CN111640602A - Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method - Google Patents
Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method Download PDFInfo
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- CN111640602A CN111640602A CN202010372484.8A CN202010372484A CN111640602A CN 111640602 A CN111640602 A CN 111640602A CN 202010372484 A CN202010372484 A CN 202010372484A CN 111640602 A CN111640602 A CN 111640602A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/548—Electromechanical and static switch connected in series
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
- H01H2009/543—Contacts shunted by static switch means third parallel branch comprising an energy absorber, e.g. MOV, PTC, Zener
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
- H01H2009/544—Contacts shunted by static switch means the static switching means being an insulated gate bipolar transistor, e.g. IGBT, Darlington configuration of FET and bipolar transistor
Abstract
The invention relates to a multi-break direct current switch device with controllable transfer branch oscillation current and a control method. The main through-current branch comprises a plurality of mechanical switches which are connected in series in a power transmission and distribution loop of a power system; the controllable branch circuit is composed of one or more controllable switch modules which are respectively connected with one or more mechanical switches in parallel; the transfer branch comprises an energy storage module and an energy storage auxiliary module, and all mechanical switches with controllable switch modules form a parallel connection relationship with the main through-current branch; the energy consumption device comprises a lightning arrester and is connected with all the mechanical switches in parallel through the switches connected in series on the two sides. The direct current switch equipment has enough on-off capacity and can quickly act with energy band load, can be used as a breaker or a load switch to be applied to a unipolar, bipolar and homopolar high-voltage direct current transmission line or a medium and low-voltage direct current distribution line, plays roles in controlling protection and isolating faults, and has the advantages of small volume, good economy, high universality and high breaking speed.
Description
Technical Field
The invention relates to the technical field of switch equipment, in particular to multi-break direct-current switch equipment with controllable transfer branch oscillation current and a control method.
Background
At present, due to the change of power production, transmission and consumption structures, a flexible direct current system becomes an important development direction of a power system, and a direct current circuit breaker plays a key role in the power transmission field and the power distribution field of the flexible direct current system.
The topology of the direct current breaker is more, but the reliability needs to be further verified. The current direct current breaker topological structure using the capacitor for current transfer has the problem of uncontrollable oscillation current. If the controllable electronic component is adopted to carry out bidirectional control on the oscillation current, the transmission cost is higher.
Disclosure of Invention
Aiming at the problem that the oscillating current of a topological structure of a direct current breaker for current transfer by using a capacitor cannot be controlled at present, the invention provides a multi-break direct current switch device with controllable oscillating current of a transfer branch circuit and a control method thereof, which can be applied to the fields of high voltage, medium voltage and low voltage and have the advantages of good economy, high universality and rapid on-off of the oscillating current.
In order to achieve the above object, the present invention provides a multi-break dc switch device with controllable oscillation current of a transfer branch, which is characterized in that the device comprises a main control branch, a controllable switch module, a transfer branch, an energy consumption branch, a first side switch and a second side switch;
the main control branch comprises first to nth mechanical switches which are sequentially connected in series in a power transmission and distribution loop of a power system; n is more than or equal to 1;
the controllable switch modules comprise first 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; m is more than 0 and less than or equal to k and less than or equal to n;
the transfer branch is connected in parallel through a series structure with first to a-th mechanical switches; k is not less than a and not more than n; (ii) a
And two ends of the energy consumption branch are respectively connected to two ends of the series structure of the first to nth mechanical switches under the control of the first side switch and the second side switch.
Further, the transfer branch comprises an energy storage module and an energy storage auxiliary module which are connected in series; the energy storage module is a capacitor or comprises: the resistor is connected in series with the discharge control switch and then connected in parallel with the capacitance element; the energy storage auxiliary module is a current limiting element.
Furthermore, the energy consumption branch is a lightning arrester.
Further, the transfer branch is controlled by the first side switch to be connected in parallel to the series structure of the first to the a-th mechanical switches.
Further, the controllable switch module comprises a bidirectional controllable switch and a lightning arrester connected in parallel with the bidirectional controllable switch; the bidirectional controllable switch is a bridge structure or a reverse series structure consisting of diodes, IGBTs, IECTs or GTOs.
Further, the first side switch and the second side switch are mechanical switches with insulation and isolation capabilities.
Further, the first to mth mechanical switches employ a disconnecting switch or a vacuum switch.
The invention also provides a control method of the transfer branch oscillation current controllable multi-break direct current switch device, which comprises the following steps:
1) the switching-on operation process comprises the following steps:
the initial state is that the first to the kth mechanical switches are closed, and all the other switches are disconnected;
if the system needs to be switched on, the transfer branch is controlled to release energy of an internal energy storage element, and an energy release loop is disconnected after the energy is released;
closing the first side switch and the second side switch;
closing the rest n-k mechanical switches to complete the closing operation;
2) the switching-off operation process:
the controller sends out a command to enable the control ends of the m controllable switch modules to provide a conducting signal to enable the control ends to be in a pre-conducting state, and then sends out a command to enable the 1 st to the nth mechanical switches to execute opening operation; when the arc voltage of any mechanical switch is greater than the threshold voltage of the controllable switch module connected in parallel with the mechanical switch, the controllable switch module connected in parallel with the mechanical switch is in a conducting state, and the current passing through the mechanical switch is transferred to the controllable switch module connected in parallel with the mechanical switch; if the terminal voltage of the controllable switch module exceeds the trigger threshold of the lightning arrester, triggering the lightning arrester in the controllable switch module to absorb energy;
after the preset time, the mechanical switch is put out of arc, the controllable switch module is turned off, the current is transferred to the transfer branch circuit, and an energy storage element in the transfer branch circuit is charged; charging to rapidly raise the voltage of the energy storage element, triggering the energy consumption branch circuit to act and absorbing the residual energy; when the 1 st to nth mechanical switches recover the insulating capability, the oscillating current generated by the transfer branch circuit is cut off;
after the preset time, the oscillating current generated by the transfer branch circuit is cut off, the controller sends out an instruction to break the first side switch (6) and the second side switch (7), and then sends out an instruction to close the first mechanical switch to the kth mechanical switch.
Further, after the direct current switch equipment is disconnected, the controller sends an instruction to enable the multi-fracture direct current switch equipment with controllable oscillation current of the equipment transfer branch to execute a switching-on operation process, judgment is carried out, and if a fault signal of a system is not received again after the direct current switch equipment is switched on, switching-on is completed; and if the fault signal of the system is received again after the direct current switch equipment is switched on, the switching-off operation process is executed.
The technical scheme of the invention has the following beneficial technical effects:
(1) the direct current switch equipment has enough on-off capacity and quick action of energy band load, can be used as a breaker or a load switch to be applied to a unipolar, bipolar and homopolar high-voltage direct current transmission line or a medium and low voltage direct current distribution line, plays roles in controlling protection and isolating faults, and has the advantages of small volume, good economy, high universality and high breaking speed.
(2) The front m mechanical switches are connected in parallel with the controllable switch module, and other mechanical switches are not connected in parallel, so that the cost can be reduced, and the control complexity can be reduced.
(3) The first side switch and the second side switch are arranged, so that obvious breakpoints can be formed and a reliable insulation gap can be established when equipment is overhauled.
(4) The transfer branch circuit is connected in parallel with the series structure of the 1 st to the a th mechanical switches, so that the reliability of the switch equipment can be ensured when the switch equipment is switched on or switched off.
Drawings
Fig. 1 is a schematic structural diagram of a multi-break direct current switch device with controllable transfer branch oscillation current;
fig. 2 is an embodiment of a three-break series dc switching device with controllable transfer branch oscillation current according to the present invention;
FIG. 3 is a three-fracture series structure embodiment of the present invention in which controllable branches are connected using electronic components in a bridge connection;
fig. 4 is an embodiment of the invention of a three-fracture series structure with a transfer branch directly connected in parallel at two ends of a mechanical 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.
The invention provides a multi-fracture direct current switch device with controllable transfer branch oscillation current, which is combined with a graph 1 and comprises a main control branch, a controllable switch module, a transfer branch, an energy consumption branch, a first side switch 6 and a second side switch 7.
The main control branch comprises first to nth mechanical switches 1-1 to 1-n which are sequentially connected in series in a power transmission and distribution loop of a power system; n is more than or equal to 1.
The controllable switch module comprises a first controllable switch module, a second controllable switch module and a third controllable switch module, wherein each controllable switch module can form a parallel connection relation with any single or adjacent mechanical switches, and the total k mechanical switches form a parallel connection relation with the controllable switch modules; m is more than 0 and less than or equal to k and less than or equal to n.
The transfer branch is connected in parallel through a series structure with first to a-th mechanical switches; k is less than or equal to a and less than or equal to n.
And two ends of the energy consumption branch are respectively connected to two ends of the series structure of the first to nth mechanical switches under the control of the first side switch 6 and the second side switch 7.
Further, the transfer branch may be connected to point a, and the series configuration connected in parallel to the first to a-th mechanical switches is controlled by the first side switch 6; the first side switch 6 may serve as an isolation. The transfer branch may be connected to point B in parallel to the series arrangement of the first to a-th mechanical switches. The first side switch 6 and the second side switch 7 are mechanical switches with insulation and isolation capabilities.
Further, the transfer branch comprises an energy storage module 3 and an energy storage auxiliary module 4 which are connected in series; the energy storage module 3 includes: the resistor is connected in series with the discharge control switch and then connected in parallel with the capacitance element; if the resistors are connected in parallel, the resistors can absorb the energy of the capacitive element after the breaker is disconnected, and the condition of meeting the reclosing function in a short time is met. The mechanical switch is connected in series in the main through-current branch, and the transfer branch can cut off the oscillation current generated by the capacitive and inductive components in the transfer branch when the mechanical switch recovers the insulating capability in the process of opening the brake.
Further, the energy storage auxiliary module 4 is a current limiting element, and may be a resistor, an inductor, or the like, and the energy storage auxiliary module 4 may play a role in limiting current.
Furthermore, the energy consumption branch is a lightning arrester 5 which absorbs energy in the loop after being conducted.
Further, the controllable switch module comprises a bidirectional controllable switch and a lightning arrester connected in parallel with the bidirectional controllable switch. The bidirectional controllable switch can be a controllable electronic component, can be a series-parallel combination of the controllable electronic component and the power diode, and the controllable electronic component can be a single, multiple or mixed electronic component (such as IGBT/IECT, GTO and the like) and has unidirectional or bidirectional current carrying and turn-off capabilities.
Further, the first to mth mechanical switches employ a disconnecting switch or a vacuum switch.
The invention also provides a control method of the transfer branch oscillation current controllable multi-break direct current switch device, which comprises the following steps:
1) the switching-on operation process comprises the following steps:
the initial state is that the first to the mth mechanical switches are closed, and all the other switches are disconnected;
if the system needs to be switched on, the transfer branch is controlled to release energy of an internal energy storage element, and an energy release loop is disconnected after the energy is released;
closing the first side switch 6 and the second side switch 7;
closing the rest n-k mechanical switches to complete the closing operation;
2) the switching-off operation process:
the controller sends out a command to enable the control ends of the m controllable switch modules to provide a conducting signal to enable the control ends to be in a pre-conducting state, and then sends out a command to enable the 1 st to the nth mechanical switches to execute opening operation; when the arc voltage of any mechanical switch is greater than the threshold voltage of the controllable switch module connected in parallel with the mechanical switch, the controllable switch module connected in parallel with the mechanical switch is in a conducting state, and the current passing through the mechanical switch is transferred to the controllable switch module connected in parallel with the mechanical switch; and if the terminal voltage of the controllable switch module is overlarge, triggering the lightning arrester in the step 2 to enable the lightning arrester to absorb energy, and protecting power electronic components. The pre-conducting is the power electronic component (such as IGBT/IECT, GTO, etc.) of the controllable switch module, and the state (conducting or cutting off) of the power electronic component can be controlled. Two conditions are required for the conduction of power electronic components: the control end has a trigger signal, and the end voltage of the device is greater than the threshold voltage. If the control end of the power electronic component has a trigger signal, the power electronic component is in a pre-conduction state; if the voltage at the same time is larger than the threshold voltage, the power electronic component is in a conducting state.
After the preset time, the mechanical switch is put out of arc, the controllable switch module is turned off, the current is transferred to the transfer branch circuit, and an energy storage element in the transfer branch circuit is charged; charging to rapidly raise the voltage of the energy storage element, triggering the energy consumption branch circuit to act and absorbing the residual energy; when the 1 st to nth mechanical switches recover the insulating capability, the oscillating current generated by the transfer branch circuit is cut off;
after the direct current switch equipment passes through the preset time, the oscillating current generated by the transfer branch is cut off, the controller sends out an instruction to break the first side switch 6 and the second side switch 7, and then sends out an instruction to close the first mechanical switch, the second mechanical switch, the third mechanical switch and the kth mechanical switch.
Further, after the direct current switching device is disconnected, the controller sends an instruction to enable the multi-fracture direct current switching device with controllable oscillation current of the device transfer branch to execute a switching-on operation process, judgment is carried out, and if a fault signal of the system is not received again after the direct current switching device is switched on, switching-on is completed; and if the fault signal of the system is received again after the direct current switch equipment is switched on, the switching-off operation process is executed. In the power system, relay protection equipment exists, whether a loop is a fault loop or not is judged, and if the loop is in fault, a signal is sent to switch equipment. Faults include grounding, short circuits, open circuits, etc.
Example 1
Fig. 1 shows an embodiment of a three-break dc switch device with controllable transfer branch oscillation current, the dc switch device includes a mechanical switch 1-1, a mechanical switch 1-2, a mechanical switch 1-3, a bidirectional controllable switch module 2, an energy storage module 3, an energy storage auxiliary module (inductor) 4, an arrester 5, a first side switch 6 and a second side switch 7, wherein the energy storage module 3 is composed of a capacitor 3-1, a switch 3-2 and a resistor 3-3. The main through-current branch of the direct-current switch equipment is mainly formed by connecting a mechanical switch 1-1, a mechanical switch 1-2 and a mechanical switch 1-3 in series, wherein one mechanical switch is connected with a bidirectional controllable switch module 2 in parallel; the transfer branch circuit is formed by connecting the energy storage module 3 and the inductor 4 in series, and is connected in parallel to two ends of the mechanical switch 1-1 and the mechanical switch 1-2 through the switch 6. The energy consumption branch circuit is composed of an arrester 5 and is connected in parallel at two ends of the 3 mechanical switches of the main through-current branch circuit through a first side switch 6 and a second side switch 7 which are connected in series.
The two-way controllable switch module 2 comprises two series-connected IGBTs and an arrester, and each IGBT is connected with a freewheeling diode in parallel. If the system needs to be opened, the controller sends out a command, the bidirectional controllable switch module 2 is turned on in advance, that is, the control terminal of the IGBT provides a turn-on signal to make it in a "pre-on" state, when the arc voltage of the mechanical switch 1-1 is greater than the threshold voltage of the bidirectional controllable switch module 2, the two IGBTs connected in series of the bidirectional controllable switch module 2 are in a "on" state, and the current of the mechanical switch 1-1 is transferred to the controllable switch modules connected in parallel with the mechanical switch module. If the terminal voltage of the controllable switch module is too large, the lightning arrester in the bidirectional controllable switch module 2 is triggered to absorb energy, so that power electronic components are protected.
The switching process comprises the following steps:
1) the switching-on operation process comprises the following steps:
as shown in fig. 1, the initial state of the dc switch is in the open position (the mechanical switch 1-1 is closed, the mechanical switch 1-2, the mechanical switch 1-3, the switch 6, the switch 7 and the switch 3-2 are open). If the system needs to be switched on, the switch 3-2 is firstly switched on, and the energy stored in the capacitor 3-1 is released through the resistor 3-3 to complete pre-switching on; after the energy is released, the switch 3-2 is firstly disconnected, then the switch 6 and the switch 7 are closed, and finally the mechanical switch 1-2 and the mechanical switch 1-3 are closed, so that the main through-current branch is conducted, and the switching-on operation is completed.
2) The switching-off operation process:
as shown in fig. 1, the initial state of the dc switch is in the on position (the mechanical switch 1-1, the mechanical switch 1-2, the mechanical switch 1-3, the switch 6 and the switch 7 are off, the switch 3-2 is off, and the main current branch carries the rated current). If the system needs to be switched off, the controller sends a command to pre-conduct the bidirectional controllable switch module 2, and simultaneously sends a command to enable the mechanical switch 1-1, the mechanical switch 1-2 and the mechanical switch 1-3 to start to execute switching-off operation; when the arc voltage of the mechanical switch 1-1 is greater than the threshold voltage of the bidirectional controllable switch module 2, the current passing through the mechanical switch 1-1 is transferred into the bidirectional controllable switch module 2, and the mechanical switch 1-1 is extinguished and the insulating capability is recovered; after the current of the mechanical switch 1-1 is completely transferred to the bidirectional controllable switch module 2, the bidirectional controllable switch module 2 is turned off, and the current of the main through-current branch is quickly transferred to the capacitor 3 for charging; before the voltage of the capacitor 3 reaches the withstand voltage value of the bidirectional controllable switch module 2, the electric arc of a fracture of the mechanical switch 1-2 is extinguished, and the insulating capability is recovered; the voltage of the capacitor 3 is rapidly increased by charging, and the rapidly increased voltage triggers the lightning arrester 5 to act and absorb the residual energy; when the mechanical switch 1-3 recovers the insulating capability, the mechanical switch 1-3 cuts off the oscillating current generated by the transfer branch, and the transfer branch has no current to pass through, thereby completing the breaking. After the breaker is disconnected, the controller firstly sends out an instruction to disconnect the switch 6 and the switch 7, and then sends out an instruction to close the mechanical switch 1-1.
After the breaker is disconnected, the controller sends an instruction to enable the equipment to execute a closing process. If the breaker is not switched on to a fault loop, the main through-flow branch bears the rated current of the system, and the switching-on is completed; and if the breaker is switched on to a fault loop, repeating the switching-off process.
Example 2
As shown in fig. 2, the operation principle and operation process of the bidirectional controllable switch module 2, which is similar to those of embodiment 1, is the same as those of embodiment 1, except that the bidirectional controllable switch module is replaced with a bridge switch module composed of electronic components.
Example 3
As shown in fig. 3, similar to embodiment 1, but the transfer branch is directly connected in parallel to the two ends of the mechanical switch 1-1 and the mechanical switch 1-2, not through the first side switch 6, and the working principle and working process are the same as embodiment 1.
In summary, the invention relates to a multi-break dc switch device with controllable oscillating current of a branch circuit and a control method thereof, which can be applied to the field of dc power transmission and distribution of high-voltage, medium-voltage and low-voltage grades. The main through-current branch of the direct current switch equipment comprises a plurality of mechanical switches which are connected in series in a power transmission and distribution loop of a power system; the controllable branch circuit is composed of one or more controllable switch modules which are respectively connected with one or more mechanical switches in parallel; the transfer branch comprises an energy storage module and an energy storage auxiliary module, and all mechanical switches with controllable switch modules form a parallel connection relationship with the main through-current branch; the energy consumption device comprises a lightning arrester and is connected with all the mechanical switches in parallel through the switches connected in series on the two sides. The direct current switch equipment has enough on-off capacity and can quickly act with energy band load, can be used as a breaker or a load switch to be applied to a unipolar, bipolar and homopolar high-voltage direct current transmission line or a medium and low-voltage direct current distribution line, plays roles in controlling protection and isolating faults, and has the advantages of small volume, good economy, high universality and high breaking speed.
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 (9)
1. A multi-break direct current switch device with controllable transfer branch oscillation current is characterized by comprising a main control branch, a controllable switch module, a transfer branch, an energy consumption branch, a first side switch (6) and a second side switch (7);
the main control branch comprises first to nth mechanical switches which are sequentially connected in series in a power transmission and distribution loop of a power system; n is more than or equal to 1;
the controllable switch modules comprise first 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; m is more than 0 and less than or equal to k and less than or equal to n;
the transfer branch is connected in parallel with the series structure of the first to the a-th mechanical switches, and k is more than or equal to a and less than or equal to n;
and two ends of the energy consumption branch circuit are respectively connected to two ends of the series structure of the first to nth mechanical switches under the control of the first side switch (6) and the second side switch (7).
2. The multi-break direct current switching device with controllable transfer branch oscillation current according to claim 1, characterized in that the transfer branch comprises an energy storage module (3) and an energy storage auxiliary module (4) connected in series; the energy storage module (3) is a capacitor or comprises: the resistor is connected in series with the discharge control switch and then connected in parallel with the capacitance element; the energy storage auxiliary module (4) is a current limiting element.
3. The switchyard of claim 1 or 2, characterized in that the energy consuming branch is a lightning arrester (5).
4. The transfer branch oscillating current controllable multi-break direct current switching device according to claim 1 or 2, characterized in that the transfer branch controls a series arrangement in parallel to first to a-th mechanical switches through a first side switch (6).
5. The multi-break direct current switch device with controllable transfer branch oscillation current according to claim 1 or 2, wherein the controllable switch module comprises a bidirectional controllable switch and an arrester connected in parallel with the bidirectional controllable switch; the bidirectional controllable switch is a bridge structure or a reverse series structure consisting of diodes, IGBTs, IECTs or GTOs.
6. The multi-break direct current switching device with controllable branch circuit oscillation current according to claim 1 or 2, characterized in that the first side switch (6) and the second side switch (7) are mechanical switches with insulation and isolation capabilities.
7. The transfer branch oscillating current controllable multi-break direct current switch device according to claim 1 or 2, characterized in that the first to m-th mechanical switches are isolation switches or vacuum switches.
8. A method for controlling a multi-tap dc switch device with controlled oscillating current in a branch according to any one of claims 1 to 7, comprising:
1) the switching-on operation process comprises the following steps:
the initial state is that the first to the kth mechanical switches are closed, and all the other switches are disconnected;
if the system needs to be switched on, the transfer branch is controlled to release energy of an internal energy storage element, and an energy release loop is disconnected after the energy is released;
closing the first side switch (6) and the second side switch (7);
closing the rest n-k mechanical switches to complete the closing operation;
2) the switching-off operation process:
the controller sends out a command to enable the control ends of the m controllable switch modules to provide a conducting signal to enable the control ends to be in a pre-conducting state, and then sends out a command to enable the 1 st to the nth mechanical switches to execute opening operation; when the arc voltage of any mechanical switch is greater than the threshold voltage of the controllable switch module connected in parallel with the mechanical switch, the controllable switch module connected in parallel with the mechanical switch is in a conducting state, and the current passing through the mechanical switch is transferred to the controllable switch module connected in parallel with the mechanical switch; if the terminal voltage of the controllable switch module exceeds the trigger threshold of the lightning arrester, triggering the lightning arrester in the controllable switch module to absorb energy;
after the preset time, the mechanical switch is put out of arc, the controllable switch module is turned off, the current is transferred to the transfer branch circuit, and an energy storage element in the transfer branch circuit is charged; charging to rapidly raise the voltage of the energy storage element, triggering the energy consumption branch circuit to act and absorbing the residual energy; when the 1 st to nth mechanical switches recover the insulating capability, the oscillating current generated by the transfer branch circuit is cut off;
after the preset time, the oscillating current generated by the transfer branch circuit is cut off, the controller sends out an instruction to break the first side switch (6) and the second side switch (7), and then sends out an instruction to close the first mechanical switch to the kth mechanical switch.
9. The control method according to claim 8, characterized in that: after the direct current switch equipment is disconnected, the controller sends an instruction to enable the multi-fracture direct current switch equipment with controllable oscillation current of the equipment transfer branch to execute a switching-on operation process, judgment is carried out, and if a fault signal of a system is not received again after the direct current switch equipment is switched on, switching-on is completed; and if the fault signal of the system is received again after the direct current switch equipment is switched on, the switching-off operation process is executed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372484.8A CN111640602A (en) | 2020-05-06 | 2020-05-06 | Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372484.8A CN111640602A (en) | 2020-05-06 | 2020-05-06 | Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421589A (en) * | 2020-12-01 | 2021-02-26 | 平高集团有限公司 | Hybrid direct current breaker with graded turn-off |
| CN112865516A (en) * | 2021-02-26 | 2021-05-28 | 华北电力大学 | Active resonance type direct current change-over switch and control method thereof |
| CN113299504A (en) * | 2021-04-22 | 2021-08-24 | 西安交通大学 | Magnetic control oscillation type direct current breaker with multi-medium fractures connected in series |
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| CN105656019A (en) * | 2016-01-26 | 2016-06-08 | 华中科技大学 | Capacitive charging DC breaker and application thereof |
| CN110739167A (en) * | 2019-05-10 | 2020-01-31 | 许继集团有限公司 | DC switch equipment |
| CN110880749A (en) * | 2019-11-01 | 2020-03-13 | 广东电网有限责任公司 | Overvoltage device for limiting direct current breaker to ground |
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| CN103997322A (en) * | 2014-05-27 | 2014-08-20 | 西安交通大学 | Full-solidity direct-current breaker and control method thereof |
| CN105656019A (en) * | 2016-01-26 | 2016-06-08 | 华中科技大学 | Capacitive charging DC breaker and application thereof |
| CN110739167A (en) * | 2019-05-10 | 2020-01-31 | 许继集团有限公司 | DC switch equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421589A (en) * | 2020-12-01 | 2021-02-26 | 平高集团有限公司 | Hybrid direct current breaker with graded turn-off |
| CN112865516A (en) * | 2021-02-26 | 2021-05-28 | 华北电力大学 | Active resonance type direct current change-over switch and control method thereof |
| CN113299504A (en) * | 2021-04-22 | 2021-08-24 | 西安交通大学 | Magnetic control oscillation type direct current breaker with multi-medium fractures connected in series |
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