CN112260243A - Method for reducing short-circuit current of transformer substation by using fault current limiter - Google Patents
Method for reducing short-circuit current of transformer substation by using fault current limiter Download PDFInfo
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- CN112260243A CN112260243A CN201911305468.0A CN201911305468A CN112260243A CN 112260243 A CN112260243 A CN 112260243A CN 201911305468 A CN201911305468 A CN 201911305468A CN 112260243 A CN112260243 A CN 112260243A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
Abstract
The invention provides a method for reducing short-circuit current of a transformer substation by utilizing a fault current limiter. The invention comprehensively utilizes various factors influencing the short-circuit current in the power grid, and has the advantages of clear thought, easy realization, strong practicability and the like.
Description
Technical Field
The invention relates to the field of analysis and calculation of short-circuit current of a power system, in particular to a method for reducing short-circuit current of a transformer substation by using a fault current limiter.
Background
With the rapid increase of the load of the power system and the close interconnection of the large power grids, the short-circuit current level of each level of power grid is continuously increased. Short-circuit currents are very harmful to the safe and stable operation of the power system and to the electrical equipment itself. Therefore, the short-circuit current of the power system is limited, so that the load of various electrical equipment such as a circuit breaker and the like is effectively reduced, the working reliability and the service life of the electrical equipment are improved, and the operation reliability of the electrical system is improved. Aiming at the problem that the short-circuit current exceeds the standard or the margin is insufficient in the power grid development process, the invention focuses on the limiting effect of the fault current limiter on the short-circuit current and provides a method for reducing the short-circuit current of the transformer substation by utilizing the fault current limiter.
Disclosure of Invention
The purpose of the invention is: aiming at the condition that the short-circuit current of a power grid exceeds the standard, a method for reducing the short-circuit current of a transformer substation by using a fault current limiter is provided, so that the short-circuit current level of the transformer substation can be reduced to the maximum extent by accessing the fault current limiter, and the safe and stable operation of a power system is guaranteed.
In order to achieve the above purpose, the solution of the invention is:
a method for reducing short-circuit current of a transformer substation by using a fault current limiter comprises the following steps:
step 1: calculating the short-circuit current of the bus branch and sequencing the result aiming at the bus with the standard-exceeding short-circuit current;
step 2: selecting a branch with large branch short-circuit current to configure a fault current limiter; wherein:
if the branch with larger branch short-circuit current is a main transformer, configuring a fault current limiter on a main transformer high/medium voltage side or a bus-coupled switch; if the branch with larger branch short-circuit current is a line, configuring a fault current limiter on the line;
and step 3: and calculating the influence of the denominator modes in different substations and the combined configuration modes of different branch fault current limiters on the short-circuit current limiting effect, and selecting the configuration mode with the best short-circuit current limiting effect.
Further, in step 2, if the branch with the larger branch short-circuit current is the main transformer, when the bus tie switch is configured with the fault current limiter, the number of sets of the fault current limiter is determined according to the number of the bus tie switches by combining the bus segmentation condition.
Further, in the step 2, the step of determining the number of the groups of the fault current limiters according to the number of the bus tie switches in combination with the bus segmentation condition specifically means that if the bus tie switches are double-bus connection, only one bus tie switch is arranged between two buses, and only one group of fault current limiters needs to be installed; if the bus is a double bus section, 4 bus sections are actually provided, and at least 2 bus tie switches are required to be provided with fault current limiters.
Further, in step 2, if the branch with the larger branch short-circuit current is a line and the branch short-circuit current of a single line is significantly higher than that of other branches, a fault current limiter is configured on the branch; if the branch short-circuit currents of the plurality of branches are all large, fault current limiters are arranged on part or all of the plurality of branches.
The invention has the beneficial effects that:
according to the technical scheme, the calculation result of the branch short-circuit current of the bus, the in-station wiring of the transformer substation and the outgoing line condition of the transformer substation are comprehensively analyzed, the branch with large branch short-circuit current is selected to configure the fault current limiter, and the influence of the in-substation bus mode and the combined configuration mode of the plurality of branch fault current limiters on the short-circuit current limiting effect is considered, so that the short-circuit current level of the transformer substation can be reduced to the maximum extent by accessing the fault current limiter, and the safe and stable operation of a power system is guaranteed. Compared with the existing scheme for reducing the short-circuit current, the method comprehensively utilizes various factors influencing the short-circuit current in the power grid, and has the advantages of clear thought, easiness in implementation, strong practicability and the like.
Drawings
Fig. 1 fault current limiter basic structure;
FIG. 2 illustrates an embodiment of a method of reducing short-circuit current in a substation using a fault current limiter;
FIG. 3 shows an access mode 1 of outgoing lines of a transformer substation on a bus;
fig. 4 shows a bus access mode 2 of the outgoing line of the substation.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, the basic structure of the fault current limiter is characterized in that a high-speed switch is connected in parallel with a current-limiting reactor, when the switch is closed during normal operation, the current-limiting reactor has no influence on a system, when a short-circuit fault occurs, a control protection system quickly detects the fault, and a quick mechanical switch is opened in about 5-10 ms, so that a series reactance is put into a line to limit a short-circuit current.
As shown in fig. 2, an embodiment of a method for reducing a short-circuit current of a substation by using a fault current limiter of the present invention includes the following steps:
s1: and calculating the short-circuit current of the bus branch and sequencing the result aiming at the bus with the standard-exceeding short-circuit current.
S2: selecting a branch with large branch short-circuit current to configure a fault current limiter; wherein:
if the branch with larger branch short-circuit current is a main transformer, configuring a fault current limiter on a main transformer high/medium voltage side or a bus-coupled switch; if the branch with larger branch short-circuit current is a line, a fault current limiter is configured on the line.
S3: and calculating the influence of the denominator modes in different substations and the combined configuration modes of different branch fault current limiters on the short-circuit current limiting effect, and selecting the configuration mode with the best short-circuit current limiting effect.
In a preferred embodiment, on the basis of the above, in step S2, if the branch with a larger branch short-circuit current is the main transformer, the fault current limiter is configured on the high/medium voltage side of the main transformer or the bus tie switch, and when the fault current limiter is configured on the bus tie switch, the number of sets of fault current limiters is determined according to the number of bus tie switches according to the bus tie segmentation condition; specifically, if the double-bus connection is adopted, only one bus-coupled switch is arranged between the two buses, and only one group of fault current limiters is required to be installed; if the bus is a double bus section, 4 bus sections are actually provided, and at least 2 bus tie switches are required to be provided with fault current limiters.
In another preferred embodiment, on the basis of the above, in step S2, if the branch with the larger branch short-circuit current is the line and the branch short-circuit current of a single line is significantly higher than that of other branches, a fault current limiter is configured on the branch; if the branch short-circuit currents of the plurality of branches are all large, fault current limiters are arranged on part or all of the plurality of branches.
According to the technical scheme, aiming at the condition that the short-circuit current of the power grid exceeds the standard, the calculation result of the branch short-circuit current of the bus, the in-station wiring of the transformer substation and the wire outlet condition of the transformer substation are comprehensively analyzed, the branch with large branch short-circuit current is selected to configure the fault current limiter, and meanwhile, the influence of the in-substation bus mode and the multi-branch fault current limiter combination configuration mode on the short-circuit current limiting effect is considered, so that the short-circuit current level of the transformer substation can be reduced to the maximum extent when the fault current limiter.
As shown in fig. 3 and 4, the outgoing lines of the substation are accessed to different buses in different access modes, wherein fig. 2 considers accessing different buses according to a station, and fig. 3 considers accessing different buses to a double line of the same station. Calculating branch short-circuit current aiming at the condition that the short-circuit current existing in the power grid exceeds the standard, respectively calculating the branch short-circuit current aiming at the two conditions of fig. 2 and fig. 3, sequencing the branch short-circuit current according to the sequence from large to small, and then performing analysis according to the two conditions:
1. if the branch with larger branch short-circuit current is a main transformer, a fault current limiter needs to be configured on the high/medium voltage side of the main transformer or a bus-coupled switch. When the bus tie switch is configured with the fault current limiter, the number of the bus tie switches needs to be considered, if the bus tie switch is a double-bus connection, only one bus tie switch is arranged between two buses, and only one group of fault current limiters needs to be arranged; if the bus is a double bus section, 4 bus sections are actually provided, at least 2 bus tie switches are required to be provided with the fault current limiter, and the short-circuit current limiting effect of the fault current limiter under two different line access modes of fig. 2 and fig. 3 is compared. Meanwhile, in consideration of the conditions of extension of a main transformer and the like in the future, a bus-tie fault current limiter configuration scheme is preferred.
2. If the branch with larger branch short-circuit current is a line and the branch short-circuit current of a single line is obviously higher than that of other branches, a fault current limiter is considered to be configured on the branch; if the branch short-circuit currents of the multiple branches are all large, the fault current limiters are configured on the multiple branches, the short-circuit current limiting effects under different combination modes are compared, and the optimal fault current limiter configuration scheme is finally determined.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (4)
1. A method of reducing short circuit current in a substation using a fault current limiter, comprising:
step 1: calculating the short-circuit current of the bus branch and sequencing the result aiming at the bus with the standard-exceeding short-circuit current;
step 2: selecting a branch with large branch short-circuit current to configure a fault current limiter; wherein:
if the branch with larger branch short-circuit current is a main transformer, configuring a fault current limiter on a main transformer high/medium voltage side or a bus-coupled switch; if the branch with larger branch short-circuit current is a line, configuring a fault current limiter on the line;
and step 3: and calculating the influence of the denominator modes in different substations and the combined configuration modes of different branch fault current limiters on the short-circuit current limiting effect, and selecting the configuration mode with the best short-circuit current limiting effect.
2. The method for reducing the short-circuit current of the substation by using the fault current limiter as claimed in claim 1, wherein the method comprises the following steps: in the step 2, if the branch with the larger branch short-circuit current is the main transformer, when the bus tie switch is configured with the fault current limiter, the number of groups of the fault current limiter is determined according to the number of the bus tie switches by combining the bus segmentation condition.
3. A method for reducing short-circuit current of a substation by using a fault current limiter according to claim 2, characterized in that: in step 2, the step of determining the number of groups of fault current limiters according to the number of bus tie switches in combination with the bus segmentation condition specifically means that if the bus connection is a double-bus connection, only one bus tie switch is arranged between two buses, and only one group of fault current limiters needs to be installed; if the bus is a double bus section, 4 bus sections are actually provided, and at least 2 bus tie switches are required to be provided with fault current limiters.
4. The method for reducing the short-circuit current of the substation by using the fault current limiter as claimed in claim 1, wherein the method comprises the following steps: in the step 2, if the branch with larger branch short-circuit current is a line and the branch short-circuit current of a single line is obviously higher than that of other branches, configuring a fault current limiter on the branch; if the branch short-circuit currents of the plurality of branches are all large, fault current limiters are arranged on part or all of the plurality of branches.
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| CN109687417A (en) * | 2019-01-28 | 2019-04-26 | 国电南瑞科技股份有限公司 | A kind of fault current limiter configuration method |
| CN110224385A (en) * | 2019-06-21 | 2019-09-10 | 武汉大学 | The Optimal Configuration Method of superconductive failure current limiter in a kind of active distribution network |
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2019
- 2019-12-18 CN CN201911305468.0A patent/CN112260243B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148497A (en) * | 2011-04-25 | 2011-08-10 | 东南大学 | Optimal configuration method of series reactor for limiting short-circuit current |
| CN102255297A (en) * | 2011-06-08 | 2011-11-23 | 广东电网公司电力科学研究院 | Short-circuit current limiter additionally-arranging method and device |
| CN103199551A (en) * | 2013-03-13 | 2013-07-10 | 南方电网科学研究院有限责任公司 | Stationing and parameter optimization method of syntony-type fault current limiter |
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