CN112332399A - A 220V two-electric two-charge multi-feed DC system - Google Patents
A 220V two-electric two-charge multi-feed DC system Download PDFInfo
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- CN112332399A CN112332399A CN202011147457.7A CN202011147457A CN112332399A CN 112332399 A CN112332399 A CN 112332399A CN 202011147457 A CN202011147457 A CN 202011147457A CN 112332399 A CN112332399 A CN 112332399A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for DC systems
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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
- H02J1/06—Two-wire systems
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
一种220V两电两充多馈直流系统，包括两套相互连接的直流系统1#和2#，每套直流系统包括一面直流充电屏、一组蓄电池模块和多面直流馈电屏，直流充电屏内设有与DC220V供电直流母线连接的两路供电断路器，直流馈电屏内设有两路连接断路器；直流馈电屏的两路连接断路器的其中一个与供电断路器之一连接，DC220V供电直流母线KM1+、KM1—和直流母线KM2+、KM2—通过串联的母联转换开关1ZK和2ZK连接。该系统可以实现两套直流系统之间方便快捷地连接和断开，通过在馈电屏上连接断路器和充电屏上的供电断路器，实现馈电屏和充电屏的快速安全连接或拆除，可以方便地不停电将1#直流系统中的馈电屏负荷转移到2#直流系统中，可以对1#直流系统内的部件进行安全脱离并更换或者保养。
A 220V two-electric, two-charge, multi-feed DC system, comprising two sets of interconnected DC systems 1# and 2#, each set of DC systems includes a DC charging screen, a set of battery modules and a multi-sided DC feeding screen, a DC charging screen There are two power supply circuit breakers connected to the DC220V power supply DC bus, and there are two connection circuit breakers in the DC feeder panel; one of the two connection circuit breakers of the DC feeder panel is connected to one of the power supply circuit breakers, DC220V power supply DC busbars KM1+, KM1- and DC busbars KM2+, KM2- are connected through series bus tie transfer switches 1ZK and 2ZK. The system can realize the convenient and quick connection and disconnection between the two sets of DC systems. By connecting the circuit breaker on the feeding screen and the power supply circuit breaker on the charging screen, the quick and safe connection or removal of the feeding screen and the charging screen can be realized. The load of the feeder screen in the 1# DC system can be easily transferred to the 2# DC system without power failure, and the components in the 1# DC system can be safely removed and replaced or maintained.
Description
Technical Field
The invention relates to the technical field of direct current systems of transformer substations, in particular to a 220V two-power two-charging multi-feed direct current system.
Background
The low-voltage DC system is used in hydraulic power plant, thermal power plant, transformer substation and other users using DC equipment, and is used as power supply equipment for providing DC power supply for signal equipment, protection, automatic equipment, emergency power supply, breaker on-off and switch-on. The direct current system is an independent power supply, is not influenced by a generator, plant power and a system operation mode, and ensures that a backup power supply (a storage battery) continuously provides important equipment of the direct current power supply under the condition that external alternating current is interrupted.
The direct current system usually provides power for monitoring and action parts such as signal equipment, protection, automatic devices and the like, and the normal production stable operation of the direct current system is important to the load of the power provided by the direct current system, therefore, when the direct current system is designed, two direct current buses are usually adopted for power supply (charging screens), the direct current bus power supply is connected through a bus tie switch (contact screen), one set of direct current bus power supply fails, the load can be connected with the other set of direct current bus by the bus tie switch to realize continuous power supply, the problem of power supply stability is well solved in the form, but power facilities need to be regularly checked, maintained and maintained, because the direct current buses are continuously electrified, the maintenance risk of the corresponding charging screens and the feeding screens is large, and therefore power failure is often needed to be maintained, and the loss of the load end of the power transformation system is large.
Chinese patent document CN 109995015a describes a 220KV two-power two-charging dc system, which uses two-in two-out incoming lines to effectively improve the reliability of the power supply, but the dc bus runs through the charging screen and the feeding screen, and when the replacement or maintenance operation is performed without shutdown, because the duration of the replacement is long, the dc bus of the detachable portion is exposed for a long time during the operation process, which becomes a dangerous potential safety hazard, and the replacement is performed in a live-line manner, which has a high technical requirement on the operator and a high operation risk.
Chinese patent document CN 109888765a describes a method for replacing a 220KV two-power-supply two-charging dc system without power cut, in which a new dc system can be installed in situ by replacing the two-power-supply two-charging dc system without power cut, and a bridge system, i.e., a temporary dc system, is omitted, so that the new system can be directly replaced. A large amount of manpower and material resources are saved, the power grid risk is reduced, and the power failure time is shortened. The change process is taken the liaison cabinet to taking the direct current system of liaison cabinet to change to old-fashioned, when later stage need be to new screen and the feed screen of charging maintain and maintain, and the operation when its dismantlement can not reach the operation position uncharged, and the risk is higher.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a 220V two-power two-charging multi-feed direct current system, which realizes convenient and fast connection and non-power-off disassembly between a feed screen and a charging screen on the premise of providing two sets of direct current power supplies to ensure the reliability of power supply, and is convenient to carry out fast maintenance or replacement of a cabinet body.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
A220V two-electricity two-charging multi-feed direct current system comprises two sets of direct current systems 1# and 2# which are connected with each other, wherein each set of direct current system comprises a direct current charging screen, a group of storage battery modules and a multi-surface direct current feed screen;
DC220V power supply direct current buses KM1+ and KM 1-are arranged in the 1# direct current charging screen CHC 1;
power supply circuit breakers 11K and 12K connected with DC220V power supply direct current buses KM1+ and KM1 are arranged in the 1# direct current charging screen CHC 1;
a direct-current breaker 11BK is arranged in the 1# direct-current charging screen CHC1, and the 1# storage battery module BATC1 is connected with a DC220V through the direct-current breaker 11BK to supply power to a direct-current bus KM1+ and KM 1-;
two paths of connecting circuit breakers are arranged in the No. 1 direct current feed screen DISC 1;
one of the two paths of connecting breakers of the 1# direct current feed screen DISC1 is connected with one of the power supply breakers 11K and 12K;
DC220V power supply direct current buses KM2 and KM2 are arranged in the 2# direct current charging screen CHC 2;
power supply circuit breakers 21K and 22K connected with DC220V power supply direct current buses KM2+ and KM 2-are arranged in the 2# direct current charging screen CHC 2;
a 2# direct-current charging screen CHC2 is internally provided with a direct-current breaker 21BK, and a 2# storage battery module BATC2 is connected with a DC220V through the direct-current breaker 21BK to supply power to a direct-current bus KM2+ and KM 2-;
two paths of connecting circuit breakers are arranged in the No. 2 direct current feed screen DISC 2;
one of the two paths of connecting breakers of the 2# direct current feed panel DISC2 is connected with one of the power supply breakers 21K and 22K;
DC220V power supply direct current bus KM1+, KM 1-and direct current bus KM2+, KM 2-are connected through series bus-coupled change-over switches 1ZK and 2 ZK.
In a preferred scheme, the 1# dc system includes 2 dc feed panels DISC1, each dc feed panel DISC1 is provided with two connecting breakers, and one of the two connecting breakers is connected to one of the power supply breakers 11K and 12K of the 1# dc charging panel CHC 1;
the 2# direct current system comprises 2 direct current feed screens DISC2, each direct current feed screen DISC2 is provided with two connecting circuit breakers, and one of the two connecting circuit breakers is connected with one of the power supply circuit breakers 21K and 22K of the 2# direct current charging screen CHC 2.
In an optimal scheme, the number of the direct current feed screens in the 1# or 2# direct current system is greater than or equal to 2, each direct current feed screen is provided with two paths of connection breakers, the number of the power supply breakers corresponding to the number of the 1# or 2# direct current charging screens corresponds to the number of the direct current feed screens, and one of the two paths of connection breakers of each direct current feed screen is connected with the power supply breaker.
A storage battery bus 1BAT + and 1 BAT-is arranged in the 1# storage battery module BATC 1;
two ends of the direct current breaker 11BK are respectively connected with a power supply direct current bus KM1+, KM 1-and a storage battery bus 1BAT +, 1 BAT-;
the 1# storage battery BAT1 is connected with the storage battery bus 1BAT + and 1 BAT-;
a storage battery bus 2BAT + and 2 BAT-is arranged in the 2# storage battery module BATC 2;
two ends of the direct current breaker 21BK are respectively connected with a power supply direct current bus KM2+, KM 2-and a storage battery bus 2BAT +, 2 BAT-;
the 2# secondary battery BAT2 is connected to the secondary battery bus 2BAT + and 2 BAT-.
The 1# direct-current charging screen CHC1 is internally provided with linkage direct-current change-over switches 11ZK1 and 11ZK2, the input ends of 11ZK1 and 11ZK2 are connected in parallel, the output end of 11ZK1 is connected with a DC220V power supply direct-current bus KM1+, KM1-, and the output end of 11ZK2 is connected with a storage battery bus 1BAT +, 1 BAT-;
the 1# direct-current charging screen CHC1 is internally provided with direct-current input buses 1L +, 1L-, 11ZK1 and 11ZK2, the parallel input ends of the direct-current input buses are connected with the direct-current input buses 1L +, 1L-, and the AD output end of the direct-current power supply module 1 is connected with the direct-current input buses 1L +, 1L-;
the 2# direct-current charging screen CHC2 is internally provided with linkage direct-current change-over switches 21ZK1 and 21ZK2, the input ends of 21ZK1 and 21ZK2 are connected in parallel, the output end of 21ZK1 is connected with a DC220V power supply direct-current bus KM2+, KM2-, and the output end of 21ZK2 is connected with a storage battery bus 2BAT +, 2 BAT-;
the 2# direct current charging screen CHC2 is internally provided with direct current input buses 2L +, 2L-, 21ZK1 and 21ZK2, the parallel input ends of the direct current input buses are connected with the direct current input buses 2L +, 2L-, and the AD output end of the direct current power supply module 2 is connected with the direct current input buses 2L +, 2L-.
The input end of the direct-current power supply module 1AD is connected with an alternating-current AC380V bus I, the alternating-current AC380V bus I is connected with alternating-current contactors 11KM and 12KM, the alternating-current contactors 11KM and 12KM are connected in an interlocking manner, and the alternating-current contactors 11KM and 12KM are respectively connected with the input end of 1# AC380V and the input end of 2# AC 380V;
the input end of the direct-current power supply module 2AD is connected with an alternating-current AC380V bus II, the alternating-current AC380V bus II is connected with alternating-current contactors 21KM and 22KM, the alternating-current contactors 21KM and 22KM are connected in an interlocking mode, and the alternating-current contactors 21KM and 22KM are respectively connected with the input end of a 3# AC380V and the input end of a 4# AC 380V.
Feed buses KM + and KM-are arranged in the 1# direct current feed screen DISC1 and the 2# direct current feed screen DISC2 and are connected with the power supply ends of the feeder lines, the two paths of connecting breakers are connected with the feed buses KM + and KM-, and a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 are connected between the feed buses KM + and KM-.
A microcomputer direct current monitoring module 11JK is arranged on the 1# direct current charging screen CHC1, the direct current monitoring module 11JK is connected with a 1# AC380V input end and a 2# AC380V input end, an output end of the direct current monitoring module 11JK is connected with alternating current contactors 11KM and 12KM, the direct current monitoring module 11JK is in communication connection with a direct current power supply module 1AD, and the direct current monitoring module 11JK is in communication connection with a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 through a bus;
the 2# direct current charging screen CHC2 is provided with a microcomputer direct current monitoring module 21JK, the direct current monitoring module 21JK is connected with a 3# AC380V input end and a 4# AC380V input end, the output end of the direct current monitoring module 21JK is connected with an alternating current contactor 21KM and a direct current contactor 22KM, the direct current monitoring module 21JK is in communication connection with a direct current power supply module 2AD, and the direct current monitoring module 21JK is in communication connection with a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 through buses.
The direct current monitoring module 11JK and the direct current monitoring module 21JK are in communication connection with the master controller.
The 1# battery module BATC1 is connected to a discharge bypass through a discharge breaker 11 FQ;
the 2# battery module BATC2 is connected to the discharge bypass via the discharge breaker 21 FQ.
The invention provides a 220V two-power two-charge multi-feed direct current system, which can realize convenient and quick connection and disconnection between two sets of direct current systems, realize quick and safe connection between a feed screen and a charge screen, realize quick and safe connection or disconnection between the feed screen and the charge screen by connecting a circuit breaker on the feed screen and a power supply circuit breaker on the charge screen, conveniently transfer the feed screen load in a 1# direct current system to a 2# direct current system without power outage, safely separate and replace or maintain components in the 1# direct current system, monitor the insulation and working states of the charge screen and the feed screen by a monitor, control the floating charge and the uniform charge of a storage battery by controlling an alternating current contactor at the input end of AC380V, ensure that the system is in a stable state, prolong the service life of a storage battery pack and reduce a branch bus, the silicon chain is eliminated, the system risk caused by the silicon chain failure is avoided, and the cost is reduced.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic circuit diagram of a system of the present invention;
FIG. 2 is a schematic diagram of a feed panel circuit;
FIG. 3 is a schematic diagram of a DC system communication link;
fig. 4 is a front view of the electric cabinet of the two-charging four-feeding system;
FIG. 5 is a schematic diagram of the back connection of the electric cabinet of the two-charging four-feeding system;
FIG. 6 is a schematic diagram of the electrical cabinet connection of the system of the present invention.
Detailed Description
As shown in fig. 1-5, a 220V two-charge multi-feed dc system includes two sets of interconnected dc systems 1# and 2#, each set of dc system including one dc charging screen, one set of battery modules, and multiple dc feed screens;
DC220V power supply direct current buses KM1+ and KM 1-are arranged in the 1# direct current charging screen CHC 1;
power supply circuit breakers 11K and 12K connected with DC220V power supply direct current buses KM1+ and KM1 are arranged in the 1# direct current charging screen CHC 1;
a direct-current breaker 11BK is arranged in the 1# direct-current charging screen CHC1, and the 1# storage battery module BATC1 is connected with a DC220V through the direct-current breaker 11BK to supply power to a direct-current bus KM1+ and KM 1-;
two paths of connecting circuit breakers are arranged in the No. 1 direct current feed screen DISC 1;
one of the two paths of connecting breakers of the 1# direct current feed screen DISC1 is connected with one of the power supply breakers 11K and 12K;
DC220V power supply direct current buses KM2 and KM2 are arranged in the 2# direct current charging screen CHC 2;
power supply circuit breakers 21K and 22K connected with DC220V power supply direct current buses KM2+ and KM 2-are arranged in the 2# direct current charging screen CHC 2;
a 2# direct-current charging screen CHC2 is internally provided with a direct-current breaker 21BK, and a 2# storage battery module BATC2 is connected with a DC220V through the direct-current breaker 21BK to supply power to a direct-current bus KM2+ and KM 2-;
two paths of connecting circuit breakers are arranged in the No. 2 direct current feed screen DISC 2;
one of the two paths of connecting breakers of the 2# direct current feed panel DISC2 is connected with one of the power supply breakers 21K and 22K;
DC220V power supply direct current bus KM1+, KM 1-is connected with direct current bus KM2+, KM 2-through series bus-coupled change-over switches 1ZK and 2 ZK;
the direct-current bus KM1+ and KM 1-are arranged in the charging screen and connected with an external load through a power supply breaker, controllable connection can be achieved through the power supply breaker, when power is needed to be supplied, the power supply breaker is switched on for power supply through a power supply short circuit, when maintenance or disassembly is carried out, the power supply breaker is disconnected, the rear end of the breaker is uncharged, and then cable disassembly work is carried out;
the series connection of the bus coupler change-over switch 1ZK and the bus coupler change-over switch 2ZK, when the 1ZK and the 2ZK are switched on simultaneously, the 1# direct current system and the 2# direct current system are connected, the power supply of two sets of direct current systems can be realized, one of the bus coupler switches is disconnected, the 1# direct current system and the 2# direct current system are connected and disconnected, compared with the two sets of direct current systems which are independently connected by the two bus coupler switches, the operation is simpler and faster, at ordinary times, one bus coupler switch is switched on, the other bus coupler switch is disconnected, and only one-time operation is needed when the direct current systems are connected and disconnected.
The preferred scheme is as shown in fig. 1, the above-mentioned # 1 dc system includes 2 dc feed screens DISC1, each dc feed screen DISC1 is provided with two connecting breakers, the connecting breaker 13K of the i-stage dc feed screen 1 is connected to the power supply breaker 11K of the # 1 dc charging screen CHC1, and the connecting breaker 15K of the i-stage dc feed screen 2 is connected to the power supply breaker 12K of the # 1 dc charging screen CHC 1;
the 2# direct current system comprises 2 direct current feed screens DISC2, wherein each direct current feed screen DISC2 is provided with two connecting breakers, the connecting breaker 23K of the II sections of direct current feed screens 1 is connected with the power supply breaker 21K of the 2# direct current charging screen CHC2, and the connecting breaker 25K of the II sections of direct current feed screens 2 is connected with the power supply breaker 22K of the 2# direct current charging screen CHC 2;
the direct current feed screen is connected with the circuit breaker in two ways, one way is connected with the power supply circuit breaker to provide power for a feeder load, the other way is normally open and serves as a standby, when the connected charging screen needs maintenance or replacement, the standby connection circuit breaker is connected with the other feed screen or the charging screen, then the connection between the original connection circuit breaker and the power supply circuit breaker is disconnected, the feed screen and the charging screen are disconnected, the feed screen is electrified in the whole process of disconnecting the charging screen, but the wiring and disconnecting operations are all operated at the end where the connection circuit breaker and the power supply circuit breaker are not electrified, and the safety is high;
two paths of power supply breakers of the direct current feed screen are respectively connected with the 2 direct current feed screens, so that the connection and disconnection between the feed screen load and the direct current bus of the charging screen can be controlled through the power supply breakers and the connection breakers, the feed screen can conveniently convert the load between a 1# direct current system and a 2# direct current system, and the feed screen can also be converted.
In a preferred scheme, the number of the direct current feed screens in the 1# or 2# direct current system is greater than or equal to 2, each direct current feed screen is provided with two paths of connecting breakers, the number of the power supply breakers corresponding to the number of the 1# or 2# direct current charging screens corresponds to the number of the direct current feed screens, and one of the two paths of connecting breakers of each direct current feed screen is connected with the power supply breaker;
through set up the power supply circuit breaker that equals with this direct current system internal feed screen quantity on charging the screen, can keep charging the screen and be connected with feed screen all the time, feed screen can convenient conversion load simultaneously.
As shown in fig. 1, a battery bus 1BAT + and 1 BAT-is arranged in the 1# battery module BAT 1;
two ends of the direct current breaker 11BK are respectively connected with a power supply direct current bus KM1+, KM 1-and a storage battery bus 1BAT +, 1 BAT-;
the 1# storage battery BAT1 is connected with the storage battery bus 1BAT + and 1 BAT-;
a storage battery bus 2BAT + and 2 BAT-is arranged in the 2# storage battery module BATC 2;
two ends of the direct current breaker 21BK are respectively connected with a power supply direct current bus KM2+, KM 2-and a storage battery bus 2BAT +, 2 BAT-;
the 2# storage battery BAT2 is connected with the storage battery bus 2BAT + and 2 BAT-;
connection control between the storage battery pack and the direct current bus can be achieved through the direct current circuit breakers 11BK and 21BK, when the storage battery pack needs to be replaced or connection between the storage battery pack and the charging screen is disconnected, the corresponding direct current circuit breaker 11BK or 21BK is disconnected, and then the storage battery is detached.
As shown in fig. 1, the 1# DC charging screen CHC1 is internally provided with linked DC transfer switches 11ZK1 and 11ZK2, the input ends of 11ZK1 and 11ZK2 are connected in parallel, the output end of 11ZK1 is connected with DC220V to supply power to the DC bus KM1+, KM1-, and the output end of 11ZK2 is connected with the battery bus 1BAT +, 1 BAT-;
the 1# direct-current charging screen CHC1 is internally provided with direct-current input buses 1L +, 1L-, 11ZK1 and 11ZK2, the parallel input ends of the direct-current input buses are connected with the direct-current input buses 1L +, 1L-, and the AD output end of the direct-current power supply module 1 is connected with the direct-current input buses 1L +, 1L-;
the 2# direct-current charging screen CHC2 is internally provided with linkage direct-current change-over switches 21ZK1 and 21ZK2, the input ends of 21ZK1 and 21ZK2 are connected in parallel, the output end of 21ZK1 is connected with a DC220V power supply direct-current bus KM2+, KM2-, and the output end of 21ZK2 is connected with a storage battery bus 2BAT +, 2 BAT-;
the 2# direct current charging screen CHC2 is internally provided with direct current input buses 2L +, 2L-, 21ZK1 and 21ZK2, the parallel input ends of the direct current input buses are connected with the direct current input buses 2L +, 2L-, and the AD output end of the direct current power supply module 2 is connected with the direct current input buses 2L +, 2L-.
The input end of the direct-current power supply module 1AD is connected with an alternating-current AC380V bus I, the alternating-current AC380V bus I is connected with alternating-current contactors 11KM and 12KM, the alternating-current contactors 11KM and 12KM are connected in an interlocking manner, and the alternating-current contactors 11KM and 12KM are respectively connected with the input end of 1# AC380V and the input end of 2# AC 380V;
the input end of the direct-current power supply module 2AD is connected with an alternating-current AC380V bus II, the alternating-current AC380V bus II is connected with alternating-current contactors 21KM and 22KM, the alternating-current contactors 21KM and 22KM are connected in an interlocking manner, and the alternating-current contactors 21KM and 22KM are respectively connected with the input end of a 3# AC380V and the input end of a 4# AC 380V;
two input ends are arranged at the input of the alternating current AC380V, and the power supply connection of the input ends is controlled through interlocking, so that when one of the input ends is lost, the other input end can be switched on to supply power, and the power supply stability is improved.
As shown in fig. 2, 3 and 5, feeding buses KM + and KM-are arranged in the 1# dc feeding panel DISC1 and the 2# dc feeding panel DISC2, the feeding buses KM + and KM-are connected to the feeding terminals of the feeders, two connecting breakers are connected to the feeding buses KM + and KM-, and a feeder monitoring module MI10 and a feeder insulation monitoring module INS10 are connected between the feeding buses KM + and KM-.
As shown in fig. 3, a microcomputer dc monitoring module 11JK is disposed on the 1# dc charging screen CHC1, the dc monitoring module 11JK is connected to the 1# AC380V input end and the 2# AC380V input end, the dc monitoring module 11JK output end is connected to the AC contactors 11KM and 12KM, the dc monitoring module 11JK is in communication connection with the dc power module 1AD, and the dc monitoring module 11JK is in communication connection with the feeder line monitoring module MI10 and the feeder line insulation monitoring module INS10 through a bus;
a microcomputer direct current monitoring module 21JK is arranged on the 2# direct current charging screen CHC2, the direct current monitoring module 21JK is connected with a 3# AC380V input end and a 4# AC380V input end, the output end of the direct current monitoring module 21JK is connected with alternating current contactors 21KM and 22KM, the direct current monitoring module 21JK is in communication connection with a direct current power supply module 2AD, and the direct current monitoring module 21JK is in communication connection with a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 through buses;
bus voltage, bus current, storage battery voltage and current state can be monitored through microcomputer direct current monitoring module 21JK, direct current power module is controlled to adopt the mode of floating charge or equalizing charge to the storage battery to charge, the detecting system is insulating, whether change floating charge is decided according to whether the charging current and the equalizing charge time of gathering reach the equalizing charge limit time of settlement, can carry out automatic control to the charge-discharge of battery, and is intelligent high.
The direct current monitoring module 11JK and the direct current monitoring module 21JK are in communication connection with a main monitoring controller, and the real-time state of each part of the direct current system can be monitored through the main monitoring controller.
The 1# battery module BATC1 is connected to a discharge bypass through a discharge breaker 11 FQ;
the 2# battery module BATC2 is connected with a discharging bypass through the discharging breaker 21FQ, and when the battery needs to be disassembled or maintained, the discharging bypass can discharge the battery.
As shown in fig. 6, by arranging multiple power supply circuit breakers in the dc charging panel, two link circuit breakers are arranged on each feeding panel, the power supply circuit breaker 11K of the first-stage dc charging panel is connected to the connection circuit breaker 15K of the first-stage feeding panel 2, the power supply circuit breaker 12K of the first-stage dc charging panel is connected to the connection circuit breaker 13K of the first-stage feeding panel 1, the power supply circuit breaker 21K of the second-stage dc charging panel is connected to the connection circuit breaker 25K of the second-stage feeding panel 2, and the power supply circuit breaker 22K of the second-stage dc charging panel is connected to the connection circuit breaker 23K of the second-stage feeding panel 1;
when I section direct current charging screen need maintain or change, earlier 14K and 24K, 16K and 26K are connected with the cable, this moment because 14K, 24K, 16K, 26K all is in the off-state, the operation is uncharged during the operation, convenient and fast, then 14K, 24K, 16K, 26K combined floodgate, later with circuit breaker 11K, 15K, 12K, 13K disconnection, at this moment, between 11K and 15K, the cable is uncharged between 12K and 13K, demolish the cable and both can wholly demolish I section direct current charging screen, the operation of whole process is uncharged, safe and fast demolishs, also there is not exposed bus after the completion, potential safety hazard greatly reduced.
Claims (10)
1. The utility model provides a two electric two of 220V fill and feed DC system more, includes two sets of interconnect's DC system 1# and 2#, and every set of DC system includes that a direct current charges and shields, a set of battery module and multiaspect direct current feed screen, its characterized in that:
DC220V power supply direct current buses KM1+ and KM 1-are arranged in the 1# direct current charging screen CHC 1;
power supply circuit breakers 11K and 12K connected with DC220V power supply direct current buses KM1+ and KM1 are arranged in the 1# direct current charging screen CHC 1;
a direct-current breaker 11BK is arranged in the 1# direct-current charging screen CHC1, and the 1# storage battery module BATC1 is connected with a DC220V through the direct-current breaker 11BK to supply power to a direct-current bus KM1+ and KM 1-;
two paths of connecting circuit breakers are arranged in the No. 1 direct current feed screen DISC 1;
one of the two paths of connecting breakers of the 1# direct current feed screen DISC1 is connected with one of the power supply breakers 11K and 12K;
DC220V power supply direct current buses KM2 and KM2 are arranged in the 2# direct current charging screen CHC 2;
power supply circuit breakers 21K and 22K connected with DC220V power supply direct current buses KM2+ and KM 2-are arranged in the 2# direct current charging screen CHC 2;
a 2# direct-current charging screen CHC2 is internally provided with a direct-current breaker 21BK, and a 2# storage battery module BATC2 is connected with a DC220V through the direct-current breaker 21BK to supply power to a direct-current bus KM2+ and KM 2-;
two paths of connecting circuit breakers are arranged in the No. 2 direct current feed screen DISC 2;
one of the two paths of connecting breakers of the 2# direct current feed panel DISC2 is connected with one of the power supply breakers 21K and 22K;
DC220V power supply direct current bus KM1+, KM 1-and direct current bus KM2+, KM 2-are connected through series bus-coupled change-over switches 1ZK and 2 ZK.
2. The 220V two-electric two-charging multi-feed direct current system as claimed in claim 1, wherein the No. 1 direct current system comprises 2 direct current feed panels DISC1, each direct current feed panel DISC1 is provided with two-way connection breakers, and one of the two-way connection breakers is connected with one of power supply breakers 11K and 12K of a No. 1 direct current charging panel CHC 1;
the 2# direct current system comprises 2 direct current feed screens DISC2, each direct current feed screen DISC2 is provided with two connecting circuit breakers, and one of the two connecting circuit breakers is connected with one of power supply circuit breakers 21K and 22K of the 2# direct current charging screen CHC 2.
3. The 220V two-power two-charge multi-feed direct-current system according to claim 1, wherein the number of direct-current feed screens in the No. 1 or No. 2 direct-current system is greater than or equal to 2, each direct-current feed screen is provided with two-way connection breakers, the number of power supply breakers corresponding to the number of the No. 1 or No. 2 direct-current feed screens corresponds to the number of direct-current feed screens, and one of the two-way connection breakers of each direct-current feed screen is connected with the power supply breaker.
4. A 220V two-charge multi-feed dc system according to either of claims 2 or 3, wherein:
a storage battery bus 1BAT + and 1 BAT-is arranged in the 1# storage battery module BATC 1;
two ends of the direct current breaker 11BK are respectively connected with a power supply direct current bus KM1+, KM 1-and a storage battery bus 1BAT +, 1 BAT-;
the 1# storage battery BAT1 is connected with the storage battery bus 1BAT + and 1 BAT-;
a storage battery bus 2BAT + and 2 BAT-is arranged in the 2# storage battery module BATC 2;
two ends of the direct current breaker 21BK are respectively connected with a power supply direct current bus KM2+, KM 2-and a storage battery bus 2BAT +, 2 BAT-;
the 2# storage battery BAT2 is connected with the storage battery bus 2BAT + and 2 BAT-.
5. The 220V two-charge multi-feed dc system according to claim 4, wherein:
the 1# direct-current charging screen CHC1 is internally provided with linkage direct-current change-over switches 11ZK1 and 11ZK2, the input ends of 11ZK1 and 11ZK2 are connected in parallel, the output end of 11ZK1 is connected with a DC220V power supply direct-current bus KM1+, KM1-, and the output end of 11ZK2 is connected with a storage battery bus 1BAT +, 1 BAT-;
the 1# direct-current charging screen CHC1 is internally provided with direct-current input buses 1L +, 1L-, 11ZK1 and 11ZK2, the parallel input ends of the direct-current input buses are connected with the direct-current input buses 1L +, 1L-, and the AD output end of the direct-current power supply module 1 is connected with the direct-current input buses 1L +, 1L-;
the 2# direct-current charging screen CHC2 is internally provided with linkage direct-current change-over switches 21ZK1 and 21ZK2, the input ends of 21ZK1 and 21ZK2 are connected in parallel, the output end of 21ZK1 is connected with a DC220V power supply direct-current bus KM2+, KM2-, and the output end of 21ZK2 is connected with a storage battery bus 2BAT +, 2 BAT-;
a parallel input end of a direct current input bus 2L +, 2L-, 21ZK1 and 21ZK2 is connected with the direct current input bus 2L +, 2L-in the 2# direct current charging screen CHC2, and an AD output end of a direct current power supply module 2 is connected with the direct current input bus 2L +, 2L-.
6. The 220V two-charge multi-feed dc system according to claim 5, wherein:
the input end of the direct-current power supply module 1AD is connected with an alternating-current AC380V bus I, the alternating-current AC380V bus I is connected with alternating-current contactors 11KM and 12KM, the alternating-current contactors 11KM and 12KM are connected in an interlocking mode, and the alternating-current contactors 11KM and 12KM are respectively connected with the input end of a 1# AC380V and the input end of a 2# AC 380V;
the input end of the direct-current power supply module 2AD is connected with an alternating-current AC380V bus II, the alternating-current AC380V bus II is connected with alternating-current contactors 21KM and 22KM, the alternating-current contactors 21KM and 22KM are connected in an interlocking mode, and the alternating-current contactors 21KM and 22KM are respectively connected with the input end of a 3# AC380V and the input end of a 4# AC 380V.
7. The 220V two-charge multi-feed dc system according to claim 6, wherein: feed buses KM + and KM-are arranged in the 1# direct current feed screen DISC1 and the 2# direct current feed screen DISC2 and are connected with the power supply ends of all the feeder lines, the two paths of connecting breakers are connected with the feed buses KM + and KM-, and a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 are connected between the feed buses KM + and KM-.
8. The 220V two-charge multi-feed dc system according to claim 7, wherein: the 1# direct-current charging screen CHC1 is provided with a microcomputer direct-current monitoring module 11JK, the direct-current monitoring module 11JK is connected with a 1# AC380V input end and a 2# AC380V input end, the output end of the direct-current monitoring module 11JK is connected with alternating-current contactors 11KM and 12KM, the direct-current monitoring module 11JK is in communication connection with a direct-current power supply module 1AD, and the direct-current monitoring module 11JK is in communication connection with a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 through a bus;
the 2# direct current charging screen CHC2 is provided with a microcomputer direct current monitoring module 21JK, the direct current monitoring module 21JK is connected with a 3# AC380V input end and a 4# AC380V input end, the output end of the direct current monitoring module 21JK is connected with an alternating current contactor 21KM and a direct current contactor 22KM, the direct current monitoring module 21JK is in communication connection with a direct current power supply module 2AD, and the direct current monitoring module 21JK is in communication connection with a feeder line monitoring module MI10 and a feeder line insulation monitoring module INS10 through buses.
9. The 220V two-charge multi-feed dc system according to claim 7, wherein: the direct current monitoring module 11JK and the direct current monitoring module 21JK are in communication connection with the master controller.
10. The 220V two-charge multi-feed dc system according to claim 1, wherein: the 1# storage battery module BATC1 is connected with a discharging bypass through a discharging breaker 11 FQ;
the 2# storage battery module BATC2 is connected with a discharging bypass through a discharging breaker 21 FQ.
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