CN107276083B - A kind of alternating current-direct current power grid progress control method towards energy internet - Google Patents
A kind of alternating current-direct current power grid progress control method towards energy internet Download PDFInfo
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- CN107276083B CN107276083B CN201710579492.8A CN201710579492A CN107276083B CN 107276083 B CN107276083 B CN 107276083B CN 201710579492 A CN201710579492 A CN 201710579492A CN 107276083 B CN107276083 B CN 107276083B
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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
-
- 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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
-
- 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
-
- 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
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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]
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of alternating current-direct current power grid progress control method towards energy internet, wherein alternating current-direct current power grid includes: AC system, direct current net and converter station；Each AC system accesses direct current net by converter station, and multiple AC systems are interconnected by direct current net, and wherein method carries out service ability analysis, main website switching control and multiterminal corrdinated adjustment.The method of the present invention is analyzed by service ability determines that direct current net controls main website, and the control model of each converter station is quickly adjusted by main website switching control, ensures that the constant stable power with AC load of DC voltage is supplied.Side line load is further exchanged by converter station each after the switching control of multiterminal corrdinated adjustment equilibrium main website, avoids occurring alternating current circuit or transformer heavy duty, the power supply capacity of effective lifting system, with wide development and application prospect because of pattern switching.
Description
Technical field
The present invention relates to a kind of alternating current-direct current power grid progress control method towards energy internet, belongs to operation of power networks technology
Field.
Background technique
Traditional power grid traffic control technology can not carry out various energy resources flexibly, efficiently to manage, and be unable to satisfy extensive
Distributed energy accesses the high request to operation of power networks stability and economy, needs from the angle of Regional Energy internet
Comprehensively consider the coordinated operation of each distributed energy, and then establishes solid reason for the comprehensive utilization of energy of future source of energy internet
By basis and technological means.
The friendship of direct current supply technology can reduce ac-dc conversion link, and loss is effectively reduced, improves system effectiveness, based on friendship
The energy internet of direct current mixing distribution is to solve one of existing power distribution network important means of problems, towards energy internet
Alternating current-direct current power grid use multiterminal interconnection architecture, AC network interconnected by direct current multiterminal, and can mutually be supported balanced
The load of different zones avoids alternating current circuit or transformer overload, improves whole operational reliability, meanwhile, when converter station is transported
It can ensure that stablizing for each region of AC and DC supplies when row patterns of change or certain end AC system exception by multiterminal coordination
Electricity, the power supply capacity of effective lifting system.Multiterminal coordinated operation becomes one of the critical function of system call management.
Summary of the invention
The technology of the present invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of alternating current-direct current towards energy internet
Operation of power networks control method can effectively promote bulk supply ability and operational efficiency significantly.
The technology of the present invention solution: a kind of alternating current-direct current power grid progress control method towards energy internet, it is described
Alternating current-direct current power grid includes AC system, direct current net and converter station.The converter station, that is, AC/DC bidirectional converter, converter station
Control model include control DC bus-bar voltage mode, control active/reactive power mode, control alternating voltage/frequency mould
Formula (is subdivided into typical AC constant voltage constant frequency control model and the sagging control model of exchange etc.).AC system passes through converter station
Direct current net is accessed, multiple AC systems are interconnected by direct current net.Wherein: direct current net include DC load, dc circuit breaker and
DC line, wherein DC line accesses the DC side of converter station, and DC load is connected by dc circuit breaker and DC line
It connects.
The AC system includes alternating current circuit, AC circuit breaker, AC load, AC transformer and ac bus.
Wherein, ac bus accesses AC transformer by alternating current circuit, and AC load is accessed by AC circuit breaker and alternating current circuit
Ac bus, and side is exchanged by AC circuit breaker and alternating current circuit access converter station.
Steps are as follows for the progress control method:
(1) service ability is analyzed
When being generated by alternating current-direct current power grid operation control system, certain converter station actively turns to supply or early warning finds certain alternating current circuit
There is exception, when needing to disconnect exchange side line road, starts operating analysis, by dividing each converter station current operating conditions
Analysis, calculates respective permission working capacity, further calculates respective priority valve on this basis, determine that minimum value is corresponding
Converter station is main website, and the main website refers to that main website is in system operation using the converter station of control DC bus-bar voltage mode
Undertake the normal work of entire direct current net；
(2) main website switching control
It switches to control when being originally used for the converter station of main website and hands over due to active conversion or due to the early warning needs that note abnormalities
Galvanic electricity pressure/frequency mode needs to select in other converter stations when providing the support to AC system without being re-used as main website
Main website out maintains the normal operation of alternating current-direct current power grid；
(3) multiterminal corrdinated adjustment
After main website switching, alternating current-direct current power grid not may operate in Optimal State, the corresponding AC line of some converter stations
Road heavy duty, the corresponding route underloading of some converter stations, needs to readjust and shift by the power between each converter station, from
Light-loaded circuit absorbs Partial Power and injects heavy-haul line, and each converter station exchanges side line load after balanced main website switching control, keeps away
Exempt from occur alternating current circuit or AC transformer heavy duty, the power supply capacity of effective lifting system because of pattern switching.
The specific implementation steps are as follows for service ability analysis in the step (1):
Step 11: alternating current-direct current power grid operation control system obtains the operation data of n-th of converter station and alternating current circuit, under
Marking n indicates any value of converter station number, and value range is 1~N, and N is converter station total quantity, that is, alternating current circuit total quantity；It obtains
The corresponding static parameter of each converter station, the static parameter includes the rated capacity S of each converter stationC1,rated,
SC2,rated...SCn,rated...SCN,ratedWith safe operation load factor ηC1,ηC2...ηCn...ηCN, each alternating current circuit transformer
Rated capacity ST1,rated,ST2,rated...STn,rated...STN,ratedWith safe operation load factor ηT1,ηT2...ηTn...ηTN；
And dynamic operation power parameter, dynamic operation power parameter include each converter station exchange active-power PC1,
PC2...PCn...PCN, exchange reactive power QC1,QC2...QCn...QCN；And the total active power of load of each alternating current circuit
PT1,ac,PT2,ac...PTn,ac...PTN,ac, total reactive power QT1,ac,QT2,ac...QTn,ac...QTN,ac；And it is straight in direct current net
The total load value P of current loaddc；
Step 12: obtaining the corresponding converter station number of the converter station for needing actively to turn to supply or abnormal alternating current circuit, number
For i, then it is set as i-th of converter station, calculates the working capacity of other each converter stations, if working capacity, which is greater than zero, indicates power
It is on the contrary then exchange side from DC side flow direction from exchange effluent to DC side；The permission positive of n-th of converter station when calculating permits
Perhaps negative power, wherein the permission positive P of n-th of converter stationCn,+It indicates, the permission negative power P of n-th of converter stationCn,-
It indicates, PCn,-Calculation formula are as follows:
And it calculates:
If PCn,maxavaible, n ≠ i value is less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=0, n ≠ i
If PCn,maxavaible, n ≠ i value is not less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=min (PCn,maxavaible,SCn,ratedηCn), n ≠ i
Step 13: picking out other than i-th of converter station and meet PCn,+It is pre- to form main website for all converter stations of > 0, n ≠ i
Selected works close, and setting m indicates any value of the number of the converter station in the set, in calculating main website pre-candidate set in each converter station most
Big safe operation load S:
S=max { SCm,ratedηCm}
Calculate the factor alpha of m-th of converter station in main website pre-candidate setm:
Calculate the α of each converter station in main website pre-candidate setmIn maximum value A:
A=max { αm}
Further calculate the factor beta of m-th of converter station in main website pre-candidate setm:
Calculate the β of each converter station in main website pre-candidate setmIn maximum value B:
B=max { βm}
Finally calculate the priority valve d of each converter station in main website pre-candidate setm:
Select the d of each converter station in main website pre-candidate setmIn the corresponding converter station of minimum value be main website, it is assumed that be jth
A converter station.
Main website switching realizes that steps are as follows in the step (2):
Step 21. alternating current-direct current power grid operation control system scans the control model of i-th of converter station, is judged: if
For the main website for controlling DC bus-bar voltage mode, 22 are thened follow the steps, no to then follow the steps 23:
Step 22. alternating current-direct current power grid operation control system assigns j-th of converter station and is switched to control DC bus-bar voltage mould
The non-main website that i-th of converter station is switched to the active/reactive power mode of control is simultaneously assigned by the main website of formula, wherein active power refers to
Definite value PCi, reactive power QCiCurrent value is maintained, without modification, executes step 23；
The open-circuit line that step 23. alternating current-direct current power grid operation control system assigns i-th of alternating current circuit breaker instructs, simultaneously
I-th of converter station is assigned to be switched under control alternating voltage/frequency mode, including AC constant voltage constant frequency control model and exchange
The instruction for control model of hanging down.
Specific step is as follows for step (3) the multiterminal corrdinated adjustment:
Step 31. alternating current-direct current power grid operation control system updates dynamic operation power data, and the data are changed comprising n-th
Flow the P at stationCn, QCnAnd the P of n-th of alternating current circuitTn,ac, QTn,acAnd Pdc；
Step 32. ignores inverter running wastage using balanced each alternating current circuit load factor λ as cooperative scheduling target, it may be assumed that
Further calculate the value and power reference P that n-th of converter station needs to adjustCn,ref:
If PCn,ref< 0, n ≠ i, n ≠ j, PCn,refIt is modified to
If PCn,ref>=0, n ≠ i, n ≠ j, PCn,refIt is modified to
If step 33. judgesThe then new power command value P of each converter stationCn,newref
γ in proportion1It is adjusted as follows:
IfThe then new power command value P of each converter stationCn,newrefγ in proportion2Into
Row is adjusted:
Otherwise the new power command value P of each converter stationCn,newrefMeet:
Step 34. alternating current-direct current power grid operation control system assigns each PCn,newref, n ≠ i, n ≠ j to i-th, j converter station with
All converter stations of outer correspondence realize multiterminal corrdinated adjustment.
The advantages of the present invention over the prior art are that:
(1) control method of the present invention is analyzed by service ability determines that direct current net controls main website, and is switched by main website and controlled
System quickly adjusts the control model of each converter station, ensures that the constant stable power with AC load of DC voltage is supplied.Further
Side line load is exchanged by converter station each after the switching control of multiterminal corrdinated adjustment equilibrium main website, avoids handing over because of pattern switching
Flow Line or transformer heavy duty, the power supply capacity of effective lifting system.
(2) present invention fills up technological gap, has wide development and application prospect.
Detailed description of the invention
Fig. 1 is the typical structure diagram of the alternating current-direct current power grid of the invention towards energy internet；
Fig. 2 is the alternating current-direct current power grid progress control method flow chart of the invention towards energy internet；
Fig. 3 is that the service ability in the present invention analyzes work flow diagram；
Fig. 4 is the main website switching control work flow diagram in the present invention；
Fig. 5 is the multiterminal corrdinated adjustment work flow diagram in the present invention.
Specific embodiment
As shown in Figure 1, the alternating current-direct current power grid towards energy internet includes AC system, direct current net and converter station.Institute
The converter station stated uses AC/DC bidirectional converter, and the control model of converter station has comprising control DC bus-bar voltage mode, control
Function/reactive power mode, control alternating voltage/frequency mode (are subdivided into typical AC constant voltage constant frequency control model and friendship
Flow down vertical control model etc.).AC system accesses direct current net by converter station, and multiple AC systems are interconnected by direct current net.Its
In: direct current net includes DC load, dc circuit breaker and DC line, wherein the direct current of DC line access converter station
Side, DC load are connect by dc circuit breaker with DC line.
AC system includes alternating current circuit, AC circuit breaker, AC load, AC transformer and ac bus.Wherein, it hands over
It flows bus and AC transformer is accessed by alternating current circuit, AC load exchanges mother with alternating current circuit access by AC circuit breaker
Line, and side is exchanged by AC circuit breaker and alternating current circuit access converter station.
As shown in Fig. 2, a kind of alternating current-direct current power grid progress control method step towards energy internet proposed by the present invention
It is as follows:
(1) service ability is analyzed
Control DC bus-bar voltage (is responsible for using the converter station of control DC bus-bar voltage mode in alternating current-direct current power grid
Converter station) it is main converter station (abbreviation main website), the normal work of entire direct current net is undertaken in system operation, plays pass
Key effect.By analyzing each converter station current operating conditions, calculate respective permission working capacity, on this basis into
One step calculates respective priority valve, determines that the corresponding converter station of minimum value is main website.
As shown in figure 3, specific step is as follows for service ability analysis:
Step 1. ought be generated certain converter station by alternating current-direct current power grid operation control system and actively turn to supply or sent out by system early warning
When abnormal needs disconnection exchange side line road occurs in certain existing alternating current circuit, it is transferred to step 2.
Step 2. alternating current-direct current power grid operation control system obtains the operation number of n-th of converter station and alternating current circuit transformer
According to (subscript n indicates any value of converter station number, and value range is 1~N, and N is converter station total quantity, that is, alternating current circuit sum
Amount), corresponding static parameter is obtained, the rated capacity S comprising each converter stationC1,rated,SC2,rated...SCn, rated...SCN,ratedWith safe operation load factor ηC1,ηC2...ηCn...ηCN, the specified appearance comprising each alternating current circuit transformer
Measure ST1,rated,ST2,rated...STn,rated...STN,ratedWith safe operation load factor ηT1,ηT2...ηTn...ηTN；And dynamic
Power data is run, exchanges active-power P comprising each converter stationC1,PC2...PCn...PCN, exchange reactive power QC1,
QC2...QCn...QCN；And the total active-power P of load of each alternating current circuitT1,ac,PT2,ac...PTn,ac...PTN,ac, total idle
Power QT1,ac,QT2,ac...QTn,ac...QTN,ac；And the total load value P of the DC load in direct current netdc.It is transferred to step 3.
Step 3. obtains the corresponding converter station number of the converter station for needing actively to turn to supply or abnormal alternating current circuit, and number is
I is then set as i-th of converter station, and calculating the working capacities of other each converter stations, (being greater than zero indicates power from exchange effluent to straight
Flow side, on the contrary then flow to exchange side from DC side), calculate permission positive, the permission negative power of n-th of converter station, wherein the
The permission positive P of n converter stationCn,+It indicates, the permission negative power P of n-th of converter stationCn,-It indicates, PCn,-Calculation formula
Are as follows:
And it calculates:
If PCn,maxavaible, n ≠ i value is less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=0, n ≠ i
If PCn,maxavaible, n ≠ i value is not less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=min (PCn,maxavaible,SCn,ratedηCn), n ≠ i
After calculating, it is transferred to step 4.
Step 4. is picked out other than i-th of converter station and meets PCn,+It is pre- to form main website for all converter stations of > 0, n ≠ i
Selected works close, and setting m indicates any value of the number of the converter station in the set.In calculating main website pre-candidate set in each converter station most
Big safe operation load S:
S=max { SCm,ratedηCm}
Calculate the factor alpha of m-th of converter station in main website pre-candidate setm:
Calculate the α of each converter station in main website pre-candidate setmIn maximum value A:
A=max { αm}
Further calculate the factor beta of m-th of converter station in main website pre-candidate setm:
Calculate the β of each converter station in main website pre-candidate setmIn maximum value B:
B=max { βm}
Finally calculate the priority valve d of each converter station in main website pre-candidate setm:
Select the d of each converter station in main website pre-candidate setmIn the corresponding converter station of minimum value (it is assumed that j-th of change of current
Stand), it is determined as main website.
(2) main website switching control
Main website plays a key effect in system operation.When being originally used for the converter station of main website due to active conversion and control
Mode needs to switch to control alternating voltage/frequency mode since system early warning notes abnormalities to provide to AC system
When support is without being re-used as main website, need to select main website in other converter stations, to maintain the normal operation of system.
As shown in figure 4, specific step is as follows for main website switching control:
Step 1. alternating current-direct current power grid operation control system scans the control model of i-th of converter station, is judged: if it is
The main website for controlling DC bus-bar voltage mode, thens follow the steps 2, no to then follow the steps 3:
Step 2. alternating current-direct current power grid operation control system assigns j-th of converter station and is switched to control DC bus-bar voltage mode
Main website and assign i-th of converter station and be switched to the non-main website for controlling active/reactive power mode, wherein active power is specified
Value PCi, reactive power QCiCurrent value is maintained, without modification.Execute step 3.
The open-circuit line that step 3. alternating current-direct current power grid operation control system assigns i-th of alternating current circuit breaker instructs, simultaneously
Assign i-th of converter station be switched to control alternating voltage/frequency mode (such as AC constant voltage constant frequency control model and exchange it is sagging
Control model etc.) instruction.
(3) multiterminal corrdinated adjustment
After main website switching, system not may operate in Optimal State, the corresponding alternating current circuit heavy duty of some converter stations,
Some converter stations corresponding route underloading, needs to readjust by the power between each converter station and transfer, such as from light
It carries route and absorbs Partial Power injection heavy-haul line, each converter station exchanges side line load after balanced main website switching control, avoids
Because there is alternating current circuit or transformer heavy duty, the power supply capacity of effective lifting system in pattern switching.
As shown in figure 5, specific step is as follows for multiterminal corrdinated adjustment:
Step 1. alternating current-direct current power grid operation control system updates dynamic operation power data, the P comprising n-th of converter stationCn,
QCnAnd the P of n-th of alternating current circuitTn,ac, QTn,acAnd Pdc.It is transferred to step 2.
Step 2. ignores inverter running wastage using balanced each alternating current circuit load factor λ as cooperative scheduling target, it may be assumed that
Further calculate the value and power reference P that n-th of converter station needs to adjustCn,ref:
If PCn,ref< 0, n ≠ i, n ≠ j, PCn,refIt is modified to
If PCn,ref>=0, n ≠ i, n ≠ j, PCn,refIt is modified to
It is transferred to step 3.
If step 3. judgesThe then new power command value P of each converter stationCn,newrefIt presses
Ratio γ1It is adjusted:
IfThe then new power command value P of each converter stationCn,newrefγ in proportion2Into
Row is adjusted:
Otherwise the new power command value P of each converter stationCn,newrefMeet:
Step 4. alternating current-direct current power grid operation control system assigns each PCn,newref, n ≠ i, n ≠ j to i-th, j converter station with
All converter stations of outer correspondence realize multiterminal corrdinated adjustment.
Above embodiments are provided just for the sake of the description purpose of the present invention, and are not intended to limit the scope of the invention.This
The range of invention is defined by the following claims.It does not depart from spirit and principles of the present invention and the various equivalent replacements made and repairs
Change, should all cover within the scope of the present invention.
Claims (4)
1. a kind of alternating current-direct current power grid progress control method towards energy internet, it is characterised in that: described towards energy source interconnection
The alternating current-direct current power grid of net, comprising: AC system, direct current net and converter station；Each AC system accesses direct current by converter station
Net, multiple AC systems are interconnected by direct current net；Converter station work when control model include control DC bus-bar voltage mode,
Active/reactive power mode, control alternating voltage/frequency mode are controlled, control alternating voltage/frequency mode is divided into AC constant voltage
Constant frequency control model and the sagging control model of exchange；Wherein:
The direct current net includes: DC load, dc circuit breaker and DC line, and DC line accesses the DC side of converter station,
DC load is connect by dc circuit breaker with DC line；
Each AC system includes: alternating current circuit, AC circuit breaker, AC load, AC transformer and ac bus；It hands over
It flows bus and AC transformer is accessed by alternating current circuit, AC load exchanges mother with alternating current circuit access by AC circuit breaker
Line, and side is exchanged by AC circuit breaker and alternating current circuit access converter station；
Steps are as follows for the progress control method:
The analysis of step (1) service ability
When being generated by alternating current-direct current power grid operation control system, certain converter station actively turns to supply or early warning finds that certain alternating current circuit occurs
It is abnormal, when needing to disconnect exchange side line road, start operating analysis, by analyzing each converter station current operating conditions, counts
Respective permission working capacity is calculated, further calculates respective priority valve on this basis, determines the corresponding change of current of minimum value
Standing is main website, and the main website refers to that the converter station using control DC bus-bar voltage mode, main website undertake in system operation
The normal work of entire direct current net；
The switching control of step (2) main website
Control alternating current is switched to due to active conversion or due to the early warning needs that note abnormalities when being originally used for the converter station of main website
Pressure/frequency mode needs to select master in other converter stations when providing the support to AC system without being re-used as main website
It stands, maintains the normal operation of alternating current-direct current power grid；
Step (3) multiterminal corrdinated adjustment
After main website switching, alternating current-direct current power grid not operates in Optimal State, and the corresponding alternating current circuit heavy duty of some converter stations has
The corresponding route underloading of converter station a bit needs to readjust and shift by the power between each converter station, from light-loaded circuit
It absorbs Partial Power and injects heavy-haul line, each converter station exchanges side line load after balanced main website switching, avoids because of pattern switching
There is alternating current circuit or AC transformer heavy duty, the power supply capacity of effective lifting system.
2. the alternating current-direct current power grid progress control method according to claim 1 towards energy internet, it is characterised in that: institute
Stating service ability analysis in step (1), the specific implementation steps are as follows:
Step 11: alternating current-direct current power grid operation control system obtains the operation data of n-th of converter station and alternating current circuit, subscript n
Indicate any value of converter station number, value range is 1~N, and N is converter station total quantity；It is corresponding quiet to obtain each converter station
State parameter, the static parameter include the rated capacity S of N number of converter stationC1,rated,SC2,rated...SCn,rated...SCN,rated, N
The safe operation load factor η of a converter stationC1,ηC2...ηCn...ηCN, the rated capacity S of N number of alternating current circuit transformerT1,rated,
ST2,rated...STn,rated...STN,rated, the safe operation load factor η of N number of alternating current circuit transformerT1,ηT2...ηTn...ηTN,
Dynamic operation power parameter includes N number of converter station exchange active-power PC1,PC2...PCn...PCN, the idle function of N number of converter station exchange
Rate QC1,QC2...QCn...QCN, the total active-power P of the load of N number of alternating current circuitT1,ac,PT2,ac...PTn,ac...PTN,ac, N number of friendship
Total reactive power Q of Flow LineT1,ac,QT2,ac...QTn,ac...QTN,acAnd the total load value of the DC load in direct current net
Pdc；
Step 12: it obtains and needs the corresponding converter station number of the actively turn converter station supplied or abnormal alternating current circuit, number i,
Then it is set as i-th of converter station, calculates the working capacity of other each converter stations, indicates power from friendship if working capacity is greater than zero
Flow effluent to DC side, it is on the contrary then exchange side from DC side flow direction；It calculates the permission positive of n-th of converter station, allow negative work
Rate, wherein the permission positive P of n-th of converter stationCn,+It indicates, PCn,+Indicate the permission positive of n-th of converter station, n-th
The permission negative power P of a converter stationCn,-It indicates, PCn,-Indicate the permission negative power of n-th of converter station, PCn,-Calculation formula are as follows:
And calculate PCn,maxavaible, wherein PCn,maxavaibleIndicate the maximum available power of n-th of converter station:
If PCn,maxavaible, n ≠ i value is less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=0, n ≠ i
If PCn,maxavaible, n ≠ i value is not less than zero, the permission positive P of n-th of converter stationCn,+Calculation formula are as follows:
PCn,+=min (PCn,maxavaible,SCn,ratedηCn), n ≠ i
Step 13: picking out other than i-th of converter station and meet PCn,+All converter stations of > 0, n ≠ i form the pre- selected works of main website
It closes, setting m indicates any value of the number of the converter station in the set, calculates the maximum peace in main website pre-candidate set in each converter station
Row for the national games loads S:
S=max { SCm,ratedηCm}
Calculate the factor alpha of m-th of converter station in main website pre-candidate setm:
PCm,+Indicate the permission positive of m-th of converter station, PCmIndicate that m-th of converter station exchange active power calculates main website pre-selection
The α of each converter station in setmIn maximum value A:
A=max { αm}
Further calculate the factor beta of m-th of converter station in main website pre-candidate setm:
PCm,-It indicates the permission negative power of m-th of converter station, calculates the β of each converter station in main website pre-candidate setmIn maximum value B:
B=max { βm}
Finally calculate the priority valve d of each converter station in main website pre-candidate setm:
Select the d of each converter station in main website pre-candidate setmIn the corresponding converter station of minimum value be main website, it is assumed that be j-th of change of current
It stands.
3. the alternating current-direct current power grid progress control method according to claim 1 towards energy internet, it is characterised in that: institute
It states main website switching in step (2) and realizes that steps are as follows:
Step 21. alternating current-direct current power grid operation control system scans the control model of i-th of converter station, is judged: if it is control
The main website of DC bus-bar voltage mode processed, thens follow the steps 22, no to then follow the steps 23；
Step 22. alternating current-direct current power grid operation control system assigns j-th of converter station and is switched to control DC bus-bar voltage mode
The non-main website that i-th of converter station is switched to the active/reactive power mode of control is simultaneously assigned by main website, wherein active power designated value
PCi, reactive power QCiCurrent value is maintained, without modification, executes step 23；
The open-circuit line that step 23. alternating current-direct current power grid operation control system assigns i-th of alternating current circuit breaker is instructed and is assigned
I-th of converter station is switched to control alternating voltage/frequency mode, including AC constant voltage constant frequency control model and the sagging control of exchange
The instruction of molding formula.
4. the alternating current-direct current power grid progress control method according to claim 1 towards energy internet, it is characterised in that: institute
Stating step (3) multiterminal corrdinated adjustment, specific step is as follows:
Step 31. alternating current-direct current power grid operation control system updates dynamic operation power data, and the data include n-th of converter station
Exchange active-power PCn, the exchange reactive power Q of n-th of converter stationCn, the total active power of the load of n-th of alternating current circuit
PTn,ac, the total reactive power Q of the load of n-th of alternating current circuitTn,acAnd the total load value P of the DC load in direct current netdc；
Step 32. ignores inverter running wastage using balanced each alternating current circuit load factor λ as cooperative scheduling target, it may be assumed that
STn,ratedThe rated capacity for indicating n-th of alternating current circuit transformer further calculates the function that n-th of converter station needs to adjust
Rate reference value PCn,ref, PCn,refIndicate the value and power reference that n-th of converter station needs to adjust:
If PCn,ref< 0, n ≠ i, n ≠ j, PCn,refIt is modified toIndicate the power reference that n-th of converter station needs to adjust
The correction value of value:
If PCn,ref>=0, n ≠ i, n ≠ j, PCn,refIt is modified to
SCn,ratedFor the rated capacity of n converter station, ηCnIndicate the safe operation load of n-th of converter station；
If step 33. judgesThe then new power command value P of each converter stationCn,newref,
PCn,newrefFor the new power command value of n-th of converter station, γ in proportion1, γ1For intermediate variable 1, it is adjusted as follows:
PTi,acIndicate the total active power of the load of i-th alternating current circuit, PCj,+Indicate the permission positive of j-th of converter station, such as
FruitThe then new power command value P of each converter stationCn,newrefγ in proportion2, γ2Become for centre
Amount 2, is adjusted:
PCj,-Indicate the permission negative power of j-th of converter station, otherwise the new power command value P of each converter stationCn,newrefMeet:
Step 34. alternating current-direct current power grid operation control system assigns each PCn,newref, other than n ≠ i, n ≠ j to i-th, j converter station
Corresponding all converter stations, realize multiterminal corrdinated adjustment.
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| CN111162556B (en) * | 2020-01-09 | 2021-09-03 | 中国科学院电工研究所 | Distributed autonomous control decision method for AC/DC power distribution and utilization system |
| CN112260329A (en) * | 2020-11-06 | 2021-01-22 | 广东电网有限责任公司佛山供电局 | Power distribution network coordination control system based on three-port soft switch |
| CN113346563B (en) * | 2021-06-18 | 2022-04-12 | 中国科学院电工研究所 | Wind-solar hydrogen storage alternating-current and direct-current hybrid power distribution energy route control method |
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