CN112542833A - Method for quickly recovering 10kV bus voltage loss of transformer substation - Google Patents
Method for quickly recovering 10kV bus voltage loss of transformer substation Download PDFInfo
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- CN112542833A CN112542833A CN202011436596.1A CN202011436596A CN112542833A CN 112542833 A CN112542833 A CN 112542833A CN 202011436596 A CN202011436596 A CN 202011436596A CN 112542833 A CN112542833 A CN 112542833A
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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]
Abstract
The invention discloses a method for quickly recovering 10kV bus voltage loss of a transformer substation, which comprises the following steps: step S1, setting a switching object according to the voltage-loss bus, selecting a section according to a fault scene, setting a switching limit value, forbidding a switching line and calculating parameters of a main distribution integrated load switching analysis function; s2, automatically generating a transfer scheme set of a transfer object by using a main distribution integration topology analysis technology according to the section and the parameters set in the S1, and selecting an optimal transfer scheme from the transfer scheme set; step S3, on the basis of the optimal transfer scheme, setting a disconnection switch and a connection switch according to the field condition, and recalculating to obtain an adjusted transfer detailed scheme and an adjusted overall scheme; and step S4, completing the quick power restoration through remote control according to the supply detail scheme and the whole scheme. The invention can help a dispatcher to quickly find a power transfer path under the condition that the 10kV bus of the transformer substation is in voltage loss, and improves the power supply reliability and the user service level.
Description
Technical Field
The invention relates to the technical field of distribution automation and distribution network operation analysis, in particular to a method for quickly recovering 10kV bus voltage loss of a transformer substation.
Background
Most of the conventional power distribution network fault isolation and power supply recovery methods are used for the situation that a single feeder fault occurs in a power distribution network, and are not suitable for 10kV bus voltage loss faults with large influence on power failure of the power distribution network in a large range. Under the above circumstances, the power transmission of the superior power grid cannot be recovered for a long time, which may cause the voltage loss of several 10kV buses, and in order to recover the power supply of the user as soon as possible, it is necessary to perform power transfer to tens or even hundreds of 10kV feeders by using a method of transferring power through a tie line.
Therefore, a method for quickly recovering the 10kV bus under the condition of voltage loss of the transformer substation is urgently needed, a dispatcher is helped to form the generation and verification work of a quick power recovery scheme, and the power failure time is shortened, so that the power supply reliability is improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for quickly recovering the 10kV bus voltage loss of the transformer substation, so as to support a user to quickly deal with the voltage loss of the 10kV bus of the transformer substation and improve the power supply reliability.
In order to solve the technical problem, an embodiment of the present invention provides a method for quickly recovering a 10kV bus of a transformer substation from a loss voltage, including:
step S1, setting a switching object according to the voltage-loss bus, selecting a section according to a fault scene, setting a switching limit value, forbidding a switching line and calculating parameters of a main distribution integrated load switching analysis function;
s2, automatically generating a transfer scheme set of a transfer object by using a main distribution integration topology analysis technology according to the section and the parameters set in the S1, and selecting an optimal transfer scheme from the transfer scheme set;
step S3, on the basis of the optimal transfer scheme, setting a disconnection switch and a connection switch according to the field condition, and recalculating to obtain an adjusted transfer detailed scheme and an adjusted overall scheme;
and step S4, completing the quick power restoration through remote control according to the supply detail scheme and the whole scheme.
Further, in step S2, the load transfer algorithm for the main-distribution integrated load transfer analysis specifically includes:
step S21, calculating to obtain a power transfer circuit and a power supply main transformer of a power transfer object by using a main distribution integrated topology analysis technology;
step S22, according to the real-time load and the maximum cross-section load of the feeder line included in the transfer object, the load of the transfer line and the power supply main transformer is obtained, and the load rate of the feeder line, the transfer line and the power supply main transformer included in the transfer object is obtained;
and step S23, confirming the optimal power supply transfer scheme according to the load rate of the power supply transfer line and the main transformer, the branding condition of the power supply transfer line, the number of operation switches and the number of important users carried by the power supply transfer line.
Further, the mode of selecting the optimal power conversion and supply scheme is as follows: the priority is gradually reduced from high to low load rate; the priority is gradually reduced from less operation switches to more operation switches; the number of important users carried by the supply transfer line is from small to large, and the priority is gradually reduced.
Further, the detailed scheme in step S3 is specifically to set an off switch, an on switch, a transfer object, and a transfer line load condition according to a field condition on the basis of the optimal transfer scheme obtained by the main-distribution integrated load transfer analysis.
Further, the overall scheme in step S3 is specifically that the switch influences the feeder line, the load, the user, the condition of the important user range, and the main transformer switching state according to the switching conclusion of the switching object obtained by summarizing the conditions of the switch off, the switch on, the switching object, and the switching line load in the detailed scheme.
Further, after the step S4, the method further includes:
step S5, performing statistics: according to the starting time input by a user, inquiring and counting the executed 10kV bus voltage loss quick recovery scheme of the transformer substation, and counting the number of feeder lines, the total load, the number of users and the number of important users related to power transfer.
The embodiment of the invention has the beneficial effects that: the system can help a dispatcher to quickly find a power transfer path under the condition that the 10kV bus of the transformer substation is in voltage loss, supports a user to quickly deal with the voltage loss of the 10kV bus of the transformer substation, and improves the power supply reliability and the user service level; the problem of large-scale long-time large-area power failure of the power distribution network caused by voltage loss of a 10KV bus of a transformer substation is solved; the efficiency of quick repowering when greatly having improved the large tracts of land power failure reduces the power off time by a wide margin to improve the power supply reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for rapidly recovering a 10kV bus of a substation from a loss voltage state in an embodiment of the invention.
Fig. 2 is a topological diagram of load transfer in an embodiment of the present invention.
Fig. 3 is an overview of the quick power restoration of the 10kV bus of the substation in the embodiment of the invention when the voltage is lost.
Fig. 4 is a detailed scheme diagram of the voltage-loss quick power restoration of the 10kV bus of the transformer substation in the embodiment of the invention.
Fig. 5 is a voltage-loss fast power restoration execution statistical diagram of the 10kV bus of the transformer substation in the embodiment of the invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, an embodiment of the present invention provides a method for quickly recovering a 10kV bus of a substation from a loss voltage, including:
step S1, setting a switching object according to the voltage-loss bus, selecting a section according to a fault scene, setting a switching limit value, forbidding a switching line and calculating parameters of a main distribution integrated load switching analysis function;
s2, automatically generating a transfer scheme set of a transfer object by using a main distribution integration topology analysis technology according to the section and the parameters set in the S1, and selecting an optimal transfer scheme from the transfer scheme set;
step S3, on the basis of the optimal transfer scheme, setting a disconnection switch and a connection switch according to the field condition, and recalculating to obtain an adjusted transfer detailed scheme and an adjusted overall scheme;
and step S4, completing the quick power restoration through remote control according to the supply detail scheme and the whole scheme.
Specifically, the method for quickly recovering the 10kV busbar voltage loss of the transformer substation provided by the embodiment of the invention is implemented based on a distribution master station system, and the distribution master station system has a main distribution integrated modeling function, a main distribution integrated load transfer analysis function and a transformer substation 10kV busbar voltage loss quick recovery function. The power distribution master station system completes the main distribution integrated modeling in advance and realizes the splicing of the main distribution network model.
In step S2, the load transfer algorithm for the main distribution integrated load transfer analysis specifically includes:
and step S21, calculating to obtain a power transfer circuit and a power supply main transformer of a power transfer object by using a main distribution integrated topology analysis technology.
As shown in fig. 2, by using S1 as a starting point, the topology analysis of the off-site device can obtain S2 and S3 as the transfer line of S1; the topology analysis is performed on the high-voltage side by S1, and the power supply main change of S1 can be obtained as P1.
And step S22, according to the real-time load and the maximum cross-section load of the feeder line included in the transshipment object, the loads of the transshipment line and the power supply main transformer are obtained, and the load rates of the feeder line, the transshipment line and the power supply main transformer included in the transshipment object are obtained. The load factor calculation formula of the power supply line and the power supply main transformer is as follows: load/rated load.
And step S23, selecting an optimal power supply switching scheme according to the load factor of the power supply switching line and the main transformer, the branding condition of the power supply switching line, the number of operation switches and the number of important users carried by the power supply switching line. The mode for selecting the optimal power conversion and supply scheme is as follows: the priority is gradually reduced from high to low load rate; the priority is gradually reduced from less operation switches to more operation switches; the number of important users carried by the supply transfer line is from small to large, and the priority is gradually reduced.
The detailed scheme in step S3 is to set the off switch, on switch, the transfer object and the load condition of the transfer line according to the field condition on the basis of the optimal transfer scheme obtained by the main distribution integrated load transfer analysis. The whole scheme refers to that the switch-over influences feeder lines, loads, users, important user range conditions and main transformer switch-over states according to switch-off, switch-on, switch-over object switch-over conclusion obtained by summarizing switch-over object switch-over conditions and switch-over line load conditions in the detailed scheme.
Further, after step S4, the method further includes:
step S5, performing statistics: according to the starting time input by a user, inquiring and counting the executed 10kV bus voltage loss quick recovery scheme of the transformer substation, and counting the number of feeder lines, the total load, the number of users and the number of important users related to power transfer. The execution of the statistical function can support the load transfer for analysis and practical application level.
As shown in fig. 3, which is an overview of main-distribution-coordinated 10kV bus voltage loss quick recovery, the main-distribution-coordinated 10kV bus voltage loss quick recovery method of the substation is applied to the system. A power distribution master station in the system needs to ensure that the splicing relation of a main network model and a distribution network model needs to be correct, the real-time current and the limit value of a 10kV line and a power supply main transformer need to be accurate, and the system has the functions of main and distribution integrated modeling, main and distribution integrated load transfer and supply analysis and quick substation 10kV bus voltage loss recovery.
Fig. 4 shows a detailed scheme diagram of the main distribution cooperative substation 10kV bus voltage loss rapid power restoration, which takes a 10kV bus as a unit to show a line name, a transfer conclusion, detailed reasons, a common power borrowing line, whether to self-heal, the number of important users to be supplied, whether to guarantee power supply, whether to surf the internet in a power plant, real-time/maximum current, a power borrowing line, a disconnecting switch, whether to be controllable, switching on a switch, whether to be controllable, real-time/maximum current before transfer, real-time/maximum current after transfer, a reload value/transfer limit value, a current load condition, a maximum load condition, more schemes, whether to be executed and remarked information.
As shown in fig. 5, the main-distribution-coordinated substation 10kV bus voltage loss rapid restoration execution statistical chart queries the executed substation 10kV bus voltage loss rapid restoration condition with the start time input by the user as a reference. And counting the transferring details and the counting conditions, wherein the counting conditions comprise the number of feeder lines, the total load, the number of important users, the number of power supply protection users and the number of low-voltage users.
As can be seen from the above description, the embodiments of the present invention have the following beneficial effects: the system can help a dispatcher to quickly find a power transfer path under the condition that the 10kV bus of the transformer substation is in voltage loss, supports a user to quickly deal with the voltage loss of the 10kV bus of the transformer substation, and improves the power supply reliability and the user service level; the problem of large-scale long-time large-area power failure of the power distribution network caused by voltage loss of a 10kV bus of a transformer substation is solved; the efficiency of quick repowering when greatly having improved the large tracts of land power failure reduces the power off time by a wide margin to improve the power supply reliability.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. A method for quickly recovering 10kV bus voltage loss of a transformer substation is characterized by comprising the following steps:
step S1, setting a switching object according to the voltage-loss bus, selecting a section according to a fault scene, setting a switching limit value, forbidding a switching line and calculating parameters of a main distribution integrated load switching analysis function;
s2, automatically generating a transfer scheme set of a transfer object by using a main distribution integration topology analysis technology according to the section and the parameters set in the S1, and selecting an optimal transfer scheme from the transfer scheme set;
step S3, on the basis of the optimal transfer scheme, setting a disconnection switch and a connection switch according to the field condition, and recalculating to obtain an adjusted transfer detailed scheme and an adjusted overall scheme;
and step S4, completing the quick power restoration through remote control according to the supply detail scheme and the whole scheme.
2. The method for rapidly recovering 10kV busbar voltage loss of the transformer substation according to claim 1, wherein in the step S2, the load transfer algorithm for the main-distribution integrated load transfer analysis specifically comprises:
step S21, calculating to obtain a power transfer circuit and a power supply main transformer of a power transfer object by using a main distribution integrated topology analysis technology;
step S22, according to the real-time load and the maximum cross-section load of the feeder line included in the transfer object, the load of the transfer line and the power supply main transformer is obtained, and the load rate of the feeder line, the transfer line and the power supply main transformer included in the transfer object is obtained;
and step S23, confirming the optimal power supply transfer scheme according to the load rate of the power supply transfer line and the main transformer, the branding condition of the power supply transfer line, the number of operation switches and the number of important users carried by the power supply transfer line.
3. The substation 10kV bus voltage loss rapid power restoration method according to claim 2, characterized in that the mode of selecting the optimal power conversion and supply scheme is as follows: the priority is gradually reduced from high to low load rate; the priority is gradually reduced from less operation switches to more operation switches; the number of important users carried by the supply transfer line is from small to large, and the priority is gradually reduced.
4. The method for rapidly recovering the 10kV substation bus under the condition of voltage loss according to claim 1, wherein the detailed scheme in the step S3 is specifically to set the conditions of a disconnecting switch, a connecting switch, a supply object and a supply line load according to the field condition on the basis of an optimal supply scheme obtained through main distribution integrated load supply and supply analysis.
5. The method for rapidly recovering the 10kV bus voltage loss of the transformer substation according to claim 4, wherein the overall scheme in the step S3 is specifically that the supply-transfer object supply-transfer conclusion obtained by summarizing the load conditions of the disconnecting switch, the closing switch, the supply-transfer object and the supply-transfer line in the detailed scheme influences feeder lines, loads, users, the condition of important user range and the state of main transformer supply-transfer.
6. The substation 10kV bus voltage loss quick recovery method according to claim 1, further comprising, after the step S4:
step S5, performing statistics: according to the starting time input by a user, inquiring and counting the executed 10kV bus voltage loss quick recovery scheme of the transformer substation, and counting the number of feeder lines, the total load, the number of users and the number of important users related to power transfer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113555871A (en) * | 2021-07-26 | 2021-10-26 | 国网天津市电力公司 | Intelligent main-distribution integrated load transfer method based on pruning algorithm |
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| US20150212534A1 (en) * | 2014-01-24 | 2015-07-30 | International Business Machines Corporation | Generating electric substation load transfer control parameters |
| CN108808675A (en) * | 2018-07-13 | 2018-11-13 | 广东电网有限责任公司 | A kind of substation power loss distribution turns the automatic generation method of power supply plan |
| CN109560543A (en) * | 2018-11-14 | 2019-04-02 | 广东电网有限责任公司江门供电局 | Dynamic contingency prediction scheme analysis method and system based on main distribution Integrated Model |
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| US20150212534A1 (en) * | 2014-01-24 | 2015-07-30 | International Business Machines Corporation | Generating electric substation load transfer control parameters |
| CN108808675A (en) * | 2018-07-13 | 2018-11-13 | 广东电网有限责任公司 | A kind of substation power loss distribution turns the automatic generation method of power supply plan |
| CN109560543A (en) * | 2018-11-14 | 2019-04-02 | 广东电网有限责任公司江门供电局 | Dynamic contingency prediction scheme analysis method and system based on main distribution Integrated Model |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555871A (en) * | 2021-07-26 | 2021-10-26 | 国网天津市电力公司 | Intelligent main-distribution integrated load transfer method based on pruning algorithm |
| CN113555871B (en) * | 2021-07-26 | 2023-10-31 | 国网天津市电力公司 | Intelligent main-distribution integrated load transfer method based on pruning algorithm |
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