CN113675837A - Direct current traction power supply system based on system energy storage and network voltage maintenance - Google Patents
Direct current traction power supply system based on system energy storage and network voltage maintenance Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 63
- 238000012423 maintenance Methods 0.000 title claims abstract description 17
- 230000003137 locomotive effect Effects 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 230000001172 regenerating effect Effects 0.000 claims abstract description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
A direct current traction power supply system based on system energy storage and network voltage maintenance is used for effectively optimizing the scheme of the whole traction power supply system including traction substation distribution and traction network current-carrying modes, reducing the engineering investment and improving the operation flexibility of engineering. And an external incoming line power supply supplies power to a traction substation along the rail transit engineering through a medium-voltage ring network connection. A complete set of system energy storage and network voltage maintaining device is arranged in an interval range between traction substations, and the traction substations and the complete set of system energy storage and network voltage maintaining device are directly connected with a traction network and jointly supply power to rolling stock running along the line; when the voltage of the traction network is higher or when the locomotive vehicle is in a regenerative braking state, the energy storage and network voltage maintaining device of the complete system absorbs and stores electric energy from the traction network, so that the energy-saving operation of the system is realized.
Description
Technical Field
The invention relates to rail transit engineering, in particular to a direct-current traction power supply system based on system energy storage and network voltage maintenance.
Background
At present, light urban rail transit projects such as modern tram projects, air rails, cloud rails and the like are popularized and applied more and more in China, a traction power supply system of the traction power supply system mostly adopts a DC1500V (or DC750V) traction network as a traction power supply system for train operation power taking, power is supplied to an uplink line and a downlink line on two sides respectively through a traction substation direct current feeder line, and under the condition that any one traction substation breaks down and quits, power can be continuously supplied in a large bilateral power supply mode, so that the reliability of the whole traction power supply system is ensured.
Compared with the conventional subway/light rail engineering with large transport capacity, the rail traffic engineering is considered as a special light-load rail traffic engineering because the load of the whole traction power supply system is light due to smaller passenger capacity and smaller vehicle marshalling and lower driving density.
Although passenger traffic intensity and traffic density are low, in a distribution scheme of the traction substation, in consideration of a voltage drop index of the traction network and a power supply support capability of a cross-region in the case of fault exit of any traction substation, more traction substations are still arranged to supply power to the traction network. Because the equipment facilities and the types related in the traction substation are more, the configuration is complex, the occupied area is large, the engineering investment is more, the initial purpose of reducing the engineering investment is expected for the rail transit engineering, and certain troubles are brought to later engineering implementation, operation management cost and the like.
Therefore, aiming at the current situation of the requirements of the special light-load type rail traffic engineering, in order to reduce the engineering investment and the occupation of the land and simultaneously meet the traction network voltage drop index and the requirement of vehicle regenerative braking energy absorption under the normal and fault operation conditions of the direct current traction power supply system, the scheme of the direct current traction power supply system based on system energy storage and network voltage maintenance is provided from the aspects of safe and reliable operation, energy-saving operation of the system and convenient construction, installation, operation management and maintenance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a direct current traction power supply system based on system energy storage and network voltage maintenance, which fully utilizes the characteristics of interval traveling of traction networks and large fluctuation range of voltage of interval traction networks, so as to effectively realize the optimization of the whole traction power supply system scheme including the distribution of a traction substation and the current-carrying form of the traction networks, reduce the engineering investment and improve the operation flexibility of engineering.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a direct-current traction power supply system based on system energy storage and network voltage maintenance.A power supply with an external incoming line supplies power to a traction substation along a rail transit project through a medium-voltage ring network connection wire. A complete set of system energy storage and network voltage maintaining device is arranged in an interval range between traction substations, and the traction substations and the complete set of system energy storage and network voltage maintaining device are directly connected with a traction network and jointly supply power to rolling stock running along the line; the distribution point setting scheme of the traction substation only considers the condition of normal power supply; when a certain traction substation quits operation or other conditions and the voltage of the traction network in a section is lower when the rolling stock passes through, the energy storage and network voltage maintaining device of the complete system arranged in the adjacent section continuously supplies power to the traction network so as to meet the normal operation of the rolling stock; when the voltage of the traction network is higher or when the locomotive vehicle is in a regenerative braking state, the energy storage and network voltage maintaining device of the complete system absorbs and stores electric energy from the traction network, so that the energy-saving operation of the system is realized.
The complete system energy storage and network voltage maintaining device integrates input switch equipment, an incoming line voltage detection device, an inversion power module, a UPS power module, a large-capacity energy storage unit, a monitoring unit and a DC-DC bidirectional chopping module into a complete device cabinet body; the incoming line voltage detection device monitors the direct current voltage which is connected to the complete device from the traction network through the direct current incoming line cable in real time, and a monitoring unit of the device automatically controls the complete device to switch among various working modes according to the voltage fluctuation and the change condition of the traction network; the UPS module of the device provides working power supply for the complete device.
The beneficial effects of the invention are mainly reflected in the following aspects:
the scheme can completely meet various operation requirements of light urban rail transit projects such as modern tramcars, air rails, cloud rails and the like, and can be installed and applied in various project forms such as underground sections, elevated sections, ground sections and the like;
the complete system energy storage and traction network voltage maintaining device realizes the functions of normal energy storage, regenerative braking energy storage and traction network voltage maintenance according to the real-time voltage and load condition of a traction network, and can be combined and configured according to the field power supply capacity requirement and the modularized power to realize large-capacity energy storage and power supply output. The working power supply required by the device can be automatically provided according to the field condition of the project, and an adjacent substation is not required to provide alternating current and direct current working power supplies, so that the system project amount is simplified, and the project investment is saved;
after the complete set is adopted, data are collected in real time through the voltage and current sensors, the operation condition of the traction network is combined, and the function of connection or disconnection with the traction network can be automatically realized through closing or breaking the input loop switch.
The device integrates and combines an incoming line loop and a corresponding switch, a single-phase (or three-phase) inversion power module, a DC-DC bidirectional chopping module, a large-capacity energy storage unit, a current and voltage detection and monitoring device unit and the like into a cabinet body, has high integration level and small floor area, can be flexibly arranged in a traction power supply interval as required, and is convenient for operation management and maintenance;
aiming at the characteristics of low running number and light load of the light rail transit line, the traction power supply system scheme can store electric energy in an energy storage element of the device through a traction network by utilizing running gaps and adopting a low-current charging mode, so that the influence on the traction network is reduced as much as possible; when the network voltage index of the traction network is low, high power and large capacity can be realized to provide electric energy for the traction network according to requirements, and the power supply capacity of the traction network is maintained.
Sixthly, the incoming line main switch in the cabinet body adopts an isolating switch or a load switch with an obvious fracture after the device is adopted, so that safe and reliable breaking during maintenance and overhaul is realized; through adopting circuit breaker (load switch, contactor etc.), the complete sets inserts the direct live working operation in return circuit as required, and need not to have a power failure with the transformer substation or draw the net, and its action time is short, can effectively improve the operation flexibility and the security of engineering.
The direct-current traction power supply system based on system energy storage and network voltage maintenance can effectively realize the optimization of the whole traction power supply system scheme including a traction substation point distribution scheme and a traction network current-carrying form without other special measures, reduces the engineering investment and improves the operation flexibility of the engineering.
Drawings
The specification includes the following three drawings:
fig. 1 is a schematic structural diagram of a dc traction power supply system based on system energy storage and network voltage maintenance according to the present invention;
FIG. 2 is a schematic structural diagram of an energy storage and network pressure maintaining device of the complete system;
fig. 3 is a schematic diagram illustrating the principle of converting the working modes of the energy storage and network pressure maintaining device of the complete system.
The figures show the components and the corresponding labels: the system comprises an external incoming line power supply 1, a medium-voltage ring network wiring 2, a traction substation 3, a complete system energy storage and network voltage maintaining device 4, a locomotive vehicle 5, a traction network 6, a direct current incoming line cable 61, a voltage detection device 62, an incoming line isolating switch 63, an incoming line breaker 64, an incoming line loop current sensor 65, a direct current contactor 66, an intra-cabinet direct current connection busbar 67, an inverter power module 68, a UPS power supply module 69, an intra-cabinet alternating current output connection busbar 70, a DC-DC bidirectional chopping module 81, a large-capacity energy storage unit 82, a monitoring unit 80 and a cabinet body 90.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to the attached drawing 1, the invention relates to a direct current traction power supply system based on system energy storage and network voltage maintenance, which is characterized in that: an external incoming line power supply 1 supplies power to traction substations 3 along the track traffic engineering through a medium-voltage ring network connection 2, a complete set of system energy storage and network voltage maintaining device 4 is arranged in an interval range between the traction substations 3, and the traction substations 3 and the complete set of system energy storage and network voltage maintaining device 4 are directly connected with a traction network 6 and supply power to rolling stock 5 running along the track; the distribution distance of the traction substations 3 can only consider the condition of normal power supply, when any one traction substation 3 stops running, the complete system energy storage and network voltage maintaining device 4 arranged in the adjacent region continuously supplies power to the traction network 6, so that the normal running of the rolling stock 5 is met, and the lowest voltage is not lower than the value required by the specification (DC1000V or DC 500V); when the voltage of the traction network 6 is higher or when the locomotive vehicle 5 is in a regenerative braking state, the integrated system energy storage and network voltage maintaining device 4 absorbs and stores electric energy from the traction network 6, so that the energy-saving operation of the system is realized, and the maximum voltage of the traction network 6 is limited to be not higher than the value required by the specification (DC1800V or DC 900V).
The voltage fluctuation range requirements of different direct current traction power supply system voltages (DC1500V or DC750V) are different. The following description will be made in detail by taking DC1500V DC traction power supply system voltage as an example.
Referring to fig. 2, the energy storage and grid voltage maintaining device 4 of the complete system integrates a voltage detection device 62, an incoming line isolating switch 63, an incoming line breaker 64, an incoming line loop current sensor 65, an incoming line direct current contactor 66, an intra-cabinet direct current connection busbar 67, an inverter power module 68, a UPS power module 69, a large-capacity energy storage unit 82, a monitoring unit 80, and a DC-DC bidirectional chopper module 81 into a complete device cabinet 90;
the traction network 6 is connected to an incoming line isolating switch 63 of the complete device through a direct current incoming line cable 61, and is connected to a direct current connection bus 67 in the cabinet through an incoming line breaker 64, an incoming line loop current sensor 65 and a direct current contactor 66;
one loop of the direct current connection busbar 67 in the cabinet is connected with a high-capacity energy storage unit 82 through one or more DC-DC bidirectional chopper modules 81 connected in parallel; the other circuit is connected with an in-cabinet alternating current output connection busbar 70 through an inverter power module 68 and then connected with a UPS power module 69.
The voltage detection device 62 on the incoming line side monitors the direct current voltage which is accessed to the complete set of device from the traction network 6 through the direct current incoming line cable 61 in real time, and the monitoring unit 80 automatically controls the complete set of device to switch among various working modes according to the voltage fluctuation and change condition of the traction network introduced by the monitoring unit; the UPS power module 69 provides operating power for the kit.
When the traction net works in a normal charged mode:
1. and closing an incoming line isolating switch 63, an incoming line breaker 64 and a direct current contactor 66 of the complete set of device, and connecting an external traction network power supply into a direct current connection busbar 67 in the cabinet. The direct-current voltage Uq at the side of the traction network 6 is monitored in real time through the voltage detection device 62 at the side of the incoming line, and the incoming line loop current sensor 65 monitors the incoming line current in real time.
2. The single-phase (or three-phase) inversion power module 68 is connected with the direct-current connecting bus 67 in the cabinet; the direct current voltage Um on the direct current connection busbar 67 in the cabinet is monitored in real time through the voltage detection device 62 on the bus side, when the direct current voltage Um on the direct current connection busbar 67 in the cabinet is in a normal working range, the direct current power supply is inverted and output to a single-phase (or three-phase) alternating current power supply, and the single-phase (or three-phase) alternating current power supply is output to the alternating current output connection busbar 70 in the cabinet, so that the working power supply is the operation power supply, ventilation power supply, heat dissipation power supply and the like required by the normal work of the complete device; when the direct-current voltage Um on the busbar is in an abnormal working range, the single-phase (or three-phase) inversion power module 68 is automatically locked to work; the UPS power module 69 is connected to the ac output connection busbar 70 in the cabinet, and the ac power stably output therefrom is used as an operating power when the entire apparatus is working normally, thereby ensuring safe and reliable operation of the complete apparatus.
3. The upper port of the DC-DC bidirectional chopping module 81 is connected with the DC connection busbar 67 in the cabinet, and the lower port is connected with the high-capacity energy storage unit 82.
Under the normal condition, when the voltage detection device 62 on the incoming line side detects that the direct-current voltage Uq of the traction network is higher, the DC-DC bidirectional chopping module 81 is in a forward working mode, and chops the power supply introduced to the traction network 6 to output, and charges the high-capacity energy storage unit 82 in the cabinet body, so that the energy storage of the traction power supply system is realized. When the voltage detection device 62 on the incoming line side detects that the direct-current voltage of the traction network is low, the DC-DC bidirectional chopping module 81 is in a reverse working mode, discharges the electric energy stored in the high-capacity energy storage unit 82 in the cabinet body in high power, reversely outputs chopped waves, and provides a traction power supply for the traction network 6, so that the voltage of the traction network is maintained, and the normal operation requirement of the locomotive vehicle 5 is met.
When the abnormal condition is met, when the voltage detection device 62 at the incoming line side detects that the voltage of the traction network direct-current voltage Uq is ultrahigh (Uq is more than 1850V) or ultralow (Uq is less than or equal to 800V), or when the voltage of the traction network direct-current voltage Uq is in a direct-current voltage interval without the intervention of the device (1200V is more than Uq is less than or equal to 1500V), the operation of the DC-DC bidirectional chopping module 81 is automatically locked, and the output is stopped.
When the traction network voltage is in an abnormal condition:
1. when the voltage detection device 62 at the incoming line side detects that the direct current voltage Uq of the traction network is ultrahigh (Uq is more than 1850V) or ultralow (Uq is less than or equal to 800V), the incoming line breaker (64) is disconnected, and the complete set of device is separated from the traction network 6.
2. When the incoming line breaker 64 is detected to be in a disconnected state, the inside of the device enters a standby working mode, the DC-DC bidirectional chopping module 81 is controlled to enter a reverse working mode, electric energy stored in the high-capacity energy storage unit 82 is discharged, chopping is reversely output to the DC connection busbar 67 in the cabinet, and when the DC voltage Um on the busbar is in a normal working range, the single-phase (or three-phase) inversion power module (68) in the complete device inverts and outputs a DC power supply to a single-phase (or three-phase) AC power supply, outputs the single-phase (or three-phase) AC power supply to the AC output connection busbar 70 in the cabinet, and continuously provides working power supplies for operation, ventilation, heat dissipation and the like required by normal working of the device; when the energy in the large-capacity energy storage device inside the device drops to the warning value, the DC-DC bidirectional chopping module 81 is turned off.
3. When the voltage detection device 62 on the incoming line side detects that the voltage Uq of the traction network 6 is normal, the system energy storage and traction network voltage maintaining device is automatically recovered to be put into the complete set and kept running.
When the complete equipment needs to enter a maintenance mode: the incoming line breaker 64 is disconnected, and meanwhile, the incoming line isolating switch 63 is disconnected, so that the incoming line isolating switch is completely separated from the traction net 6, an obvious breaking point is provided, and the safety of personnel and equipment during overhauling and maintenance is guaranteed.
Fig. 3 is a schematic diagram of the basic principle of the operation mode switching of the energy storage and grid voltage maintaining device 4 of the integrated system, wherein the monitoring unit 80 controls the integrated device 4 to automatically switch between the disengagement mode, the feedback mode, the standby mode, the charging mode 1 and the charging mode 2 according to the voltage fluctuation and variation of the traction grid 6 detected by the voltage detecting device 62 at the incoming line side.
The basic principle of switching the operation mode of the complete system energy storage and grid voltage maintaining device 4 (simply referred to as "complete device") is described below by taking the DC1500V DC traction power supply system voltage as an example:
1. and setting the voltage of the traction network 6 as Uq, and when the voltage of the traction network is more than 800V and less than or equal to 1850V, the voltage is a normal working mode interval of the complete set of equipment. The complete equipment is put into corresponding switch equipment of an input loop, is directly connected with the traction network 6 and is put into operation; the complete device automatically switches between the following operating modes according to the voltage Uq measured on a voltage detection device (62) at the incoming line side of the traction network:
(1) and when the voltage Uq of the traction network is less than or equal to 800V, the mode is a disengagement mode. The plant opens the switchgear of the input circuit (opening the incoming circuit breaker 64 or the direct current contactor 66), disengages from the traction network 6 and exits as a whole. At the moment, the DC-DC bidirectional chopping module 81 enters a reverse working mode, reversely chops and outputs energy in the high-capacity energy storage unit 82, supplies power to the inversion power module 68 and the UPS power module 69 inside the device, maintains the electrified working mode of the device, and sends out fault alarm information of too low voltage of the traction network.
When the energy in the large-capacity energy storage unit 82 falls to a warning value, the DC-DC bidirectional chopper module 81 stops operating.
(2) When the voltage of the traction network is more than 800V and less than or equal to 1200V, the normal working mode is adopted. The complete equipment is put into operation, at the moment, the DC-DC bidirectional chopping module 81 enters a reverse working mode, energy in the high-capacity energy storage unit 82 is chopped and reversely output, electric energy is supplemented to the traction network 6, and the voltage of the traction network is maintained to supply to the locomotive 5.
And when the traction network voltage Uq is less than or equal to 1200V all the time, sending out fault alarm information of too low traction network voltage.
(3) When the voltage of the traction network is more than 1200V and less than or equal to 1500V, the capacity of the large-capacity energy storage unit 82 of the device is lower than 60 percent, and the reverse output current is less than 50A (the specific data can be adjusted according to the field condition), the complete device stops working and enters a standby mode. The DC-DC bidirectional chopper module 81 is removed from operation, and the traction network 6 passes through the DC bus inside the apparatus, and then goes to the inverter power module 68 and the UPS power module 69, maintaining the live working mode of the complete apparatus itself.
(4) When the voltage of the traction network is more than 1500V and less than or equal to 1750V, the charging mode is 1. The traction network 6 is connected with a direct current bus inside the device, supplies power to the inversion power module 68 and the UPS power module 69, and maintains the self electrified working mode of the device; meanwhile, the DC-DC bidirectional chopping module 81 is put into operation, enters a forward chopping mode, supplements energy to the high-capacity energy storage unit 82 through the traction network 6, and after the high-capacity energy storage unit is charged to a 70% capacity state (the specific proportion can be adjusted according to the field condition), the DC-DC bidirectional chopping module 81 exits the forward chopping mode.
(5) When the traction network voltage is 1750V < Uq < 1850V, the charging mode is 2. The traction network is connected with a direct current bus inside the device, supplies power to the inversion power module 68 and the UPS power module 69, and maintains the self electrified working mode of the device; meanwhile, the DC-DC bidirectional chopping module 81 is put into operation and enters a forward chopping working mode, energy is supplemented to the high-capacity energy storage unit 82 through the traction network 6, and after the charging is carried out to a capacity state of 100%, the DC-DC bidirectional chopping module 81 exits the operation of the forward chopping working mode.
(6) When the traction network voltage Uq is larger than 1850V, the mode is the disengagement mode. The plant opens the switchgear of the input circuit (opening the incoming circuit breaker 64 or the direct current contactor 66), disengages from the traction network 6 and exits as a whole. The DC-DC bidirectional chopping module 81 enters a reverse working mode, the high-capacity energy storage unit 82 supplies power to the inversion power module 68 and the UPS power module 69, the self electrified working mode of the device is maintained, and fault alarm information of over-high voltage of the traction network is sent out.
In the above respective modes, when the energy in the large-capacity energy storage unit 82 decreases to the warning value, the DC-DC bidirectional chopping module 81 is turned off.
2. The voltage measured by a voltage detection device (62) arranged on a direct current bus 67 in the complete set device is set to be Um, and an inverter power module 68 in the complete set device automatically switches between the following two working modes according to the corresponding measured voltage Um:
(1) when the voltage of the direct current bus in the device is not less than 800V and not more than Um and not more than 1850V, the direct current bus is in a normal working mode of the inversion power module 68 and is automatically put into operation, and a normal working power supply is provided for the complete device.
(2) When the voltage Um of the direct current bus inside the device is less than 800V or more than 1850V, the inversion power module 68 automatically exits from operation and enters a standby mode; the internal operating power of the plant is maintained by the UPS power module 69.
The above capacity ratio, voltage and current conversion point data can be set and adjusted according to the field situation, and the description only explains the basic principle, and is not necessarily limited to these data.
Claims (2)
1. The utility model provides a direct current pulls power supply system based on system's energy storage and net voltage maintain, outside inlet wire power supply (1) through medium voltage looped netowrk wiring (2) to the power supply of the transformer substation (3) that pulls along the line of track traffic engineering, characterized by: a complete set of system energy storage and network voltage maintaining device (4) is arranged in an interval range between traction substations (3), and the traction substations (3) and the complete set of system energy storage and network voltage maintaining device (4) are directly connected with a traction network (6) and jointly supply power to rolling stock (5) running along the line; the distribution distance of the traction substations (3) only considers the condition of normal power supply, when one traction substation (3) exits from operation or other conditions and the voltage of the interval traction network (6) is lower when a locomotive passes, the complete system energy storage and network voltage maintaining device (4) arranged in the adjacent interval continuously supplies power to the traction network (6) to meet the normal operation of the locomotive (5); when the voltage of the traction network (6) is higher or when the rolling stock (5) is in a regenerative braking state, the energy storage and network voltage maintaining device (4) of the complete system absorbs and stores electric energy from the traction network (6), so that the energy-saving operation of the system is realized.
2. The system of claim 1, wherein the system energy storage and grid voltage maintenance based dc traction power supply system comprises: the complete system energy storage and network voltage maintaining device (4) integrates a voltage detection device (62), an incoming line isolating switch (63), an incoming line breaker (64), an incoming line loop current sensor (65), an incoming line direct current contactor (66), an intra-cabinet direct current connection busbar (67), an inverter power module (68), a UPS power module (69), a large-capacity energy storage unit (82), a monitoring unit (80) and a DC-DC bidirectional chopping module (81) into a complete device cabinet body (90);
the traction network (6) is connected to an incoming line isolating switch (63) of the complete device through a direct current incoming line cable (61) and is connected with a direct current connecting bus bar (67) in the cabinet through an incoming line breaker (64), an incoming line loop current sensor (65) and a direct current contactor (66);
one loop of the direct current connection busbar (67) in the cabinet is connected with a high-capacity energy storage unit (82) through one or more DC-DC bidirectional chopping modules (81) connected in parallel; the other loop is connected with an AC output connecting bus bar (70) in the cabinet through an inverter power module (68) and then is connected with a UPS power module (69).
The incoming line voltage detection device (62) on the incoming line side monitors the direct current voltage accessed to the complete device from the traction network (6) through the direct current incoming line cable (61) in real time, and the monitoring unit (80) automatically controls the complete device (4) to switch among a separation mode, a feedback mode, a standby mode and a charging mode according to the voltage fluctuation and the change condition of the monitoring unit; the voltage detection device (62) on the bus side in the device monitors the voltage of a direct current connection busbar (67) in the complete device cabinet in real time, and the monitoring unit (80) automatically controls an inversion power module (68) in the complete device (4) to switch between a normal working mode and a standby mode of quitting the operation according to the voltage fluctuation and the change condition of the voltage; the UPS power module (69) provides working power for the complete set of equipment.
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