CN107623308A - A kind of suppressing method and system of AC network short circuit currents - Google Patents
A kind of suppressing method and system of AC network short circuit currents Download PDFInfo
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- CN107623308A CN107623308A CN201710720573.5A CN201710720573A CN107623308A CN 107623308 A CN107623308 A CN 107623308A CN 201710720573 A CN201710720573 A CN 201710720573A CN 107623308 A CN107623308 A CN 107623308A
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- short circuit
- electricity
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- transformer station
- current limliting
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Abstract
The embodiment of the present invention provides a kind of suppressing method and system of AC network short circuit currents, is related to technical field of power systems, it is intended to controls the short circuit current of transformer station in rational scope.The system includes：One transformer station for including at least three transmission lines of electricity, one end of every transmission line of electricity are connected by breaker with substation bus bar, and the other end connects other transformer stations；By the separating brake of breaker, either combined floodgate realizes that transmission line of electricity puts into operation or exited, and system also includes：Current limliting module, current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；Wherein：Current limliting module is used to limit the short circuit current on each subtransmission circuit of transformer station, to reach limitation transformer station totality short circuit current, and the purpose for assisting substation breakers to cut-off.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of suppressing method of AC network short circuit currents and
System.
Background technology
In operation, the electric current for occurring to flow through during improper connection between phase and phase or between phase and ground is usual for power system
Referred to as short circuit current.The short circuit current includes three short circuit current, line to line fault electric current and single-phase short circuit current, and its value can be remote
Much larger than rated current.In bulk power system, short circuit current is up to tens thousand of peaces.Short circuit current causes huge to grid equipment
Impact, may result in device damage.Further, since existing circuit breaker short circuit electric current rupturing capacity is limited, excessive short circuit electricity
Stream will exceed breaking capacity of breaker, and failure will be unable to cut off, and can cause tremendous influence to power system.
In order to which the short circuit current for solving the problems, such as above-mentioned is exceeded, grid disruption road device can be replaced by opening for more Large Copacity
Close, to meet to switch the requirement of rupturing capacity, AC network short circuit currents can also be suppressed by current-limiting apparatus so that this is short
Road electric current is maintained in rational scope.
It is the technology of current urgent need to resolve therefore it provides a kind of effective method for suppressing AC network short circuit currents
Problem.
The content of the invention
Embodiments of the invention provide a kind of suppressing method and system of AC network short circuit currents, it is intended to by alternating current
Short circuit current in net is controlled in rational scope.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The first aspect of the embodiment of the present invention, there is provided a kind of suppression system of AC network short circuit currents, the system
Including：One transformer station for including at least three transmission lines of electricity, one end of every outlet passes through breaker and substation bus bar phase
Even, the other end connects other transformer stations；By the separating brake of the breaker either combined floodgate realize the transmission line of electricity put into operation or
Exit, the system also includes：Current limliting module, the current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；
Wherein：
The current limliting module is used to limit the short circuit current on each subtransmission circuit of transformer station, to reach limitation transformer station
Overall short circuit current, and the purpose for assisting substation breakers to cut-off.
Preferably, the number of the current limliting module is multiple, the multiple current limliting module be connected in series with each other with other
In the transmission line of electricity of transformer station's connection.
It is further preferred that the current limliting module includes：High-speed switch and reactor, the high-speed switch and the reactance
Device is connected in parallel.
It is further preferred that the system also includes：Measurement and control unit, the measurement and control unit with it is quick in the limiting block
Switch connection, for controlling closure or the disconnection of the high-speed switch；
When the substation bus bar, the current limliting module to substation bus bar or the transmission line of electricity of current limliting module side occur
During short trouble, the short circuit current of all transmission lines of electricity flows to trouble point by transmission line of electricity, and the trouble point short circuit current is
Each subtransmission line current sum, wherein：
The measurement and control unit, for controlling the high-speed switch in the current limliting module on every transmission line of electricity to disconnect to limit this
Short circuit current on subtransmission circuit, to reach the purpose of the short circuit current of limitation transformer station.
Optionally, the measurement and control unit is additionally operable to：
When the short-circuit current value in the transformer station is less than first threshold, the measurement and control unit is used to control current limliting module
In high-speed switch closure or be failure to actuate；
When the short-circuit current value in the transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, institute
Measurement and control unit is stated to be used to control the high-speed switch in current limliting module to open；
Wherein, the Second Threshold is more than the first threshold.
The second aspect of the embodiment of the present invention, there is provided a kind of suppressing method of AC network short circuit currents, applied to
System described in one side, methods described include：
When the short-circuit current value in transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, observing and controlling list
High-speed switch in member control current limliting module disconnects；
Wherein, the Second Threshold is more than the first threshold.
Optionally, methods described also includes：
It is fast in measurement and control unit control current limliting module when the short-circuit current value in transformer station is less than or equal to first threshold
Speed switch closure is failure to actuate.
The suppression system and method for AC network short circuit currents provided in an embodiment of the present invention, the system include：One
The transformer station of at least three transmission lines of electricity is included, one end of every outlet is connected by breaker with substation bus bar, the other end
Connect other transformer stations；By the separating brake of breaker, either combined floodgate realizes that transmission line of electricity puts into operation or exited, and system also includes：Limit
Flow module, current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；Wherein：Current limliting module is used to limit transformer station
Short circuit current on each subtransmission circuit, to reach limitation transformer station totality short circuit current, and substation breakers are assisted to open
Disconnected purpose.
Compared to prior art, pass through increase current limliting module, such power transformation in the transmission line of electricity of transformer station in this programme
When occurring short-circuit in the transmission line of electricity stood, the size of short circuit current can be suppressed by the current limliting module, so that transformer station
Short circuit current be maintained in rational scope, avoid due to short circuit current it is excessive influence power system normal operation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of the suppression system of AC network short circuit currents provided in an embodiment of the present invention；
Fig. 2 is the knot of current limliting module in a kind of suppression system of AC network short circuit currents provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 3 is a kind of method flow diagram of the suppressing method of AC network short circuit currents provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of suppression system of AC network short circuit currents, and the system includes：One includes
The transformer station of at least three transmission lines of electricity, one end of every transmission line of electricity are connected by breaker with substation bus bar, the other end
Connect other transformer stations；By the separating brake of breaker, either combined floodgate realizes that transmission line of electricity puts into operation or exited, and system also includes：Limit
Flow module, current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；Wherein：
Current limliting module is used to limit the short circuit current on each subtransmission circuit of transformer station, overall to reach limitation transformer station
Short circuit current, and the purpose for assisting substation breakers to cut-off.
Preferably, the number of above-mentioned current limliting module can be it is multiple, multiple current limliting modules be connected in series with each other with its
In the transmission line of electricity of his transformer station's connection.
It is exemplary, the arbitrary disposition of current-limiting impedance can be realized by the above-mentioned multiple current limliting modules of series connection.It is the plurality of
Block coupled in series can realize the superposition of current-limiting impedance, so as to realize the Current limited Control of multiple depth.
Preferably, above-mentioned current limliting module includes：High-speed switch and reactor, high-speed switch and reactor are connected in parallel.
Exemplary, above-mentioned current limliting module is to be composed in parallel by high-speed switch and current-limiting reactor.Pass through high-speed switch
Opening either closure is realized the input of current-limiting reactor or exited.
Exemplary, above-mentioned high-speed switch must have enough response speeds, 15ms be generally should be smaller than, to ensure
The limitation of short circuit current is realized before breaker disconnection.
Because the short circuit current of each branch path is smaller, once the network system method of operation determine would not occur it is big
Change.By choosing suitable current-limiting impedance, the voltage level can of current limliting module is controlled in relatively low level.Therefore, limit
The manufacture difficulty of flow module can substantially reduce, and existing ripe device can meets application requirement.
Preferably, above-mentioned system also includes：Measurement and control unit, measurement and control unit are connected with the high-speed switch in current limliting module；
When short trouble occurs for the transmission line of electricity of substation bus bar, current limliting module to substation bus bar or current limliting module side, own
The short circuit current of transmission line of electricity flows to trouble point by transmission line of electricity, and trouble point short circuit current is each subtransmission line current
Sum, wherein：
Measurement and control unit, for controlling the high-speed switch in the current limliting module on every transmission line of electricity to limit the subtransmission
Short circuit current on circuit, to reach the purpose of the short circuit current of limitation transformer station.
Above-mentioned trouble point short circuit current is each branch path electric current sum, by limiting the short circuit electricity in each branch path
Stream, has also just limited the short circuit current of transformer station.
It should be noted that short trouble, which occurs, for the transmission line of electricity of above-mentioned current limliting module side includes current limliting module and open circuit
Occur that short circuit occurs on the transmission line of electricity that short-circuit and current limliting module is connected with other transformer stations on the transmission line of electricity of device connection.
A kind of suppression system of AC network short circuit currents is provided below in conjunction with above-mentioned content, as shown in figure 1, should
System includes：One transformer station (part outlined in Fig. 1 with lines) for including eight transmission lines of electricity, the one of every transmission line of electricity
End passes through breaker (square frame with numeral in Fig. 1 is breaker, and 12 breakers are shared in the Fig. 1) and substation bus bar phase
Even, the other end connects other transformer stations (such as AC1 or AC2 etc.)；Transmission line of electricity is realized by the separating brake or combined floodgate of breaker
Put into operation or exit, the system also includes：Current limliting module, current limliting module are both provided with every circuit in eight transmission lines of electricity
It is connected in the transmission line of electricity being connected with other transformer stations.If other transformer stations here, by taking AC1 as an example, current limliting module is set
On the circuit that transmission line of electricity is connected with AC1.Wherein：
Current limliting module is used to limit the short circuit current on each subtransmission circuit of transformer station, overall to reach limitation transformer station
Short circuit current, and the purpose for assisting substation breakers to cut-off.
The schematic diagram of current limliting module provided in an embodiment of the present invention, reference picture 2 are illustrated in figure 2, the current limliting module includes
High-speed switch and current-limiting reactor, wherein：The high-speed switch and current-limiting reactor are connected in parallel, and the high-speed switch is also connected with observing and controlling
Unit, the measurement and control unit other end are also connected with current transformer, and the current transformer is used for the size for measuring electric current, will measure
Size of current be transferred in measurement and control unit, control signal is finally sent by measurement and control unit.
Optionally, above-mentioned measurement and control unit is additionally operable to：
When the short-circuit current value in transformer station is less than first threshold, measurement and control unit is quick in current limliting module for controlling
Switch closure is failure to actuate.
When the short-circuit current value in transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, observing and controlling list
Member is used to control the high-speed switch in current limliting module to disconnect.
Wherein, Second Threshold is more than first threshold.
It is exemplary, when above-mentioned short circuit current is between first threshold and Second Threshold, then illustrate in system there occurs
Short trouble, when above-mentioned short circuit current is less than first threshold, then illustrate system normal operation.
The suppression system of AC network short circuit currents provided in an embodiment of the present invention, the system include：One comprising extremely
The transformer station of few three transmission lines of electricity, one end of every outlet are connected by breaker with substation bus bar, and the other end connects it
His transformer station；By the separating brake of breaker, either combined floodgate realizes that transmission line of electricity puts into operation or exited, and system also includes：Current limliting mould
Block, current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；Wherein：Current limliting module is used to limit each point of transformer station
Short circuit current on branch transmission line of electricity, to reach limitation transformer station totality short circuit current, and assist what substation breakers were cut-off
Purpose.
Compared to prior art, pass through increase current limliting module, such power transformation in the transmission line of electricity of transformer station in this programme
When occurring short-circuit in the transmission line of electricity stood, the size of short circuit current can be suppressed by the current limliting module, so that transformer station
Short circuit current be maintained in rational scope, avoid due to short circuit current it is excessive influence power system normal operation.
Compared to prior art, by installing current-limiting apparatus in each outlet in power network in this programme, and pass through measurement
And whether logic control current limliting module puts into, so that the voltage level of current-limiting apparatus substantially reduces, greatly reduces equipment
Manufacture difficulty.
The current limiting system of this programme, it can arbitrarily control current limliting depth by way of building blocks accumulation.The core of this programme
Point is the responsiveness of fast vacuum switch, by sufficiently fast input current limliting module, ensures that the input of current limliting module is necessary
Before main switch disconnection.Using the current limiting technique of this programme, it may be such that AC network short circuit currents are maintained at rational model
In enclosing, avoid influences the normal operation of power system because short circuit current is excessive.
The embodiment of the present invention provides a kind of suppressing method of AC network short circuit currents, and this method is applied to above-mentioned
System, as shown in figure 3, this method includes：
101st, the short-circuit current value in transformer station is obtained.
Exemplary, above-mentioned step 101 can be the short-circuit current value of the transformer station sent by receiving measuring unit
To obtain the short circuit current.
102nd, when the short-circuit current value in transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, survey
The high-speed switch controlled in unit control current limliting module disconnects.
Wherein, above-mentioned Second Threshold is more than first threshold.
Optionally, above-mentioned method also includes：
It is fast in measurement and control unit control current limliting module when the short-circuit current value in transformer station is less than or equal to first threshold
Speed switch closure is failure to actuate.
Compared to prior art, pass through increase current limliting module, such power transformation in the transmission line of electricity of transformer station in this programme
When occurring short-circuit in the transmission line of electricity stood, the size of short circuit current can be suppressed by the current limliting module, so that transformer station
Short circuit current be maintained in rational scope, avoid due to short circuit current it is excessive influence power system normal operation.
Through the above description of the embodiments, it is apparent to those skilled in the art that, for description
It is convenient and succinct, can as needed will be upper only with the division progress of above-mentioned each functional module for example, in practical application
State function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete
All or part of function described above.The specific work process of the system, apparatus, and unit of foregoing description, before may be referred to
The corresponding process in embodiment of the method is stated, will not be repeated here.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (7)
1. a kind of suppression system of AC network short circuit currents, it is characterised in that the system includes：One includes at least three
The transformer station of bar transmission line of electricity, one end of every transmission line of electricity are connected by breaker with substation bus bar, and the other end connects it
His transformer station；By the separating brake of the breaker, either combined floodgate realizes that the transmission line of electricity puts into operation or exited, and the system is also
Including：Current limliting module, the current limliting block coupled in series is in the transmission line of electricity being connected with other transformer stations；Wherein：
The current limliting module is used to limit the short circuit current on each subtransmission circuit of transformer station, overall to reach limitation transformer station
Short circuit current, and the purpose for assisting substation breakers to cut-off.
2. system according to claim 1, it is characterised in that the number of the current limliting module is multiple, the multiple limit
Flow module is connected in series with each other in the transmission line of electricity being connected with other transformer stations.
3. system according to claim 1 or 2, it is characterised in that the current limliting module includes：High-speed switch and reactance
Device, the high-speed switch and the reactor are connected in parallel.
4. system according to claim 3, it is characterised in that the system also includes：Measurement and control unit, the measurement and control unit
It is connected with the high-speed switch in the current limliting module, for controlling closure or the disconnection of the high-speed switch；
When short circuit occurs for the substation bus bar, the current limliting module to substation bus bar or the transmission line of electricity of current limliting module side
During failure, the short circuit current of all transmission lines of electricity flows to trouble point by transmission line of electricity, and the trouble point short circuit current is each
Subtransmission line current sum, wherein：
The measurement and control unit, for controlling the high-speed switch in the current limliting module on every transmission line of electricity to disconnect to limit the branch
Short circuit current on transmission line of electricity, to reach the purpose of the short circuit current of limitation transformer station.
5. system according to claim 4, it is characterised in that the measurement and control unit is additionally operable to：
When the short-circuit current value in the transformer station is less than first threshold, the measurement and control unit is used to control in current limliting module
High-speed switch closes or is failure to actuate；
When the short-circuit current value in the transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, the survey
Control unit is used to control the high-speed switch in current limliting module to disconnect；
Wherein, the Second Threshold is more than the first threshold.
6. a kind of suppressing method of AC network short circuit currents, it is characterised in that applied to described in claim any one of 1-5
System, it is characterised in that methods described includes：
Obtain the short-circuit current value in transformer station；
When the short-circuit current value in the transformer station is more than or equal to first threshold and is less than or equal to Second Threshold, observing and controlling list
High-speed switch in member control current limliting module disconnects；
Wherein, the Second Threshold is more than the first threshold.
7. according to the method for claim 6, it is characterised in that methods described also includes：
When the short-circuit current value in transformer station is less than or equal to first threshold, quickly opening in measurement and control unit control current limliting module
Close and close or be failure to actuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710720573.5A CN107623308A (en) | 2017-08-21 | 2017-08-21 | A kind of suppressing method and system of AC network short circuit currents |
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| CN201710720573.5A CN107623308A (en) | 2017-08-21 | 2017-08-21 | A kind of suppressing method and system of AC network short circuit currents |
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| CN108469570A (en) * | 2018-02-05 | 2018-08-31 | 全球能源互联网研究院有限公司 | A kind of electric network fault processing method and system based on inverter |
| CN109921390A (en) * | 2019-02-02 | 2019-06-21 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on voltage characteristic |
| CN111130058A (en) * | 2020-01-17 | 2020-05-08 | 中国电力科学研究院有限公司 | Method and device for switching off large short-circuit current of power system by adopting grading operation |
| CN111181126A (en) * | 2020-01-17 | 2020-05-19 | 中国电力科学研究院有限公司 | Method and system for dynamically adjusting short-circuit current based on power transmission system topology |
| CN111934302A (en) * | 2020-07-31 | 2020-11-13 | 国网福建省电力有限公司电力科学研究院 | System and method for restraining single-phase fault short-circuit current applied to flexible direct-current power transmission system |
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| CN108469570A (en) * | 2018-02-05 | 2018-08-31 | 全球能源互联网研究院有限公司 | A kind of electric network fault processing method and system based on inverter |
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| CN109921390A (en) * | 2019-02-02 | 2019-06-21 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on voltage characteristic |
| CN111130058A (en) * | 2020-01-17 | 2020-05-08 | 中国电力科学研究院有限公司 | Method and device for switching off large short-circuit current of power system by adopting grading operation |
| CN111181126A (en) * | 2020-01-17 | 2020-05-19 | 中国电力科学研究院有限公司 | Method and system for dynamically adjusting short-circuit current based on power transmission system topology |
| CN111934302A (en) * | 2020-07-31 | 2020-11-13 | 国网福建省电力有限公司电力科学研究院 | System and method for restraining single-phase fault short-circuit current applied to flexible direct-current power transmission system |
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Application publication date: 20180123 |