CN106451522B - A kind of high voltage direct current circuit harmonic impedance parses equivalent model and frequency analysis method - Google Patents
A kind of high voltage direct current circuit harmonic impedance parses equivalent model and frequency analysis method Download PDFInfo
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- CN106451522B CN106451522B CN201610994784.3A CN201610994784A CN106451522B CN 106451522 B CN106451522 B CN 106451522B CN 201610994784 A CN201610994784 A CN 201610994784A CN 106451522 B CN106451522 B CN 106451522B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The embodiment of the invention discloses a kind of high voltage direct current circuit harmonic impedance parsing equivalent model and frequency analysis methods, access for solving harmonic current in classical inverter model is limited between converter power transformer and valve bridge, the stray capacitance over the ground such as converter transformer bushings is had ignored, larger problem is differed with measured result based on DC side harmonics electric current Theoretical Design result using the model.It includes: inverter that high voltage direct current circuit provided in an embodiment of the present invention harmonic impedance, which parses equivalent model, the inverter uses three pulse conversion devices models, including leakage current paths, converter bridge, the influence of commutation inductance on leakage current paths and converter bridge is considered to reflect 3n subharmonic property, model is more accurate.In addition, the embodiment of the present invention also contemplates influence of the factor of AC system and alternating current filter to high voltage direct current loop resonance characteristic, so that high voltage direct current loop resonance specificity analysis process is more accurate tight, it is as a result relatively reliable.
Description
Technical field
The present invention relates to equivalent model emulation fields more particularly to a kind of high voltage direct current circuit harmonic impedance to parse equivalent mould
Type and frequency analysis method.
Background technique
D.C. high voltage transmission has played important function in China " transferring electricity from the west to the east, north and south supply mutually, national network " strategy.?
In DC transmission system, connects after the DC filter of DC side is in parallel with DC line with smoothing reactor, led in converter valve
It connects again with the converter power transformer, alternating current filter, AC system for exchanging side under logical state.There are multiple by each in major loop
The natural resonance frequency that a device parameter, the mode of connection are determined may result in DC loop in fundamental frequency and secondary humorous
Resonance nearby occurs for wave frequency rate, and low impedance characteristic is presented.Converter power transformer can generate that amplitude is sizable to encourage in zero load charging
Magnetic shoves, and leads to the converter power transformer being currently running generation and echo surge current, generates fundamental wave and second harmonic voltage in DC side,
DC side can flow through biggish fundamental wave and second harmonic current under low impedance characteristic, may cause protection misoperation and to straight
Flow device damages.Therefore the harmonic impedance characteristic in research high voltage direct current circuit has important theory significance and real price
Value.
Due to the non-linear behavior of DC transmission system inverter element, prevent the resonance characteristic of DC loop is from often
The method of the frequency scanning of rule is calculated.Classical inverter model is an interior inductor models, harmonic current in the model
Access be limited between converter power transformer and valve bridge, have ignored the stray capacitance over the ground such as converter transformer bushings, utilize the mould
Type differs larger phenomenon with measured result based on DC side harmonics electric current Theoretical Design result.Meanwhile in process resonance research
The less influence for considering AC system and alternating current filter to DC loop resonance characteristic, so that inverter model is in harmonic analysis
Accuracy is insufficient in.
Therefore, the access of harmonic current is limited between converter power transformer and valve bridge in classical inverter model, is ignored
The stray capacitance over the ground such as converter transformer bushings, is based on DC side harmonics electric current Theoretical Design result and actual measurement using the model
As a result differing larger is those skilled in the art's technical issues that need to address.
Summary of the invention
The embodiment of the invention provides a kind of high voltage direct current circuit harmonic impedances to parse equivalent model and frequency analysis method,
Access for solving harmonic current in classical inverter model is limited between converter power transformer and valve bridge, has ignored the change of current
The stray capacitance over the ground such as bushing shell for transformer is based on DC side harmonics electric current Theoretical Design result and measured result phase using the model
The larger problem of difference.
The embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance parsing equivalent model, comprising: inverter；
The change of current implement body uses three pulse conversion devices models；
The three pulse conversion devices model includes leakage current paths, converter bridge；
Commutation inductance calculation formula on the converter bridge of the three pulse conversion devices model is as follows:
Wherein: LCIt is the leakage inductance of converter power transformer, L3PIt is the inverter commutation inductance considered after commutation process, μ is pair
Answer the angle overlap under most serious operating condition.
Preferably, the calculation formula of the angle overlap under the corresponding most serious operating condition is as follows:
In formula, β is the triggering angle of advance of inverter, IdFor DC current；XrFor commutating reactance；UvFor converter power transformer friendship
The voltage conversion of side is flowed to the voltage of valve side.
It preferably, further include AC system, the AC system is specially an induction reactance LAC, access the converter bridge；
The induction reactance LACThe voltage at both ends is ULAC, the induction reactance LACElectric current be ILAC, n is that every 6 pulsation of station of DC side is changed
Flow device quantity, converter power transformer ac-side current are as follows: I=ILAC/ n, AC system impedance conversion to converter power transformer DC side
Are as follows:
LV=[1.5 μ+(60- μ) × 2]/60LDC
Wherein: r is the no-load voltage ratio of converter power transformer, LDCFor AC system conversion to converter power transformer DC side impedance, LVFor
Calculated value of the AC system conversion to converter power transformer DC side impedance after consideration commutation process.
It preferably, further include alternating current filter, the alternating current filter is specially the series-parallel circuit RLC, parallel connection access institute
State converter bridge；
Side identical with AC system parsing Equivalent Calculation can be used in the inductance and resistance in the series-parallel circuit RLC
Method is converted；
The capacitor in the series-parallel circuit RLC, can be used following formula and is converted:
Wherein: CACFFor the capacitance of alternating current filter, CDCFor the calculated value of alternating current filter capacitor equivalent to DC side.
Preferably, further include smoothing reactor, DC filter, access the DC terminal of the three pulse conversion devices model；
The smoothing reactor, the DC filter directly quote master mould parameter, and do not change its series-parallel knot
Structure.
Preferably, further include DC line and earthing pole lead, connect the DC terminal of the three pulse conversion devices model；
The DC line, the earthing pole lead use frequency-domain model.
The embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method, based on such as above-mentioned
A kind of harmonic impedance parsing equivalent model in high voltage direct current circuit is tested, comprising:
Pass through the equivalent change of current for parsing inverter and calculating inverter of the three pulse conversion devices models with leakage current paths
Commutation inductance on bridge；
Pass through induction reactance L varying with frequencyACEquivalent parsing AC system passes through the equivalent parsing exchange in the series-parallel circuit RLC
Filter, and by induction reactance LACAbove-mentioned three pulse conversion devices model is accessed with the series-parallel circuit RLC, is obtained comprising converter valve, exchange
System and three pulse conversion devices of alternating current filter parse equivalent model；
Three pulse conversion devices parsing equivalent model access high voltage direct current circuit harmonic impedance is parsed into equivalent model.
Preferably, this method further include:
It is inserted into test voltage source in resulting high voltage direct current circuit harmonic impedance parsing equivalent model smoothing reactor valve side,
Measurement records the test voltage source both end voltage signal and flows through the current signal of voltage source；
To resulting voltage, current signal carry out Fourier analysis, obtain voltage, electric current amplitude-frequency characteristic, by the voltage,
Electric current amplitude-frequency characteristic is divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic.
The embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance frequency-response analysis device, based on such as above-mentioned
A kind of high voltage direct current circuit harmonic impedance frequency-response analysis method is analyzed, comprising:
The equivalent parsing module of inverter, for being changed by the equivalent parsing of the three pulse conversion devices models with leakage current paths
Stream device simultaneously calculates the commutation inductance on the converter bridge of inverter；
AC system and the equivalent parsing module of alternating current filter, for passing through induction reactance L varying with frequencyACEquivalent parsing is handed over
Streaming system, by the equivalent parsing alternating current filter in the series-parallel circuit RLC, and by induction reactance LACIt is above-mentioned with the series-parallel circuit access of RLC
Three pulse conversion devices models obtain three pulse conversion devices comprising converter valve, AC system and alternating current filter and parse equivalent mould
Type；
AM access module, for three pulse conversion devices parsing equivalent model to be accessed high voltage direct current circuit harmonic impedance solution
Analyse equivalent model.
Preferably, further includes:
It is inserted into test module, for parsing equivalent model in the resulting high voltage direct current circuit harmonic impedance of model construction module
Test voltage source is inserted into smoothing reactor valve side, and measurement records the test voltage source both end voltage signal and flows through voltage source
Current signal；
It is special to obtain voltage, electric current amplitude-frequency for carrying out Fourier analysis to resulting voltage, current signal for computing module
Property, the voltage, electric current amplitude-frequency characteristic are divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
It includes: inverter that high voltage direct current circuit provided in an embodiment of the present invention harmonic impedance, which parses equivalent model, described to change
It flows device and uses three pulse conversion devices models, including leakage current paths, converter bridge, it is contemplated that commutation on leakage current paths and converter bridge
To reflect 3n subharmonic property, model is more accurate for the influence of inductance, solves harmonic current in classical inverter model
Access is limited between converter power transformer and valve bridge, is had ignored the stray capacitance over the ground such as converter transformer bushings, is utilized the model
Larger problem is differed with measured result based on DC side harmonics electric current Theoretical Design result.In addition, the embodiment of the present invention considers
The influence of AC system and the factor of alternating current filter to high voltage direct current loop resonance characteristic, so that high voltage direct current loop resonance
Specificity analysis process is more accurate tight, as a result relatively reliable.The embodiment of the present invention resistance frequency specificity analysis in collection voltages and
Current signal carries out Fourier analysis, and method is simple, convenient, more efficient.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the schematic diagram that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model；
Fig. 2 is one of a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method provided in an embodiment of the present invention
The schematic diagram of embodiment；
Fig. 3 is the implementation that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
The schematic diagram of example；
Fig. 4 is another reality that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
Apply the schematic diagram of three pulse conversion devices models in example；
Fig. 5 is another reality that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
Apply the schematic diagram of the three pulse conversion devices models comprising AC system and alternating current filter in example；
Fig. 6 is another reality that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
Apply the test voltage source time domain waveform schematic diagram in example；
Fig. 7 is another reality that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
Apply the electric current time domain waveform schematic diagram for flowing through test voltage source in example；
Fig. 8 is another reality that a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parses equivalent model
Apply the voltage after Fourier analysis, electric current, the impedance amplitude-versus-frequency curve schematic diagram in example.
Wherein, appended drawing reference is as follows:
201, the equivalent parsing module of inverter；202, AC system and the equivalent parsing module of alternating current filter；203, it accesses
Module；204, it is inserted into test module；205, computing module.
Specific embodiment
The embodiment of the invention provides a kind of high voltage direct current circuit harmonic impedances to parse equivalent model and frequency analysis method,
Access for solving harmonic current in classical inverter model is limited between converter power transformer and valve bridge, has ignored the change of current
The stray capacitance over the ground such as bushing shell for transformer is based on DC side harmonics electric current Theoretical Design result and measured result phase using the model
The larger problem of difference.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, the embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance parsing equivalent model, comprising:
Inverter；
Change of current implement body uses three pulse conversion devices models；
Three pulse conversion devices models include leakage current paths, converter bridge；
Commutation inductance calculation formula on the converter bridge of three pulse conversion devices models is as follows:
Wherein: LCIt is the leakage inductance of converter power transformer, L3PIt is the inverter commutation inductance considered after commutation process, μ is pair
Answer the angle overlap under most serious operating condition.
The calculation formula of angle overlap under corresponding most serious operating condition is as follows:
In formula, β is the triggering angle of advance of inverter, IdFor DC current；XrFor commutating reactance；UvFor converter power transformer friendship
The voltage conversion of side is flowed to the voltage of valve side.
A kind of high voltage direct current circuit harmonic impedance parsing equivalent model provided in an embodiment of the present invention further includes AC system,
AC system is specially an induction reactance LAC, access the converter bridge；
Induction reactance LACThe voltage at both ends is ULAC, induction reactance LACElectric current be ILAC, n is 6 pulse conversion devices numbers of the every station of DC side
Amount, converter power transformer ac-side current are as follows: I=ILAC/ n, AC system impedance conversion to converter power transformer DC side are as follows:
LV=[1.5 μ+(60- μ) × 2]/60LDC
Wherein: r is the no-load voltage ratio of converter power transformer, LDCFor AC system conversion to converter power transformer DC side impedance, LVFor
Calculated value of the AC system conversion to converter power transformer DC side impedance after consideration commutation process.
A kind of high voltage direct current circuit harmonic impedance parsing equivalent model provided in an embodiment of the present invention further includes ac filter
Device, alternating current filter are specially the series-parallel circuit RLC, and parallel connection accesses the converter bridge；
The inductance and resistance in the series-parallel circuit RLC can be used method identical with AC system parsing Equivalent Calculation and rolled over
It calculates；
The capacitor in the series-parallel circuit RLC can be used following formula and be converted
Wherein: CACFFor the capacitance of alternating current filter, CDCFor the calculated value of alternating current filter capacitor equivalent to DC side.
Alternating current filter be resistance, inductance, capacitor series-parallel circuit, in terms of DC side, by AC system and exchange filter
Both wave devices are equivalent to shunt circuit and introduce the three pulse converter model of inverter.
A kind of high voltage direct current circuit harmonic impedance parsing equivalent model provided in an embodiment of the present invention further includes flat wave reactance
Device, DC filter access the DC terminal of the three pulse conversion devices model；
Smoothing reactor, DC filter directly quote master mould parameter, and do not change its series and parallel structure.
It should be noted that the embodiment of the present invention is the equal of that an actual model is carried out equivalent, original model
Part just refer to do not need it is equivalent, master mould directly take back can, general smoothing reactor is exactly an electric pole, directly
Flowing filter is one group of series-parallel RLC, i.e., master mould refers to equivalent preceding model.
A kind of high voltage direct current circuit harmonic impedance parsing equivalent model provided in an embodiment of the present invention further includes DC line
With earthing pole lead, the DC terminal of the three pulse conversion devices model is connected；
DC line, earthing pole lead use frequency-domain model.
It should be noted that frequency-domain model is also the frequency-domain model in master mould.
It is one to a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention parsing equivalent model above
Embodiment is explained in detail, below will be to a kind of high voltage direct current circuit harmonic impedance frequency characteristic provided in an embodiment of the present invention
One embodiment of analysis method is explained in detail.
Referring to Fig. 2, the embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method, base
It is tested in a kind of such as above-mentioned high voltage direct current circuit harmonic impedance parsing equivalent model, comprising:
101, by having the equivalent parsing inverter of three pulse conversion devices models of leakage current paths and calculating inverter
Commutation inductance on converter bridge；
102, pass through induction reactance L varying with frequencyACEquivalent parsing AC system passes through the equivalent parsing in the series-parallel circuit RLC
Alternating current filter, and by induction reactance LACAccess above-mentioned three pulse conversion devices model with the series-parallel circuit RLC, obtain comprising converter valve,
AC system and three pulse conversion devices of alternating current filter parse equivalent model；
103, three pulse conversion devices parsing equivalent model access high voltage direct current circuit harmonic impedance is parsed into equivalent mould
Type；
104, in resulting high voltage direct current circuit harmonic impedance parsing equivalent model smoothing reactor valve side insertion test electricity
Potential source, measurement record the test voltage source both end voltage signal and flow through the current signal of voltage source；
105, Fourier analysis is carried out to resulting voltage, current signal, obtains voltage, electric current amplitude-frequency characteristic, it will be described
Voltage, electric current amplitude-frequency characteristic are divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic.
It is to a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method provided in an embodiment of the present invention above
One embodiment is explained in detail, below will be to a kind of high voltage direct current circuit harmonic impedance frequency provided in an embodiment of the present invention
One embodiment of specificity analysis device is explained in detail.
The embodiment of the present invention provides a kind of high voltage direct current circuit harmonic impedance frequency-response analysis device, based on such as above-mentioned
A kind of high voltage direct current circuit harmonic impedance frequency-response analysis method is analyzed, comprising:
The equivalent parsing module 201 of inverter, for the three pulse conversion devices model equivalent solutions by having leakage current paths
Analysis inverter simultaneously calculates the commutation inductance on the converter bridge of inverter；
AC system and the equivalent parsing module 202 of alternating current filter, for passing through induction reactance L varying with frequencyACEquivalent solution
Analyse AC system, by the equivalent parsing alternating current filter in the series-parallel circuit RLC, and by induction reactance LACWith the series-parallel circuit access of RLC
Above-mentioned three pulse conversion devices model obtains the three pulse conversion devices parsing etc. comprising converter valve, AC system and alternating current filter
Imitate model；
AM access module 203, for hindering three pulse conversion devices parsing equivalent model access high voltage direct current circuit harmonic wave
Anti- parsing equivalent model.
Further include:
It is inserted into test module 204, for equivalent in the resulting high voltage direct current circuit harmonic impedance parsing of model construction module
Test voltage source is inserted into model smoothing reactor valve side, and measurement records the test voltage source both end voltage signal and flows through voltage
The current signal in source；
Computing module 205 obtains voltage, electric current amplitude-frequency for carrying out Fourier analysis to resulting voltage, current signal
The voltage, electric current amplitude-frequency characteristic are divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic by characteristic.
It is to a kind of high voltage direct current circuit harmonic impedance frequency-response analysis device provided in an embodiment of the present invention above
One embodiment is explained in detail, and will be parsed below to a kind of high voltage direct current circuit harmonic impedance provided in an embodiment of the present invention
Another of equivalent model and frequency analysis method embodiment are explained in detail.
Referring to Fig. 1, equivalent model figure is parsed for high voltage direct current circuit of the present invention harmonic impedance.
Parse to each important component of D.C. high voltage transmission loop simulation model equivalent, the equivalent mould of foundation parsing
Type；The component part mainly includes AC system, alternating current filter, inverter, converter power transformer, smoothing reactor, direct current
Filter, DC line and earthing pole lead etc..Wherein, inverter uses three pulse converter model；Alternating current filter is resistance, electricity
Feel, both AC system and alternating current filter are equivalent to shunt circuit and introduced by the series-parallel circuit of capacitor in terms of DC side
The three pulse converter model of inverter；Smoothing reactor, DC filter directly quote component parameters；DC line and earthing pole lead
Using frequency-domain model.Impedance frequency scanning is carried out to the model built, obtains its impedance frequency characteristic.
It is illustrated by taking rectification side relevant parameter as an example in the present embodiment, inverter model uses three pulse converter model, such as
Shown in Fig. 4.The inverter three pulse converter model calculation formula is as follows:
Wherein: LCIt is the leakage inductance of converter power transformer；L3PIt is the inverter commutation inductance considered after commutation process, μ is pair
The angle overlap under most serious operating condition is answered, calculation formula is as follows:
In formula, β is the triggering angle of advance of inverter, IdFor DC current；XrFor commutating reactance；UvFor converter power transformer friendship
The voltage conversion of side is flowed to the voltage of valve side.
Stray capacitance takes 15 μ F of empirical value in the three pulse conversion devices model.
In the present embodiment, AC system parsing is equivalent to an induction reactance LAC, both end voltage ULAC, electric current ILAC, by
It is connected to multiple 6 pulse conversion devices, therefore converter power transformer ac-side current simultaneously in same ac bus are as follows: I=ILAC/n。
Wherein n is 6 pulse conversion devices quantity of the every station of DC side；AC system impedance is converted to converter power transformer DC side are as follows:
LV=[1.5 μ+(60- μ) × 2]/60LDC
Wherein: r is the no-load voltage ratio of converter power transformer, LDCFor AC system conversion to converter power transformer DC side impedance, LVFor
Calculated value of the AC system conversion to converter power transformer DC side impedance after consideration commutation process
In the present embodiment, the alternating current filter parsing equivalent model calculates as follows:
For alternating current filter, inductance and resistance can be used method identical with AC system parsing Equivalent Calculation into
Row conversion；For capacitor, following formula can be used and converted
Wherein: CACFFor the capacitance of alternating current filter, CDCFor the calculated value of alternating current filter capacitor equivalent to DC side.
AC system and alternating current filter look over the shunt circuit for being equivalent to the two from DC side, pass through change of current no-load voltage ratio
Converter valve side is converted, and is introduced into the inverter three pulse converter model, obtain comprising converter valve, AC system and exchanges filter
Three pulse conversion devices of wave device parse equivalent model, as shown in Fig. 5.
In the present embodiment, the smoothing reactor and DC filter parameter directly take master mould parameter value, direct current
Route and earthing pole lead use master mould frequency-domain model
In the present embodiment, it establishes after high voltage direct current circuit harmonic impedance parsing equivalent model, the model is carried out
Impedance frequency scanning, obtains high voltage direct current circuit harmonic impedance frequency characteristic, step includes:
(1) high voltage direct current circuit harmonic impedance parsing equivalent model is established in PSCAD/EMTDC platform
(2) test voltage source u is inserted into parsing equivalent model smoothing reactor valve sideA, amplitude 0.5KVFrequency is
Frequency range 0-150Hz (each voltage to frequency source can be inserted separately into or be inserted into simultaneously) of concern measures described in record
Test voltage source both end voltage signal and the current signal i for flowing through voltage sourceA, as shown in Figure 6, Figure 7
(3) Fourier analysis is carried out to resulting voltage, current signal, obtains voltage, electric current amplitude-frequency characteristic UA(f)、IA
(f), the two is divided by obtain the high voltage direct current circuit harmonic impedance frequency characteristic ZA(f), as shown in Figure 8
One embodiment of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of high voltage direct current circuit harmonic impedance parses equivalent model characterized by comprising inverter；
The change of current implement body uses three pulse conversion devices models；
The three pulse conversion devices model includes leakage current paths, converter bridge；
Commutation inductance calculation formula on the converter bridge of the three pulse conversion devices model is as follows:
Wherein: LCIt is the leakage inductance of converter power transformer, L3PIt is the inverter commutation inductance considered after commutation process, μ is to correspond to most
Angle overlap under serious operating condition；
The calculation formula of angle overlap under the corresponding most serious operating condition is as follows:
In formula, β is the triggering angle of advance of inverter, IdFor DC current；XrFor commutating reactance；UvSide is exchanged for converter power transformer
Voltage conversion to valve side voltage.
2. a kind of high voltage direct current circuit harmonic impedance according to claim 1 parses equivalent model, which is characterized in that also wrap
AC system is included, the AC system is specially an induction reactance LAC, access the converter bridge；
The induction reactance LACThe voltage at both ends is ULAC, the induction reactance LACElectric current be ILAC, n is 6 pulse conversion devices of the every station of DC side
Quantity, converter power transformer ac-side current are as follows: I=ILAC/ n, AC system impedance conversion to converter power transformer DC side are as follows:
LV=[1.5 μ+(60- μ) × 2]/60LDC
Wherein: r is the no-load voltage ratio of converter power transformer, LDCFor AC system conversion to converter power transformer DC side impedance, LVTo consider
Calculated value of the AC system conversion to converter power transformer DC side impedance after commutation process.
3. a kind of high voltage direct current circuit harmonic impedance according to claim 2 parses equivalent model, which is characterized in that also wrap
Alternating current filter is included, the alternating current filter is specially the series-parallel circuit RLC, and parallel connection accesses the converter bridge；
The inductance and resistance in the series-parallel circuit RLC can be used with the AC system identical method of parsing Equivalent Calculation into
Row conversion；
The capacitor in the series-parallel circuit RLC, can be used following formula and is converted:
Wherein: CACFFor the capacitance of alternating current filter, CDCFor the calculated value of alternating current filter capacitor equivalent to DC side.
4. a kind of high voltage direct current circuit harmonic impedance according to claim 1 parses equivalent model, which is characterized in that also wrap
Smoothing reactor, DC filter are included, the DC terminal of the three pulse conversion devices model is accessed；
The smoothing reactor, the DC filter directly quote master mould parameter, and do not change its series and parallel structure.
5. a kind of high voltage direct current circuit harmonic impedance according to claim 1 parses equivalent model, which is characterized in that also wrap
DC line and earthing pole lead are included, the DC terminal of the three pulse conversion devices model is connected；
The DC line, the earthing pole lead use frequency-domain model.
6. a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method, based on such as any one of claim 1 to 5 institute
A kind of high voltage direct current circuit harmonic impedance parsing equivalent model stated is tested characterized by comprising
By on the equivalent converter bridge for parsing inverter and calculating inverter of the three pulse conversion devices models with leakage current paths
Commutation inductance；
Pass through induction reactance L varying with frequencyACEquivalent parsing AC system passes through the equivalent parsing ac filter in the series-parallel circuit RLC
Device, and by induction reactance LACAbove-mentioned three pulse conversion devices model is accessed with the series-parallel circuit RLC, is obtained comprising converter valve, AC system
Equivalent model is parsed with three pulse conversion devices of alternating current filter；
Three pulse conversion devices parsing equivalent model access high voltage direct current circuit harmonic impedance is parsed into equivalent model.
7. a kind of high voltage direct current circuit harmonic impedance frequency-response analysis method according to claim 6, which is characterized in that
Further include:
Test voltage source, measurement are inserted into resulting high voltage direct current circuit harmonic impedance parsing equivalent model smoothing reactor valve side
It records the test voltage source both end voltage signal and flows through the current signal of voltage source；
Fourier analysis is carried out to resulting voltage, current signal, voltage, electric current amplitude-frequency characteristic are obtained, by the voltage, electric current
Amplitude-frequency characteristic is divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic.
8. a kind of high voltage direct current circuit harmonic impedance frequency-response analysis device, based on such as any one of claim 6 or 7 institute
A kind of high voltage direct current circuit harmonic impedance frequency-response analysis method stated is analyzed characterized by comprising
The equivalent parsing module of inverter, for the equivalent parsing inverter of three pulse conversion devices models by having leakage current paths
And calculate the commutation inductance on the converter bridge of inverter；
AC system and the equivalent parsing module of alternating current filter, for passing through induction reactance L varying with frequencyACEquivalent parsing exchange system
System, by the equivalent parsing alternating current filter in the series-parallel circuit RLC, and by induction reactance LACAbove-mentioned three arteries and veins is accessed with the series-parallel circuit RLC
Dynamic inverter model obtains the three pulse conversion devices parsing equivalent model comprising converter valve, AC system and alternating current filter；
AM access module, for three pulse conversion devices parsing equivalent model to be accessed high voltage direct current circuit harmonic impedance parsing etc.
Imitate model.
9. a kind of high voltage direct current circuit harmonic impedance frequency-response analysis device according to claim 8, which is characterized in that
Further include:
It is inserted into test module, for parsing the flat wave of equivalent model in the resulting high voltage direct current circuit harmonic impedance of model construction module
Test voltage source is inserted into reactor valve side, and measurement records the test voltage source both end voltage signal and flows through the electric current of voltage source
Signal；
Computing module will for obtaining voltage, electric current amplitude-frequency characteristic to resulting voltage, current signal progress Fourier analysis
The voltage, electric current amplitude-frequency characteristic are divided by obtain high voltage direct current circuit harmonic impedance frequency characteristic.
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| CN107425536A (en) * | 2017-09-26 | 2017-12-01 | 广东电网有限责任公司电力科学研究院 | DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method |
| CN108667006B (en) * | 2018-04-13 | 2021-02-19 | 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 | Single-valve digital broadband fault risk analysis method for improving reliability of converter valve |
| CN109038534A (en) * | 2018-07-17 | 2018-12-18 | 中国南方电网有限责任公司 | A kind of novel DC transmission system harmonic impedance scanning means |
| CN109239484A (en) * | 2018-07-28 | 2019-01-18 | 中国南方电网有限责任公司 | A kind of converter power transformer equivalent model test method |
| CN109494705B (en) * | 2018-12-29 | 2021-12-28 | 国家电网有限公司 | Selection method and system of direct current filter for suppressing direct current side harmonic voltage |
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