CN111130046B - Ice melting loop of electrified railway overhead contact system and control method thereof - Google Patents
Ice melting loop of electrified railway overhead contact system and control method thereof Download PDFInfo
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- CN111130046B CN111130046B CN202010085686.4A CN202010085686A CN111130046B CN 111130046 B CN111130046 B CN 111130046B CN 202010085686 A CN202010085686 A CN 202010085686A CN 111130046 B CN111130046 B CN 111130046B
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- 238000002844 melting Methods 0.000 title claims abstract description 55
- 230000008018 melting Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 210000004899 c-terminal region Anatomy 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000012212 insulator Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides an ice melting loop of an electrified railway overhead contact system and a control method thereof, and relates to the technical field of electrified railway power supply. The head end of a traction bus TB provided with a voltage transformer VT is connected in parallel between a switch K1 and a switch K2 in a primary line of a matching transformer MT; the g tap of the MT secondary side of the matching transformer is connected with the a terminal of the SVG 1; the b terminal of the static var generator SVG1 is connected with a steel rail T; the power supply arm head end C1 is connected in series with a switch K3 and then connected in parallel between a g tap matched with the secondary side of the transformer MT and a connecting line of an a terminal of the static var generator SVG1, a current transformer CT is arranged between the connecting line of the power supply arm head end C1 and the K3, and the power supply arm head end C1 is connected in series with a switch K4 and is connected with a traction bus TB; the C terminal of the static var generator SVG2 is connected with a switch K5 in series and connected with the tail end C2 of the power supply arm, and the d terminal of the static var generator SVG2 is connected with a steel rail T.
Description
Technical Field
The invention relates to the technical field of electrified railway power supply.
Background
The electric railway is nationwide, and because of the complex climate conditions in the region, the situation of contact net icing exists in the south and the north.
The damage of the contact net ice coating comprises the following steps: (1) When the ice coating thickness of the contact net exceeds the ice coating limit, the problems of broken wire, broken deformation of the support column and the like can occur. (2) The wire is galloped due to uneven ice coating and ice removing on the same wire, and accidents such as broken wires or failure of parts can be caused when serious accidents occur; (3) When the overhead line is iced, part of the conductive particles are iced on the surface of the insulator string, the electric conductivity of the surface of the insulator string is obviously improved when the ice layer is melted, flashover accidents are very easy to occur, and frequent tripping of a circuit and carbonization damage of the insulator string are caused; (4) The icing of the contact line results in the contact plate and the contact line being separated by an ice layer and not being in direct contact with each other, thereby producing an arc burn contact plate and contact line. Therefore, the research of the catenary ice melting method has positive significance on the stable operation of the traction power supply system.
Currently, there are many studies on Static Var Generator (SVG) (STATIC VAR Generator) based anti-icing devices. According to the mode, the power transmission line is used as a load, a large reactive current is output through reactive compensation equipment, and the purpose of ice prevention or ice melting is achieved by utilizing Joule heat. Theoretically, SVG has fast regulation speed and wide operation range, can meet the demands of anti-icing and ice-melting under different meteorological conditions, but has larger ice-melting current and larger capacity of an ice-melting device, is limited to the voltage and current levels of the existing fully-controlled power electronic device, has difficult large-capacity compensation, and has larger equipment investment and is not economical enough.
Disclosure of Invention
The invention aims to provide an electrified railway ice melting loop and a control method thereof, which can effectively solve the technical problem that the capacity of an ice melting device is reduced.
The aim of the invention is achieved by the following technical scheme: the utility model provides an electronic railway contact net ice-melt return circuit, includes traction transformer TT, traction busbar TB and static var generator, contact net ice-melt return circuit specific structure does:
The primary side of the traction transformer TT is connected with A, B, C of a three-phase power grid, one end of the secondary side is connected with a steel rail or grounded, and the other end of the secondary side is connected with a switch K1 and a switch K2 in series and is connected with an e tap of the primary side of the matching transformer MT; the head end of a traction bus TB provided with a voltage transformer VT is connected in parallel between a switch K1 and a switch K2 in a primary line of a matching transformer MT; the g tap of the MT secondary side of the matching transformer is connected with the a terminal of the SVG 1; the b terminal of the static var generator SVG1 is connected with a steel rail T; f taps of the primary side and h taps of the secondary side of the transformer MT are matched to be grounded; the power supply arm head end C1 is connected in series with a switch K3 and then connected in parallel between a g tap of the secondary side of the matching transformer MT and a connecting line of an a terminal of the static var generator SVG1, a current transformer CT is arranged between the power supply arm head end C1 and the connecting line of the switch K3, and the power supply arm head end C1 is connected in series with a switch K4 and is connected with a traction bus TB; the C terminal of the static var generator SVG2 is connected with a switch K5 in series and then connected with the tail end C2 of the power supply arm in parallel, and the d terminal of the static var generator SVG2 is connected with a steel rail T; the measuring end of the current transformer CT, the measuring end of the voltage transformer VT, the measuring end of the weather sensor MS and the measuring end of the ice thickness measuring device IM are connected with the input interface of the measuring unit MU, the output interface of the measuring unit MU is connected with the input interface of the ice melting control unit CU, and the output interface of the ice melting control unit CU is respectively connected with the input port of the power control unit PU and the input port of the switch control unit SU; the output port of the switch control unit SU is respectively connected with the control ends of the switch K1, the switch K2, the switch K3, the switch K4 and the switch K5; the output port of the power control unit PU is respectively connected with the control ends of the static var generator SVG1 and the static var generator SVG 2;
control method of ice melting loop of electrified railway overhead contact system
1. Ice melting loop preparation
The meteorological conditions along the line, the ice thickness of the overhead contact system, the head end current and the head end voltage of the power supply arm are monitored in real time through five sensing devices of the measuring unit MU; when the ice melting control unit CU judges that the overhead line meets the ice melting condition, the switch control unit SU firstly controls the switch K4 and the switch K1 to be sequentially switched off, and the overhead line is powered off; then the switch K2 is controlled to be closed, the matching transformer MT and the static var generator SVG1 are connected, the switch K3 is closed, the head end C1 of the power supply arm is connected to the secondary side of the matching transformer MT, the switch K5 is closed, and the static var generator SVG2 is connected; finally, the switch K1 is controlled to be switched on, the ice melting loop is put in;
2. Detailed description of the embodiments Ice melting
The power control unit PU controls the static var generator SVG2 to generate reactive current meeting the deicing requirement, and simultaneously controls the static var generator SVG1 to generate reactive current with the same size and opposite properties as those of the static var generator SVG2, so that the reactive current circulates in a catenary deicing loop, and the ice is melted by utilizing Joule heat;
3. Exit from the ice-melting state
When the ice melting control unit CU judges that the overhead line does not meet the ice melting condition, the power control unit PU controls the static var generator SVG1 and the static var generator SVG2 to stop working, and the switch control unit SU firstly controls the switch K1 to switch off; then the switch K5, the switch K3 and the switch K2 are controlled to be sequentially opened, and the ice melting device is withdrawn from operation; and finally, the switch K1 and the switch K4 are controlled to be sequentially switched on, and the contact network recovers power supply.
The working principle of the invention is as follows: when the overhead contact system meets the set ice melting condition, the head end C1 of the power supply arm is disconnected from the traction bus TB and connected to the MT secondary side of the matching transformer, and the voltage of the overhead contact system is reduced from 27.5kV to the voltage of the low-voltage side of the matching transformer. The static var generator SVG2 generates reactive current meeting the deicing requirement, and the static var generator SVG1 generates reactive current with the same size and opposite properties as those of the static var generator SVG2, so that the reactive current circulates in a built traction network deicing loop, and the joule heat is utilized for deicing.
Compared with the prior art, the invention has the beneficial effects that:
When ice melting, the overhead contact system presents a low-voltage state, on one hand, the tail end SVG can be directly connected with the tail end of the power supply arm, and no matching transformer is needed, so that the number of matching transformers needed by the ice melting device is reduced; on the other hand, under the condition of certain ice melting current, the capacity of the ice melting device can be effectively reduced along with the reduction of the voltage of the traction network, so that the difficulty of ice melting technology and cost investment are reduced, and the ice melting efficiency and the practicability are improved.
Drawings
FIG. 1 is a schematic view of an embodiment of the present invention
FIG. 2 is a control flow diagram of the present invention
Detailed Description
The invention is further described below with reference to the drawings and detailed description. The specific flow for constructing the overhead line system ice melting loop is as follows:
The primary side of the traction transformer TT is connected with A, B, C of a three-phase power grid, one end of the secondary side is connected with a steel rail or grounded, and the other end of the secondary side is connected with a switch K1 and a switch K2 in series and is connected with an e tap of the primary side of the matching transformer MT; the head end of a traction bus TB provided with a voltage transformer VT is connected in parallel between a switch K1 and a switch K2 in a primary line of a matching transformer MT; the g tap of the MT secondary side of the matching transformer is connected with the a terminal of the SVG 1; the b terminal of the static var generator SVG1 is connected with a steel rail T; f taps of the primary side and h taps of the secondary side of the transformer MT are matched to be grounded; the power supply arm head end C1 is connected in series with a switch K3 and then connected in parallel between a g tap of the secondary side of the matching transformer MT and a connecting line of an a terminal of the static var generator SVG1, a current transformer CT is arranged between the power supply arm head end C1 and the connecting line of the switch K3, and the power supply arm head end C1 is connected in series with a switch K4 and is connected with a traction bus TB; according to the ice melting requirement, the static var generator SVG2 can be arranged at the tail end of a power supply arm, and can melt ice coating on the power supply arm between the traction substations and the subareas, and can also be arranged at the adjacent traction substations, and melt ice coating on the contact network between the two traction substations, when the ice coating on the power supply arm is melted, the C terminal of the static var generator SVG2 is connected in series with the switch K5 and then connected in parallel with the tail end C2 of the power supply arm, and the d terminal of the static var generator SVG2 is connected with the steel rail T; the measuring end of the current transformer CT, the measuring end of the voltage transformer VT, the measuring end of the weather sensor MS and the measuring end of the ice thickness measuring device IM are connected with the input interface of the measuring unit MU, the output interface of the measuring unit MU is connected with the input interface of the ice melting control unit CU, and the output interface of the ice melting control unit CU is respectively connected with the input port of the power control unit PU and the input port of the switch control unit SU; the output port of the switch control unit SU is respectively connected with the control ends of the switch K1, the switch K2, the switch K3, the switch K4 and the switch K5; the output port of the power control unit PU is respectively connected with the control ends of the static var generator SVG1 and the static var generator SVG 2;
2. control method of ice melting loop of electrified railway overhead contact system
1. Ice melting loop preparation
The meteorological conditions along the line, the ice thickness of the overhead contact system, the head end current and the head end voltage of the power supply arm are monitored in real time through five sensing devices of the measuring unit MU; when the ice melting control unit CU judges that the overhead line meets the ice melting condition, the switch control unit SU firstly controls the switch K4 and the switch K1 to be sequentially switched off, and the overhead line is powered off; then the switch K2 is controlled to be closed, the matching transformer MT and the static var generator SVG1 are connected, the switch K3 is closed, the head end C1 of the power supply arm is connected to the secondary side of the matching transformer MT, the switch K5 is closed, and the static var generator SVG2 is connected; finally, the switch K1 is controlled to be switched on, the ice melting loop is put in;
2. Detailed description of the embodiments Ice melting
The power control unit PU controls the static var generator SVG2 to generate reactive current meeting the deicing requirement, and simultaneously controls the static var generator SVG1 to generate reactive current with the same size and opposite properties as those of the static var generator SVG2, so that the reactive current circulates in a catenary deicing loop, and the ice is melted by utilizing Joule heat;
3. Exit from the ice-melting state
When the ice melting control unit CU judges that the overhead line does not meet the ice melting condition, the power control unit PU controls the static var generator SVG1 and the static var generator SVG2 to stop working, and the switch control unit SU firstly controls the switch K1 to switch off; then the switch K5, the switch K3 and the switch K2 are controlled to be sequentially opened, and the ice melting device is withdrawn from operation; and finally, the switch K1 and the switch K4 are controlled to be sequentially switched on, and the contact network recovers power supply.
Claims (2)
1. The utility model provides an electronic railway contact net ice-melt return circuit, includes traction transformer TT, traction busbar TB and static var generator, contact net ice-melt return circuit specific structure does:
The primary side of the traction transformer TT is connected with A, B, C of a three-phase power grid, one end of the secondary side is connected with a steel rail or grounded, and the other end of the secondary side is connected with a switch K1 and a switch K2 in series and is connected with an e tap of the primary side of the matching transformer MT; the head end of a traction bus TB provided with a voltage transformer VT is connected in parallel between a switch K1 and a switch K2 in a primary line of a matching transformer MT; the g tap of the MT secondary side of the matching transformer is connected with the a terminal of the SVG 1; the b terminal of the static var generator SVG1 is connected with a steel rail T; f taps of the primary side and h taps of the secondary side of the transformer MT are matched to be grounded; the power supply arm head end C1 is connected in series with a switch K3 and then connected in parallel between a g tap of the secondary side of the matching transformer MT and a connecting line of an a terminal of the static var generator SVG1, a current transformer CT is arranged between the power supply arm head end C1 and the connecting line of the switch K3, and the power supply arm head end C1 is connected in series with a switch K4 and is connected with a traction bus TB; the C terminal of the static var generator SVG2 is connected with a switch K5 in series and then connected with the tail end C2 of the power supply arm in parallel, and the d terminal of the static var generator SVG2 is connected with a steel rail T; the measuring end of the current transformer CT, the measuring end of the voltage transformer VT, the measuring end of the weather sensor MS and the measuring end of the ice thickness measuring device IM are connected with the input interface of the measuring unit MU, the output interface of the measuring unit MU is connected with the input interface of the ice melting control unit CU, and the output interface of the ice melting control unit CU is respectively connected with the input port of the power control unit PU and the input port of the switch control unit SU; the output port of the switch control unit SU is respectively connected with the control ends of the switch K1, the switch K2, the switch K3, the switch K4 and the switch K5; the output ports of the power control unit PU are respectively connected with the control ends of the static var generator SVG1 and the static var generator SVG 2.
2. A control method of an ice melting loop of an electrified railway catenary according to claim 1, wherein:
1. Ice melting loop preparation
The meteorological conditions along the line, the ice thickness of the overhead contact system, the head end current and the head end voltage of the power supply arm are monitored in real time through five sensing devices of the measuring unit MU; when the ice melting control unit CU judges that the overhead line meets the ice melting condition, the switch control unit SU firstly controls the switch K4 and the switch K1 to be sequentially switched off, and the overhead line is powered off; then the switch K2 is controlled to be closed, the matching transformer MT and the static var generator SVG1 are connected, the switch K3 is closed, the head end C1 of the power supply arm is connected to the secondary side of the matching transformer MT, the switch K5 is closed, and the static var generator SVG2 is connected; finally, the switch K1 is controlled to be switched on, the ice melting loop is put in;
2. Detailed description of the embodiments Ice melting
The power control unit PU controls the static var generator SVG2 to generate reactive current meeting the deicing requirement, and simultaneously controls the static var generator SVG1 to generate reactive current with the same size and opposite properties as those of the static var generator SVG2, so that the reactive current circulates in a catenary deicing loop, and the ice is melted by utilizing Joule heat;
3. Exit from the ice-melting state
When the ice melting control unit CU judges that the overhead line does not meet the ice melting condition, the power control unit PU controls the static var generator SVG1 and the static var generator SVG2 to stop working, and the switch control unit SU firstly controls the switch K1 to switch off; then the switch K5, the switch K3 and the switch K2 are controlled to be sequentially opened, and the ice melting device is withdrawn from operation; and finally, the switch K1 and the switch K4 are controlled to be sequentially switched on, and the contact network recovers power supply.
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| CN202010085686.4A CN111130046B (en) | 2020-02-11 | 2020-02-11 | Ice melting loop of electrified railway overhead contact system and control method thereof |
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| CN111130046B true CN111130046B (en) | 2024-08-20 |
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| CN114530814B (en) * | 2022-04-15 | 2022-09-30 | 西南交通大学 | Direct-current deicing system for overhead contact system of electrified railway and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211151476U (en) * | 2020-02-11 | 2020-07-31 | 西南交通大学 | Ice melting loop structure of overhead contact system of electrified railway |
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| CN201446892U (en) * | 2009-07-23 | 2010-05-05 | 中铁第一勘察设计院集团有限公司 | DC Thawing System of Electrified Railway Catenary Systems |
| CN102756672B (en) * | 2011-04-28 | 2015-05-13 | 株洲变流技术国家工程研究中心有限公司 | Ice melting system for overhead contact system of electric railway |
| CN202084892U (en) * | 2011-05-29 | 2011-12-21 | 西南交通大学 | Power frequency online anti-icing and de-icing device of contact net in electrified railway |
| CN102437542A (en) * | 2011-12-20 | 2012-05-02 | 中铁二院工程集团有限责任公司 | Alternating current ice melting system of electrified railway traction network |
| RU2485656C1 (en) * | 2012-03-23 | 2013-06-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уральский государственный университет путей сообщения" (УрГУПС) | Method for catenary wires heating |
| CN102832582B (en) * | 2012-09-12 | 2015-03-25 | 西南交通大学 | Online anti-icing and de-icing control system of alternating current electrified railway catenary |
| CN103247991B (en) * | 2013-04-22 | 2015-09-30 | 铁道第三勘察设计院集团有限公司 | A kind of contact nets in electrified railways utilize phase fault to realize anti-icing de-icing method |
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| CN211151476U (en) * | 2020-02-11 | 2020-07-31 | 西南交通大学 | Ice melting loop structure of overhead contact system of electrified railway |
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