CN214900081U - Controllable current source ice melting device - Google Patents
Controllable current source ice melting device Download PDFInfo
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- CN214900081U CN214900081U CN202121034771.4U CN202121034771U CN214900081U CN 214900081 U CN214900081 U CN 214900081U CN 202121034771 U CN202121034771 U CN 202121034771U CN 214900081 U CN214900081 U CN 214900081U
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- 238000002955 isolation Methods 0.000 claims abstract description 27
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Abstract
The application discloses controllable current source ice-melt device specifically includes: the direct current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are connected through a first isolation knife switch; the direct current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected through a second isolation knife switch; the alternating current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are both connected with an alternating current power supply; the alternating current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected with the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit through the disconnecting link group; and a plurality of isolation disconnecting links are respectively arranged on the first-phase ice melting circuit, the second-phase ice melting circuit and the third-phase ice melting circuit and are used for controlling the on-off of the circuits. The method and the device solve the technical problems that the existing ice melting technology is poor in controllability, complex in ice melting operation and limited in application occasions, and therefore the ice melting efficiency is low.
Description
Technical Field
The application relates to the technical field of power transmission line ice melting, in particular to a controllable current source ice melting device.
Background
Among various natural disasters suffered by an electric power system, ice disaster is one of the most serious threats, ice coating damages electric power equipment and interrupts power supply, uncontrollable ice shedding enlarges the disasters, and the ice coating causes large-area paralysis of domestic and foreign electric grids for many times. With the continuous improvement of the modernization level, the dependence degree of the whole society on electric power is higher and higher, and higher requirements on electric power supply are also put forward. In recent years, various global meteorological disasters are more frequent, extreme weather and climate events are more abnormal, the loss and the influence of an electric power system caused by ice disasters are more serious, the damage degree is stronger and more complex, the coping difficulty is higher and more, and timely, quick, controllable and safe deicing means are urgently needed for a power grid.
The biggest influence of ice coating on the lines of the power system is equipment damage and power supply and communication interruption, which further causes large-area power failure and difficulty in power restoration. The existing deicing technology has poor controllability, troublesome ice melting operation for three-phase wires, limited application occasions and low actual ice melting process efficiency.
SUMMERY OF THE UTILITY MODEL
The application provides a controllable current source ice melting device which is used for solving the technical problems that the existing ice melting technology is poor in controllability, complex in ice melting operation and limited in application occasions, and therefore ice melting efficiency is low.
In view of the above, a first aspect of the present application provides a controllable current source ice melting apparatus, including: the device comprises a first three-phase six-bridge arm structure assembly, a second three-phase six-bridge arm structure assembly and a three-phase ice melting circuit;
the first three-phase six-bridge arm structure assembly comprises a first voltage source type converter valve group and a second voltage source type converter valve group, the second three-phase six-bridge arm structure assembly comprises a third voltage source type converter valve group and a fourth voltage source type converter valve group, and the three-phase ice melting circuit comprises a first-phase ice melting circuit, a second-phase ice melting circuit and a third-phase ice melting circuit;
the direct current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are connected through a first isolation knife switch;
the direct current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected through a second isolation knife switch;
the alternating current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are both connected with an alternating current power supply;
the alternating current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected with the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit through a disconnecting link group;
and a plurality of isolation disconnecting links are respectively arranged on the first-phase ice melting circuit, the second-phase ice melting circuit and the third-phase ice melting circuit and used for controlling the on-off of the circuits.
Optionally, the alternating current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected to a plurality of buses of the transformer substation.
Optionally, the dc sides of the first voltage source type converter valve group, the second voltage source type converter valve group, the third voltage source type converter valve group and the fourth voltage source type converter valve group are connected to the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit.
Optionally, the first voltage source converter valve group, the second voltage source converter valve group, the third voltage source converter valve group and the fourth voltage source converter valve group all include three voltage source converter valves.
Optionally, each voltage source converter valve includes an inductor and at least one single-phase full-bridge converter;
the inductor is connected with the single-phase full-bridge converter in series.
Optionally, the single-phase full-bridge converter includes a preset fully-controlled device and a capacitor device.
Optionally, the output ends of the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit are in short circuit in pairs through short circuit switches.
According to the technical scheme, the embodiment of the application has the following advantages:
in this application, a controllable current source ice melting device is provided, including: the device comprises a first three-phase six-bridge arm structure assembly, a second three-phase six-bridge arm structure assembly and a three-phase ice melting circuit; the first three-phase six-bridge-arm structure assembly comprises a first voltage source type converter valve group and a second voltage source type converter valve group, the second three-phase six-bridge-arm structure assembly comprises a third voltage source type converter valve group and a fourth voltage source type converter valve group, and the three-phase ice melting circuit comprises a first-phase ice melting circuit, a second-phase ice melting circuit and a third-phase ice melting circuit; the direct current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are connected through a first isolation knife switch; the direct current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected through a second isolation knife switch; the alternating current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are both connected with an alternating current power supply; the alternating current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected with the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit through the disconnecting link group; and a plurality of isolation disconnecting links are respectively arranged on the first-phase ice melting circuit, the second-phase ice melting circuit and the third-phase ice melting circuit and are used for controlling the on-off of the circuits.
According to the ice melting device with the controllable current source, two three-phase six-bridge-arm structural components constructed by a plurality of voltage source type converter valve groups are connected with a three-phase ice melting circuit, on-off control is performed in the circuit by adopting a disconnecting link, a complete ice melting loop can be formed through one-time regulation and control operation, and ice melting of the three-phase circuit is realized at the same time; the circuit structure is strong, and the operation is simple; different loops can be formed according to the control of various disconnecting links to complete the ice melting task of different lines, the universality is high, and the method can be applied to various scenes. Therefore, the technical problems that the controllability is poor, the ice melting operation is complicated, the application occasions are limited, and the ice melting efficiency is low in the conventional ice melting technology can be solved.
Drawings
Fig. 1 is a schematic structural diagram of a controllable current source ice melting device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an operation loop of a three-phase wire ice melting process provided by an embodiment of the present application;
fig. 3 is a schematic structural diagram of a power flow regulating circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of two dc ice melting devices connected in parallel according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of four static synchronous compensation devices according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an operation loop of another DC ice melting apparatus according to an embodiment of the present application;
fig. 7 is a schematic diagram of a loop for deicing an overhead ground wire or an optical fiber composite ground wire (OPGW) according to an embodiment of the present application;
fig. 8 is a schematic circuit diagram of a single fully-controlled device according to an embodiment of the present application
Fig. 9 is a schematic circuit diagram of a parallel connection of dual fully-controlled devices according to an embodiment of the present disclosure;
fig. 10 is a schematic circuit diagram of a parallel connection of multiple fully-controlled devices according to an embodiment of the present disclosure;
reference numerals:
a first three-phase six-leg structural assembly 1; a first voltage source type converter valve group 11; a second voltage source type converter valve group 12; a second three-phase six-leg structural assembly 2; a third voltage source type converter valve group 21; a fourth voltage source type converter valve group 22; a three-phase ice melting circuit 3; a first phase ice-melting circuit 31; a second phase ice melting circuit 32; a third phase ice melting circuit 33.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The existing power grid controllable ice melting device has the operation characteristic of a controllable direct current source, at least two steps of operations are needed for melting ice on three-phase wires of an alternating current transmission line, the first step is to remove ice on two-phase wires in a one-to-one phase mode, namely a wiring mode that the two-phase wires are connected in series to form a direct current loop; and the second step is to remove the ice coated on the other phase of the wire by adopting a 'relative two-phase' mode, namely, the two phases of the wire are connected in series with the third phase of the wire after the ice melting is finished to form a direct current loop connection mode. Obviously, the three-phase wire can be completed by two steps, and the efficiency is low. The controllable current source ice melting device provided by the application can simultaneously melt ice of the three-phase electric wire by only one operation.
For easy understanding, please refer to fig. 1, an embodiment of a controllable current source ice melting apparatus provided in the present application includes: the device comprises a first three-phase six-bridge arm structure component 1, a second three-phase six-bridge arm structure component 2 and a three-phase ice melting circuit 3.
The first three-phase six-bridge arm structure component 1 comprises a first voltage source type converter valve group 11 and a second voltage source type converter valve group 12, the second three-phase six-bridge arm structure component 2 comprises a third voltage source type converter valve group 21 and a fourth voltage source type converter valve group 22, and the three-phase ice melting circuit 3 comprises a first-phase ice melting circuit 31, a second-phase ice melting circuit 32 and a third-phase ice melting circuit 33;
the direct current sides of the first voltage source type converter valve group 11 and the third voltage source type converter valve group 21 are connected through a first isolation knife switch S10;
the dc sides of the second voltage source converter valve group 12 and the fourth voltage source converter valve group 22 are connected through a second isolation switch S11;
the alternating current sides of the first voltage source type converter valve group 11 and the third voltage source type converter valve group 21 are both connected with an alternating current power supply;
the alternating current sides of the second voltage source type converter valve group 12 and the fourth voltage source type converter valve group 22 are connected with the first phase ice melting circuit 31, the second phase ice melting circuit 32 and the third phase ice melting circuit 33 through a disconnecting link group;
and a plurality of isolation disconnecting links are respectively arranged on the first-phase ice melting circuit 31, the second-phase ice melting circuit 32 and the third-phase ice melting circuit 33 and are used for controlling the on-off of the circuits.
Referring to fig. 1, the plurality of isolation switches on the three-phase ice melting circuit 3 are S1, S2, S3, S4, Sa, Sb, Sc, Sab, Sbc, etc., and different loops can be formed by selecting on/off of different switches.
The knife switch group comprises S1-S9, the knife switches S2, S3, S8 and S9 are disconnected, the knife switches S1, S4, S5, S6 and S7 are connected, the circuit is connected with an alternating current power supply, a variable-frequency controllable current source ice melting circuit can be formed, ice melting is carried out on the power transmission line of the three-phase ice melting circuit 3, and a specific variable-frequency controllable current source ice melting loop is shown in figure 2. The frequency of the output current of the ice melting power supply can be adjusted within the range of 0-50/3Hz, and can be specifically adjusted according to an ice melting line and an actual scene.
It can be understood that the switches Sa, Sb, Sc, Sab, and Sbc in the three-phase ice-melting loop are generally in a closed state when the circuit performs ice melting, so that a path is formed to melt the three-phase line conveniently.
According to the ice melting device with the controllable current source, two three-phase six-bridge arm structural components constructed by a plurality of voltage source type converter valve groups are connected with a three-phase ice melting circuit, on-off control is performed in the circuit by adopting a disconnecting link, a complete ice melting loop can be formed through one-time regulation and control operation, and ice melting of the three-phase circuit is realized at the same time; the circuit structure is strong, and the operation is simple; different loops can be formed according to the control of various disconnecting links to complete the ice melting task of different lines, the universality is high, and the method can be applied to various scenes. Therefore, the technical problems that the existing ice melting technology is poor in controllability, tedious in ice melting operation and limited in application occasions, and ice melting efficiency is low can be solved.
Further, the ac sides of the second voltage source converter valve group 12 and the fourth voltage source converter valve group 22 are connected to a plurality of busbars of the substation.
Further, the direct current sides of the first voltage source type converter valve group 11, the second voltage source type converter valve group 12, the third voltage source type converter valve group 21 and the fourth voltage source type converter valve group 22 are connected to the first phase ice melting circuit 31, the second phase ice melting circuit 32 and the third phase ice melting circuit 33.
Referring to fig. 1, a plurality of bus bars are connected to the ac side output terminals of the second voltage source converter valve set 12 and the fourth voltage source converter valve set 22 before the knife switches S5, S6 and S7, respectively.
If the first isolation switch S10 and the second isolation switch S11 are closed and all the switches of the switch group are disconnected at the same time, that is, not connected to the three-phase ice melting circuit 3, a power flow regulating system may be formed for regulating the operation of the power system and improving the operation efficiency of the power system, please refer to fig. 3 specifically.
If the first isolation knife switch S10 and the second isolation knife switch S11 are closed at this time, the knife switches S1, S3, S4, S8 and S9 are closed, and the knife switches S2, S5, S6 and S7 are opened, a system with two parallel direct-current ice melting devices can be formed, please refer to fig. 4, direct-current ice melting is performed on three-phase wires at the same time, and the current of an input circuit needs to be set and adjusted according to the power transmission line for ice melting.
If the first isolation switch S10 and the second isolation switch S11 are disconnected at this time, and all switches of the switch group are disconnected at the same time, that is, not connected to the three-phase ice melting circuit 3, a system including four static synchronous compensation devices can be directly formed, please refer to fig. 5. The ice melting device can be used for melting ice only in the icing period of each year, if the ice melting device can operate in a mode of a static synchronous compensation device in the non-icing period, the utilization rate of equipment can be obviously improved, the reactive power regulation and dynamic reactive power support capability of a transformer substation where the ice melting device is located can be improved, and the availability of the ice melting device in the icing period can be ensured.
If the first isolation knife switch S10 and the second isolation knife switch S11 are disconnected at this time, the knife switches S1, S3, S4, S8 and S9 are closed, and the knife switches S2, S5, S6 and S7 are disconnected, a three-phase lead dc deicing system can be formed, please refer to fig. 6, dc deicing is performed on the three-phase lead at the same time, the current of the input circuit needs to be set and adjusted according to the power transmission line for deicing, and at this time, the other side valve bank is a static synchronous compensation device. When the disconnecting links S8 and S9 are further disconnected, two static synchronous compensator apparatuses can be formed.
If the first isolation knife switch S10 and the second isolation knife switch S11 are opened at this time, the knife switches S1, S4, S8 and S9 are closed at the same time, the knife switches S2, S3, S5, S6 and S7 are opened, the short-circuit knife switch Sab between the first ice-melting circuit 31 and the second ice-melting circuit 32 and the short-circuit knife switch Sbc between the second ice-melting circuit 32 and the third ice-melting circuit 33 are opened, and the short-circuit knife switches Sg1 and Sg2 between the first ice-melting circuit 31 and the third ice-melting circuit 33 are closed. An ice melting device for melting ice on an overhead ground wire or an optical fiber composite ground wire (OPGW) through two-phase conductors can be formed, please refer to fig. 7. At the moment, ice melting is carried out on an overhead ground wire or an optical fiber composite ground wire (OPGW), and the ice melting current can be selected according to actual conditions. If the disconnecting links S1 and S4 are further disconnected, two static synchronous compensation devices can be obtained.
Further, each of the first voltage source converter valve group 11, the second voltage source converter valve group 12, the third voltage source converter valve group 21, and the fourth voltage source converter valve group 22 includes three voltage source converter valves (SM1 … SMn).
Referring to fig. 1, a first voltage source type converter valve set 11 and a second voltage source type converter valve set 12 are mainly connected to an ac power supply, and a third voltage source type converter valve set 21 and a fourth voltage source type converter valve set 22 are mainly connected to a three-phase ice melting circuit 3; each phase of the alternating current power supply is connected with two voltage source type converter valves.
Further, each voltage source converter valve (SM1 … SMn) comprises an inductor and at least one single-phase full-bridge converter; the inductor is connected in series with the single-phase full-bridge converter.
Further, the single-phase full-bridge current converter comprises a preset full-control type device and a capacitor device.
It should be noted that the inductor is installed at the input phase end of the near-ac power supply, and is connected in series with the single-phase full-bridge converter and then connected with the output phase to the single-phase ice melting circuit. Each pre-set fully controlled device includes an anti-parallel diode.
The preset full-control device can adopt a single full-control device, and the specific structure is shown in fig. 8; besides a single fully-controlled device, a double fully-controlled device can be connected in parallel, and the specific structure is shown in fig. 9; in addition, a plurality of fully-controlled devices can be connected in parallel, and the specific structure is shown in fig. 10.
Further, the output ends of the first phase ice-melting circuit 31, the second phase ice-melting circuit 32 and the third phase ice-melting circuit 33 are shorted in pairs by short-circuit knife switches.
Referring to fig. 1, the output ends of the three single-phase ice-melting circuits are short-circuited through the isolation knife-switch, specifically, the lines where Sab and Sbc are located are circuits where every two of the three phases are short-circuited, and when the ice-melting operation is performed on the conducting wire, the short-circuit lines where Sg1 and Sg2 are located are in a disconnected state, so that the three-phase ice-melting circuit 3 is connected to form an ice-melting loop; when the ice melting is carried out on the overhead ground wire and the optical fiber composite ground wire (OPGW), the short-circuit wires of the Sg1 and the Sg2 are required to be in a connected state, and the Sab and the Sbc are required to be in a disconnected state.
It can be found that the controllable current source ice melting device provided by the embodiment of the application can meet the ice melting requirements of various different power transmission and distribution lines, can better ensure the electric energy quality in the operating condition, and hardly has influence on an alternating current system. The preset full-control device is utilized to meet the requirement of the transmission line ground wire ice melting for large variation range of current, so that the controllable current source ice melting device can be used for the ice melting of various ground wires.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. A controllable current source ice melting apparatus, comprising: the device comprises a first three-phase six-bridge arm structure assembly, a second three-phase six-bridge arm structure assembly and a three-phase ice melting circuit;
the first three-phase six-bridge arm structure assembly comprises a first voltage source type converter valve group and a second voltage source type converter valve group, the second three-phase six-bridge arm structure assembly comprises a third voltage source type converter valve group and a fourth voltage source type converter valve group, and the three-phase ice melting circuit comprises a first-phase ice melting circuit, a second-phase ice melting circuit and a third-phase ice melting circuit;
the direct current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are connected through a first isolation knife switch;
the direct current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected through a second isolation knife switch;
the alternating current sides of the first voltage source type converter valve group and the third voltage source type converter valve group are both connected with an alternating current power supply;
the alternating current sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected with the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit through a disconnecting link group;
and a plurality of isolation disconnecting links are respectively arranged on the first-phase ice melting circuit, the second-phase ice melting circuit and the third-phase ice melting circuit and used for controlling the on-off of the circuits.
2. The controllable current source ice melting device according to claim 1, wherein the ac sides of the second voltage source type converter valve group and the fourth voltage source type converter valve group are connected to a plurality of busbars of a transformer substation.
3. The controllable current source ice melting device according to claim 1, wherein dc sides of the first voltage source type converter valve group, the second voltage source type converter valve group, the third voltage source type converter valve group, and the fourth voltage source type converter valve group are connected to the first phase ice melting circuit, the second phase ice melting circuit, and the third phase ice melting circuit.
4. The controllable current source ice melting device according to claim 1, wherein the first voltage source converter valve group, the second voltage source converter valve group, the third voltage source converter valve group, and the fourth voltage source converter valve group each include three voltage source converter valves.
5. The controllable current source ice melting apparatus according to claim 4, wherein each of said voltage source converter valves comprises an inductor and at least one single-phase full bridge converter;
the inductor is connected with the single-phase full-bridge converter in series.
6. The controllable current source ice melting apparatus of claim 5, wherein said single phase full bridge inverter comprises a pre-set fully controlled device and a capacitor device.
7. The controllable current source ice melting device according to claim 1, wherein the output terminals of the first phase ice melting circuit, the second phase ice melting circuit and the third phase ice melting circuit are shorted in pairs by short circuit switches.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113131429A (en) * | 2021-05-14 | 2021-07-16 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113131429A (en) * | 2021-05-14 | 2021-07-16 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting device |
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