CN111262227A - Method and device for regulating system topology to limit breaker on-off short-circuit current - Google Patents
Method and device for regulating system topology to limit breaker on-off short-circuit current Download PDFInfo
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- CN111262227A CN111262227A CN202010052649.3A CN202010052649A CN111262227A CN 111262227 A CN111262227 A CN 111262227A CN 202010052649 A CN202010052649 A CN 202010052649A CN 111262227 A CN111262227 A CN 111262227A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a method and a device for regulating a system topology to limit the on-off short-circuit current of a breaker, wherein the method comprises the steps of obtaining transformer substation system information, wherein the transformer substation system information comprises a wiring mode and a topology structure of a transformer substation system; determining a topological subset of the transformer substation system according to the transformer substation system information, and establishing a topological adjustment model; determining a topology adjustment control strategy according to the topology adjustment model and completing the on-off of the breaker when the fault occurs according to the topology adjustment control strategy; the invention can effectively reduce the short-circuit current when the fault occurs in the transformer substation, effectively cut off the breaker, and remove the fault in time, thereby avoiding the short-circuit current with higher amplitude from existing for a long time and damaging the equipment in the substation; the method makes up the defects of complex implementation and high cost of the existing method, and greatly increases the reliability, safety and flexibility of system operation.
Description
Technical Field
The invention relates to the field of power systems, in particular to a method and a device for regulating a system topology to limit the on-off short-circuit current of a breaker.
Background
With the continuous expansion of the scale of the power grid and the great improvement of the power transmission capacity of the main grid frame, the short-circuit current level of each link station is also sharply increased. The breaking capacity of the circuit breakers of partial plants and stations can obviously not meet the system requirements, and when the system has a short-circuit fault, the problem that the circuit breakers can not break short-circuit current can be faced. At the same time, the electrical equipment in the station must also carry greater thermal stresses and electrical forces, with a corresponding increase in the requirements for thermal and dynamic stability of the equipment. This problem seriously affects the safety and reliability of the power grid operation, and also becomes an important factor restricting the development of the power system.
The isolation of the breaker from the fault under the condition of large short-circuit current is a solution by improving the rated breaking current level of the breaker of the transformer substation, but the method needs to transform the breaker in the transformer substation, the implementation cost is high, the engineering quantity is large, and the technical level of the existing breaker can not meet all requirements.
At present, domestic and foreign power systems mainly limit short-circuit current from three aspects of power grid structures, operation modes and current limiting equipment, for example: the system is divided into different layers, the bus operates in different sections, the neutral point is additionally provided with a small reactance, the current limiting device and the like, but the methods all have technical and economic problems.
Disclosure of Invention
In order to solve the problem that the existing method in the background technology cannot simply and low-cost solve the problem that a breaker cannot cut off the short-circuit current when a short-circuit fault occurs in a transformer substation system, the invention provides a method for regulating system topology to limit the cut-off short-circuit current of the breaker, which comprises the following steps:
acquiring transformer substation system information, wherein the transformer substation system information comprises a wiring mode and a topological structure of a transformer substation system;
determining a topological subset of the substation system according to the substation system information;
establishing a topology adjustment model according to the substation system information, the substation system topology subset and a preset model;
and determining a topology adjustment control strategy according to the topology adjustment model, and completing the on-off of the breaker when the fault occurs according to the topology adjustment control strategy.
Further, the determining the substation system topology subset comprises:
determining a basic topological unit of the substation system; the basic topology unit of the transformer substation system comprises an outgoing line and a main transformer branch;
determining a secondary topological unit of the substation system; the secondary topological unit of the substation system comprises two basic topological units which are directly connected through a single circuit breaker;
if the bus tie breaker exists in the transformer substation system, determining a three-level topological unit of the transformer substation system; the three-level topological unit of the transformer substation system comprises a wiring string group connected with two sections of buses connected with a bus tie breaker.
Further, the establishing the topology adjustment model includes:
obtaining the breaking current I of the transformer substation system circuit breakerCB；
Calculating the maximum short-circuit current level I after the N basic topological units are directly connected with the two circuit breakers of the transformer substation system after being disconnectedF1m(m ═ 1,2,. N), N being the total number of basic topological units and N being a positive integer;
if present, IF1m＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF1m＜ICBThe circuit breaker disconnection operation of the basic topological unit has influence on system power flow, stability, overvoltage and the like; and selecting the basic topology unit with the minimum influence as an isolation topology unit adopted by the topology adjustment of the transformer substation system.
Further, the establishing the topology adjustment model further includes:
if there is no IF1m＜ICBOr in the presence of IF1m＜ICBThe basic topology unit circuit breaker is relatively large in influences on system tide, stability, overvoltage and the like in a breaking operation;
calculating the number P of the secondary topological units and the number P of the transformer substation system straight linesMaximum short-circuit current level I after disconnection of two connected circuit breakersF2q(q ═ 1,2,. P), P is the total number of secondary topological units and P is a positive integer;
if present, IF2q＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF2q＜ICBThe circuit breaker disconnection operation of the secondary topological unit has influence on system tide, stability, overvoltage and the like; and selecting the secondary topology unit with the smallest influence as an isolation topology unit adopted by the topology adjustment of the transformer substation system.
Further, the establishing the topology adjustment model further includes:
if there is no IF2q＜ICBOr in the presence of IF2q＜ICBThe secondary topological unit circuit breaker breaking operation has large influence on system tide, stability, overvoltage and the like;
calculating the maximum short-circuit current level I after the R three-level topological units are directly connected with the two circuit breakers of the transformer substation system and are disconnectedF3t(t ═ 1, 2.. R), where R is the total number of tertiary topological units and R is a positive integer;
if present, IF3t＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF3t＜ICBThe breaker disconnection operation of the three-level topological unit has influences on system tide, stability, overvoltage and the like; and selecting the three-level topological unit with the smallest influence as an isolation topological unit adopted by the topological adjustment of the transformer substation system.
Further, the determining the topology adjustment control strategy and completing the opening and closing of the circuit breaker when the fault is detected according to the topology adjustment control strategy includes:
when a fault occurs, the two circuit breakers connected with the other parts of the system and the isolation topology unit are disconnected;
and after the fault is removed, the isolated topological unit is accessed into the system again.
The device for adjusting the topology of the system to limit the open short-circuit current of the breaker comprises:
determining a topology subset unit, wherein one end of the topology subset unit is connected with a unit for establishing a topology adjustment model; the topology subset determining unit is used for acquiring substation system information, determining a substation system topology subset, and sending the substation system information and the substation system topology subset to the topology adjustment model establishing unit; the transformer substation system information comprises a wiring mode and a topological structure of the transformer substation system and breaker breaking current;
a topology adjustment model unit is established, and one end of the topology adjustment model unit is connected with a breaker on-off unit; the topology adjustment model establishing unit is used for establishing a topology adjustment model according to the substation system information, the substation system topology subset and a preset model; sending the topology adjustment model to the breaker on-off unit;
and the breaker switching-on and switching-off unit is used for determining a topology adjustment control strategy according to the topology adjustment model and switching on and switching off the breaker when a fault is completed.
Further, the determining the topology subset unit includes:
an information acquisition module, wherein one end of the information acquisition module is connected with the topology adjustment model building unit, and the other end of the information acquisition module is connected with a topology subset defining module; the information acquisition module is used for acquiring the transformer substation system information and sending the transformer substation system information to the topology adjustment model building unit and the topology subset defining module;
a topology subset defining module, wherein one end of the topology subset defining module is connected with the topology adjustment model establishing unit; the topology subset defining module is used for determining the substation system topology subset according to the substation system information and sending the substation system topology subset to the topology adjustment model establishing unit.
Further, the substation system topology subset includes:
a base topology unit; the basic topology unit comprises an outgoing line and a main transformer branch;
a secondary topology unit; the secondary topology unit comprises two basic topology units which are directly connected through a single circuit breaker;
if the bus tie breaker exists in the transformer substation system, a three-level topological unit exists; the three-stage topological unit comprises a wiring string group connected with two sections of buses connected with the bus tie breaker.
The invention has the beneficial effects that: the technical scheme of the invention provides a method and a device for regulating system topology to limit the on-off short-circuit current of a breaker, wherein the method comprises the steps of obtaining transformer substation system information, determining a transformer substation system topology subset and establishing a topology regulation model; determining a topology adjustment control strategy according to the topology adjustment model and completing the on-off of the breaker when the fault occurs according to the topology adjustment control strategy; the invention can effectively reduce the short-circuit current when the fault occurs in the transformer substation, effectively cut off the breaker, and remove the fault in time, thereby avoiding the short-circuit current with higher amplitude from existing for a long time and damaging the equipment in the substation; the method makes up the defects of complex implementation and high cost of the existing method, and greatly increases the reliability, safety and flexibility of system operation.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a method for adjusting a topology of a system to limit an open/close short circuit current of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the wiring manner of the substation system 3/2;
FIG. 3 is a schematic diagram of a breaker of a substation system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for regulating a topology of a system to limit an open/close short-circuit current of a circuit breaker according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for adjusting a system topology to limit a circuit breaker open/short circuit current according to an embodiment of the present invention. Fig. 2 is a schematic diagram of the wiring manner of the substation system 3/2. Fig. 3 is a schematic diagram of the breaker of the substation system according to the embodiment of the present invention. As shown in fig. 1,2 and 3, the method includes:
Specifically, in this example, three-half of the wiring of the substation is taken as an example, and n complete 3/2 wiring strings of the substation are assumed; wherein the ith wiring string is close to the bus M1Is marked as Ci1The outgoing line controlled by the circuit breaker is marked as Li1(ii) a Close to the bus M2Is marked as Ci3The outgoing line controlled by the circuit breaker is marked as Li2The interrupt of the string is marked as Ci2(i-1, 2, … …, n), if there is a buscouple breaker, then named C in turnM11、CM121、CM21、CM22Thereby determining the operation mode and the topological structure of the system.
determining a basic topological unit of the substation system; the basic topology unit of the transformer substation system comprises an outgoing line and a main transformer branch; in the example, in the 3/2 wiring mode, each basic topology unit and the rest parts of the system are connected through two circuit breakers;
determining a secondary topological unit of the substation system; the secondary topological unit of the substation system comprises two basic topological units which are directly connected through a single circuit breaker; in this example, in the 3/2 wiring mode, two basic topology units in each wiring string form a two-level topology unit; each two-stage topological unit is connected with other parts of the system through two circuit breakers;
if the bus tie breaker exists in the transformer substation system, determining a three-level topological unit of the transformer substation system; the three-level topological unit of the transformer substation system comprises a wiring string group connected with two sections of buses connected with a bus tie breaker; in the example, each three-level topological unit is connected with other parts of the system through two bus tie breakers; if there is no bust breaker or the like, there is no three-level topology unit.
if there is no IF1m＜ICBThen go to step 140;
if present, IF1m＜ICBSpecifically, in the present example, in the 3/2 wiring mode, there are 3n groups of short-circuit current levels corresponding to different basic topology units, and all the levels meeting I are calculated in the normal operation mode of the substation system and the fault condition of the substation system respectivelyF1m＜ICBThe circuit breaker disconnection operation of the basic topological unit has influence on system power flow, stability, overvoltage and the like; selecting the basic topology unit with the smallest influence as the isolation topology unit adopted by the topology adjustment of the transformer substation systemA row step 160; if the effects are all larger, proceed to step 140.
if there is no IF2q＜ICBThen go to step 150;
if present, IF2q＜ICBSpecifically, in the present example, in the 3/2 wiring mode, n groups of short-circuit current levels are total for different secondary topology units, and all the levels meeting I are calculated in the normal operation mode of the substation system and the fault condition of the substation system respectivelyF2q＜ICBThe circuit breaker disconnection operation of the secondary topological unit has influence on system tide, stability, overvoltage and the like; selecting the secondary topology unit with the smallest influence as an isolation topology unit adopted by the topology adjustment of the transformer substation system, and performing step 160; if the effects are all larger, proceed to step 150.
if there is no IF3t＜ICBThe method of the invention cannot be adopted to limit the short-circuit current;
if present, IF3t＜ICBSpecifically, in the present example, in the 3/2 wiring mode, 2 groups of short-circuit current levels are total for different three-level topology units, and all the levels meeting I are calculated in the normal operation mode of the substation system and the fault condition of the substation system respectivelyF3t＜ICBThe breaker disconnection operation of the three-level topological unit has influences on system tide, stability, overvoltage and the like; selecting a three-level topological unit with the smallest influence as an isolation topology adopted by the topological adjustment of the transformer substation systemA unit performing step 160; if the influences are large, the method cannot be adopted to limit the short-circuit current.
specifically, in this example, the basic topology unit of the L5 branch is finally selected as the isolated topology unit through calculation.
when a fault occurs, after the fault is quickly detected, the selected isolation topology unit is disconnected with two circuit breakers connected with other parts of the system, and the short-circuit current after the fault is reduced; then the relay protection device normally acts to remove the fault;
after the fault is removed, the isolated topological unit is accessed into the system again;
specifically, in the example, the short-circuit current level of the transformer substation is 65kA, and exceeds the breaking current level of the circuit breaker by 63kA, and a suppression measure needs to be adopted; selecting a basic topology unit of an L5 branch as an isolation topology unit through a dynamic topology adjustment scheme; when a bus short-circuit fault occurs in the system, the circuit breakers on the two sides of the L5 branch circuit are disconnected, the current of the circuit breakers is reduced, and then the rest circuit breakers of the bus are disconnected to realize the disconnection of the fault; the effect after application of the measures is shown in table 1.
TABLE 1 Current limiting Effect after application of measures
Fig. 4 is a schematic structural diagram of a device for regulating a topology of a system to limit an open/close short-circuit current of a circuit breaker according to an embodiment of the present invention. As shown in fig. 4, the apparatus includes:
a topology subset determining unit 210, wherein one end of the topology subset determining unit 210 is connected to the topology adjustment model establishing unit 220; the topology subset determining unit 210 is configured to obtain substation system information, determine a substation system topology subset, and send the substation system information and the substation system topology subset to the topology adjustment model establishing unit 220; the transformer substation system information comprises a wiring mode and a topological structure of the transformer substation system and breaker breaking current;
further, the determining the topology subset unit 210 includes:
an information obtaining module 2101, one end of the information obtaining module 2101 is connected to the topology adjustment model building unit 220, and the other end is connected to the topology subset defining module 2102; the information acquiring module 2101 is configured to acquire the substation system information and send the substation system information to the topology adjustment model building unit 220 and the topology subset defining module 2102;
a topology subset defining module 2102, wherein one end of the topology subset defining module 2102 is connected to the topology adjustment model building unit 220; the topology subset defining module 2102 is configured to determine the substation system topology subset according to the substation system information, and send the substation system topology subset to the topology adaptation model building unit 220.
Further, the substation system topology subset includes:
a base topology unit; the basic topology unit comprises an outgoing line and a main transformer branch;
a secondary topology unit; the secondary topology unit comprises two basic topology units which are directly connected through a single circuit breaker;
if the bus tie breaker exists in the transformer substation system, a three-level topological unit exists; the three-stage topological unit comprises a wiring string group connected with two sections of buses connected with the bus tie breaker.
A topology adjustment model establishing unit 220, wherein one end of the topology adjustment model establishing unit 220 is connected with a circuit breaker on-off unit 230; the topology adjustment model establishing unit 220 is configured to establish a topology adjustment model according to the substation system information, the substation system topology subset, and a preset model; and sends the topology adjustment model to the breaker opening/closing unit 230;
a breaker on-off unit 230, wherein the breaker on-off unit 230 is configured to determine a topology adjustment control strategy according to the topology adjustment model and complete the breaker on-off when a fault occurs;
specifically, in this example, the determining a topology adjustment control strategy and completing the opening and closing of the circuit breaker when the fault is detected according to the topology adjustment control strategy includes:
when a fault occurs, the two circuit breakers connected with the other parts of the system and the isolation topology unit are disconnected;
and after the fault is removed, the isolated topological unit is accessed into the system again.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (9)
1. A method for regulating a system topology to limit a circuit breaker from breaking short circuit current, the method comprising:
acquiring transformer substation system information, wherein the transformer substation system information comprises a wiring mode and a topological structure of a transformer substation system;
determining a topological subset of the substation system according to the substation system information;
establishing a topology adjustment model according to the substation system information, the substation system topology subset and a preset model;
and determining a topology adjustment control strategy according to the topology adjustment model, and completing the on-off of the breaker when the fault occurs according to the topology adjustment control strategy.
2. The method of claim 1, wherein the determining the substation system topology subset comprises:
determining a basic topological unit of the substation system; the basic topology unit of the transformer substation system comprises an outgoing line and a main transformer branch;
determining a secondary topological unit of the substation system; the secondary topological unit of the substation system comprises two basic topological units which are directly connected through a single circuit breaker;
if the bus tie breaker exists in the transformer substation system, determining a three-level topological unit of the transformer substation system; the three-level topological unit of the transformer substation system comprises a wiring string group connected with two sections of buses connected with a bus tie breaker.
3. The method of claim 2, wherein the establishing a topology adjustment model comprises:
obtaining the breaking current I of the transformer substation system circuit breakerCB；
Calculating the maximum short-circuit current level I after the N basic topological units are directly connected with the two circuit breakers of the transformer substation system after being disconnectedF1m(m＝1,N), N being the total number of said basic topological elements and N being a positive integer;
if present, IF1m＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF1m＜ICBThe circuit breaker disconnection operation of the basic topological unit has influence on system power flow, stability, overvoltage and the like; and selecting the basic topology unit with the minimum influence as an isolation topology unit adopted by the topology adjustment of the transformer substation system.
4. The method of claim 3, wherein the establishing a topology adjustment model further comprises:
if there is no IF1m＜ICBOr in the presence of IF1m＜ICBThe basic topology unit circuit breaker is relatively large in influences on system tide, stability, overvoltage and the like in a breaking operation;
calculating the maximum short-circuit current level I after the P two circuit breakers directly connected with the secondary topological unit and the transformer substation system are disconnectedF2q(q ═ 1,2,. P), P is the total number of secondary topological units and P is a positive integer;
if present, IF2q＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF2q＜ICBThe circuit breaker disconnection operation of the secondary topological unit has influence on system tide, stability, overvoltage and the like; and selecting the secondary topology unit with the smallest influence as an isolation topology unit adopted by the topology adjustment of the transformer substation system.
5. The method of claim 4, wherein the establishing a topology adjustment model further comprises:
if there is no IF2q＜ICBOr in the presence of IF2q＜ICBThe secondary topological unit circuit breaker breaking operation has large influence on system tide, stability, overvoltage and the like;
calculate RThe maximum short-circuit current level I of the three-level topological unit after the two circuit breakers directly connected with the transformer substation system are disconnectedF3t(t ═ 1, 2.. R), where R is the total number of tertiary topological units and R is a positive integer;
if present, IF3t＜ICBRespectively calculating all the I-compliant parameters in the normal operation mode of the transformer substation system and the fault condition of the transformer substation systemF3t＜ICBThe breaker disconnection operation of the three-level topological unit has influences on system tide, stability, overvoltage and the like; and selecting the three-level topological unit with the smallest influence as an isolation topological unit adopted by the topological adjustment of the transformer substation system.
6. The method of any one of claims 3, 4 or 5, wherein determining a topology regulatory control strategy and completing breaker opening upon failure according to the topology regulatory control strategy comprises:
when a fault occurs, the two circuit breakers connected with the other parts of the system and the isolation topology unit are disconnected;
and after the fault is removed, the isolated topological unit is accessed into the system again.
7. An apparatus for regulating a system topology to limit a circuit breaker's open short circuit current, the apparatus comprising:
determining a topology subset unit, wherein one end of the topology subset unit is connected with a unit for establishing a topology adjustment model; the topology subset determining unit is used for acquiring substation system information, determining a substation system topology subset, and sending the substation system information and the substation system topology subset to the topology adjustment model establishing unit; the transformer substation system information comprises a wiring mode and a topological structure of the transformer substation system and breaker breaking current;
a topology adjustment model unit is established, and one end of the topology adjustment model unit is connected with a breaker on-off unit; the topology adjustment model establishing unit is used for establishing a topology adjustment model according to the substation system information, the substation system topology subset and a preset model; sending the topology adjustment model to the breaker on-off unit;
and the breaker switching-on and switching-off unit is used for determining a topology adjustment control strategy according to the topology adjustment model and switching on and switching off the breaker when a fault is completed.
8. The apparatus of claim 7, wherein the determining the topology subset unit comprises:
an information acquisition module, wherein one end of the information acquisition module is connected with the topology adjustment model building unit, and the other end of the information acquisition module is connected with a topology subset defining module; the information acquisition module is used for acquiring the transformer substation system information and sending the transformer substation system information to the topology adjustment model building unit and the topology subset defining module;
a topology subset defining module, wherein one end of the topology subset defining module is connected with the topology adjustment model establishing unit; the topology subset defining module is used for determining the substation system topology subset according to the substation system information and sending the substation system topology subset to the topology adjustment model establishing unit.
9. The apparatus of claim 8, wherein the subset of substation system topology comprises:
a base topology unit; the basic topology unit comprises an outgoing line and a main transformer branch;
a secondary topology unit; the secondary topology unit comprises two basic topology units which are directly connected through a single circuit breaker;
if the bus tie breaker exists in the transformer substation system, a three-level topological unit exists; the three-stage topological unit comprises a wiring string group connected with two sections of buses connected with the bus tie breaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010052649.3A CN111262227A (en) | 2020-01-17 | 2020-01-17 | Method and device for regulating system topology to limit breaker on-off short-circuit current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111884190A (en) * | 2020-06-22 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Topology and insulation design method and device of current-limiting reactor |
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