CN106099967B - The equivalent circuit of the small interference impedance of flexible direct current converter station - Google Patents
The equivalent circuit of the small interference impedance of flexible direct current converter station Download PDFInfo
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- CN106099967B CN106099967B CN201610318967.3A CN201610318967A CN106099967B CN 106099967 B CN106099967 B CN 106099967B CN 201610318967 A CN201610318967 A CN 201610318967A CN 106099967 B CN106099967 B CN 106099967B
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- small interference
- direct current
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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
- 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]
Abstract
The invention discloses a kind of equivalent circuits of the small interference impedance of flexible direct current converter station, realize that a complicated multiterminal flexible direct current network system, which is reduced to a current conversion station to be analyzed, in small interference analysis represents with one the model that the equiva lent impedance of system other parts is connected by the equivalent circuit.The equivalent circuit meter and every control parameter of local control of the present invention coordinate the various ways of control and its operating condition of parameter and primary system, therefore have higher precision；Having ignored simultaneously influences other termination stability analysis smaller converter valve time constant, therefore reduces the complexity of model, advantageously reduces the calculating time of small interference analysis, realizes the balance of rapidity and accuracy in small interference analysis.
Description
Technical field
The present invention relates to the equivalent methods of small interference impedance in flexible direct current power grid analysis on Small Disturbance Stability, and in particular to
The equivalent circuit of the small interference impedance of flexible direct current converter station.
Background technology
Voltage stability is the important indicator of AC network safe and stable operation, and relative to AC network, flexible direct current
Power grid generally accesses more power electronic equipments, such as transverter, commutator transformer, these power electronic equipments are to voltage wave
Dynamic tolerance is not usually high.Therefore the stability of flexible direct current network voltage is maintained to have even more important meaning.
The static stability analysis of flexible direct current system mainly uses small interference analysis method at present.Some existing multiterminal are soft
Property straight-flow system Small signal stability analysis method by the characteristic value of analysis system characteristic equation matrix, and when system scale increases
When big, the scale of characteristic equation matrix can also increase therewith, and need when system structure or Parameters variation to recalculate the whole network
System features equation, calculation amount is excessive, to solving speed generation seriously affect.And other small interference analysis methods then basis
The difference (inductively or capacitively) of transverter access DC grid exit element will be divided into voltage with the current conversion station locally controlled
Source and current source type, and it is further simplified as non-ideal voltage source or current source, these methods excessively simplify again, can not ensure essence
Degree.In the analysis of multiterminal flexible direct current Network Voltage Stability, the small interference impedance circuit for establishing current conversion station is needed, is this this hair
The bright small interference equivalent impedance circuit for establishing a flexible direct current converter station.
Invention content
The object of the present invention is to provide a kind of equivalent circuits of the small interference impedance of flexible direct current converter station, in order to flexible straight
Galvanic electricity net Small disturbance voltage stability is analyzed, equivalent circuit meter of the invention and every control parameter of local control, coordination
The various ways and its parameter of control and the operating condition of primary system, therefore have higher precision；It has ignored simultaneously to it
He influences smaller converter valve time constant at end stability analysis, therefore reduces the complexity of model, advantageously reduces small
Interfere the calculating time of analysis.
To realize the purpose of foregoing invention, its technical problem is solved, the present invention is based on DC voltage in small interference analysis
With the small interference volume of electric current, the equiva lent impedance of current conversion station in flexible direct current power grid is calculated, the technical solution of use is as follows：
It is K to use double -loop control, current inner loop scale parameter for local controlp, integral parameter Ki, power outer shroud ratio
Example parameter is Kp2, DC side interelectrode capacity is the current conversion station of C, if current conversion station coordinates the value and power reference of control outputUsing
Following mathematical characteristic：Wherein parameter kUdc(n)And kPRespectively direct current
The droop control weight of voltage and output power, kUdc(n)And kPIt is asynchronously the index that 0, n is DC voltage, UDCrefFor the change of current
Device direct voltage reference value, PsFor AC power output power, PsrefFor AC power output power reference value, current conversion station is not
It can be obtained by the following method with the small interference impedance under operating mode：
Converter valve is exchanged side system positive sequence inductance to be added with single-phase change of current inductance to obtain exchange side total inductance Lac, by system
Positive sequence resistance is added to obtain exchange side all-in resistance R with single-phase change of current equivalent resistanceac, AC supply voltage fundamental wave is obtained by measurement
Phasor Us, transverter DC voltage UDC0, Converter DC-side electric current IDC0, by UsIt is converted under d/q synchronous coordinate systems, i.e.,
Enable Us=usd0+j·usq0, transverter output power PDC0=UDC0×IDC0；Calculating current inner ring time constant obtains ωi=Kp/
Lac；In the case where being not counted in Converter DC-side shunt inductance, the circuit of the equiva lent impedance of current conversion station in flexible direct current power grid
Structure be a resistance value be R1Resistance and inductance value be L1Inductance series connection, then with a resistance value be R2Electricity
Resistance is in parallel, wherein R1、L1And R2Calculation formula such as following formula：
Compared with the conventional method, the advantages of this method is：The present invention establishes a kind of small interference of flexible direct current converter station
The equivalent circuit of impedance.The circuit meter and control parameter and control mode, therefore for using the various changes of current for coordinating control
It stands, circuit of the invention can carry out accurate equivalent；Since the circuit of the present invention considers operating condition, when current conversion station connects
The operating mode of the AC system or straight-flow system that enter changes, and equivalent circuit of the invention can carry out accurate equivalent；In addition it neglects
Converter valve time constant has been omited, to reduce the complexity of model in the case where not influencing accuracy, has been advantageously reduced
The calculating time of small interference analysis；If k simultaneouslyPOr kUdc(n)It is 0, i.e., current conversion station, which uses, determines DC voltage or output power
When, equivalent circuit of the invention can intuitively simplify the small interference impedance of current conversion station, contribute to flexible direct current system
System is reduced to a passive network to facilitate Small signal stability analysis：Therefore the equivalent circuit of the present invention realizes small interference analysis
The balance of middle rapidity and accuracy.
Description of the drawings
Fig. 1 is the equivalent circuit computational intelligence observing and controlling dress of the small interference impedance of the flexible direct current converter station described in present example
Set wiring schematic diagram.
Specific implementation mode
The equivalent circuit of the small interference impedance of flexible direct current converter station of the present invention, is particularly suitable in flexible direct current power grid
Small interference by end analyze.1 pair of specific implementation of the invention is described further below in conjunction with the accompanying drawings.
Intelligent measuring and control device is current widely used measure and control device, it is usually by analogue collection module, central processing
The module compositions such as unit, communication module, man-machine interface.
Fig. 1 shows the flexible direct current converter station simplified models of an access AC and DC system, and the method for the present invention is in intelligence
It is calculated in device 1.The analogue collection module of intelligent measuring and control device 1 connects AC power by AC voltage transformer 2,
And the direct current that current conversion station is connected by direct current voltage sensor 3 and DC current sensor 4 exports, communication module connection control
The communication module of device 6.Flexible direct current power grid Small signal stability analysis central processing unit 5 connects intelligent measuring and control device 1 and VSC
The communication module of control device 6, at the same with the intelligent measuring and control device of other termination in flexible direct current power grid and VSC control device phases
Even.
Intelligent measuring and control device 1 obtains converter valve by man-machine interface and exchanges side system positive sequence resistance, inductance and the single-phase change of current
Resistance, inductance measure AC supply voltage fundamental phasors, DC voltage and DC current, respectively by analog acquisition circuit
It is denoted as Us、UDC0、IDC0, the local control in VSC control devices 6 using double -loop control is obtained by communication module and coordinates to control
Control parameter, wherein current inner loop scale parameter is denoted as Kp, integral parameter is denoted as Ki, power outer shroud is using simple ratio ring
Section control, scale parameter are denoted as Kp2, the DC voltage and the weight of output power of coordinating control are denoted as k respectivelyUdc(n)And kP。
Then intelligent measuring and control device 1 is by UsIt is converted under d/q synchronous coordinate systems, even Us=usd0+j·usq0, will
UDC0And IDC0It is multiplied, it is P to obtain transverter output powerDC0=UDC0×IDC0；Converter valve is exchanged into side system positive sequence inductance simultaneously
It is added to obtain exchange side total inductance L with single-phase change of current inductanceac, system positive sequence resistance is added to obtain with single-phase change of current equivalent resistance
Exchange side all-in resistance Rac, and calculating current inner ring time constant obtains ωi=Kp/Lac.Later according to R1、L1And R2Calculation formula,
It can be obtained the circuit of the current conversion station equiva lent impedance in flexible direct current power grid.
If specifically, the current conversion station uses droop control form, i.e. kPAnd kUdc(n)Be not 0, then the electricity of its equiva lent impedance
It is R that the structure on road (not being included in Converter DC-side shunt inductance), which is a resistance value,1Resistance and inductance value be L1Electricity
Sense series connection, then with a resistance value be R2Resistor coupled in parallel, wherein R1、L1And R2Calculation formula such as following formula：
If the output power form that the current conversion station uses, i.e. kUdc(n)It is 0, then the circuit of its equiva lent impedance (is not counted
Enter Converter DC-side shunt inductance) structure in R1、L1It is intended to ∞, equiva lent impedance is that a resistance value is R2Electricity
Resistance, R2Calculation formula such as following formula：
Last intelligent measuring and control device 1 is small to the transmission local terminal of Small signal stability analysis central processing unit 5 by communication module
Interfere the equivalent circuit parameter R of impedance1、L1And R2Result of calculation.Respectively hold current conversion station small dry in flexible direct current power grid by receiving
The anti-equivalent circuit of interference resistance, Small signal stability analysis central processing unit 5 are soft by a complicated multiterminal in small interference analysis
Property DC grid system be reduced to a current conversion station to be analyzed (using detailed small disturbance analysis model) and represent system with one
Other parts, the model that the passive network being made of small interference impedance is connected, to be reduced in the case where not influencing accuracy
The complexity of model realizes the balance of rapidity and accuracy in small interference analysis.When small interference analysis result is shakiness
Periodically, Small signal stability analysis central processing unit 5 sends out the signal of adjustment control parameter to VSC control devices 6, to keep
Flexible direct current network system small signal stability.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (1)
1. a kind of equivalent circuit of the small interference impedance of flexible direct current converter station, it is characterised in that：Double -loop control is used for local control,
Current inner loop scale parameter is Kp, integral parameter Ki, power outer shroud scale parameter is Kp2, DC side interelectrode capacity is the current conversion station of C, is changed
Coordinate the value and power reference of control output in stream stationUsing following mathematical characteristic：
Wherein parameter kUdc(n)And kPThe respectively droop control weight of DC voltage and output power, kUdc(n)And kPIt is asynchronously that 0, n is
The index of DC voltage, UDCFor transverter DC voltage, UDCrefFor transverter direct voltage reference value, PsIt is exported for AC power
Power, PsrefFor AC power output power reference value, small interference impedance of the current conversion station under different operating modes can be by as follows
Method obtains：
Transverter is exchanged side system positive sequence inductance to be added with single-phase change of current inductance to obtain exchange side total inductance Lac, by system positive sequence
Resistance is added to obtain exchange side all-in resistance R with single-phase change of current equivalent resistanceac, AC supply voltage fundamental phasors are obtained by measurement
Us, transverter DC voltage UDC0, Converter DC-side electric current IDC0, by UsIt is converted under d/q synchronous coordinate systems, even Us
=usd0+j·usq0, transverter output power PDC0=UDC0×IDC0；Calculating current inner ring time constant obtains ωi=Kp/Lac；
In the case where being not counted in Converter DC-side shunt inductance, the equiva lent impedance Z of current conversion station in flexible direct current power gridtcIt can utilize
Following equivalent circuit indicates that structure is that a resistance value is R2Resistance and inductance value be L1Inductance series connection, then with one
A resistance value is R2Resistor coupled in parallel, wherein R1、L1And R2Calculation formula such as following formula：
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545201A (en) * | 2011-12-27 | 2012-07-04 | 上海交通大学 | Method for establishing high-voltage direct-current small signal model |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545201A (en) * | 2011-12-27 | 2012-07-04 | 上海交通大学 | Method for establishing high-voltage direct-current small signal model |
Non-Patent Citations (2)
| Title |
|---|
| Input-Admittance Calculation and Shaping for Controlled Voltage-Source Converters;Lennart Harnefors, et al;《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》;20071231;第54卷(第6期);3323-3334 * |
| 直流配网中换流站的电流限幅控制研究;金阳忻，等;《机电工程》;20160430;第33卷(第4期);470-475 * |
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