CN114725940A - Power distribution network power supply recovery method and device, terminal equipment and storage medium - Google Patents
Power distribution network power supply recovery method and device, terminal equipment and storage medium Download PDFInfo
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- CN114725940A CN114725940A CN202210643844.2A CN202210643844A CN114725940A CN 114725940 A CN114725940 A CN 114725940A CN 202210643844 A CN202210643844 A CN 202210643844A CN 114725940 A CN114725940 A CN 114725940A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a power distribution network power supply recovery method, a device, terminal equipment and a storage medium, wherein the method comprises the steps of obtaining the total load, the standby power supply load capacity and the state data of all contact feeder lines of a power distribution network power supply area, and calculating to obtain a power transfer priority value of each contact feeder line; performing priority ordering on all contact feeders based on the power supply transfer priority value of each contact feeder to generate a contact feeder set; sequentially selecting a contact feeder line meeting the preset capacity requirement from the contact feeder line set, and closing a contact switch between the contact feeder line and an area to be powered; calling a load flow calculation program to verify the connecting feeder line, and generating a candidate recovery mode when the verification is judged to be passed; and executing the first ordered candidate restoration mode to restore the power supply of the area to be powered. The invention selects the contact feeder line according to the priority of the supply transfer state, avoids the line tripping after the contact switch is closed, and improves the power supply reliability of the power distribution network.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network power supply recovery method and device, terminal equipment and a storage medium.
Background
One of the important goals of power distribution network construction is to improve the power supply reliability, and feeder automation is an important technical means for improving the power supply reliability of the power distribution network. When a line fails, the power distribution terminal can realize fault judgment and automatic isolation of a fault area so as to complete power supply recovery of a feeder area of the power distribution network.
At present, use stand-by power supply when the power supply resumes usually, stand-by power supply passes through the contact switch, contacts the feeder and is connected with the distribution network, just can resume the power supply through closed stand-by power supply and the contact switch between the region of waiting to supply power. However, since a plurality of contact switches are arranged on the contact feeder line corresponding to the standby power supply and correspond to different power supply areas, when a fixed contact switch is selected to be closed in the prior art, a circuit is easy to trip, and the power supply reliability of the power distribution network is affected.
Disclosure of Invention
The invention provides a power distribution network power supply recovery method, a power distribution network power supply recovery device, terminal equipment and a storage medium, and aims to solve the technical problem that the power distribution network power supply reliability is influenced by circuit tripping easily caused by selecting a fixed contact switch to be closed in the prior art.
In a first aspect, to solve the above technical problem, the present invention provides a power supply restoration method for a power distribution network, including:
acquiring total load of a power distribution network area to be supplied with power, load capacity of a standby power supply for power transfer and state data of all contact feeder lines for power transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
calculating to obtain a power transfer priority value of each contact feeder line according to the load capacity of the standby power supply and the state data of all the contact feeder lines;
performing priority ordering on all contact feeders based on the power supply transfer priority value of each contact feeder to generate a contact feeder set, sequentially selecting the contact feeders meeting the preset capacity requirement from the contact feeder set, and closing contact switches between the contact feeders meeting the capacity requirement and an area to be supplied with power; wherein the capacity requirement is that the minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
calling a load flow calculation program to check the contact feeders meeting the capacity requirement in sequence, and generating a candidate recovery mode when the checking is judged to be passed until all the contact feeders meeting the capacity requirement are checked; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and selecting a first ordered candidate recovery mode from all the candidate recovery modes, and executing the first ordered candidate recovery mode to recover the power supply of the area to be powered.
Preferably, after the verification of all contact feeders meeting the capacity requirement is completed, the method further comprises:
when all the contact feeder lines are judged to be failed in verification, two contact feeder lines meeting the preset load requirement are sequentially selected from the contact feeder line set, two contact switches between the two contact feeder lines and an area to be powered are closed, and an initial section switch between the two contact switches is opened; wherein the load requirement is
，
For the minimum tie switch capacity corresponding to the first tie feeder,
for the minimum tie switch capacity corresponding to the second tie feeder,
is the total load;
calling a load flow calculation program to verify the two contact feeder lines, and generating a candidate recovery mode when the two contact feeder lines are judged to pass the verification;
and returning to the step of sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set until all the contact feeder lines meeting the load requirement are combined to complete verification.
Preferably, after the step of verifying the two contact feeders by the calling power flow calculation program, the method further comprises:
when one of the two contact feeder lines is judged to pass the verification and the other contact feeder line is judged to not pass the verification, the initial section switch is closed, and the next-stage section switch of the initial section switch in the direction of the contact feeder line which does not pass the verification is opened;
calling the load flow calculation program again to verify the two contact feeder lines, and judging whether the two contact feeder lines pass the verification; if yes, generating a candidate recovery mode;
and if not, updating the initial section switch to the next-stage section switch, returning to the step of closing the initial section switch and opening the next-stage section switch of the initial section switch in the direction of the interconnection feeder line which does not pass the verification until all section switches or any section switch between the two interconnection switches is repeatedly opened.
Preferably, before the step of opening an initial section switch between two of the tie switches, the method further comprises:
selecting an initial section switch between the two interconnection switches so as to minimize the difference between the ratio of the switching power supply priority values of the two interconnection feeders and the ratio of the first area load and the second area load; the initial section switch divides a region to be powered into a first region and a second region.
Preferably, the selecting process of the initial section switch includes:
calculating the ratio of the power transfer priority values of the two contact feeder lines, and recording the ratio as a first ratio;
selecting a section switch between the two interconnection switches, and dividing a region to be powered into a first region and a second region by taking the section switch as a boundary;
calculating the ratio of the load of the first area to the load of the second area, and recording the ratio as a second ratio;
calculating the difference or ratio of the first ratio and the second ratio, and recording the absolute value of the difference or the ratio;
returning to the step of selecting the section switches between the two interconnection switches until all the section switches are selected once;
outputting the section switch corresponding to the minimum value in the absolute values of all the difference values as an initial section switch; or outputting the section switch corresponding to the ratio closest to 1 in all the ratios as the initial section switch.
Preferably, the calculation formula of the power transfer priority value is as follows:
wherein the content of the first and second substances,Qa priority value for transferring power;
in order to minimize the capacity of the tie switch,
，
are respectively the firstiRated current, actual current of the strip branch;Kin order to determine the impact factor of the power failure,Sis a standby power supply load capacity;R 1the trip risk factor for the contact feeder for equipment reasons,R 2trip risk system for non-equipment cause contact feederThe number of the first and second groups is,ω 1andω 2are the weight coefficients.
Preferably, the calling load flow calculation program checks the contact feeder line, and includes:
carrying out current verification and voltage verification on the interconnection feeder;
when it satisfies
If so, judging that the current check is passed; wherein the content of the first and second substances,
is as followsiThe actual current of the strip branch is,
is as followsiA strip branch rated current;
when it is satisfied with
If so, judging that the voltage check is passed; wherein the content of the first and second substances,
is as followsiThe actual voltage of the individual nodes is,
are respectively the firstiThe lowest voltage value and the highest voltage value allowed by each node;
judging whether the current check and the voltage check pass or not, and if yes, judging that the check passes; if not, the verification is judged not to pass.
In a second aspect, the present invention provides a power distribution network power supply recovery device, including:
the data acquisition module is used for acquiring the total load of a power distribution network power supply area, the load capacity of a standby power supply for power transfer and the state data of all contact feeder lines for power transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
the priority value calculation module is used for calculating and obtaining a power transfer priority value of each contact feeder line according to the standby power supply load capacity and the state data of all the contact feeder lines;
the feeder line selection module is used for carrying out priority ordering on all the contact feeder lines based on the power supply switching priority value of each contact feeder line to generate a contact feeder line set, sequentially selecting the contact feeder lines meeting the preset capacity requirement from the contact feeder line set, and closing contact switches between the contact feeder lines meeting the capacity requirement and an area to be supplied with power; wherein the capacity requirement is that a minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
the load flow inspection module is used for calling a load flow calculation program to sequentially verify the contact feeder lines meeting the capacity requirement, and when the verification is judged to be passed, a candidate recovery mode is generated until all the contact feeder lines meeting the capacity requirement are verified; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and the power supply recovery module is used for selecting the first ranked candidate recovery mode from all the candidate recovery modes and recovering the power supply of the area to be powered according to the first ranked candidate recovery mode.
In a third aspect, the present invention further provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the power supply restoration method for the power distribution network described in any one of the above when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute any one of the foregoing power distribution network power supply restoration methods.
Compared with the prior art, the invention has the following beneficial effects:
the power supply recovery method for the power distribution network comprises the steps of firstly obtaining the total load of a region to be powered of the power distribution network, the load capacity of a standby power supply for power transfer and state data of all contact feeders for power transfer, then calculating to obtain the power transfer priority value of each contact feeder, sequentially selecting the contact feeders according to the power transfer priority values, and closing contact switches between the contact feeders meeting the capacity requirements and the region to be powered; and then calling a load flow calculation program to check in sequence, generating candidate recovery modes when the check is passed, and finally recovering the power supply of the area to be powered according to the first ranked candidate recovery mode. According to the method and the device, the power supply transfer priority value of each contact feeder is calculated according to the load capacity of the standby power supply, the minimum contact switch capacity, the trip risk coefficient and the outage influence coefficient, priority ranking is carried out on the contact feeders, the contact feeders can be selected according to the power supply transfer state priority, the corresponding contact switches are controlled to be closed to realize power supply of the area to be supplied with power, the risk of line trip after the contact switches are closed is further avoided, and the power supply reliability of the power distribution network is effectively improved.
Drawings
Fig. 1 is a schematic flow chart of a power supply restoration method for a power distribution network according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply restoration device for a power distribution network according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention provides a power distribution network power supply recovery method, including the following steps:
s11, acquiring the total load of the power distribution network power supply area, the load capacity of the standby power supply for power transfer and the state data of all contact feeder lines for power transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
s12, calculating the power transfer priority value of each contact feeder according to the load capacity of the standby power supply and the state data of all contact feeders;
s13, performing priority ordering on all contact feeders based on the power supply switching priority value of each contact feeder to generate a contact feeder set, sequentially selecting the contact feeders meeting the preset capacity requirement from the contact feeder set, and closing contact switches between the contact feeders meeting the capacity requirement and an area to be powered; wherein the capacity requirement is that the minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
s14, calling a load flow calculation program to verify the contact feeder lines meeting the capacity requirement, and generating a candidate recovery mode when the verification is judged to be passed until all the contact feeder lines meeting the capacity requirement are verified; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and S15, selecting the first candidate restoration mode from all the candidate restoration modes, and restoring the power supply of the area to be powered according to the first candidate restoration mode.
It should be noted that the invention is applied to the power supply recovery stage after the fault discrimination and positioning of the power distribution network. When a feeder line of the power distribution network has a fault, fault judgment is carried out firstly, then a fault area is isolated, and finally power supply recovery of the feeder line area of the power distribution network is carried out.
In step S11, the total load of the power distribution network to be supplied with power needs to be acquired first. The total load of the power distribution network to be supplied can be calculated according to the total load of the nodes before the feeder line of the power distribution network fails and the total load of the non-failure nodes obtained after the feeder line of the power distribution network fails. In specific implementation, node state information can be obtained through each FTU (Feeder Terminal Unit) on a Feeder of a power distribution network, so as to obtain a total load of a node before a fault and a total load of a non-fault node after the fault, and then calculate to obtain a total load of an area to be powered.
Further, backup power load capacity for the tranfer and all contact feeder status data for the tranfer are obtained. In practical application, a power distribution network feeder area is provided with a standby power supply for transfer, and after fault isolation, the standby power supply load capacity can be used for power supply recovery. The stand-by power supply is connected with a plurality of interconnection feeders and interconnection switches, and power supply recovery is carried out on the area to be supplied with power through the interconnection feeders and the interconnection switches.
Wherein the tie feeder status data includes a minimum tie switch capacity, a trip risk factor, and a outage impact factor corresponding to a tie feeder. It should be noted that each tie feeder line is provided with a plurality of branches and a plurality of tie switches, which correspond to different areas respectively and can supply power to different areas. In order to avoid the tripping risk of the contact feeder line after the contact switch is closed, the minimum value of the spare capacity in the branch of the contact feeder line connected with the spare power supply needs to be acquired for judging whether the capacity requirement is met, and the minimum value of the spare capacity in the branch of the contact feeder line is the minimum contact switch capacity.
In particular, the trip risk factor includes a trip risk factor for the contact feeder due to equipment causesR 1Trip risk factor for contact feeders not due to equipmentR 2. In an exemplary manner, the first and second electrodes are,R 1the value of (a) is the average operating life of the equipment,R 2the value of (a) is the trip times of the contact feeder line in the preset operation time, and the operation time is the value according to the requirement, such as the trip times in the past 12 months. The outage impact coefficient characterizes the severity of the consequences of a sudden outage, which can be 1-3 depending on its severity.
In step S12, a transfer power priority value of each contact feeder is calculated according to the backup power load capacity and the status data of all contact feeders. Specifically, the calculation formula of the switching power supply priority value is as follows:
wherein, the first and the second end of the pipe are connected with each other,Qa priority value for transferring power;
in order to minimize the capacity of the tie switch,
，
are respectively the firstiRated current, actual current of the strip branch;Kthe power failure influence coefficient can be 1-3 according to the severity;Sis a standby power supply load capacity;R 1the trip risk factor for the contact feeder for equipment reasons,R 2for non-equipment-cause trip risk factors of the contact feeder,ω 1andω 2and the weight coefficient is corrected according to the trip proportion of the local equipment reason and the non-equipment reason.
In step S13, all the contact feeders are prioritized based on the power transfer priority value of each contact feeder, and a contact feeder set is generated. And then, sequentially selecting the contact feeders meeting the preset capacity requirement from the contact feeder set, and then closing contact switches between the contact feeders meeting the capacity requirement and the area to be supplied with power. After the power supply conversion priority value of the contact feeder is calculated, the contact feeders can be selected according to the power supply conversion priority value in descending order, and then the corresponding contact switches are controlled to be closed to realize power supply of the area to be powered, so that the risk of line tripping after the contact switches are closed is avoided, and the power supply reliability of the power distribution network is improved. Wherein the capacity requirement is
，
For the minimum tie switch capacity corresponding to the tie feeder,
is the total load. When minimum contact switch capacity satisfies the capacity requirement, can avoid contact feeder sudden tripping operation after the switch closure, increase the stability of power supply.
In step S14, a load flow calculation program is called to verify the contact feeders meeting the capacity requirement, and when it is determined that the verification is passed, candidate recovery modes are generated until all the contact feeders meeting the capacity requirement are verified.
It should be noted that, in this step, in order to verify whether the tie switch corresponding to each tie feeder meeting the capacity requirement can implement power restoration, the tie feeders are sequentially selected according to the power transfer priority value until all the tie feeders meeting the capacity requirement are verified. In the selection process, the same contact feeder line cannot be selected repeatedly.
In this embodiment, the verifying the contact feeder line by the call load flow calculation program includes:
carrying out current verification and voltage verification on the interconnection feeder;
when it satisfies
If so, judging that the current check is passed; wherein the content of the first and second substances,
is a firstiThe actual current of the strip branch is,
is as followsiA strip branch rated current;
when it is satisfied with
If so, judging that the voltage check is passed; wherein the content of the first and second substances,
is a firstiThe actual voltage of the individual nodes is,
are respectively the firstiThe lowest voltage value and the highest voltage value allowed by each node;
judging whether the current check and the voltage check pass or not, and if so, judging that the check passes; if not, the verification is judged not to pass.
In one embodiment, a verification feeder set is generated according to all contact feeders meeting the capacity requirement of the contact feeder set, contact feeders in the verification feeder set are sequentially selected according to the sequence, a contact switch between each contact feeder and an area to be supplied with power is closed, then a load flow calculation program is called for verification, and if the verification is passed, a candidate recovery mode is generated; and if the verification is not passed, deleting the contact feeder line from the verification feeder line set, then selecting the next contact feeder line in the verification feeder line set, and repeating the steps until the verification feeder line set is an empty set. Through the implementation mode, whether the power supply recovery can be realized by the tie switch corresponding to each tie feeder line meeting the capacity requirement can be verified. In the selection process, the same contact feeder line cannot be selected repeatedly.
In step S15, a first ranked candidate restoration manner is selected from all the candidate restoration manners, and power supply to the area to be powered is restored according to the first ranked candidate restoration manner. It should be noted that the candidate restoration means includes closing a tie switch between the tie feeder and the area to be powered. The embodiment of the invention has a plurality of candidate recovery modes, all the candidate recovery modes are sorted based on the generated sequence, and are sequentially selected according to the generated sequence during application, and if the recovery cannot be performed or the user requirement cannot be met, the next candidate recovery mode is selected.
In order to facilitate an understanding of the invention, some preferred embodiments of the invention will now be described.
In one implementation, after the step of verifying the contact feeder line by the calling load flow calculation program, the method further includes:
s21, when all the contact feeders are judged to beWhen the verification fails, sequentially selecting two contact feeders meeting the preset load requirement from the contact feeder set, closing two contact switches between the two contact feeders and an area to be powered, and opening an initial section switch between the two contact switches; wherein the load requirement is
，
For the minimum tie switch capacity corresponding to the first tie feeder,
for the minimum tie switch capacity corresponding to the second tie feeder,
is the total load;
s22, calling a load flow calculation program to verify the two contact feeder lines, and generating a candidate recovery mode when the two contact feeder lines are judged to pass the verification;
and S23, returning to the step of sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set until all the contact feeder lines meeting the load requirement are combined to complete verification.
It should be noted that the verification in step S15 includes performing current verification and voltage verification on the connecting feeder, so that there is a case where the verification fails, and the preferred embodiment is further described with respect to the case where the verification fails.
In step S21, when all the contact feeders are judged to be failed in verification, two contact feeders meeting the load requirement in the contact feeder set are sequentially selected according to the sorting, so as to form a contact feeder combination. Then two tie switches between the two tie feeders and the area to be powered are closed, and an initial section switch between the two tie switches is opened.
It should be noted that, in the process of sequentially selecting two feeder lines to form a combination, if there are n different elements in the contact feeder line set, the number of all combinations is C (n, 2). And selecting according to the form of C (n,2), and not repeatedly selecting to obtain the same combination. Meanwhile, according to the switching power supply priority value, the contact feeder which is ranked at the top has higher priority and can be selected preferentially. Illustratively, the contact feeder set comprises 1,2,3 and 4 four contact feeders, and the selection sequence of the contact feeder combination is 12, 13, 14, 23, 24 and 34.
Wherein the load requirement is
，
For the minimum tie switch capacity corresponding to the first tie feeder,
for the minimum tie switch capacity corresponding to the second tie feeder,
is the total load. At the moment, when the minimum interconnection switch capacity of the two selected interconnection feeders meets the load requirement, sudden tripping of the interconnection feeders after the switch is closed can be avoided, and the power supply stability is improved.
Further, the initial section switch divides an area to be powered into a first area and a second area. In order to transfer the load of the interconnection feeder line and improve the utilization rate of the load capacity of the standby power supply, an initial section switch between the two interconnection switches is selected so as to minimize the difference between the ratio of the transfer power priority values of the two interconnection feeder lines and the ratio of the first area load and the second area load.
In one embodiment, the selecting process of the initial section switch includes:
calculating the ratio of the power transfer priority values of the two contact feeder lines, and recording the ratio as a first ratio;
selecting a section switch between the two interconnection switches, and dividing a region to be powered into a first region and a second region by taking the section switch as a boundary;
calculating the ratio of the load of the first area to the load of the second area, and recording the ratio as a second ratio;
calculating the difference or ratio of the first ratio and the second ratio, and recording the absolute value of the difference or the ratio;
returning to the step of selecting the section switches between the two interconnection switches until all the section switches are selected once;
outputting the section switch corresponding to the minimum value in the absolute values of all the difference values as an initial section switch; or outputting the section switch corresponding to the ratio closest to 1 in all the ratios as the initial section switch.
The calculation formula of the switching power priority value is already described in step S12, and is not described herein. Specifically, the first ratio and the second ratio are calculated once every time one section switch is selected. Illustratively, m section switches are provided, and after all the section switches are selected once, the difference between m first ratios and m second ratios can be obtained, and then an absolute value is obtained, or the ratio between m first ratios and m second ratios can be obtained. And then, outputting the section switch corresponding to the minimum value in the m absolute values as an initial section switch, or outputting the section switch corresponding to the ratio closest to 1 in the m ratios as the initial section switch. Wherein the absolute value of the difference between m ratios and 1 may be calculated to determine the ratio closest to 1 of the m ratios. All section switches are selected for calculation verification in the embodiment, calculation accuracy can be improved, and stable recovery of power supply is facilitated.
In another embodiment, the selecting process of the initial section switch includes:
selecting a preset section switch between the two interconnection switches, a previous section switch of the preset section switch and a next section switch of the preset section switch;
respectively calculating the absolute values of the difference values of the first ratio and the second ratio corresponding to the three section switches;
and outputting the section switch corresponding to the minimum value of the three absolute values of the difference values as an initial section switch. The preset section switch is configured in advance according to user requirements, for example, a section switch close to the middle part between the two interconnection switches. The difference between this embodiment and the previous embodiment is only that in this embodiment, only three section switches are selected for calculation verification, which can simplify the calculation flow and is beneficial to realizing the quick recovery of power supply. The specific calculation of the first ratio and the second ratio is the same as that of the previous embodiment, and is not described herein again.
In steps S22 and S23, a power flow calculation program is called to verify the two contact feeders. The verification result has three conditions, including that two contact feeder lines pass verification, one contact feeder line passes verification, the other contact feeder line does not pass verification, and the two contact feeder lines do not pass verification. After the two contact feeder lines are verified, in any case, the step of sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set is returned to until all the contact feeder lines meeting the load requirement are combined to complete verification. The specific criteria for performing the verification through the power flow calculation program are already described in step S15, and are not described herein again.
Specifically, when both the contact feeders are judged to pass the verification, a candidate recovery mode is generated. At this time, the two selected interconnection feeders can meet the load requirement, the voltage requirement and the current requirement, and the corresponding interconnection switches can be closed to supply power.
Further, when one of the two contact feeder lines is judged to pass the verification and the other contact feeder line is judged to not pass the verification, the initial section switch is closed, and the next-stage section switch of the initial section switch in the direction of the contact feeder line which does not pass the verification is opened;
calling a load flow calculation program again to check the two contact feeder lines, and judging whether the two contact feeder lines pass through the check; if yes, generating a candidate recovery mode;
and if not, updating the initial section switch to the next-stage section switch, returning to the step of closing the initial section switch and opening the next-stage section switch of the initial section switch in the direction of the interconnection feeder line which does not pass the verification until all section switches or any section switch between the two interconnection switches is repeatedly opened.
In this embodiment, the section switches between the two interconnection switches are repeatedly selected, so that the loads in the two areas can be redistributed, and whether the two selected interconnection feeders can meet the power supply requirement is judged again, the judgment again of the interconnection feeders with the front contra-rotating power supply priority can be realized, the diversity of the power supply recovery mode is further increased, and the actual operation requirement of the current power distribution network is better met.
Further, when it is determined that both the two contact feeder lines are not verified, the step of sequentially selecting two contact feeder lines meeting the load requirement in the contact feeder line set according to the sequence is directly returned, so that the next group of contact feeder line combinations meeting the load requirement is selected until all contact feeder line combinations are verified.
In one embodiment, all the candidate recovery manners generated in step S14, step S22, and step S23 are sorted according to the generated sequence, and then the power supply of the area to be powered is recovered according to the first candidate recovery manner of the sorting.
In the embodiment of the invention, the total load of a power distribution network power supply area, the load capacity of a standby power supply for power transfer and the state data of all contact feeders for power transfer are firstly obtained, then the power transfer priority value of each contact feeder is obtained through calculation, contact feeders are sequentially selected according to the power transfer priority value, and contact switches between the contact feeders and the power supply area are closed; and then, calling a load flow calculation program for verification, generating a candidate recovery mode when the verification is passed, and finally recovering the power supply of the area to be powered according to the first ranked candidate recovery mode. According to the method and the device, the power transfer priority value of each contact feeder is calculated according to the load capacity of the standby power supply, the minimum contact switch capacity, the trip risk coefficient and the outage influence coefficient, the contact feeders are sequenced, the contact feeders can be selected according to the power transfer state priority, the corresponding contact switches are controlled to be closed to supply power to the area to be supplied with power, the risk of line trip after the contact switches are closed is avoided, and the power supply reliability of the power distribution network is effectively improved.
Referring to fig. 2, a second embodiment of the present invention provides a power distribution network power supply recovery device, including:
the data acquisition module is used for acquiring the total load of a power distribution network power supply area, the load capacity of a standby power supply for power transfer and the state data of all contact feeder lines for power transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
the priority value calculation module is used for calculating and obtaining a power transfer priority value of each contact feeder line according to the standby power supply load capacity and the state data of all the contact feeder lines;
the feeder line selection module is used for carrying out priority ordering on all the contact feeder lines based on the power supply switching priority value of each contact feeder line to generate a contact feeder line set, sequentially selecting the contact feeder lines meeting the preset capacity requirement from the contact feeder line set, and closing contact switches between the contact feeder lines meeting the capacity requirement and an area to be supplied with power; wherein the capacity requirement is that a minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
the load flow inspection module is used for calling a load flow calculation program to sequentially verify the contact feeder lines meeting the capacity requirement, and when the verification is judged to be passed, a candidate recovery mode is generated until all the contact feeder lines meeting the capacity requirement are verified; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and the power supply recovery module is used for selecting the first ranked candidate recovery mode from all the candidate recovery modes and recovering the power supply of the area to be powered according to the first ranked candidate recovery mode.
Preferably, the apparatus further comprises:
the second selection module is used for sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set when all the contact feeder lines are judged to be failed in verification, closing two contact switches between the two contact feeder lines and an area to be powered, and opening an initial section switch between the two contact switches; wherein the load requirement is
，
For the minimum tie switch capacity corresponding to the first tie feeder,
the minimum tie switch capacity for the second tie feeder,
is the total load;
the second inspection module is used for calling a load flow calculation program to verify the two contact feeder lines, and when the two contact feeder lines are judged to pass the verification, a candidate recovery mode is generated;
and the return module is used for returning to the step of sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set until all the contact feeder line combinations meeting the load requirement complete verification.
Preferably, the apparatus further comprises:
the third selection module is used for closing the initial section switch and opening the next section switch of the initial section switch in the direction of the communication feeder line which does not pass the verification when one of the two communication feeder lines passes the verification and the other communication feeder line fails the verification;
the third inspection module is used for calling the load flow calculation program again to verify the two contact feeder lines and judging whether the two contact feeder lines pass the verification; if yes, generating a candidate recovery mode;
and if not, updating the initial section switch to the next-stage section switch, returning to the step of closing the initial section switch and opening the next-stage section switch of the initial section switch in the direction of the interconnection feeder line which does not pass the verification until all section switches or any section switch between the two interconnection switches is repeatedly opened.
It should be noted that the power distribution network power supply recovery device provided in the embodiment of the present invention is configured to execute all the process steps of the power distribution network power supply recovery method in the above embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
The embodiment of the invention also provides the terminal equipment. The terminal device includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a power distribution grid power restoration program. The processor, when executing the computer program, implements the steps in each of the above embodiments of the power distribution network power supply restoration method, for example, step S11 shown in fig. 1. Alternatively, the processor implements the functions of the modules/units in the above-mentioned device embodiments when executing the computer program, for example, the priority value calculation module.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The terminal device can be a desktop computer, a notebook, a palm computer, an intelligent tablet and other computing devices. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the above components are merely examples of a terminal device and do not constitute a limitation of a terminal device, and that more or fewer components than those described above may be included, or certain components may be combined, or different components may be included, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, said processor being the control center of said terminal device, and various interfaces and lines are used to connect the various parts of the whole terminal device.
The memory may be used for storing the computer programs and/or modules, and the processor may implement various functions of the terminal device by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the terminal device integrated module/unit can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (10)
1. A power distribution network power supply recovery method is characterized by comprising the following steps:
acquiring total load of a power distribution network area to be supplied with power, standby power supply load capacity for transfer and state data of all contact feeder lines for transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
calculating to obtain a power transfer priority value of each contact feeder line according to the load capacity of the standby power supply and the state data of all the contact feeder lines;
performing priority ordering on all contact feeders based on the power supply transfer priority value of each contact feeder to generate a contact feeder set, sequentially selecting the contact feeders meeting the preset capacity requirement from the contact feeder set, and closing contact switches between the contact feeders meeting the capacity requirement and an area to be supplied with power; wherein the capacity requirement is that the minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
calling a load flow calculation program to check the contact feeders meeting the capacity requirement in sequence, and generating a candidate recovery mode when the checking is judged to be passed until all the contact feeders meeting the capacity requirement are checked; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and selecting a first ordered candidate recovery mode from all the candidate recovery modes, and executing the first ordered candidate recovery mode to recover the power supply of the area to be powered.
2. The method for recovering power supplied to the power distribution network according to claim 1, wherein after the verification of all the contact feeders meeting the capacity requirement is completed, the method further comprises:
when all the contact feeder lines are judged to be failed in verification, two contact feeder lines meeting the preset load requirement are sequentially selected from the contact feeder line set, two contact switches between the two contact feeder lines and an area to be powered are closed, and an initial section switch between the two contact switches is opened; wherein the load requirement is
，
For the minimum tie switch capacity corresponding to the first tie feeder,
for the minimum tie switch capacity corresponding to the second tie feeder,
is the total load;
calling a load flow calculation program to verify the two contact feeder lines, and generating a candidate recovery mode when the two contact feeder lines are judged to pass the verification;
and returning to the step of sequentially selecting two contact feeder lines meeting the preset load requirement from the contact feeder line set until all the contact feeder lines meeting the load requirement are combined to complete verification.
3. The method for recovering power supplied to the power distribution network according to claim 2, wherein after the step of verifying the two contact feeders by calling the power flow calculation program, the method further comprises:
when one of the two contact feeder lines is judged to pass the verification and the other contact feeder line is judged not to pass the verification, the initial section switch is closed, and the next-stage section switch of the initial section switch in the direction of the contact feeder line which does not pass the verification is opened;
calling a load flow calculation program again to check the two contact feeder lines, and judging whether the two contact feeder lines pass through the check; if yes, generating a candidate recovery mode;
and if not, updating the initial section switch to the next-stage section switch, returning to the step of closing the initial section switch and opening the next-stage section switch of the initial section switch in the direction of the interconnection feeder line which does not pass the verification until all section switches or any section switch between the two interconnection switches is repeatedly opened.
4. The method of claim 2, wherein prior to the step of opening an initial sectionalizing switch between two of the tie switches, the method further comprises:
selecting an initial section switch between the two interconnection switches so as to minimize the difference between the ratio of the switching power supply priority values of the two interconnection feeders and the ratio of the first area load and the second area load; the initial section switch divides a region to be powered into a first region and a second region.
5. The method for recovering power supply of the power distribution network according to claim 4, wherein the selection process of the initial section switch comprises the following steps:
calculating the ratio of the power transfer priority values of the two contact feeder lines, and recording the ratio as a first ratio;
selecting a section switch between the two interconnection switches, and dividing a region to be powered into a first region and a second region by taking the section switch as a boundary;
calculating the ratio of the load of the first area to the load of the second area, and recording the ratio as a second ratio;
calculating the difference or ratio of the first ratio and the second ratio, and recording the absolute value of the difference or the ratio;
returning to the step of selecting the section switches between the two interconnection switches until all the section switches are selected once;
outputting the section switch corresponding to the minimum value in the absolute values of all the difference values as an initial section switch; or outputting the section switch corresponding to the ratio closest to 1 in all the ratios as the initial section switch.
6. The power distribution network power supply restoration method according to claim 1, wherein the calculation formula of the power transfer priority value is as follows:
wherein, the first and the second end of the pipe are connected with each other,Qa priority value for transferring power;
in order to minimize the capacity of the tie switch,
，
are respectively the firstiRated current, actual current of the strip branch;Kin order to determine the impact factor of the power failure,Sis a standby power supply load capacity;R 1the trip risk factor for the contact feeder for equipment reasons,R 2for non-equipment-cause trip risk factors of the contact feeder,ω 1andω 2are weight coefficients.
7. The power distribution network power supply restoration method according to claim 1, wherein the step of calling the load flow calculation program to verify the contact feeder line comprises the steps of:
carrying out current verification and voltage verification on the interconnection feeder;
when it is satisfied with
If so, judging that the current check is passed; wherein the content of the first and second substances,
is as followsiThe actual current of the strip branch is,
is a firstiA strip branch rated current;
when it is satisfied with
If so, judging that the voltage check is passed; wherein the content of the first and second substances,
is as followsiThe actual voltage of the individual nodes is,
are respectively the firstiThe lowest voltage value and the highest voltage value allowed by each node;
judging whether the current check and the voltage check pass or not, and if so, judging that the check passes; if not, the verification is judged not to pass.
8. A power distribution network power supply recovery device is characterized by comprising:
the data acquisition module is used for acquiring the total load of a power distribution network power supply area, the load capacity of a standby power supply for power transfer and the state data of all contact feeder lines for power transfer; wherein the tie feeder status data comprises a minimum tie switch capacity, a trip risk coefficient and a power outage impact coefficient corresponding to a tie feeder;
the priority value calculation module is used for calculating and obtaining a power transfer priority value of each contact feeder line according to the standby power supply load capacity and the state data of all the contact feeder lines;
the feeder line selection module is used for carrying out priority ordering on all the contact feeder lines based on the power supply switching priority value of each contact feeder line to generate a contact feeder line set, sequentially selecting the contact feeder lines meeting the preset capacity requirement from the contact feeder line set, and closing contact switches between the contact feeder lines meeting the capacity requirement and an area to be supplied with power; wherein the capacity requirement is that a minimum tie switch capacity corresponding to a tie feeder is greater than the total load;
the load flow inspection module is used for calling a load flow calculation program to sequentially verify the contact feeder lines meeting the capacity requirement, and when the verification is judged to be passed, a candidate recovery mode is generated until all the contact feeder lines meeting the capacity requirement are verified; wherein the candidate restoration manner comprises closing a tie switch between the tie feeder and an area to be powered;
and the power supply recovery module is used for selecting the first ordered candidate recovery mode from all the candidate recovery modes and executing the first ordered candidate recovery mode to recover the power supply of the area to be powered.
9. A terminal device, characterized by comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the power distribution network power supply restoration method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls an apparatus to execute the power supply restoration method according to any one of claims 1 to 7.
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