CN110176754A - From bypass type fault current limiter and its control method - Google Patents
From bypass type fault current limiter and its control method Download PDFInfo
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- CN110176754A CN110176754A CN201910382384.0A CN201910382384A CN110176754A CN 110176754 A CN110176754 A CN 110176754A CN 201910382384 A CN201910382384 A CN 201910382384A CN 110176754 A CN110176754 A CN 110176754A
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- current
- branch
- fault current
- current limiter
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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
Abstract
The present invention provides one kind from bypass type fault current limiter and its control method, includes through-flow branch, electric current transfer branch current limliting branch from bypass type fault current limiter, using wholly-controled device, logic is simple, and controllability is strong；It includes a kind of completely new single clamper submodule that the type current limiter electric current, which shifts branch, has single quadrant service ability of two-way bypass and one-way clamp.The current limiter action process does not depend on the protective effect of arrester, effectively increases the current limiter service life.Control method provided by the invention from bypass type fault current limiter is divided into before the failure that the DC line where the DC line where current limiter operates normally or detect current limiter occurs and detects that the failure latter two situation occurred from the DC line where bypass type fault current limiter is controlled to realizing from bypass type fault current limiter.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of from bypass type fault current limiter and its controlling party
Method.
Background technique
D.C. high voltage transmission (high voltage direct current, HVDC) due to its technology and economically only
Special advantage is widely applied in China's long-distance and large-capacity power transmission and interconnection of large-scale power grids.D.C. high voltage transmission not only has
Many characteristics such as the stabilization of power grids, reliable, while also providing convenience for the extensive access of distributed energy.But due to cannot be
Good counter-measure is taken when the system failure, limits the development of DC grid.Wherein technical difficult points are that high pressure is big
The direct current limiter technology of capacity is still immature.Therefore, studying one kind, DC current can be limited in DC system fault fast
Speed rises, and mitigates the device of equipment pressure at different levels in direct current system, has become the hot spot studied both at home and abroad.
From the point of view of nearly development in 20 years, direct current limiter can be divided into two major classes, the mainly direct current current-limiting of superconduction type
Device and direct current limiter based on power electronics.Since the direct current limiter cost of superconduction type is high, when quite long
It is interior not have large-scale application potentiality also.And in recent years due to universal, the direct current based on power electronics of power electronic devices
Current limiter is widely studied and promotes, and is concentrated mainly on solid-state direct-current current limiter and hybrid direct current limiter.Solid-state direct-current limit
It flows device to power by IGBT to electricity consumption end when network system is operated normally, however the on-state tube voltage drop of IGBT is larger, causes solid
The loss of state direct current limiter is big, less economical.Hybrid direct current limiter operates normally electricity using Fast mechanical switch conducting
Stream, electronic power switch disjunction fault current reduce on-state loss under the premise of guaranteeing breaking capacity and movement speed, have
Good research and application prospect.The disadvantage is that cut-off current depends on number of devices in power electronics branch, a large amount of electricity is needed
Power electronic device, to cause high voltage direct current current limiter to involve great expense and take up a large area.
Summary of the invention
In order to overcome the loss of the above-mentioned current limiter of solid-state direct-current in the prior art big and less economical and hybrid direct current
Current limiter involves great expense and takes up a large area deficiency, the present invention provide it is a kind of from bypass type fault current limiter and its control method,
It include through-flow branch, electric current transfer branch and current limliting branch from bypass type fault current limiter.Through-flow branch, in DC line
The conducting of DC line steady-state current is realized when normal operation, and by fault current after detecting the failure that DC line occurs
It is transferred to electric current transfer branch, electric current shifts branch, for carrying the fault current of through-flow branch transfer, and makes in current limliting branch
Current limiting element access DC line；It is divided into from the DC line where bypass type fault current limiter and operates normally or detect certainly
Before the failure that DC line where bypass type fault current limiter occurs and detect from where bypass type fault current limiter
The failure latter two situation that DC line occurs realizes control to from bypass type fault current limiter, adopts from bypass type fault current limiter
With wholly-controled device, logic is simple, and control ability is strong.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, the present invention provides a kind of from bypass type fault current limiter, comprising:
Through-flow branch for realizing the conducting of DC line steady-state current when DC line operates normally, and is detecting
Fault current is transferred to electric current transfer branch after the failure occurred to DC line；
Electric current shifts branch, for carrying the fault current of through-flow branch transfer, and makes the current-limiting inductance in current limliting branch
Access DC line；
Current limliting branch, for increasing system damping, fault current limiting increases.
The through-flow branch include quick isolation switch K1 and with the concatenated conversion module of quick isolation switch；
The conversion module includes N number of IGBT unit, and N number of IGBT unit is with series, parallel or series-parallel combination group
It closes；
The IGBT unit include IGBT and with the antiparallel diode of IGBT.
The through-flow branch and electric current shift branch circuit parallel connection, form common point A and common point B；
The routing of electric current transfer branch can clamper submodule form in series and parallel.
It is described can clamper submodule be made of IGBT and anti-paralleled diode and capacitor.
It is described can the characteristic of clamper submodule can indicate are as follows: in IGBT conducting, capacitor can be in clamper submodule
Bypass condition, can be with circulating current；After IGBT locking, it is equivalent to the capacitor being connected in series through diode rectifier bridge.
The current limliting branch and through-flow branch and electric current shift branch circuit parallel connection, and tie point is similarly common point A and common point
B；
The current limliting branch can be made of resistive element or reactance component with series-parallel system；
On the other hand, it operates normally or is detected from bypass type failure from the DC line where bypass type fault current limiter
Before the failure that DC line where current limiter occurs, the present invention provides a kind of controlling parties from bypass type fault current limiter
Method, comprising:
Electric current shifts all IGBT conducting in branch, and steady-state current or fault current flow through through-flow branch.
In another aspect, detecting from after the failure that the DC line where bypass type fault current limiter occurs, the present invention is also
Another control method from bypass type fault current limiter is provided, comprising:
All IGBT shutdown in through-flow branch, and all IGBT conductings in electric current transfer branch, fault current flow through electricity
Circulation moves IGBT in branch；
It is latched whole submodule IGBT in main branch.The capacitor in main branch is serially connected at this time, is convenient for quick charge.Limit
Reactor is flowed at this time with capacitor at parallel relationship, and the raising of capacitance voltage can be such that fault current shifts to reactor；
Fault current is all shifted to current-limiting reactor L, and system enters the discharge process of RLC series circuit；
IGBT2 in conducting submodule while turning off main circuit breaker IGBT.Due to fault current rapid decrease, current-limiting reactor
On polarity of voltage becoming it is left negative right just current-limiting reactor passes through IGBT2 and diode continuousing flow, and the energy in system reactance passes through
Arrester energy consumption；
DC line electric current falls to 0, is latched IGBT2.The reciprocal capacitance parallel branch in main branch is serially connected at this time,
Capacitor charging of the current limiter reactive current into single clamper submodule, and consume energy by resistance.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
It is provided by the invention from bypass type fault current limiter include through-flow branch, electric current transfer branch and current limliting branch and,
Through-flow branch for realizing the conducting of DC line steady-state current when DC line operates normally, and is detecting AC line
Fault current is transferred to electric current transfer branch after the failure that road occurs, electric current shifts branch, for carrying through-flow branch transfer
Fault current, and current limiting element in current limliting branch is made to access DC line；
Control method provided by the invention from bypass type fault current limiter is divided into from where bypass type fault current limiter
DC line is operated normally or is detected from before the failure that the DC line where bypass type fault current limiter occurs and detected
To the failure latter two situation occurred from the DC line where bypass type fault current limiter to real from bypass type fault current limiter
It now controls, control mode is simple, and controllability is strong；
In of the invention through-flow branch play conducting direct current route steady-state current, reduce DC line loss and save at
This effect, electric current transfer branch carry out that electric current transfer is forced to flow through current limliting branch after fault current appearance in time, inhibit event
Hinder electric current；
Technical solution provided by the invention takes full advantage of the stronger advantage of wholly-controled device control ability, by pincers
The flexible transfer of fault current is realized in the charging of capacitor in bit submodule；
Technical solution provided by the invention is being operated normally or is being detected from the DC line where bypass type fault current limiter
To from before the failure that the DC line where bypass type fault current limiter occurs, electric current flows through through-flow branch, and through-flow branch has
Lesser loss resistance, better economy when stable state；
Technical solution provided by the invention detects the failure occurred from the DC line where bypass type fault current limiter
Afterwards, along with the charging of commutation capacitor in electric current transfer branch, fault current can be forced to flow through electric current；
Technical solution provided by the invention effectively save can be invested using the half control type device of low cost.
Detailed description of the invention
Fig. 1 is in the embodiment of the present invention 1 from bypass type fault current limiter structure chart；
Fig. 2 is stable state and to detect the current path schematic diagram before failure in the embodiment of the present invention 2；
Fig. 3 is the circulation path signal of DC line fault electric current in S101 after detecting failure in the embodiment of the present invention 3
Figure；
Fig. 4 is the circulation path signal of DC line fault electric current in S102 after detecting failure in the embodiment of the present invention 3
Figure；
Fig. 5 is the circulation path signal of DC line fault electric current in S103 after detecting failure in the embodiment of the present invention 3
Figure；
Fig. 6 is the circulation path schematic diagram after detecting failure in the embodiment of the present invention 3 in S104 in fault current limiter；
Fig. 7 is the circulation path schematic diagram after detecting failure in the embodiment of the present invention 3 in S105 in fault current limiter.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The embodiment of the present invention 1 provides one kind from bypass type fault current limiter, specifically includes through-flow branch, electric current transfer branch
It is as follows with the function of current limliting branch, each branch:
Through-flow branch therein, for realizing the conducting of DC line steady-state current when DC line operates normally, and
Fault current is transferred to current limliting branch after detecting the failure that DC line occurs；
Electric current therein shifts branch, for carrying the fault current of through-flow branch transfer, and forces in current limliting branch
Current limiting element accesses DC line；
Current limliting branch therein reduces raising speed on fault current for increasing system damping after DC line of connecting
Degree.
Above-mentioned through-flow branch include quick isolation switch K1 and with the concatenated conversion module of quick isolation switch；Conversion module
Including 2 IGBT units, 2 IGBT units combine in a series arrangement.First IGBT unit includes IGBT1 and anti-with IGBT1
Diode D1 in parallel, second IGBT unit include IGBT2 and with the antiparallel diode D2 of IGBT2.
The embodiment of the present invention 1 provide from bypass type fault current limiter structural schematic diagram as shown in Figure 1, in Fig. 1, through-flow branch
Road, electric current transfer branch and current limliting branch circuit parallel connection, A, B indicate common point.
Electric current transfer branch routes single clamper submodule and is formed in series and parallel.
The feature being had based on clamper submodule that the embodiment of the present invention 1 provides are as follows: in submodule after IGBT locking,
It can be equivalent to through the concatenated capacitor of diode rectifier bridge institute, and all capacitors can be equivalent to an electricity in electric current transfer branch
Hold,.
Current limliting branch include current-limiting reactor or current-limiting resistance, or both the combination through any series-parallel system.
Embodiment 2
The embodiment of the present invention 2 provides a kind of control method from bypass type fault current limiter, and detailed process is as follows:
From the DC line normal operation where bypass type fault current limiter and before detecting failure, through-flow branch
In IGBT1 and IGBT2 conducting, electric current transfer branch in IGBT be latched, current limliting branch is out of service, in through-flow branch
IGBT1 and IGBT2 conducting, steady-state current or fault current flow through through-flow branch, and DC line is operated normally and detected from other
Before the failure that DC line where the type fault current limiter of road occurs, steady-state current or fault current flow through through-flow branch, detection
Before to failure DC line fault electric current to flow through path schematic diagram as shown in Figure 2.
Embodiment 3
The control method from bypass type fault current limiter that the embodiment of the present invention 3 provides, suitable for detecting from bypass type
After the failure that DC line where fault current limiter occurs, detailed process is as follows:
S101: all IGBT shutdown in through-flow branch, conducting electric current shift whole submodules, single clamper submodule in branch
All capacitors are in bypass condition in block, and the circulation path schematic diagram of fault current is as shown in Figure 3；
S102: whole submodule IGBT in locking main branch.The capacitor in main branch is serially connected at this time, convenient for quickly filling
Electricity.Current-limiting reactor is at this time with capacitor at parallel relationship, and the raising of capacitance voltage can be such that fault current shifts to reactor, failure
The circulation path schematic diagram of electric current is as shown in Figure 4；
S103: fault current is all shifted to current-limiting reactor L, and system enters the discharge process of RLC series circuit, failure electricity
The circulation path schematic diagram of stream is as shown in Figure 5；
S104: IGBT2 in conducting submodule while shutdown main circuit breaker IGBT.Due to fault current rapid decrease, limit
Polarity of voltage on galvanic electricity is anti-becoming it is left it is negative it is right just, current-limiting reactor passes through IGBT2 and diode continuousing flow, and the energy in system reactance
Amount consumes energy by arrester, and the circulation path schematic diagram of fault current is as shown in Figure 6.
S105: DC line electric current falls to 0, is latched IGBT2.Reciprocal capacitance parallel branch at this time in main branch is mutual
Series connection, current limiter reactive current consume energy to single clamper submodule capacitor charging, and by resistance, and the circulation path of fault current shows
It is intended to as shown in Figure 7.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (4)
1. a kind of from bypass type fault current limiter characterized by comprising
Through-flow branch, for realizing the conducting of DC line steady-state current when DC line operates normally, and it is straight detecting
Fault current is transferred to current limliting branch after the failure that Flow Line occurs；
Electric current shifts branch, for carrying the fault current of through-flow branch transfer, and accesses the current limiting element in current limliting branch
DC line；
Current limliting branch is made of resistive element or reactance component with series-parallel system.
2. according to claim 1 from bypass type fault current limiter, which is characterized in that the electric current transfer branch routes multiple groups
Completely new single clamper submodule composition.The clamper submodule combined in series and parallel by IGBT, thyristor, capacitor and energy consumption resistor and
At；It forces electric current to be transferred to current-limiting reactor by submodule capacitor charging, while utilizing energy storage in energy consumption resistor consumption current limiter
The energy of element creates conditions for investment current limiter next time.
3. a kind of control method from bypass type fault current limiter as described in claim 1-2 is any, which is characterized in that from side
DC line where the type fault current limiter of road is operated normally or is detected from the DC line where bypass type fault current limiter
Before the failure of generation, which comprises
All IGBT conducting in through-flow branch, steady-state current or fault current flow through through-flow branch.
4. a kind of control method from bypass type fault current limiter as described in claim 1-6 is any, which is characterized in that detection
To from after the failure that the DC line where bypass type fault current limiter occurs, which comprises
All IGBT shutdown in through-flow branch, and all IGBT conductings in electric current transfer branch, fault current flow through electric current and turn
Move IGBT in branch；
It is latched whole submodule IGBT in main branch.The capacitor in main branch is serially connected at this time, is convenient for quick charge.Current limliting electricity
For anti-device at this time with capacitor at parallel relationship, the raising of capacitance voltage can be such that fault current shifts to reactor；
Fault current is all shifted to current-limiting reactor L, and system enters the discharge process of RLC series circuit；
IGBT2 in conducting submodule while turning off main circuit breaker IGBT.Due to fault current rapid decrease, on current-limiting reactor
Polarity of voltage is becoming the left negative right side just, and current-limiting reactor passes through IGBT2 and diode continuousing flow, and the energy in system reactance is by lightning-arrest
Device energy consumption；
DC line electric current falls to 0, is latched IGBT2.The reciprocal capacitance parallel branch in main branch is serially connected at this time, current limliting
Capacitor charging of the device reactive current into single clamper submodule, and consume energy by resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910382384.0A CN110176754A (en) | 2019-05-09 | 2019-05-09 | From bypass type fault current limiter and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910382384.0A CN110176754A (en) | 2019-05-09 | 2019-05-09 | From bypass type fault current limiter and its control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970875A (en) * | 2019-10-17 | 2020-04-07 | 四川大学 | Combined current-limiting type direct current breaker for direct current power grid |
| CN116388132A (en) * | 2023-06-05 | 2023-07-04 | 广东电网有限责任公司广州供电局 | DC current limiter, DC circuit breaker, DC fault current limiting method and related equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970875A (en) * | 2019-10-17 | 2020-04-07 | 四川大学 | Combined current-limiting type direct current breaker for direct current power grid |
| CN116388132A (en) * | 2023-06-05 | 2023-07-04 | 广东电网有限责任公司广州供电局 | DC current limiter, DC circuit breaker, DC fault current limiting method and related equipment |
| CN116388132B (en) * | 2023-06-05 | 2023-08-08 | 广东电网有限责任公司广州供电局 | DC current limiter, DC circuit breaker, DC fault current limiting method and related equipment |
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Application publication date: 20190827 |