CN111753385A - Power supply searching method based on water flow path simulating algorithm - Google Patents
Power supply searching method based on water flow path simulating algorithm Download PDFInfo
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- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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Abstract
A power supply searching method based on a water flow simulating path algorithm belongs to the technical field of power distribution networks in power systems, particularly relates to an intelligent distributed FA system, particularly relates to a method for automatically determining a power supply path by a contact switch when a power grid architecture changes, and particularly adopts the water flow simulating path algorithm. The method is suitable for a power distribution network powered by a plurality of power supplies and is realized based on a topological graph of the power distribution network, when the contact switches are replaced successfully in the power distribution network, the new contact switches broadcast contact switch locking messages, and all the contact switches search the power supplies connected to the two sides of the contact switches again. By adopting the technical scheme provided by the invention, when the power supply network framework changes, the interconnection switches with the changed grid structure are automatically locked through peer-to-peer communication between the power distribution terminals, and meanwhile, the power supplies connected with the two sides of each interconnection switch and the paths reaching the power supplies are re-determined through a water flow simulating path algorithm, so that a basis is provided for load judgment during power supply switching after fault isolation.
Description
Technical Field
The invention belongs to the technical field of distribution networks in power systems, and particularly relates to an intelligent distributed FA system, in particular to a method for automatically determining a power supply path by a contact switch when a power grid architecture changes, specifically to a method for adopting a water flow simulating path algorithm.
Background
With the stricter requirements of national power grids on power distribution networks, intelligent distributed FA systems based on peer-to-peer communication are applied more and more.
In the traditional intelligent distributed FA logic, the interconnection switch is always determined and unchanged, and the interconnection switch can restore the power supply of a non-fault area through closing after the fault isolation is successful.
In order to avoid affecting the use of normal power supply users, the load condition of the power supply to be transferred needs to be judged during the transfer, and whether the power supply has the transfer capability or not is judged.
If the power supply grid structure changes (namely the position of the interconnection switch changes), the power supply grid structure can be normally used only by changing the parameter configuration, but in the actual operation process, the work cannot be realized by long-time power failure overhaul. Meanwhile, when the multistage interconnection switch is in an operation mode, after the grid structure is changed, the power supply connected with the interconnection switch is possibly changed, if the power supply is judged according to the configuration before the change, the switching capacity of the power supply is possibly judged by mistake during switching, and when the switching capacity of the power supply is insufficient, the overload problem can occur when the interconnection switch is switched on and is switched on.
Disclosure of Invention
The invention aims to provide a method, when a power supply grid structure is changed, a contact switch automatically updates parameter configuration, and searches power supplies connected at two sides to provide support for switching to supply and recovery when a fault occurs.
In order to achieve the purpose, the invention adopts the technical scheme that: a power supply searching method based on a water flow simulating path algorithm is suitable for a power distribution network powered by a plurality of power supplies, and is realized based on a topological graph of the power distribution network.
Further, the interconnection switch uses a water flow simulating path algorithm to search power supplies connected to two sides of the interconnection switch again based on a topological graph of a power distribution network and the state of each switch, and the algorithm comprises the following steps:
step A, the interconnection switch traverses the topological graph to two sides,
step B, if meeting the on-position switch, continuing traversing, if meeting the off-position switch, stopping,
step C, stopping if the top end or the tail end of the topological graph is reached,
and if the two sides have paths to the power supply in the traversal result, finishing the search.
By adopting the technical scheme provided by the invention, when the power supply network framework is changed, the interconnection switch with the changed grid structure can be automatically locked only through peer-to-peer communication between power distribution terminals without passing through a power distribution master station, and meanwhile, the power supply connected with the two sides of each interconnection switch and the path reaching the power supply are re-determined through a water flow simulating path algorithm, so that a foundation is provided for load judgment during switching after fault isolation. The power supply is searched according to the topological path from the position of the interconnection switch by adopting a water flow path simulating algorithm, so that the method is quicker and is suitable for realizing an embedded system.
Drawings
Figure 1 is a schematic diagram of a power distribution network,
fig. 2 and 3 are topological diagrams of fig. 1.
In the figure, the blocks represent switches in addition to the power supply.
Detailed Description
The power distribution terminal completes communication among the terminals, sets the switch type, controls the breaking of the switch and completes the set logic function. For convenience of description, switches are used herein to represent devices in a node, and those skilled in the art will not misunderstand.
Referring to fig. 1, there are 4 power supplies in total in this embodiment, power supply 1-power supply 4.
When a fault occurs, the interconnection switch is closed, and power supply transfer in a non-fault area is realized.
The tie switches in fig. 1 are respectively:
there are three on the bus: g1-5, G2-5 and G3-5, the bus is a line for connecting power supplies, and all power supply trunks are connected with the bus.
There are two on the trunk: g2-2, G2-8, the backbone is the line connecting the bus to the customer's distribution box.
There are three on the branch line: g2, g5 and g8, wherein branch lines are lines except the bus and the main line in the power distribution network.
Assuming a fault at F, the tie switch G2 is ready to close after the switches G1-4, G1 tripped the isolation fault. g2, power supply 2 and power supply 1 are connected on two sides, and the connection paths are respectively:
G2-G1-G1-4-G1-2-power supply 2.
G2-G3-G1-7-G1-8-power supply 1.
A fault occurs on the path g2 to power supply 2, so the power supply to be diverted is power supply 1.
Before closing, G2 obtains the real-time load P2 of the power supply 1 from the switch G1-8 closest to the power supply 1, obtains the load P3 of the switch before the fault (i.e. how many loads the fault trips) from the switch G1-4 at the upstream of the fault point, and then judges according to the maximum available load P1 of the power supply 1: if (P1-P2) K > P3, the g2 can be switched on, and the power supply 1 supplies power to the non-fault area under the switch g1, otherwise, the power supply 1 is insufficient in power supply, overload fault of the power supply point 1 can be caused after switching, and switching is refused.
K is the transfer coefficient, and takes a value of 0.2-1, which takes a value of 0.8 in this embodiment.
Obviously, the determination before the transfer needs to know which power supply is transferred to the non-fault area after the contact switch is closed, and therefore, the determination needs to know the power supplies connected to the two sides of the contact switch.
When the power supply grid structure changes, namely the position of a certain interconnection switch changes, the connection relation between the interconnection switch at certain positions and a power supply is influenced.
Generally speaking, the paths from both sides of the interconnection switch on the bus and the trunk to the power supply do not change, and what changes is the interconnection switch on the branch.
Taking interconnection switch g5 as an example, in the case of the above-mentioned interconnection switch configuration, the power supplies connected to both sides of g8 are power supply 3 and power supply 4, respectively, and the paths are:
G5-G6-G2-7-G2-9-G3-8-G3-9-power supply 3.
G5-G4-G2-4-G2-3-G3-2-G3-3-power supply 4.
If the power grid architecture changes as follows: g2-2 is not used as a tie switch, G3-2 is used as a tie switch, then the power supplies connected with the two sides of G8 are respectively a power supply 3 and a power supply 2, and the paths are respectively as follows:
G5-G6-G2-7-G2-9-G3-8-G3-9-power supply 3.
G5-G4-G2-4-G2-2-G1-3-G1-2-power supply 2.
Obviously, if the connection relation between the g5 and the power supply is not updated according to the change of the power supply grid structure, when g5 is required to switch on and switch over power supply when a fault occurs, misjudgment can occur on the load of the power supply to be switched over.
In this embodiment, the switches communicate with each other; each switch sends out a heartbeat message every t1, and if the heartbeat message of the adjacent switch is not received within 2 x t1 time, the adjacent switch is considered to be disconnected.
Each switch judges the on-off state of the switch, and sends out messages to the outside at the same time, and the message content is attached with the switch position message. The message may be sent in a heartbeat message.
When the contact switches are replaced successfully in the power distribution network, the new contact switches broadcast contact switch locking messages, and after all the contact switches receive the locking messages, the power supplies connected to the two sides of the contact switches are searched again.
After the contact switch is replaced, after the contact switch is normally operated for a period of time, the contact switch can be considered to be successfully replaced.
In order to broadcast the notification of the successful replacement of the interconnection switch in time, the following method is adopted in the embodiment for judgment:
after the interconnection switch is replaced, the interconnection switch judges the circuit from two sides of the interconnection switch to the power supply, and if the circuit is not provided with a switch or is provided with a switch and is in a closed state, the interconnection switch is successfully replaced.
According to the heartbeat messages of the switches, the judgment mode can be optimized: after the interconnection switch is replaced, the interconnection switch judges the lines from two sides of the interconnection switch to the power supply, and if the lines are not provided with switches or provided with switches and are in a closed state and are maintained for 2 × t1 time, the replacement is successful. the value of t1 ranges from 5 seconds to 25 seconds, and in this embodiment, t1 takes 20 seconds.
Referring to FIG. 1, if G2-2 is not used as the tie switch, G3-2 is used as the tie switch, and G3-2 needs to be opened and G2-2 needs to be closed.
G3-2 first looks for a line with both sides connected to the power supply. And then whether the replacement is successful is judged.
The lines from both sides of G3-2 to the power supply are:
G3-2-G2-3-G2-2-G1-3-G1-2-power supply 2.
G3-2-G3-3-power supply 4.
Normally, only switches G2-2 and G3-2 will be active, while the other switches will not be active.
Before G2-2 is not closed, the "no switch on line or switch and closed" is not complied with, the replacement is not completed.
When G2-2 is closed, a switch is arranged on a line from G3-2 to the power supplies on two sides and is in a closed state, so that the condition of successful replacement is met. To ensure that the line is normal, G3-2 broadcasts a tie switch lock message after the above state is maintained at 2 × t 1.
Since the connection relationship between the interconnection switch and the power source at some positions is affected when the power supply grid structure is changed, the switching function needs to be locked before the connection relationship is confirmed again.
In the embodiment, before the contact switch in the power distribution network is successfully replaced, the new contact switch broadcasts the contact switch replacement message, and other contact switches are locked to transfer the power supply function after receiving the message; and after the interconnection switch finishes searching the power supplies connected with the two sides of the interconnection switch again, the switching function is recovered.
The interconnection switch can traverse the topological graph from each power supply according to the topological graph of the power distribution network to find the power supplies connected on the two sides of the interconnection switch. This way the power supply across all tie switches can be found. But the connection relation of other interconnection switches is not concerned particularly for a certain interconnection switch.
In order to more quickly and conveniently find the power supplies on two sides of the interconnection switch, the invention uses a water flow simulating path algorithm to traverse the topological graph from the switch position and find the connected power supplies.
The interconnection switch is assumed to be a place with the highest water potential, the top end and the tail end (the power supply is at the top end or the tail end) of the topological graph are places with the lowest water potential, the position-dividing switch is similar to a water gate open circuit, so that the interconnection switch A side and the interconnection switch B side with the highest water potential simultaneously start to spread to the place with the lowest water potential, and when a bus position is met, a water flow fork is met, the water flow branches flow away, and the water flow flows to the lowest water potential. And judging whether the lowest point is powered on or not, and finishing the search.
The algorithm comprises the following steps:
step A, the interconnection switch traverses the topological graph towards two sides.
And step B, if meeting a closing switch, continuing traversing, and if meeting a separating switch, stopping.
And C, stopping if the top or the tail end of the topological graph is reached.
And if the two sides have paths to the power supply in the traversal result, finishing the search.
See fig. 2. The communication switches are G1-5, G2-5, G3-5, G2-2, G2-8, G2, G5 and G8. In the figure, the underlined switches are tie switches.
Due to the change of the operation mode, the switch G3-8 is opened to become the tie switch, and the tie switch G2-8 is closed, as shown in FIG. 3, the underlined switch is the tie switch.
The switch G3-8 is in the split state, and power supply points are respectively searched towards two sides until the top or the tail end of the topological graph or the split state is switched.
In fig. 3, the tie switch G3-8 is routed to the upper side:
G3-8-G2-9-G2-8-G1-9-G1-8-Power supply 1
G3-8―>G2-9―>G2-7―>g6―>g19
G3-8―>G2-9―>G2-7―>g6―>g20
G3-8―>G2-9―>G2-7―>g6―>g5
G3-8―>G2-9―>G2-5
G3-8―>G2-9―>G2-8―>G1-9―>G1-7―>g3―>g14
G3-8―>G2-9―>G2-8―>G1-9―>G1-7―>g3―>g15
G3-8―>G2-9―>G2-8―>G1-9―>G1-7―>g3―>g2
G3-8―>G2-9―>G2-8―>G1-9―>G1-5
In fig. 3, the tie switch G3-8 seeks the path to the lower side as:
G3-8-G3-9-Power supply 3
G3-8―>G3-7―>g9―>g24
G3-8―>G3-7―>g9―>g25
G3-8―>G3-7―>g9―>g8
G3-8―>G3-5
It can be seen that there is only one power source connected to both sides of the tie switch G3-8. After the power source is found, traversal of the topology graph can be stopped.
After finding the power supply point, simultaneously recording the path between the power supplies:
power supply 3< -G3-9< -G3-8- > G2-9- > G2-8- > G1-9- > G1-8- > Power supply 1.
After the path is recorded, if the switch state on the 2 × t1 time path is not changed, the path is locked, the broadcasting interconnection switch is locked, other interconnection switches also use the above water flow simulating path algorithm to search for a power supply, and the interconnection switch on the bus only needs to search for the power supply without recording the path.
Claims (7)
1. A power supply searching method based on a water flow simulating path algorithm is suitable for a power distribution network powered by a plurality of power supplies and is realized based on a topological graph of the power distribution network.
2. The method of claim 1, wherein after the change of the tie switch, the tie switch determines the lines to the power source on both sides of the tie switch, and if the lines have no or a switch and are in a closed state, the change is successful.
3. The method of claim 2, wherein all switches send a heartbeat message every t1, the heartbeat message including the switch status; after the interconnection switch is replaced, the interconnection switch judges the lines from two sides of the interconnection switch to the power supply, and if the lines are not provided with switches or provided with switches and are in a closed state and are maintained for 2 × t1 time, the replacement is successful.
4. A method according to claim 1, characterized in that before a change of contact switch in the electricity distribution network is successful, the new contact switch broadcasts a contact switch change message, and the other contact switches receive the message and lock the transfer function; and after the interconnection switch finishes searching the power supplies connected with the two sides of the interconnection switch again, the switching function is recovered.
5. The method of claim 1, wherein the tie switches are re-addressed to the power sources connected on both sides thereof using a pseudo-water flow path algorithm based on the topology of the power distribution network and the state of each switch, the algorithm comprising the steps of:
step A, the interconnection switch traverses the topological graph to two sides,
step B, if meeting the on-position switch, continuing traversing, if meeting the off-position switch, stopping,
step C, stopping if the top end or the tail end of the topological graph is reached,
and if the two sides have paths to the power supply in the traversal result, finishing the search.
6. A method according to claim 1 or 5, characterized in that the tie switch registers the path to the power supply on both sides.
7. The method of claim 1, wherein when the distribution network fails, the tie switch of the power supply is configured to find the power supply to be converted, the switch nearest to the power supply and the upstream switch of the failure point, obtain the real-time load P2 of the power supply to be converted and the load P3 of the upstream switch before the failure, and then judge according to the maximum available load P1 of the power supply to be converted:
if (P1-P2) K > P3, the tie switch is closed;
wherein K is a transfer coefficient and takes a value of 0.2-1.
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