CN114530814B - Direct-current deicing system for overhead contact system of electrified railway and control method thereof - Google Patents
Direct-current deicing system for overhead contact system of electrified railway and control method thereof Download PDFInfo
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- CN114530814B CN114530814B CN202210392746.6A CN202210392746A CN114530814B CN 114530814 B CN114530814 B CN 114530814B CN 202210392746 A CN202210392746 A CN 202210392746A CN 114530814 B CN114530814 B CN 114530814B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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Abstract
The invention discloses a direct-current ice melting system of an electrified railway contact network and a control method thereof, and relates to the technical field of traction power supply of electrified railways. The direct-current ice melting system comprises an AC/DC converter, a direct-current source and a controller; the controller combines the renewable energy consumption and the balance of the active power and the reactive power of the two traction buses as the target according to the real-time voltage, the current, the meteorological data and the icing condition of the overhead contact system, and ensures the electric energy quality of the traction power supply system while realizing the ice melting. The method meets the requirement of direct-current ice melting under the conditions that the original topology of a traction power supply system is not changed and equipment is not added; and the energy generated by the renewable energy source or the energy storage device can be applied to the direct current ice melting system.
Description
Technical Field
The invention belongs to the technical field of electrified railways, and particularly relates to a direct-current deicing system of an electrified railway overhead line system and a control method thereof.
Background
The electrified railway is an important facility of national economy in China, and in recent years, the operating mileage of the electrified railway in China is continuously increased. Because the breadth of our country is wide, the contact net of the electrified railway faces various severe environments, the icing of the contact net is a common natural disaster, the contact line, the catenary, the connecting part, the insulator and the like are broken, the power supply is interrupted, the operation of the locomotive is influenced, and even the pantograph is damaged and the locomotive operation accident is caused. Therefore, the research on the ice melting technology for the overhead contact system of the electrified railway has great significance. The ice melting of the overhead contact system mainly aims at melting the ice coated on the contact line and the catenary.
Deicing of an overhead contact system of the electrified railway is mainly divided into heating deicing and mechanical deicing. Mechanical deicing is the scraping of surface ice by scraping. The heating ice melting is to utilize the joule heat effect to perform current heating on a wire for deicing an electrified railway contact network, and is the most effective ice coating prevention and removal technology. The heating ice melting comprises alternating current ice melting and direct current ice melting, and the direct current ice melting takes an ice coating line as a load and provides a short circuit current heating wire for the ice coating line. Inductive components in line impedance can be ignored in the direct current ice melting, the ice melting efficiency is improved, the direct current voltage for ice melting can be adjusted, and the voltage requirements of different ice coating lines can be met.
At present, the scheme of heating and deicing an overhead line system of an electrified railway mainly comprises the following steps:
1) the ice melting device based on the static var generator SVG has high regulation speed, can meet ice melting requirements under different environments, but has large required capacity and high equipment cost, and increases the matching transformer to reduce the SVG capacity, reduce the SVG cost and increase the transformer cost; 2) the single-phase direct-current voltage output by the rectifier transformer and the cascade rectifier unit is adopted to provide heat for ice melting, and the scheme needs to separately arrange an ice melting device, so that extra cost is increased; 3) the direct current ports of the single-phase converters on the two sides of the back-to-back converter are changed from parallel connection to serial connection, an ice melting device is not needed to be arranged independently, the direct current ice melting efficiency is high, the ice melting direct current voltage/current is controllable, but the back-to-back converter is large in capacity, complex in structure and high in cost and is not beneficial to engineering application.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a direct-current ice melting system of an electrified railway overhead line system and a control method thereof, which can effectively solve the ice coating phenomenon of the overhead line system and can apply renewable energy sources and energy storage to the ice melting system. The ice melting system is simple in structure, easy to control, low in cost and beneficial to engineering application.
In order to achieve the purpose, the invention adopts the technical scheme that: a DC ice melting system for an electrified railway contact network comprises a switch S 1 Traction bus TB connected with traction transformer α Through a switch S 2 Traction bus TB connected with traction transformer β The controller comprises an AC/DC converter AD, a direct current source DS and a controller CC; the method is characterized in that: terminal a of AC/DC converter AD passes through switch S 3 And traction bus TB α Connected, the terminal b of the AC/DC converter AD passes through a switch S 4 And traction bus TB β The terminals c and d of the AC/DC converter AD are connected through a switch S 5 And switch S 6 Is connected with an alpha uplink T line alpha UTL and a beta downlink T line beta DTL of a contact network; the direct current source DS is connected with a direct current side c terminal and a direct current side d terminal of the AC/DC converter AD; the voltage transformer PT is bridged on the traction bus TB α Traction bus TB β Both ends of (a); the current transformer CT is connected in series with an alpha uplink T line alpha UTL; alpha upstream T line alpha UTL and beta of contact netThe uplink T lines beta UTL pass through the switches S respectively 11 Switch S 12 And traction bus TB α Traction bus TB β Connecting; the signal ends of the voltage transformer PT, the current transformer CT, the meteorological sensor MS and the ice thickness measuring device IM are all connected with the input end of a controller CC, and the output end of the controller CC is respectively connected with a switch S 1 Switch S 2 Switch S 3 Switch S 4 And a switch S 5 Switch S 6 And a switch S 7 And a switch S 8 And a switch S 9 Switch S 10 Switch S 11 Switch S 12 The control end of the controller is connected; a bidirectional signal port of the controller CC is respectively connected with bidirectional signal ports of the AC/DC converter AD, a bypass switch BA and a bypass switch BD thereof and a direct current source DS; the AC/DC converter AD can operate in four quadrants, the controller CC controls the AC/DC converter AD to realize independent bidirectional flow of energy of the terminal a and the terminal b, and direct current electric energy required by ice melting is output at the terminal c and the terminal d.
Further, an AC/DC converter AD 1 The first port of the AC side corresponds to the terminal a of the AC/DC converter AD, and the second port corresponds to the AC/DC converter AD 2 The first port of the AC side is cascaded, and the steps are carried out until the AC/DC converter AD n-1 Second port of AC side and AC/DC converter AD n The first ports on the alternating current side are cascaded; AC/DC converter AD n The second port of the AC side corresponds to the b terminal of the AC/DC converter AD and passes through the reactor R and the switch S in sequence 4 And traction bus TB β Connecting; AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BA is respectively arranged between the first port and the second port of the alternating current side 1 Bypass switch BA 2 . n (ii) a AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BD is respectively arranged between the first port and the second port of the direct current side 1 BD, bypass switch 2 . n (ii) a AC/DC converter AD 1 The first port on the DC side corresponds to the c terminal of the AC/DC converter AD, the AC/DC converter AD 1 DC side second port and AC/DC converter AD 2 The first port on the direct current side is cascaded, and the steps are carried out until the AC/DC converter AD m-1 Second port of direct current side and AC/DC converter AD m The first ports on the direct current side are cascaded; AC/DC converter AD m The second port of the direct current side corresponds to a d terminal of the AC/DC converter AD; AC/DC converter AD m+1 . n The direct current side of the system can be connected with a distributed direct current source DS and a centralized direct current source DS, wherein m and n are positive integers, and n is larger than or equal to m.
Preferably, the connection method for accessing the distributed direct current source DS is to connect the direct current source DS m+1 DC source DS m+2 . n Respectively connected with an AC/DC converter AD m+1 AC/DC converter AD m+2 . n Is connected to the dc side of (c).
Preferably, the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected with the secondary winding of the multi-winding transformer MT, the first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, the second port corresponds to the terminal b of the AC/DC converter AD, and the two ports sequentially pass through the reactor R and the switch S 4 And traction bus TB β And (4) connecting.
Preferably, the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected to the secondary windings of the multi-winding transformer MT, a first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, a second port of the primary side of the multi-winding transformer MT corresponds to the terminal b of the AC/DC converter AD, and the first port, the second port and the terminal b of the AC/DC converter AD sequentially pass through the reactor R and the switch S 4 And a traction bus TB β Connecting; AC/DC converter AD m+1 . n The dc side of (2) is connected to a distributed dc source DS.
Preferably, the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is to connect the AC side of the transformer to the secondary winding of the multi-winding transformer MT respectively and to perform multi-windingA first port of a primary side of the group transformer MT corresponds to a terminal a of the AC/DC converter AD, a second port corresponds to a terminal b of the AC/DC converter AD, and the first port, the second port and the terminal b sequentially pass through the reactor R and the switch S 4 And traction bus TB β Connecting; AC/DC converter AD m+1 . n The dc side of (2) is connected to a centralized dc source DS.
Preferably, the dc source DS includes, but is not limited to, an energy storage device, a photovoltaic, a fan, or other dc power source.
On the other hand, the invention also provides a control method of the direct-current deicing system of the overhead contact system of the electrified railway, which comprises the following three steps:
step one, ice melting system preparation
When cold tides come and a premonitory sign of icing of the overhead line system possibly appears, the controller CC judges whether ice melting is needed or not in time according to the monitored meteorological data, the icing condition of the overhead line system and the real-time voltage and current of the system; when the controller CC judges that the overhead line system needs to melt ice, the switch S is controlled first 11 Switch S 12 Make the traction bus TB α Powering off; then controls the switch S 1 Switch S 2 Switch S 3 Switch S 4 Sequentially disconnecting to cut off an alpha uplink T line alpha UTL and a beta uplink T line beta UTL of the contact network; re-control switch S 5 Switch S 6 Sequentially closing, connecting AC/DC converter AD and DC source DS circuit, and making switch S 7 And a switch S 8 Switch S 9 Switch S 10 Closing the ice melting loop in sequence to form an ice melting loop; finally, the switch S is sequentially switched on 3 Switch S 4 Switch S 1 Switch S 2 The closed circuit forms closed-loop connection to supply power to the ice melting loop;
step two, specifically implementing ice melting
The controller CC controls the AC/DC converter AD to provide the voltage required by ice melting for the ice melting loop, the specific control method comprises an energy management layer and an equipment control layer, in the energy management layer, the renewable energy source output power, the energy storage charge state and the health state are detected in real time, whether the DC source DS meets the energy required by the ice melting loop is judged, and if yes, the DC source DS is controlled to meet the energy required by the ice melting loopThe DS independently provides required voltage for the ice melting loop; if the direct current source DS can not provide all energy for the ice melting loop, controlling the AC/DC converter AD to obtain energy from the traction bus and provide required voltage for the ice melting loop together with the direct current source DS; energy management layer uses renewable energy source to absorb and balance traction bus TB α And a traction bus TB β Calculating to obtain renewable energy output in a direct current source DS, energy storage device charging and discharging, amplitude of AD current of an AC/DC converter and reference values of phase angles, and then sending results to an equipment control layer; the equipment control layer adopts a control strategy to control the running states of the AC/DC converter AD, the renewable energy sources and the energy storage device, and the electric energy quality of a traction power supply system needs to be ensured while ice melting is realized; the control strategy comprises but is not limited to a voltage and current double closed-loop control strategy, a model prediction control strategy and a sliding variable structure control strategy;
step three, exiting the ice-melting state
When the controller CC judges that the overhead contact system does not meet the ice-melting condition according to the meteorological data, the ice-melting loop quits the operation, firstly, the switch S is sequentially disconnected 1 Switch S 2 Switch S 3 Switch S 4 Powering off the ice melting loop; then, the switch S is turned off in sequence 5 And a switch S 6 Switch S 7 Switch S 8 And a switch S 9 Switch S 10 Exiting the ice melting loop; finally, switch S is closed 11 Switch S 12 Switch S 1 Switch S 2 Switch S 3 Switch S 4 And the power supply state of the contact net is recovered.
Preferably, the control method of the direct-current ice melting system of the overhead contact system of the electrified railway provided by the invention has a fault-tolerant function, and the controller CC detects the AD of the AC/DC converter in real time 1 … AC/DC converter AD i … AC/DC converter AD n If the ith AC/DC converter AD i And (3) failure, then: AC/DC converter AD for AC side connection with multi-winding transformer i Disconnecting the connection to the multi-winding transformer and closing the bypass switch BD i (ii) a For crossingAC/DC converter AD with current side not connected with multi-winding transformer i Closing bypass switch BA i And a bypass switch BD i . If the ith AC/DC converter AD i And (3) normally, then: AC/DC converter AD for AC side connection with multi-winding transformer i Continuing to maintain connection with the multi-winding transformer and disconnecting the bypass switch BD i (ii) a AC/DC converter AD without connection to multi-winding transformer for AC side i By-pass switch BA is turned off i And a bypass switch BD i Wherein i is a positive integer, and i is not more than n.
The beneficial effects of the technical scheme are as follows:
(1) the single-phase transformation device ADS can meet the requirement of direct-current ice melting without changing the topology of the original traction power supply system and increasing equipment when the overhead line system is covered with ice; renewable energy sources or energy storage devices can be applied to direct-current deicing;
(2) according to the invention, while the direct-current ice melting is realized, renewable energy sources can be consumed, the active power and the reactive power of two phases of the traction bus can be balanced as much as possible, and the electric energy quality of a traction power supply system is ensured;
(3) the invention has simple structure, easy control, low cost and convenient popularization and application.
Drawings
FIG. 1 is a structural diagram of a direct current ice melting system of an electrified railway overhead line system of the invention;
FIG. 2 is a block diagram of a system structure of a first embodiment of a single-phase converter ADS according to the present invention;
FIG. 3 is a block diagram of a system configuration of a second embodiment of the single-phase converter ADS according to the present invention;
FIG. 4 is a block diagram of a system configuration of a third embodiment of the single-phase converter ADS according to the present invention;
FIG. 5 is a block diagram illustrating a system configuration of a fourth embodiment of a single-phase converter ADS according to the present invention;
fig. 6 is a block diagram of a direct current structure of any one of the first and second embodiments of the single-phase converter ADS according to the present invention;
fig. 7 is a block diagram of a direct current structure of any one of the third and fourth embodiments of the single-phase converter ADS according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain all other embodiments based on the principle of the present invention without making creative efforts to fall into the protection scope of the present invention.
The working principle of the invention is as follows: the voltage required by the direct-current ice melting system can be preferentially provided by renewable energy sources and energy storage devices which are accessed to the system through the direct-current side of the AC/DC converter AD, if the voltage cannot be completely met, the insufficient voltage is obtained from the traction bus through the alternating-current side of the AC/DC converter AD, and the active power and the reactive power of two phases of the traction bus are balanced as much as possible.
As shown in fig. 1 to 7, specific embodiments of a direct-current deicing system for an overhead contact system of an electrified railway and a control method thereof are provided, and the present invention is further described with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1, the invention is a structure diagram of a direct current ice melting system of an electrified railway contact network, wherein the system comprises:
including by means of a switch S 1 Traction bus TB connected with traction transformer α Through a switch S 2 Traction bus TB connected with traction transformer β The controller comprises an AC/DC converter AD, a direct current source DS and a controller CC;
terminal a of AC/DC converter AD passes through switch S 3 And traction bus TB α Connected, the terminal b of the AC/DC converter AD passes through a switch S 4 And traction bus TB β The terminals c and d of the AC/DC converter AD are connected through a switch S 5 And switch S 6 And is connected withAn alpha uplink T line alpha UTL of the touch screen is connected with a beta downlink T line beta DTL; the direct current source DS is connected with a direct current side c terminal and a direct current side d terminal of the AC/DC converter AD; the voltage transformer PT is bridged on the traction bus TB α Traction bus TB β Both ends of (a); the current transformer CT is connected in series with an alpha uplink T line alpha UTL; the alpha uplink T line alpha UTL and the beta uplink T line beta UTL of the contact net are respectively connected with the switch S 11 Switch S 12 And traction bus TB α Traction bus TB β Connecting; the signal ends of the voltage transformer PT, the current transformer CT, the meteorological sensor MS and the ice thickness measuring device IM are all connected with the input end of a controller CC, and the output end of the controller CC is respectively connected with a switch S 1 Switch S 2 Switch S 3 Switch S 4 And a switch S 5 Switch S 6 Switch S 7 Switch S 8 And a switch S 9 Switch S 10 Switch S 11 Switch S 12 The control end of the controller is connected; a bidirectional signal port of the controller CC is respectively connected with bidirectional signal ports of the AC/DC converter AD, a bypass switch BA and a bypass switch BD thereof and a direct current source DS; the AC/DC converter AD can operate in four quadrants, the controller CC controls the AC/DC converter AD to realize independent bidirectional flow of energy of the terminal a and the terminal b, and direct current electric energy required by ice melting is output at the terminal c and the terminal d.
Example two
As shown in fig. 2, a system structure block diagram of a first specific implementation of the single-phase conversion device ADS of the present invention further includes: AC/DC converter AD 1 The first port of the AC side corresponds to the terminal a of the AC/DC converter AD, and the second port corresponds to the AC/DC converter AD 2 The first port on the AC side is cascaded, and the steps are carried out until the AC/DC converter AD n-1 Second port of AC side and AC/DC converter AD n The first ports on the alternating current side are cascaded; AC/DC converter AD n The second port of the AC side corresponds to the b terminal of the AC/DC converter AD and passes through the reactor R and the switch S in sequence 4 And traction bus TB β Connecting; AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BA is respectively arranged between the first port and the second port of the alternating current side 1 Bypass switch BA 2 . n (ii) a AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BD is respectively arranged between the first port and the second port of the direct current side 1 BD, bypass switch 2 . n (ii) a AC/DC converter AD 1 The first port on the DC side corresponds to the c terminal of the AC/DC converter AD, the AC/DC converter AD 1 DC side second port and AC/DC converter AD 2 The first port on the direct current side is cascaded, and the steps are carried out until the AC/DC converter AD m-1 Second port of direct current side and AC/DC converter AD m The first ports on the direct current side are cascaded; AC/DC converter AD m The second port of the direct current side corresponds to a d terminal of the AC/DC converter AD; AC/DC converter AD m+1 . n The direct current side of the power supply can be connected with a distributed direct current source DS and a centralized direct current source DS, wherein m and n are positive integers, and n is larger than or equal to m.
The connection method for accessing the distributed direct current source DS is to connect the direct current source DS m+1 DC source DS m+2 . n Respectively connected with an AC/DC converter AD m+1 AC/DC converter AD m+2 . n Is connected to the dc side of (c).
As shown in fig. 3, a system structure block diagram of a second specific embodiment of the single-phase conversion device ADS of the present invention further includes: the connection method for connecting the centralized direct current source DS is to connect an AC/DC converter AD m+1 AC/DC converter AD m+2 AC/DC converter AD n The direct current side of the direct current Bus is connected in parallel with a direct current Bus provided with a direct current source DS.
As shown in fig. 4, a system structure block diagram of a third specific embodiment of the single-phase conversion device ADS of the present invention further includes: the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected with the secondary winding of the multi-winding transformer MT, the first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, the second port corresponds to the terminal b of the AC/DC converter AD,and passes through the reactor R and the switch S in turn 4 And traction bus TB β Connecting;
AC/DC converter AD m+1 AC/DC converter AD n The dc side of (2) is connected to a distributed dc source DS.
As shown in fig. 5, a system structure block diagram of a fourth specific embodiment of the single-phase conversion device ADS of the present invention further includes:
the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected with the secondary winding of the multi-winding transformer MT, the first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, the second port corresponds to the terminal b of the AC/DC converter AD, and the two ports sequentially pass through the reactor R and the switch S 4 And traction bus TB β Connecting;
AC/DC converter AD m+1 AC/DC converter AD n The dc side of (2) is connected to a distributed dc source DS.
The dc source DS includes, but is not limited to, an energy storage device, a photovoltaic, a fan, or other dc power source.
EXAMPLE III
On the other hand, the control method of the ice melting system of the overhead line system of the electrified railway comprises the following three steps:
step one, ice melting system preparation
When cold tides come and a premonitory sign of icing of the overhead line system possibly appears, the controller CC judges whether ice melting is needed or not in time according to the monitored meteorological data, the icing condition of the overhead line system and the real-time voltage and current of the system; when the controller CC judges that the overhead line system needs to melt ice, the switch S is controlled first 11 Switch S 12 Make the traction bus TB α Powering off; then controls the switch S 1 Switch S 2 Switch S 3 Switch S 4 Sequentially disconnecting to cut off an alpha uplink T line alpha UTL and a beta uplink T line beta UTL of the contact network; re-control switch S 5 Switch S 6 Sequentially closing, connecting AC/DC converter AD and DC source DS circuit, and making switch S 7 Switch S 8 Switch S 9 Switch S 10 Closing the ice melting loop in sequence to form an ice melting loop; finally, the switch S is sequentially switched on 3 Switch S 4 And a switch S 1 And a switch S 2 The closed circuit forms closed-loop connection to supply power to the ice melting loop;
step two, specifically implementing ice melting
The controller CC controls the AC/DC converter AD to provide the voltage required by ice melting for the ice melting loop, the specific control method comprises an energy management layer and an equipment control layer, in the energy management layer, the renewable energy source output power, the energy storage charge state and the health state are detected in real time, whether the DC source DS meets the energy required by the ice melting loop or not is judged, and if yes, the DC source DS is controlled to provide the required voltage for the ice melting loop independently; if the direct current source DS can not provide all energy for the ice melting loop, controlling the AC/DC converter AD to obtain energy from the traction bus and provide required voltage for the ice melting loop together with the direct current source DS; energy management layer uses renewable energy to consume and balance traction bus TB α And a traction bus TB β The active power and the reactive power are taken as targets, renewable energy output in a direct current source DS, charging and discharging of an energy storage device and amplitude values and phase angle reference values of AD current of an AC/DC converter are obtained through calculation, and then the results are issued to an equipment control layer; the equipment control layer adopts a control strategy to control the running states of the AC/DC converter AD, the renewable energy sources and the energy storage device, and the electric energy quality of a traction power supply system needs to be ensured while ice melting is realized; the control strategy comprises but is not limited to a voltage and current double closed-loop control strategy, a model prediction control strategy and a sliding mode variable structure control strategy;
step three, exiting the ice-melting state
When the controller CC judges that the catenary does not meet the ice-melting condition according to meteorological data, the ice-melting loop quits operation, and firstly, the switch S is sequentially disconnected 1 Switch S 2 Switch S 3 Switch S 4 Powering off the ice melting loop; then, the switch S is turned off in sequence 5 Switch S 6 Switch S 7 Switch S 8 And a switch S 9 Switch S 10 Exiting the ice melting loop; finally, switch S is closed 11 Switch S 12 Switch S 1 Switch S 2 Switch S 3 Switch S 4 And the power supply state of the contact net is recovered.
Example four
As shown in FIG. 6, the control method of the direct current ice melting system of the overhead contact system of the electrified railway provided by the invention has a fault tolerance function, and can detect the AD of the AC/DC converter in real time 1 … AC/DC converter AD i … AC/DC converter AD n If the ith AC/DC converter AD i If it is faulty, the bypass switch BA is closed i And a bypass switch BD i (ii) a If the ith AC/DC converter AD i If normal, the bypass switch BA is turned off i And a bypass switch BD i Wherein i is a positive integer, and i is not more than n.
EXAMPLE five
As shown in FIG. 7, the control method of the direct current ice melting system of the overhead contact system of the electrified railway provided by the invention has a fault tolerance function, and can detect the AD of the AC/DC converter in real time 1 … AC/DC converter AD i … AC/DC converter AD n If the ith AC/DC converter AD i In case of failure, the connection with the multi-winding transformer is disconnected and the bypass switch BD is closed i (ii) a If the ith AC/DC converter AD i Normally, the connection with the multi-winding transformer is continuously maintained and the bypass switch BD is disconnected i Wherein i is a positive integer and i is less than or equal to n.
Claims (10)
1. A DC ice melting system for an electrified railway contact network comprises a pass switch S 1 Traction bus TB connected with traction transformer α Through a switch S 2 Traction bus TB connected with traction transformer β The controller comprises an AC/DC converter AD, a direct current source DS and a controller CC; the method is characterized in that: terminal a of AC/DC converter AD passes through switch S 3 And traction bus TB α Connected, the terminal b of the AC/DC converter AD passes through a switch S 4 And traction bus TB β The terminals c and d of the AC/DC converter AD are connected through a switch S 5 And switch S 6 In contact withAn alpha uplink T line alpha UTL and a beta downlink T line beta DTL of the network are connected; the direct current source DS is connected with a direct current side c terminal and a direct current side d terminal of the AC/DC converter AD; the voltage transformer PT is bridged on the traction bus TB α Traction bus TB β Both ends of (a); the current transformer CT is connected in series with an alpha uplink T line alpha UTL; the alpha uplink T line alpha UTL and the beta uplink T line beta UTL of the contact net are respectively connected with the switch S 11 Switch S 12 And traction bus TB α Traction bus TB β Connecting; the signal ends of the voltage transformer PT, the current transformer CT, the meteorological sensor MS and the ice thickness measuring device IM are all connected with the input end of a controller CC, and the output end of the controller CC is respectively connected with a switch S 1 Switch S 2 Switch S 3 Switch S 4 Switch S 5 Switch S 6 And a switch S 7 Switch S 8 Switch S 9 Switch S 10 And a switch S 11 Switch S 12 The control end of the controller is connected; a bidirectional signal port of the controller CC is respectively connected with bidirectional signal ports of the AC/DC converter AD, a bypass switch BA and a bypass switch BD thereof, and a direct current source DS; the AC/DC converter AD can operate in four quadrants, the controller CC controls the AC/DC converter AD to realize independent bidirectional flow of energy of the terminal a and the terminal b, and direct current electric energy required by ice melting is output at the terminal c and the terminal d.
2. The direct-current deicing system for overhead contact lines of electrified railways according to claim 1, characterized in that: AC/DC converter AD 1 The first port of the AC side corresponds to the terminal a of the AC/DC converter AD, and the second port corresponds to the AC/DC converter AD 2 The first port on the AC side is cascaded, and the steps are carried out until the AC/DC converter AD n-1 Second port of AC side and AC/DC converter AD n The first ports on the alternating current side are cascaded; AC/DC converter AD n The second port of the AC side corresponds to the b terminal of the AC/DC converter AD and passes through the reactor R and the switch S in sequence 4 And traction bus TB β Connecting; AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BA is respectively arranged between the first port and the second port of the alternating current side 1 Bypass switch BA 2 . n (ii) a AC/DC converter AD 1 AC/DC converter AD 2 . n A bypass switch BD is respectively arranged between the first port and the second port of the direct current side 1 BD, bypass switch 2 . n (ii) a AC/DC converter AD 1 The first port of the DC side corresponds to the c terminal of the AC/DC converter AD, the AC/DC converter AD 1 DC side second port and AC/DC converter AD 2 The first port on the direct current side is cascaded, and the steps are carried out until the AC/DC converter AD m-1 Second port of direct current side and AC/DC converter AD m The first ports on the direct current side are cascaded; AC/DC converter AD m The second port of the direct current side corresponds to a d terminal of the AC/DC converter AD; AC/DC converter AD m+1 . n The direct current side of the system can be connected with a distributed direct current source DS and a centralized direct current source DS, wherein m and n are positive integers, and n is larger than or equal to m.
3. The direct-current deicing system for overhead contact lines of electrified railways according to claim 2, characterized in that: the connection method for accessing the distributed direct current source DS is to connect the direct current source DS m+1 DC source DS m+2 . n Respectively connected with an AC/DC converter AD m+1 AC/DC converter AD m+2 . n Is connected to the dc side of (c).
4. The direct-current deicing system for overhead contact lines of electrified railways according to claim 2, characterized in that: the connection method for connecting the centralized direct current source DS is to connect an AC/DC converter AD m+1 AC/DC converter AD m+2 . n The direct current side of the direct current Bus is connected in parallel with a direct current Bus provided with a direct current source DS.
5. The direct-current deicing system for overhead contact lines of electrified railways according to claim 3, characterized in that: the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected with the secondary winding of the multi-winding transformer MT, the first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, the second port corresponds to the terminal b of the AC/DC converter AD, and the two ports sequentially pass through the reactor R and the switch S 4 And a traction bus TB β And (4) connecting.
6. The direct-current deicing system for overhead contact lines of electrified railways according to claim 4, characterized in that: the AC/DC converter AD 1 AC/DC converter AD 2 . n The other connection method is that the alternating current side of the multi-winding transformer MT is respectively connected to the secondary windings of the multi-winding transformer MT, the first port of the primary side of the multi-winding transformer MT corresponds to the terminal a of the AC/DC converter AD, the second port of the primary side of the multi-winding transformer MT corresponds to the terminal b of the AC/DC converter AD, and the first port and the second port sequentially pass through the reactor R and the switch S 4 And traction bus TB β And (4) connecting.
7. The system according to claim 2, wherein the dc source DS comprises but is not limited to an energy storage device, a photovoltaic, a fan, or other dc power source.
8. The control method of the direct-current deicing system of the overhead contact system of the electrified railway based on the claim 1 comprises the following three steps:
step one, ice melting system preparation
When cold tides come and a premonitory sign of icing of the overhead line system possibly appears, the controller CC judges whether ice melting is needed or not in time according to the monitored meteorological data, the icing condition of the overhead line system and the real-time voltage and current of the system; when the controller CC judges that the overhead line system needs to melt ice, the switch S is controlled first 11 Switch S 12 Make the traction bus TB α Powering off; then controls the switch S 1 And a switch S 2 Switch S 3 Switch S 4 Sequentially disconnecting to cut off an alpha uplink T line alpha UTL and a beta uplink T line beta UTL of the contact network; re-control switch S 5 Switch S 6 Are sequentially closed and connectedInto the AC/DC converter AD and DC source DS circuits and to switch S 7 Switch S 8 And a switch S 9 And a switch S 10 Closing the ice melting loop in sequence to form an ice melting loop; finally, the switch S is sequentially switched on 3 Switch S 4 Switch S 1 Switch S 2 The closed circuit forms closed-loop connection to supply power to the ice melting loop;
step two, specifically implementing ice melting
The controller CC controls the AC/DC converter AD to provide the voltage required by ice melting for the ice melting loop, the specific control method comprises an energy management layer and an equipment control layer, in the energy management layer, the renewable energy source output power, the energy storage charge state and the health state are detected in real time, whether the DC source DS meets the energy required by the ice melting loop or not is judged, and if yes, the DC source DS is controlled to provide the required voltage for the ice melting loop independently; if the direct current source DS cannot provide all energy for the ice melting loop, controlling the AC/DC converter AD to obtain energy from the traction bus and provide required voltage for the ice melting loop together with the direct current source DS; energy management layer uses renewable energy to consume and balance traction bus TB α And a traction bus TB β Calculating to obtain renewable energy output in a direct current source DS, energy storage device charging and discharging, amplitude of AD current of an AC/DC converter and reference values of phase angles, and then sending results to an equipment control layer; the equipment control layer adopts a control strategy to control the running states of the AC/DC converter AD, the renewable energy sources and the energy storage device, and the electric energy quality of a traction power supply system needs to be ensured while ice melting is realized; the control strategy comprises but is not limited to a voltage and current double closed-loop control strategy, a model prediction control strategy and a sliding mode variable structure control strategy;
step three, exiting the ice-melting state
When the controller CC judges that the overhead contact system does not meet the ice-melting condition according to the meteorological data, the ice-melting loop quits the operation, firstly, the switch S is sequentially disconnected 1 Switch S 2 Switch S 3 Switch S 4 Powering off the ice melting loop; then, the switch S is turned off in sequence 5 Switch S 6 And a switch S 7 Switch S 8 And a switch S 9 And a switch S 10 Exiting the ice melting loop; finally, switch S is closed 11 Switch S 12 Switch S 1 Switch S 2 Switch S 3 Switch S 4 And the power supply state of the contact net is recovered.
9. The method for controlling the direct-current deicing system of the overhead contact system of the electrified railway according to claim 8, wherein the direct-current deicing system further has fault tolerance capability, and the controller CC detects the AD of the AC/DC converter in real time 1 … AC/DC converter AD i … AC/DC converter AD n If the ith AC/DC converter AD i If it is faulty, the bypass switch BA is closed i And a bypass switch BD i Converter with fault AD i Cutting operation; if AC/DC converter AD i If no fault occurs, the bypass switch BA i And a bypass switch BD i Are all disconnected, wherein i is a positive integer and is less than or equal to n.
10. The method for controlling the direct-current deicing system of the overhead contact system of the electrified railway according to claim 8, wherein the direct-current deicing system further has fault tolerance capability, and the controller CC detects the AD of the AC/DC converter in real time 1 … AC/DC converter AD i … AC/DC converter AD n If the ith AC/DC converter AD i If the fault occurs, the AC/DC converter AD is disconnected i Connection to a multi-winding transformer and closing a bypass switch BD i Will fail converter AD i Cutting operation; if AC/DC converter AD i If no fault occurs, the bypass switch BD i And (4) disconnecting, wherein i is a positive integer and is less than or equal to n.
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| CN102638019B (en) * | 2012-04-09 | 2015-02-25 | 株洲变流技术国家工程研究中心有限公司 | Direct-current catenary de-icing method of high-speed electrified railway |
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| CN107749637A (en) * | 2017-10-17 | 2018-03-02 | 西南交通大学 | A kind of provide multiple forms of energy to complement each other grid-connected system and control method applied to electric railway |
| CN111130046B (en) * | 2020-02-11 | 2024-08-20 | 西南交通大学 | Ice melting loop of electrified railway overhead contact system and control method thereof |
| CN213879227U (en) * | 2020-09-28 | 2021-08-03 | 北京交通大学 | Multifunctional direct-current online ice melting system for rail transit |
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