CN106786716B - Method and device for calculating mutual influence degree between direct currents - Google Patents
Method and device for calculating mutual influence degree between direct currents Download PDFInfo
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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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The embodiment of the invention provides a method and a device for calculating the mutual influence degree between direct currents, relates to the technical field of high-voltage direct-current power transmission, and can take the influence of flexible direct current on conventional direct current into account. The specific scheme comprises the following steps: acquiring a target parameter; according to the target parameters, calculating by using a first formula to obtain a conventional direct current multi-feed-in short circuit ratio MISCRIVH containing flexible direct current; the first formula is:the method is used for calculating the degree of mutual influence between the direct currents in the multiple direct current feed-in systems comprising the flexible direct current and the conventional direct current.
Description
Technical field
The embodiment of the present invention is related to mutual shadow between technical field of HVDC transmission more particularly to a kind of calculating direct current
The method and device of the degree of sound.
Background technique
In multi-infeed DC system, for Mr. Yu returns direct current, the operation characteristic of other converter stations, power delivery capacity
And this direct current system can all be produced bigger effect with the electrical couplings distance of this converter station, it cannot be ignored, especially have
Multiple converter station close-coupleds and power conveys larger situation, influence degree is more prominent.How multi-infeed DC system is measured
Influencing each other between each time direct current in system has important directive significance in systems organization and operation.
Due to only including customary DC in previous multi-infeed DC system, thus each time direct current of existing calculating is mutual
The index of influence degree also only considers the case where feed-in direct current is only customary DC.However, with flexible direct current technology increasingly at
Ripe, the flexible direct current of large capacity voltage levels is more and more applied in power transmission network, and multi-infeed DC system is not only
It further include flexible direct current including customary DC.Flexible direct current can be realized active and idle decoupling control, when receiving-end system occurs
When serious AC fault, flexible direct current can persistently provide a certain amount of dynamic reactive support to AC system, and influence cannot
Ignore.And the interactional index between each time direct current is measured defined in the prior art, it is not intended that containing in feed-in direct current
The case where flexible direct current, thus lack accuracy.
Summary of the invention
The embodiment of the present invention provides a kind of method and device for calculating the degree that influences each other between direct current, and meter and flexibility are straight
Flow the influence to customary DC.In order to achieve the above objectives, embodiments herein adopts the following technical scheme that
In a first aspect, provide a kind of method of degree of influencing each other between calculating direct current, be applied to comprising flexible direct current and
The multi-infeed DC system of customary DC, this method specifically include:
Obtain target component；The target component includes: three-phase shortcircuit appearance at customary DC system converter station i change of current bus
Measure Saci, the rated capacity P of customary DC system idNi, the rated capacity P of customary DC system jdNj, when converter station i change of current bus
There are when reactive disturbance, other DC converter busbar voltages decline Δ UjDecline Δ U with this time DC converter busbar voltagei；It is flexible
The rated capacity P of direct current system mdVH_Nm, the maximum output dynamic reactive Q of flexible direct current system m designdVH_Nm, and it is conventional straight
The more feed-in interaction factors As of stream-flexible direct current；Wherein, A is used to indicate influence journey of the flexible direct current reactive power to customary DC
Degree；
According to the target component, the more feed-in short circuits of the customary DC containing flexible direct current are calculated using the first formula
Compare MISCRIVH；First formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number.
Second aspect provides the method for calculating the degree that influences each other between direct current in another multi-infeed DC system, answers
To contain the multi-infeed DC system of flexible direct current and customary DC, this method is specifically included:
Obtain calculating parameter；The calculating parameter includes: three-phase shortcircuit appearance at customary DC system converter station i change of current bus
Measure Saci, when customary DC system converter station i ac bus voltage is rated value, dc power is rated value, converter station exchange filter
The three-phase fundamental frequency reactive power Q that wave device and shunt capacitor provideCNi；The rated capacity P of customary DC system idNi, customary DC
The rated capacity P of system jdNj, when converter station i change of current bus is there are when reactive disturbance, other DC converter busbar voltages decline Δ
UjDecline Δ U with this time DC converter busbar voltagei；The rated capacity P of flexible direct current system mdVH_Nm, flexible direct current system m sets
The maximum output dynamic reactive Q of meterdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current；Wherein, A is used to indicate
Influence degree of the flexible direct current reactive power to customary DC；
According to the calculating parameter, it is effective that the more feed-ins of the customary DC containing flexible direct current are calculated using the second formula
Short-circuit ratio MIESCRIVH；Second formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number.
The third aspect provides a kind of device for calculating the degree that influences each other between direct current, is mentioned for executing first aspect
The method of confession.
Fourth aspect provides a kind of device for calculating the degree that influences each other between direct current, is mentioned for executing second aspect
The method of confession.
Mutual shadow between direct current is calculated in multi-infeed DC system containing flexible direct current provided by the embodiment of the present invention
The method and device of the degree of sound, giving can effectively measure after flexible direct current and customary DC are contacted by AC system each time
Between direct current interact and influence index, i.e. the more feed-in short-circuit ratio MISCRIVH of the customary DC containing flexible direct current and
The more feed-in short-circuit ratio MISCRIVH of customary DC containing flexible direct current.This two indexs consider flexible direct current to conventional straight
The influence of stream calculates simply, can be adjusted according to the degree of strength of the control characteristic of flexible direct current, operating condition and AC system
Flexible direct current influences conversion factor, has preferable flexibility, can be used for systems organization and operation instruction, such as the association of more direct currents
It adjusts and restores control etc..
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is a kind of method flow signal for calculating the degree that influences each other between direct current provided by the embodiment of the present invention
Figure；
Fig. 2 is a kind of apparatus structure signal for calculating the degree that influences each other between direct current provided by the embodiment of the present invention
Figure；
Fig. 3 shows for the method flow that another kind provided by the embodiment of the present invention calculates the degree that influences each other between direct current
It is intended to；
Fig. 4 shows for the apparatus structure that another kind provided by the embodiment of the present invention calculates the degree that influences each other between direct current
It is intended to.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the prior art, consider that more times customary DCs there are more feed-ins by the index of interaction and the influence of AC network
Short-circuit ratio (full name in English: Multi-Infeed Short Circuit Ratio, English abbreviation: MISCR) and more feed-ins are effective
Short-circuit ratio (full name in English: Multi-Infeed Effective Short Circuit Ratio, English abbreviation: MIESCR).
For direct current system i, more feed-in short-circuit ratio MISCRiIs defined as:
If considering the influence of parallel reactive compensation on the change of current bus of corresponding direct current, more effective short-circuit ratioes of feed-in are fixed
Justice are as follows: MIESCRi:
In formula (1) and (2), SaciFor three-phase shortcircuit capacity at converter station i change of current bus；PdNiAnd PdNjFor direct current system i, j
Rated capacity；QCNiFor when converter station i ac bus voltage is rated value, dc power is rated value, converter station exchange is filtered
The three-phase fundamental frequency reactive power that wave device and shunt capacitor provide；ΔUj/ΔUiFor more feed-ins interaction factor, indicate due to idle
Disturb Δ Qi, the rate of descent Δ U of other DC converter busbar voltagesjDecline Δ U with this time DC converter busbar voltageiRatio.
ΔUj/ΔUiIt can be found out, can also be acquired according to following calculation method by transient emulation approximation:
If carrying out P-Q decoupling to AC system are as follows:
Δ U=JQU -1ΔQ (4)
If Δ QjIt changes, Δ Qi=0 (i=1 ... n, i ≠ j), then
Z in formula (5)eqijIndicate the i row j column element of the AC system nodal impedance matrix entered in terms of direct current system bus.
In general, MIESCRiThe system of < 2.5 is known as weak pattern system；MIESCRi>=2.5 system is known as strong system.
However, the flexible direct current of large capacity voltage levels obtains in power transmission network as flexible direct current technology is increasingly mature
To more and more applications.More feed-in short-circuit ratioes in the prior art and the effective short-circuit ratio of more feed-ins only consider feed-in direct current only
The case where being only customary DC, there is no consider the case where containing flexible direct current in feed-in direct current.On the other hand, flexible direct current energy
Enough realize active and idle decoupling control, when serious AC fault occurs for receiving-end system, flexible direct current can give AC system
A certain amount of dynamic reactive support is persistently provided, influence cannot be ignored.Therefore, how effectively to measure containing flexible direct current and often
It advises in the system of the multi-infeed DC of direct current the interaction of each time direct current and influences very necessary, have great importance.This
The purpose of application is to propose in the multi-infeed DC system comprising flexible direct current and customary DC, measures the phase of each time direct current
Interaction and influence index, are respectively as follows:
Customary DC containing flexible direct current more feed-in short-circuit ratioes (full name in English: Multi-Infeed Short
Circuit Ratio Including VSC-HVDC, English abbreviation: MISCRIVH), and it is conventional straight containing flexible direct current
Flow the effective short-circuit ratio of more feed-ins (full name in English: Multi-Infeed Effective Short Circuit Ratio
Including VSC-HVDC, English abbreviation: MIESCRIVH).It is illustrated below in conjunction with embodiments herein.
Embodiment
The embodiment of the present invention provides a kind of method that the degree that influences each other between direct current is calculated in multi-infeed DC system,
Applied to the multi-infeed DC system comprising flexible direct current and customary DC, as shown in connection with fig. 1, comprising the following steps:
101, target component is obtained.
Target component includes: three-phase shortcircuit capacity S at customary DC system converter station i change of current busaci, customary DC system
The rated capacity P of system idNi, the rated capacity P of customary DC system jdNj, when converter station i change of current bus is there are when reactive disturbance,
Other DC converter busbar voltages decline Δ UjDecline Δ U with this time DC converter busbar voltagei；Flexible direct current system m's is specified
Capacity PdVH_Nm, the maximum output dynamic reactive Q of flexible direct current system m designdVH_NmAnd customary DC-flexible direct current is presented more
Enter interactive factors A.Wherein, A is used to indicate flexible direct current reactive power to the influence degree of customary DC.
102, according to target component, the more feed-in short circuits of the customary DC containing flexible direct current are calculated using the first formula
Compare MISCRIVH.
First formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number, k take positive number.The specific value of k can according to the degree of strength of the control characteristic of flexible direct current, operating condition and AC system into
Row optimization determines.When the value of k is larger, the result being calculated represents flexible direct current and is affected to customary DC i, k's
When value is smaller, it is smaller that the result being calculated represents influence of the flexible direct current to customary DC i.
Optionally, in a kind of specific embodiment, in the first formula customary DC-flexible direct current more feed-ins interaction because
Sub- A=Δ Ui/ΔUm.Wherein, Δ UiWith Δ UmThe change of current bus of respectively flexible direct current system m injects reactive power Δ QmWhen,
The change of current busbar voltage decline of customary DC i and the change of current busbar voltage of flexible direct current m rise.ΔUi/ΔUmCalculation method with
ΔUj/ΔUiCalculation method it is consistent, details are not described herein again.By A=Δ Ui/ΔUmThe first formula is substituted into, is obtained:
Optionally, calculated result is exported to user, or can also export to other equipment there are other equipment to do into one
Step processing.
The embodiment of the present invention also provides a kind of device for calculating the degree that influences each other between direct current, for executing Fig. 1 pairs
Method described in the embodiment answered.As shown in connection with fig. 2, which includes:
Input unit 201, for obtaining target component.Target component includes: three at customary DC converter station i change of current bus
Phase capacity of short circuit Saci, the rated capacity P of customary DC system idNi, the rated capacity P of customary DC system jdNj, as converter station i
For change of current bus there are when reactive disturbance, other DC converter busbar voltages decline Δ UjDecline with this time DC converter busbar voltage
ΔUi；The rated capacity P of flexible direct current system mdVH_Nm, the maximum output dynamic reactive Q of flexible direct current system m designdVH_Nm, with
And the more feed-in interaction factors As of customary DC-flexible direct current.Wherein, A is used to indicate flexible direct current reactive power to customary DC
Influence degree.
Computing unit 202, the target component for being obtained according to input unit 201, is calculated using the first formula and is contained
The more feed-in short-circuit ratio MISCRIVH of the customary DC of flexible direct current.First formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number.
Optionally, in a kind of specific embodiment, in the first formula customary DC-flexible direct current more feed-ins interaction because
Sub- A=Δ Ui/ΔUm.Wherein, Δ UiWith Δ UmIt is conventional when the change of current bus of respectively flexible direct current system m injects reactive power
The change of current busbar voltage decline of direct current i and the change of current busbar voltage of flexible direct current m rise.
Optionally, which can also include output unit 203, calculate for (to user or other equipment) output single
The calculated result that member 202 obtains.
The embodiment of the present invention also provides in another multi-infeed DC system and calculates the degree that influences each other between direct current
Method, applied to the multi-infeed DC system comprising flexible direct current and customary DC, as shown in connection with fig. 3, this method includes following
Step:
301, calculating parameter is obtained.
Calculating parameter includes: three-phase shortcircuit capacity S at customary DC system converter station i change of current busaci, customary DC system
When converter station i ac bus voltage of uniting is rated value, dc power is rated value, converter station alternating current filter and shunt capacitor
The three-phase fundamental frequency reactive power Q of offerCNi.The rated capacity P of customary DC system idNi, the rated capacity of customary DC system j
PdNj, when converter station i change of current bus is there are when reactive disturbance, other DC converter busbar voltages decline Δ UjIt is changed with this time direct current
It flows busbar voltage and declines Δ Ui；The rated capacity P of flexible direct current system mdVH_Nm, the maximum output of flexible direct current system m design is dynamic
State is idle QdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current.Wherein, A is used to indicate the idle function of flexible direct current
Influence degree of the rate to customary DC.
302, according to calculating parameter, it is effective that the more feed-ins of the customary DC containing flexible direct current are calculated using the second formula
Short-circuit ratio MIESCRIVH.
Second formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number.K takes positive number.The specific value of k can according to the degree of strength of the control characteristic of flexible direct current, operating condition and AC system into
Row optimization determines.When the value of k is larger, the result being calculated represents flexible direct current and is affected to customary DC i, k's
When value is smaller, it is smaller that the result being calculated represents influence of the flexible direct current to customary DC i.
Optionally, in a kind of specific embodiment, in the second formula customary DC-flexible direct current more feed-ins interaction because
Sub- A=Δ Ui/ΔUm.Wherein, Δ UiWith Δ UmIt is conventional when the change of current bus of respectively flexible direct current system m injects reactive power
The change of current busbar voltage decline of direct current i and the change of current busbar voltage of flexible direct current m rise.ΔUi/ΔUmCalculation method and Δ
Uj/ΔUiCalculation method it is consistent, details are not described herein again.By A=Δ Ui/ΔUmThe second formula is substituted into, is obtained:
Optionally, calculated result is exported to user, or can also export to other equipment there are other equipment to do into one
Step processing.
The embodiment of the present invention also provides a kind of device for calculating the degree that influences each other between direct current, for executing Fig. 3 pairs
Method described in the embodiment answered.As shown in connection with fig. 4, which includes:
Input unit 401, for obtaining calculating parameter.Calculating parameter includes: customary DC system converter station i change of current bus
Locate three-phase shortcircuit capacity Saci, when customary DC system converter station i ac bus voltage is rated value, dc power is rated value,
The three-phase fundamental frequency reactive power Q that converter station alternating current filter and shunt capacitor provideCNi.The rated capacity of customary DC system i
PdNi, the rated capacity P of customary DC system jdNj, when converter station i change of current bus is there are when reactive disturbance, other DC converters are female
Line voltage declines Δ UjDecline Δ U with this time DC converter busbar voltagei；The rated capacity P of flexible direct current system mdVH_Nm, flexible
The maximum output dynamic reactive Q of direct current system m designdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current.Its
In, A is used to indicate flexible direct current reactive power to the influence degree of customary DC.
Computing unit 402, the calculating parameter for being obtained according to input unit 401, is calculated using the second formula and is contained
The effective short-circuit ratio MIESCRIVH of the more feed-ins of the customary DC of flexible direct current.Second formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion system
Number.
Optionally, in a kind of specific embodiment, in the second formula customary DC-flexible direct current more feed-ins interaction because
Sub- A=Δ Ui/ΔUm.Wherein, Δ UiWith Δ UmIt is conventional when the change of current bus of respectively flexible direct current system m injects reactive power
The change of current busbar voltage decline of direct current i and the change of current busbar voltage of flexible direct current m rise.
Optionally, which can also include output unit 403, for exporting computing unit to user or other equipment
402 obtained calculated results.
Mutual shadow between direct current is calculated in multi-infeed DC system containing flexible direct current provided by the embodiment of the present invention
The method and device of the degree of sound, giving can effectively measure after flexible direct current and customary DC are contacted by AC system each time
Between direct current interact and influence index, i.e. the more feed-in short-circuit ratio MISCRIVH of the customary DC containing flexible direct current and
The more feed-in short-circuit ratio MISCRIVH of customary DC containing flexible direct current.This two indexs consider flexible direct current to conventional straight
The influence of stream calculates simply, can be adjusted according to the degree of strength of the control characteristic of flexible direct current, operating condition and AC system
Flexible direct current influences conversion factor, has preferable flexibility, can be used for systems organization and operation instruction, such as the association of more direct currents
It adjusts and restores control etc..
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (4)
1. a kind of method for calculating the degree that influences each other between direct current, applied to more direct currents comprising flexible direct current and customary DC
Feedthrough system characterized by comprising
Obtain target component；The target component includes: three-phase shortcircuit capacity at customary DC system converter station i change of current bus
Saci, the rated capacity P of customary DC system idNi, the rated capacity P of customary DC system jdNj, when converter station i change of current bus is deposited
In reactive disturbance, other DC converter busbar voltages decline Δ UjDecline Δ U with this time DC converter busbar voltagei；It is flexible straight
The rated capacity P of streaming system mdVH_Nm, the maximum output dynamic reactive Q of flexible direct current system m designdVH_NmAnd customary DC-
The more feed-in interaction factors As of flexible direct current；Wherein, A is used to indicate flexible direct current reactive power to the influence degree of customary DC；
According to the target component, the more feed-in short-circuit ratioes of the customary DC containing flexible direct current are calculated using the first formula
MISCRIVH；First formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion factor；
The more feed-in interaction factors A=Δ U of customary DC-flexible direct current in first formulai/ΔUm；Wherein, Δ UiWith Δ UmPoint
Not Wei flexible direct current system m change of current bus inject reactive power when, customary DC i the change of current busbar voltage decline and flexibility it is straight
The change of current busbar voltage for flowing m rises.
2. a kind of method for calculating the degree that influences each other between direct current, applied to more direct currents comprising flexible direct current and customary DC
Feedthrough system characterized by comprising
Obtain calculating parameter；The calculating parameter includes: three-phase shortcircuit capacity at customary DC system converter station i change of current bus
Saci, when customary DC system converter station i ac bus voltage is rated value, dc power is rated value, converter station ac filter
The three-phase fundamental frequency reactive power Q that device and shunt capacitor provideCNi；The rated capacity P of customary DC system idNi, customary DC system
The rated capacity P of system jdNj, when converter station i change of current bus is there are when reactive disturbance, other DC converter busbar voltages decline Δ Uj
Decline Δ U with this time DC converter busbar voltagei；The rated capacity P of flexible direct current system mdVH_Nm, flexible direct current system m design
Maximum output dynamic reactive QdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current；Wherein, A is used to indicate soft
Influence degree of the property direct current reactive power to customary DC；
According to the calculating parameter, it is effectively short-circuit that the more feed-ins of the customary DC containing flexible direct current are calculated using the second formula
Compare MIESCRIVH；Second formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion factor；
The more feed-in interaction factors A=Δ U of customary DC-flexible direct current in second formulai/ΔUm；Wherein, Δ UiWith Δ UmPoint
Not Wei flexible direct current system m change of current bus inject reactive power when, customary DC i the change of current busbar voltage decline and flexibility it is straight
The change of current busbar voltage for flowing m rises.
3. a kind of device for calculating the degree that influences each other between direct current characterized by comprising
Input unit, for obtaining target component；The target component includes: at customary DC system converter station i change of current bus
Three-phase shortcircuit capacity Saci, the rated capacity P of customary DC system idNi, the rated capacity P of customary DC system jdNj, work as the change of current
I change of current bus stand there are when reactive disturbance, other DC converter busbar voltages decline Δ UjWith this time DC converter busbar voltage
Decline Δ Ui；The rated capacity P of flexible direct current system mdVH_Nm, the maximum output dynamic reactive of flexible direct current system m design
QdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current；Wherein, A is used to indicate flexible direct current reactive power to normal
Advise the influence degree of direct current；
Computing unit, the target component for being obtained according to the input unit, using the first formula be calculated containing
The more feed-in short-circuit ratio MISCRIVH of the customary DC of flexible direct current；First formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion factor；
The more feed-in interaction factors A=Δ U of customary DC-flexible direct current in first formulai/ΔUm；Wherein, Δ UiWith Δ UmPoint
Not Wei flexible direct current system m change of current bus inject reactive power when, customary DC i the change of current busbar voltage decline and flexibility it is straight
The change of current busbar voltage for flowing m rises.
4. a kind of device for calculating the degree that influences each other between direct current characterized by comprising
Input unit, for obtaining calculating parameter；The calculating parameter includes: at customary DC system converter station i change of current bus
Three-phase shortcircuit capacity Saci, when customary DC system converter station i ac bus voltage is rated value, dc power is rated value, change
The three-phase fundamental frequency reactive power Q that stream station alternating current filter and shunt capacitor provideCNi；The rated capacity of customary DC system i
PdNi, the rated capacity P of customary DC system jdNj, when converter station i change of current bus is there are when reactive disturbance, other DC converters are female
Line voltage declines Δ UjDecline Δ U with this time DC converter busbar voltagei；The rated capacity P of flexible direct current system mdVH_Nm, flexible
The maximum output dynamic reactive Q of direct current system m designdVH_NmAnd the more feed-in interaction factors As of customary DC-flexible direct current；Its
In, A is used to indicate flexible direct current reactive power to the influence degree of customary DC；
Computing unit, the calculating parameter for being obtained according to the input unit, using the second formula be calculated containing
The effective short-circuit ratio MIESCRIVH of the more feed-ins of the customary DC of flexible direct current；Second formula are as follows:
Wherein, LH_S is customary DC set, and VH_S is flexible direct current set, and constant k is that flexible direct current influences conversion factor；
The more feed-in interaction factors A=Δ U of customary DC-flexible direct current in second formulai/ΔUm；Wherein, Δ UiWith Δ UmPoint
Not Wei flexible direct current system m change of current bus inject reactive power when, customary DC i the change of current busbar voltage decline and flexibility it is straight
The change of current busbar voltage for flowing m rises.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129112.2A CN106786716B (en) | 2016-12-09 | 2016-12-09 | Method and device for calculating mutual influence degree between direct currents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129112.2A CN106786716B (en) | 2016-12-09 | 2016-12-09 | Method and device for calculating mutual influence degree between direct currents |
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| CN109217302B (en) * | 2018-10-11 | 2019-11-19 | 清华大学 | The evaluation method of Traditional DC receiving end grid strength in a kind of mixing multi-infeed systems |
| CN109617110B (en) * | 2018-12-12 | 2022-05-31 | 南瑞集团有限公司 | Method for evaluating influence of direct current commutation failure and restart on voltage of near-region flexible direct current converter station |
| CN111488677B (en) * | 2020-03-24 | 2021-12-14 | 广东电网有限责任公司电力调度控制中心 | Multi-feed-in effective short-circuit ratio analysis method and device, terminal equipment and storage medium |
| CN112531762B (en) * | 2020-12-04 | 2022-09-06 | 国网河南省电力公司电力科学研究院 | Method for evaluating stability of receiving end voltage of simultaneous-transmission and simultaneous-receiving ultrahigh voltage direct current transmission system |
| CN114050594B (en) * | 2021-11-04 | 2024-03-19 | 深圳供电局有限公司 | Method and system for obtaining short-circuit ratio of conventional direct-current converter bus |
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