CN112260244A - Direct current limiter based on quick switch and control method thereof - Google Patents
Direct current limiter based on quick switch and control method thereof Download PDFInfo
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- CN112260244A CN112260244A CN202010909176.4A CN202010909176A CN112260244A CN 112260244 A CN112260244 A CN 112260244A CN 202010909176 A CN202010909176 A CN 202010909176A CN 112260244 A CN112260244 A CN 112260244A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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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
- H02H7/268—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 dc systems
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct current limiter based on a quick switch and a control method thereof, wherein the direct current limiter comprises: the device comprises a plurality of mechanical switches, a plurality of controllable switch modules, a resistive device, a control module, a first switch and a second switch; the mechanical switches are sequentially connected in series; the controllable switch module is connected with one or more adjacent mechanical switches in parallel; two ends of the resistive device are respectively connected with the plurality of mechanical switches in parallel through the first switch and the second switch; the control module is respectively connected with the mechanical switch, the controllable switch module, the first switch and the second switch, and the adjustment of the current amplitude of the direct current limiter is achieved by controlling the on-off or off of the mechanical switch, the controllable switch module, the first switch and the second switch. Through connecting resistive device and a plurality of mechanical switch in parallel for when fault current surpassed the threshold value of setting for, resistive device inserts the electric line, reduces fault current amplitude, cooperates direct current circuit breaker to accomplish fast and cut off.
Description
Technical Field
The invention relates to the field of power equipment control, in particular to a direct current limiter based on a quick switch and a control method thereof.
Background
According to the current distribution situation of energy requirements in China, the construction of a direct-current power transmission system for realizing the optimal configuration of a power transmission structure becomes an important research direction, and particularly the problem of quick disconnection of direct-current fault current needs to be solved urgently.
Although dc breakers are effective devices for breaking fault currents, as transmission capacities continue to increase, the levels of fault currents increase and place greater demands on existing dc breakers in the system. Considering that the current limiter has the characteristics of a low-resistance state in normal and a high-resistance state in fault, if the current limiter is used for limiting the fault current, the direct-current circuit breaker can reliably complete the on-off task on the existing level. At present, related patents in the direct current field are mainly direct current superconducting current limiters, the current limiters utilize the characteristics of superconducting materials to complete the current limiting function, but after quench, the problems of long recovery time, heat generation, reduction of insulation level and overvoltage exist.
Disclosure of Invention
The embodiment of the invention aims to provide a direct current limiter based on a quick switch and a control method thereof.
To solve the above technical problem, a first aspect of an embodiment of the present invention provides a fast switching based dc current limiter, including: the device comprises a plurality of mechanical switches, a plurality of controllable switch modules, a resistive device, a control module, a first switch and a second switch;
the mechanical switches are sequentially connected in series, the number of the mechanical switches is n, and n is more than or equal to 1;
the controllable switch modules are connected with one or more adjacent mechanical switches in parallel, the number of the controllable switch modules is m, the number of the mechanical switches connected with the controllable switch modules in parallel is k, and n is more than or equal to k and more than or equal to m and more than or equal to 1;
two ends of the resistive device are connected with the plurality of mechanical switches in parallel through the first switch and the second switch respectively;
the control module is respectively connected with the mechanical switch, the controllable switch module, the first switch and the second switch, and the adjustment of the current amplitude of the direct current limiter is realized by controlling the on/off of the mechanical switch, the controllable switch module, the first switch and the second switch.
Further, the fast switching based dc current limiter further comprises:
a first capacitance connected in parallel with the resistive device.
Further, the mechanical switch is a vacuum switch or a high-speed isolating switch.
Further, the controllable switch module is a series and/or parallel combination of a controllable electronic component or a plurality of power diodes;
the controllable electronic component is a single, multiple or mixed electronic component with unidirectional or bidirectional current-carrying breaking capacity.
Further, the resistive device is a resistor, a ZnO arrester and/or an inductor.
Accordingly, a second aspect of the embodiments of the present invention provides a fast switching based dc current limiter control method, configured to control any one of the fast switching based dc current limiters described above, where the dc current limiter includes the following steps from a closing state to a current limiting state:
the control module receives a current-limiting operation instruction;
the control module sends a conducting signal to the controllable switch modules to enable the controllable switch modules to be in a pre-conducting state;
the control module controls a plurality of mechanical switches to start to execute opening operation;
when the arc voltage of the mechanical switch is greater than the conduction voltage drop of the controllable switch module connected in parallel with the mechanical switch, the controllable switch module is conducted, and the current flowing through the 1 st to the kth mechanical switches is transferred to the controllable switch module;
after a preset time, switching off the controllable switch module, switching off the arc of the (k + 1) th to nth mechanical switches, and transferring the current flowing through the controllable switch module and the (k + 1) th to nth mechanical switches to a resistive device to enable the direct current limiter to be in a current limiting state;
wherein, the closing state is: the 1 st to nth mechanical switches are switched on and off, the first switch and the second switch are switched on and off, and the controllable switch module is switched on and off.
Further, the step of switching the dc current limiter from the current limiting state to the closing state further includes the steps of:
the control module receives a current limiting releasing instruction, and closes the (k + 1) th to nth mechanical switches under the condition of ensuring that the 1 st to kth mechanical switches are closed, so that the direct current limiter is closed; or the like, or, alternatively,
when a closing instruction is not received but the direct current limiter works in a current limiting state for a preset time, under the condition that the 1 st to the kth mechanical switches are guaranteed to be closed, the (k + 1) th to the nth mechanical switches are closed, and the direct current limiter is closed.
Further, the step of switching the dc current limiter from the on state to the initial state further includes the following steps:
the control module receives an operation quitting instruction;
opening the (k + 1) th to nth mechanical switches;
opening the first switch and the second switch.
Further, the step of switching the dc current limiter from the initial state to the closed state further includes the following steps:
the control module receives a closing control instruction;
simultaneously turning on and off the first switch and the second switch;
and closing the (k + 1) th to the nth mechanical switches simultaneously to enable the direct current limiter to be switched on.
Further, the operation of closing the 1 st to kth mechanical switches may be completed in a process from a closing state to a current limiting state, and may be completed in a process from a current limiting state to a closing state.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
through connecting resistive device and a plurality of mechanical switch in parallel for when fault current surpassed the threshold value of setting for, resistive device inserts the electric line, reduces fault current amplitude, and the cooperation direct current circuit breaker accomplishes the cut-off fast, possesses advantages such as economic nature is good, the commonality is high and restriction fault current is fast.
Drawings
Fig. 1 is a schematic diagram of a dc current limiter based on fast switching according to an embodiment of the present invention;
fig. 2 is a first schematic diagram of a fast switching based dc current limiter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dc current limiter based on fast switching according to an embodiment of the present invention;
fig. 4 is a flowchart of a dc current limiter control method based on fast switching according to an embodiment of the present invention.
Reference numerals:
1. the circuit comprises a mechanical switch 2, a controllable switch module 3, a resistive device 4, a first capacitor 5, a first switch 6 and a second switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a dc current limiter based on fast switching according to an embodiment of the present invention.
Fig. 2 is a first schematic diagram of a fast switching based dc current limiter according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a dc current limiter based on fast switching according to an embodiment of the present invention.
Referring to fig. 1, fig. 2 and fig. 3, a first aspect of an embodiment of the present invention provides a fast switching based dc current limiter, including: the device comprises a plurality of mechanical switches 1, a plurality of controllable switch modules 2, a resistive device 3, a control module, a first switch 5 and a second switch 6; the mechanical switches 1 are sequentially connected in series, the number of the mechanical switches 1 is n, and n is more than or equal to 1; (ii) a The controllable switch modules 2 are connected with one or more adjacent mechanical switches 1 in parallel, the number of the controllable switch modules 2 is m, the number of the mechanical switches connected with the controllable switches in parallel is k, and n is more than or equal to k and more than or equal to m and more than or equal to 1; two ends of the resistive device 3 are respectively connected with the plurality of mechanical switches 1 in parallel through a first switch 5 and a second switch 6; the control module is respectively connected with the mechanical switch 1, the controllable switch module 2, the first switch 5 and the second switch 6, and the adjustment of the current amplitude of the direct current limiter is realized by controlling the on/off of the mechanical switch 1, the controllable switch module 2, the first switch 5 and the second switch 6.
According to the technical scheme, the resistive device 3 is connected with the mechanical switches 1 in parallel, so that when the fault current exceeds a set threshold value, the resistive device 3 is connected into the power transmission and distribution line, the fault current amplitude is reduced, the direct-current circuit breaker is matched to quickly complete the on-off, and the circuit breaker has the advantages of being good in economy, high in universality, high in fault current limiting speed and the like.
Specifically, the mechanical switches comprise 1 st to nth mechanical switches which are connected in series in a protected line of the power system; n is more than or equal to 1; the controllable switch modules comprise 1 st to m controllable switch modules, each controllable switch module can form a parallel connection relation with any single or adjacent mechanical switches, and k mechanical switches form a parallel connection relation with the controllable switch module; n is more than or equal to k, m is more than or equal to 1.
Optionally, the dc current limiter based on fast switch further includes: a first capacitor 4. A first capacitor 4 is connected in parallel with the resistive device 3.
Specifically, the mechanical switch 1 is a vacuum switch or a high-speed disconnector.
Furthermore, the controllable switch module is a series and/or parallel combination of a controllable electronic component or a plurality of power diodes; specifically, the controllable electronic component is a single, multiple or mixed electronic component with unidirectional or bidirectional current-carrying breaking capability, such as IGBT/IECT, GTO, and the like.
In a specific implementation of the embodiment of the present invention, the resistive device 3 is a resistor, a ZnO arrester and/or an inductor.
Fig. 4 is a flowchart of a dc current limiter control method based on fast switching according to an embodiment of the present invention.
Accordingly, referring to fig. 4, a second aspect of the embodiments of the present invention provides a fast switch-based dc current limiter control method, for controlling a fast switch-based dc current limiter, where the dc current limiter from a closing state to a current limiting state includes the following steps:
s210, the control module receives a current limiting operation instruction.
S220, the control module sends a conducting signal to the controllable switch modules 2, so that the controllable switch modules 2 are in a pre-conducting state.
And S230, the control module controls a plurality of mechanical switches 1 to start to execute opening operation.
S240, when the arc voltage of the mechanical switch 1 is greater than the turn-on voltage drop of the controllable switch module 2 connected in parallel, the controllable switch module 2 is turned on, and the current flowing through the 1 st to k th mechanical switches 1 is transferred to the controllable switch module 2.
And S250, after a preset time, switching on and switching off the controllable switch module 2, switching off the arc of the (k + 1) th to the (n) th mechanical switches 1, and transferring the current flowing through the controllable switch module 2 and the (k + 1) th to the n (n) th mechanical switches 1 to the resistive device 3 to enable the direct current limiter to be in a current limiting state.
Wherein, the closing state is: the 1 st to nth mechanical switches 1 are closed, the first switch 5 and the second switch 6 are closed, and the controllable switch module 2 is opened and closed.
Further, in the control method of the direct current limiter based on the fast switch, the step of switching the direct current limiter from the current limiting state to the closing state further comprises the following steps:
and S310, the control module receives a current limiting releasing instruction, and closes the (k + 1) th to nth mechanical switches 1 under the condition that the 1 st to kth mechanical switches 1 are ensured to be closed, so that the direct current limiter is closed.
Alternatively, the first and second electrodes may be,
and S320, when a closing instruction is not received but the direct current limiter works in a current limiting state for a preset time, under the condition that the 1 st to the kth mechanical switches 1 are ensured to be closed, closing the (k + 1) th to the nth mechanical switches 1 to close the direct current limiter.
Further, in the control method of the direct current limiter based on the fast switch, the step of enabling the direct current limiter to be in a closing state to an initial state further comprises the following steps:
s410, the control module receives an operation quitting instruction.
And S420, opening the k +1 th to the nth mechanical switches 1.
S430, the first switch 5 and the second switch 6 are turned off.
In addition, the operation of closing the 1 st to kth mechanical switches 1 may be performed in a process from a closing state to a current limiting state, and may be performed in a process from a current limiting state to a closing state.
Further, in the control method of the direct current limiter based on the fast switch, the step of switching the direct current limiter from the initial state to the closing state further comprises the following steps:
and S110, the control module receives a closing control instruction.
And S120, closing the first switch 5 and the second switch 6.
And S130, closing the (k + 1) th to the nth mechanical switches 1 to enable the direct current limiter to be closed.
If the direct current limiter receives a current limiting command, simultaneously sending a command to provide a conducting signal for the control ends of the 1 st to m controllable switch modules 2 to enable the controllable switch modules to be in a pre-conducting state, and then sending a command to enable the 1 st to k-th mechanical switches 1 and the k +1 th to n-th mechanical switches 1 to execute opening operation; when the arc voltage of the 1 st to kth mechanical switches 1 is greater than the threshold voltage of the corresponding controllable switch module 2, the controllable switch module 2 is in an "on" state, and the current passing through the 1 st to kth mechanical switches 1 is transferred to the corresponding controllable switch module 2. After a preset time, the k +1 th to nth mechanical switches 1 are extinguished, the controllable switch module 2 is switched on and off, the current is transferred to the resistive device 3 and limited, and the direct current limiter is in a current limiting state.
Specifically, after the controllable switch module 2 is turned on, the method further includes: receiving a command of finishing current limiting operation of the direct current limiter; the first switch 5 and the second switch 6 are turned off; and controlling a plurality of mechanical switches 1 to carry out closing operation. After the direct current limiter receives a signal of ending current limiting, the control module sends an instruction to enable the first switch 5 and the second switch 6 to be switched off, and then sends an instruction to enable the 1 st to the kth mechanical switches 1 to be switched on and off, so that switching-on operation is completed.
Optionally, the dc current limiter control method based on fast switching further includes: if the power transmission and distribution line is still in a fault state after reclosing, controlling the first switch 5 and the second switch 6 to be switched off; and controlling the closing of the mechanical switches 1 to perform closing operation.
Optionally, the dc current limiter control method based on fast switching further includes: and if the power transmission and distribution line is in a normal operation state after reclosing, controlling the mechanical switches 1 to be closed to carry out closing operation.
When the control system has a reclosing mechanism, if the circuit is still in a fault state after reclosing, the control module sends an instruction to open and close the first switch 5 and the second switch 6 after the fault is removed, and then sends instructions from 1 st to k-th mechanical switches 1 to complete the closing operation; and if the circuit is in a normal running state after reclosing, closing the 1 st to the kth mechanical switches 1 by the controller to finish the closing operation.
The embodiment of the invention aims to protect a direct current limiter based on a quick switch and a control method thereof, wherein the direct current limiter comprises the following components: the device comprises a plurality of mechanical switches, a plurality of controllable switch modules, a resistive device, a control module, a first switch and a second switch; a plurality of mechanical switches are sequentially connected in series, the number of the mechanical switches is n, and n is more than or equal to 1; the controllable switch modules are connected with one or more adjacent mechanical switches in parallel, the number of the controllable switch modules is m, the number of the mechanical switches connected with the controllable switch modules in parallel is k, and n is more than or equal to k and more than or equal to m and more than or equal to 1; two ends of the resistive device are respectively connected with the plurality of mechanical switches in parallel through the first switch and the second switch; the control module is respectively connected with the mechanical switch, the controllable switch module, the first switch and the second switch, and the adjustment of the current amplitude of the direct current limiter is achieved by controlling the on-off or off of the mechanical switch, the controllable switch module, the first switch and the second switch. The technical scheme has the following effects:
through connecting resistive device and a plurality of mechanical switch in parallel for when fault current surpassed the threshold value of setting for, resistive device inserts the electric line, reduces fault current amplitude, and the cooperation direct current circuit breaker accomplishes the cut-off fast, possesses advantages such as economic nature is good, the commonality is high and restriction fault current is fast.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A fast switching based dc current limiter comprising: the device comprises a plurality of mechanical switches, a plurality of controllable switch modules, a resistive device, a control module, a first switch and a second switch;
the mechanical switches are sequentially connected in series, the number of the mechanical switches is n, and n is more than or equal to 1;
the controllable switch modules are connected with one or more adjacent mechanical switches in parallel, the number of the controllable switch modules is m, the number of the mechanical switches connected with the controllable switch modules in parallel is k, and n is more than or equal to k and more than or equal to m and more than or equal to 1;
two ends of the resistive device are connected with the plurality of mechanical switches in parallel through the first switch and the second switch respectively;
the control module is respectively connected with the mechanical switch, the controllable switch module, the first switch and the second switch, and the adjustment of the current amplitude of the direct current limiter is realized by controlling the on/off of the mechanical switch, the controllable switch module, the first switch and the second switch.
2. A fast switching based dc current limiter according to claim 1 further comprising:
a first capacitance connected in parallel with the resistive device.
3. Fast switching based direct current limiter according to claim 1,
the mechanical switch is a vacuum switch or a high-speed isolating switch.
4. Fast switching based direct current limiter according to claim 1,
the controllable switch module is a series and/or parallel combination of a controllable electronic component or a plurality of power diodes;
the controllable electronic component is a single, multiple or mixed electronic component with unidirectional or bidirectional current-carrying breaking capacity.
5. Fast switching based direct current limiter according to claim 1,
the resistive device is a resistor, a ZnO arrester and/or an inductor.
6. A fast switching based dc current limiter control method for controlling the fast switching based dc current limiter according to any one of claims 1 to 5, wherein the dc current limiter from a closing state to a current limiting state comprises the following steps:
the control module receives a current-limiting operation instruction;
the control module sends a conducting signal to the controllable switch modules to enable the controllable switch modules to be in a pre-conducting state;
the control module controls a plurality of mechanical switches to start to execute opening operation;
when the arc voltage of the mechanical switch is greater than the conduction voltage drop of the controllable switch module connected in parallel with the mechanical switch, the controllable switch module is conducted, and the current flowing through the 1 st to the kth mechanical switches is transferred to the controllable switch module;
after a preset time, switching off the controllable switch module, switching off the arc of the (k + 1) th to nth mechanical switches, and transferring the current flowing through the controllable switch module and the (k + 1) th to nth mechanical switches to a resistive device to enable the direct current limiter to be in a current limiting state;
wherein, the closing state is: the 1 st to nth mechanical switches are switched on and off, the first switch and the second switch are switched on and off, and the controllable switch module is switched on and off.
7. The fast switching based dc current limiter control method of claim 6, wherein the dc current limiter further comprises the following steps from a current limiting state to a closing state:
the control module receives a current limiting releasing instruction, and closes the (k + 1) th to nth mechanical switches under the condition of ensuring that the 1 st to kth mechanical switches are closed, so that the direct current limiter is closed; or the like, or, alternatively,
when a closing instruction is not received but the direct current limiter works in a current limiting state for a preset time, under the condition that the 1 st to the kth mechanical switches are guaranteed to be closed, the (k + 1) th to the nth mechanical switches are closed, and the direct current limiter is closed.
8. The fast switching based dc current limiter control method of claim 6, wherein the dc current limiter further comprises the following steps from a closing state to an initial state:
the control module receives an operation quitting instruction;
opening the (k + 1) th to nth mechanical switches;
opening the first switch and the second switch.
9. The fast switching based dc current limiter control method of claim 6, wherein the dc current limiter further comprises the following steps from an initial state to a closed state:
the control module receives a closing control instruction;
closing the first switch and the second switch;
and closing the (k + 1) th to the nth mechanical switches to close the direct current limiter.
10. The control method of the fast switching based dc current limiter of claim 8, wherein the operations of closing the 1 st to kth mechanical switches are performed in a process from a closing state to a current limiting state, and are performed in a process from a current limiting state to a closing state.
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| CN202010909176.4A CN112260244A (en) | 2020-09-02 | 2020-09-02 | Direct current limiter based on quick switch and control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276045A (en) * | 2017-06-10 | 2017-10-20 | 中国科学院电工研究所 | A kind of mixed DC current limiting circuit breaker |
| CN110739167A (en) * | 2019-05-10 | 2020-01-31 | 许继集团有限公司 | DC switch equipment |
| DE102018214000A1 (en) * | 2018-08-20 | 2020-02-20 | Siemens Aktiengesellschaft | DC switching device and its use |
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- 2020-09-02 CN CN202010909176.4A patent/CN112260244A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276045A (en) * | 2017-06-10 | 2017-10-20 | 中国科学院电工研究所 | A kind of mixed DC current limiting circuit breaker |
| DE102018214000A1 (en) * | 2018-08-20 | 2020-02-20 | Siemens Aktiengesellschaft | DC switching device and its use |
| CN110739167A (en) * | 2019-05-10 | 2020-01-31 | 许继集团有限公司 | DC switch equipment |
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Application publication date: 20210122 |