CN104218546B - A kind of self-healing recovery control method of intelligent distribution network - Google Patents
A kind of self-healing recovery control method of intelligent distribution network Download PDFInfo
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Abstract
The invention discloses a kind of self-healing recovery control method of intelligent distribution network, belong to field of power system control, using loss minimization as the Optimization goal of reconstruct, distribution power system load flow calculation is carried out using the forward-backward sweep method of nodal hierarchy according to the radial design feature of power distribution network.New solution is used for the closed-loop case being likely to occur in restructuring procedure, to avoid the generation of a large amount of infeasible solutions, the calculating dimension in optimization algorithm is reduced.If the master switch number opened in radial distribution networks is equal to interconnection switch number and system is without isolated island, the result that can ensure reconstruct is individual without closed network, and wherein isolated island judgement can be by Load flow calculation, without another programming.The method is simple and effective, reduces computing dimension, it is easy to program, it is adaptable to the power distribution network self-healing recovery control of real-time.
Description
Technical field
Patent of the present invention is related to a kind of self-healing recovery control method of intelligent distribution network, more particularly to a kind of intelligent distribution network
The method of reconfiguration of electric networks, belongs to technical field of electric power system control after breaking down.
Background technology
Intelligent distribution network is the important component of intelligent grid, and it is mainly characterized by with complete self-healing function, energy
Farthest reduce influence of the electric network fault to user.Power distribution network is typically closed loop design, open loop and radially runs.When
When power distribution network breaks down, by changing the state of block switch and interconnection switch, supply network is reconfigured, recover load and supply
Electricity., it is necessary to consider reduction system losses, improve quality of voltage, realize bearing during self-healing recovery is reconstructed after a failure
Lotus balance etc. many contents, therefore power distribution network reconfiguration be a multiple target, many dimensions, multiple constraint, multi-period nonlinear group
State optimization problem.Therefore globally optimal solution is not only found when power distribution network reconfiguration is carried out, and it is high to solving speed requirement.
The main method of current power distribution network reconfiguration can be divided into three kinds：Mathematics Optimization Method, heuristic search, Yi Jiren
Work intelligent method., because there is complete strict mathematical theory basis, algorithm stability is good, but there is amount of calculation for Mathematics Optimization Method
Greatly, the problem of overlong time is calculated.Heuristic search and artificial intelligence approach are to be applied to heuristic or intelligent method
It is the hot issue of Recent study in fault recovery reconstruction strategy.But heuristic search and artificial intelligence approach are received
The original state influence of system is big, and the stability of algorithm is not strong, and computational efficiency is not high.
So the reconfiguration of electric networks for how fast and effectively carrying out power distribution network after failure is the control of intelligent distribution network self-healing recovery
Key issue.
The content of the invention
It is an object of the invention to overcome drawbacks described above, there is provided a kind of optimizing has certainty, while improving calculating again
The self-healing recovery control method of the intelligent distribution network of speed so that self-healing recovery control has stability and rapidity.
In order to solve the above problems, the technical scheme that apparatus of the present invention are used for：A kind of self-healing of intelligent distribution network is extensive
Multiple control method, it is characterised in that using search reconfiguration scheme, comprise the following steps：
Step S1, initialisation switch sequence, every initial value is all 1；
Step S2, the switch number that input is broken down, the switch value of this is set to 0；
Step S3, in addition to the switch of failure, produces one group of new on off sequence；
Step S4, judges whether the master switch number opened is equal to interconnection switch number, if equal entrance S5, otherwise returns to step
Rapid S3；
Step S5, calls Load flow calculation module, returning result to take each node voltage, on off sequence, iterations, total network loss
With each branch power value；
Step S6, judges to meet whether the total node number that magnitude of voltage is 1 is equal to feeder line number and node voltage and line simultaneously
Road performance number is less than maximum permissible value, if satisfaction enters S7, otherwise returns to step S3；
Step S7, is sequentially output each node voltage value, correspondence on off sequence, iterations, total network loss；
Step S8, chooses the on off sequence of loss minimization as reconstruct optimal solution.
The self-healing recovery control method of foregoing a kind of intelligent distribution network, if the master switch opened in radial distribution networks
Number is equal to interconnection switch number and system is without isolated island, then the result for ensureing reconstruct is individual without closed network, and wherein isolated island judges to borrow
Help Load flow calculation module.
A kind of self-healing recovery control method of foregoing intelligent distribution network, using loss minimization as the Optimization goal of reconstruct,
Distribution power system load flow calculation is carried out using the forward-backward sweep method of nodal hierarchy according to the radial design feature of power distribution network.
A kind of self-healing recovery control method of foregoing intelligent distribution network, can also be reconstructed except obtaining reconstruct optimal solution
Suboptimal solution.
The self-healing recovery control method of foregoing a kind of intelligent distribution network, using loss minimization as the Optimization goal of reconstruct
Reconstruction model is：
I is node number in formula, and n is network total node number, and I is the branch current before node i, and r is branch impedance；
Constraints is in restructuring procedure：
Load flow calculation is constrained：Whenever Load flow calculation will be re-started after structure change；
Capacity of trunk is constrained：Si≤Smax；
Node voltage is constrained：Vmin≤Vi≤Vmax；
Network topology is constrained：Power distribution network or tree after reconstruct, are not allow for the generation of looped network and isolated island；
Wherein, SiAnd SmaxThe respectively maximum permissible value of the overpowering calculated value of i line flows and capacity of trunk, VminWith
VmaxIt is the lower limit and higher limit of node voltage, ViIt is the magnitude of voltage of node i.
A kind of self-healing recovery control method of foregoing intelligent distribution network, in step s 6, magnitude of voltage refers to magnitude of voltage for 1
Equal to rated voltage.
The present invention carries out eliminating the reconstruct of isolated island using Load flow calculation.In preceding pushing back for Load flow calculation, due to isolated island
Node is not connected directly or indirectly with feeder line, causes, when down back substitution calculates voltage step by step from feeder line, not traverse orphan
Island node.When isolated island node is not involved in Load flow calculation, the magnitude of voltage of isolated island node can be the initial voltage of Load flow calculation.Therefore without orphan
The necessary and sufficient condition on island is reduced to the nodes that magnitude of voltage after Load flow calculation is 1 and is necessarily equal to feeder line number.The elimination closed loop and isolated island
Method, advantage just directly by Load flow calculation just can judge whether this reconfiguration scheme forms closed loop or isolated island, be not required to separately
The subprogram called and judge closed loop and isolated island is write outward, algorithm is optimized, the arithmetic speed of reconstruct is accelerated.
Brief description of the drawings
Fig. 1 is the power distribution network reconfiguration flow chart based on optimal network loss；
Fig. 2 is search reconfiguration scheme flow chart；
Fig. 3 is IEEE16 node primitive network structure charts；
Fig. 4 is network structure after the failure reconfiguration of Line 1 road；
Symbol description KG in wherein Fig. 2 represents switch combination.
Specific embodiment
For technical scheme, technical characteristic, reached purpose and effect for making present invention realization are easy to understand, with reference to
Specific embodiments and the drawings, are expanded on further the present invention.
The present invention proposes a kind of new reconstructing method to solve the problems, such as algorithm stability and rapidity.Its main think of
Think as follows：Distribution network is structurally characterized in that radial power supply, and typically N bars feeder line is designed with N number of interconnection switch.Propose to work as and beat
The master switch number opened is equal to interconnection switch number, and system is without isolated island, then the result for ensuring that reconstruct is individual without closed loop
Effective scheme.The optimum organization search for improving the method for exhaustion is so carried out during reconfiguration scheme is searched for, closed loop, orphan is eliminated
Island and the solution of trend constraint condition is unsatisfactory for, finally chooses optimal network loss side in all feasible reconfiguration scheme after having searched for
Case.This reconstructing method belongs to the category of Mathematics Optimization Method, and optimizing has certainty, while improve calculate asking for dimension again
Topic, calculating speed is fast.
A kind of intelligent distribution network of the present invention break down after reconfiguration of electric networks method, its content is by power distribution network reconfiguration mould
Type, distribution power system load flow calculation and the part of algorithm for distribution network reconfiguration three composition.As shown in Figure 1, Figure 2, Figure 3, Figure 4, the present invention is preferable
The method of embodiment is specific as follows：
(1) power distribution network reconfiguration model
The final Optimization goal of power distribution network reconfiguration of the present invention is loss minimization.Its model is as follows：
I is node number in formula, and n is network total node number, and I is the branch current before node i, and r is branch impedance.
Constraints is in restructuring procedure：
Load flow calculation is constrained：Whenever Load flow calculation will be re-started after structure change.
Capacity of trunk is constrained：Si≤Smax。
Node voltage is constrained：Vmin≤Vi≤Vmax。
Network topology is constrained：Power distribution network or tree after reconstruct, are not allow for the generation of looped network and isolated island.
Wherein, SiAnd SmaxThe respectively maximum permissible value of the overpowering calculated value of i line flows and capacity of trunk, VminWith
VmaxIt is the lower limit and higher limit of node voltage, ViIt is the magnitude of voltage of node i.
(2) Load flow calculation of power distribution network
Compared with grid, the structure of power distribution network, the method for operation, device type and component parameters etc. are all different,
Its power flow algorithm also should be different.Power distribution network mostly has cyclic structure, but due to fault location and relay protection setting
The need for and open loop operation.Distribution network line length is short compared with power transmission network, and power distribution network circuit of the circuit section than power transmission network
Section is small.The particularly use of power cable, causes the r/x of power distribution network larger, some circuits r>Even, this is often caused often x
Rule trend does not restrain.Because power distribution network is in configuration aspects and the obvious difference of power transmission network, have very much to power transmission network Load flow calculation
The traditional algorithm of effect.Such as the inferior method of the pressgang of newton one and PQ decomposition methods not necessarily reach satisfied meter in distribution power system load flow calculation
Effect is calculated, the situation for morbid state often occur, Load flow calculation is difficult to restrain.
Forward-backward sweep method is to solve for one of optimal algorithm of radial distribution networks Power Flow Problem.The present invention is using based on node
The forward-backward sweep method of layering carries out Load flow calculation.Forward-backward sweep method is each node load of known network, it is assumed that node voltage is volume
Determine voltage, each branch power is calculated from network end-point to head end；Then since the root node according to each branch power step-by-step calculation
Voltage.The purpose of nodal hierarchy essence is exactly to look for corresponding node during generation calculating voltage x current is preceding pushed back.
(3) algorithm for distribution network reconfiguration based on optimal network loss
The present invention uses binary coding, i.e., with 0 and 1 two character come the disconnection of representation switch and open mode.To net
Each branch road finishes sequence number in network, and a string of binary codes are to represent a reconfiguration scheme.Which which position of binary code corresponds to
Number branch switch.The length of binary code is then equal to total circuitry number of distribution network.Power distribution network is typically N bars feeder line with N
Individual interconnection switch design, makes total system open loop operation, so it is to ensure to have in network after reconstruct and can only have N number of switch opening
The necessary condition of network open loop.By this point present invention improves over exhaustive search algorithm, for distribution network, only search wherein contains
The binary system sequence of N 1.Do so can not only accomplish, from global optimizing, a feasible program not being missed, and in certain journey
Program operation speed is accelerated on degree.
For distribution network of the N bars feeder line with N number of interconnection switch, the master switch number opened after reconstruct is ensured is equal to contact
On the premise of switch number N, if being occurred in that in certain feeder line, two are opened switch, not only necessarily occur isolated island section in this feeder line
Point, and due to having used two to open switch, being only left N-2 opening switch will be assigned in remaining N-1 bars feeder line
Go, i.e., a closed loop necessarily occurs.I.e. on the premise of the master switch number opened after ensureing reconstruct is equal to interconnection switch number, have
Isolated island must then have closed loop, then must be without closed loop without isolated island.Network of the N bars feeder line with N number of interconnection switch eliminates filling for closed loop and wants accordingly
The master switch number that condition is opening is equal to interconnection switch number and without isolated island.
The present invention carries out eliminating the reconstruct of isolated island using Load flow calculation.In preceding pushing back for Load flow calculation, due to isolated island
Node is not connected directly or indirectly with feeder line, causes, when down back substitution calculates voltage step by step from feeder line, not traverse orphan
Island node.When isolated island node is not involved in Load flow calculation, the magnitude of voltage of isolated island node can be the initial voltage of Load flow calculation.Therefore without orphan
The necessary and sufficient condition on island is reduced to the nodes that magnitude of voltage after Load flow calculation is 1 and is necessarily equal to feeder line number.The elimination closed loop and isolated island
Method, advantage just directly by Load flow calculation just can judge whether this reconfiguration scheme forms closed loop or isolated island, be not required to separately
The subprogram called and judge closed loop and isolated island is write outward, algorithm is optimized, the arithmetic speed of reconstruct is accelerated.
Embodiment chooses IEEE16 nodes distribution network model (shown in Fig. 3) and is reconstructed algorithm simulating test.One KG sequence
A reconfiguration scheme is represented, search reconfiguration scheme flow chart is as shown in Figure 2.
If Line 1 road is broken down, No. 1 downstream node is dead electricity region.If the method for exhaustion generates initial reconstitution scheme, meeting
Produce 216 i.e. 65536 kinds of schemes.And restructing algorithm proposed by the present invention, it is only necessary to consider that wherein 3 is 0, it is remaining to be all 1
Situation, hasKind.In fact, after failure occurs, because the switch of isolated fault point have to be off, illustrating this position
It is 0, number of combinations is further reduced toKind.The necessary and sufficient condition of isolated island is finally eliminated after cooperation Load flow calculation, i.e., is only allowed
The voltage of feeder line is initial voltage, and the reconfiguration scheme quantity for being met requirement is 13 groups.It is defeated according to the ascending arrangement of network loss
Go out preceding 4 groups of data, as shown in table 1.Optimal network loss reconfiguration scheme is understood to disconnect switch 1,5,15, network structure after failure reconfiguration
It is topological as shown in Figure 4.
The reconstruction result table of table 1
The the first prescription case for opening switch 1,5,15 as shown in Figure 4 is can successfully to recover the power supply in dead electricity area, is also
The reconfiguration scheme of optimal network loss.This algorithm can also obtain remaining scheme in addition, that is, the suboptimal solution for reconstructing.
General principle of the invention, principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (3)
1. the self-healing recovery control method of a kind of intelligent distribution network, it is characterised in that using search reconfiguration scheme, including following step
Suddenly：
Step S1, initialisation switch sequence, every initial value is all 1；
Step S2, the switch number that input is broken down, the switch value of this is set to 0；
Step S3, in addition to the switch of failure, produces one group of new on off sequence；
Step S4, judges whether the master switch number opened is equal to interconnection switch number, if equal entrance S5, otherwise returns to step
S3；
Step S5, calls Load flow calculation module, and returning result takes each node voltage, on off sequence, iterations, total network loss and each
Branch power value；Using loss minimization as the Optimization goal of reconstruct, according to the radial design feature of power distribution network using node point
The forward-backward sweep method of layer carries out distribution power system load flow calculation；
Step S6, judges to meet whether the total node number that magnitude of voltage is 1 is equal to feeder line number and node voltage and circuit work(simultaneously
Rate value is less than maximum permissible value, if satisfaction enters S7, otherwise returns to step S3；Magnitude of voltage for 1 refer to magnitude of voltage be equal to it is specified
Voltage；
Step S7, is sequentially output each node voltage value, correspondence on off sequence, iterations, total network loss；
Step S8, chooses the on off sequence of loss minimization as reconstruct optimal solution.
2. the self-healing recovery control method of a kind of intelligent distribution network according to claim 1, it is characterised in that radial
If the master switch number opened in power distribution network is equal to interconnection switch number and system is without isolated island, the result for ensureing reconstruct is that a nothing is closed
Loop network, wherein isolated island are judged by Load flow calculation module.
3. the self-healing recovery control method of a kind of intelligent distribution network according to claim 1, it is characterised in that except obtaining
Reconstruct optimal solution can also obtain the suboptimal solution of reconstruct.
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| CN103036234A (en) * | 2013-01-10 | 2013-04-10 | 南京软核科技有限公司 | Power distribution network anti-error optimization method |
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| CN103001216A (en) * | 2012-03-28 | 2013-03-27 | 河海大学 | Method for quickly restoring power supply of power distribution network containing distributed power source |
| CN103036234A (en) * | 2013-01-10 | 2013-04-10 | 南京软核科技有限公司 | Power distribution network anti-error optimization method |
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