CN108535545A - A kind of pouring-in wide-band impedance measuring device of double resonance and its control method - Google Patents
A kind of pouring-in wide-band impedance measuring device of double resonance and its control method Download PDFInfo
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- CN108535545A CN108535545A CN201810314067.0A CN201810314067A CN108535545A CN 108535545 A CN108535545 A CN 108535545A CN 201810314067 A CN201810314067 A CN 201810314067A CN 108535545 A CN108535545 A CN 108535545A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a kind of pouring-in wide-band impedance measuring device of double resonance and its control methods, measuring device includes current disturbing injection unit, signal processing unit, wide-band impedance calculates and monitoring unit, wherein current disturbing injection unit is per mutually 6 sub- power module units of cascade, each mutually output accesses examining system by disturbing injection branch, the advantages of disturbance injection branch combines series resonance branch and parallel resonance branch, concatenated power module is enable to bear smaller fundamental voltage, current perturbation major part injected system, provides current disturbing source.Cascade H bridge converter controls power device conducting and the shutdown per phase H bridging parallel operations by phase-shifted SPWM Multilevel modulation using the quasi- ratio resonance control of outer voltage proportional integration current inner loop.Used control method makes system have higher reliability and faster dynamic response, meets the requirement that system is measured applied to megawatt-grade high-power occasion and broadband disturbance output impedance.
Description
Technical field
The present invention relates to the impedance measurement field in generation of electricity by new energy, especially a kind of pouring-in wide-band impedance of double resonance
Measuring device and its control method.
Background technology
As the environmental problems such as the increasingly depleted of fossil energy and global warming are aggravated, the development and utilization of new energy
As it is sought that source structure adjusts, realizes the optimal selection of sustainable development.Analyzing extensive generation of electricity by new energy equipment
When accessing power grid, stable operation and control that the impedance operator of power grid equips the power electronics such as wind-force, photovoltaic combining inverter
It has an important influence on.Ideally, power grid should show as ideal voltage source, and generation of electricity by new energy equipment should control as ideal
Current source, to avoid any impedance coupling interaction problem.However in practice, the new energy power station of China's large capacity is established more
The remote districts such as desert, farther out apart from power load.Since the electric network impedance that transformer and long power transmission line introduce is larger and new
The external characteristics of energy power generating equipment can not show as ideal current source, this will lead to the impedance and generation of electricity by new energy of light current net
Coupling interaction occurs for the impedance of equipment, influences the stable operation of grid-connected power generation system.Therefore, the impedance of generation of electricity by new energy equipment
Measurement has important practical significance to the stability study of large-scale new energy grid-connected power system.It is former needed for impedance analysis method
Beginning data are few and simple and effective, but the existing impedance operator measurement method in home and abroad and equipment are mainly directed towards in low-voltage, low capacity
Generation of electricity by new energy equipment and micro-grid system.In generation of electricity by new energy base, power generating equipment external characteristics difference is big, and grid disturbance
With factors such as the new energy energy fluctuations power generating equipment impedance operator is measured more complicated, lack to megawatt-level wind unit,
The impedance operator data of the power generating equipments such as photovoltaic generation unit, it is difficult to meet power generating equipment simulation model in generation of electricity by new energy base
Required fining requirement, and the accurate measurement method of high pressure, MW class, wide-band impedance characteristic is at home and abroad in equipment
Blank, key technology are urgently broken through.For this demand, the present invention proposes a kind of double resonance injection based on modularization cascade structure
Formula wide-band impedance measuring device.
Invention content
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of pouring-in wideband of double resonance
Band impedance measurement device and its control method inject current perturbation in such a way that parallel connection is injected to examining system, double resonance
Injection mode combines the advantages of series resonance branch and parallel resonance branch so that concatenated power module bears smaller fundamental wave
Voltage, current perturbation major part injected system, and concatenated power module can directly take electricity by controlling from system, without additional
DC source is provided, cost had not only been reduced but also had reduced equipment volume.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of pouring-in wideband-elimination of double resonance
Anti- measuring device, including sequentially connected signal processing unit, wide-band impedance calculate and monitoring unit, current disturbing injection list
Member；The current disturbing injection unit is per mutually cascading 6 sub- power module units, after the sub- power module of each phase is unit cascaded
Power grid is accessed by disturbing injection branch；Every sub- power module unit is made of single-phase H bridges DC/AC converters.
Correspondingly, the present invention also provides a kind of control method of the pouring-in wide-band impedance measuring device of double resonance, packets
Include following steps：
1) straight to the single-phase H bridges DC/AC converters of sub- power module unit cascade type in the starting point in each sampling period
Flow side total voltage Udca、Udcb、UdccAnd output current iLa、iLb、iLcIt is sampled respectively；
2) by voltage command signal Urefa、Urefb、UrefcThe single-phase H bridges DC/AC converter direct currents of cascade connection type obtained with sampling
Side total voltage Udca、Udcb、UdccCorresponding work is poor, obtains voltage error amount Δ Ua、ΔUb、ΔUc；
3) by voltage error amount Δ Ua、ΔUb、ΔUcThrough outer voltage PI control, resulting value after amplitude limit link with often phase
Unit sinusoidal signal be multiplied, obtain the watt current i of stable DC sideap、ibp、icp；
4) by watt current iap、ibp、icpIt is superimposed with the every phase current perturbation instruction set according to specific measurement demand respectively
iar、ibr、icr, obtain current reference value irefLa、irefLb、irefLc；
5) by current reference value irefLa、irefLb、irefLcThe output current i obtained with samplingLa、iLb、iLcCorresponding work is poor, obtains
To current error amount Δ iLa、ΔiLb、ΔiLc；
6) by current error amount Δ iLa、ΔiLb、ΔiLcAmplitude limit exports after the quasi- PR controls of current inner loop, and is with modulation
Number kPWMModulated signal u is obtained as productra、urb、urc；
7) by the DC voltage average value U of each single-phase H bridges DC/AC converters of three-phaseavga、Uavgb、UavgcRespectively with three
The DC voltage U of each single-phase H bridges DC/AC converters of phasedcan、Udcbn、UdccnIt is poor to make, and gained difference is multiplied by ratio respectively
Example coefficient, then by product, correspondence is multiplied by three-phase watt current i respectivelyap、ibp、icp, obtain each single-phase H bridges DC/AC changes of three-phase
The modulation wave signal Δ u that parallel operation DC voltage is divided equallyan、Δubn、Δucn；
8) by modulated signal ura、urb、urcWith the modulation wave signal Δ uan、Δubn、ΔucnSuperposition, obtains total modulation
Signal uran、urbn、urcn, to uran、urbn、urcnPhase-shifted SPWM Multilevel modulation is carried out with triangular carrier, obtains single-phase H bridges
The duty cycle signals T of inverter switching device pipe in DC/AC convertersra1、Tra2…Tra6、Trb1、Trb2…Trb6、Trc1、Trc2…Trc6,
Control inverter circuit switching tube being opened and turning off.
In step 1), single-phase H bridges DC/AC converter DC side total voltages Udca、Udcb、UdccCalculation formula be：
Wherein, n is the DC voltage average value U per mutually each sub- power module element numberavga、Uavgb、UavgcI.e. per phase
DC side total voltage Udca、Udcb、UdccDivided by per mutually sub- power module unit number.
In step 6), the transmission function of quasi- PR controls is：Wherein KpSubject to PR control
The proportionality coefficient of system, KiSubject to PR control integral coefficient, ωcFor resonant bandwidth, ω0For electrical network angular frequency.
Compared with prior art, the advantageous effect of present invention is that：Present invention accomplishes in generation of electricity by new energy base
Fining requirement needed for power generating equipment simulation model, compensates for the accurate measurement in high pressure, MW class, wide-band impedance characteristic
The advantages of method and blank on equipment, the injection mode of double resonance combines series resonance branch and parallel resonance branch, make
Smaller fundamental voltage, current perturbation major part injected system can be born by obtaining concatenated power module, and concatenated power module can
Directly to take electricity from system by control, without being additionally provided DC source, cost was not only reduced but also had reduced equipment volume.
Description of the drawings
Fig. 1 is a kind of pouring-in wide-band impedance measuring device system construction drawing of double resonance of one embodiment of the invention；
Fig. 2 is a kind of control method controller chassis of the pouring-in wide-band impedance measuring device of double resonance of one embodiment of the invention
Figure；
Fig. 3 is injection current perturbation source in parallel method schematic diagram；
Fig. 4 is measuring system equivalent-circuit model figure under dq coordinates；
Fig. 5 is the Z for hindering emotional resistance under dq coordinate systemsdd(s)；
Fig. 6 is the Z for hindering emotional resistance under dq coordinate systemsdq(s)；
Fig. 7 is the Z for hindering emotional resistance under dq coordinate systemsqd(s)。
Specific implementation mode
As shown in Figure 1, one embodiment of the invention includes current disturbing injection unit, signal processing unit, wide-band impedance
It calculates and monitoring unit, wherein current disturbing injection unit includes multiple power module units, LC filter circuits, disturbs injection branch
Road and broadband output control unit；Described device is constituted by multiple power modules are unit cascaded, per mutually cascade 6 in three-phase
Sub- power module unit, each mutually output access examining system by disturbing injection branch, provide current disturbing source；The LC filtering
Circuit, in filter capacitor branch series damping resistor ra、rb、rc, avoid that resonance phenomena occurs；The disturbance injection branch is La1
With Ca1For parallel resonance in fundamental frequency, it is a maximum to make parallel branch impedance of fundamental frequency, reduces the fundamental wave electricity that cascaded H-bridges are born
Pressure；La2With Ca2Series resonance bypasses fundamental current, chooses suitable inductance capacitance parameter in addition and to disturb in fundamental frequency
Electric current is through parallel resonance branch injected system, without flowing to series arm；The sub- power module unit is noted by disturbing
Enter branch with power grid to be connected, and is made of single-phase H bridges DC/AC converters；The examining system is the wind-force hair being connected with power grid
Denso is standby, including wind turbine, DFIG, rectifier bridge, inverter bridge, transformer.ua、ub、ucSubmodule, which is cascaded, for three-phase exports phase voltage,
Inductance La、Lb、Lc, capacitance Ca、Cb、CcWith resistance ra、rb、rcCompose in parallel LC filters, iLa、iLb、iLcFor output current phase, N
For zero potential neutral point, LlineFor line inductance, RlineFor line resistance.
Fig. 2 block diagrams in order to control, in the starting point in each sampling period, to the pouring-in wide-band impedance measuring device of double resonance
Sub- power module unit cascade type H bridging parallel operation DC side total voltages Udca、Udcb、Udcc, output current iLa、iLb、iLcPoint
It is not sampled, dsp controller will be given by the transformed data of AD converter, by voltage command signal Urefa、Urefb、
UrefcThe DC voltage U obtained with samplingdca、Udcb、UdccIt is poor to make, and obtains voltage error amount Δ Ua、ΔUb、ΔUc；Voltage error
Measure Δ Ua、ΔUb、ΔUcIt is multiplied and can obtain with the unit sinusoidal signal per phase after amplitude limit link through outer voltage PI control resulting values
The watt current i of stable DC sideap、ibp、icp, by watt current iap、ibp、icpRespectively with set according to specific measurement demand
I is instructed per phase current perturbationar、ibr、icrSuperposition, obtains current reference value irefLa、irefLb、irefL, by current reference value irefLa、
irefLb、irefLcThe output current i obtained with samplingLa、iLb、iLcIt is poor to make, and obtains current error amount Δ iLa、ΔiLb、ΔiLc；It will
Current error amount Δ iLa、ΔiLb、ΔiLcAmplitude limit exports after the quasi- PR controls of current inner loop, and quasi- PR transmission functions are：
Wherein KpSubject to PR control proportionality coefficient, KiSubject to PR control integral coefficient, ωcFor resonant bandwidth, ω0For
Electrical network angular frequency.
Result after amplitude limit output and index of modulation kPWMModulated signal u is obtained as productra、urb、urc, by each list of three-phase
The DC voltage average value U of phase H bridge DC/AC convertersavga、Uavgb、UavgcIt is converted respectively with each single-phase H bridges DC/AC of three-phase
The DC voltage U of devicedcan、Udcbn、UdccnIt is poor to make, and gained difference is multiplied by proportionality coefficient respectively, then multiplies product respectively
With three-phase watt current iap、ibp、icpObtain the modulating wave letter that each single-phase H bridges DC/AC converter DC voltages of three-phase are divided equally
Number Δ uan、Δubn、Δucn；Modulated signal ura、urb、urcWith capacitor voltage balance modulated signal Δ uan、Δubn、ΔucnSuperposition
Obtain total modulated signal uran、urbn、urcn, to uran、urbn、urcnThe more level tune of phase-shifted SPWM are carried out with triangular carrier
System, obtains the duty cycle signals T of inverter switching device pipe in Cascade H bridge converterra1、Tra2…Tra6、Trb1、Trb2…Trb6、
Trc1、Trc2…Trc6, control opening and turning off for inverter circuit switching tube.
Fig. 3 is injection current perturbation source in parallel method schematic diagram, in figure, ipa、ipbAnd ipcFor current perturbation source；vpa、vpbWith
vpcThe voltage responsive generated for current perturbation source；ipma、ipmb、ipmc, be diverted to for current perturbation the electricity of generation of electricity by new energy equipment
Stream；ipga、ipgb、ipgcThe electric current on AC network is diverted to for current perturbation；Zga(s)、Zgb(s) and Zgc(s) it is alternating current
The equiva lent impedance of net；Ima、ImbAnd ImcFor the grid-connected current of generation of electricity by new energy equipment；Zma(s)、Zmb(s) and Zmc(s) it is new energy
The equiva lent impedance of power generating equipment.Circuit equation of the generation of electricity by new energy equipment side under natural system of coordinates can be obtained according to fig. 3 is：
In formula：S=j ω, ω are the angular frequency for disturbing sinusoidal current.Specifically be：ipma(s)、ipmb(s)、ipmc
(s)、vpa(s)、vpb(s) and vpc(s) fundametal compoment of AC network is not all contained, that is to say, that this tittle is by band resistance filter
What wave device etc. was filtered.
To the transformation matrix T of the equal premultiplication abc coordinate systems in (1) both sides to dq coordinate systems, generation of electricity by new energy equipment side can be obtained and existed
Circuit equation under dq rotating coordinate systems is：
In formula：Zmdd(s)、Zmdq(s)、Zmqd(s) and Zmqq(s) it is each element of the impedance matrix of generation of electricity by new energy equipment.
Abc coordinate systems to dq coordinate systems transformation matrix TdqAs shown in (3).In formula：θ=ω t are the reference phase angle that initial phase angle is 0.
Fig. 4 hinders Z of the emotional resistance under dq coordinate systemsdd(s)。
Fig. 5 hinders Z of the emotional resistance under dq coordinate systemsdq(s)。
Fig. 6 hinders Z of the emotional resistance under dq coordinate systemsqd(s)。
Fig. 7 hinders Z of the emotional resistance under dq coordinate systemsqq(s)。
When generation of electricity by new energy equipment resistance and inductance series connection Rm+sLmInstead of when, Impedance Moment of the impedance under dq coordinates
Battle array expression formula be：
By Fig. 4 Fig. 7 to find out：Measuring impedance and practical impedance can coincide, and demonstrate the validity of institute's extracting method.
Claims (4)
1. a kind of pouring-in wide-band impedance measuring device of double resonance, which is characterized in that including sequentially connected signal processing list
Member, wide-band impedance calculate and monitoring unit, current disturbing injection unit；The current disturbing injection unit is per mutually cascade 6
Sub- power module unit passes through after the sub- power module of each phase is unit cascaded and disturbs injection branch and access power grid；Per height
Power module unit is made of single-phase H bridges DC/AC converters.
2. a kind of control method of the pouring-in wide-band impedance measuring device of double resonance, which is characterized in that include the following steps：
1) in the starting point in each sampling period, to the single-phase H bridges DC/AC converter DC sides of sub- power module unit cascade type
Total voltage Udca、Udcb、UdccAnd output current iLa、iLb、iLcIt is sampled respectively；
2) by voltage command signal Urefa、Urefb、UrefcThe single-phase H bridges DC/AC converter DC sides of cascade connection type obtained with sampling are total
Voltage Udca、Udcb、UdccCorresponding work is poor, obtains voltage error amount Δ Ua、ΔUb、ΔUc；
3) by voltage error amount Δ Ua、ΔUb、ΔUcIt is controlled through outer voltage PI, list of the resulting value after amplitude limit link with every phase
Position sinusoidal signal is multiplied, and obtains the watt current i of stable DC sideap、ibp、icp；
4) by watt current iap、ibp、icpIt is superimposed with respectively and i is instructed according to every phase current perturbation that specific measurement demand is setar、
ibr、icr, obtain current reference value irefLa、irefLb、irefLc；
5) by current reference value irefLa、irefLb、irefLcThe output current i obtained with samplingLa、iLb、iLcCorresponding work is poor, obtains electricity
Stream error amount Δ iLa、ΔiLb、ΔiLc；
6) by current error amount Δ iLa、ΔiLb、ΔiLcAmplitude limit exports after current inner loop quasi- PR control, and with index of modulation kPWM
Modulated signal u is obtained as productra、urb、urc；
7) by the DC voltage average value U of each single-phase H bridges DC/AC converters of three-phaseavga、Uavgb、UavgcRespectively with three-phase
The DC voltage U of each single-phase H bridges DC/AC convertersdcan、Udcbn、UdccnIt is poor to make, and gained difference is multiplied by ratio system respectively
Number, then by product, correspondence is multiplied by three-phase watt current i respectivelyap、ibp、icp, obtain each single-phase H bridges DC/AC converters of three-phase
The modulation wave signal Δ u that DC voltage is divided equallyan、Δubn、Δucn；
8) by modulated signal ura、urb、urcWith the modulation wave signal Δ uan、Δubn、ΔucnSuperposition, obtains total modulated signal
uran、urbn、urcn, to uran、urbn、urcnPhase-shifted SPWM Multilevel modulation is carried out with triangular carrier, obtains single-phase H bridges DC/
The duty cycle signals T of inverter switching device pipe in AC convertersra1、Tra2…Tra6、Trb1、Trb2…Trb6、Trc1、Trc2…Trc6, control
Inverter circuit switching tube being opened and turning off.
3. according to the method described in claim 2, it is characterized in that, in step 1), single-phase H bridges DC/AC converter DC sides are total
Voltage Udca、Udcb、UdccCalculation formula be：
Wherein, n is the DC voltage average value U per mutually each sub- power module element numberavga、Uavgb、UavgcI.e. per phase direct current
Side total voltage Udca、Udcb、UdccDivided by per mutually sub- power module unit number.
4. according to the method described in claim 2, it is characterized in that, in step 6), the transmission function of quasi- PR controls is：Wherein KpSubject to PR control proportionality coefficient, KiSubject to PR control integral coefficient, ωc
For resonant bandwidth, ω0For electrical network angular frequency.
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| CN109412178A (en) * | 2018-10-19 | 2019-03-01 | 湖南大学 | A kind of switching control method of high-voltage large-capacity impedance measurement equipment |
| CN109459615A (en) * | 2018-10-19 | 2019-03-12 | 湖南大学 | High pressure impedance measurement device and control method based on cascade multi-level converter |
| CN109738703A (en) * | 2018-11-15 | 2019-05-10 | 湖南大学 | High pressure wide-band impedance measuring device and its control method |
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| CN111025023A (en) * | 2019-12-19 | 2020-04-17 | 西南交通大学 | Disturbance energy limit value selection method for injection type harmonic impedance measurement |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010115018A (en) * | 2008-11-06 | 2010-05-20 | Mitsubishi Electric Corp | Controller of ac-powered vehicle |
| CN103018612A (en) * | 2012-12-31 | 2013-04-03 | 国家电网公司 | Full-function electric-energy quality comprehensive test platform |
| CN105699780A (en) * | 2016-01-05 | 2016-06-22 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Grid-connected inverter commercial power impedance detection method and power factor correction method and device |
| CN106443185A (en) * | 2015-08-05 | 2017-02-22 | 艾默生网络能源有限公司 | Three-phase AC system impedance measurement method and device |
| CN106526328A (en) * | 2016-12-08 | 2017-03-22 | 浙江大学 | Generalized impedance measurement and calculation method applicable to power grid and networking equipment |
-
2018
- 2018-04-10 CN CN201810314067.0A patent/CN108535545B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010115018A (en) * | 2008-11-06 | 2010-05-20 | Mitsubishi Electric Corp | Controller of ac-powered vehicle |
| CN103018612A (en) * | 2012-12-31 | 2013-04-03 | 国家电网公司 | Full-function electric-energy quality comprehensive test platform |
| CN106443185A (en) * | 2015-08-05 | 2017-02-22 | 艾默生网络能源有限公司 | Three-phase AC system impedance measurement method and device |
| CN105699780A (en) * | 2016-01-05 | 2016-06-22 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Grid-connected inverter commercial power impedance detection method and power factor correction method and device |
| CN106526328A (en) * | 2016-12-08 | 2017-03-22 | 浙江大学 | Generalized impedance measurement and calculation method applicable to power grid and networking equipment |
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|---|---|---|---|---|
| CN109459615A (en) * | 2018-10-19 | 2019-03-12 | 湖南大学 | High pressure impedance measurement device and control method based on cascade multi-level converter |
| CN109412178A (en) * | 2018-10-19 | 2019-03-01 | 湖南大学 | A kind of switching control method of high-voltage large-capacity impedance measurement equipment |
| CN109412178B (en) * | 2018-10-19 | 2021-04-30 | 湖南大学 | Switching control method of high-voltage high-capacity impedance measurement equipment |
| CN109738703A (en) * | 2018-11-15 | 2019-05-10 | 湖南大学 | High pressure wide-band impedance measuring device and its control method |
| CN112910291A (en) * | 2019-11-19 | 2021-06-04 | 北京金风科创风电设备有限公司 | Converter control method, controller and control equipment and converter system |
| CN112910291B (en) * | 2019-11-19 | 2023-05-09 | 北京金风科创风电设备有限公司 | Control method, controller and control equipment of converter and converter system |
| CN110957759A (en) * | 2019-11-20 | 2020-04-03 | 合肥工业大学 | Control method of cascade impedance adapter for stabilizing grid-connected inverter system |
| CN110957759B (en) * | 2019-11-20 | 2022-08-05 | 合肥工业大学 | Control method of cascade impedance adapter for stabilizing grid-connected inverter system |
| CN111025023A (en) * | 2019-12-19 | 2020-04-17 | 西南交通大学 | Disturbance energy limit value selection method for injection type harmonic impedance measurement |
| CN111025023B (en) * | 2019-12-19 | 2021-03-23 | 西南交通大学 | Disturbance energy limit value selection method for injection type harmonic impedance measurement |
| CN111999563A (en) * | 2020-09-01 | 2020-11-27 | 浙江大学 | Multi-cascade direct current converter impedance online measurement method |
| CN112763928A (en) * | 2021-01-27 | 2021-05-07 | 西安新艾电气技术有限公司 | Online detection system and detection method for impedance spectrum of series-parallel battery system |
| CN112763928B (en) * | 2021-01-27 | 2024-03-29 | 西安新艾电气技术有限公司 | Online detection system and detection method for impedance spectrum of series-parallel battery system |
| CN113063987A (en) * | 2021-03-26 | 2021-07-02 | 湖南大学 | Broadband frequency coupling admittance on-line measurement method and system of power electronic equipment |
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