CN105790294B - A kind of alternating current-direct current mixing distribution network load uninterruptedly turns safely supplier's method - Google Patents
A kind of alternating current-direct current mixing distribution network load uninterruptedly turns safely supplier's method Download PDFInfo
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Abstract
A kind of alternating current-direct current mixing distribution network load uninterruptedly turns safely supplier's method, by scanning the effective station set of current conversion station control model, structure, priority valve, the load of calculating current conversion station uninterruptedly turn safely to be provided with and alternating current-direct current mixes distribution power flow optimization, realizes that the continual safety of alternating current-direct current mixing distribution network load turns confession.
Description
Technical field
The present invention relates to a kind of load uninterruptedly to turn safely supplier's method, between more particularly to alternating current-direct current mixes distribution network load not
Disconnected safety turns supplier's method.
Background technology
DC techniques are that solve one of existing power distribution network effective means of problems, and alternating current-direct current mixes more suitable with electricity consumption
Close future development.The distribution system of alternating current-direct current mixing not only can preferably receive highdensity distributed energy and direct current to bear
Lotus, and it is limited with the high contradiction of load density to alleviate urban distribution network website corridor, while provide dynamic nothing in load center
Work(is supported, is improved system safety and stability level and is reduced loss.As can be seen here, alternating current-direct current mixing is following weight with electricity consumption
Want development trend.
In alternating current-direct current mixing power distribution network, direct current net can realize mutual support with AC network, and AC especially occurs
During failure, the uninterrupted load transfer of multiterminal can provide strong support for the safe operation of alternating current-direct current mixing power distribution network.Using negative
The uninterrupted safe transfer control technology of lotus, and then solve the problems, such as the short term outage in traditional transfer process, corresponding turn into is handed over
One of direct current mixing distribution network operation and the critical function of scheduling.
At present, existing patent and non-patent literature uninterruptedly turn safely to supply to alternating current-direct current mixing distribution network load both at home and abroad
Technique study is less, what the author such as Zhao Biao delivered in Proceedings of the CSEE《The energy based on pressure DC distribution in flexibility is mutual
Networked system》(the 19th phase of volume 35 in 2015) text points out that AC distribution bus breaks down, in order to ensure in AC network
Important load do not power off, both ends alternating current-direct current energy internet can be operated on the premise of power is more than needed and determine alternating voltage
Control model, supported in short-term to be provided to AC network, but not yet provide concrete implementation method.Therefore, it is necessary to further
Build load in rational alternating current-direct current mixing power distribution network and uninterruptedly turn supplier's method safely.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming prior art, proposes that a kind of alternating current-direct current mixing distribution network load is uninterruptedly pacified
Turn supplier's method entirely, there is provided the uninterrupted voltage/frequency of AC system load is supported, realizes and system is exchanged under the abnormalities such as failure
The uninterrupted safety of system load turns to supply.
Meanwhile when certain current conversion station AC breaks down, the present invention can switch the same of the current conversion station control model
When quickly adjust the control models of other current conversion stations, to ensure the voltage constant of direct current net, while solved using real-time ethernet
Uninterrupted safety turns the problem of multiple current conversion station control mode switchs coordinate with protection device in supplying.The present invention uses corresponding real
When ethernet standard include but be not limited only to Ethernet/IP, Profinet, P-Net, InterBus, Vnet/IP, TCnet,
EtherCAT, PowerLink, EPA, Modbus-RTPS etc..
AC system, direct current net and current conversion station are included using the alternating current-direct current mixing power distribution network of the present invention.The described change of current
Stand i.e. AC/DC two way convertors.AC system accesses direct current net by current conversion station, and multiple AC systems are interconnected by direct current net.
Wherein：
Described direct current net includes direct-current-output type distributed energy, exchange output type distributed energy, AC load, straight
Stream load, DC/AC converters, DC/DC converters, dc circuit breaker, and DC line, wherein, the DC line access
The DC side of current conversion station, multiple dc circuit breakers are connected with DC line；Dc circuit breaker passes through DC/AC converter incoming transports
Output type distributed energy or AC load；Dc circuit breaker accesses direct-current-output type distribution energy by DC/DC converters
Source or DC load.
Described AC system includes alternating current circuit, grid-connected switch, AC circuit breaker, AC load and ac bus.Its
In, AC load incoming transport bus, ac bus passes through alternating current interruption by alternating current circuit corresponding to grid-connected switch access
Device accesses the AC of current conversion station.
The controller of described current conversion station is change of current station control, change of current station control by communication interface access in real time with
Too net.The protection controller of the grid-connected switch is grid-connected switch protection controller, and grid-connected switch protection controller passes through communication
Interface accesses real-time ethernet.The communication interface access real-time ethernet of alternating current-direct current mixing power distribution network scheduling system.Current conversion station control
Device, grid-connected switch protection controller and alternating current-direct current mixing power distribution network scheduling system three processed are led to by real-time ethernet
Letter.Wherein, change of current station control is mainly responsible for the control model of adjustment current conversion station, such as DC voltage control, active/idle work(
Operation parameters under rate control, AC constant voltage constant frequency or exchange droop control isotype, and regulation corresponding modes.Current conversion station
Obtain static information-rated capacity S of current conversion stationC,rated, current conversion station DC voltage is sampled, and sample the AC of current conversion station
Voltage, current signal, calculate the AC active-power P for obtaining the current conversion stationC, reactive power QC, and control flag bit FC,
And above-mentioned data are transmitted with other exception handling informations to alternating current-direct current mixing power distribution network scheduling system.Meanwhile by real time with
Too net receives the current conversion station priority valve Pr that alternating current-direct current mixing power distribution network scheduling system is assignedC, operation power instruction with adjustment
Information, and grid-connected switch point/conjunction state of grid-connected switch protection controller transmission.
Grid-connected switch protection controller sample grid-connected switch point/conjunction state and issued to real-time ethernet, and receive friendship
The control instruction that direct current mixing power distribution network scheduling system is assigned, the corresponding grid-connected switch separating brake/switching signal of output.Handing over simultaneously
Grid-connected switch separating brake/switching signal is exported in the case of Flow Line voltage, current anomaly.
Alternating current-direct current of the present invention mixing distribution network load uninterruptedly turns safely supplier's method, by scan current conversion station control model,
Structure effectively station is gathered, priority valve, the load of calculating current conversion station uninterruptedly turn safely to be provided with and alternating current-direct current mixing power distribution network tide
The step such as flow-optimized, realize that the continual safety of alternating current-direct current mixing distribution network load turns to supply.
The present invention comprises the following steps that：
Step 1, current conversion station control model is scanned
The scheduling system of alternating current-direct current mixing power distribution network scans the control flag bit of whole current conversion stations, represents that the 1st is changed with C1
Stream station, C2 represent the 2nd current conversion station, and by that analogy, Cn represents n-th of current conversion station, and n is current conversion station total number, and current conversion station is total
Depending on mesh n span foundation real system, but not less than 2.When j-th of current conversion station uses AC constant voltage constant frequency or exchange
During droop control pattern, then j-th of change of current stand control flag bit FCjIt is set to 1, i.e. FCj=1.
Step 2, structure effectively station set
, will wherein change of current stand control flag bit F on the basis of step 1CjCurrent conversion station not equal to 1 forms effectively station collection
Close, and obtain each self-corresponding static information, described static information includes the rated capacity S of corresponding current conversion stationC1,rated、
SC2,rated…SCm,rated, and dynamic operation power data, described dynamic operation power data includes the friendship of corresponding current conversion station
Flow side active-power PC1、PC2…PCm, and the AC reactive power Q of corresponding current conversion stationC1、QC2…QCm；M is effectively station sum
Mesh, span are not more than current conversion station total number n according to the total number m that depending on real system state, effectively stands.
Step 3, the priority valve of current conversion station is calculated
On the basis of step 2, the weighted euclidean distance value d of each current conversion station in effectively station set is calculatedC1、dC2…dCm, and
Size order according to weighted euclidean distance value carries out priority valve assignment to each current conversion station in effectively station set, weighting it is European away from
The current conversion station i priority valve Pr maximum from valueCi1 is assigned to, the current conversion station k priority valves Pr of weighted euclidean distance value sequence secondCk
2 are assigned to, the like.The scheduling system of alternating current-direct current mixing power distribution network transmits the priority valve of each current conversion station in effective station set
To each current conversion station.
Effectively the weighted euclidean distance value calculating method of each current conversion station is as follows in the set of station：
The first step, calculate in effectively station set, the rated capacity S of current conversion stationC1,rated...SCj,rated,...SCm,ratedIn
Rated capacity maximum Smax；
Second step, calculate the rated capacity S of current conversion station in effectively station setC1,rated...SCj,rated,...SCm,ratedIt is corresponding
Rated capacity normalized value SC1...SCj,...SCm：
3rd step, calculate each active volume normalized value S effectively corresponding to station in effectively station setC1,avaible...SCj, avaible...SCm,avaible：
4th step, calculate each available horsepower normalized value P effectively corresponding to station in effectively station setC1, avaible...PCj,avaible...PCm,avaible：
5th step, calculate rated capacity normalized value SC1...SCj,...SCmIn minimum valueAnd standard deviationMeter
Calculate active volume normalized value SC1,avaible...SCj,avaible...SCm,avaibleIn minimum valueAnd standard deviation
Calculate available horsepower normalized value PC1,avaible...PCj,avaible...PCm,avaibleIn minimum valueAnd standard deviation
6th step, calculate the weighted euclidean distance value d of j-th of current conversion station in effectively station setCj：
Step 4, load uninterruptedly turns safely to supply
Change of current station control detects AC voltage, DC voltage, grid-connected on off state of corresponding current conversion station etc. in real time
Information, change of current station control turn, for operation control, to realize that load uninterruptedly turns safely to supply jointly using safety.
By taking j-th of current conversion station as an example, change of current station control realize each current conversion station of alternating current-direct current mixing power distribution network between load not
Interruption safety turns as follows for progress control method：
The first step, change of current station control start Interruption, are handled into judgement；
Second step, detection change of current stand control flag bit FCj, as change of current stand control flag bit FCjEnter the 3rd step during equal to 1,
Otherwise it is transferred to the 4th step；
3rd step, grid-connected on off state is detected, if grid-connected switch is in closure state, control current conversion station has switched to
Work(/ Reactive Power Control pattern, and change of current stand control flag bit F is setCjEqual to 0, terminate this interruption；If at grid-connected switch
In off-state, control current conversion station still using AC constant voltage constant frequency or exchange droop control pattern, terminates this interruption；
4th step, judges whether change of current station control receives the instruction of priority valve reduction 1 of current conversion station, if received,
Current conversion station j priority valve Pr is then setCjReduction 1, the attonity if not receiving, and it is transferred to the 5th step；
5th step, whether the AC voltage of current conversion station is detected less than the limit value set, if the limit not less than setting
Definite value, then it is transferred to the 6th step；The 7th step is transferred to if the limit value less than setting；
6th step, detection DC voltage whether in range of normal value, if DC voltage in range of normal value,
Terminate this interruption；If DC voltage surmounts range of normal value, current conversion station j priority valve Pr is judgedCj, work as the change of current
Stand j priority valve PrCjDuring equal to 1, current conversion station j is controlled to use DC voltage control pattern, when current conversion station j priority
Value PrCjWhen not being 1, current conversion station j is controlled to be delayed its priority valve PrCjAfter times millisecond time, using DC voltage control mould
Formula, and terminate this interruption；
7th step, detects whether grid-connected switch disconnects, if grid-connected switch does not disconnect, sends grid-connected switch protection control
Device abnormal signal, and terminate this interruption；If grid-connected switch off, the 8th step is transferred to；
8th step, judge current conversion station j priority valves PrCj, as current conversion station j priority valves PrCjDuring equal to 1, through real-time ether
Net dispatches system broadcast information to each current conversion station and alternating current-direct current mixing power distribution network, and all current conversion station priority valves reduce 1, are transferred to
9th step；As current conversion station j priority valves PrCjWhen not being 1, the 9th step is directly transferred to；
9th step, control current conversion station set change of current stand control using AC constant voltage constant frequency or exchange droop control pattern
Flag bit FCjEqual to 1, terminate this interruption.
Accordingly, grid-connected switch protection controller is responsible for producing that control is grid-connected to switch off/separating brake/combined floodgate of closed procedure
Signal, fortune of the circuit under the abnormal conditions such as overcurrent, overvoltage, under-voltage, short trouble residing for grid-connected switch can be completed
Row protection.Separating brake/switching signal caused by grid-connected switch protection controller input to the motor-operating mechanism of grid-connected switch or
Coil control circuit, corresponding actions are performed by grid-connected switch.Its workflow is as follows：
The first step, grid-connected switch protection controller start Interruption, are handled into judgement；
Second step, when grid-connected switch protection controller detects fault in ac transmission system and receives alternating current-direct current mixing distribution
During the open command that net scheduling system is assigned, grid-connected switch protection controller produces grid-connected switch sub-gate signal, and is transferred to the 3rd
Step；When grid-connected switch protection controller receives the close command that alternating current-direct current mixing power distribution network scheduling system is assigned, judge simultaneously
Whether net switch both sides voltage magnitude meets grid-connected requirement with phase, such as meets grid-connected requirement, produces grid-connected switch switching signal
And the 3rd step is transferred to, grid-connected requirement is such as unsatisfactory for, then is directly transferred to the 3rd step；The 3rd step is directly transferred in the case of remaining；
3rd step, abnormality processing operation is carried out when receiving exception handling information, and terminate this interruption；When not receiving
To directly terminating this interruption during exception handling information.
Step 5, alternating current-direct current mixing distribution power flow optimization
Alternating current-direct current mixing power distribution network dispatches system according to current optimization operational objective, as economy is optimal, loss minimization
Deng, with reference to it is each station and system operation constraint, such as line transmission power constraint, current conversion station power constraint, carry out alternating current-direct current mix
Close power distribution network Optimal Power Flow to calculate, produce FCj！Control model and operation power instruction after=1 each current conversion station optimization, and under
It is sent to each current conversion station.
The present invention by flexible direct current technology be applied to AC distribution net in, impart the higher controllability of existing power distribution network with
Flexibility.Alternating current-direct current mixing power distribution network turns, for control, can effectively be lifted to the uninterrupted of AC load under Fault Isolation state
The quality of power supply of distribution system, reliability and security.Thus, the present invention for alternating current-direct current mixing distribution network load not between
Disconnected safety, which turns supply and demand, to be asked to have filled up and is mixed distribution network load with coordinating the alternating current-direct current that control coordinates based on priority valve and uninterruptedly pacified
The full blank for turning supplier's method, has wide development and application prospect.
Brief description of the drawings
The alternating current-direct current mixing power distribution network typical structure block diagram of Fig. 1 application present invention；
Fig. 2 current conversion station course of work schematic diagrames；
Fig. 3 uninterruptedly turns safely to supply method flow；
Fig. 4 effectively stand set in each current conversion station weighted euclidean distance value calculate；
Fig. 5 current conversion stations run control flow chart；
The grid-connected switch protection controller workflow diagrams of Fig. 6.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the alternating current-direct current mixing power distribution network typical structure of the application present invention.The alternating current-direct current mixing power distribution network includes exchange
System, direct current net and current conversion station.Described current conversion station is AC/DC two way convertors.AC system is accessed straight by current conversion station
Drift net, multiple AC systems are interconnected by direct current net.Wherein：
Described direct current net includes direct-current-output type distributed energy, exchange output type distributed energy, AC load, straight
Stream load, DC/AC converters, DC/DC converters, dc circuit breaker, and DC line, wherein, the DC line access
The DC side of current conversion station, multiple dc circuit breakers are connected with DC line；Dc circuit breaker passes through DC/AC converter incoming transports
Output type distributed energy or AC load；Dc circuit breaker accesses direct-current-output type distribution energy by DC/DC converters
Source or DC load.
Described AC system includes alternating current circuit, grid-connected switch, AC circuit breaker, AC load and ac bus.Its
In, AC load incoming transport bus, ac bus passes through alternating current interruption by alternating current circuit corresponding to grid-connected switch access
Device accesses the AC of current conversion station.
Fig. 2 is described current conversion station course of work schematic diagram.Change of current station control accesses real-time ether by communication interface
Net.Grid-connected switch protection controller accesses real-time ethernet by communication interface.Alternating current-direct current mixing power distribution network scheduling system is led to
Believe interface access real-time ethernet.Change of current station control, grid-connected switch protection controller and the scheduling of alternating current-direct current mixing power distribution network
System three is communicated by real-time ethernet.Wherein, change of current station control is mainly responsible for the control model of adjustment current conversion station,
Such as DC voltage control, active/Reactive Power Control, AC constant voltage constant frequency or exchange droop control isotype, and tune
Save the operation parameters under corresponding modes.Current conversion station obtains static information-rated capacity S of current conversion stationC,rated, sample the change of current and stand erectly
Side voltage is flowed, and samples AC voltage, the current signal of current conversion station, calculates the AC active power for obtaining the current conversion station
PC, reactive power QC, and control flag bit FC, and by above-mentioned data and other exception handling informations to alternating current-direct current mixing distribution
Net scheduling system is transmitted.Meanwhile current conversion station assigned by real-time ethernet reception alternating current-direct current mixing power distribution network scheduling system
Priority valve PrC, operation power instruction and adjustment information, and the grid-connected switch point/close of grid-connected switch protection controller transmission
State.
Grid-connected switch protection controller sample grid-connected switch point/conjunction state and issued to real-time ethernet, and receive friendship
The control instruction that direct current mixing power distribution network scheduling system is assigned, the corresponding grid-connected switch separating brake/switching signal of output.Handing over simultaneously
Grid-connected switch separating brake/switching signal is exported in the case of Flow Line voltage, current anomaly.
As shown in figure 3, uninterrupted safety turns to supply method flow between each current conversion station of alternating current-direct current mixing power distribution network of the present invention
It is as follows：
Step 1, current conversion station control model is scanned
The scheduling system of alternating current-direct current mixing power distribution network scans whole change of current stand control flag bits, and the 1st change of current is represented with C1
Stand, C2 represents the 2nd current conversion station, by that analogy, Cn represents n-th of current conversion station, and n is current conversion station total number, current conversion station total number n
Span according to depending on real system, but not less than 2.When j-th of current conversion station is using under AC constant voltage constant frequency or exchange
During control model of hanging down, then j-th of change of current stand control flag bit FCjIt is set to 1, i.e. FCj=1.
Step 2, structure effectively station set
, will wherein change of current stand control flag bit F on the basis of step 1CjCurrent conversion station not equal to 1 forms effectively station collection
Close, and obtain each self-corresponding static information, include the rated capacity S of corresponding current conversion stationC1,rated、SC2,rated…SCm,rated；With
And dynamic operation power data, include the AC active-power P for corresponding to current conversion stationC1、PC2…PCm, and corresponding current conversion station
AC reactive power QC1、QC2…QCm；M is that effectively station total number, span are effectively stood according to depending on real system state
Total number m is not more than current conversion station total number n.
Step 3, the priority valve of current conversion station is calculated
On the basis of step 2, the weighted euclidean distance value d of each current conversion station in effectively station set is calculatedC1、dC2…dCm, and
Priority valve assignment is carried out to each current conversion station in effectively station set according to numerical values recited order, weighted euclidean distance value is maximum to change
Stream station i priority valves PrCi1 is assigned to, the current conversion station k priority valves Pr of weighted euclidean distance value sequence secondCk2 are assigned to, successively class
Push away.The scheduling system of alternating current-direct current mixing power distribution network transmits the priority valve of each current conversion station in effective station set to each current conversion station.
Step 4, load uninterruptedly turns safely to supply
Change of current station control detects AC voltage, DC voltage, grid-connected on off state of corresponding current conversion station etc. in real time
Information, change of current station control turn, for operation control, to realize that load uninterruptedly turns safely to supply jointly using safety.
Step 5, alternating current-direct current mixing distribution power flow optimization
Alternating current-direct current mixing power distribution network dispatches system according to current optimization operational objective, as economy is optimal, loss minimization
Deng, with reference to it is each station and system operation constraint, such as line transmission power constraint, current conversion station power constraint, carry out alternating current-direct current mix
Close power distribution network Optimal Power Flow to calculate, produce FCj！Control model and operation power instruction after=1 each current conversion station optimization, and under
It is sent to each current conversion station.
As shown in figure 4, the weighted euclidean distance value calculating method of each current conversion station is as follows in the present invention effectively station set,
The first step, calculate the rated capacity S of current conversion station in effectively station setC1,rated...SCj,rated,...SCm,ratedIn
Rated capacity maximum Smax；
Second step, calculate the rated capacity S of current conversion station in effectively station setC1,rated...SCj,rated,...SCm,ratedIt is corresponding
Rated capacity normalized value SC1...SCj,...SCm：
3rd step, calculate each active volume normalized value S effectively corresponding to station in effectively station setC1, avaible...SCj,avaible...SCm,avaible：
4th step, calculate each available horsepower normalized value P effectively corresponding to station in effectively station setC1, avaible...PCj,avaible...PCm,avaible：
5th step, calculate rated capacity normalized value SC1...SCj,...SCmIn minimum valueAnd standard deviationCalculate
Active volume normalized value SC1,avaible...SCj,avaible...SCm,avaibleIn minimum valueAnd standard deviationMeter
Calculate available horsepower normalized value PC1,avaible...PCj,avaible...PCm,avaibleIn minimum valueAnd standard deviation
6th step, calculate the weighted euclidean distance value d of j-th of current conversion station in effectively station setCj：
Fig. 5 show the current conversion station operation control flow of the present invention, and by taking j-th of current conversion station as an example, change of current station control is real
Load uninterruptedly turns safely as follows for progress control method between existing each current conversion station of alternating current-direct current mixing power distribution network：
The first step, change of current station control start Interruption, are handled into judgement；
Second step, detection change of current stand control flag bit FCj, as change of current stand control flag bit FCjEnter the 3rd step during equal to 1,
Otherwise it is transferred to the 4th step；
3rd step, grid-connected on off state is detected, if grid-connected switch is in closure state, control current conversion station has switched to
Work(/ Reactive Power Control pattern, and change of current stand control flag bit F is setCjEqual to 0, terminate this interruption；If at grid-connected switch
In off-state, control current conversion station still using AC constant voltage constant frequency or exchange droop control pattern, terminates this interruption；
4th step, judges whether change of current station control receives the instruction of priority valve reduction 1 of current conversion station, if received,
Current conversion station j priority valve Pr is then setCjReduction 1, the attonity if not receiving, and it is transferred to the 5th step；
5th step, whether the AC voltage of current conversion station is detected less than the limit value set, if the limit not less than setting
Definite value, then it is transferred to the 6th step；The 7th step is transferred to if the limit value less than setting；
6th step, detection DC voltage whether in range of normal value, if DC voltage in range of normal value,
Terminate this interruption；If DC voltage surmounts range of normal value, the priority valve Pr of the disconnected current conversion station j is sentencedCj, work as the change of current
Stand j priority valve PrCjDuring equal to 1, current conversion station j is controlled to use DC voltage control pattern, when current conversion station j priority
Value PrCjWhen not being 1, current conversion station j is controlled to be delayed its priority valve PrCjAfter times millisecond time, using DC voltage control mould
Formula, and terminate this interruption；
7th step, detects whether grid-connected switch disconnects, if grid-connected switch does not disconnect, sends grid-connected switch protection control
Device abnormal signal, and terminate this interruption；If grid-connected switch off, the 8th step is transferred to；
8th step, judge current conversion station j priority valves PrCj, as current conversion station j priority valves PrCjDuring equal to 1, through real-time ether
Net dispatches system broadcast information to each current conversion station and alternating current-direct current mixing power distribution network, and all current conversion station priority valves reduce 1, are transferred to
9th step；As current conversion station j priority valves PrCjWhen not being 1, the 9th step is directly transferred to；
9th step, control current conversion station set change of current stand control using AC constant voltage constant frequency or exchange droop control pattern
Flag bit FCjEqual to 1, terminate this interruption.
Fig. 6 is the grid-connected switch protection controller workflow of the present invention：
The first step, grid-connected switch protection controller start Interruption, are handled into judgement；
Second step, when grid-connected switch protection controller detects fault in ac transmission system and receives alternating current-direct current mixing distribution
During the open command that net scheduling system is assigned, grid-connected switch protection controller produces grid-connected switch sub-gate signal, and is transferred to the 3rd
Step；When grid-connected switch protection controller receives the close command that alternating current-direct current mixing power distribution network scheduling system is assigned, judge simultaneously
Whether net switch both sides voltage magnitude meets grid-connected requirement with phase, such as meets grid-connected requirement, produces grid-connected switch switching signal
And the 3rd step is transferred to, grid-connected requirement is such as unsatisfactory for, then is directly transferred to the 3rd step；The 3rd step is directly transferred in the case of remaining；
3rd step, abnormality processing operation is carried out when receiving exception handling information, and terminate this interruption；When not receiving
To directly terminating this interruption during exception handling information.
Claims (3)
1. a kind of alternating current-direct current mixing distribution network load uninterruptedly turns safely supplier's method, it is characterised in that：Described safety turns supplier
Priority valve, the load that method gathers, calculated current conversion station by scanning current conversion station control model, structure effectively station uninterruptedly turn safely
It is provided with and alternating current-direct current mixing distribution power flow optimizes, realizes that the continual safety of alternating current-direct current mixing distribution network load turns to supply；
Described safety turns as follows for method and step：
Step 1, current conversion station control model is scanned
The scheduling system of alternating current-direct current mixing power distribution network scans the control flag bit of whole current conversion stations, with C1 represent the 1st current conversion station,
C2 represents the 2nd current conversion station, and by that analogy, Cn represents n-th of current conversion station, and n is current conversion station total number, and n is not less than 2；When j-th
When current conversion station is using AC constant voltage constant frequency or exchange droop control pattern, then the control flag bit F of j-th of current conversion stationCjIt is set to
1, i.e. FCj=1；
Step 2, structure effectively station set
, will wherein change of current stand control flag bit F on the basis of step 1CjCurrent conversion station not equal to 1 forms effectively station set, and
Each self-corresponding static information is obtained, the static information includes the rated capacity S of corresponding current conversion stationC1,rated、SC2,rated…
SCm,rated, and dynamic operation power data, the dynamic operation power data includes the AC wattful power of corresponding current conversion station
Rate PC1、PC2…PCm, and the AC reactive power Q of corresponding current conversion stationC1、QC2…QCm；M is not more than for effectively station total number, m
Current conversion station total number n；
Step 3, the priority valve of current conversion station is calculated
On the basis of step 2, the weighted euclidean distance value d of each current conversion station in effectively station set is calculatedC1、dC2…dCm, and according to
The size order of weighted euclidean distance value carries out priority valve assignment, weighted euclidean distance value to each current conversion station in effectively station set
Maximum current conversion station i priority valves PrCi1 is assigned to, the current conversion station k priority valves Pr of weighted euclidean distance value sequence secondCkIt is assigned to
2, the like；The scheduling system of alternating current-direct current mixing power distribution network transmits the priority valve of each current conversion station in effective station set to each
Current conversion station；
Step 4, load uninterruptedly turns safely to supply
Change of current station control detects the information such as the AC voltage, DC voltage, grid-connected on off state of corresponding current conversion station in real time,
Change of current station control turns, for operation control, to realize that load uninterruptedly turns safely to supply jointly using safety；
Step 5, alternating current-direct current mixing distribution power flow optimization
The scheduling system of alternating current-direct current mixing power distribution network carries out the optimization of alternating current-direct current mixing power distribution network according to current optimization operational objective
Load flow calculation, produce FCj！Control model and operation power instruction after=1 each current conversion station optimization, and it is issued to each current conversion station.
2. uninterruptedly turn supplier's method safely according to the alternating current-direct current mixing distribution network load described in claim 1, it is characterised in that：Institute
In the step 3 stated, effectively the weighted euclidean distance value calculating method of each current conversion station is as follows in the set of station：
The first step, calculate in effectively station set, the rated capacity S of current conversion stationC1,rated...SCj,rated,...SCm,ratedIn volume
Constant volume maximum Smax；
Second step, calculate in effectively station set, the rated capacity S of current conversion stationC1,rated...SCj,rated,...SCm,ratedIt is specified
Capacity normalized value SC1...SCj,...SCm：
3rd step, calculate each active volume normalized value S effectively corresponding to station in effectively station setC1, avaible...SCj,avaible...SCm,avaible：
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4th step, calculate each available horsepower normalized value P effectively corresponding to station in effectively station setC1,avaible...PCj, avaible...PCm,avaible：
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5th step, calculate rated capacity normalized value SC1...SCj,...SCmIn minimum valueAnd standard deviationCalculate available
Capacity normalized value SC1,avaible...SCj,avaible...SCm,avaibleIn minimum valueAnd standard deviationCalculating can
With power normalized value PC1,avaible...PCj,avaible...PCm,avaibleIn minimum valueAnd standard deviation
6th step, calculate the weighted euclidean distance value d of j-th of current conversion station in effectively station setCj：
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3. uninterruptedly turn supplier's method safely according to the alternating current-direct current mixing distribution network load described in claim 1, it is characterised in that：Institute
In the step 4 stated, the safety of change of current station control turns as follows for progress control method：
The first step, change of current station control start Interruption, are handled into judgement；
Second step, detection change of current stand control flag bit FCj, as change of current stand control flag bit FCjEnter the 3rd step during equal to 1, otherwise
It is transferred to the 4th step；
3rd step, detect grid-connected on off state, if grid-connected switch be in closure state, control current conversion station switch to it is active/
Reactive Power Control pattern, and change of current stand control flag bit F is setCjEqual to 0, terminate this interruption；If grid-connected switch is in
Off-state, control current conversion station still using AC constant voltage constant frequency or exchange droop control pattern, terminate this interruption；
4th step, judges whether change of current station control receives the instruction of priority valve reduction 1 of current conversion station, if received, sets
Put the priority valve Pr of the current conversion stationCjReduction 1, the attonity if not receiving, and it is transferred to the 5th step；
5th step, detect current conversion station AC voltage whether less than setting limit value, if not less than the limit value of setting,
Then it is transferred to the 6th step；The 7th step is transferred to if the limit value less than setting；
6th step, whether detection DC voltage is in range of normal value, if DC voltage in range of normal value, terminates
This is interrupted；If DC voltage surmounts range of normal value, the priority valve Pr of the current conversion station is judgedCj, when the current conversion station
Priority valve PrCjDuring equal to 1, the current conversion station is controlled to use DC voltage control pattern, when the priority valve of the current conversion station
PrCjWhen not being 1, the current conversion station is controlled to be delayed its priority valve PrCjAfter times millisecond time, using DC voltage control pattern,
And terminate this interruption；
7th step, detects whether grid-connected switch disconnects, if grid-connected switch does not disconnect, it is different to send grid-connected switch protection controller
Regular signal, and terminate this interruption；If grid-connected switch off, the 8th step is transferred to；
8th step, judge current conversion station j priority valves PrCj, as current conversion station j priority valves PrCjDuring equal to 1, through real-time ethernet to
Each current conversion station and alternating current-direct current mixing power distribution network dispatches system broadcast information, and all current conversion station priority valves reduce 1, are transferred to the 9th
Step；As current conversion station j priority valves PrCjWhen not being 1, the 9th step is directly transferred to；
9th step, control current conversion station set change of current stand control mark using AC constant voltage constant frequency or exchange droop control pattern
Position FCjEqual to 1, terminate this interruption.
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| CN108777483B (en) * | 2018-05-31 | 2019-11-22 | 国网浙江省电力有限公司电力科学研究院 | Load based on flexible multimode switch turns online for method |
| US11121543B2 (en) | 2018-12-31 | 2021-09-14 | Abb Schweiz Ag | Fault mitigation in medium voltage distribution networks |
| US10971934B2 (en) | 2018-12-31 | 2021-04-06 | Abb Schweiz Ag | Distribution networks with flexible direct current interconnection system |
| US11031773B2 (en) | 2019-03-27 | 2021-06-08 | Abb Power Grids Switzerland Ag | Transformer isolation response using direct current link |
| US10819112B1 (en) | 2019-03-27 | 2020-10-27 | Abb Schweiz Ag | Feeder line fault response using direct current interconnection system |
| CN110838721A (en) * | 2019-11-20 | 2020-02-25 | 南方电网科学研究院有限责任公司 | Power distribution network power distribution method, device, equipment and storage medium |
| CN112039110B (en) * | 2020-09-22 | 2024-05-14 | 贵州大学 | Reliability assessment method for flexible direct-current power distribution network with optical storage system |
| 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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| CN104037774A (en) * | 2013-03-06 | 2014-09-10 | 珠海优特电力科技股份有限公司 | Method and system for controlling devices in micro grid based on priority |
| CN204230892U (en) * | 2014-12-11 | 2015-03-25 | 三峡大学 | A kind of electric automobile can flexible access containing important load DC distribution net |
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| CN104037774A (en) * | 2013-03-06 | 2014-09-10 | 珠海优特电力科技股份有限公司 | Method and system for controlling devices in micro grid based on priority |
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