CN110504707A - Method and device for evaluating voltage transient stability level of multi-direct-current feed-in power grid - Google Patents
Method and device for evaluating voltage transient stability level of multi-direct-current feed-in power grid Download PDFInfo
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Abstract
The invention discloses a method for evaluating voltage transient stability of a multi-direct-current feed-in power grid, which comprises the following steps of: counting fault types of a multi-direct-current feed-in power grid according to historical data, and calculating corresponding fault weight values; after a fault is recorded, voltage change curves of all direct current inversion side alternating current buses in the multi-direct current feed-in power grid are recorded; calculating the running power weight value of each direct current line; determining a low voltage threshold value of a direct current inversion side alternating current bus corresponding to each direct current line; and calculating an index for measuring the voltage transient stability level of the multi-direct-current feed-in power grid according to the total number of fault types of the multi-direct-current feed-in power grid, the corresponding weight value of each fault type and the voltage change curve. The invention discloses a method for evaluating the voltage transient stability level of a multi-direct-current feed-in power grid, which can be used for measuring the voltage transient stability level of the multi-direct-current feed-in power grid by combining various fault types. The invention also discloses an evaluation device and a storage medium for the voltage transient stability level of the multi-direct-current feed-in power grid.
Description
Technical field
The present invention relates to multi-infeed DC electric power network technique fields more particularly to a kind of multi-infeed DC network voltage temporarily to become steady
Fixed horizontal appraisal procedure and device.
Background technique
With China " transferring electricity from the west to the east " implementation, the multiple power grids in China and area have formd multiple-circuit line feed-in
AC and DC hybrid power system.As the feed-in receiving end power grid direct current quantity of planning increases, caused by alternating current-direct current influences each other
Voltage-stabilizing Problems will be protruded more.Engineering is practical show that multi-infeed DC electric network fault occurs after, caused voltage dip
Multiple-circuit line commutation failure may be caused, multiple-circuit line locking may be caused when serious.Transient Voltage Stability problem is to more direct currents
The safe and stable operation of feed-in power grid proposes severe challenge.Therefore, multi-infeed DC network voltage can be measured by studying one kind
Horizontal index is temporarily stabilized, so that quantitative evaluation multi-infeed DC power grid resists the ability of failure, is of great significance.
The commutation failure problem of direct current is most typical problem during multi-infeed DC network voltage temporarily becomes, and is measured
Multi-infeed DC network voltage temporarily stabilizes horizontal deciding factor.In the prior art, direct-current commutation failure commonly differentiates
Method is mainly blow-out angle diagnostic method, and this method is by comparing inverter blow-out angle and the critical extinction angle for causing commutation failure
Between difference judge whether system occurs commutation failure.
The present inventor has found in the practice of the invention, and following technical problem exists in the prior art:
In systems in practice, inverter blow-out angle and the critical extinction angle of commutation failure is caused all to be time-varying；Especially,
The critical extinction angle of commutation failure is caused to need just to can determine that by a large amount of calculating, it is difficult to be applied to assessment real system；Separately
It outside, cannot simply certain transformer substation voltage falls whether situation judges system after single failure for multi-infeed DC power grid
Commutation failure occurs.
Summary of the invention
The embodiment of the present invention provides a kind of multi-infeed DC network voltage and temporarily stabilizes horizontal appraisal procedure, can combine
Various faults type measures multi-infeed DC network voltage and temporarily stabilizes level.
The embodiment of the present invention one provides a kind of multi-infeed DC network voltage and temporarily stabilizes horizontal appraisal procedure, comprising:
The fault type that multi-infeed DC power grid occurs is counted according to historical data, and it is corresponding to calculate each fault type
Fault right weight value；
After being recorded in the multi-infeed DC grid collapses, all DC inversion sides in the multi-infeed DC power grid
The voltage change curve of ac bus；
Calculate the operation power weighting values of every DC line in the multi-infeed DC power grid；
Determine the corresponding DC inversion side ac bus low voltage threshold of DC line described in each item；Wherein, the direct current
Inverter side ac bus low voltage threshold is voltage value when commutation failure occurs for the corresponding DC line；
The fault type sum that is occurred according to the multi-infeed DC power grid, the corresponding weighted value of each fault type and
Voltage change curve calculates measurement multi-infeed DC network voltage and temporarily stabilizes horizontal index；
Horizontal index, which is temporarily stabilized, according to the measurement multi-infeed DC network voltage obtains multi-infeed DC power grid electricity
Pressure temporarily stabilizes level.
As an improvement of the above scheme, described to calculate the corresponding fault right weight value of each fault type, it specifically includes:
If i-th kind of failure frequency of the multi-infeed DC power grid is ni, then its corresponding weighted value λiFollowing formula institute
Show:
In formula, M is the total number of fault type.
As an improvement of the above scheme, the operation power for calculating every DC line in the multi-infeed DC power grid
Weighted value specifically includes:
If μjFor the operation power weighting values of j-th strip DC line, then μ is calculated by following formulaj:
In formula, N is the total number of the DC line.
As an improvement of the above scheme, further includes:
Determine crucial substation and the critical circuits for leading to the multi-infeed DC grid collapses.
As an improvement of the above scheme, described calculate measures the horizontal index that multi-infeed DC network voltage temporarily stabilizes,
It specifically includes:
The multi-infeed DC network voltage, which is calculated, by following formula temporarily stabilizes horizontal index:
In formula, IUFor voltage transient variation maintenance level index, λiFor the corresponding weighted value of i-th kind of fault type, M is failure classes
The total number of type, the sum of corresponding weighted value of fault type are 1；K is the substation to break down and circuit number, and L is to occur
The substation of failure and the total number of route；μjFor the operation power weighting values of j-th strip DC line, N is the total of DC line
Number；Vj,threFor the corresponding DC inversion side ac bus low voltage threshold of j-th strip DC line；Ui,j,kIt (t) is k-th of change
After i-th kind of failure occurs for power station or route, the ac bus voltage value of j-th strip DC line inverter side when t moment；t0For failure
Voltage is lower than V afterwardsj,threAt the time of, Δ t is Ui,j,k(t) it is lower than Vj,threDuration.
The embodiment of the present invention two is corresponding to be provided a kind of multi-infeed DC network voltage and temporarily stabilizes horizontal assessment device,
Include:
Fault type statistic unit, for counting the fault type that multi-infeed DC power grid occurs according to historical data, and
Calculate the corresponding fault right weight value of each fault type；
Voltage change acquisition unit, after being recorded in the multi-infeed DC grid collapses, more direct current feedbacks
Enter the voltage change curve of all DC inversion sides ac bus in power grid；
Power calculation unit is run, for calculating the operation power power of every DC line in the multi-infeed DC power grid
Weight values；
Low voltage threshold determination unit, for determining that the corresponding DC inversion side ac bus of DC line described in each item is low
Voltage threshold；Wherein, the DC inversion side ac bus low voltage threshold is that commutation mistake occurs for the corresponding DC line
Voltage value when losing；
Indicator calculating unit, the fault type sum for being occurred according to the multi-infeed DC power grid, each failure classes
The corresponding weighted value of type and voltage change curve calculate measurement multi-infeed DC network voltage and temporarily stabilize horizontal index；
Maintenance level measures unit, for temporarily stabilizing horizontal index according to the measurement multi-infeed DC network voltage
It obtains multi-infeed DC network voltage and temporarily stabilizes level.
The embodiment of the present invention three is corresponding to be provided a kind of multi-infeed DC network voltage and temporarily stabilizes horizontal assessment device,
Include: processor, memory and storage in the memory and is configured as the computer journey executed by the processor
Sequence, the processor realize a kind of multi-infeed DC power grid as described in the embodiment of the present invention one when executing the computer program
The appraisal procedure of voltage transient variation maintenance level.
The correspondence of the embodiment of the present invention four provides a kind of computer readable storage medium, which is characterized in that the computer
Readable storage medium storing program for executing includes the computer program of storage, wherein controlling the computer in computer program operation can
A kind of multi-infeed DC network voltage that equipment where reading storage medium executes as described in the embodiment of the present invention one temporarily stabilizes water
Flat appraisal procedure.
A kind of multi-infeed DC network voltage provided in an embodiment of the present invention temporarily stabilizes horizontal appraisal procedure, has such as
It is lower the utility model has the advantages that
It can be based on multiple faults type, in conjunction with the weighted value of each fault type in the historical data, synthetically, integrally
It measures multi-infeed DC network voltage and temporarily stabilizes level；The fault type occurred in all historical datas can be chosen, also can
It is enough selectively to choose typical or common fault type, targetedly assessed；By determining crucial substation and pass
Key route targetedly carries out the voltage monitoring after failure, extracts more direct current feedbacks after crucial substation and critical circuits failure
Enter the voltage change curve of all DC inversion sides ac bus in power grid；Finally according to the voltage transient variation of multi-infeed DC power grid
Maintenance level index measures multi-infeed DC network voltage and temporarily stabilizes level, obtains comprehensive, accurate, targeted assessment knot
Fruit.
Detailed description of the invention
Fig. 1 is that a kind of multi-infeed DC network voltage that the embodiment of the present invention one provides temporarily stabilizes horizontal appraisal procedure
Flow diagram.
Fig. 2 is that a kind of multi-infeed DC network voltage that the embodiment of the present invention one provides temporarily stabilizes horizontal appraisal procedure
Calculating schematic diagram.
Fig. 3 is that a kind of multi-infeed DC network voltage provided by Embodiment 2 of the present invention temporarily stabilizes horizontal assessment device
Structural schematic diagram.
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.
It is that a kind of multi-infeed DC network voltage that the embodiment of the present invention one provides temporarily stabilizes horizontal comment referring to Fig. 1
Estimate the flow diagram of method, comprising:
S101, the fault type that multi-infeed DC power grid occurs is counted according to historical data, and calculates each fault type
Corresponding fault right weight value；
S102, after being recorded in the multi-infeed DC grid collapses, all direct currents in the multi-infeed DC power grid
The voltage change curve of inverter side ac bus；
S103, the operation power weighting values for calculating every DC line in the multi-infeed DC power grid；
S104, the corresponding DC inversion side ac bus low voltage threshold of DC line described in each item is determined；Wherein, described
DC inversion side ac bus low voltage threshold is voltage value when commutation failure occurs for the corresponding DC line；
S105, the fault type sum occurred according to the multi-infeed DC power grid, each corresponding weight of fault type
Value and voltage change curve calculate measurement multi-infeed DC network voltage and temporarily stabilize horizontal index；
S106, horizontal index acquisition multi-infeed DC electricity is temporarily stabilized according to the measurement multi-infeed DC network voltage
Net voltage transient variation maintenance level.
Preferably, a kind of multi-infeed DC network voltage that the embodiment of the present invention one provides temporarily stabilizes horizontal assessment side
In method, the fault type that multi-infeed DC power grid occurs is counted according to historical data, which can be all failure classes
Type, the typical fault type being also possible in multi-infeed DC power grid.Typical fault type include single back line it is single-phase, it is alternate,
Three phase short circuit fault, parallel lines on same tower multi circuit transmission lines simultaneously/successive failure, bus be single-phase or multiphase ground connection/short trouble etc..
Further, described to calculate the corresponding fault right weight value of each fault type, it specifically includes:
If i-th kind of failure frequency of the multi-infeed DC power grid is ni, then its corresponding weighted value λiFollowing formula institute
Show:
In formula, M is the total number of fault type.
Further, the operation power weighting values for calculating every DC line in the multi-infeed DC power grid, tool
Body includes:
If μjFor the operation power weighting values of j-th strip DC line, then μ is calculated by following formulaj:
In formula, N is the total number of the DC line.Operation power i.e. before j-th strip DC line fault is divided by all
DC line fault is fed forward the general power of multi-infeed DC power grid.
Further, further includes:
Determine crucial substation and the critical circuits for leading to the multi-infeed DC grid collapses.
Preferably, substation and route are the key elements of electrical grid transmission load, after route or substation break down,
It may cause network voltage decline.But different types of failure, the influence to network voltage occur for different routes or substation
Degree is different.Therefore, (such as method can be determined according to management and running experience or complex network key node according to certain rule
Deng), filter out a certain number of multi-infeed DC power grid key substations；It can also be according to certain rule (such as according to scheduling
Operating experience or complex network critical circuits determine method etc.), filter out a certain number of multi-infeed DC power grid critical circuits.
Preferably, for step S102, after being recorded in the multi-infeed DC grid collapses, the multi-infeed DC
The voltage change curve of all DC inversion sides ac bus in power grid may include:
After a variety of typical faults occur in crucial substation, the voltage of all DC inversion sides ac bus is recorded at any time
Between change curve；After a variety of typical faults occur on critical circuits, record the voltage of all DC inversion sides ac bus with
Time changing curve.
Preferably, for step S104, when the Voltage Drop of DC inversion side ac bus is to threshold value hereinafter, the direct current is
Commutation failure can occur, but the low voltage threshold of different direct currents is not quite similar.
The voltage value before DC inversion side change of current bus exchange side Voltage Drop to failure after multi-infeed DC electric network fault
After certain percentage, then it is assumed that commutation failure occurs for the direct current, this is the Practical criterion of direct-current commutation failure.Therefore, root
It can determine that the friendship of commutation failure takes place in every direct current of multi-infeed DC power grid according to the common sense of those skilled in the art
Flow bus low voltage threshold.
Further, described calculate measures the horizontal index that multi-infeed DC network voltage temporarily stabilizes, and specifically includes:
The multi-infeed DC network voltage, which is calculated, by following formula temporarily stabilizes horizontal index:
In formula, IUFor voltage transient variation maintenance level index, λiFor the corresponding weighted value of i-th kind of fault type, M is failure classes
The total number of type, the sum of corresponding weighted value of fault type are 1；K is the substation to break down and circuit number, and L is to occur
The substation of failure and the total number of route；μjFor the operation power weighting values of j-th strip DC line, N is the total of DC line
Number；Vj,threFor the corresponding DC inversion side ac bus low voltage threshold of j-th strip DC line；Ui,j,kIt (t) is k-th of change
After i-th kind of failure occurs for power station or route, the ac bus voltage value of j-th strip DC line inverter side when t moment；t0For failure
Voltage is lower than V afterwardsj,threAt the time of, Δ t is Ui,j,k(t) it is lower than Vj,threDuration.
It preferably, referring to fig. 2, is that a kind of multi-infeed DC network voltage that the embodiment of the present invention one provides temporarily stabilizes water
The calculating schematic diagram of flat appraisal procedure.Integral termArea is indicated, particularly, if i-th kind of failure
The ac bus voltage value of j-th strip DC line inverter side is consistently higher than V afterwardsj,thre, then Δ t=0.
In a specific implementation, carries out multi-infeed DC network voltage and temporarily stabilize horizontal appraisal procedure specifically such as
Under:
Historical data is searched, acquires nearly 5 years most typical five classes failures of Guangdong Province's power grid and corresponding fault right weight value such as
Shown in the following table 1:
Nearly 5 years most typical five classes failures of 1 Guangdong Power Grid of table and weight
| Serial number | Fault type | Weighted value |
| 1 | Single back line single-phase earthing | 0.8933 |
| 2 | Single back line phase fault | 0.0501 |
| 3 | Single back line three-phase shortcircuit | 0.0265 |
| 4 | Double-circuit lines on the same pole road successive failure | 0.0177 |
| 5 | The single-phase permanent fault single-phase switch tripping of bus | 0.0124 |
Certain mechanism is according to ten before the empirically determined Guangdong Province's power grid of management and running crucial substation/route such as tables 2 and table 3
It is shown.
Ten crucial substations before 2 Guangdong Province's power grid of table
| Serial number | Power transformation station name |
| 1 | 500kV Huadu station |
| 2 | 500kV is from western station |
| 3 | 500kV Suidong station |
| 4 | The Zengcheng 500kV station |
| 5 | Sieve 500kV hole station |
| 6 | The 500kV modern times stand |
| 7 | The horizontal drip station 500kV |
| 8 | The Bao'an 500kV station |
| 9 | The Shuande 500kV station |
| 10 | The region of rivers and lakes 500kV station |
Ten critical circuits before 3 Guangdong Province's power grid of table
| Serial number | Line name |
| 1 | 500kV Huadu-is from western line |
| 2 | 500kV is from west-Boluo line |
| 3 | 500kV fringe east-horizontal drip line |
| 4 | The Zengcheng 500kV-region of rivers and lakes line |
| 5 | The Dongguan 500kV-Huizhou line |
| 6 | Sieve 500kV hole-north suburb line |
| 7 | 500kV cercis-modern times line |
| 8 | Shuande 500kV-Guangnan line |
| 9 | 500kV indulges river-Guan Chengxian |
| 10 | 500kV Dong Po-Huadu line |
Guangdong Province's multi-infeed DC power grid shares eight times direct current feed-ins, and respectively ox is from direct current, general emigrant's direct current, Chu Suizhi
Stream, Xingan's direct current, Tianguang HVDC, height start direct current, three wide direct currents, NW YUNNAN direct current, and corresponding eight DC inversion stations are respectively
From west, overseas Chinese hometown, fringe east, Bao'an, the north suburb, Zhaoqing, goose city and east station.
Time-domain-simulation analysis is carried out to each failure with PSD-BPA time-domain-simulation analysis software: under certain method of operation, In
When the single-phase permanent fault single-phase switch tripping failure of bus occurs in ten crucial substations described in upper table 2 respectively, record
The voltage of eight DC inversion side ac bus changes over time curve；It is sent out respectively on ten critical circuits described in upper table 3
Raw single back line single-phase earthing, single back line phase fault, single back line three-phase shortcircuit, double-circuit lines on the same pole road successive failure
When failure, the voltage for recording eight DC inversion side ac bus changes over time curve.
Each DC line operation power and corresponding operation power weighting values are as shown in table 4 before failure.
Each DC line operation power and corresponding weighted value before 4 failure of table
According to engineering experience, the ac bus low voltage threshold of commutation failure takes place (with electric before failure in every direct current
It is worth on the basis of the per unit value of pressure value) it is as shown in table 5 below.
The ac bus low voltage threshold of commutation failure takes place in the every DC line of table 5
| Serial number | DC line title | Low voltage threshold |
| 1 | Ox is from direct current | 0.91p.u. |
| 2 | General emigrant's direct current | 0.88p.u. |
| 3 | Chu Sui direct current | 0.90p.u. |
| 4 | Xingan's direct current | 0.91p.u. |
| 5 | Tianguang HVDC | 0.89p.u. |
| 6 | Height starts direct current | 0.88p.u. |
| 7 | Three wide direct currents | 0.89p.u. |
| 8 | NW YUNNAN direct current | 0.90p.u. |
According to formulaCalculate the measurement more direct currents in Guangdong under this method of operation
The voltage transient variation maintenance level index I of feed-in power gridU=0.986.This value is bigger, and voltage transient variation maintenance level is weaker, and power grid supports
The ability of imperial failure is weaker.
A kind of multi-infeed DC network voltage provided in an embodiment of the present invention temporarily stabilize horizontal appraisal procedure, device and
Storage medium has the following beneficial effects:
It can be based on multiple faults type, in conjunction with the weighted value of each fault type in the historical data, synthetically, integrally
It measures multi-infeed DC network voltage and temporarily stabilizes level；The fault type occurred in all historical datas can be chosen, also can
It is enough selectively to choose typical or common fault type, targetedly assessed；By determining crucial substation and pass
Key route targetedly carries out the voltage monitoring after failure, extracts more direct current feedbacks after crucial substation and critical circuits failure
Enter the voltage change curve of all DC inversion sides ac bus in power grid；Finally according to the voltage transient variation of multi-infeed DC power grid
Maintenance level index measures multi-infeed DC network voltage and temporarily stabilizes level, obtains comprehensive, accurate, targeted assessment knot
Fruit.
It is that a kind of multi-infeed DC network voltage provided by Embodiment 2 of the present invention temporarily stabilizes horizontal comment referring to Fig. 3
Estimate the structural schematic diagram of device, comprising:
Fault type statistic unit 201, for counting the fault type that multi-infeed DC power grid occurs according to historical data,
And calculate the corresponding fault right weight value of each fault type；
Voltage change acquisition unit 202, after being recorded in the multi-infeed DC grid collapses, more direct currents
The voltage change curve of all DC inversion sides ac bus in feed-in power grid；
Power calculation unit 203 is run, for calculating the operation function of every DC line in the multi-infeed DC power grid
Rate weighted value；
Low voltage threshold determination unit 204, for determining that the corresponding DC inversion top-cross stream of DC line described in each item is female
Line low voltage threshold；Wherein, the DC inversion side ac bus low voltage threshold is that the corresponding DC line changes
Mutually voltage value when failure；
Indicator calculating unit 205, the fault type sum for being occurred according to the multi-infeed DC power grid, each failure
The corresponding weighted value of type and voltage change curve calculate measurement multi-infeed DC network voltage and temporarily stabilize horizontal index；
Maintenance level measures unit 206, horizontal for temporarily being stabilized according to the measurement multi-infeed DC network voltage
Index obtains multi-infeed DC network voltage and temporarily stabilizes level.
The embodiment of the present invention three is corresponding to be provided a kind of multi-infeed DC network voltage and temporarily stabilizes horizontal assessment device,
Including processor, memory and stores in the memory and be configured as the computer journey executed by the processor
Sequence, the processor realize the multi-infeed DC network voltage as described in the embodiment of the present invention one when executing the computer program
Temporarily stabilize horizontal appraisal procedure.The multi-infeed DC network voltage temporarily stabilizes horizontal assessment device and can be on table
Type computer, notebook, palm PC and cloud server etc. calculate equipment.The multi-infeed DC network voltage temporarily stabilizes
Horizontal assessment device may include, but be not limited only to, processor, memory.
The correspondence of the embodiment of the present invention four provides a kind of computer readable storage medium, which is characterized in that the computer
Readable storage medium storing program for executing includes the computer program of storage, wherein controlling the computer in computer program operation can
The multi-infeed DC network voltage that equipment where reading storage medium executes as described in the embodiment of the present invention one temporarily stabilizes horizontal
Appraisal procedure.
Alleged processor can be central processing unit (Central Processing Unit, CPU), can also be it
His general processor, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
It is the control centre that the multi-infeed DC network voltage temporarily stabilizes horizontal assessment device Deng, the processor, using each
Kind interface and the entire multi-infeed DC network voltage of connection temporarily stabilize the various pieces of horizontal assessment device.
The memory can be used for storing the computer program and/or module, and the processor is by operation or executes
Computer program in the memory and/or module are stored, and calls the data being stored in memory, described in realization
Multi-infeed DC network voltage temporarily stabilizes the various functions of horizontal assessment device.The memory can mainly include storage journey
Sequence area and storage data area, wherein storing program area can the (ratio of application program needed for storage program area, at least one function
Such as sound-playing function, image player function) etc.；Storage data area, which can be stored, uses created data according to mobile phone
(such as audio data, phone directory etc.) etc..In addition, memory may include high-speed random access memory, it can also include non-
Volatile memory, such as hard disk, memory, plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), safe number
Word (Secure Digital, SD) card, flash card (Flash Card), at least one disk memory, flush memory device or its
His volatile solid-state part.
Wherein, if the multi-infeed DC network voltage temporarily stabilizes the integrated module/unit of horizontal assessment device
It is realized in the form of SFU software functional unit and when sold or used as an independent product, can store computer-readable at one
It takes in storage medium.Based on this understanding, the present invention realizes all or part of the process in above-described embodiment method, can also be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a computer-readable storage
In medium, the computer program is when being executed by processor, it can be achieved that the step of above-mentioned each embodiment of the method.Wherein, described
Computer program includes computer program code, the computer program code can for source code form, object identification code form,
Executable file or certain intermediate forms etc..The computer-readable medium may include: that can carry the computer program
Any entity or device of code, recording medium, USB flash disk, mobile hard disk, magnetic disk, CD, computer storage, read-only memory
(ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, electricity
Believe signal and software distribution medium etc..
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
It needs that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.In addition, device provided by the invention
In embodiment attached drawing, the connection relationship between module indicate between them have communication connection, specifically can be implemented as one or
A plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, it can understand
And implement.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of multi-infeed DC network voltage temporarily stabilizes horizontal appraisal procedure characterized by comprising
The fault type that multi-infeed DC power grid occurs is counted according to historical data, and calculates the corresponding failure of each fault type
Weighted value；
After being recorded in the multi-infeed DC grid collapses, all DC inversion top-cross streams in the multi-infeed DC power grid
The voltage change curve of bus；
Calculate the operation power weighting values of every DC line in the multi-infeed DC power grid；
Determine the corresponding DC inversion side ac bus low voltage threshold of DC line described in each item；Wherein, the DC inversion
Side ac bus low voltage threshold is voltage value when commutation failure occurs for the corresponding DC line；
Fault type sum, the corresponding weighted value of each fault type and the voltage occurred according to the multi-infeed DC power grid
Change curve calculates measurement multi-infeed DC network voltage and temporarily stabilizes horizontal index；
It is temporary that horizontal index acquisition multi-infeed DC network voltage is temporarily stabilized according to the measurement multi-infeed DC network voltage
Stabilize level.
2. a kind of multi-infeed DC network voltage as described in claim 1 temporarily stabilizes horizontal appraisal procedure, feature exists
In, it is described to calculate the corresponding fault right weight value of each fault type, it specifically includes:
If i-th kind of failure frequency of the multi-infeed DC power grid is ni, then its corresponding weighted value λiShown in following formula:
In formula, M is the total number of fault type.
3. a kind of multi-infeed DC network voltage as claimed in claim 2 temporarily stabilizes horizontal appraisal procedure, feature exists
In the operation power weighting values for calculating every DC line in the multi-infeed DC power grid specifically include:
If μjFor the operation power weighting values of j-th strip DC line, then μ is calculated by following formulaj:
In formula, N is the total number of the DC line.
4. a kind of multi-infeed DC network voltage as claimed in claim 3 temporarily stabilizes horizontal appraisal procedure, feature exists
In, further includes:
Determine crucial substation and the critical circuits for leading to the multi-infeed DC grid collapses.
5. a kind of multi-infeed DC network voltage as claimed in claim 4 temporarily stabilizes horizontal appraisal procedure, feature exists
In, described calculate measures the horizontal index that multi-infeed DC network voltage temporarily stabilizes, it specifically includes:
The multi-infeed DC network voltage, which is calculated, by following formula temporarily stabilizes horizontal index:
In formula, IUFor voltage transient variation maintenance level index, λiFor the corresponding weighted value of i-th kind of fault type, M is fault type
Total number, the sum of corresponding weighted value of fault type are 1；K is the substation to break down and circuit number, and L is to break down
Substation and route total number；μjFor the operation power weighting values of j-th strip DC line, N is the total number of DC line；
Vj,threFor the corresponding DC inversion side ac bus low voltage threshold of j-th strip DC line；Ui,j,k(t) for k-th of substation or
After i-th kind of failure occurs for route, the ac bus voltage value of j-th strip DC line inverter side when t moment；t0For voltage after failure
Lower than Vj,threAt the time of, Δ t is Ui,j,k(t) it is lower than Vj,threDuration.
6. a kind of multi-infeed DC network voltage temporarily stabilizes horizontal assessment device characterized by comprising
Fault type statistic unit for counting the fault type that multi-infeed DC power grid occurs according to historical data, and calculates
The corresponding fault right weight value of each fault type；
Voltage change acquisition unit, after being recorded in the multi-infeed DC grid collapses, the multi-infeed DC electricity
The voltage change curve of all DC inversion sides ac bus in net；
Power calculation unit is run, for calculating the operation power weight of every DC line in the multi-infeed DC power grid
Value；
Low voltage threshold determination unit, for determining the corresponding DC inversion side ac bus low-voltage of DC line described in each item
Threshold value；Wherein, when the DC inversion side ac bus low voltage threshold is that commutation failure occurs for the corresponding DC line
Voltage value；
Indicator calculating unit, the fault type sum for being occurred according to the multi-infeed DC power grid, each fault type phase
The weighted value and voltage change curve answered calculate measurement multi-infeed DC network voltage and temporarily stabilize horizontal index；
Maintenance level measures unit, obtains for temporarily stabilizing horizontal index according to the measurement multi-infeed DC network voltage
Multi-infeed DC network voltage temporarily stabilizes level.
7. a kind of multi-infeed DC network voltage temporarily stabilizes horizontal assessment device, including processor, memory and storage
In the memory and it is configured as the computer program executed by the processor, the processor executes the computer
It is horizontal to realize that a kind of multi-infeed DC network voltage as described in any one of claim 1 to 5 temporarily stabilizes when program
Appraisal procedure.
8. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium includes the calculating of storage
Machine program, wherein equipment where controlling the computer readable storage medium in computer program operation is executed as weighed
Benefit require any one of 1 to 5 described in a kind of multi-infeed DC network voltage temporarily stabilize horizontal appraisal procedure.
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