CN108233400A - A kind of more feed-in interaction factor computational methods of meter and hvdc control mode - Google Patents
A kind of more feed-in interaction factor computational methods of meter and hvdc control mode Download PDFInfo
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- CN108233400A CN108233400A CN201711347835.4A CN201711347835A CN108233400A CN 108233400 A CN108233400 A CN 108233400A CN 201711347835 A CN201711347835 A CN 201711347835A CN 108233400 A CN108233400 A CN 108233400A
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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
- 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 invention discloses more feed-in interaction factor computational methods of a kind of meter and hvdc control mode, first define more feed-in interaction factors of meter and hvdc control mode, it is traditional do not count and the calculation formula of straight-flow system control mode multi-infeed interaction factor in, it derives and introduces correction factor of the hvdc control mode to more feed-in interaction factors, the idle sensitivity to change of current busbar voltage, which is absorbed, by calculating under straight-flow system different control modes transverter obtains the correction factor, traditional more feed-in interaction factors are obtained by the calculating of system node impedance matrix, so as to finally provide more feed-in interaction factor practical calculation methods of a kind of meter and hvdc control mode.With this method can easily to influence MIIF values factor carry out quantitative analysis, solve the disadvantage that existing MIIF computational methods do not count and hvdc control mode and calculate analysis efficiency it is low.
Description
Technical field
The present invention relates to Power System and its Automation technical fields, and in particular to it is a kind of count and hvdc control mode it is more
Feed-in interaction factor computational methods.
Background technology
With China " transferring electricity from the west to the east " implementation, a large amount of high voltage direct current transmission projects put into operation in China, and in China
The load centers such as east, south China form the power grid architecture of multiple-circuit line feed-in, influencing each other more between multiple-circuit line in system
Invention is aobvious.Research shows that the interaction between straight-flow system has a great impact to the stable state and dynamic characteristic of electric system.
Therefore, this interaction is studied, it is significant to the planning operation of electric system.
CIGRE multi-infeed HVDC system research work groups propose more feed-in interaction factors and carry out phase to multiple-circuit line
It mutually influences to be assessed, and give the voltage deviation ratio calculation method defined based on MIIF.This method is succinct, intuitive, but
Thus the MIIF that method obtains is an experimental index, can not predict influence of the electric network composition variation to the factor values.
MIIF computational methods equivalences based on Jacobian matrix are a kind of Analytic Calculations, can be fast to MIIF by programming
Speed is calculated.However the analytic expression of this method is related to matrix inversion calculating, the work played to each influence factor to MIIF values
It is not intuitive with embodying, it is difficult to which that from expression formula, to MIIF, each influence factor is analyzed in itself, and must be by largely calculating knot
Fruit is come the changing rule of MIIF when obtaining influence factor variation under certain condition.This in this way to analyze MIIF
When it is inefficient, and lack foresight.
The calculating of MIIF and convenient for analysis for simplicity, the scholars such as Denis LHA propose another MIIF practicality meter
Calculation method, i.e. equivalent impedance are provided than method, this method in the form of simple analytical expression, intuitive, succinct, can to MIIF into
Row is quick to be calculated, but this method does not consider the influence of straight-flow system control mode.Fortune in this way can only be to equivalence exchange system
Influence of the parameter of uniting to MIIF is studied.Since control mode influences significantly the result of calculation of MIIF, the method is calculating
When there are large errors.
Invention content
In view of the deficiencies of the prior art, it is an object of the present invention to provide more feed-ins friendships of a kind of meter and hvdc control mode
Interaction factor computational methods, it is equivalent that the method mainly considers hvdc control mode, straight-flow system capacity and receiving-end system
Influence of the parameter to MIIF values, is provided in the form of simple analytical expression, so as to conveniently, intuitively be carried out to MIIF values
It calculates and analyzes.
The purpose of the present invention can be achieved through the following technical solutions：
More feed-in interaction factor computational methods of a kind of meter and hvdc control mode, the method includes following steps
Suddenly：
1) more feed-in interaction factors of meter and hvdc control mode between straight-flow system i and straight-flow system j are defined
MIIFijIt is as follows：
MIIFij=kMIIF'ij (1)
Wherein,
In formula, MIIF'ijIt is not counted between expression straight-flow system i and straight-flow system j and more feed-ins of hvdc control mode interacts
Acting factor, MIIF'ijValue is calculated by formula (2), and k is the correction factor of meter and hvdc control mode；ZijFor on straight-flow system i
The mutual impedance amplitude of change of current busbar on change of current busbar and straight-flow system j；ZiiSelf-impedance width for change of current busbar on straight-flow system i
Value, ZjjSelf-impedance amplitude for change of current busbar on straight-flow system j；QdiIdle, U is absorbed for transverteriFor the change of current on straight-flow system i
The voltage of busbar, dQdi/dUiRepresent that transverter absorbs the idle sensitivity to change of current busbar voltage, θiiTo be changed on straight-flow system i
Flow the impedance angle of busbar self-impedance；Pi、PjThe respectively power of straight-flow system i and straight-flow system j；A is related coefficient, is removed in formula
All variables outside angle are all perunit values, and capacity is on the basis of the rated capacity of straight-flow system i, and DC voltage is with direct current volume
On the basis of constant voltage, exchange side voltage is on the basis of ac rated voltage；
2) straight-flow system i transverters under different control modes are calculated and absorb the idle sensitivity to change of current busbar voltage
dQdi/dUi；
3) the correction factor k of meter and hvdc control mode is calculated according to formula (3) and formula (4)；
4) according to formula (1) calculate for current multi-infeed DC Power grid structure meter and hvdc control mode it is more
Feed-in interaction factor MIIFij。
Further, straight-flow system i transverters under different control modes are calculated described in step 2) and absorb idle exchange
Flow the sensitivity dQ of busbar voltagedi/dUiIt is that the external characteristics mathematical model based on transverter obtains, the outer spy of the transverter
Property mathematical model then obtained based on the straight-flow system quasi-steady state equation of reactive power compensator on meter and change of current busbar；In different controls
Under mode processed, mathematical model and the transverter absorption of straight-flow system i Inverter Station external characteristics are idle to the sensitive of change of current busbar voltage
Spend dQdi/dUiFormula be respectively：
(1) external characteristics is when straight-flow system is in constant current/determine gamma kick：
In formula：Ud0iFloating voltage for Inverter Station DC side；UdiFor Inverter Station DC voltage；IdiFor DC current；γi
For inverter side blow-out angle；TiNo-load voltage ratio for converter power transformer；B is the number of six pulse conversion bridges；XiFor single bridge change of current reactance；Km
For corresponding coefficient；DC current and blow-out angle remain command value under constant current/determine gamma kick mode：
Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：
(2) external characteristics is when straight-flow system, which is in, determines power/determine gamma kick：
In formula, PdriFor converting plant transmission power；R1Resistance for DC line；dmFor corresponding substitutional resistance；Determining work(
Rate/determine dc power and blow-out angle under gamma kick mode remains command value：
Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：
(3) external characteristics is when straight-flow system, which is in, determines DC voltage/determine gamma kick：
In formula, UdriDC voltage for rectification side；The rectification side direct current in the case where determining DC voltage/constant current control mode
Pressure and DC current remain command value：
Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：
Above-mentioned is for three kinds of control modes：Constant current/determine gamma kick, determine power/is determined gamma kick, is determined directly
Galvanic electricity pressure/determine gamma kick, mathematical model and the transverter absorption of straight-flow system i Inverter Station external characteristics are idle to change of current busbar
The sensitivity dQ of voltagedi/dUiFormula.
Further, the meter and DC control for current multi-infeed DC Power grid structure are calculated described in step 4)
More feed-in interaction factor MIIF of modeij, can be calculated in steady-state operation, also can in grid collapses or
Disturbance causes grid structure to change, calculated in the transient process of HVDC control mode switchings；When failure or disturbance cause rack knot
When structure changes, recalculate system impedance matrix according to formula (2) and do not count and more feed-in reciprocations of hvdc control mode
Factor M IIF'ij, the sensitivity of transverter reactive voltage and correction factor are recalculated according to step 2) and step 3)；When failure or
When disturbance causes the hvdc control mode to switch, corresponding calculation formula is selected to recalculate transverter according to different hvdc control modes
Reactive voltage sensitivity and correction factor；It can finally be calculated in transient process for current grid structure and meter and direct current
More feed-in interaction factor MIIF of control modeij。
Compared with prior art, the present invention having the following advantages that and advantageous effect：
The present invention proposes a kind of preparation method of the multi-infeed HVDC interaction factor of meter and hvdc control mode, institute
It states method and mainly considers the influence of hvdc control mode, straight-flow system capacity and receiving-end system equivalent parameters to MIIF values, with
The form of simple analytical expression provides, the mathematics, clear physical concept of the method, and calculating is accurate, speed is fast, with this public affairs
Formula easily MIIF values can be calculated or to hvdc control mode, straight-flow system capacity and receiving-end system equivalent parameters this
Influence of three elements to MIIF carries out determining quantifier elimination, influences each other for improvement straight-flow system and specifies direction.
Description of the drawings
Fig. 1 is the stream of more feed-in interaction factor computational methods of a kind of meter of the embodiment of the present invention and hvdc control mode
Cheng Tu.
Fig. 2 is more feed-in ac and dc systems simplified model schematic diagrames provided in an embodiment of the present invention.
Specific embodiment
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment：
Present embodiments provide more feed-in interaction factor computational methods of a kind of meter and hvdc control mode, the side
The flow chart of method is as shown in Figure 1, include the following steps：
1) more feed-in interaction factors of meter and hvdc control mode between straight-flow system i and straight-flow system j are defined
MIIFijIt is as follows：
MIIFij=kMIIF'ij (1)
Wherein,
In formula, MIIF'ijIt is not counted between expression straight-flow system i and straight-flow system j and more feed-ins of hvdc control mode interacts
Acting factor, MIIF'ijValue is calculated by formula (2), and k is the correction factor of meter and hvdc control mode；ZijFor on straight-flow system i
The mutual impedance amplitude of change of current busbar on change of current busbar and straight-flow system j；ZiiSelf-impedance width for change of current busbar on straight-flow system i
Value, ZjjSelf-impedance amplitude for change of current busbar on straight-flow system j；QdiIdle, U is absorbed for transverteriFor the change of current on straight-flow system i
The voltage of busbar, dQdi/dUiRepresent that transverter absorbs the idle sensitivity to change of current busbar voltage, θiiTo be changed on straight-flow system i
Flow the impedance angle of busbar self-impedance；Pi、PjThe respectively power of straight-flow system i and straight-flow system j；A is related coefficient, is removed in formula
All variables outside angle are all perunit values, and capacity is on the basis of the rated capacity of straight-flow system i, and DC voltage is with direct current volume
On the basis of constant voltage, exchange side voltage is on the basis of ac rated voltage；
2) straight-flow system i transverters under different control modes are calculated and absorb the idle sensitivity to change of current busbar voltage
dQdi/dUi；
3) the correction factor k of meter and hvdc control mode is calculated according to formula (3) and formula (4)；
4) according to formula (1) calculate for current multi-infeed DC Power grid structure meter and hvdc control mode it is more
Feed-in interaction factor MIIFij。
To verify the validity of the method, this gives double-feds as shown in Figure 2 to enter ac and dc systems, disregards
Reactive power compensator on change of current busbar, the impedance parameter of receiving-end system are as shown in table 1：
| Z1 | Z2 | Z3 | |
| Case1 | 0.410 | 0.273 | 0.542 |
| Case2 | 0.307 | 0.307 | 0.375 |
| Case3 | 0.237 | 0.361 | 0.275 |
| Case4 | 0.186 | 0.457 | 0.208 |
Table 1
The bus admittance matrix for remembering receiving-end system in case1-case4 is respectively Y1, Y2, Y3, Y4：
The nodal impedance matrix for remembering receiving-end system in case1-case4 is respectively Z1, Z2, Z3, Z4：
The equivalent impedance parameter Z obtained by nodal impedance matrix11、Z12、Z22As shown in table 2：
| Z11 | Z22 | Z12 | |
| Case1 | 0.273 | 0.213 | 0.091 |
| Case2 | 0.212 | 0.212 | 0.095 |
| Case3 | 0.172 | 0.212 | 0.100 |
| Case4 | 0.145 | 0.211 | 0.100 |
Table 2
More feed-in interaction factors when not considering hvdc control mode obtained by traditional practical calculation method can be with
It is obtained by the following formula：
The MIIF' being calculated by table 2ijAs shown in table 3：
| Case1 | Case2 | Case3 | Case4 | |
| MIIF'ij | 0.427 | 0.448 | 0.472 | 0.474 |
Table 3
Straight-flow system 1 in Fig. 2 is identical with the capacity of straight-flow system 2, used by Case1~Case4 examples model by
Two CIGRE direct currents standard test models are expanded to obtain to inverter side AC system, the different controls obtained by step 3)
Under mode meter and change of current busbar on reactive power compensator straight-flow system absorb the idle sensitivity to change of current busbar voltage (i.e.
dQd1/dU1) as shown in table 4：
Table 4
It is to the correction amount k of the meter and hvdc control mode formula calculated：
The meter and the correction amount k of hvdc control mode acquired by the data in table 2 and table 4 is as shown in table 5：
Table 5
The multi-infeed interaction factor of meter and hvdc control mode can be obtained by the following formula：
MIIFij=kMIIF'ij
The multi-infeed interaction factor of meter and hvdc control mode can be obtained by the data in table 3 and table 5.Note we
The MIIF that method obtains12Result of calculation be " analytical Calculation result ", the MIIF obtained with the simulation method according to definition12Result of calculation
For " simulation result ".Different receiving-end system parameters, straight-flow system 1 form different calculations using under different control modes
The result of calculation of two methods that example obtains is as shown in table 6：
Table 6
Error that result of calculation shows the method that the present embodiment provides between the MIIF emulated computation methods that are obtained by definition
Very little, can effectively embody influence of the different control modes to MIIF values, and result of calculation is accurate.And the MIIF that the present invention provides
Calculation formula is succinctly intuitive, can be easily to hvdc control mode, straight-flow system capacity and receiving-end system equivalent parameters pair
The influence of MIIF values is analyzed.
The above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to
This, any one skilled in the art is in the range disclosed in patent of the present invention, according to the skill of patent of the present invention
Art scheme and its patent of invention design are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.
Claims (3)
- A kind of 1. more feed-in interaction factor computational methods of meter and hvdc control mode, which is characterized in that the method packet Include following steps：1) more feed-in interaction factor MIIF of meter and hvdc control mode between straight-flow system i and straight-flow system j are definedijSuch as Under：MIIFij=kMIIF'ij (1)Wherein,In formula, MIIF'ijIt represents not count and more feed-in reciprocations of hvdc control mode between straight-flow system i and straight-flow system j The factor, MIIF'ijValue is calculated by formula (2), and k is the correction factor of meter and hvdc control mode；ZijFor the change of current on straight-flow system i The mutual impedance amplitude of change of current busbar on busbar and straight-flow system j；ZiiFor the self-impedance amplitude of change of current busbar on straight-flow system i, Zjj Self-impedance amplitude for change of current busbar on straight-flow system j；QdiIdle, U is absorbed for transverteriFor change of current busbar on straight-flow system i Voltage, dQdi/dUiRepresent that transverter absorbs the idle sensitivity to change of current busbar voltage, θiiIt is female for the change of current on straight-flow system i The impedance angle of line self-impedance；Pi、PjThe respectively power of straight-flow system i and straight-flow system j；A is related coefficient, and angle is removed in formula Outer all variables are all perunit values, and capacity is on the basis of the rated capacity of straight-flow system i, and DC voltage is with the specified electricity of direct current On the basis of pressure, exchange side voltage is on the basis of ac rated voltage；2) straight-flow system i transverters under different control modes are calculated and absorb the idle sensitivity dQ to change of current busbar voltagedi/ dUi；3) the correction factor k of meter and hvdc control mode is calculated according to formula (3) and formula (4)；4) more feed-ins of the meter and hvdc control mode for current multi-infeed DC Power grid structure are calculated according to formula (1) Interaction factor MIIFij。
- 2. more feed-in interaction factor computational methods of a kind of meter according to claim 1 and hvdc control mode, It is characterized in that, it is idle to change of current busbar electricity that straight-flow system i transverter absorptions under different control modes is calculated described in step 2) The sensitivity dQ of pressuredi/dUiIt is that the external characteristics mathematical model based on transverter obtains, the external characteristics mathematical modulo of the transverter Straight-flow system quasi-steady state equation of the type then based on reactive power compensator on meter and change of current busbar obtains；In different control modes Under, the mathematical model and transverter of straight-flow system i Inverter Station external characteristics absorb the idle sensitivity dQ to change of current busbar voltagedi/ dUiFormula be respectively：(1) external characteristics is when straight-flow system is in constant current/determine gamma kick：In formula：Ud0iFloating voltage for Inverter Station DC side；UdiFor Inverter Station DC voltage；IdiFor DC current；γiIt is inverse Become side blow-out angle；TiNo-load voltage ratio for converter power transformer；B is the number of six pulse conversion bridges；XiFor single bridge change of current reactance；KmFor phase The coefficient answered；DC current and blow-out angle remain command value under constant current/determine gamma kick mode：Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：(2) external characteristics is when straight-flow system, which is in, determines power/determine gamma kick：In formula, PdriFor converting plant transmission power；R1Resistance for DC line；dmFor corresponding substitutional resistance；Determining power/fixed Dc power and blow-out angle remain command value under gamma kick mode：Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：(3) external characteristics is when straight-flow system, which is in, determines DC voltage/determine gamma kick：In formula, UdriDC voltage for rectification side；In the case where determining DC voltage/constant current control mode rectification side DC voltage and DC current remains command value：Thus obtaining the idle sensitivity to change of current busbar voltage of transverter absorption is：Above-mentioned is for three kinds of control modes：Constant current/determine gamma kick, determine power/determines gamma kick, determines direct current Press/determine gamma kick, mathematical model and the transverter absorption of straight-flow system i Inverter Station external characteristics are idle to change of current busbar voltage Sensitivity dQdi/dUiFormula.
- 3. more feed-in interaction factor computational methods of a kind of meter according to claim 1 and hvdc control mode, It is characterized in that：Described in step 4) calculate for current multi-infeed DC Power grid structure meter and hvdc control mode it is more Feed-in interaction factor MIIFij, can calculate in steady-state operation, can also cause in grid collapses or disturbance Grid structure changes, is calculated in the transient process of HVDC control mode switchings；When failure or disturbance cause grid structure to change, System impedance matrix is recalculated according to formula (2) and is not counted and more feed-in interaction factor MIIF of hvdc control mode 'ij, the sensitivity of transverter reactive voltage and correction factor are recalculated according to step 2) and step 3)；When failure or disturbance cause When hvdc control mode switches, corresponding calculation formula is selected to recalculate transverter reactive voltage according to different hvdc control modes Sensitivity and correction factor；It can finally be calculated in transient process for current grid structure and meter and hvdc control mode More feed-in interaction factor MIIFij。
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| CN109193735A (en) * | 2018-09-20 | 2019-01-11 | 国网山东省电力公司电力科学研究院 | HVDC converter substation multi-layer coordinates recovery control method and system |
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