CN211239260U - System for deicing overhead line by using photovoltaic power generation - Google Patents
System for deicing overhead line by using photovoltaic power generation Download PDFInfo
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- CN211239260U CN211239260U CN201922432404.9U CN201922432404U CN211239260U CN 211239260 U CN211239260 U CN 211239260U CN 201922432404 U CN201922432404 U CN 201922432404U CN 211239260 U CN211239260 U CN 211239260U
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Abstract
A system for deicing an overhead line by using photovoltaic power generation comprises a photovoltaic power generation unit, a direct current bus bar for receiving the power energy generated by the photovoltaic power generation unit, a direct current deicing system connected with the direct current bus bar, an electric overhead conductor connected with the direct current deicing system, and a deicing short-circuit knife switch installed at the tail end of the electric overhead conductor; the photovoltaic power generation system generates power through solar energy and transmits direct current to a direct current bus bar, the direct current ice melting system transmits the direct current on the direct current bus bar to an electric overhead conductor through connecting the direct current bus bar, and the direct current flows into the ground through an iced overhead conductor and an ice melting short-circuit knife switch; the resistance on the overhead conductor generates heat when current flows through the resistance, so that ice on the conductor is slowly melted and falls off under the action of gravity, and the purpose of melting ice is achieved. And under the condition that the overhead conductor is not frozen, the energy generated by the photovoltaic power generation unit is transmitted to the power grid through the overhead line through the inverter.
Description
Technical Field
The utility model belongs to the technical field of the new forms of energy utilization, concretely relates to use photovoltaic power generation to carry out system of overhead line ice-melt.
Background
Snow and ice disasters often pose great threats to the safety of a power system, and the icing of an overhead transmission line is a common expression form. Icing of an overhead transmission line is an important factor of dangerous events such as transmission line fracture, power transmission tower collapse and the like.
Along with the improvement of the awareness of the icing damage of the power transmission line at home and abroad, various ice melting methods appear. At present, there are more than 30 kinds of ice melting methods at home and abroad, which can be roughly divided into three types of mechanical ice melting methods, natural ice melting methods and thermal ice melting methods. At home and abroad, the direct-current ice melting method in the wire thermal ice melting method is considered to be the most effective for the ice coating problem of the power transmission line in a large range.
A direct current ice melting method: the principle of the direct-current ice melting technology is that an ice coating line is used as a load, a direct-current power supply is applied, and short-circuit current is provided by using lower voltage to heat a wire so as to melt the ice coating. The high-voltage alternating current can be converted into a direct current power supply by adopting two schemes of generator power supply rectification and silicon controlled rectifier rectification of a system power supply, and the lead is heated by short-circuit current so as to heat the lead and melt ice on the power transmission line, thereby avoiding the phenomenon that the line falls and breaks due to icing.
According to the scheme, the photovoltaic power generation assembly is used as a power generation power supply, the photovoltaic power generation assembly normally generates power and is connected to a power grid through the inverter when the photovoltaic power generation assembly normally works, the power generated by the photovoltaic power generation assembly is connected to the direct current bus bar under the condition that a power transmission line is iced seriously, and ice melting is carried out under the control of the direct current ice melting system.
Disclosure of Invention
The utility model aims at providing an use photovoltaic power generation to carry out system of overhead line ice-melt, the utility model discloses a photovoltaic power generation subassembly inserts the direct current busbar that converges as the power generation power supply with the electricity generation, carries out the ice-melt to air wire through the control of direct current ice-melt system, and in the period that air wire does not freeze, photovoltaic module normally generates electricity, and the electric quantity is through dc-to-ac converter input electric wire netting.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a system for use photovoltaic power generation carries out ice-melt of overhead line, includes a plurality of photovoltaic power generation unit 1, the direct current busbar 2 that is connected with a plurality of photovoltaic power generation unit 1, the direct current ice-melt system 3 of connecting direct current busbar 2, the electric power overhead conductor 5 of connecting direct current ice-melt system 3, connect direct current busbar 2 and electric power overhead conductor 5's photovoltaic inverter 4 when electric power overhead conductor 5 is not iced the state.
In the system for deicing the overhead line by using photovoltaic power generation, when the overhead conductor 5 is not frozen, direct current generated by the photovoltaic power generation unit 1 is transmitted to the direct current bus bar 2, converted into alternating current by the photovoltaic inverter 4 and transmitted to the power grid 6 through the non-frozen electric overhead conductor 5; when the electric overhead conductor 5 is in an icing state, direct current generated by the photovoltaic power generation unit 1 is transmitted to the direct current bus bar 2, the direct current bus bar 2 is connected with the electric overhead conductor 5 through the direct current ice melting system 3, and electric energy is controlled by the direct current ice melting system 4, so that current flows through the electric overhead conductor 5, heat is generated through a resistor, ice on the electric overhead conductor 5 is melted, and the electric overhead conductor falls under the action of gravity, and the purpose of ice melting is achieved.
The direct-current ice melting system 3 comprises ice melting side equipment arranged at the starting end of the electric overhead conductor and short-circuit side equipment arranged at the tail end of the electric overhead conductor; the ice melting side equipment of the direct current ice melting system 3 comprises a positive electrode connector 31 and a negative electrode connector 32 which are connected with the direct current bus bar 2, a phase selection disconnecting link A +331, a phase selection disconnecting link B +332, a phase selection disconnecting link C +333 which are connected with the positive electrode connector 31, and a phase selection disconnecting link A-341, a phase selection disconnecting link B-342 and a phase selection disconnecting link C-343 which are connected with the negative electrode connector 32; the other ends of the phase selection knife switch A +331 and the phase selection knife switch A-341 are connected with a direct-current ice melting bus A351; the other ends of the phase selection knife switch B +332 and the phase selection knife switch B-342 are connected with a direct-current ice melting bus B352; the other ends of the phase selection knife switch C +333 and the phase selection knife switch C-343 are connected with a direct-current ice melting bus C353; one end of the ice melting switch A361 is connected with the direct-current ice melting bus A351, and the other end is connected with the 5A phase of the electric overhead conductor; one end of the ice melting switch B362 is connected with the DC ice melting bus B352, and the other end is connected with the 5B phase of the power overhead conductor; one end of the ice melting switch C363 is connected with the direct-current ice melting bus C353, and the other end of the ice melting switch C363 is connected with the 5C phase of the power overhead conductor; the short-circuit side equipment of the direct-current ice melting system 3 comprises an ice melting short-circuit disconnecting link AB37 which is connected with the tail end of the phase A of the overhead conductor 5 and the tail end of the phase B of the power overhead conductor 5, and an ice melting short-circuit disconnecting link BC 38 which is connected with the tail end of the phase B of the power overhead conductor 5 and the tail end of the phase C of the power overhead conductor 5;
and the phase selection knife switch A +331, the phase selection knife switch B +332, the phase selection knife switch C +333, the phase selection knife switch A-341, the phase selection knife switch B-342, the phase selection knife switch C-343, the ice melting switch A361, the ice melting switch B362, the ice melting switch C363, the ice melting short-circuit knife switch AB37 and the ice melting short-circuit knife switch BC 38 can be electrically controlled or directly manually controlled by the direct current ice melting controller 39.
According to the working method of the system for deicing the overhead line by using the photovoltaic power generation, two-phase series deicing or two-phase parallel connection and one-phase series deicing are selected according to the icing thickness condition;
under the two-phase series mode, three modes of two phases of an electric overhead conductor 5AB, two phases of an electric overhead conductor 5BC and two phases of an electric overhead conductor 5AC are selected; if the two phases of the power overhead conductor 5AB are connected in series, the operation process is as follows: the photovoltaic inverter 4 is disconnected, the ice melting short-circuit knife switch AB37 is closed, the phase selection knife switch A +331 is closed to charge the direct-current ice melting bus A351, the phase selection knife switch B-342 is closed to charge the direct-current ice melting bus B352, the ice melting switch A361 and the ice melting switch B362 are closed to melt ice on the phase 5A of the power overhead conductor after charging is completed, and the phase B is melted; the other two series modes operate in the same process;
under the two-phase parallel one-phase series connection ice melting mode, connecting two phases of an electric overhead conductor 5AB in parallel and then connecting the phases in series with an electric overhead conductor 5C, or connecting two phases of an electric overhead conductor 5BC in parallel and then connecting the phases in series with an electric overhead conductor 5A; if the two phases of the overhead power conductor 5AB are connected in parallel and then connected in series with the 5C phase of the overhead power conductor, the operation process is as follows: firstly, the photovoltaic inverter 4 is disconnected, then the ice-melting short-circuit knife switch AB37 and the ice-melting short-circuit knife switch BC 38 are closed at the same time, the phase selection knife switch A +331 is closed to charge the direct-current ice-melting bus A351, the phase selection knife switch B +332 is closed to charge the direct-current ice-melting bus B352, the phase selection knife switch C-343 is closed to charge the direct-current ice-melting bus C353, and after the charging is finished, the ice-melting switch A361, the ice-melting switch B362 and the ice-melting switch C363 are closed to melt ice on the 5A phase, the B phase and the C phase of; the operation process of the two phases of the power overhead conductor 5BC connected in parallel and then connected in series with the power overhead conductor 5A phase is the same.
Compared with the prior art, the utility model discloses possess following advantage:
1. the utility model discloses use photovoltaic power generation as ice-melt power supply, photovoltaic power generation is renewable clean energy, and is pollution-free to the environment.
2. The equipment of the existing direct current ice melting system mainly comprises a transformer, a rectifier, an alternating current filter, a converter valve and the like, the investment is large, the working time of an ice melting device is short, and the ice melting device is singly used for melting ice, so that the idle waste of equipment resources is caused. And the utility model discloses use the photovoltaic power generation subassembly as DC power supply, the normal electricity generation of normal during operation photovoltaic module acquires the charges of electricity income, and the construction cost has been saved for ice-melt power supply to the adjustment when the circuit freezes.
3. The photovoltaic power generation ice melting system converts solar energy into electric energy through the photovoltaic module, electricity is not required to be purchased from a power grid, and ice melting cost is saved.
Drawings
Fig. 1 is the utility model discloses use photovoltaic power generation to carry out the system block diagram of overhead line ice-melt.
Fig. 2 is a schematic structural diagram of a direct-current deicing system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model relates to a system for use photovoltaic power generation to carry out ice-melt of overhead line, including a plurality of photovoltaic power generation unit 1, the direct current busbar 2 of converging with a plurality of photovoltaic power generation unit 1 connections connects direct current and converges direct current ice-melt system 3 of busbar 2, connects direct current ice-melt system 3's electric power air wire 5, connects direct current busbar 2 and electric power air wire 5's photovoltaic inverter 4 when electric power air wire 5 is not frozen the state.
In the system for deicing the overhead line by using photovoltaic power generation, when the overhead conductor 5 is not frozen, direct current generated by the photovoltaic power generation unit 1 is transmitted to the direct current bus bar 2, converted into alternating current by the photovoltaic inverter 4 and transmitted to the power grid 6 through the non-frozen electric overhead conductor 5; when the electric overhead conductor 5 is in an icing state, direct current generated by the photovoltaic power generation unit 1 is transmitted to the direct current bus bar 2, the direct current bus bar 2 is connected with the electric overhead conductor 5 through the direct current ice melting system 3, and electric energy is controlled by the direct current ice melting system 4, so that current flows through the electric overhead conductor 5, heat is generated through a resistor, ice on the electric overhead conductor 5 is melted, and the electric overhead conductor falls under the action of gravity, and the purpose of ice melting is achieved.
As shown in fig. 2, the direct-current deicing system 3 includes a deicing-side device configured at the beginning of the power overhead conductor and a short-circuit-side device configured at the end of the power overhead conductor; the ice melting side equipment of the direct current ice melting system 3 comprises a positive electrode connector 31 and a negative electrode connector 32 which are connected with the direct current bus bar 2, a phase selection disconnecting link A +331, a phase selection disconnecting link B +332, a phase selection disconnecting link C +333 which are connected with the positive electrode connector 31, and a phase selection disconnecting link A-341, a phase selection disconnecting link B-342 and a phase selection disconnecting link C-343 which are connected with the negative electrode connector 32; the other ends of the phase selection knife switch A +331 and the phase selection knife switch A-341 are connected with a direct-current ice melting bus A351; the other ends of the phase selection knife switch B +332 and the phase selection knife switch B-342 are connected with a direct-current ice melting bus B352; the other ends of the phase selection knife switch C +333 and the phase selection knife switch C-343 are connected with a direct-current ice melting bus C353; one end of the ice melting switch A361 is connected with the direct-current ice melting bus A351, and the other end is connected with the 5A phase of the electric overhead conductor; one end of the ice melting switch B362 is connected with the DC ice melting bus B352, and the other end is connected with the 5B phase of the power overhead conductor; one end of the ice melting switch C363 is connected with the direct-current ice melting bus C353, and the other end of the ice melting switch C363 is connected with the 5C phase of the power overhead conductor; the short-circuit side equipment of the direct-current ice melting system 3 comprises an ice melting short-circuit disconnecting link AB37 which is connected with the tail end of the phase A of the overhead conductor 5 and the tail end of the phase B of the power overhead conductor 5, and an ice melting short-circuit disconnecting link BC 38 which is connected with the tail end of the phase B of the power overhead conductor 5 and the tail end of the phase C of the power overhead conductor 5;
and the phase selection knife switch A +331, the phase selection knife switch B +332, the phase selection knife switch C +333, the phase selection knife switch A-341, the phase selection knife switch B-342, the phase selection knife switch C-343, the ice melting switch A361, the ice melting switch B362, the ice melting switch C363, the ice melting short-circuit knife switch AB37 and the ice melting short-circuit knife switch BC 38 can be electrically controlled or directly manually controlled by the direct current ice melting controller 39.
As shown in fig. 1 and 2, the utility model discloses a working method of a system for ice melting of overhead lines by using photovoltaic power generation, two-phase series ice melting or two-phase parallel one-phase series ice melting is selected according to the icing thickness condition;
under the two-phase series mode, three modes of two phases of an electric overhead conductor 5AB, two phases of an electric overhead conductor 5BC and two phases of an electric overhead conductor 5AC are selected; if the two phases of the power overhead conductor 5AB are connected in series, the operation process is as follows: the photovoltaic inverter 4 is disconnected, the ice melting short-circuit knife switch AB37 is closed, the phase selection knife switch A +331 is closed to charge the direct-current ice melting bus A351, the phase selection knife switch B-342 is closed to charge the direct-current ice melting bus B352, the ice melting switch A361 and the ice melting switch B362 are closed to melt ice on the phase 5A of the power overhead conductor after charging is completed, and the phase B is melted; the other two series modes operate in the same process;
under the two-phase parallel one-phase series connection ice melting mode, connecting two phases of an electric overhead conductor 5AB in parallel and then connecting the phases in series with an electric overhead conductor 5C, or connecting two phases of an electric overhead conductor 5BC in parallel and then connecting the phases in series with an electric overhead conductor 5A; if the two phases of the overhead power conductor 5AB are connected in parallel and then connected in series with the 5C phase of the overhead power conductor, the operation process is as follows: firstly, the photovoltaic inverter 4 is disconnected, then the ice-melting short-circuit knife switch AB37 and the ice-melting short-circuit knife switch BC 38 are closed at the same time, the phase selection knife switch A +331 is closed to charge the direct-current ice-melting bus A351, the phase selection knife switch B +332 is closed to charge the direct-current ice-melting bus B352, the phase selection knife switch C-343 is closed to charge the direct-current ice-melting bus C353, and after the charging is finished, the ice-melting switch A361, the ice-melting switch B362 and the ice-melting switch C363 are closed to melt ice on the 5A phase, the B phase and the C phase of; the operation process of the two phases of the power overhead conductor 5BC connected in parallel and then connected in series with the power overhead conductor 5A phase is the same.
Claims (2)
1. A system for deicing an overhead line by using photovoltaic power generation is characterized in that: the direct current ice melting system comprises a plurality of photovoltaic power generation units (1), a direct current bus bar (2) connected with the photovoltaic power generation units (1), a direct current ice melting system (3) connected with the direct current bus bar (2), an electric overhead conductor (5) connected with the direct current ice melting system (3), and a photovoltaic inverter (4) connected with the direct current bus bar (2) and the electric overhead conductor (5) when the electric overhead conductor (5) is in an unfrozen state.
2. The system for ice melting overhead lines using photovoltaic power generation as claimed in claim 1, wherein: the direct-current ice melting system (3) comprises ice melting side equipment arranged at the starting end of the electric overhead conductor and short-circuit side equipment arranged at the tail end of the electric overhead conductor; the ice melting side equipment of the direct current ice melting system (3) comprises a positive electrode connector (31) and a negative electrode connector (32) which are connected with the direct current bus bar (2), a phase selection knife switch A + (331) connected with the positive electrode connector (31), a phase selection knife switch B + (332), a phase selection knife switch C + (333), and a phase selection knife switch A- (341), a phase selection knife switch B- (342) and a phase selection knife switch C- (343) connected with the negative electrode connector (32); the other ends of the phase selection knife switch A + (331) and the phase selection knife switch A- (341) are connected with a direct-current ice melting bus A (351); the other ends of the phase selection knife switch B + (332) and the phase selection knife switch B- (342) are connected with a direct-current ice melting bus B (352); the other ends of the phase selection knife switch C + (333) and the phase selection knife switch C- (343) are connected with a direct-current ice melting bus C (353); one end of the ice melting switch A (361) is connected with the direct-current ice melting bus A (351), and the other end of the ice melting switch A is connected with the phase A of the electric overhead conductor (5); one end of the ice melting switch B (362) is connected with the direct-current ice melting bus B (352), and the other end of the ice melting switch B is connected with the B phase of the electric overhead conductor (5); one end of the ice melting switch C (363) is connected with the direct-current ice melting bus C (353), and the other end of the ice melting switch C (363) is connected with the C phase of the electric overhead conductor (5); the short-circuit side equipment of the direct-current ice melting system (3) comprises an ice melting short-circuit disconnecting link AB (37) which is connected with the tail end of the phase A of the overhead conductor (5) and the tail end of the phase B of the electric overhead conductor (5), and an ice melting short-circuit disconnecting link BC (38) which is connected with the tail end of the phase B of the electric overhead conductor (5) and the tail end of the phase C of the electric overhead conductor (5);
and the phase selection knife switch A + (331), the phase selection knife switch B + (332), the phase selection knife switch C + (333), the phase selection knife switch A- (341), the phase selection knife switch B- (342), the phase selection knife switch C- (343), the ice melting switch A (361), the ice melting switch B (362), the ice melting switch C (363), the ice melting short-circuit knife switch AB (37) and the ice melting short-circuit knife switch BC (38) can be electrically controlled or directly manually controlled by a direct current ice melting controller (39).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922432404.9U CN211239260U (en) | 2019-12-30 | 2019-12-30 | System for deicing overhead line by using photovoltaic power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922432404.9U CN211239260U (en) | 2019-12-30 | 2019-12-30 | System for deicing overhead line by using photovoltaic power generation |
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| Publication Number | Publication Date |
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| CN211239260U true CN211239260U (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922432404.9U Active CN211239260U (en) | 2019-12-30 | 2019-12-30 | System for deicing overhead line by using photovoltaic power generation |
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| CN (1) | CN211239260U (en) |
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- 2019-12-30 CN CN201922432404.9U patent/CN211239260U/en active Active
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