10% can cause blower fan to run.For example, the amplitude of harmonic voltage can be the 8% of fundamental voltage amplitude.
In certain embodiments, it from first threshold frequency to the step-length of Second Threshold frequency is predetermined that above-mentioned different frequency is
Multiple frequencies of value, wherein, the frequency model of the blower fan impedance operator required for first threshold frequency and the restriction of Second Threshold frequency
Enclose.There is power network fluctuation in 23Hz and 77Hz in view of the larger area of Wind turbines installed capacity, present invention is primarily concerned with
Harmonic wave in the range of 5-200Hz.Certainly, the method applied in the present invention 200 can be used for obtaining in any harmonic frequency range
The impedance operator of blower fan.
In order to obtain the harmonic impedance needed in frequency range, need to be superimposed respectively multiple harmonic voltages of different frequency simultaneously
Carry out that measurement is repeated several times.The frequency step of harmonic voltage can as needed be set.Usually, larger measurement step-length can contract
Short time of measuring, but certainty of measurement is relatively low；Less measurement step-length can cause time of measuring longer, but can be relatively defined
True measurement result.After selected frequency step, then from low to high, according to step-length harmonic voltage is sequentially overlapped.By measuring and remembering
Record relevant experimental data to calculate blower fan impedance, this be further described below.
In step S202, in certain embodiments, multiple harmonic voltages of the blower fan respectively responsive to different frequency are obtained
Multiple harmonic currents include：For the harmonic voltage of each frequency, the electric current of blower fan is sampled, wherein the electric current is loud
Should be in the fundamental current of fundamental voltage and the harmonic current sum of the harmonic voltage in response to the frequency；The electric current sampled is entered
Row fast Fourier transform (FFT) is obtaining harmonic current of the blower fan in response to the harmonic voltage of the frequency.It should be understood that to sampling
Electric current carry out FFT be for the harmonic wave of the fundamental current in response to fundamental voltage and the harmonic voltage in response to the frequency electricity
Stream separates in frequency, so that it is determined that in response to the harmonic current of harmonic voltage.
In certain embodiments, sampling can be carried out in electric current into after stable state, and the electric current sampled is pre- timing
Between in section sampling electric current.The length and sample frequency of the predetermined amount of time sampled can be wanted according to the precision of FFT
Ask to determine.In general, the sampling time is longer, sample frequency is higher, and the precision of FFT is higher.Certainly, it is contemplated that sample
The cost that analysis and FFT are calculated, sampling time and sample frequency typically be configured to meet error requirements.For example,
In one example, the sampling time can be set to 1s, sample frequency is set to into 5KHz.
In step S203, after harmonic current of the blower fan in response to the harmonic voltage of the frequency is obtained, according to ohm
Law, with the harmonic voltage of the frequency blower fan impedance of the frequency can be obtained divided by corresponding harmonic current.
In step S204, as described above, the impedance of electrical network is known, typically can be from blower fan power plant or grid company
Obtain, therefore obtaining blower fan in the case of the amplitude of the impedance of each frequency and phase angle, can directly according to numerical value with it is electric
The resistance value of net relatively judging whether blower fan and electrical network occur resonance.It is equal with electric network impedance amplitude in blower fan impedance, and
In the case of 180 ° of carrier phase shift, determine whether blower fan occurs resonance with electrical network.In practice, can be by resulting blower fan
The impedance of each frequency amplitude and phase angle be depicted as amplitude and phase curve, now can intuitively by judging blower fan amplitude
Curve judges wind with the point of intersection blower fan impedance phase angle of electrical network amplitude curve with whether electric network impedance phase angle differs 180 °
Whether machine there is resonance with electrical network.
In certain embodiments, deposit in case of resonance in blower fan and electrical network, can by adjust the parameter of blower fan come
Change the impedance of the blower fan, so as to eliminate the resonance of blower fan and electrical network.Wherein, the parameter of blower fan includes the control parameter of blower fan
(for example, voltage control ratio/integral parameter, current control ratio/integral parameter, lock phase control ratio/integral parameter etc.) or
Operational factor (for example, motor speed, change propeller angle, pylon stress etc.).
Impedance of the blower fan under each harmonic frequency can be obtained by the method for the present invention, can be determined that accordingly blower fan with
Electrical network whether there is resonance, and the resonance that can be eliminated by adjusting fan parameter in harmonic frequency range of interest, from
And guarantee the safe operation of system.
It should be understood that, although can also fit with separate unit blower fan as the method according to the invention, the method is exemplified above
For many Fans.
Method 200 is shown with reference to instantiation.
In one embodiment, shown in curve shown in broken lines in the amplitude and phase curve such as Fig. 3 b of electric network impedance.
It is f that frequency is superimposed at blower fan grid entry point0=10Hz, phase place differ respectively 120 ° of three phase harmonic voltage.To being superimposed harmonic wave electricity
Electric current and voltage on pressure rear fan is sampled, and sample frequency is 5KHz.FFT is carried out to the sample that sampling is obtained, is obtained
To in harmonic frequency f0Three phase harmonic voltage and three phase harmonic electric current on place's blower fan.Based on the three-phase at the resulting frequency
Harmonic voltage and three phase harmonic electric current, it is f that can calculate blower fan in harmonic frequency by Ohm's law0When impedance Z0。
Frequency step is set to into Δ f=1Hz, next blower fan is obtained respectively in f according to above-mentioned flow process1=f0+Δf、f2
=f0+2Δf、……、fn=f0Impedance at+n Δ f=200Hz.Afterwards, the impedance of each frequency for being obtained is depicted as into resistance
Anti- amplitude and phase curve, it is shown in solid in such as Fig. 3 a.
Can intuitively find out from Fig. 3 a, in fxBlower fan impedance is equal with electric network impedance amplitude at=95Hz, phase angle phase
180 ° are differed from, i.e., blower fan occurs resonance with electrical network when harmonic frequency is 95Hz.
It is to eliminate resonance it is determined that blower fan and electrical network are deposited in case of resonance, the parameter of blower fan can be adjusted,
For example, to the control parameter of blower fan (for example, voltage control ratio/integral parameter, current control ratio/integral parameter, lock phased
One or more of ratio/integral parameter processed etc.) or operational factor (for example, motor speed, change propeller angle, pylon stress etc.)
It is adjusted.Fig. 3 b show the impedance characteristic that rear fan and electrical network are adjusted to fan parameter, and wherein solid line is illustrated
Curve represent blower fan impedance characteristic, curve shown in phantom represents the amplitude of electric network impedance and phase angle.From Fig. 3 b
Can intuitively find out, after parameter adjustment, the impedance characteristic of blower fan does not have amplitude with the impedance characteristic of electrical network
Close, 180 ° of carrier phase shift intersection point, i.e. blower fan and electrical network are all without generation resonance at each harmonic frequency.
Fig. 4 is illustrated is used for according to an embodiment of the invention the block diagram for determining blower fan and the system 400 of electrical network resonance.As schemed
Shown in 4, system 400 includes：Harmonic generation module 401, multiple harmonic voltages of different frequency blower fan that is added to respectively is grid-connected
On fundamental voltage at point；Electric current obtains module 402, obtains blower fan respectively responsive to many of multiple harmonic voltages of different frequency
Individual harmonic current；Impedance determining module 403, determines blower fan at each frequency based on multiple harmonic voltages and multiple harmonic currents
The amplitude of impedance and phase angle；Resonance determination module 404, the amplitude of the impedance at each frequency based on determined by and phase angle are sentenced
Subduing the wind syndrome machine whether there is resonance with electrical network.
Electric current in system 400 obtains module 403 also to be included：Sampling module 4031, samples to the electric current of blower fan；With
And FFT module 4032, carry out FFT to obtain blower fan in response to the humorous of the harmonic voltage of the frequency according to the electric current sampled
Ripple electric current.In certain embodiments, system 400 alternatively includes parameter adjustment module, for depositing in case of resonance, leads to
Cross and adjust the parameter of the blower fan to change the impedance of the blower fan, so as to eliminate the resonance of blower fan and electrical network.
Can be by computing device reality with reference to the method and system for determining blower fan and electrical network resonance of Fig. 2 to Fig. 4 descriptions
It is existing.Fig. 5 be illustrate the ability to realize it is according to embodiments of the present invention based on determining method and system of the blower fan with electrical network resonance
The structure chart of the exemplary hardware architecture of calculation equipment.As shown in figure 5, computing device 500 includes input equipment 501, input interface
502nd, central processing unit 503, memorizer 504, output interface 505 and outut device 506.Wherein, input interface 502, central authorities
Processor 503, memorizer 504 and output interface 505 are connected with each other by bus 510, input equipment 501 and outut device
506 are connected respectively by input interface 502 and output interface 505 with bus 510, so with the other assemblies of computing device 500
Connection.Specifically, the receives input information of input equipment 501 (for example, sample information), and letter will be input into by input interface 502
Breath is sent to central processing unit 503；Central processing unit 503 is based on the computer executable instructions stored in memorizer 504 to defeated
Enter information to be processed to generate output information, output information is temporarily or permanently stored in memorizer 504, Ran Houtong
Cross output interface 505 and output information is sent to into outut device 506；Outut device 506 is by output information output to computing device
500 outside is for users to use.
That is, shown in Fig. 4 for determining that blower fan can also be implemented as including with the system of electrical network resonance：Storage
There is the memorizer of computer executable instructions；And processor, the processor can be real when computer executable instructions are performed
In conjunction with the method and system for determining blower fan and electrical network resonance of Fig. 2 descriptions.Here, processor can be based on input information
Computer executable instructions are performed, so as to realize combining the method and system for determining blower fan and electrical network resonance of Fig. 2 descriptions.
Functional device shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
Close.When realizing in hardware, its may, for example, be electronic circuit, special IC (ASIC), appropriate firmware, insert
Part, function card etc..When being realized with software mode, the element of the present invention is used to perform program or the generation of required task
Code section.Program or code segment can be stored in machine readable media, or are being passed by the data signal carried in carrier wave
Defeated medium or communication links send.
The present invention can be realized in other specific forms, without deviating from its spirit and essential characteristics.For example, particular implementation
Algorithm described in example can be changed, and system architecture is without departing from the essence spirit of the present invention.Therefore, it is current
Embodiment be all counted as being exemplary rather than in all respects it is determinate, the scope of the present invention by claims rather than
Foregoing description is defined, also, the whole changes fallen in the range of the implication and equivalent of claim are so as to all be included in
Among the scope of the present invention.
Claims (16)
1. a kind of method for determining blower fan and electrical network resonance, it is characterised in that include：
Multiple harmonic voltages of different frequency are added to respectively on the fundamental voltage at blower fan grid entry point；
Obtain multiple harmonic currents of the blower fan respectively responsive to multiple harmonic voltages of the different frequency；
The amplitude of impedance of the blower fan at each frequency is determined based on the plurality of harmonic voltage and the plurality of harmonic current
And phase angle；
The amplitude of the impedance at each frequency based on determined by and phase angle judge the blower fan with the electrical network with the presence or absence of humorous
Shake.
2. the method for claim 1, it is characterised in that also include：Depositing in case of resonance, it is described by adjustment
The parameter of blower fan changing the impedance operator of the blower fan, so as to eliminate the resonance of blower fan and electrical network.
3. the method for claim 1, it is characterised in that the amplitude of the harmonic voltage is the amplitude of the fundamental voltage
5%-10%.
4. the method for claim 1, it is characterised in that the different frequency is from first threshold frequency to Second Threshold
The step-length of frequency is multiple frequencies of predetermined value.
5. method as claimed in claim 4, it is characterised in that the first threshold frequency is 5Hz, the Second Threshold frequency
For 200Hz.
6. the method for claim 1, it is characterised in that obtain the blower fan respectively responsive to many of the different frequency
Multiple harmonic currents of individual harmonic voltage include：
For the harmonic voltage of each frequency, the electric current of the blower fan is sampled, wherein the electric current is in response in described
The harmonic current sum of the fundamental current of fundamental voltage and the harmonic voltage in response to the frequency；
The electric current sampled is carried out into fast Fourier transform to obtain the blower fan in response to the harmonic voltage of the frequency
Harmonic current.
7. method as claimed in claim 6, it is characterised in that the sampling is carried out in the electric current into after stable state, and
The electric current sampled is the electric current of sampling in predetermined amount of time.
8. method as claimed in claim 2, it is characterised in that the parameter of the blower fan includes the control parameter and blower fan of blower fan
Operational factor.
9. a kind of system for determining blower fan and electrical network resonance, it is characterised in that include：
Harmonic generation module, multiple harmonic voltages of different frequency are added to respectively on the fundamental voltage at blower fan grid entry point；
Electric current obtains module, obtains multiple harmonic waves electricity of the blower fan respectively responsive to multiple harmonic voltages of the different frequency
Stream；
Impedance determining module, determines the blower fan at each frequency based on the plurality of harmonic voltage and the plurality of harmonic current
Impedance amplitude and phase angle；
Resonance determination module, the amplitude of the impedance at each frequency based on determined by and phase angle judge the blower fan with the electricity
Net whether there is resonance.
10. system as claimed in claim 9, it is characterised in that also including parameter adjustment module, the parameter adjustment module is being deposited
In case of resonance, by the impedance operator for adjusting the parameter of the blower fan to change the blower fan, to eliminate blower fan with electricity
The resonance of net.
11. systems as claimed in claim 9, it is characterised in that the amplitude of the harmonic voltage is the width of the fundamental voltage
The 5%-10% of value.
12. systems as claimed in claim 9, it is characterised in that the different frequency is from first threshold frequency to the second threshold
The step-length of value frequency is multiple frequencies of predetermined value.
13. systems as claimed in claim 12, it is characterised in that the first threshold frequency is 5Hz, the Second Threshold frequency
Rate is 200Hz.
14. systems as claimed in claim 9, it is characterised in that the electric current obtains module also to be included：
Sampling module, for the harmonic voltage of each frequency, samples to the electric current of the blower fan, wherein the electric current is loud
The harmonic current sum of the fundamental current of fundamental voltage described in Ying Yu and the harmonic voltage in response to the frequency；
FFT module, the electric current sampled is carried out fast Fourier transform to obtain the blower fan in response to the humorous of the frequency
The harmonic current of wave voltage.
15. systems as claimed in claim 14, it is characterised in that the sampling is carried out in the electric current into after stable state, and
And the electric current sampled is the electric current of sampling in predetermined amount of time.
16. systems as claimed in claim 10, it is characterised in that the parameter of the blower fan includes the control parameter and wind of blower fan
The operational factor of machine.
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| CN201611269959.0A CN106645974A (en) | 2016-12-30 | 2016-12-30 | Method and system for determining resonance of wind turbine and power grid |
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| CN201611269959.0A CN106645974A (en) | 2016-12-30 | 2016-12-30 | Method and system for determining resonance of wind turbine and power grid |
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| CN108469575A (en) * | 2018-03-30 | 2018-08-31 | 全球能源互联网研究院有限公司 | Power oscillation risk checking method and system of the wind turbine through soft straight power grid transmitting system |
| CN109030950A (en) * | 2018-08-06 | 2018-12-18 | 南方电网科学研究院有限责任公司 | A kind of impedance scan method and system for power electronic equipment |
| CN110007146A (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 phase |
| 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 |
| CN110007143A (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 harmonic amplitude |
| 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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| 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 |
| CN110007142A (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 current harmonics amplitude |
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| CN110133371A (en) * | 2019-04-26 | 2019-08-16 | 青岛鼎信通讯股份有限公司 | A kind of power grid resonance point detecting method based on constant pressure source converter |
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| CN110007141B (en) * | 2019-04-26 | 2021-11-05 | 青岛鼎信通讯股份有限公司 | Resonance point detection method based on voltage and current harmonic similarity |
| CN110007145B (en) * | 2019-04-26 | 2021-11-05 | 青岛鼎信通讯股份有限公司 | Resonance point detection method based on constant voltage source converter and voltage current phase difference |
| CN110007143B (en) * | 2019-04-26 | 2021-11-30 | 青岛鼎信通讯股份有限公司 | Resonance point detection method based on voltage harmonic amplitude |
| CN110007142B (en) * | 2019-04-26 | 2021-11-30 | 青岛鼎信通讯股份有限公司 | Resonance point detection method based on current harmonic amplitude |
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