CN110492517A - A kind of methods of risk assessment and system of Multi-infeed HVDC transmission system commutation failure - Google Patents
A kind of methods of risk assessment and system of Multi-infeed HVDC transmission system commutation failure Download PDFInfo
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- CN110492517A CN110492517A CN201910713604.3A CN201910713604A CN110492517A CN 110492517 A CN110492517 A CN 110492517A CN 201910713604 A CN201910713604 A CN 201910713604A CN 110492517 A CN110492517 A CN 110492517A
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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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- 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 methods of risk assessment of Multi-infeed HVDC transmission system commutation failure characterized by comprising obtains the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system；It obtains and simplifies the critical ac and dc systems voltage coupling factor；It is assessed according to the ac and dc systems voltage coupling factor and the risk for simplifying critical ac and dc systems voltage coupling factor pair Multi-infeed HVDC transmission system generation commutation failure, it solves that receiving-end system scale is big, many and diverse problem is calculated caused by ac bus Numerous.
Description
Technical field
This application involves Power System Planning and operation field, and in particular to a kind of Multi-infeed HVDC transmission system commutation mistake
The methods of risk assessment lost, while being related to a kind of risk evaluating system of Multi-infeed HVDC transmission system commutation failure.
Background technique
Energy resources and the unbalanced fundamental realities of the country of distribution of productive force determine that China's energy and electric power are trans-regional extensive
The certainty of flowing.High voltage dc transmission technology due to its transmission distance not by synchronous operation stability limited, transmission capacity
The advantages that big, has obtained very extensive application in terms of interconnection power system, long-distance and large-capacity power transmission.China's East China Power Grid
A plurality of DC transmission system short distance drop point has been had already appeared in the situation of same AC network with Guangdong Power Grid, i.e., more feed-ins are straight
Flow transmission system.When DC inversion station electrical couplings are close, the reciprocation between ac and dc systems is become more complicated, receiving end
Phylogenetic AC fault may cause multiple-circuit line system commutation failure simultaneously, result even in when AC fault is serious more
The transmission of direct current interrupt power is returned, so that the safe and stable operation to whole system brings grave danger.
How accurately and quickly to assess receiving-end system AC fault leads to the wind of multiple-circuit line system while commutation failure
Danger, for ensureing that China's power network safety operation, prevention large-scale blackout are of great significance.For this problem,
The concept that author proposes the ac and dc systems voltage coupling factor (number of patent application: 201710059035.6), and proposes
It is a kind of that direct current is assessed based on the ac and dc systems voltage coupling factor and the critical ac and dc systems voltage coupling factor
The fast method of system commutation failure risk, this method are not needed to carry out the whole network malfunction monitoring to electric system, be greatly reduced
Amount of calculation so can rapid evaluation multi-infeed HVDC system with the presence or absence of commutation failure risk simultaneously.Face due to solving
Boundary's ac and dc systems voltage coupling factor needs to calculate for every time ac bus, when multi-infeed HVDC system access by
When end AC network is on a grand scale, there is a problem of calculating many and diverse.
Summary of the invention
The present invention provides a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure, overcomes above-mentioned existing skill
The deficiency of art.
The present invention provides a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure, which is characterized in that packet
It includes:
Obtain the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system；
It obtains and simplifies the critical ac and dc systems voltage coupling factor；
According to the ac and dc systems voltage coupling factor and simplify critical ac and dc systems voltage coupling because
The risk that Multi-infeed HVDC transmission system commutation failure occurs for son is assessed.
Preferably, the ac and dc systems voltage coupling obtained between Multi-infeed HVDC transmission system and receiving end AC system
Acting factor, comprising:
The receiving end AC system node admittance matrix Y of node referenced to ground is established, then calculate node impedance matrix Z,
Z=Y-1
It is set with the n receiving end AC system bus for needing to pay close attention to, finds out n node from the nodal impedance matrix Z
Corresponding self-impedance and mutual impedance form node equivalent impedance Zeq；
The calculating of the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system
Formula is,
Wherein, ADVCFjmThe alternating current-direct current between direct current system inverter side change of current bus and receiving-end system ac bus m is returned for jth
The system voltage coupling factor；ZeqjmFor node equivalent impedance matrix ZeqJth row, m column element and jth return direct current
The mutual impedance of system inverter side change of current bus and receiving-end system ac bus m；ZeqmmFor node equivalent impedance matrix ZeqM
The self-impedance of row, m column element and receiving-end system ac bus m；J >=1, m >=1.
Preferably, the acquisition simplifies the critical ac and dc systems voltage coupling factor, including；
The calculation formula of the critical ac and dc systems voltage coupling factor is,
Wherein, CADVCFjmThe critical friendship of direct current system inverter side change of current bus and receiving-end system ac bus m is returned for jth
The direct current system voltage coupling factor, XKj% is the short-circuit reactance percentage that jth returns converter power transformer in direct current system Inverter Station
Than γminFor valve intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；
IdjAnd IdjNThe respectively running current and specified running current of jth time direct current system；ULj0The line of direct current system j inverter side change of current bus before breaking down for the receiving-end system ac bus m
Voltage, ULjNFor the rated value of the line voltage；ULm0It is broken down for the receiving-end system ac bus m
Preceding line voltage, ULmNFor the rated value of the line voltage；
γminFor valve intrinsic limit blow-out angle, be converter valve complete Carrier recombination, the time institute of restoring blocking ability it is right
The shutdown angle answered；
Have when receiving end AC system normal operation and direct current system rated power operation, ULj0 *≈ 1, ULm0 *≈ 1, Idj *=1,
γj17 ° of ≈, it is simplified the critical ac and dc systems voltage coupling factor,
Simplify the critical ac and dc systems voltage coupling factor (SCADVCFj) only device parameter (X with direct current jKj%)
It is related, it is unrelated with the operating parameter of receiving end ac bus m.
Preferably, described according to the ac and dc systems voltage coupling factor and simplified critical ac and dc systems voltage
The risk that commutation failure occurs for coupling factor pair Multi-infeed HVDC transmission system is assessed, comprising:
If ADVCFjm≥SCADVCFj, then jth is returned after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
There are the risks of commutation failure for direct current system；
If ADVCFjm< SCADVCFj, then jth is returned after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
The risk of commutation failure is not present in direct current system.
Corresponding with method provided by the invention, present invention simultaneously provides a kind of Multi-infeed HVDC transmission system commutation mistakes
The risk evaluating system lost characterized by comprising
The coupling of ac and dc systems voltage is handed over because of sub-acquisition module for obtaining Multi-infeed HVDC transmission system and receiving end
The ac and dc systems voltage coupling factor between streaming system；
Simplify acting factor and obtain module, simplifies the critical ac and dc systems voltage coupling factor for obtaining；
Risk evaluation module, for according to the ac and dc systems voltage coupling factor and simplified critical alternating current-direct current system
The risk that commutation failure occurs for system voltage coupling factor pair Multi-infeed HVDC transmission system is assessed.
The present invention provides a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure, simplifies critical alternating current-direct current
System voltage coupling level of factor.The same direct current system is having the same for different receiving end AC system buses
Simplify the critical ac and dc systems voltage coupling factor.Lead to multi-infeed HVDC system in rapid evaluation receiving-end system AC fault
System simultaneously commutation failure risk when, do not need to carry out every time receiving-end system ac bus to calculate and solve critical value, solve by
End system scale is big, and many and diverse problem is calculated caused by ac bus Numerous.
Detailed description of the invention
Fig. 1 is a kind of methods of risk assessment stream of Multi-infeed HVDC transmission system commutation failure provided in an embodiment of the present invention
Journey schematic diagram；
Fig. 2 be the present embodiments relate to two feed-in alternating current-direct current example systems equivalent circuit diagram；
Fig. 3 be the present embodiments relate to DC current simulation curve；
Fig. 4 be the present embodiments relate to dc power simulation curve；
Fig. 5 be the present embodiments relate to DC inversion station blow-out angle simulation curve.
Specific embodiment
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention.But the present invention can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to intension of the present invention the case where
Under do similar popularization, therefore the present invention is not limited to the specific embodiments disclosed below.
Fig. 1 is a kind of methods of risk assessment stream of Multi-infeed HVDC transmission system commutation failure provided in an embodiment of the present invention
Journey schematic diagram is described in detail method provided in an embodiment of the present invention below with reference to Fig. 1.
Step S101 obtains the ac and dc systems voltage between Multi-infeed HVDC transmission system and receiving end AC system and couples and makees
Use the factor.
The receiving end AC system node admittance matrix Y of node referenced to ground is established, then calculate node impedance matrix Z,
Z=Y-1
It is set with the n receiving end AC system bus for needing to pay close attention to, finds out n node from the nodal impedance matrix Z
Corresponding self-impedance and mutual impedance form node equivalent impedance Zeq；
The calculating of the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system
Formula is,
Wherein, ADVCFjmThe alternating current-direct current system of direct current system inverter side change of current bus and receiving-end system ac bus m is gone back to for jth
The system voltage coupling factor；ZeqjmFor node equivalent impedance matrix ZeqJth row, m column element and jth return direct current system
The mutual impedance of system inverter side change of current bus and receiving-end system ac bus m；ZeqmmFor node equivalent impedance matrix ZeqM row,
The self-impedance of m column element and receiving-end system ac bus m；J >=1, m >=1.
Step S102 is obtained and is simplified the critical ac and dc systems voltage coupling factor.
The calculation formula of the critical ac and dc systems voltage coupling factor is,
Wherein, CADVCFjmThe critical friendship of direct current system inverter side change of current bus and receiving-end system ac bus m is returned for jth
The direct current system voltage coupling factor, XKj% is the short-circuit reactance percentage that jth returns converter power transformer in direct current system Inverter Station
Than γminFor valve intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；
IdjAnd IdjNThe respectively running current and specified running current of jth time direct current system；ULj0The line of direct current system j inverter side change of current bus before breaking down for the receiving-end system ac bus m
Voltage, ULjNFor the rated value of the line voltage；ULm0It is broken down for the receiving-end system ac bus m
Preceding line voltage, ULmNFor the rated value of the line voltage；
The essence of commutation failure is that inverter blow-out angle γ is less than valve intrinsic limit blow-out angle γmin, it is that converter valve is completed to carry
Stream is compound, restores shutdown angle corresponding to the time of blocking ability；Converter valve is made of Thyristors in series, at present thyristor valve
Go free recovery time in 400 μ s (about 7 ° of electrical angles) left and right, in conjunction with the requirement of practical engineering calculation, take γmin=7 °.
Jth returns the calculation formula of direct-flow inverter angle of overlap are as follows:
In formula, γjThe blow-out angle of DC inversion station is gone back to for jth；XrjThe commutating reactance of DC inversion station is returned for jth；UjFor
Jth returns DC inversion station converter transformer valve-side floating voltage.
In formula, njThe no-load voltage ratio of the converter power transformer of DC inversion station is returned for jth.
In formula, ULjThe change of current busbar voltage of DC inversion station is returned for jth.
Formula (4) and formula (5) substitute into formula (3), have:
Due to αj=π-(μj+γj), then have
Substitution formula (2), has
Have when receiving end AC system normal operation and direct current system rated power operation, ULj0 *≈ 1, ULm0 *≈ 1, Idj *=1,
γjIt 17 ° of ≈, substitutes into formula (8), is simplified the critical ac and dc systems voltage coupling factor,
Simplify the critical ac and dc systems voltage coupling factor (SCADVCFj) only device parameter (X with direct current jKj%)
It is related, it is unrelated with the operating parameter of receiving end ac bus m.In this way, in more feed-in ac and dc systems, the same direct current system pair
In different receiving end AC system buses, the critical ac and dc systems voltage coupling factor of simplification having the same is significantly simple
Calculation amount is changed, has not needed again every time receiving-end system ac bus calculate to solve critical value.
Step S103 according to the ac and dc systems voltage coupling factor and simplifies critical ac and dc systems voltage coupling
Cooperation is assessed with the risk that commutation failure occurs for factor pair Multi-infeed HVDC transmission system.
If ADVCFjm≥SCADVCFj, then jth is returned after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
There are the risks of commutation failure for direct current system；
If ADVCFjm< SCADVCFj, then jth is returned after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
The risk of commutation failure is not present in direct current system.
With a two feed-in alternating current-direct current example systems, the present invention is described in further detail below, but the present invention is unlimited
In given example.The equivalent circuit of the two feed-ins alternating current-direct current example system is as shown in Fig. 2, the use of direct current system rectification side is fixed
Current control, inverter side, which uses, determines gamma kick.Direct current system uses quasi steady state model, parameter are as follows: direct current rated power Pd1N
=Pd2N=3000MW, DC rated voltage Ud1N=Ud2N=500kV, DC rated current IdN1=IdN2=3kA, inverter side are changed
Flow bus voltage rating UL1N=UL2N=525kV, converter power transformer short-circuit impedance percentage XK1%=XK2%=16.8%.
Three-phase metallic short circuit failure occurs using method rapid evaluation receiving-end system ac bus provided by the invention to lead
Cause multi-infeed HVDC system that the risk of commutation failure occurs, steps are as follows:
Step 1: determining Multi-infeed HVDC transmission system and receiving end AC system to be studied: direct current 1 and direct current 2 are constituted
Two infeed HVDC Systems, bus 3, bus 4,Z13、Z24、Z34、Z1And Z2Receiving end AC system is constituted, at the beginning of system
Beginning operating parameter are as follows: DC current Id10=Id20=3kA, dc power Pd10=Pd20=3000MW, blow-out angle γ10=γ20=
16.8 °, delayed trigger angle α10=α20=142.2 °, Inverter Station change of current bus line voltage UL10=UL20=521kV, receiving end exchange
System busbar line voltage UL30=UL40=519.5kV.
Step 2: calculating the ac and dc systems voltage coupling between Multi-infeed HVDC transmission system and receiving end AC system
The factor are as follows:
Step 3: simplifying the calculation formula of the critical ac and dc systems voltage coupling factor are as follows:
By XK1%=XK2%=16.8% is substituted into above formula, is obtained: SCADVCF1=SCADVCF2=0.18
Step 4: due to ADVCF13>SCADVCF1, ADVCF23> SCADVCF2, it is believed that it is sent out at receiving-end system ac bus 3
Raw three-phase metallic short circuit failure, commutation failure can occur simultaneously for direct current system 1 and direct current system 2.
Similarly, ADVCF14>SCADVCF1, ADVCF24> SCADVCF2, it is believed that three-phase occurs at receiving-end system ac bus 4
After metallic short circuit failure, commutation failure can occur simultaneously for direct current system 1 and direct current system 2.
Simulating, verifying is carried out below: three-phase metallicity instantaneous short-circuit failure, failure are set at receiving-end system ac bus 3
The generation moment is t=0.5s, and trouble duration 0.1s, simulation result is as in Figure 3-5, it can be seen from the figure that receiving end system
When three phase short circuit fault occurs at system ac bus 3, commutation failure occurs simultaneously for direct current 1 and direct current 2.
Simplify the critical ac and dc systems voltage coupling factor (SCADVCF simulation results show mentioningj) index
Correctness and validity.
It is corresponding with a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure provided by the invention, this
Invention provides a kind of risk evaluating system of Multi-infeed HVDC transmission system commutation failure, comprising:
The coupling of ac and dc systems voltage is handed over because of sub-acquisition module for obtaining Multi-infeed HVDC transmission system and receiving end
The ac and dc systems voltage coupling factor between streaming system；
Simplify acting factor and obtain module, simplifies the critical ac and dc systems voltage coupling factor for obtaining；
Risk evaluation module, for according to the ac and dc systems voltage coupling factor and simplified critical alternating current-direct current system
The risk that commutation failure occurs for system voltage coupling factor pair Multi-infeed HVDC transmission system is assessed.
The present invention provides a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure, simplifies critical alternating current-direct current
System voltage coupling level of factor.The same direct current system is having the same for different receiving end AC system buses
Simplify the critical ac and dc systems voltage coupling factor.Lead to multi-infeed HVDC system in rapid evaluation receiving-end system AC fault
System simultaneously commutation failure risk when, do not need to carry out every time receiving-end system ac bus to calculate and solve critical value, solve by
End system scale is big, and many and diverse problem is calculated caused by ac bus Numerous.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skills in the art should understand that still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equally replace, is intended to be within the scope of the claims of the invention.
Claims (5)
1. a kind of methods of risk assessment of Multi-infeed HVDC transmission system commutation failure characterized by comprising
Obtain the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system；
It obtains and simplifies the critical ac and dc systems voltage coupling factor；
According to the ac and dc systems voltage coupling factor and simplify critical ac and dc systems voltage coupling factor pair
The risk that commutation failure occurs for Multi-infeed HVDC transmission system is assessed.
2. the method according to claim 1, wherein the acquisition Multi-infeed HVDC transmission system is exchanged with receiving end
The ac and dc systems voltage coupling factor between system, comprising:
The receiving end AC system node admittance matrix Y of node referenced to ground is established, then calculate node impedance matrix Z,
Z=Y-1
It is set with the n receiving end AC system bus for needing to pay close attention to, it is corresponding that n node is found out from the nodal impedance matrix Z
Self-impedance and mutual impedance, formed node equivalent impedance Zeq；
The calculation formula of the ac and dc systems voltage coupling factor between Multi-infeed HVDC transmission system and receiving end AC system
For,
Wherein, ADVCFjmThe ac and dc systems between direct current system inverter side change of current bus and receiving-end system ac bus m are returned for jth
The voltage coupling factor；ZeqjmFor node equivalent impedance matrix ZeqJth row, m column element and jth return direct current system
The mutual impedance of inverter side change of current bus and receiving-end system ac bus m；ZeqmmFor node equivalent impedance matrix ZeqM row, m
The self-impedance of column element and receiving-end system ac bus m；J >=1, m >=1.
3. making the method according to claim 1, wherein the acquisition simplifies critical ac and dc systems voltage coupling
With the factor, including；
The calculation formula of the critical ac and dc systems voltage coupling factor is,
Wherein, CADVCFjmThe critical alternating current-direct current of direct current system inverter side change of current bus and receiving-end system ac bus m is returned for jth
The system voltage coupling factor, XKj% is the short-circuit reactance percentage that jth returns converter power transformer in direct current system Inverter Station,
γminFor valve intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；
IdjAnd IdjNThe respectively running current and specified running current of jth time direct current system；
ULj0The line voltage of direct current system j inverter side change of current bus, U before breaking down for the receiving-end system ac bus mLjNFor institute
State the rated value of line voltage；ULm0Line voltage before breaking down for the receiving-end system ac bus m,
ULmNFor the rated value of the line voltage；
γminIt is that converter valve is completed Carrier recombination, restored corresponding to the time of blocking ability for valve intrinsic limit blow-out angle
Turn off angle；
Have when receiving end AC system normal operation and direct current system rated power operation, ULj0 *≈ 1, ULm0 *≈ 1, Idj *=1, γj
17 ° of ≈, it is simplified the critical ac and dc systems voltage coupling factor,
Simplify the critical ac and dc systems voltage coupling factor (SCADVCFj) only device parameter (X with direct current jKj%) have
It closes, it is unrelated with the operating parameter of receiving end ac bus m.
4. the method according to claim 1, wherein it is described according to the ac and dc systems voltage coupling because
Son and the risk for simplifying critical ac and dc systems voltage coupling factor pair Multi-infeed HVDC transmission system generation commutation failure
It is assessed, comprising:
If ADVCFjm≥SCADVCFj, then jth returns direct current after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
There are the risks of commutation failure for system；
If ADVCFjm< SCADVCFj, then jth returns direct current after three-phase metallic short circuit failure occurs at receiving-end system ac bus m
The risk of commutation failure is not present in system.
5. a kind of risk evaluating system of Multi-infeed HVDC transmission system commutation failure characterized by comprising
The coupling of ac and dc systems voltage exchanges system with receiving end because of sub-acquisition module, for obtaining Multi-infeed HVDC transmission system
The ac and dc systems voltage coupling factor between system；
Simplify acting factor and obtain module, simplifies the critical ac and dc systems voltage coupling factor for obtaining；
Risk evaluation module, for according to the ac and dc systems voltage coupling factor and simplified critical ac and dc systems electricity
The risk that commutation failure occurs for pressure coupling factor pair Multi-infeed HVDC transmission system is assessed.
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| CN112132307A (en) * | 2020-07-02 | 2020-12-25 | 国网上海能源互联网研究院有限公司 | Method and device for determining optimal value of reactive reserve capacity of generator |
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