CN211351725U - Electrified railway traction power supply system based on multi-source access structure - Google Patents
Electrified railway traction power supply system based on multi-source access structure Download PDFInfo
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- CN211351725U CN211351725U CN201922491871.9U CN201922491871U CN211351725U CN 211351725 U CN211351725 U CN 211351725U CN 201922491871 U CN201922491871 U CN 201922491871U CN 211351725 U CN211351725 U CN 211351725U
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Abstract
The application discloses an electrified railway traction power supply system based on a multi-source access structure, which comprises a power supply unit, an energy storage unit and a traction network unit, wherein the power supply unit at least comprises two of a distributed wind turbine generator, a distributed photovoltaic unit, a fuel battery pack, a diesel engine/small hydropower unit, a power distribution network and a high-voltage power grid; the energy storage unit comprises energy storage equipment, an energy storage converter and a split traction transformer. Electrified railway pulls power supply system, has broken away from the transition dependence to high voltage electric network, can be according to wind, light, water etc. natural endowment and other convenient power of electrified railway construction ground, form energy supply system in a flexible way, utilize energy storage unit "assemble all the time, release as required" energy migration technical characteristic, realize that weak rack does not have the power supply of pulling under the rack power supply network safety, reliable, lasting even, solve current electrified railway and pull a great deal of unfavorable problem of power supply system simultaneously.
Description
Technical Field
The utility model relates to an electric railway pulls power supply system based on multisource inserts structure belongs to the railway network field.
Background
The electrified railway traffic is an important support for realizing the regional economic integration and the cross-regional economic development synergy of China and solving the imbalance of the social economic development of different regions. However, the existing power grid and the traction power supply system are closely coupled and have large mutual influence, and a plurality of problems exist, specifically as follows:
adverse effect of existing traction power supply system on power grid side
(1) Under the existing traction network and power grid architecture of the electrified railway, other types of power supply electric energy except a high-voltage power grid cannot be utilized.
(2) And a plurality of electric phase separation devices arranged along the traction network have huge investment and high operation and maintenance cost.
(3) The electric locomotive is a high-power, asymmetric and pulse single-phase load, which not only seriously affects the electric energy quality (negative sequence, harmonic wave and power factors) of a 220kV/110kV high-voltage power grid, but also increases the peak load regulation pressure of the power grid.
(II) adverse effect of the existing traction power supply system on the side of the railway
(1) The transition of the traction power supply system depends on a grid frame strong high-voltage power grid, so that the construction difficulty and the cost of the electrified railway in the weak areas (such as Sichuan and Qinghai-Tibet areas) of the power grid are high, and the popularization of the railway electrification technology in China is seriously influenced.
(2) The reliability, continuity and safety of the operation of the conventional electric railway traction system completely depend on a power grid system, and once the power grid fails, the operation of an electrified railway is greatly and negatively influenced.
In view of the above, the present inventors have studied this problem and developed a traction power supply system for an electric railway based on a multi-source access structure.
Disclosure of Invention
The utility model aims at providing an electric railway pulls power supply system based on multisource access structure can realize that the power supply of pulling under the weak rack even no rack is safe, reliable, lasting.
In order to achieve the above object, the solution of the present invention is:
the electrified railway traction power supply system based on the multi-source access structure comprises a power supply unit, an energy storage unit and a traction network unit, wherein the power supply unit charges the energy storage unit, and the energy storage unit supplies power to the traction network unit to meet the power supply requirement of a locomotive; the power supply unit at least comprises two of a distributed wind turbine generator, a distributed photovoltaic set, a fuel cell set, a diesel engine/small hydropower set, a power distribution network and a high-voltage power grid; the energy storage unit comprises energy storage equipment, a plurality of energy storage converters connected with the energy storage equipment and a split traction transformer for boosting.
Preferably, the distributed wind turbine generator set, the distributed photovoltaic set and the fuel cell set form a direct-current microgrid structure or an alternating-current microgrid is cooperated to charge the energy storage device.
Preferably, the diesel/small hydropower pack directly provides electric energy to the energy storage device through a low-voltage alternating current bus (determined by the outlet voltage level).
Preferably, the power distribution network is 10/35kV, the high-voltage power grid is 66/110/220kV, and the 10/35kV power distribution network is connected with a low-voltage alternating-current bus (0.4kV) through a step-down transformer (so as to facilitate the type selection of equipment such as a transformer, a switch and the like) and charge energy storage equipment; the 66/110/220kV high-voltage power grid is connected with a high-voltage alternating-current bus (27.5kV) (the type of equipment such as a transformer, a switch and the like is convenient to select) through a traction step-down transformer and the switch (a power supply arm is provided with an organic vehicle and is closed through the switch), so that electric energy is provided for energy storage equipment.
Preferably, the fuel cell stack is connected to a hydrogen production facility, and electrical energy is generated by the hydrogen production facility.
Preferably, the energy storage device is one or more of an electrochemical energy storage device, a physical energy storage device and an electromagnetic energy storage device.
Preferably, the electrochemical energy storage device is one or more of a lead-acid battery, a lead-carbon battery, a sodium-sulfur battery, an all-return flow battery, a lithium battery or a fuel battery.
Preferably, the physical energy storage equipment adopts one or more of pumped storage, flywheel storage or compressed air.
Preferably, the electromagnetic energy storage device adopts one or more of super-capacitor or superconducting electromagnetism.
Electric railway pulls power supply system based on multisource access structure, broken away from the transition dependence to high voltage electric network, can be according to the wind, light, nature such as water of electric railway construction ground and endow and other convenient power, form energy supply system in a flexible way, utilize energy storage unit "assemble all the time, release as required" energy migration technical characteristic, realize that the power supply of pulling under the weak rack even does not have the rack is safe, reliable, lasting, solve current electric railway and pull a great deal of unfavorable problem of power supply system simultaneously.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a topology structure diagram (common direct current microgrid) of an electrified railway traction power supply system based on a multi-source access structure in embodiment 1;
fig. 2 is a topology structure diagram (common ac microgrid) of the electric railway traction power supply system based on the multi-source access structure in embodiment 2.
Detailed Description
Example 1
As shown in fig. 1, a traction power supply system for an electrified railway based on a multi-source access structure includes a power supply unit 1, an energy storage unit 2, and a traction network unit 3. The power supply unit 1 is a multi-type power supply unit, and can be combined with local concrete resource conditions and a power grid structure to configure various power supplies according to needs and be flexibly combined. The system can comprise a distributed wind turbine generator set 11, a distributed photovoltaic set 12, a fuel battery set 13, a diesel engine/small hydropower set 14, an 10/35kV power distribution network 15 and a 66/110/220kV high-voltage power grid 16.
The energy storage unit 2 comprises N sets of energy storage devices 21, N × m energy storage converters 22 connected with the energy storage devices 21, and N split traction transformers 23 for boosting. The energy storage device 21 may be one or more of an electrochemical energy storage device, a physical energy storage device, and an electromagnetic energy storage device. The electrochemical energy storage equipment adopts one or more of a lead-acid battery, a lead-carbon battery, a sodium-sulfur battery, a total-return flow battery, a lithium battery or a fuel battery. The physical energy storage equipment adopts one or more of pumped storage, flywheel energy storage or compressed air. The electromagnetic energy storage equipment adopts one or more of super-capacitor or superconducting electromagnetism. The energy storage capacity and the technical scheme can be specifically determined according to the actual engineering geographic position, local resources, technical maturity and characteristics, economy and the like, and can be configured in a customized mode. The energy storage unit 2 collects energy of various special-shaped power supplies in real time and meets the requirement of electric energy required by the electric power receiving vehicle when passing. The energy storage converter 22 performs bidirectional conversion of the stored dc power to ac power.
In this embodiment, the distributed wind turbine generator 11, the distributed photovoltaic group 12, and the fuel cell group 13 form a dc microgrid structure to cooperatively charge the energy storage device 21. The fuel cell stack 13 is connected to a hydrogen production apparatus 17, and generates electric energy by the hydrogen production apparatus 17. The diesel/small hydro-electric group 14 directly provides electrical energy to the energy storage device 21 through a 0.4kV low voltage ac bus (outlet voltage class determination). The 10/35kV power distribution network is connected with a 0.4kV low-voltage alternating-current bus through a step-down transformer 4 (the type selection of equipment such as a transformer, a switch and the like is facilitated), and energy storage equipment is charged; the 66/110/220kV high-voltage power grid is connected with the 27.5kV high-voltage alternating-current bus (the type of equipment such as a transformer, a switch and the like is convenient to select) through a traction step-down transformer 5 and the switch 6 (the power supply arm is provided with an organic vehicle and the power supply arm is not provided with an inorganic vehicle and the power supply arm is closed through the switch 6), and the power is provided for the energy storage equipment 21. The 0.4kV low-voltage alternating-current bus realizes interconnection among sections through the section switch 24, and the section switch 24 is added, so that the selection of the capacity of the low-voltage bus is facilitated. And the m energy storage converters 22 are connected with the 1 split traction transformer 23 to realize the transfer of energy storage energy. N split traction transformers 23 boost the 0.4kV alternating current low voltage to form a 27.5kV traction network, and the power supply requirement of the locomotive is met.
The traction net unit 3 is mainly composed of a contact line, a track, a return line, a locomotive, an opening and closing station and the like.
The electrified railway traction power supply system based on the multi-source access structure comprises 3 operation conditions which can be divided according to the operation state:
(1) energy storage discharge mode (on demand): when the master control monitors that the power supply arm has the locomotive to pass through and is in a traction state, the plurality of stored energy cooperatively output at the moment (if a power distribution network or a high-voltage power grid exists in the power supply unit 1, the power supply unit is disconnected with a connected switch at the moment, the influence on the power quality of the power grid is avoided, and equipment such as wind power, photovoltaic or fuel cells can continuously charge the stored energy), so that the power utilization requirement of the electric locomotive is met.
(2) Energy storage charging mode (full time): when the master control system monitors that the power supply arm inorganic vehicle passes through or runs in an idle state, various special-shaped power supplies in the power supply unit 1 charge the energy storage device 21 in a low-current equalizing mode; when the master control system monitors that the power supply arm locomotive operates in a braking state, various special-shaped power supplies (such as a power supply unit comprising a power distribution network or a high-voltage power grid, a connection switch is disconnected, the power supply unit is in a hot standby state, and the power supply unit does not charge the energy storage unit) charge the energy storage device 21 in a low-current equalizing manner, and meanwhile, the energy storage unit 2 recovers braking energy of the electric locomotive.
(3) Energy storage assisted service mode (according to plan): when the power supply unit 1 comprises a power distribution network or a high-voltage power grid and the power grid needs auxiliary services such as peak regulation, frequency modulation and voltage regulation, the traction power supply system meets the power supply requirement of a locomotive, and the energy storage unit 2 interacts with the power grid according to a planned output curve given by the power grid in an intelligent manner to provide the auxiliary services for the power grid.
Example 2
In the present embodiment, as shown in fig. 2, the distributed wind turbine generator 11, the distributed photovoltaic group 12, and the fuel cell group 13 form an ac microgrid structure to cooperatively charge the energy storage device 21. The distributed wind turbine generator 11, the distributed photovoltaic generator 12, and the fuel cell stack 13 are collected on a 0.7kV alternating current bus (the voltage level is determined by the alternating current outlet voltage of the wind turbine generator), and the electrical connection condition and the device principle of other parts are the same as those in embodiment 1, and therefore, the description thereof is omitted.
The application discloses electrified railway pulls power supply system based on multisource inserts structure has following advantage:
benefits to the railroad side
(1) The electrified railway traction power supply system subverts the traditional power supply mode of the electric railway traction system, utilizes the technical characteristics of energy time migration of full-time convergence and on-demand release of stored energy to various special-shaped power supplies according to natural endowments of wind, light, water and the like and power grid architectures in different areas, designs the power supply scheme of the traction power supply system in a customized mode, and realizes the economic construction of the electric railway traction power supply system in areas with weak power grids or even without power grids.
(2) The existing traction substation is changed, a high-capacity traction transformer is reduced or even cancelled, the utilization rate of the transformer is greatly improved, and the annual capacity electric charge is greatly reduced.
(3) The energy storage unit 2 can utilize the reactive power regulation capability of the PCS converter, reduce the capacity of reactive power regulation equipment such as SVC/SVG and the like, and reduce the initial investment of the equipment and the later operation and maintenance cost.
(4) The braking energy of the locomotive and the motor train unit can be completely recovered by utilizing the energy storage unit 2, the waste of high-quality electric energy is avoided, the pressure of locomotive heat dissipation equipment is weakened, meanwhile, the locomotive is not required to be assembled with a large number of unloading resistors, the vehicle-mounted weight is reduced, and the light-load design of the locomotive and the motor train unit is facilitated.
(5) The electrical equipment in the traction power supply system adopts a modular design, and is reasonably distributed according to the site position, so that the installation and construction amount of civil engineering site equipment is greatly reduced, the engineering construction period is shortened, the construction cost is reduced, the land area occupation is reduced, and the ecological influence is small.
(6) The power type and the energy storage type are widely selected and freely combined, the self-consistency of the energy supply of the electrified railway system can be realized by utilizing natural endowments such as wind, light and water on the spot and the configuration of the electric net rack is simplified intensively, and the flexibility of the construction of the electrified railway is improved
(7) The traction power supply system is decentralized in arrangement, unitized in equipment and centralized in control, the configuration redundancy of the power supply unit and the energy storage unit is high, and the continuity, reliability and safety of traction power supply are high.
Second, benefits to the grid side
(1) The direct connection between the traction network and the power grid is blocked by utilizing the stored energy, the loose coupling between the power grid and the traction network is realized, and the electric energy quality influences of negative sequence, harmonic wave, power factors and the like brought to the high-voltage power grid by the conventional traction power supply system are eliminated.
(2) The influence of the electric energy quality brought to a high-voltage power grid by a traction power supply system can be eliminated, so that a large amount of electric phase splitting equipment can be eliminated, and the engineering construction investment and the later operation and maintenance cost are greatly reduced.
(3) The construction of 220kV high-voltage transmission lines and high-voltage traction substations is not needed, secondary electrical equipment related to the high-voltage transmission lines and the high-voltage traction substations is reduced, the land acquisition area is reduced, the construction cost is greatly reduced, the construction period is shortened, and the later operation and maintenance cost is reduced.
(4) The system has the functions of a traction substation and an energy storage power station, realizes the function of combining the traction substation and the energy storage power station, can meet the power utilization requirement of a locomotive, can provide auxiliary services such as peak regulation, frequency regulation, voltage regulation and the like for a power grid, improves the regulation margin of the power grid, and promotes the construction of high-proportion clean energy of the power grid.
(5) The capacity of a power supply monomer in the power supply unit is small, the energy storage unit is charged in a small current equalizing mode by the aid of the various special-shaped power supplies in a real-time cooperation mode (the service life of an energy storage system is prolonged, the utilization rate of a transformer is improved), the energy storage unit collects electric energy of various power supplies, the electric energy is released in a centralized mode when the locomotive runs in a traction state, the power supply of high-power and impact locomotive loads is met, and the safe, reliable and continuous power supply of the small power supplies for the high-power and intermittent loads is.
(6) The energy storage unit 2 can be used as an emergency power supply of the electric railway traction power supply system and can also be used as a black start power supply of a power grid.
(7) The power supply is green and clean, the environment is friendly, and the proportion of clean energy power generation is improved.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. Electrified railway pulls power supply system based on multisource access structure, its characterized in that: the energy storage system comprises a power supply unit, an energy storage unit and a traction network unit, wherein the power supply unit charges the energy storage unit, and the energy storage unit supplies power to the traction network unit to meet the power supply requirement of a locomotive; the power supply unit at least comprises two of a distributed wind turbine generator, a distributed photovoltaic set, a fuel cell set, a diesel engine/small hydropower set, a power distribution network and a high-voltage power grid; the energy storage unit comprises energy storage equipment, a plurality of energy storage converters connected with the energy storage equipment and a split traction transformer for boosting.
2. The electrified railway traction power supply system based on the multi-source access structure of claim 1, wherein: the distributed wind turbine generator set, the distributed photovoltaic set and the fuel cell set form a direct-current micro-grid structure or an alternating-current micro-grid to charge the energy storage device in a cooperative mode.
3. The electrified railway traction power supply system based on the multi-source access structure of claim 1, wherein: the diesel engine/small hydropower unit directly provides electric energy for the energy storage equipment through a low-voltage alternating current bus.
4. The electrified railway traction power supply system based on the multi-source access structure of claim 1, wherein: the distribution network is 10/35kV, the high-voltage power grid is 66/110/220kV, and the 10/35kV distribution network is connected with a low-voltage alternating-current bus through a step-down transformer to charge energy storage equipment; the 66/110/220kV high-voltage power grid is connected with the high-voltage alternating-current bus through the traction step-down transformer and the switch to provide electric energy for the energy storage equipment.
5. The electrified railway traction power supply system based on the multi-source access structure of claim 1, wherein: the fuel cell set is connected with hydrogen production equipment, and electric energy is generated by the hydrogen production equipment.
6. The electrified railway traction power supply system based on the multi-source access structure of claim 1, wherein: the energy storage device is one or more of an electrochemical energy storage device, a physical energy storage device and an electromagnetic energy storage device.
7. The electrified railroad traction power supply system based on a multi-source access structure of claim 6, wherein: the electrochemical energy storage equipment adopts one or more of a lead-acid battery, a lead-carbon battery, a sodium-sulfur battery, a total-return flow battery, a lithium battery or a fuel battery.
8. The electrified railroad traction power supply system based on a multi-source access structure of claim 6, wherein: the physical energy storage equipment adopts one or more of pumped storage, flywheel energy storage or compressed air.
9. The electrified railroad traction power supply system based on a multi-source access structure of claim 6, wherein: the electromagnetic energy storage equipment adopts one or more of super-capacitor or superconducting electromagnetism.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113500948A (en) * | 2021-07-15 | 2021-10-15 | 陈建明 | Low-emission safe and reliable rail transit system power supply method, equipment and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500948A (en) * | 2021-07-15 | 2021-10-15 | 陈建明 | Low-emission safe and reliable rail transit system power supply method, equipment and system |
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