CN117498284B - Series compensation capacitor device based on short-circuit fault current intelligent self-driving - Google Patents
Series compensation capacitor device based on short-circuit fault current intelligent self-driving Download PDFInfo
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- CN117498284B CN117498284B CN202311417009.8A CN202311417009A CN117498284B CN 117498284 B CN117498284 B CN 117498284B CN 202311417009 A CN202311417009 A CN 202311417009A CN 117498284 B CN117498284 B CN 117498284B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 101
- 230000007246 mechanism Effects 0.000 claims abstract description 32
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- 230000009471 action Effects 0.000 claims description 15
- 230000003750 conditioning effect Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
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- 230000000694 effects Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
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- 238000007599 discharging Methods 0.000 description 1
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Classifications
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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
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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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
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a series compensation capacitor device based on intelligent self-driving of short-circuit fault current, which can limit the voltage between series compensation capacitors in the case of short-circuit fault through a voltage limiting device and a fast switch to realize the voltage-limiting protection of the series compensation capacitors, wherein when the short-circuit fault occurs, the voltage between the series compensation capacitors can be limited through the voltage limiting device, and then a driving circuit triggers the power electronic on-off control switch to act, so that the moving and static repulsive force coils of an electromagnetic repulsive force mechanism pass through the short-circuit fault current, thereby generating electromagnetic repulsive force between the two coils, driving the contacts of a vacuum arc extinguishing part to be fast closed, realizing the closing of the fast switch, bypassing the series compensation capacitors, and further realizing the voltage-limiting protection of the series compensation capacitors. The invention can realize the voltage-limiting protection of the series compensation voltage based on the short-circuit fault current without an external power supply, and is applicable to lines with any voltage class.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a series compensation capacitor device based on intelligent self-driving of short-circuit fault current.
Background
At present, the 110kV high-voltage power grid in most areas has the defects of relatively small population density, relatively dispersed power load, large fluctuation and relatively common long-distance power transmission, so that the problem of voltage quality at the tail end of the load is serious, and particularly the problem of voltage fluctuation caused by heavy load start-stop is particularly remarkable.
In order to solve the problem of voltage fluctuation in a power transmission and distribution system, the reactive compensation method adopted has modes of parallel capacitor compensation, serial capacitor compensation and the like. The parallel capacitor compensation mode can improve the power factor of the load, reduce the line transmission current and reduce the line voltage loss, and although the line terminal voltage is improved, the power consumption requirement of a user is difficult to meet. The series capacitor compensation mode is that the line inductance is reduced, which is equivalent to the reduction of the electrical distance and the equivalent impedance of the line, so that the line voltage loss is reduced, and the line terminal voltage level is improved.
At present, the applied series compensation capacitor device has good effect, but cannot be applied to any voltage class line, and when a short circuit fault occurs, the series compensation capacitor circuit needs an external power supply to realize voltage limiting protection. Therefore, it is necessary to provide a series compensation capacitor device suitable for any voltage class without an external power supply.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide an intelligent self-driven series compensation capacitor device based on short-circuit fault current, which can realize voltage protection of series compensation capacitor based on short-circuit fault current generated by short-circuit fault without external power supply, and is applicable to lines of any voltage class, and has the characteristics of light weight, small volume, good economy and high reliability.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the utility model provides a series compensation capacitance device based on short circuit fault current intelligence self-driven, includes inlet end, play line end, main circuit and control circuit, main circuit includes power electronics break-make control switch, fast switch, voltage limiting device, reactor, resistance and series compensation capacitance, voltage limiting device is two-way power electronics switch or arrester, power electronics break-make control switch with fast switch connects, fast switch forms first branch road after connecting in parallel with voltage limiting device, reactor forms the second branch road after connecting in parallel with the resistance, first branch road with after the second branch road is established ties, with series compensation capacitance is respectively parallelly connected between inlet end and the outlet end; the control circuit comprises a current detection TC, a main controller and a driving circuit, wherein the main controller is respectively connected with the current detection TC and the driving circuit, and the driving circuit is connected with the power electronic on-off control switch;
the circuit is in a normal working state, the fast switch is in an off state, and normal working current passes through the series compensation capacitor from the incoming line end to the outgoing line end; when a circuit has a short circuit fault and the voltage limiting device is the bidirectional power electronic switch, and the main controller detects that the short circuit current is larger than a preset value through the current detection TC, the main controller sends a driving signal to the driving circuit so that the driving circuit drives the bidirectional power electronic switch and the power electronic on-off control switch to be conducted, and the power electronic on-off control switch is conducted so that the quick switch is in a closed state under the action of the short circuit current, thereby realizing the voltage limiting protection of the series compensation capacitor; when a short circuit fault occurs on a circuit, the voltage limiting device is the lightning arrester, and the voltages at two ends of the series compensation capacitor reach residual voltage of the lightning arrester, the lightning arrester acts to limit the voltages at two ends of the series compensation capacitor, and the main controller drives the power electronic on-off control switch to be conducted through the driving circuit, so that the fast switch is in a closed state under the action of short circuit current, and voltage limiting protection of the series compensation capacitor is achieved.
Preferably, the fast switch comprises a vacuum arc extinguishing part and an electromagnetic repulsion mechanism, and the electromagnetic repulsion mechanism is used for driving the vacuum arc extinguishing part to close or open so as to enable the fast switch to be in a closed or open state.
Preferably, when the series compensation capacitor device is applied to a line with small rated current, the electromagnetic repulsion mechanism is connected in series with the vacuum arc extinguishing part and then connected in parallel with the voltage limiting device to form the first branch, wherein the power electronic on-off control switch is connected with the electromagnetic repulsion mechanism.
Preferably, when the series compensation capacitor device is applied to a line with a large rated current, the main circuit further comprises a shunt TC, the shunt TC is arranged at the inlet end and is connected with the electromagnetic repulsion mechanism through the power electronic on-off control switch, and the vacuum arc extinguishing part and the voltage limiting device are connected in parallel to form the first branch.
Preferably, the electromagnetic repulsion mechanism comprises a dynamic repulsion coil and a static repulsion coil, one end of the static repulsion coil is connected with the wire inlet end, the other end of the static repulsion coil is connected with the vacuum arc extinguishing part, and the power electronic on-off control switch is connected with the dynamic repulsion coil.
Preferably, the electromagnetic repulsion mechanism comprises a dynamic repulsion coil and a static repulsion coil, and the power electronic on-off control switch is respectively connected with the dynamic repulsion coil and the static repulsion coil.
Preferably, the device further comprises an energy taking TC and a switching power supply, wherein the energy taking TC is used for taking energy from a circuit, converting the taken alternating current into direct current through the switching power supply and supplying power to the main controller.
Preferably, the control circuit further comprises a signal conditioning circuit, the signal conditioning circuit is connected with the current detection TC, and the signal conditioning circuit is used for performing signal processing on the short-circuit current detected by the current detection TC.
Preferably, the control circuit further comprises an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is respectively connected with the signal conditioning circuit and the main controller, and the analog-to-digital conversion circuit is used for converting the signals processed by the signal conditioning circuit into digital signals and transmitting the digital signals to the main controller.
Preferably, the control circuit further comprises a wireless radio frequency module, and the wireless radio frequency module is used for communicating the series compensation capacitance device with external equipment to realize a remote control function.
The invention has at least the following technical effects:
the intelligent self-driven series compensation capacitor device based on the short-circuit fault current can limit the voltage between the series compensation capacitors during short-circuit fault through the voltage limiting device and the fast switch, so as to realize the voltage-limiting protection of the series compensation capacitors, particularly when the short-circuit fault occurs, the voltage between the series compensation capacitors can be limited through the voltage limiting device, then the driving circuit triggers the power electronic on-off control switch to act, so that the moving repulsion coil and the static repulsion coil of the electromagnetic repulsion mechanism pass through the short-circuit fault current, electromagnetic repulsion force is generated between the two coils, the contacts of the vacuum arc extinguishing part are driven to be fast closed, the fast switch is closed, the series compensation capacitors are bypassed, and the voltage-limiting protection of the series compensation capacitors is realized. Compared with the traditional series compensation device, the device does not need to provide an external power supply, but uses short-circuit fault current to intelligently self-drive an electromagnetic repulsion mechanism to act, and compared with the traditional series compensation device, the device has no energy storage capacitor of a fast switch, and can realize repeated reclosing in a short time; in addition, the invention also provides two circuit structures, so that the circuit structure can be applied to a circuit with large rated current and a circuit with small rated current, thereby meeting the application requirements of any voltage class; the invention has the advantages of simple structure, small volume, light weight, high action speed, high reliability and good economy.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a series compensation capacitor device based on intelligent self-driving of short-circuit fault current according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a series compensation capacitor device based on intelligent self-driving of short-circuit fault current according to another embodiment of the present invention.
Detailed Description
The present embodiment is described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A series compensation capacitor device based on the intelligent self-driving of the short-circuit fault current of the present embodiment is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a series compensation capacitor device based on intelligent self-driving of short-circuit fault current according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a series compensation capacitor device based on intelligent self-driving of short-circuit fault current according to another embodiment of the present invention. The structure shown in fig. 1 is suitable for the case where the rated current of the line is small, and the structure shown in fig. 2 is suitable for the case where the rated current of the line is large. In fig. 1, the line current directly flows through the static repulsive force coil 122, wherein the wire section of the dynamic repulsive force coil 121 is small, the number of turns is large, and the wire section of the static repulsive force coil 122 is small. In fig. 2, the line current flows through the moving repulsive force coil 121 and the static repulsive force coil 122 after the current flowing through the shunt TC13 (TC is a current sensor) is changed into a small current, wherein the moving repulsive force coil 121 and the static repulsive force coil 122 have the same wire cross section and number of turns.
For the case of small rated line current, the circuit structure of the intelligent self-driven series compensation capacitor device based on short-circuit fault current is shown in fig. 1. The device is arranged in a shell 1 and comprises a wire inlet end P1, a wire outlet end P2, a main circuit and a control circuit, wherein the main circuit comprises a power electronic on-off control switch 2, a fast switch 3, a voltage limiting device 4, a reactor 5, a resistor 6 and a series compensation capacitor 7, and the voltage limiting device 4 is a bidirectional power electronic switch or a lightning arrester. The power electronic on-off control switch 2 is connected with the fast switch 3, the fast switch 3 is connected with the voltage limiting device 4 in parallel to form a first branch, the reactor 5 is connected with the resistor 6 in parallel to form a second branch, and the first branch is connected with the second branch in series and then is connected with the series compensation capacitor 7 in parallel between the wire inlet end P1 and the wire outlet end P2.
The control circuit comprises a current detection TC8, a main controller 9 and a driving circuit 10, wherein the main controller 9 is respectively connected with the current detection TC8 and the driving circuit 10, and the driving circuit 10 is connected with the power electronic on-off control switch 2.
In this embodiment, in a normal working state of the line, the fast switch 3 is in an off state, and a normal working current passes through the coil in the fast switch 3 from the wire inlet end P1 to the series compensation capacitor 7 and then is output to the wire outlet end P2; when a circuit has a short circuit fault and the voltage limiting device 4 is a bidirectional power electronic switch, and the main controller 9 detects that the short circuit current is larger than a preset value through the current detection TC8, the main controller 9 sends a driving signal to the driving circuit 10, so that the driving circuit 10 drives the bidirectional power electronic switch and the power electronic on-off control switch 2 to be conducted, the power electronic on-off control switch 2 is conducted, the fast switch 3 is in a closed state under the action of the short circuit current, the reactor 5, the resistor 6 and the series compensation capacitor 7 are connected in parallel, and the device presents small inductive impedance to the outside as a whole because the inductive reactance of the reactor 5 is small, thereby reducing the voltage at two ends of the series compensation capacitor 7 and further playing a role in protecting the series compensation capacitor 7.
Specifically, the fast switch 3 is a self-driven fast switch, the voltage limiting device 4 is a bidirectional power electronic switch or a lightning arrester, the inductance value of the reactor 5 is far smaller than the capacitance value of the series compensation capacitor 7, and the inductance value of the reactor 5 is also far smaller than the resistance value of the resistor 6. In normal operation, the fast switch 3 and the voltage limiting device 4 are disconnected, and only the series compensation capacitor 7 is put into a circuit, so that the series compensation function is achieved. After the short circuit fault occurs, the current limiting device 4 is immediately conducted, the fast switch 3 is conducted after the inherent closing time of a few milliseconds, the series compensation capacitor 7 is bypassed, the reactor 5 and the resistor 6 are put into use, and the overall equivalent impedance of the device is the parallel impedance of the reactor 5, the resistor 6 and the series compensation capacitor 7. Since the inductance of the reactor 5 is very small, the device presents very small inductive impedance to the outside as a whole, so the voltage at both ends of the series compensation capacitor 7 can be reduced, thereby playing a role in voltage limiting protection.
Further, when a short circuit fault occurs in the circuit and the voltage limiting device 4 is a lightning arrester, and the voltages at two ends of the series compensation capacitor 7 reach the residual voltage of the lightning arrester, the lightning arrester acts to limit the voltages at two ends of the series compensation capacitor 7, and the main controller 9 drives the power electronic on-off control switch 2 to be conducted through the driving circuit 10, so that the fast switch 3 is in a closed state under the action of short circuit current, and voltage limiting protection of the series compensation capacitor 7 is achieved.
The fast switch 3 comprises a vacuum arc extinguishing part 11 and an electromagnetic repulsion mechanism 12, wherein the electromagnetic repulsion mechanism 12 is used for driving the vacuum arc extinguishing part 11 to be switched on or switched off so that the fast switch 3 is in a closed or open state.
When the series compensation capacitor device is applied to a line with small rated current, the circuit structure is shown in fig. 1, and after the electromagnetic repulsion mechanism 12 is connected in series with the vacuum arc extinguishing part 11, the first branch is formed by connecting the first branch with the voltage limiting device 4 in parallel, wherein the power electronic on-off control switch 2 is connected with the electromagnetic repulsion mechanism 12.
Specifically, the electromagnetic repulsion mechanism 12 includes a moving repulsion coil 121, a static repulsion coil 122, a brake-separating holding spring 123 and an adjusting nut 124, wherein one end of the static repulsion coil 122 is connected with the wire inlet end P1, the other end of the static repulsion coil 122 is connected with the vacuum arc extinguishing portion 11, and the power electronic on-off control switch 2 is specifically connected with the moving repulsion coil 121. The opening retaining spring 123 is in a compressed state in a normal state, the elasticity of the opening retaining spring 123 can overcome the self-closing force of the vacuum arc extinguishing part 11, so that the moving contact and the fixed contact of the vacuum arc extinguishing part 11 are kept in a normally open state, and the opening distance of the contacts can be adjusted by adopting the adjusting nut 124.
When the series compensation capacitor device is applied to a line with a large rated current, as shown in fig. 2, the main circuit further includes a shunt TC13, where the shunt TC13 is disposed at the line inlet end P1 and is connected to the electromagnetic repulsion mechanism 12 through the power electronic on-off control switch 2, where the vacuum arc extinguishing portion 11 is connected in parallel with the voltage limiting device 4 to form a first branch, that is, the electromagnetic repulsion mechanism 12 is not connected to the vacuum arc extinguishing portion 11 in a line, and the electromagnetic repulsion mechanism 12 is only used to drive the vacuum arc extinguishing portion 11. In this embodiment, the power electronic on-off control switch 2 is specifically connected to the dynamic repulsive force coil 121 and the static repulsive force coil 122, respectively.
With continued reference to fig. 1 and 2, the apparatus further includes an energy taking TC14 and a switching power supply 15, such as an AC/DC (alternating current/direct current) power supply, where the energy taking TC14 is used to take energy from the line, and after converting the taken alternating current into direct current by the switching power supply 15, power is supplied to the main controller 9.
Further, the control circuit further includes a signal conditioning circuit 16, where the signal conditioning circuit 16 is connected to the current detecting TC8, and the signal conditioning circuit 16 is configured to perform signal processing on the short-circuit current detected by the current detecting TC8, so as to obtain a current analog signal. The control circuit further comprises an analog-to-digital conversion circuit 17, namely an ADC module, wherein the analog-to-digital conversion circuit 17 is respectively connected with the signal conditioning circuit 16 and the main controller 9, and the analog-to-digital conversion circuit 17 is used for converting the current analog signal processed by the signal conditioning circuit 16 into a digital signal and transmitting the digital signal to the main controller 9 for processing. The control circuit further comprises a radio frequency module 18 for communicating with external devices via the series compensation capacitance means and for implementing a remote control function.
In order to enable those skilled in the art to clearly understand the working principle of the series compensation capacitor device based on the intelligent self-driving of the short-circuit fault current, the following description will be made with reference to fig. 1-2.
For a line with a smaller rated current, referring to fig. 1, taking the voltage limiting device 4 as an example of a bidirectional power electronic switch, the protection process of the series compensation capacitor 7 is as follows:
current detection TC8 detects current i in the line 1 When exceeding the setting value, i.e. reaching the fault current range, the main controller 9 sends a high level on signal d 1 (drive signal) to the drive circuit 10, the drive circuit 10 injects a trigger current into the gates of the power electronic on-off control switch 2 and the bidirectional power electronic switch, and triggers them. Firstly, the bi-directional power electronic switch immediately bypasses the series compensation capacitor 7, avoiding that a fault current flows through the series compensation capacitor 7. Then, the power electronic on-off control switch 2 is turned on, and the electrostatic repulsive force coil 122 in the electromagnetic repulsive force mechanism 12 is always turned onWhen the circuit where the movable repulsive force coil 121 is conducted, an induced current is generated on the movable repulsive force coil 121, an electromagnetic repulsive force is generated between the two coils, the movable repulsive force coil 121 drives a contact in the vacuum arc extinguishing portion 11 to be closed under the action of the electromagnetic force, the static repulsive force coil 122 continuously flows through fault current, and an electromagnetic repulsive force continuously exists between the static repulsive force coil 122 and the movable repulsive force coil 121, so that the vacuum arc extinguishing portion 11 is kept in a closed state, and the series compensation capacitor 7 and the voltage limiting device 4 are protected.
When the short-circuit fault current is turned on or the short-circuit fault disappears by the circuit breaker at the power supply side of the power transmission line, the main controller 9 sends a low-level signal to the driving circuit 10, the driving circuit 10 does not inject trigger current into the gates of the power electronic on-off control switch 2 and the bidirectional power electronic switch, the bidirectional power electronic switch and the power electronic on-off control switch 2 are in an off state, at the moment, the movable repulsive force coil 121 is opened, no electromagnetic repulsive force is generated between the two repulsive force coils any more, the movable contact in the vacuum arc extinguishing part 11 is separated from the fixed contact under the action of the elasticity of the opening holding spring 123, the current flows through the series compensation capacitor 7 again, and the line is restored to the normal running state.
Wherein the roles of the reactor 5 and the resistor 6 further include: after the fast switch 3 bypasses the series compensation capacitor 7, the series compensation capacitor 7 discharges through the contacts of the voltage limiting device 4 and the vacuum arc extinguishing part 11, if the excessive current flows during discharging, the contacts of the voltage limiting device 4 and the vacuum arc extinguishing part 11 may be damaged, and meanwhile, the series compensation capacitor 7 is not allowed to discharge with the excessive current. Therefore, it is necessary to connect a reactor 5 having a small inductance value in series with the discharge circuit of the series compensation capacitor 7 to limit the discharge current of the series compensation capacitor 7. Wherein the resistor 6 may be used to dissipate the energy released by the series compensation capacitor 7 to avoid continuous oscillation of the series compensation capacitor 7 and the reactor 5.
For the circuit with larger rated current, taking the voltage limiting device 4 as an example of a bidirectional power electronic switch, the protection process of the series compensation capacitor 7 is different from the protection process of the series compensation capacitor 7 in fig. 1, specifically as follows:
when the circuit works normally, the main control circuit is activated, and the main controller9 transmitting high-level on signal d 1 (drive signal) to the drive circuit 10, the drive circuit 10 does not inject trigger current into the gate of the power electronic on-off control switch 2 at this time, the power electronic on-off control switch 2 is kept in an off state, no current flows through the dynamic repulsion coil 121 and the static repulsion coil 122 of the electromagnetic repulsion mechanism 12, and no electromagnetic repulsion is generated between the coils. Therefore, the vacuum interrupter 11 is kept in an off state at all times, and at this time, a current flows through the series compensation capacitor 7 for reducing the line equivalent reactance.
When the system has short circuit fault, the current detection TC8 detects the current i in the line 1 When reaching the setting value, i.e. the fault current range, the main controller 9 sends a low level shut-off signal d 1 (driving signal) to the driving circuit 10, the driving circuit 10 injects trigger current to the gate electrode of the power electronic on-off control switch 2 to trigger the power electronic on-off control switch 2, at this time, the loop where the dynamic repulsive force coil 121 and the static repulsive force coil 122 are located is conducted, the current passes through the dynamic repulsive force coil 121 and the static repulsive force coil 122, electromagnetic repulsive force is generated between the two coils, the dynamic repulsive force coil 121 drives the contact of the vacuum arc extinguishing part 11 to be closed under the action of electromagnetic force, and after the vacuum arc extinguishing part 11 is closed, protection of the series compensation capacitor 7 and the voltage limiting device 4 is realized.
When the rated current of the line is larger, the shunt TC13 can be used to change the current of the line into a small current, and the small current is led to the repulsive force coil in the electromagnetic repulsive force mechanism 12, so that the electromagnetic repulsive force mechanism 12 drives the moving contact and the fixed contact in the vacuum arc extinguishing portion 11 to be separated and combined, thereby achieving the effect of bypassing the series compensation capacitor 7.
When the device is put into use for the first time, the main control circuit is not activated at this time, the driving circuit 10 is not electrified, and the power electronic on-off control switch 2 is in a natural off state. At this time, if a short circuit fault exists in the circuit, the output current of the secondary side of the shunt TC13 directly flows into the repulsive force coil group of the electromagnetic repulsive force mechanism 12, electromagnetic repulsive force is generated between the moving repulsive force coil 121 and the static repulsive force coil 122, the moving repulsive force coil 121 drives the contacts of the vacuum arc extinguishing portion 11 to be closed under the action of electromagnetic force, and after the vacuum arc extinguishing portion 11 is closed, the series compensation capacitor 7 and the voltage limiting device 4 are protected.
When the voltage limiting device 4 adopts a lightning arrester such as a MOA (metal oxide arrester) lightning arrester, the drive control portion of the bidirectional power electronic switch is removed. When the line short-circuit fault current increases, the current flowing through the series compensation capacitor 7 increases, the voltage at two ends of the series compensation capacitor increases, and when the voltage of the series compensation capacitor increases to exceed the residual voltage of the lightning arrester, the lightning arrester acts to limit the voltage rise of the series compensation capacitor 7, wherein the fast switch 3 is controlled according to the method, and after the fast switch 3 is switched on, the lightning arrester and the series compensation capacitor 7 can be bypassed, so that voltage limiting protection is realized.
In summary, the series compensation capacitor device based on intelligent self-driving of short-circuit fault current can limit the voltage between the series compensation capacitors during short-circuit fault through the voltage limiting device and the fast switch, so as to realize the voltage-limiting protection of the series compensation capacitors, particularly when short-circuit fault occurs, the voltage between the series compensation capacitors can be limited through the voltage limiting device, and then the driving circuit triggers the power electronic on-off control switch to act, so that the moving repulsion coil and the static repulsion coil of the electromagnetic repulsion mechanism pass through the short-circuit fault current, electromagnetic repulsion force is generated between the two coils, the contact of the vacuum arc extinguishing part is driven to be fast closed, and the fast switch is closed, so that the series compensation capacitors are bypassed, and the voltage-limiting protection effect on the series compensation capacitors is realized. Compared with the traditional series compensation device, the device does not need to provide an external power supply, but uses short-circuit fault current to intelligently self-drive an electromagnetic repulsion mechanism to act, and compared with the traditional series compensation device, the device has no energy storage capacitor of a fast switch, and can realize repeated reclosing in a short time; in addition, the invention also provides two circuit structures, so that the circuit structure can be applied to a circuit with large rated current and a circuit with small rated current, thereby meeting the application requirements of any voltage class; the invention has the advantages of simple structure, small volume, light weight, high action speed, high reliability and good economy.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. The utility model provides a series compensation capacitance device based on short circuit fault current intelligence self-driven, its characterized in that includes inlet end, play line end, main circuit and control circuit, main circuit includes power electronics break-make control switch, fast switch, voltage limiting device, reactor, resistance and series compensation capacitance, voltage limiting device is two-way power electronics switch or arrester, power electronics break-make control switch with fast switch connects, fast switch forms first branch road after connecting in parallel with voltage limiting device, the reactor forms the second branch road after connecting in parallel with the resistance, first branch road with after the second branch road is established ties, with series compensation capacitance is respectively parallelly connected between inlet end and the outlet end; the control circuit comprises a current detection TC, a main controller and a driving circuit, wherein the main controller is respectively connected with the current detection TC and the driving circuit, and the driving circuit is connected with the power electronic on-off control switch;
the circuit is in a normal working state, the fast switch is in an off state, and normal working current passes through the series compensation capacitor from the incoming line end to the outgoing line end; when a circuit has a short circuit fault and the voltage limiting device is the bidirectional power electronic switch, and the main controller detects that the short circuit current is larger than a preset value through the current detection TC, the main controller sends a driving signal to the driving circuit so that the driving circuit drives the bidirectional power electronic switch and the power electronic on-off control switch to be conducted, and the power electronic on-off control switch is conducted so that the quick switch is in a closed state under the action of the short circuit current, thereby realizing the voltage limiting protection of the series compensation capacitor; when a short circuit fault occurs on a circuit, the voltage limiting device is the lightning arrester, and the voltages at two ends of the series compensation capacitor reach residual voltage of the lightning arrester, the lightning arrester acts to limit the voltages at two ends of the series compensation capacitor, and the main controller drives the power electronic on-off control switch to be conducted through the driving circuit, so that the fast switch is in a closed state under the action of short circuit current, and voltage limiting protection of the series compensation capacitor is achieved.
2. The intelligent self-driven series compensation capacitor device based on the short-circuit fault current according to claim 1, wherein the fast switch comprises a vacuum arc extinguishing part and an electromagnetic repulsion mechanism, and the electromagnetic repulsion mechanism is used for driving the vacuum arc extinguishing part to close or open so as to enable the fast switch to be in a closed or open state.
3. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 2, wherein when the series compensation capacitor device is applied to a line with small rated current, the electromagnetic repulsion mechanism is connected in series with the vacuum arc extinguishing part and then connected in parallel with the voltage limiting device to form the first branch, and the power electronic on-off control switch is connected with the electromagnetic repulsion mechanism.
4. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 2, wherein when the series compensation capacitor device is applied to a line with high rated current, the main circuit further comprises a shunt TC, the shunt TC is arranged at the wire inlet end and is connected with the electromagnetic repulsion mechanism through the power electronic on-off control switch, and the vacuum arc extinguishing part and the voltage limiting device are connected in parallel to form the first branch.
5. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 3, wherein the electromagnetic repulsion mechanism comprises a dynamic repulsion coil and a static repulsion coil, one end of the static repulsion coil is connected with the wire inlet end, the other end of the static repulsion coil is connected with the vacuum arc extinguishing part, and the power electronic on-off control switch is connected with the dynamic repulsion coil.
6. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 4, wherein the electromagnetic repulsion mechanism comprises a dynamic repulsion coil and a static repulsion coil, and the power electronic on-off control switch is connected with the dynamic repulsion coil and the static repulsion coil respectively.
7. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 1, further comprising an energy taking TC and a switching power supply, wherein the energy taking TC is used for taking energy from a line, converting the taken alternating current into direct current through the switching power supply, and supplying power to the main controller.
8. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 1, wherein the control circuit further comprises a signal conditioning circuit, the signal conditioning circuit is connected with the current detection TC, and the signal conditioning circuit is used for performing signal processing on the short-circuit current detected by the current detection TC.
9. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to claim 8, wherein the control circuit further comprises an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is respectively connected with the signal conditioning circuit and the main controller, and the analog-to-digital conversion circuit is used for converting signals processed by the signal conditioning circuit into digital signals and transmitting the digital signals to the main controller.
10. The intelligent self-driven series compensation capacitor device based on short-circuit fault current according to any one of claims 1-9, wherein the control circuit further comprises a wireless radio frequency module, and the wireless radio frequency module is used for communicating with an external device to realize a remote control function.
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