CN107425536A - DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method - Google Patents

DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method Download PDF

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Publication number
CN107425536A
CN107425536A CN201710884751.8A CN201710884751A CN107425536A CN 107425536 A CN107425536 A CN 107425536A CN 201710884751 A CN201710884751 A CN 201710884751A CN 107425536 A CN107425536 A CN 107425536A
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China
Prior art keywords
impedance
arrival end
transverter
equivalent
line
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Inventor
余超耘
杨汾艳
盛超
刘正富
朱良合
骆潘钿
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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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
    • 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
    • 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]
    • 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]

Abstract

The invention provides a kind of DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method, wherein equivalent model includes transverter, AC system impedance and alternating current filter；Transverter is equivalent to two commutation inductance L by connecting3pThe transverter model of composition；AC system equivalent impedance is emotional resistance Zac；Alternating current filter is equivalent to RLC connection in series-parallel capacitive reactances Zacf；RLC connection in series-parallel capacitive reactances ZacfWith emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween；Commutation inductance L3pFirst it is non-series connection end be connected with DC line；Commutation inductance L3pSecond it is non-series connection end be connected with earthing pole lead.The transverter model that the present invention is solved in the harmonic impedance parsing equivalent model of HVDC loop contains converter transformer sleeve stray capacitance, add the complexity of circuit, make it difficult to derive the analytical expression of corresponding equivalent impedance, the caused technical problem that DC line arrival end harmonic impedance can not be derived by calculating.

Description

DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method
Technical field
The present invention relates to direct current transportation field, more particularly to a kind of DC line arrival end harmonic impedance equivalent model, meter Calculation and frequency analysis method.
Background technology
Advantage of the high voltage dc transmission technology with its technology and economically, is at home and abroad widely used.With A plurality of HVDC transmission line building up and putting into operation, and China's power network has formed the general layout of extensive alternating current-direct current series-parallel connection.Exchange system Alternating voltage distortion caused by system disturbance will produce uncharacteristic harmonics in DC side, and the stable of AC-DC hybrid power grid may be transported Row impacts.
In recent years, domestic power network repeatedly occurs by unloaded pair for putting into adjacent power plant transformer or converter power transformer and triggering Side direct current 50Hz protection acts, most cause direct current downrating at last.When this is due to power transformer zero load input power network Caused excitation surge current contains the order harmonic components of positive sequence 2, and the component is by the conversion of transverter and the amplification of DC line Afterwards, substantial amounts of 50Hz components will be produced in DC line end.The distribution of 50Hz harmonic components and circuit end along DC line Equivalent harmonic wave impedance into the top-cross streaming system is seen at end, namely DC line arrival end harmonic impedance is relevant.
It is equivalent that a kind of harmonic impedance parsing of HVDC loop is proposed in Publication No. 106451522A Chinese patent Transverter model in model and frequency analysis method, wherein HVDC loop harmonic impedance parsing equivalent model, which contains, to be changed Rheology sleeve pipe stray capacitance, add the complexity of circuit, making it difficult to the analytical expression of corresponding equivalent impedance is derived, Result in can not derive the technical problem of DC line arrival end harmonic impedance by calculating.
The content of the invention
The invention provides a kind of DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method, solution The transverter model that HVDC loop harmonic impedance is parsed in equivalent model of having determined contains converter transformer sleeve stray capacitance, increases Add the complexity of circuit, making it difficult to the analytical expression of corresponding equivalent impedance is derived, it is caused to pass through calculating Derive the technical problem of DC line arrival end harmonic impedance.
The invention provides a kind of DC line arrival end harmonic impedance equivalent model, including：Transverter, AC system resistance Anti- and alternating current filter；
The transverter is equivalent to two commutation inductance L by connecting3pThe transverter model of composition；
The AC system equivalent impedance is emotional resistance Zac；
The alternating current filter is equivalent to RLC connection in series-parallel capacitive reactances Zacf；
The RLC connection in series-parallel capacitive reactances ZacfWith the emotional resistance ZacAfter parallel connection, two commutation inductances are connected on L3pBetween；
The commutation inductance L3pFirst it is non-series connection end be connected with DC line；
The commutation inductance L3pSecond it is non-series connection end be connected with earthing pole lead.
Preferably, a kind of DC line arrival end harmonic impedance equivalent model provided by the invention also includes：Flat ripple reactance Device；
The first end of the smoothing reactor is connected with the DC line；
Second end of the smoothing reactor and the commutation inductance L3pFirst it is non-series connection end connection.
Preferably, a kind of DC line arrival end harmonic impedance equivalent model provided by the invention also includes：DC filtering Device；
The DC filter is connected in parallel on the first end of the smoothing reactor and the commutation inductance L3pThe second non-string Between connection end.
A kind of DC line arrival end harmonic impedance computational methods provided by the invention, including：
S1, the leakage inductance L for obtaining converter power transformerC, the emotional resistance Z of AC system equivalent impedanceac, AC system and institute The first no-load voltage ratio k of the converter power transformer between transverter is stated, is connected to the quantity of the transverter of same ac bus N, the equivalent RLC connection in series-parallel capacitive reactances Z of alternating current filteracf；
The commutation inductance L in S2, the calculating transverter model3p, wherein,
S3, calculate the emotional resistance ZacConvert the emotional resistance Z of the valve side of the converter power transformerdc, wherein,
S4, calculate the capacitive reactances ZacfConvert the capacitive reactances Z of the valve side of the converter power transformeracf_dc, wherein,
S5, calculate the transverter equivalent model comprising the transverter, the AC system and the alternating current filter Equivalent impedance Zc, wherein,
S6, obtain smoothing reactor impedance Zs, DC filter impedance Zdcf, earthing pole lead impedance Zj, according to preset fortune Line mode calculates the DC line arrival end harmonic impedance Z.
Preferably, when the preset method of operation is bipolar symmetrical operation mode, the DC line arrival end harmonic wave resistance It is anti-
Preferably, when the preset method of operation is the monopolar metallic return method of operation, the DC line arrival end is humorous Wave impedance
Preferably, when the preset method of operation is the monopolar ground return method of operation, the DC line arrival end is humorous Wave impedance
A kind of HVDC transmission line arrival end harmonic impedance analysis method provided by the invention includes：
Pass through two commutation inductance L by connecting3pThe equivalent transverter of transverter model of composition, and calculate the transverter The commutation inductance L in model3p；
Pass through emotional resistance ZacEquivalent AC system, RLC connection in series-parallel capacitive reactances ZacfEquivalent AC wave filter, and by institute State RLC connection in series-parallel capacitive reactances ZacfWith the emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween, obtain To the transverter equivalent model comprising the transverter, the AC system and the alternating current filter；
The transverter equivalent model comprising the transverter, the AC system and the alternating current filter is accessed In DC line arrival end harmonic impedance equivalent model.
Preferably, a kind of HVDC transmission line arrival end harmonic impedance analysis provided by the invention also includes：
In the smoothing reactor line side of the DC line arrival end harmonic impedance equivalent model, insertion amplitude is specified The direct voltage source of value；
Test voltage source is inserted in the smoothing reactor line side of the DC line arrival end harmonic impedance equivalent model, Record the voltage source both end voltage signal and flow through the current signal of the voltage source；
Fourier decomposition is carried out to the voltage signal and the current signal, obtains harmonic voltage amplitude versus frequency characte and harmonic wave Electric current amplitude versus frequency characte, the harmonic voltage amplitude versus frequency characte and the harmonic current amplitude versus frequency characte are divided by obtain DC line entrance Hold harmonic impedance amplitude versus frequency characte.
Preferably, a kind of HVDC transmission line arrival end harmonic impedance analysis provided by the invention also includes：
Fourier decomposition is carried out to the voltage signal and the current signal, obtains harmonic voltage phase-frequency characteristic and harmonic wave Electric current phase-frequency characteristic, the harmonic voltage phase-frequency characteristic and the harmonic current phase-frequency characteristic are subtracted each other to obtain DC line entrance Hold harmonic impedance phase-frequency characteristic.
From above technical scheme, the present invention has advantages below：
The invention provides a kind of DC line arrival end harmonic impedance equivalent model, including：Transverter, AC system resistance Anti- and alternating current filter；The transverter is equivalent to two commutation inductance L by connecting3pThe transverter model of composition；The friendship Streaming system equivalent impedance is emotional resistance Zac；The alternating current filter is equivalent to RLC connection in series-parallel capacitive reactances Zacf；The RLC strings Capacitive reactances Z in parallelacfWith the emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween；The commutation Inductance L3pFirst it is non-series connection end be connected with DC line；The commutation inductance L3pThe second non-series connection end and earthing pole lead Connection.
In the DC line arrival end harmonic impedance equivalent model of the present invention, due to the value of converter transformer sleeve stray capacitance Very little, its impedance value is much larger than other elements in equivalent model in very big frequency range, and its branch road is considered as into open circuit, because This simplifies DC line arrival end harmonic impedance equivalent model, enabling directly derives that DC line enters by analytic expression Mouth end harmonic impedance, the transverter model solved in the harmonic impedance parsing equivalent model of HVDC loop contain change of current change Sleeve pipe stray capacitance, add the complexity of circuit, making it difficult to derive the analytical expression of corresponding equivalent impedance, cause Can not derive the technical problem of DC line arrival end harmonic impedance by calculating.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the embodiments of the invention provide a kind of schematic diagram of DC line arrival end harmonic impedance equivalent model；
Fig. 2 is a kind of schematic flow sheet of DC line arrival end harmonic impedance computational methods provided by the invention；
Fig. 3 is a kind of schematic flow sheet of DC line arrival end harmonic impedance frequency analysis method provided by the invention；
Fig. 4 is the equivalent model schematic diagram used in DC line arrival end harmonic impedance frequency analysis in Fig. 3；
Fig. 5 is the amplitude-versus-frequency curve in the test voltage source inserted in Fig. 3；
Fig. 6 is the phase-frequency characteristic curve in the test voltage source inserted in Fig. 3；
Fig. 7 is the DC line obtained according to a kind of DC line arrival end harmonic impedance computational methods provided by the invention The amplitude-versus-frequency curve of arrival end harmonic impedance；
Fig. 8 is the DC line obtained according to a kind of DC line arrival end harmonic impedance computational methods provided by the invention The phase-frequency characteristic curve of arrival end harmonic impedance；
Fig. 9 is the direct current obtained according to a kind of DC line arrival end harmonic impedance frequency analysis method provided by the invention The amplitude-versus-frequency curve of line inlet end harmonic impedance；
Figure 10 is straight to be obtained according to a kind of DC line arrival end harmonic impedance frequency analysis method provided by the invention The phase-frequency characteristic curve of Flow Line arrival end harmonic impedance.
Embodiment
The embodiments of the invention provide a kind of DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis side Method, solves that to contain converter transformer sleeve in the transverter model in HVDC loop harmonic impedance parsing equivalent model spuious Electric capacity, add the complexity of circuit, making it difficult to derive the analytical expression of corresponding equivalent impedance, therefore currently without The related direct calculation method of DC line arrival end harmonic impedance is proposed for, it is caused to derive direct current by calculating The technical problem of line inlet end harmonic impedance.
Referring to Fig. 1, the invention provides a kind of one embodiment of DC line arrival end harmonic impedance equivalent model, Including：Transverter, AC system impedance and alternating current filter；
Transverter is equivalent to two commutation inductance L by connecting3pThe transverter model of composition；
AC system equivalent impedance is emotional resistance Zac；
Alternating current filter is equivalent to RLC connection in series-parallel capacitive reactances Zacf；
RLC connection in series-parallel capacitive reactances ZacfWith emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween；
Commutation inductance L3pFirst it is non-series connection end be connected with DC line；
Commutation inductance L3pSecond it is non-series connection end be connected with earthing pole lead.
It should be noted that in the engineering of reality, more than one is there may be per pole current conversion station and includes transverter, exchange The transverter equivalent model of system and alternating current filter, as shown in figure 1, a kind of DC line entrance provided in an embodiment of the present invention Harmonic impedance equivalent model is held by 2 transverter equivalent models series connection structures comprising transverter, AC system and alternating current filter Into when multiple transverter equivalent models comprising transverter, AC system and alternating current filter being present, including transverter, handing over It is connected in series between streaming system and the transverter equivalent model of alternating current filter, is determined to include the change of current according to the engineering demand of reality The quantity of the transverter equivalent model of device, AC system and alternating current filter, will not be described here.
Further, a kind of DC line arrival end harmonic impedance equivalent model provided by the invention also includes：Flat ripple electricity Anti- device；
The first end of smoothing reactor is connected with DC line；
Second end of smoothing reactor and commutation inductance L3pFirst it is non-series connection end connection.
Further, a kind of DC line arrival end harmonic impedance equivalent model provided by the invention also includes：Direct current is filtered Ripple device；
DC filter is connected in parallel on the first end and commutation inductance L of smoothing reactor3pSecond it is non-series connection end between.
It should be noted that the embodiment of the present invention is that the model of a reality is carried out into equivalent, smoothing reactor and direct current Wave filter is equivalent preceding model, it is not necessary to carries out other conversion, enters for transverter, AC system and alternating current filter Row equivalent part, it is directly accessed among original equivalent preceding model.
In the DC line arrival end harmonic impedance equivalent model of the embodiment of the present invention, due to converter transformer sleeve stray capacitance Value very little, in very big frequency range its impedance value be much larger than equivalent model in other elements, its branch road is considered as Open circuit, therefore simplify DC line arrival end harmonic impedance equivalent model, enabling directly derived directly by analytic expression Flow Line arrival end harmonic impedance, the transverter model solved in the harmonic impedance parsing equivalent model of HVDC loop include Converter transformer sleeve stray capacitance, add the complexity of circuit, making it difficult to derive the resolution table of corresponding equivalent impedance Up to formula, the caused technical problem that DC line arrival end harmonic impedance can not be derived by calculating.
Above is a kind of one embodiment of DC line arrival end harmonic impedance equivalent model provided by the invention is entered Row description, a kind of one embodiment of DC line arrival end harmonic impedance computational methods provided by the invention will be carried out below Description.
Referring to Fig. 2, a kind of one embodiment of DC line arrival end harmonic impedance computational methods provided by the invention, Including：
101st, the leakage inductance L of converter power transformer is obtainedC, the emotional resistance Z of AC system equivalent impedanceac, AC system with First no-load voltage ratio k of the converter power transformer between transverter, it is connected to the quantity n of the transverter of same ac bus, ac filter The equivalent RLC connection in series-parallel capacitive reactances Z of deviceacf；
It should be noted that obtain the leakage inductance L of converter power transformerC, the emotional resistance Z of AC system equivalent impedanceac, hand over First no-load voltage ratio k of the converter power transformer between streaming system and transverter, the quantity n of the transverter of same ac bus is connected to, The equivalent RLC connection in series-parallel capacitive reactances Z of alternating current filteracf, prepared for follow-up calculating.
102nd, the commutation inductance L in transverter model is calculated3p, wherein,
It should be noted that the commutation inductance L in transverter model is calculated by formula3p。
103rd, emotional resistance Z is calculatedacConvert the emotional resistance Z of the valve side of converter power transformerdc, wherein,
It should be noted that emotional resistance Z is calculated by formulaacConvert the emotional resistance of the valve side of converter power transformer
104th, capacitive reactances Z is calculatedacfConvert the capacitive reactances Z of the valve side of converter power transformeracf_dc, wherein,
It should be noted that capacitive reactances Z is calculated by formulaacfConvert the capacitive reactances of the valve side of converter power transformer
105th, the equivalent impedance Z of the transverter equivalent model comprising transverter, AC system and alternating current filter is calculatedc, Wherein,
It should be noted that the commutation inductance L in obtained transverter model3pValue, calculate comprising transverter, hand over The equivalent impedance Z of the transverter equivalent model of streaming system and alternating current filterc。
106th, smoothing reactor impedance Z is obtaineds, DC filter impedance Zdcf, earthing pole lead impedance Zj, according to preset fortune Line mode calculates DC line arrival end harmonic impedance Z.
It should be noted that DC line arrival end harmonic impedance Z calculates referenced DC line arrival end harmonic wave resistance The parameter of each element has obtained in anti-equivalent model and equivalent model, it is only necessary to is hindered according to DC line arrival end harmonic wave The preset method of operation of anti-equivalent model correspondingly calculates DC line arrival end harmonic impedance Z.
Further, when the preset method of operation is bipolar symmetrical operation mode, DC line arrival end harmonic impedance
It should be noted that when system operation mode is bipolar symmetrical operation mode, the resistance of DC line arrival end harmonic wave It is anti-
Further, when the preset method of operation is the monopolar metallic return method of operation, DC line arrival end harmonic impedance
It should be noted that when system operation mode is the monopolar metallic return method of operation, DC line arrival end is humorous Wave impedance
Further, when the preset method of operation is the monopolar ground return method of operation, DC line arrival end harmonic impedance
It should be noted that when system operation mode is the monopolar ground return method of operation, DC line arrival end is humorous Wave impedance
Fig. 7 and Fig. 8 are referred to, Fig. 7 is that a kind of DC line arrival end harmonic impedance computational methods provided by the invention obtain The amplitude-versus-frequency curve of the DC line arrival end harmonic impedance arrived, Fig. 8 are a kind of DC line arrival end provided by the invention The phase-frequency characteristic curve for the DC line arrival end harmonic impedance that harmonic impedance computational methods obtain.
Wherein, Fig. 7 and Fig. 8 abscissa is different value frequency, under different value frequencies, is carried by the present invention The amplitude and phase for the DC line arrival end harmonic impedance that the DC line arrival end harmonic impedance computational methods gone out obtain.
One embodiment of a kind of DC line arrival end harmonic impedance computational methods provided by the invention, based on AC line Road arrival end harmonic impedance equivalent model, can be directly by analytic expression by DC line arrival end harmonic impedance equivalent model The parameter of each element is tried to achieve so that DC line arrival end harmonic impedance value, which can be calculated directly, derives solve height Transverter model in pressure DC loop harmonic impedance parsing equivalent model contains converter transformer sleeve stray capacitance, adds electricity The complexity on road, making it difficult to the analytical expression of corresponding equivalent impedance is derived, it is caused to be derived by calculating The technical problem of DC line arrival end harmonic impedance.
Above is a kind of one embodiment of DC line arrival end harmonic impedance computational methods provided by the invention is entered Row description, below by a kind of one embodiment of DC line arrival end harmonic impedance frequency analysis method provided by the invention It is described.
An a kind of referring to Fig. 3, reality of DC line arrival end harmonic impedance frequency analysis method provided by the invention Applying example includes：
201st, two commutation inductance L by connecting are passed through3pThe equivalent transverter of transverter model of composition, and changed described in calculating Flow the commutation inductance L in device model3p；
It should be noted that pass through two commutation inductance L by connecting3pThe equivalent transverter of transverter model of composition, and Calculate the commutation inductance L in transverter model3p。
202nd, emotional resistance Z is passed throughacEquivalent AC system, RLC connection in series-parallel capacitive reactances ZacfEquivalent AC wave filter, and By RLC connection in series-parallel capacitive reactances ZacfWith emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween, obtain including and change Flow the transverter equivalent model of device, AC system and alternating current filter；
It should be noted that pass through emotional resistance ZacEquivalent AC system, RLC connection in series-parallel capacitive reactances ZacfEquivalent AC Wave filter, and by RLC connection in series-parallel capacitive reactances ZacfWith emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween, Obtain including the transverter equivalent model of transverter, AC system and alternating current filter；
203rd, the transverter equivalent model comprising transverter, AC system and alternating current filter is accessed into DC line entrance Hold in harmonic impedance equivalent model.
It should be noted that the transverter equivalent model comprising transverter, AC system and alternating current filter will be accessed In DC line arrival end harmonic impedance equivalent model, DC line arrival end harmonic impedance equivalent model is obtained, wherein, direct current Smoothing reactor, DC filter and earthing pole lead in the harmonic impedance equivalent model of line inlet end use original mould Type, without changing.
Further, an implementation of a kind of DC line arrival end harmonic impedance frequency analysis method provided by the invention Example also includes：
204th, in the smoothing reactor line side of DC line arrival end harmonic impedance equivalent model, insertion amplitude is specified The direct voltage source of value；
205th, test voltage source is inserted in the smoothing reactor line side of DC line arrival end harmonic impedance equivalent model, Recording voltage source both end voltage signal and the current signal for flowing through voltage source；
206th, Fourier decomposition is carried out to voltage signal and current signal, obtains harmonic voltage amplitude versus frequency characte and harmonic current Amplitude versus frequency characte, harmonic voltage amplitude versus frequency characte and harmonic current amplitude versus frequency characte are divided by obtain DC line arrival end harmonic impedance width Frequency characteristic.
It should be noted that harmonic voltage amplitude versus frequency characte and harmonic current amplitude versus frequency characte are divided by obtain DC line entrance Hold harmonic impedance amplitude versus frequency characte.
Further, one of a kind of HVDC transmission line arrival end harmonic impedance analysis method provided by the invention Embodiment also includes：
207th, Fourier decomposition is carried out to voltage signal and current signal, obtains harmonic voltage phase-frequency characteristic and harmonic current Phase-frequency characteristic, harmonic voltage phase-frequency characteristic is subtracted each other with harmonic current phase-frequency characteristic to obtain DC line arrival end harmonic impedance phase Frequency characteristic.
It should be noted that harmonic voltage phase-frequency characteristic and harmonic current phase-frequency characteristic are subtracted each other to obtain DC line entrance Hold harmonic impedance phase-frequency characteristic.
In embodiments of the present invention, after DC line arrival end harmonic impedance equivalent model is obtained, to DC line Arrival end harmonic impedance equivalent model carry out impedance frequency characteristic test, in a manner of bipolar symmetrical operation exemplified by, testing procedure bag Include：
(1) DC line arrival end harmonic impedance equivalent model, its parameter such as table 1 below are established in PSCAD/EMTDC platforms It is described；
Frequency-response analysis method schematic diagram of the table 1 based on time-domain-simulation
(2) in the smoothing reactor line side of DC line arrival end harmonic impedance equivalent model, insertion amplitude is rated value Direct voltage source E, provide stable operating point for the nonlinear system.
(3) in the smoothing reactor valve side of DC line arrival end harmonic impedance equivalent model insertion test voltage source eb, Its phase is 0 °, amplitude 0.5kV, and frequency is 1~170Hz, measures simultaneously recording voltage source both end voltage signal and flows through voltage The current signal in source.
(4) Fourier decomposition is carried out to voltage signal and current signal, obtains harmonic voltage amplitude versus frequency characte and harmonic current Amplitude versus frequency characte, harmonic voltage amplitude versus frequency characte and harmonic current amplitude versus frequency characte are divided by obtain DC line arrival end harmonic impedance width Frequency characteristic, as shown in Figure 9.
(5) Fourier decomposition is carried out to voltage signal and current signal, obtains harmonic voltage phase-frequency characteristic and harmonic current Phase-frequency characteristic, harmonic voltage phase-frequency characteristic is subtracted each other with harmonic current phase-frequency characteristic to obtain DC line arrival end harmonic impedance phase Frequency characteristic, as shown in Figure 10.
Fig. 9 and Figure 10 are referred to, Fig. 9 is a kind of DC line arrival end harmonic impedance frequency analysis side provided by the invention The amplitude-versus-frequency curve for the DC line arrival end harmonic impedance that method obtains, Figure 10 are that a kind of DC line provided by the invention enters The phase-frequency characteristic curve for the DC line arrival end harmonic impedance that mouth end harmonic impedance frequency analysis method obtains.
Wherein, Fig. 9 and Figure 10 abscissa is different value frequency, under different value frequencies, passes through the present invention The amplitude for the DC line arrival end harmonic impedance that the DC line arrival end harmonic impedance frequency analysis method of proposition obtains with Phase.
It can be clearly seen that DC line arrival end harmonic impedance computational methods and DC line arrival end harmonic impedance The amplitude-versus-frequency curve and phase-frequency characteristic curve of DC line arrival end harmonic impedance obtained by frequency analysis method weigh substantially Folded, two methods can obtain DC line arrival end harmonic impedance value, and DC line arrival end harmonic impedance calculating side The transverter model that the proposition of method is solved in the harmonic impedance parsing equivalent model of HVDC loop contains converter transformer sleeve Stray capacitance, add the complexity of circuit, making it difficult to derive the analytical expression of corresponding equivalent impedance, caused nothing Method derives the technical problem of DC line arrival end harmonic impedance by calculating.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

  1. A kind of 1. DC line arrival end harmonic impedance equivalent model, it is characterised in that including：Transverter, AC system impedance And alternating current filter；
    The transverter is equivalent to two commutation inductance L by connecting3pThe transverter model of composition；
    The AC system equivalent impedance is emotional resistance Zac；
    The alternating current filter is equivalent to RLC connection in series-parallel capacitive reactances Zacf；
    The RLC connection in series-parallel capacitive reactances ZacfWith the emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pIt Between；
    The commutation inductance L3pFirst it is non-series connection end be connected with DC line；
    The commutation inductance L3pSecond it is non-series connection end be connected with earthing pole lead.
  2. 2. DC line arrival end harmonic impedance equivalent model according to claim 1, it is characterised in that also include：It is flat Wave reactor；
    The first end of the smoothing reactor is connected with the DC line；
    Second end of the smoothing reactor and the commutation inductance L3pFirst it is non-series connection end connection.
  3. 3. DC line arrival end harmonic impedance equivalent model according to claim 2, it is characterised in that also include：Directly Flow wave filter；
    The DC filter is connected in parallel on the first end of the smoothing reactor and the commutation inductance L3pThe second non-series connection end Between.
  4. A kind of 4. DC line arrival end harmonic impedance computational methods, based on DC line arrival end as claimed in claim 3 Harmonic impedance equivalent model, it is characterised in that including：
    S1, the leakage inductance L for obtaining converter power transformerC, the emotional resistance Z of AC system equivalent impedanceac, AC system changes with described The first no-load voltage ratio k of the converter power transformer between device is flowed, is connected to the quantity n of the transverter of same ac bus, is handed over Flow the equivalent RLC connection in series-parallel capacitive reactances Z of wave filteracf；
    The commutation inductance L in S2, the calculating transverter model3p, wherein,
    S3, calculate the emotional resistance ZacConvert the emotional resistance Z of the valve side of the converter power transformerdc, wherein,
    S4, calculate the capacitive reactances ZacfConvert the capacitive reactances Z of the valve side of the converter power transformeracf_dc, wherein,
    S5, the equivalence for calculating the transverter equivalent model comprising the transverter, the AC system and the alternating current filter Impedance Zc, wherein,
    S6, obtain smoothing reactor impedance Zs, DC filter impedance Zdcf, earthing pole lead impedance Zj, according to preset operation side Formula calculates the DC line arrival end harmonic impedance Z.
  5. 5. DC line arrival end harmonic impedance computational methods according to claim 4, it is characterised in that the preset fortune When line mode is bipolar symmetrical operation mode, the DC line arrival end harmonic impedance
  6. 6. DC line arrival end harmonic impedance computational methods according to claim 4, it is characterised in that the preset fortune When line mode is the monopolar metallic return method of operation, the DC line arrival end harmonic impedance
  7. 7. DC line arrival end harmonic impedance computational methods according to claim 4, it is characterised in that the preset fortune When line mode is the monopolar ground return method of operation, the DC line arrival end harmonic impedance
  8. A kind of 8. DC line arrival end harmonic impedance frequency analysis method, based on as described in any one in claims 1 to 3 DC line arrival end harmonic impedance equivalent model tested, it is characterised in that including：
    Pass through two commutation inductance L by connecting3pThe equivalent transverter of transverter model of composition, and calculate the transverter model In the commutation inductance L3p；
    Pass through emotional resistance ZacEquivalent AC system, RLC connection in series-parallel capacitive reactances ZacfEquivalent AC wave filter, and by the RLC Connection in series-parallel capacitive reactances ZacfWith the emotional resistance ZacAfter parallel connection, two commutation inductance L are connected on3pBetween, wrapped Transverter equivalent model containing the transverter, the AC system and the alternating current filter；
    The transverter equivalent model comprising the transverter, the AC system and the alternating current filter is accessed into direct current In the harmonic impedance equivalent model of line inlet end.
  9. 9. DC line arrival end harmonic impedance frequency analysis method according to claim 8, it is characterised in that also wrap Include：
    In the smoothing reactor line side of the DC line arrival end harmonic impedance equivalent model, insertion amplitude is rated value Direct voltage source；
    In the smoothing reactor line side of DC line arrival end harmonic impedance equivalent model insertion test voltage source, record The voltage source both end voltage signal and the current signal for flowing through the voltage source；
    Fourier decomposition is carried out to the voltage signal and the current signal, obtains harmonic voltage amplitude versus frequency characte and harmonic current Amplitude versus frequency characte, the harmonic voltage amplitude versus frequency characte and the harmonic current amplitude versus frequency characte are divided by obtain DC line arrival end humorous Wave impedance amplitude versus frequency characte.
  10. 10. DC line arrival end harmonic impedance frequency analysis method according to claim 9, it is characterised in that also wrap Include：
    Fourier decomposition is carried out to the voltage signal and the current signal, obtains harmonic voltage phase-frequency characteristic and harmonic current Phase-frequency characteristic, the harmonic voltage phase-frequency characteristic and the harmonic current phase-frequency characteristic are subtracted each other to obtain DC line arrival end humorous Wave impedance phase-frequency characteristic.
CN201710884751.8A 2017-09-26 2017-09-26 DC line arrival end harmonic impedance equivalent model, calculating and frequency analysis method Pending CN107425536A (en)

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CN110543736A (en) * 2019-09-10 2019-12-06 南方电网科学研究院有限责任公司 Alternating current filter performance and steady-state fixed value calculation method
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CN112072687B (en) * 2020-08-24 2022-01-18 华南理工大学 Method for determining stray capacitance value of alternating current filter
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CN114024305A (en) * 2021-11-04 2022-02-08 中国南方电网有限责任公司超高压输电公司广州局 50HZ harmonic amplification factor detection method and device for high-voltage direct-current transmission system
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