CN109301833A - AC-DC hybrid power grid transmission cross-section overload controlling method based on path removing - Google Patents
AC-DC hybrid power grid transmission cross-section overload controlling method based on path removing 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of AC-DC hybrid power grid transmission cross-section overload controlling methods based on path removing, it include: step 1): monitoring section trend, in case of circuit overload, it carries out direct-current emergency control and provides maximum turn of band ability for overload route, if turning band scarce capacity, transmission path is removed, overload line upstream generator, downstream load are obtained, and judges the minimal negative carrying capacity for making route return to required transfer or excision under safe operation state；Step 2): finding other transmission paths for downstream load power supply, judges that can the maximum in path turn band ability and meet loading demand according to constraint condition, if turning band scarce capacity, enters step 3), otherwise go to step 4)；Step 3): judge that satiable maximum reprinting for amount, cuts off the load that can not be supplied；Step 4): construction objective function；Step 5): objective function is carried out using simplex method to solve acquisition optimal correction amount.
Description
Technical field
The present invention relates to a kind of AC-DC hybrid power grid transmission cross-section overload controlling methods based on path removing, are related to
Power grid power supply technique field.
Background technique
Transmission cross-section Line Flow gets over line, easily causes extensive cascade failure, causes serious consequence.Quickly and effectively control
Measure processed can reduce remaining line power discharge pressure, avoid the generation of serious accident.Direct current transportation has power regulation speed
Fastly, the big advantage of regulation capacity can be promoted and improve large disturbances and impact lower grid power balanced capacity and trend distribution character.
Currently, experts and scholars have been unfolded to study extensively in terms of section premature beats.Existing effective control method can return
Receive as following several classes: 1. Sensitivity Methods: existing technical literature is disclosed using node sensitivity, and power shifts between assessing different sub-network
It is influenced to overload route bring.According to the sequence of Pareto disaggregation and power transfer constraint condition, subnet power transfer amount is calculated,
And the injecting power of each node is updated, until circuit overload phenomenon disappears.Existing technical literature is disclosed to be obtained using DC Model
The critical load and power generation node for influencing line power are sent a control signal to pair after line power is more than given threshold
The load answered or power generation end.On this basis, existing technical literature accounts for the globality of transmission cross-section, structure node pair
It is whole to reduce section branch on the basis of guaranteeing overload Branch Power Flow decline for the sensitivity index for overloading branch and normal branch
Body power transmission total amount.2. constructing objective function with cutting load amount or the minimum target of regulation amount, constrained in system safety operation
On the basis of, solve optimal node control amount.Existing technical literature is introduced penalty factor and is constructed mesh with the minimum target of coincidence loss
Scalar functions preferentially adjust generating set, in the case where no optimal solution, carry out cutting load control.Existing technical literature also constructs
Quiescent voltage constraint and trend constraint function stablize abundant and Steady-State Real Power Security Region by cutset voltage and determine load adjustment collection
It closes.3. superposition states, existing technical literature is pointed out, the method based on sensitivity, calculating process is simple, but cannot achieve
Large-scale power flowcontrol；Control method based on optimization process, because operation complexity can not application on site.Meanwhile existing skill
Art document also proposes a kind of circuit overload emergency control policy based on Tracing power flow algorithm, is obtained using power flow tracing algorithm
Line power composition, the biggish generating set of line fill and load are cut off when circuit overload in proportion.Prior art text
Offering also has the load cutting method based on power flow tracing to combine with the smallest optimal load flow model of active power loss, interleaved computation shape
At Corrective control measure.When power flow transfer causes section to overload, existing method is mainly regulation with nodes such as generator, loads
Object quickly reduces the load uncertainty of overload branch road by cutting machine, cutting load control measure.Although being inherently eliminated
The root that cascading trip occurs, the load for but having ignored the feasible supply path of remaining in network turn band ability, cause unnecessary damage
It loses.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of thought based on path removing is proposed, by guaranteeing
The safety for carrying section is purpose structure constraint condition and objective function, improves alternating current-direct current in the case that Adjusted Option is optimal in path
The AC-DC hybrid power grid transmission cross-section overload controlling method of the nargin of serial-parallel power grid transmission cross-section.
To achieve the above object, the present invention takes following technical scheme: a kind of alternating current-direct current mixed connection electricity based on path removing
Net transmission cross-section overload controlling method, comprising the following steps:
Step 1): monitoring AC-DC hybrid power grid Section Tidal Current of Power Transmission carries out direct-current emergency control in case of circuit overload
Be made as overload route provide it is maximum turn band ability, if turning band scarce capacity, using based on power flow tracing algorithm to transmission path
It is removed, obtains overload line upstream generator, downstream load, and judge to turn needed for returning to route under safe operation state
The minimal negative carrying capacity moved or cut off；
Step 2): finding other transmission paths for downstream load power supply, judges transmission path most according to constraint condition
Can the big band ability that turns meet loading demand, if turning band scarce capacity, go to step 3), otherwise go to step 4)；
Step 3): judge that satiable maximum reprinting for amount, cuts off the load that can not be supplied, adjustment upstream generator goes out
Power；
Step 4): objective function is constructed based on band transmission path workload demand is turned；
Step 5): objective function is carried out using simplex method to solve the optimal correction amount for obtaining each path, that is, is obtained each
The adjustment power of generator.
Further, direct-current emergency control refers to the constant dc power control using the DC line parallel with overload alternating current circuit
Function and DC line overload capacity promote DC line transmission power, if dc power Emergency Assistance can eliminate overload
Route, then adjustment terminates.
Further, constraint condition are as follows:
Generator constraint:
In formula, PGiFor the initial power of generator Gi；ΔPm GiThe generation adjustment amount for being generator Gi in the m of path, works as hair
When electrical power rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pm GiNumerical value is 0；M is institute
There are the path comprising Gi, PGi minAnd PGi maxRespectively limit above and below the active power of generator Gi；G is generator collection in network
It closes；
DC line constraint:
0≤PDC≤1.1PNDC
In formula, PDCFor DC line power, PNDCFor the rated power of direct current；
Load constraint:
In formula, PLjFor the initial power for loading Lj；ΔPn LjTo load generation adjustment amount of the Lj in the n of path, when load function
When rate rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pn LjNumerical value is 0；N is all packets
Path containing Lj.PLj minAnd PLj maxRespectively load the active power of Lj or more limit；L is the collections of loads in network；
Alternating current circuit constraint:
In formula, PTkFor the initial power of route Tk；ΔPq TkThe generation adjustment amount for being route Tk in the q of path, when load function
When rate rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pq TkNumerical value is 0；Q is all packets
Path containing Tk.PTk minAnd PTk maxRespectively limit above and below the active power of path Tk.
Further, the load that excision can not supply is using equal proportion cutting method.
Further, objective function are as follows:
In formula, Δ PxFor the power adjustment of path x；TparSection to be influenced by path adjustment amount overloads route, w
Route is overloaded for certain section；TresFor remaining route in network, v is certain remaining route in network, and α is section nargin coefficient, and β is
Remaining route nargin coefficient, α >=β >=0 are solved in matlab using simplex method, calculate the optimal correction in each path
Measure Δ Px, x=1,2,3 ..., the adjustment power for obtaining each generator adjusts accordingly.
The invention adopts the above technical scheme, which has the following advantages: the present invention is based on power flow tracing algorithm, removings
The whole network transmission path, intuitiveization line power are constituted；When the overload occurs, first carry out dc power emergent control, then into
Row load turns band, is carried out overload route downstream load for power analysis using generator feasible in system and feasible path；
In control process, under the premise of guaranteeing that section tidal current reliably reduces, construction considers the target of section and network overall security
Function obtains Optimal regulation and control scheme using simplex method, improves the safety margin of AC-DC hybrid power grid transmission cross-section.
Detailed description of the invention
Fig. 1 is the process of the AC-DC hybrid power grid transmission cross-section overload controlling method of the invention based on path removing
Figure；
Fig. 2 is the topological structure schematic diagram of east of embodiment of the present invention power grid；
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, the AC-DC hybrid power grid transmission cross-section premature beats side provided by the invention based on path removing
Method, comprising the following steps:
Step 1: monitoring AC-DC hybrid power grid Section Tidal Current of Power Transmission, in case of circuit overload situation, first with straight
The emergent control of power is flowed, promotion dc power carries out power and supports to overload route and providing maximum turn of band ability, is confirmed whether
Overload route can be eliminated (maximum load-carrying capacity less than route is to eliminate overload circuit).If turning band scarce capacity (turns band
Ability: direct current turns band ability to alternating current circuit, and direct current is exactly allowed to undertake the trend of overload AC line, turns band ability and is understood that
For power flow transfer, by overload route to direct current), electric system transmission path is shelled based on existing power flow tracing algorithm
From, obtain overload line upstream generator, downstream load situation.By circuit overload amount, judgement makes route return to safe operation
The minimal negative carrying capacity of required transfer or excision (completely send out, if overload by the generator that can allow rotation standby when practical operation under state
Route still overloads, and at this time then wants cutting load, guarantees that cutting load amount is minimum).
Step 2: finding other transmission paths for downstream load power supply.According to constraint condition, judge that the maximum in path turns
Can band ability meet loading demand, it may be assumed that if the generating set in power grid is mostly in full state, rotation is standby seldom, then
It can not be revolved using generator for being adjusted, eliminate overload route, thought to turn band scarce capacity at this time, then go to step 3, otherwise
Go to step 4；Wherein, constraint condition of the invention is respectively as follows:
(1) generator constrains:
In formula, PGiFor the initial power of generator Gi；ΔPm GiThe generation adjustment amount for being generator Gi in the m of path, works as hair
When electrical power rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pm GiNumerical value is 0；M is institute
There are the path comprising Gi, PGi minAnd PGi maxRespectively limit above and below the active power of generator Gi；G is generator collection in network
It closes；
(2) DC line constrains:
0≤PDC≤1.1PNDC (2)
In formula, PDCFor DC line power, PNDCFor the rated power of direct current；
(3) load constrains:
In formula, PLjFor the initial power for loading Lj；ΔPn LjTo load generation adjustment amount of the Lj in the n of path, when load function
When rate rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pn LjNumerical value is 0；N is all packets
Path containing Lj.PLj minAnd PLj maxRespectively load the active power of Lj or more limit；L is the collections of loads in network；
(4) alternating current circuit constrains:
In formula, PTkFor the initial power of route Tk；ΔPq TkThe generation adjustment amount for being route Tk in the q of path, when load function
When rate rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pq TkNumerical value is 0；Q is all packets
Path containing Tk.PTk minAnd PTk maxRespectively limit above and below the active power of path Tk.
Step 3: judging that satiable maximum is reprinted for amount (it is to reprint for amount that generator, which revolves standby capacity), and press maximum
Load turns band scheme and carries out path adjustment (all generating sets are completely sent out).Meanwhile the load that excision can not supply, it powers by it
Power supply ratio, adjustment upstream generator power output (reduce upstream unit output).Prior art cutting machine, cutting load method carry out
It elaborates, the present invention uses equal proportion cutting method, and detailed process repeats no more.
Step 4: turning band transmission path can satisfy workload demand, or even there are in the case where allowance, carry out path adjustment
Planning.Assuming that the power variation in each path is △ Px, x=1,2,3 ..., path adjustment objective function is obtained by formula (8).
Objective function are as follows:
In formula, Δ PxFor the power adjustment of path x；TparSection to be influenced by path adjustment amount overloads route, w
Route is overloaded for certain section；TresFor remaining route in network, v is certain remaining route in network, and α is section nargin coefficient, and β is
Remaining route nargin coefficient, α >=β >=0 are solved in matlab using simplex method, calculate the optimal correction in each path
Measure Δ Px, x=1,2,3 ..., the adjustment power for obtaining each generator adjusts accordingly.
Step 5: objective function is solved using existing simplex method, calculates the optimal correction amount in each path, and
The adjustment power for obtaining each generator, adjusts accordingly.
Step 6: after adjustment, coming back to power flow monitor link, continue the safety for monitoring and ensuring electric system
Stable operation.
It is disconnected below by the specific embodiment AC-DC hybrid power grid transmission of electricity based on path removing that the present invention will be described in detail
Face overload controlling method.
As shown in Fig. 2, the present embodiment uses east somewhere power grid geographical wiring diagram, this power grid is obtained by isolated-phase buses
Geographical wiring diagram one shares 15 nodes, and route L4, L5, L6 constitute generator G1 and convey section to the power of load area.Certain
Route L5 surprisingly breaks when interconnection overhauls, and the power rise of the route L6 on same section gets over line, and influences system and stablize, this
The Shi Caiyong AC-DC hybrid power grid transmission cross-section overload controlling method of the invention based on path removing can eliminate overload line
Road maintains the stabilization of system, specific control process are as follows:
Step 1: circuit overload situation occurs for route L6, and progress dc power Emergency Assistance promotion 130MW first be (direct current
Urgent power ascension can realize that the objective for implementation of the present embodiment is the direct current of route L4 by corresponding control strategy, by straight
The maximum capacity of stream is adjusted), if it find that overload route cannot be eliminated.Power flow tracing algorithm is then based on to transmission line of electricity
It is removed (principle of the present embodiment removing separates each transmission path from generator to load), on analysis overload route
Swim generator, downstream load situation.By circuit overload amount, then judgement makes route return to required transfer under safe operation state
Or the minimal negative carrying capacity (route also overloads cutting load again after generator is completely sent out, and the amount than direct cutting load is few at this time) of excision,
At this time the active power on each route and maximum can load power it is as shown in table 1, transmission path peel results are as shown in table 2:
1 route active power of table and maximum can load powers
2 path peel results of table
Step 2: the upstream generator for overloading path is G1, downstream load P1, P2, P3 and P4.If being restored to power
Within route ability to bear, then route L6 should also reduce 100MW power.Other transmission paths for downstream load power supply are found,
According to constraint condition, judge that can the maximum in path turn band ability and meet loading demand.
Step 3: judging that satiable maximum reprinting turns band scheme progress path adjustment for amount, and by maximum load.
Assuming that the equal full-load run of generator G1, G3, G4, G5 in network, active power sending amount be respectively 1016MW,
242.2MW, 250MW and 480MW.Generator G2 issues active 350MW, retains the quick start margin of power of 60MW.By constraining
The load that condition can immediately arrive at remaining path turns band ability, i.e. G2 can provide 60MW to P3 via transmission path 22,23 more to be had
Function power.This turn of band ability, which is unable to satisfy section overload route L6 power, reduces demand.At this point, directly turning band scheme by maximum
Path adjustment (cutting load again after the standby all investments of rotation) is carried out, is performed simultaneously and cuts machine-cut load plan.The present embodiment is directly to downstream
Load carry out equal proportion excision, cut off load total amount 40MW, load P1, P2, P3 and P4 excision load be respectively 12.3MW,
5.6MW, 8.4MW, 13.6MW, after control flow, overload disappears, and each line power value is as shown in table 3 after excision:
3 route active power of table
Step 4: turning the case where belt path is optimized and revised for load.
Assuming that there was only generator G4, G5 full-load run in network, active power sending amount is respectively 250MW and 480MW.
Generator G2 active power output 350MW, retains the quick start margin of power of 200MW.Generator G3 active power output 155MW retains
The quick start margin of power of 160MW.The load known to path constraints, which turns band ability, can satisfy section overload route function
Rate reduces demand.If the power adjustment in each path is respectively △ Pi, i=1,2,3 ... 23, i is path number, with wherein, △
P1, △ P2, △ P5, △ P6, △ P11, △ P12, △ P14 are downward amount, remaining is up-regulation amount.Section security performance is considered, if α
=1.5, β=1 constructs objective function, after arrangement are as follows:
Max.G=0.017236 (Δ P1+ΔP2)+0.016285(ΔP5+ΔP6)
+0.015887(ΔP11+ΔP12)+0.002609ΔP14
-0.007274(ΔP15+ΔP16)-0.012183ΔP17
-0.010305ΔP18-0.003125ΔP20-0.002174ΔP21
-0.002915(ΔP22+ΔP23)-0.0011249(ΔP24+ΔP25)
-0.009354(ΔP26+ΔP27)+3.4355 (9)
s.t.-72.4≤ΔP1+ΔP5-ΔP15-ΔP16-ΔP24-ΔP26≤168.6 (10)
-72.4≤ΔP2+ΔP6-ΔP17-ΔP18-ΔP11-ΔP25-ΔP27≤168.6 (11)
-40.6≤ΔP1+ΔP2+ΔP5≤135 (12)
100≤ΔP1+ΔP2+ΔP5+ΔP6+ΔP11+ΔP12+ΔP14≤575 (13)
-57.8≤ΔP9+ΔP10+ΔP11+ΔP12≤193 (14)
-96≤ΔP1+ΔP2-ΔP15-ΔP16-ΔP17-ΔP18-ΔP20≤320 (15)
-138≤ΔP5+ΔP6-ΔP21-ΔP24-ΔP25-ΔP26-ΔP27≤460 (16)
-103≤ΔP9+ΔP11-ΔP22≤343 (17)
-103≤ΔP10+ΔP12-ΔP23≤343 (18)
-61≤-ΔP15-ΔP17-ΔP24-ΔP25≤203 (19)
ΔP19=0 (20)
ΔP20+ΔP21=0 (21)
ΔP22+ΔP23≤200 (22)
ΔP15+ΔP16+ΔP17+ΔP18≤160 (23)
-ΔP1-ΔP2-ΔP3-ΔP4+ΔP15+ΔP16+ΔP19+ΔP20=0 (24)
-ΔP5-ΔP6-ΔP7-ΔP8+ΔP17+ΔP18+ΔP21=0 (25)
-ΔP9-ΔP10-ΔP11-ΔP12+ΔP22+ΔP23=0 (26)
ΔP13=0 (27)
ΔP14=0 (28)
In formula, each Δ P is the adjustment amount of route active power.
In above-mentioned constraint condition, formula (10) to formula (19) is path constraint, and formula (20) to formula (23) is respectively each generator
Active constraint, formula (24) to formula (28) are load constraint；
Step 5: this linear programming problem being solved using simplex method.
Wherein, 4 paths need to carry out power adjustment, calculated result: △ P11=△ P12=△ P22=△ P23=
87.75.Then power adjustment are as follows: generator G1 power reduces 175.5MW, generator G2 power ascension 175.5MW.Adjustment terminates
Afterwards, route power variation in network are as follows:
4 route active power variable quantity of table
Step 6: overloading line power after adjustment and be substantially reduced, route active power is restored to 501.4MW, can lower than route
Undertake maximum power.The biggish route of changed power is L4, L7 and L8.Through analysis it is found that these line electricity sources are constituted more
It is single, i.e., it powers from generator G1 to load area.When section factor is higher than non-section factor, section power stream occurs significant
Decline, section downstream area route are similarly subjected to more significantly influence.Nargin objective function calculated result adjusted is
5.7121, power needed for loading zone is become being provided by generator G2 from generator G1 offer.After adjustment, control system will again
Power flow monitor link is returned to, the safe and stable operation for monitoring and ensuring system is continued.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out change and modification appropriate.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.In addition, although this specification
In use some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (5)
1. a kind of AC-DC hybrid power grid transmission cross-section overload controlling method based on path removing, it is characterised in that including following
Step:
Step 1): monitoring AC-DC hybrid power grid Section Tidal Current of Power Transmission, in case of circuit overload, carrying out direct-current emergency control is
Route offer maximum is provided and turns band ability, if turning to carry out transmission path using power flow tracing algorithm is based on scarce capacity
Removing, obtain overload line upstream generator, downstream load, and judge make route return under safe operation state it is required transfer or
The minimal negative carrying capacity of excision；
Step 2): finding other transmission paths for downstream load power supply, judges that the maximum of transmission path turns according to constraint condition
Can band ability meet loading demand, if turning band scarce capacity, go to step 3), otherwise go to step 4)；
Step 3): judge that satiable maximum reprinting for amount, cuts off the load that can not be supplied, adjustment upstream generator power output；
Step 4): objective function is constructed based on band transmission path workload demand is turned；
Step 5): objective function is carried out using simplex method to solve the optimal correction amount for obtaining each path, that is, obtains each power generation
The adjustment power of machine.
2. the AC-DC hybrid power grid transmission cross-section overload controlling method according to claim 1 based on path removing,
It is characterized in that, direct-current emergency control, which refers to, utilizes constant dc power control function with the parallel DC line in overload alternating current circuit and straight
Flow Line overload capacity promotes DC line transmission power, if dc power Emergency Assistance can eliminate overload route,
Adjustment terminates.
3. the AC-DC hybrid power grid transmission cross-section overload controlling method according to claim 1 based on path removing,
It is characterized in that, constraint condition are as follows:
Generator constraint:
In formula, PGiFor the initial power of generator Gi；ΔPm GiThe generation adjustment amount for being generator Gi in the m of path, when power generation function
When rate rises, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pm GiNumerical value is 0；M is all packets
Path containing Gi, PGi minAnd PGi maxRespectively limit above and below the active power of generator Gi；G is generator collection in network；
DC line constraint:
0≤PDC≤1.P1NDC
In formula, PDCFor DC line power, PNDCFor the rated power of direct current；
Load constraint:
In formula, PLjFor the initial power for loading Lj；ΔPn LjTo load generation adjustment amount of the Lj in the n of path, when in bearing power
When rising, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pn LjNumerical value is 0；It includes Lj that N, which is all,
Path.PLj minAnd PLj maxRespectively load the active power of Lj or more limit；L is the collections of loads in network；
Alternating current circuit constraint:
In formula, PTkFor the initial power of route Tk；ΔPq TkThe generation adjustment amount for being route Tk in the q of path, when in bearing power
When rising, adjustment amount is positive number, falls to negative, if not adjusting in the path, Δ Pq TkNumerical value is 0；It includes Tk that Q, which is all,
Path.PTk minAnd PTk maxRespectively limit above and below the active power of path Tk.
4. described in any item AC-DC hybrid power grid transmission cross-sections based on path removing overload control according to claim 1~3
Method processed, which is characterized in that the load that excision can not supply is using equal proportion cutting method.
5. described in any item AC-DC hybrid power grid transmission cross-sections based on path removing overload control according to claim 1~3
Method processed, which is characterized in that objective function are as follows:
In formula, Δ PxFor the power adjustment of path x；TparSection to be influenced by path adjustment amount overloads route, and w is disconnected for certain
Overload route in face；TresFor remaining route in network, v is certain remaining route in network, and α is section nargin coefficient, and β is remaining line
Road nargin coefficient, α >=β >=0 are solved in matlab using simplex method, calculate the optimal correction amount Δ P in each pathx,
X=1,2,3 ..., the adjustment power for obtaining each generator adjusts accordingly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969652A (en) * | 2020-07-08 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Multi-direct-current cooperative control method and device for eliminating overload of alternating-current line of receiving-end power grid |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN111969652A (en) * | 2020-07-08 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Multi-direct-current cooperative control method and device for eliminating overload of alternating-current line of receiving-end power grid |
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| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN109301833B (en) | 2021-11-16 |
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