CN219717937U - Direct-current remote power supply system - Google Patents
Direct-current remote power supply system Download PDFInfo
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Abstract
A direct current remote power supply system comprises a plurality of power transformation and distribution stations; each power transformation and distribution substation is matched with an AC/DC converter, a busbar, a left power supply arm, a right power supply arm, a contactor, a wind-solar power supply storage device and a measurement and control and management device; the AC/DC converter, the busbar, the left power supply arm, the right power supply arm, the contactor, the wind-solar power supply storage device and the measurement and control and management device are arranged together and electrically connected; and an insulating section is electrically connected in series between every two adjacent power transformation and distribution stations and between the power output end of the fourth set of contactor of the front-end power transformation and distribution station and the power output end of the third contactor of the rear-end power transformation and distribution station. The utility model discloses combine and adopt wind-force and photovoltaic power generation to supply power for whole equipment, when corresponding a power supply region takes place the power failure, can switch adjacent transformer substation power supply, have that the carrying capacity is strong, transmission distance is far away, the power quality is stable, self energy consumption is little, wisdom energy-conserving characteristics, finally reached reduce the energy consumption, practice thrift the operation cost purpose, played technical support for wisdom highway construction.
Description
Technical Field
The utility model relates to the technical field of highway remote power supply equipment, in particular to a direct current remote power supply system.
Background
The original power supply systems such as expressways and the like have limited structures, have limited configuration power loads, and are mainly concentrated on charging facilities and simple monitoring facilities nearby an intercommunication area, so that the direct supply scheme of cables is convenient from a charging station (380V cable direct supply technical system is adopted, and the general power supply distance is within 2 km).
However, with the rapid development of road network construction, especially the rapid development of intelligent expressway construction, the traveling and management demands on vehicles are continuously improved, the road electricity load is increased year by year, the number of various data acquisition, monitoring and release devices such as vehicle detectors, road cameras, variable information boards, weather detectors, ETC (electronic toll collection) portal frames and the like arranged along the expressway is greatly increased, because these outfield devices are distributed along the road in a scattered way, and have the characteristics of typical 'scattering, long line, wide range, large power difference' and the like, the traditional power supply mode can not meet the application requirement, and this puts forward higher requirements on the power supply capability and quality of the power supply system, and the power supply distance is generally less than 4-5 km, and more than 20 km, especially in remote areas such as northwest, northeast and the like, the intercommunication distance can reach more than 30 km. Currently, in order to ensure the power supply voltage for supplying power to remote electric equipment in a long distance, a method of increasing the alternating current power supply voltage or increasing the cross-sectional area of a cable is generally adopted to improve the power supply capability. However, the improvement of the alternating current power supply voltage scheme has the influence of line inductance capacitance resistance and current skin effect, so that the line power loss is high, and new energy access such as wind-solar energy storage and the like cannot be adopted, so that the low-carbon environment-friendly concept of clean energy and green symbiosis cannot be satisfied; the method for increasing the sectional area of the cable can greatly increase construction cost and line loss when improving power supply capacity, and the tail end has poor power supply quality and is easy to damage electric equipment. In summary, there is still a great room for improvement in the existing power supply method for intelligent expressways.
Disclosure of Invention
In order to overcome the defects of the prior intelligent expressway and other power supply modes, the utility model provides a direct current remote power supply system which not only supplies power through an alternating current power supply of a power supply line under the combined action of related mechanisms, but also combines a wind driven generator and photovoltaic power generation to supply power to integral equipment, and can switch adjacent power transformation and distribution stations to supply power when a power supply area fails, thereby realizing the aims of reducing construction cost, remote power supply, safe power supply, energy conservation, environmental protection and the like.
The technical scheme adopted for solving the technical problems is as follows:
a direct current remote power supply system comprises a plurality of power transformation and distribution stations with intervals distributed along the road; the power transformation and distribution substation is characterized in that each power transformation and distribution substation is matched with an AC/DC converter, a busbar, a left power supply arm, a right power supply arm, a contactor, a wind-solar power storage device and a measurement and control and management device; the contactor is provided with four sets, the power input end of the AC/DC converter is electrically connected with an alternating current power supply, and the power output end of the wind-solar power supply storage device is electrically connected with the power input end of the measurement and control and management device; the power output end of the AC/DC converter and the power output end of the measurement and control and management equipment are respectively and electrically connected with the power input ends of the first set of contactors and the second set of contactors, the power output ends of the first set of contactors and the second set of contactors are respectively and electrically connected with the two power input ends of the bus, and the two power output ends of the bus are respectively and electrically connected with the power input ends of the third set of contactors and the fourth set of contactors; the power output ends of the third set of contactor and the fourth set of contactor are respectively electrically connected with the power input ends of the left power supply arm and the right power supply arm, the power output ends of the left power supply arm and the right power supply arm are respectively electrically connected with the plurality of sets of direct current consumer ends along the highway, and an insulating section is electrically connected in series between every two adjacent power transformation and distribution stations, the power output end of the fourth set of contactor of the front power transformation and distribution station and the power output end of the third contactor of the rear power transformation and distribution station.
Further, the wire inlet end and the wire outlet end of the insulating joint are respectively and electrically connected with an isolating switch or a circuit breaker in parallel.
Further, the wind-solar power supply storage device comprises a wind driven generator, a photovoltaic panel and a storage battery which are arranged along the highway, wherein the power supply output ends of the wind driven generator and the photovoltaic panel are electrically connected in parallel with the power supply input end of the storage battery.
Further, insulation monitoring devices are respectively arranged on positive bus bars and negative bus bars of a left power supply arm and a right power supply arm of the power transformation and distribution substation.
Further, the bus bar distance between the two adjacent power transformation and distribution stations is 15-25 km; the distance between every two adjacent insulated sections between the power transformation and distribution stations is set to be 15-25 km.
Further, the first contactor, the second contactor, the third contactor and the fourth contactor can be replaced by circuit breakers.
Further, the left power supply arm and the right power supply arm can be respectively tapped from the bus bar through a multi-path contactor.
The utility model has the beneficial effects that: under the combined action of related mechanisms, the utility model not only supplies power through an alternating current power supply of a power supply circuit, but also combines a wind driven generator and photovoltaic power generation to supply power to the whole equipment, when a power supply fault occurs in a corresponding power supply area, the utility model can also switch the power supply of adjacent power transformation and distribution stations, has the characteristics of strong carrying capacity, long transmission distance, stable power supply quality, small self energy consumption and intelligent energy conservation, and finally achieves the purposes of reducing energy consumption and saving operation cost by adjusting and intelligently controlling the power supply and distribution system as required, thereby providing favorable technical support for intelligent highway construction. Based on the above-mentioned that, the novel method has good application prospect.
Drawings
Fig. 1 is a schematic electrical structure of the present utility model.
Detailed Description
FIG. 1 shows a DC remote power supply system comprising a plurality of power transformation and distribution stations spaced apart along a highway; the power transformation and distribution substation is characterized in that each power transformation and distribution substation is matched with an AC/DC converter (for converting 380V alternating current power supply into direct current power supply), a busbar (model C45), a left power supply arm (power supply connecting piece), a right power supply arm, a contactor (model CJX 2S), a wind-light power supply storage device, a measurement and control and management device (used for controlling the alternating current power supply to independently supply power to a load, the wind-light storage system to independently supply power to the load, or the alternating current power supply and the wind-light storage system are complemented to supply power to the load, wherein the measurement and control and management device is one of an upper computer or a single chip microcomputer module); the contactor is provided with four sets, the power input end of the AC/DC converter is connected with an alternating current 380V power supply through a wire, and the power output end of the wind-solar power storage device is connected with the power input end of the measurement and control and management device through a wire; the power output end of the AC/DC converter, the power output end of the measurement and control and management equipment, the power input ends of the first set of contactors and the second set of contactors are respectively connected through wires, the power output ends of the first set of contactors and the second set of contactors are respectively connected with the two paths of power input ends of the bus bar through wires, and the two paths of power output ends of the bus bar are respectively connected with the power input ends of the third set of contactors and the fourth set of contactors through wires; the power output ends of the third set of contactor and the fourth set of contactor are respectively connected with the power input ends of the left power supply arm and the right power supply arm through wires, the power output ends of the left power supply arm and the right power supply arm are respectively connected with the ends of the direct current electric equipment along the highway through wires, and an insulating joint (an electric insulating joint finished product formed by utilizing an electromagnetic resonance principle, model HGM-J) is connected in series with the power output ends of the fourth set of contactor of the front end power substation and the power output end of the third contactor of the rear end power substation through wires.
As shown in fig. 1, the wire inlet end and the wire outlet end of the insulating joint are respectively connected in parallel with a disconnecting switch or a circuit breaker through wires. The wind-solar power supply storage device comprises a wind driven generator, a photovoltaic panel and a storage battery which are arranged along the highway, wherein the power supply output ends of the direct current wind driven generator and the photovoltaic panel are connected in parallel with the power supply input end of the storage battery through wires. And insulation monitoring devices (model DJY-2S) are respectively arranged on the positive bus bar and the negative bus bar of the left power supply arm and the right power supply arm of the power transformation and distribution substation and are used for monitoring and alarming ground faults and insulation levels. The bus bar distance between two adjacent power transformation and distribution stations is 15-25 km; the distance between every two adjacent insulated sections between the power transformation and distribution stations is set to be 15-25 km. The first contactor, the second contactor, the third contactor and the fourth contactor can be replaced by circuit breakers. The left power supply arm and the right power supply arm can be respectively connected with the bus bar in a tapping way through the multipath contactor, so that multipath output power supply is realized, and the remote power supply requirement of the scattered power loads along the road is met.
In the specific working process shown in fig. 1, the utility model is divided into two control modes, when the whole equipment works normally, the measurement and control and management equipment controls the third contactor and the fourth contactor of all the power transformation and distribution stations to be switched on normally to supply power for the electric loads along the highway, and all the isolating switches or the circuit breakers are disconnected; when a power supply fault occurs to a busbar of any power transformation and distribution station, the measurement and control and management equipment controls the third contactor and the fourth contactor of the power transformation and distribution station to be disconnected, and the adjacent isolating switch or the breaker of the power transformation and distribution station is closed, so that the right power supply arm of the power transformation and distribution station adjacent to the power transformation and distribution station is communicated with the left power supply arm of the power transformation and distribution station, and further power is supplied to related loads of the power transformation and distribution station; when the measurement and control and management equipment controls to close the right isolating switch or the breaker of the power transformation and distribution substation, the left power supply arm of the other power transformation and distribution substation adjacent to the power transformation and distribution substation is communicated with the right power supply arm of the power transformation and distribution substation, so that the load of the other power transformation and distribution substation is supplied with power. The second control mode is that when the whole operation is normal, the measurement and control and management equipment controls the third contactor and the fourth contactor of all the power transformation and distribution stations to be closed normally to supply power for the power utilization loads along the highway, and all the isolating switches or the circuit breakers are disconnected; when a positive bus bar or a negative bus bar of a left power supply arm of any power transformation and distribution station has a grounding fault or the insulation level is reduced to a set value, the insulation monitoring device cuts off a third contactor of the power transformation and distribution station and gives an alarm; when a positive bus bar or a negative bus bar of a right power supply arm of any power transformation and distribution station has a grounding fault or the insulation level is reduced to a set value, the insulation monitoring device cuts off a fourth contactor of the power transformation and distribution station and gives an alarm; when any busbar of the power transformation and distribution station has power supply faults, the measurement and control and management equipment cuts off the third contactor and the fourth contactor of the power transformation and distribution station, and closes the left disconnecting switch or the breaker of the power transformation and distribution station, so that the right power supply arm of the adjacent left power transformation and distribution station of the power transformation and distribution station is communicated with the left power supply arm of the power transformation and distribution station to supply power for related loads, and closes the right disconnecting switch or the breaker of the power transformation and distribution station, so that the left power supply arm of the adjacent right power transformation and distribution station of the power transformation and distribution station is communicated with the right power supply arm of the power transformation and distribution station to supply power for related loads. In practical situations, as the traffic flow of the expressway is large, the equipment is scattered and the distance is far, when the power supply equipment fails, the maintenance cost is very high, and the power supply system is used for the expressway equipment, and the reliability of power supply is very important; in the utility model, when the busbar faults occur, the adjacent transformer and distribution stations can still supply power; when the power supply arm has a short circuit fault and the power supply loop is required to be cut off, the corresponding power supply arm is only required to be cut off, the fault is convenient to cut off, the influence range is small, the safety is high, and the problems of reliability and safety of the expressway remote power supply can be effectively solved.
Fig. 1 shows an example of a substation 2; after the AC380V alternating current is rectified from the substation 2, the AC380V alternating current is led to the bus bar through the contactor KM21 and the bus bar through the contactor KM22, the bus bar can be independently powered by the AC380V power supply of the substation, and after the AC380V power supply and the wind-light power supply storage device are judged by the measurement and control and management device, the AC380V power supply and the wind-light power supply storage device are complemented to supply power to a load, and the wind-light power supply storage device can also be independently powered to the load. The contactors KM21 and KM22 respectively control the input and the exit of the AC380V wind-solar power storage device, and the contactor also has a fault removal function. The lower part of the busbar is provided with 2 outgoing lines through contactors KM23 and KM24, and the outgoing lines are respectively sent to loads on two sides of the expressway. The power utilization loads on the two sides of the busbar are mutually independent and mutually noninterfere, so that the power supply reliability is high; when a short circuit fault occurs on a certain loop load and the fault needs to be removed, the corresponding power supply branch is only required to be disconnected, normal power supply of other power supply arms is not affected, and the influence range is small. The power supply loop between KM14 and KM23 is broken by an insulating joint, and under normal conditions, the isolating switch is in an off state, the KM23 loop on the right side of the insulating joint is powered by the busbar 2, and the KM14 loop on the left side of the insulating joint is powered by the busbar 1. When the power supply of the busbar 2 fails, the contactor KM23 is disconnected, the isolating switch QS1 is switched on, and the load on the left side of the busbar 2 is supplied with power by the busbar 1; the contactor KM24 is disconnected, the isolating switch QS2 is switched on, and the load on the right side of the busbar 2 is powered by the busbar 3. In order to ensure the reliability of power supply and prevent excessive voltage drop, the power supply distance of one power supply arm should not exceed 25km at maximum, so that power supply can only be supported by adjacent buses, and cross-bus cross-zone power supply cannot be adopted. In short, when a problem occurs in the power supply of a certain bus bar, the power supply is supported by the adjacent power supply arms of the adjacent substations. In order to achieve both the economy and reliability of power supply, the distance between adjacent 2 bus bars is generally set to 15 to 25km, and the distance between adjacent 2 insulating joints is also generally set to 15 to 25km. The positive bus bar and the negative bus bar of the power supply arm are respectively provided with an insulation monitoring device, so that the monitoring function of the ground insulation condition is realized, and when a certain power supply arm has a ground fault or the insulation level is lowered to a set value to influence the normal power supply of the power supply arm, the ground polarity of the power supply arm can be displayed, the corresponding power supply arm is disconnected, and an alarm is given. When the insulation monitoring device is abnormal, the normal output load of the direct current loop is not influenced. According to the utility model, the wind power, the photovoltaic power and the energy storage battery (storage battery) work cooperatively, under the condition that the solar energy/wind energy is sufficient, the solar energy/wind energy is preferentially used for generating electricity, and a plurality of electric power is stored in the available storage battery; under the condition of insufficient solar energy/wind energy, the electric energy of the storage battery is preferentially used; in the case of insufficient battery power, the power difference is obtained from the ac power source, and the battery can be charged if necessary.
The AC/DC converter is characterized by direct current remote power supply, photovoltaic power generation, wind power generation and various combinations of energy storage batteries, flexible structural form, safety, reliability, low carbon and environmental protection. The utility model has the advantages of taking economical efficiency into consideration, and greatly improving the reliability and safety of the expressway remote power supply.
Compared with the traditional power supply and distribution system, the utility model can greatly improve the safety, the stability, the energy conservation and the like besides meeting the power supply requirement of the power load, and has obvious technical advantages, and the utility model is particularly characterized in the following aspects. The method comprises the following steps: the remote power supply capability is realized, the whole equipment adopts an inverter module (AC/DC converter) parallel power supply and no main current sharing working mode, the remote and high-power load capacity can be realized, the single-machine capacity can reach 1000 kW, the unidirectional power supply distance can reach 25km, and the remote power supply device is suitable for various electric field scenes of highway engineering. And two,: the high-efficiency power quality optimization management technology has the advantages of safety and reliability, provides high-quality pure power, reduces adverse effects of severe power quality on power quality, and ensures safe operation of electric equipment; the measurement and control and management equipment refines intelligent perception related data, monitors the running condition of the equipment in real time, and reduces potential safety hazards caused by faults of electric equipment; the electric network is mutually isolated from the electric equipment, and the insulation monitoring device monitors the insulation condition of the equipment in real time, so that the safety of the electric equipment and the human body is ensured. And thirdly,: the energy-saving and environment-friendly device has the advantages that the power factor is 0.95 larger when the device is in a rated working state, and the reactive power loss is greatly reduced; the equipment adopts a single-phase remote power supply technology, so that the core number and the wire diameter of the cable are reduced, and the wire loss is reduced; the energy consumption of the equipment is smaller, and the no-load energy consumption can be reduced. Fourth, it is: the system has the remote monitoring capability, and the measurement and control and management equipment can realize the interconnection and intercommunication of energy and information among the equipment through a power supply network and a communication network; intelligent sensing, pressure regulation and three-level remote regulation and control, and flexible control; asset digital management realizes intelligent operation maintenance. Fifth, it is: the cost is reduced, the reactive power loss is reduced, and the line cost and the electricity cost are saved; the cable adopts 2 core cable, and the cable diameter is thinner, saves construction cost greatly. Sixth, it: the system has the advantages of compatibility with new energy technology, green low carbon and flexible configuration, combines the advantages of photovoltaic and wind complementary power generation and remote power supply, preferentially adopts a photovoltaic and wind complementary power generation system to supply power, and can take power from commercial power as required under the condition of insufficient photovoltaic and wind complementary power generation; photovoltaic, wind power and energy storage batteries work cooperatively.
While the fundamental and principal features of the utility model and advantages of the utility model have been shown and described, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, the embodiments do not include only a single embodiment, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the embodiments in the examples may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
Claims (7)
1. A direct current remote power supply system comprises a plurality of power transformation and distribution stations with intervals distributed along the road; the power transformation and distribution substation is characterized in that each power transformation and distribution substation is matched with an AC/DC converter, a busbar, a left power supply arm, a right power supply arm, a contactor, a wind-solar power storage device and a measurement and control and management device; the contactor is provided with four sets, the power input end of the AC/DC converter is electrically connected with an alternating current power supply, and the power output end of the wind-solar power supply storage device is electrically connected with the power input end of the measurement and control and management device; the power output end of the AC/DC converter and the power output end of the measurement and control and management equipment are respectively and electrically connected with the power input ends of the first set of contactors and the second set of contactors, the power output ends of the first set of contactors and the second set of contactors are respectively and electrically connected with the two power input ends of the bus, and the two power output ends of the bus are respectively and electrically connected with the power input ends of the third set of contactors and the fourth set of contactors; the power output ends of the third set of contactor and the fourth set of contactor are respectively electrically connected with the power input ends of the left power supply arm and the right power supply arm, the power output ends of the left power supply arm and the right power supply arm are respectively electrically connected with the plurality of sets of direct current consumer ends along the highway, and an insulating section is electrically connected in series between every two adjacent power transformation and distribution stations, the power output end of the fourth set of contactor of the front power transformation and distribution station and the power output end of the third contactor of the rear power transformation and distribution station.
2. The direct current remote power supply system according to claim 1, wherein the incoming and outgoing terminals of the insulating section are electrically connected in parallel with a disconnecting switch or a circuit breaker, respectively.
3. The direct current remote power supply system according to claim 1, wherein the wind-solar power supply storage device comprises a wind power generator, a photovoltaic panel and a storage battery which are arranged along a highway, and a power output end of the wind power generator, a power input end of the storage battery are electrically connected in parallel.
4. The direct-current remote power supply system according to claim 1, wherein insulation monitoring devices are respectively arranged on positive and negative bus bars of a left power supply arm and a right power supply arm of the power transformation and distribution substation.
5. The direct current remote power supply system according to claim 1, wherein a bus distance between two adjacent power transformation and distribution stations is 15 to 25km; the distance between every two adjacent insulated sections between the power transformation and distribution stations is set to be 15-25 km.
6. The direct current remote power supply system according to claim 1, wherein the first contactor, the second contactor, the third contactor, and the fourth contactor are replaced with circuit breakers.
7. A dc remote power supply system according to claim 1, wherein the left side power supply arm and the right side power supply arm are each capable of being tapped from the bus bar by a multi-way contactor.
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| CN202320570999.8U CN219717937U (en) | 2023-03-22 | 2023-03-22 | Direct-current remote power supply system |
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