CN108988401A - The appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity and its constraint condition - Google Patents
The appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity and its constraint condition 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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a kind of multichannel alternating current-direct current mixed connection section ability to transmit electricity and its appraisal procedures of constraint condition, load factor column matrix η of the alternating current-direct current power flow transfer than matrix D and alternating current circuit for calculating mixed connection section first, further according to line load rate matrix λ after matrix D and matrix η and the rated power of each alternating current circuit calculating alternating current circuit generation N-1 failure；Judge whether the greatest member in line load rate matrix λ is 1, and adjust the trend of exchange section according to judging result, then calculates the ability to transmit electricity P of exchange sectiona；The ability to transmit electricity P of flexible direct current section is calculated againd；Finally according to the ability to transmit electricity P of exchange sectionaWith the ability to transmit electricity P of flexible direct current sectiondDetermine the ability to transmit electricity and constraint condition of mixed connection section.The present invention can be realized the rapid evaluation of multichannel alternating current-direct current mixed connection section ability to transmit electricity and constraint condition containing flexible direct current, and the calculating time is short, computational efficiency is high and calculated result is more accurate reasonable.
Description
Technical field
The present invention relates to Power System Analysis technical fields, and in particular to a kind of multichannel alternating current-direct current containing flexible direct current is mixed
Join the appraisal procedure of section ability to transmit electricity and its constraint condition.
Background technique
Currently, electric system has been gradually formed with clearly sending, being interconnected pattern by the whole nation of relationship, transmission cross-section is as connection
It is the important interconnection group between Grid, is the object of system safety operation emphasis monitoring and control.As direct current, flexibility are straight
The fast development of technology of transmission of electricity is flowed, transmission cross-section composition form is become handing over straight mixed connection section, section from traditional exchange section
Operation characteristic is increasingly complex.In conventional AC section, after certain line fault is out of service, the line power is according to impedance relationship
It is transferred to other alternating current circuits in section respectively.In alternating current-direct current side-by-side cross-section, after certain AC/DC line fault is out of service,
The relations of distribution of the line transitions power in section on other routes by after direct current system power control strategy and failure other
Alternating current circuit impedance relationship determines jointly.The electrode limit of entire alternating current-direct current mixed connection section had both been limited by alternating current circuit N-1 simultaneously
Failure is subject to DC line N-1 failure.
Flexible direct current compared with Traditional DC, have it is active/idle it is separately adjustable, from commutation, trend reverse voltage polarity
It is constant, without the technical advantages such as reactive-load compensation equipment, the grid power transmission supported to non-transformer may be implemented.Flexible direct current can lead to
Back-to-back form is crossed with certain alternating current circuit series connection in exchange section, forms alternating current-direct current mixed connection section, it is possible to increase entire section is defeated
Electric limit reduces two sides busbar short-circuit levels of current.
Compared with the ability to transmit electricity of conventional AC section and constraint condition are sought, the multichannel alternating current-direct current containing flexible direct current is mixed
Connection section ability to transmit electricity and constraint condition are sought increasingly complex.The choosing of concern flexible direct current rated capacity is also needed in finding process
Select, be substantially after primarily determining flexible direct current rated capacity at present, by a large amount of alternating current-direct current mixed connection section ability to transmit electricity and
Flexible direct current rated capacity is corrected in constraint condition tentative calculation, and this method cannot sufficiently excavate flexible direct current rated capacity and alternating current-direct current
Relationship between mixed connection section ability to transmit electricity, the selection of flexible direct current rated capacity is not reasonable, and traditional section transmission of electricity
Limit Calculation Method is that limiting value is determined by a large amount of Load flow calculation, stability Calculation, and this method, which exists, calculates complicated, calculation amount
Greatly, the problem of taking a long time, can not rapidly and accurately to containing flexible direct current multichannel alternating current-direct current mixed connection section ability to transmit electricity and
Constraint condition is assessed.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of multichannel alternating current-direct current mixed connection section ability to transmit electricity and constraint items
The appraisal procedure of part can be realized the quick of multichannel alternating current-direct current mixed connection section ability to transmit electricity containing flexible direct current and constraint condition
Assessment, and obtains the flexible direct current rated capacity for meeting above-mentioned constraint, calculate that the time is short, computational efficiency is high and calculated result more
It is accurate reasonable.
In order to solve the above technical problem, the present invention provides technical solution it is as follows:
A kind of appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity and constraint condition, comprising the following steps:
1) the alternating current-direct current power flow transfer for calculating the alternating current-direct current mixed connection section compares matrix D
2) the load factor column matrix η of alternating current circuit in the alternating current-direct current mixed connection section is calculated；
3) more specified than matrix D and alternating current circuit load factor column matrix η and each alternating current circuit according to alternating current-direct current power flow transfer
Line load rate matrix λ after N-1 failure occurs for power calculation alternating current circuit；
4) judge whether the greatest member in line load rate matrix λ is 1, if being judged as YES, is transferred to step 6), it is no
Then, it is transferred to step 5)；
5) trend for exchanging section in the alternating current-direct current mixed connection section is adjusted, and is transferred to step 2)；
6) the ability to transmit electricity P of the exchange section is calculatedaAnd its constraint condition；
7) rated capacity and its constraint condition of every flexible direct current route in the alternating current-direct current mixed connection section are successively calculated；
8) the ability to transmit electricity P of flexible direct current section is determined according to the rated capacity of every flexible direct currentd；
9) according to the ability to transmit electricity P of exchange sectionaWith the ability to transmit electricity P of flexible direct current sectiondDetermine the alternating current-direct current mixed connection
The ability to transmit electricity and its constraint condition of section.
The alternating current-direct current power flow transfer of mixed connection section is obtained than matrix D according to following steps in the step 1):
Flexible direct current line power is set to the initial power of pre- installing flexible direct current route first, then by alternating current-direct current
Whole routes take turns doing the analysis of N-1 Fault load flow in mixed connection section, obtain alternating current-direct current power flow transfer than matrix D:
Wherein, D1Indicate the transfer factor matrix between alternating current circuit；D2Indicate transfer of the flexible direct current route to alternating current circuit
Factor matrix；D3Indicate alternating current circuit to the transfer factor matrix of flexible direct current route；D4Indicate the transfer between flexible direct current route
Factor matrix.
In the step 2) in the load factor column matrix η of alternating current circuit the i-th row element ηiAre as follows:
Wherein, PiIndicate i-th line road l in alternating current-direct current mixed connection sectioniThe active power of conveying, PiNIndicate route liVolume
Determine power.
The element λ that the i-th row jth arranges in load rate matrix λ in the step 3)ijAre as follows:
Wherein, ηiFor the element of the i-th row in the load factor column matrix η of alternating current circuit, ηjFor the load factor column square of alternating current circuit
The element of jth row, D in battle array ηijIt is alternating current-direct current power flow transfer than the element that the i-th row jth in matrix D arranges, PjNFor alternating current-direct current mixed connection
J-th strip route l in sectionjRated power.
The trend of section is exchanged in the step 5) in the adjustment alternating current-direct current mixed connection section specifically: if load rate matrix
Greatest member value is greater than 1 in λ, then reduces the trend of the exchange section；If loading rate matrix λ greatest member value less than 1, increase
Add the trend of the exchange section.
Section ability to transmit electricity P is exchanged in the step 6)aAnd its constraint condition is specifically obtained by following steps:
Wherein, Pi' it is route l when load rate matrix λ greatest member value is equal to 1iActive power；
If loading element of the greatest member value equal to 1 in rate matrix λ is λij, then the constraint condition for exchanging section is AC line
Road ljRoute l after generation N-1 failureiReach rated power.
The rated capacity of every flexible direct current is obtained by following steps in the step 7):
First calculate flexible direct current route l in the alternating current-direct current mixed connection sectionpThe load factor column matrix of alternating current circuit after disconnection
λpIf load factor column matrix λpIn greatest member value be located at q row, then flexible direct current route lpRated capacity PpAre as follows:
Wherein, P 'qRate matrix λ is loaded for alternating current circuitpRoute l when greatest member value is equal to 1qActive power； PqNTable
Timberline road lqRated power, DqpIt is alternating current-direct current power flow transfer than the element that q row pth in matrix D arranges, PpNIndicate flexible direct current
Route lpRated power；
As flexible direct current route lpRated capacityWhen, then flexible direct current route lpConstraint condition are as follows:
Flexible direct current route lpAfter N-1 failure occurs, alternating current circuit lqTransmission power reaches its rated value；
As flexible direct current route lpRated capacity PpFor PpNWhen, then flexible direct current route lpConstraint condition are as follows: it is flexible straight
Flow Line lpRated power be limited by the rated power of installed alternating current circuit.
Flexible direct current section ability to transmit electricity P in the step 8)dFor the sum of the rated capacity of all flexible direct current routes.
Alternating current-direct current mixed connection section ability to transmit electricity and constraint condition are specifically obtained by following steps in the step 9):
Firstly, to exchange section ability to transmit electricity PaIt is modified and obtains final exchange maximum transfer power P 'a,
And to direct current transportation section ability PdIt is finely adjusted and obtains final flexible direct current maximum transfer power P 'd, then
According to Pmax=P 'a+P′d, obtain alternating current-direct current mixed connection section ability to transmit electricity Pmax, the constraint condition of alternating current-direct current mixed connection section are as follows: exchange
The constraint condition of section and the constraint condition of flexible direct current route.
It is handed over directly the invention has the following advantages: appraisal procedure of the invention can be realized the multichannel containing flexible direct current
The rapid evaluation of mixed connection section ability to transmit electricity and constraint condition is flowed, and obtains the flexible direct current rated capacity for meeting above-mentioned constraint,
The calculating time is short, computational efficiency is high and calculated result is more accurate reasonable, meets engineering application requirement.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is the power graph that section route after N-1 failure occurs for flexible direct current route；
Fig. 3 be fine tuning after praise and-extensively at route occur N-2 failure after section route power graph；
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, the appraisal procedure of a kind of multichannel alternating current-direct current mixed connection section ability to transmit electricity and its constraint condition, multi-pass
Road alternating current-direct current mixed connection section includes flexible direct current route and alternating current circuit, the appraisal procedure the following steps are included:
The master data of alternating current-direct current mixed connection section is read first, which includes: the line in alternating current-direct current mixed connection section
Road sum, the pre- rated power P for installing the flexible direct current number of lines, AC line travel permit number and each routeiN.Wherein alternating current-direct current
Route in mixed connection section is denoted as li, i=1,2,3 ... m, wherein preceding n route is alternating current circuit, rear m-n route is prepackage
If the route of flexible direct current device.
Then assessment is followed the steps below:
1) the alternating current-direct current power flow transfer for calculating alternating current-direct current mixed connection section compares matrix D；
Flexible direct current line power is set to the initial power of pre- installing flexible direct current route first, then by alternating current-direct current
Whole routes take turns doing the analysis of N-1 Fault load flow in mixed connection section, obtain alternating current-direct current power flow transfer than matrix D:
Wherein, wherein D1Matrix is tieed up for n × n, indicates the transfer factor matrix between alternating current circuit；D2It is n × (m-n) dimension
Matrix indicates flexible direct current route to the transfer factor matrix of alternating current circuit；D3It is (m-n) × n dimension matrix, indicates AC line
Transfer factor matrix of the road to flexible direct current route；D4It is (m-n) × (m-n) dimension matrix, indicates turn between flexible direct current route
Move factor matrix.
Element D of the alternating current-direct current power flow transfer than the i-th row jth column in matrix DijAre as follows:
Wherein, Δ PijIndicate j-th strip route ljAfter N-1 failure occurs, it is transferred to i-th line road liPower； PjIt indicates
J-th strip route ljPower before N-1 failure occurs；DijIndicate j-th strip route ljWhen N-1 failure occurs, i-th line road liTide
Flow transfer ratio.
Although above-mentioned alternating current-direct current power flow transfer is to be obtained based on current Load flow calculation, but reflection is entire disconnected than matrix D
The inherent characteristic in face, when big variation does not occur for section structure, section two sides system grid structure, different section power is corresponding
Alternating current-direct current power flow transfer it is more essentially identical than matrix D.
Consider existing flexible direct current engineering practice, when being set in alternating current circuit, flexible direct current N-1 failure, Qi Tarou
Property dc power remains unchanged, i.e., D at this time3For null matrix, D4For unit matrix namely D3=0(m-n)×n, D4=E(m-n)×(m-n)。
D3Power will not be transferred to flexible direct current route after showing certain alternating current circuit N-1 failure for null matrix；D3Show for unit matrix
After certain flexible direct current route N-1 failure, other flexible direct current power are constant, which is fully transferred to hand over
Flow Line.If flexible direct current power adjustable after failure, corresponding modification D3、D4?.
2) trend of alternating current-direct current mixed connection section is read and according to alternating current circuit in the Load flow calculation alternating current-direct current mixed connection section
Load factor column matrix η；
Wherein in alternating current circuit load factor column matrix η the i-th row element ηiAre as follows:
Wherein, PiIndicate i-th line road l in alternating current-direct current mixed connection sectioniConveying active power, PiNIndicate i-th line
Road liRated power.
3) each alternating current circuit according to alternating current-direct current power flow transfer than matrix D and alternating current circuit load factor column matrix η and reading
Rated power calculate alternating current circuit occur N-1 failure after line load rate matrix λ；
Wherein, the element λ of the i-th row jth column in rate matrix λ is loadedijAre as follows:
Wherein, PijFor j-th strip alternating current circuit ljRoute l after disconnectioniActive power, PiNIndicate i-th line road liVolume
Determine power；ηiFor the element of the i-th row in the load factor column matrix η of alternating current circuit, ηjFor jth row in the load factor column matrix η of alternating current circuit
Element, DijCompare matrix D for alternating current-direct current power flow transfer1In the i-th row jth column element, PjNIndicate route ljRated power.
λijExpression is route ljRoute l after generation N-1 failureiLoad factor.
4) judge whether the greatest member in line load rate matrix λ is 1, if being judged as YES, is transferred to step 6), it is no
Then, it is transferred to step 5)；
5) trend for exchanging section in alternating current-direct current mixed connection section is adjusted, and is transferred to step 2)；
Wherein, adjustment exchange section tidal current specifically: if greatest member value is greater than 1 in load rate matrix λ, reduce exchange
The trend of section；If load rate matrix λ greatest member value is less than 1, the trend for section of increasing exchanges.
6) the ability to transmit electricity P of exchange section is calculatedaAnd its corresponding constraint condition；
Wherein, section ability to transmit electricity P is exchangedaIt is obtained by the following formula:
In formula, P 'iRoute l when being equal to 1 for load rate matrix λ greatest member valueiActive power；
It is to be appreciated that PaIt is the power in continuous adjustment exchange section until the greatest member value of load rate matrix λ is 1
When, the sum of the power of section alternating current circuit.
If loading element of the greatest member value equal to 1 in rate matrix λ is λij, then the corresponding constraint condition of section is exchanged to hand over
Flow Line ljRoute l after generation N-1 failureiReach rated power, i.e. the ability to transmit electricity of exchange section is limited by above-mentioned constraint item
Part, above-mentioned constraint condition are the attainable limiting conditions of exchange section ability to transmit electricity institute.
7) rated capacity of every flexible direct current route in alternating current-direct current mixed connection section is successively calculated；
Wherein, the rated capacity of every flexible direct current is obtained by following steps:
First calculate pth flexible direct current route lpAlternating current circuit load factor column matrix λ after (n < p≤m) disconnectionp, load
Rate column matrix λpIn the i-th row element λipAre as follows:
Wherein, ηiFor the element of the i-th row in the load factor column matrix η of alternating current circuit, DipCompare square for alternating current-direct current power flow transfer
The element of i-th row pth column, P in battle array DiNFor i-th line road l in alternating current-direct current mixed connection sectioniRated power；
If load factor column matrix λpMiddle greatest member value is located at q row, as λqp(λqp=1), then flexible direct current route lp
Rated capacity PpAre as follows:
Wherein, P 'qRate matrix λ is loaded for alternating current circuitpAlternating current circuit l when greatest member value is equal to 1qActive power；
PqNIndicate alternating current circuit lqRated power, DqpIt is alternating current-direct current power flow transfer than the element that q row pth in matrix D arranges, PpNTable
Show flexible direct current route lpRated power.
Keep remaining alternating current circuit power constant during adjusting flexible direct current line power in the above process, i.e.,
P′qSection ability to transmit electricity P is exchanged to calculateaAlternating current circuit l afterwardsqPower.
If flexible direct current route lpRated capacity PpForThen flexible direct current route lpConstraint condition are as follows: it is flexible
DC line lpAfter N-1 failure occurs, alternating current circuit lqTransmission power reaches its rated value；
If flexible direct current route lpRated capacity PpFor PpN, then flexible direct current route lpConstraint condition are as follows: flexible direct current
Route lpRated power be limited by the rated power of installed alternating current circuit, after N-1 failure occurs for flexible direct current route at this time,
It exchanges any one line power of section and is less than its rated power.When flexible direct current uses back-to-back form, flexible direct current line
Road transimission power is needed by alternating current circuit, so if flexible direct current rated power is PpN, flexible direct current route transmission power wants
Restriction by alternating current circuit rated power where it.
The ability to transmit electricity of direct current section is limited by the constraint condition of above-mentioned flexible direct current route, and above-mentioned constraint condition is direct current
The attainable limiting condition of ability to transmit electricity institute of section.
8) the ability to transmit electricity P of flexible direct current section is determined according to the rated capacity of every flexible direct currentd；
Flexible direct current section ability to transmit electricity PdFor the sum of the rated capacity of all flexible direct current routes, it may be assumed that
P in above formulajFor the P acquired in step 7)p。
9) according to the ability to transmit electricity P of exchange sectionaWith the ability to transmit electricity P of flexible direct current sectiondDetermine alternating current-direct current mixed connection section
Ability to transmit electricity and constraint condition.
Alternating current-direct current mixed connection section ability to transmit electricity PmaxAnd constraint condition is specifically obtained by following steps:
Firstly, to exchange section ability to transmit electricity PaIt is modified and obtains final exchange maximum transfer power P 'a, and it is right
Direct current transportation section ability PdIt is finely adjusted and obtains final flexible direct current maximum transfer power P 'd, then according to Pmax=P 'a
+P′dObtain alternating current-direct current mixed connection section ability to transmit electricity Pmax, the constraint condition of alternating current-direct current mixed connection section are as follows: exchange the constraint item of section
The constraint condition of part and flexible direct current route.
Wherein to the exchange section ability to transmit electricity P being calculatedaIt is further corrected by stability Calculation, it is final to obtain
Exchange maximum transfer power P 'a, it is as follows specifically to correct principle:
If route ljRoute l after generation N-1 failureiTransmission power be more than its rated value, then reduce exchange section power；
If route ljRoute l after generation N-1 failureiTransmission power is lower than its rated value, then increases exchange section power；Until route lj
Route l after generation N-1 failureiTransmission power is equal to its rated value, recalculates the value that exchange section ability to transmit electricity obtains at this time
As final exchange maximum transfer power P 'a,
To the direct current section ability P being calculateddIt is further corrected by stability Calculation, to obtain final flexible direct current
Maximum transfer power P 'd, it is as follows specifically to correct principle:
For flexible direct current route lpIf flexible direct current route lpAlternating current circuit l after generation N-1 failureqTransmission power is super
Its rated value is crossed, then reduces exchange section power；If route lpRoute l after generation N-1 failureqTransmission power is specified lower than its
Value, then increase exchange section power；Until route lpRoute l after generation N-1 failureqTransmission power is equal to its rated value, weighs at this time
The value that new calculating flexible direct current section ability to transmit electricity obtains is final exchange maximum transfer power P 'd。
Below in Henan Electric Power System Henan-Henan south section for illustrate above-mentioned appraisal procedure, in the flower of the auspicious symbol of Huadu-
All after the side configuration back-to-back equipment of flexible direct current, using in above method rapid evaluation Henan-ability to transmit electricity of Henan south section and about
Beam condition, and determine flexible direct current rated capacity.
In Henan and Henan south section interconnection by it is good and-extensively at double loop (because parallel lines on same tower handle as a loop line), it is military it is all-
Totally five route roads form for Fragrance Hill, military week-painting meeting, auspicious symbol-Huadu double loop, install flexible direct current in the Huadu side of auspicious symbol-Huadu
Back-to-back device；
S1: reading Henan Electric Power system research data (year mode) and be used as Research foundation, will it is good and-it is extensively fragrant at, military week-
Mountain, military week-painting meeting, auspicious symbol-Huadu double loop is numbered respectively is route l1、l2、l3、l4、l5, wherein l4And l5It is flexible straight for installing
The route of flow device, l1、l2And l3For alternating current circuit, flexible direct current collocation form is to access in Huadu side back backrest, l1~l5Respectively
The rated power of route is as shown in table 1.
1 section of table respectively forms route rated power
| Circuit number | Rated power (MW) |
| l1 | 5020 |
| l2 | 1920 |
| l3 | 2560 |
| l4 | 2200 |
| l5 | 2200 |
S2: flexible direct current power is set to the power of pre- installing flexible direct current route, i.e. l4And l5It is 1150MW.It utilizes
Table 1 takes turns doing the analysis of N-1 Fault load flow to route in section, and alternating current-direct current power flow transfer is thus calculated than matrix D:
S3: under original state in Henan-Henan south section line power and load factor it is as shown in table 2,
2 original state section line power of table and load factor
| Route | Initial power (MW) | Route rated power (MW) | Load factor |
| It is good and-extensively at | 797 | 5020 | 15.89% |
| Military week-Fragrance Hill | 323 | 1920 | 16.82% |
| Military week-painting meeting | 922 | 2560 | 36.02% |
| Auspicious symbol-Huadu 1 | 1160 | 2200 | 52.73% |
| Auspicious symbol-Huadu 2 | 1159 | 2200 | 52.68% |
N-1 accident analysis successively is done to alternating current circuit according to table 2, and combines alternating current-direct current power flow transfer than matrix D, and
FormulaIt calculates alternating current circuit and does N-1 event
Power transfer case after barrier, finally obtaining load rate matrix λ is
It is as shown in table 3 to exchange N-1 Fault load flow analysis in alternating current circuit under limiting condition:
The analysis of 3 original state alternating current circuit N-1 Fault load flow of table
By above-mentioned load rate matrix λ and table 3 it is found that load rate matrix greatest member is 49%, rate matrix greastest element is loaded
Element is less than 1, it is therefore desirable to continue to increase exchange section tidal current, to increase alternating current circuit load factor.
S4: constantly increasing exchange section power, when section power increases 1900MW, in Henan-Henan south section line power
And load factor is as shown in table 4, successively does N-1 accident analysis to alternating current circuit, can be pushed away according to alternating current-direct current power flow transfer than matrix D
Power transfer case after calculation alternating current circuit N-1 failure exchanges alternating current circuit N-1 Fault load flow under limiting condition and analyzes such as 5 institute of table
Show.
Table 4 exchanges section line power and load factor under limiting condition
Table 5 exchanges route N-1 Fault load flow under limiting condition and analyzes
Finally obtain load rate matrix λ are as follows:
Praise as shown in Table 5 and-be extensively 1926MW at week-Fragrance Hill power military after N-2, load factor 100% is load factor square
Battle array greatest member, and to load the value that rate matrix is uniquely more than or equal to 100%.Thus may determine that exchange profile constraints condition is
It is good and-extensively at N-2 after, military week-Fragrance Hill power reaches rated power, calculates exchange section ability to transmit electricity at this time and isWherein P '1=1953, P '2=768, P '3=1207.
S5: on the basis of above-mentioned alternating current circuit ability to transmit electricity, twice soft straight line path l4And l5Power is identical, only to one
Analysis calculates flexible direct current route l5Load factor column matrix in alternating current circuit is λ after disconnection5=[45.15% 48.30%
73.98%]T, after flexible direct current route does N-1 failure, military week-painting can line power be 1894MW, load factor 73.98%,
For alternating current circuit load factor maximum route, alternating current-direct current power flow transfer is than matrix D, meter after doing N-1 failure according to flexible direct current route
It calculates flexible direct current route and does the soft straight line path power that military week-painting meeting line load rate can be made to reach 100% after N-1 failure are as follows:It is P that flexible direct current, which installs route rated power,dcN=2200MW, then flexible direct current route l4
And l5Rated capacity be P4=P5=min (Pdc, PdcN)=2200MW, and not will cause friendship after flexible direct current generation N-1 failure
Any line power overrate in Flow Line section, as shown in Fig. 2, flexible direct current maximum transfer power is P at this timed=P4+
P5=4400MW.
S6: when exchange section power is Pa, twice flexible direct current line powers are Pd, it is good and-extensively do N-2 failure at route
Military week-Fragrance Hill power is 2080MW afterwards, is more than route rated power, needs suitably to reduce exchange section power.When exchange section
When the limit is down to 3673MW, it is good and-extensively do N-2 failure at route after military week-Fragrance Hill power reach its rated power 1920MW,
Old friend's flow section electrode limit is adjusted to P 'a=3673MW, the constant P ' of flexible direct current maximum transfer powerd=Pd=4400MW, Henan
In-Henan south maximum transfer power be Pmax=P 'a+P′d=8073MW, constraint condition be it is good and-it is extensively military after N-2 failure at occurring
Week-, Fragrance Hill power reached rated power, as shown in Figure 3.The line power and load factor such as table 6 of final alternating current-direct current mixed connection section
It is shown.
6 finished section line power of table and load factor
The appraisal procedure of the present embodiment is calculated do not wrapped first based on the flow transferring relativity factor in alternating current-direct current power flow transfer matrix
The electrode limit and constraint condition of exchange section containing flexible direct current calculate flexible direct current route on this basis and N-1 event occur
The flexible direct current maximum power for not making alternating current circuit power out-of-limit after barrier, so that it is straight finally to realize that the multichannel containing flexible direct current is handed over
The rapid evaluation of mixed connection section ability to transmit electricity and constraint condition is flowed, and obtains the flexible direct current rated capacity for meeting above-mentioned constraint,
This method avoids blindly adjusting, and is greatly reduced and calculates the time, improves computational efficiency, and calculated result is more accurately closed
Reason, meets engineering application requirement, is conducive under the premise of ensureing section safe and stable operation, as far as possible raising section transmission of electricity energy
Power.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (9)
1. the appraisal procedure of a kind of multichannel alternating current-direct current mixed connection section ability to transmit electricity and its constraint condition, characterized in that including with
Lower step:
1) the alternating current-direct current power flow transfer for calculating the alternating current-direct current mixed connection section compares matrix D；
2) the load factor column matrix η of alternating current circuit in the alternating current-direct current mixed connection section is calculated；
3) rated power according to alternating current-direct current power flow transfer than matrix D and alternating current circuit load factor column matrix η and each alternating current circuit
It calculates alternating current circuit and line load rate matrix λ after N-1 failure occurs；
4) judge whether the greatest member in line load rate matrix λ is 1, if being judged as YES, is transferred to step 6), otherwise, turn
Enter step 5)；
5) trend for exchanging section in the alternating current-direct current mixed connection section is adjusted, and is transferred to step 2)；
6) the ability to transmit electricity P of the exchange section is calculatedaAnd its constraint condition；
7) rated capacity and its constraint condition of every flexible direct current route in the alternating current-direct current mixed connection section are successively calculated；
8) the ability to transmit electricity P of flexible direct current section is determined according to the rated capacity of every flexible direct currentd；
9) according to the ability to transmit electricity P of exchange sectionaWith the ability to transmit electricity P of flexible direct current sectiondDetermine the alternating current-direct current mixed connection section
Ability to transmit electricity and its constraint condition.
2. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
It is characterized in, the alternating current-direct current power flow transfer of mixed connection section is obtained than matrix D according to following steps in the step 1):
Flexible direct current line power is set to the initial power of pre- installing flexible direct current route first, then by alternating current-direct current mixed connection
Whole routes take turns doing the analysis of N-1 Fault load flow in section, obtain alternating current-direct current power flow transfer than matrix D:
Wherein, D1Indicate the transfer factor matrix between alternating current circuit；D2Indicate flexible direct current route to the transfer factor of alternating current circuit
Matrix；D3Indicate alternating current circuit to the transfer factor matrix of flexible direct current route；D4Indicate the transfer factor between flexible direct current route
Matrix.
3. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
Be characterized in, in the step 2) in the load factor column matrix η of alternating current circuit the i-th row element ηiAre as follows:
Wherein, PiIndicate i-th line road l in alternating current-direct current mixed connection sectioniThe active power of conveying, PiNIndicate route liSpecified function
Rate.
4. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as claimed in claim 3 and its constraint condition,
It is characterized in, the element λ that the i-th row jth arranges in load rate matrix λ in the step 3)ijAre as follows:
Wherein, ηiFor the element of the i-th row in the load factor column matrix η of alternating current circuit, ηjFor the load factor column matrix η of alternating current circuit
The element of middle jth row, DijIt is alternating current-direct current power flow transfer than the element that the i-th row jth in matrix D arranges, PjNFor alternating current-direct current mixed connection section
Middle j-th strip route ljRated power.
5. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
It is characterized in, exchanges the trend of section in the step 5) in the adjustment alternating current-direct current mixed connection section specifically: if load rate matrix λ
Middle greatest member value is greater than 1, then reduces the trend of the exchange section；If loading rate matrix λ greatest member value less than 1, increase
Add the trend of the exchange section.
6. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
It is characterized in, section ability to transmit electricity P is exchanged in the step 6)aAnd its constraint condition is specifically obtained by following steps:
Wherein, P 'iRoute l when being equal to 1 for load rate matrix λ greatest member valueiActive power；
If loading element of the greatest member value equal to 1 in rate matrix λ is λij, then the constraint condition for exchanging section is alternating current circuit lj
Route l after generation N-1 failureiReach rated power.
7. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as claimed in claim 3 and its constraint condition,
It is characterized in, the rated capacity of every flexible direct current is obtained by following steps in the step 7):
First calculate flexible direct current route l in the alternating current-direct current mixed connection sectionpThe load factor column matrix λ of alternating current circuit after disconnectionpIf
Load factor column matrix λpIn greatest member value be located at q row, then flexible direct current route lpRated capacity PpAre as follows:
Wherein, P 'qFor alternating current circuit load factor column matrix λpRoute l when greatest member value is equal to 1qActive power；PqNIndicate line
Road lqRated power, DqpIt is alternating current-direct current power flow transfer than the element that q row pth in matrix D arranges, PpNIndicate flexible direct current route
lpRated power；
As flexible direct current route lpRated capacity PpForWhen, then flexible direct current route lpConstraint condition are as follows: it is flexible straight
Flow Line lpAfter N-1 failure occurs, alternating current circuit lqTransmission power reaches its rated value；
As flexible direct current route lpRated capacity PpFor PpNWhen, then flexible direct current route lpConstraint condition are as follows: flexible direct current line
Road lpRated power be limited by the rated power of installed alternating current circuit.
8. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
It is characterized in, flexible direct current section ability to transmit electricity P in the step 8)dFor the sum of the rated capacity of all flexible direct current routes.
9. the appraisal procedure of multichannel alternating current-direct current mixed connection section ability to transmit electricity as described in claim 1 and its constraint condition,
It is characterized in, alternating current-direct current mixed connection section ability to transmit electricity and constraint condition are specifically obtained by following steps in the step 9):
Firstly, to exchange section ability to transmit electricity PaIt is modified and obtains final exchange maximum transfer power P 'a, and to direct current
Transmission cross-section ability PdIt is finely adjusted and obtains final flexible direct current maximum transfer power P 'd, then according to Pmax=P 'a+P′d
Obtain alternating current-direct current mixed connection section ability to transmit electricity Pmax, the constraint condition of alternating current-direct current mixed connection section are as follows: exchange section constraint condition and
The constraint condition of flexible direct current route.
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