CN111284354A

CN111284354A - Charging system and charging method

Info

Publication number: CN111284354A
Application number: CN202010180709.XA
Authority: CN
Inventors: 马超; 周一心; 刘国鹏; 顾进飞; 郭旭阳; 余静
Original assignee: Nanjing Nengrui Electric Power Technology Co ltd
Current assignee: Nanjing Nengrui Electric Power Technology Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-06-16

Abstract

The invention discloses a charging system and a charging method, wherein the charging system comprises a plurality of charging modules which are arranged in parallel; each charging module comprises a plurality of direct current output loops; the plurality of charging modules at least comprise a first charging module and a second charging module, the first charging module comprises M first direct current output loops, and the second charging module comprises N second direct current output loops; the charging system also comprises a parallel switch module which comprises P parallel switches, wherein P is more than or equal to 1 and less than or equal to MIN [ M, N ]; at least one first direct current output circuit is connected with a second direct current output circuit through a parallel switch. Through setting up the direct current output circuit between the different modules that charge and connect through parallel switch, realize the power output of different direct current output circuit flexibility relatively, realize simultaneously that the charging power between the different modules that charge coordinates, promotes charging system's charge efficiency.

Description

Charging system and charging method

Technical Field

The embodiment of the invention belongs to the technical field of electric automobiles and charging, and particularly relates to a charging system and a charging method.

Background

With the widespread use of electric vehicles, the construction of charging stations has been rapidly developed. In order to meet the requirement of electric vehicles for quick charging energy, the main technical approaches are to improve the output power of a charger and flexibly schedule the power grid power by a charging station.

At present, a charging station generally comprises a plurality of charging piles (charging terminals), and each charging pile is connected with a transformer to independently charge the electric automobile. When the demand of partial electric automobile charging power is higher, the capacity that the transformer substation provided is rich simultaneously, when having idle electric pile of filling, because the different electric piles are independent, can't carry out charging power transmission, consequently both can't satisfy higher charging demand, cause charging station power idle again, reduced the profitability of charge efficiency and charging station. If the capacity expansion of the charging station is increased by adding the transformer, the power coordination between the two transformers cannot be realized.

In the prior art, most manufacturers adopt matrix structure switches to distribute power at the position of an AC/DC output interface of a charger, but when power is adjusted each time, the number of corresponding DC output switches is large and the actions are frequent, so that the service life of devices and the reliability of the whole machine are reduced. In view of the above problems, there are presently disclosed solutions, and the principles and disadvantages thereof will be briefly described herein.

Patents CN201710858153.3 and cn201710833537.x adopt an annular output structure, the number of dc output switches is reduced, the flexibility of output power is slightly improved, but the output end shares an annular bus, and the output interface has no switch isolation, so that electrical isolation cannot be realized, the power consumption safety of the charging end is reduced, and the power coordination function after the transformer is added cannot be realized.

Patent CN201810084139.7 is based on the improvement of loop configuration, has promoted the output interface flexibility, nevertheless has the output to have equally and does not have electrical isolation, and the security when charging end overhauls is not enough, need close charging system during the maintenance, has reduced charging system work efficiency, also can not realize increasing the power coordination function behind the transformer simultaneously. And when output terminals are more (more than 4), compared with the traditional matrix structure, the number of the direct current switches is not obviously reduced, the control of the direct current switches becomes more complex, the reliability of the charging system is reduced, and the technical and cost advantages are not provided.

Disclosure of Invention

In view of this, embodiments of the present invention provide a charging system and a charging method, which implement relatively flexible power output of different dc output circuits and implement power coordination between different charging modules by adding a parallel switch unit.

In a first aspect, an embodiment of the present invention provides a charging system, including a plurality of charging modules, where the plurality of charging modules are arranged in parallel; each charging module comprises a plurality of direct current output loops;

the plurality of charging modules at least comprise a first charging module and a second charging module, the first charging module comprises M first direct current output loops, the second charging module comprises N second direct current output loops, M is more than or equal to 1 and is an integer, N is more than or equal to 1 and is an integer;

the charging system further comprises a parallel switch module, wherein the parallel switch module comprises P parallel switches, P is more than or equal to 1 and less than or equal to MIN [ M, N ], P is an integer, and MIN [ M, N ] represents the smaller of M and N;

there is at least one of said first dc output circuits connected to one of said second dc output circuits through one of said parallel switches.

Optionally, the number of the dc output loops included in each charging module is the same, and is equal to the number of the parallel switches included in the parallel switch module;

the ith direct current output loop is connected with the ith second direct current output loop through the ith parallel switch, wherein i is more than or equal to 1 and less than or equal to M, and i is an integer.

Optionally, each charging module comprises a split internal unit and a plurality of split external units, and the split internal unit comprises a rectifying unit and a direct current output switch unit;

the rectifying unit comprises a plurality of alternating current-direct current power subunits, and the direct current output switch unit comprises a plurality of direct current output switches;

the alternating current-direct current power subunits correspond to and are connected with the direct current output switches one by one, and the direct current output switches correspond to and are connected with the split outdoor units one by one; the alternating current-direct current power subunit, the direct current output switch and the split external unit form the direct current output loop.

Optionally, each charging module further includes a dc output unit;

the direct current output unit comprises a plurality of direct current switches and a connecting bus, the direct current switches are arranged on the connecting bus in series to form an annular bus, and one direct current switch is arranged between any two adjacent direct current feedback paths and between the last direct current feedback path and the first direct current feedback path.

Optionally, a first power supply unit and a second power supply unit are further arranged in the split internal machine;

the first power supply unit is used for supplying power to the alternating current-direct current power subunit, and the second power supply unit is used for supplying power to the direct current output switch unit and the direct current switch.

Optionally, the split external unit includes disconnecting links, and the disconnecting links correspond to and are connected to the dc output switches one to one;

the knife switch is used for cutting off the electrical connection between the split outer machine and the split inner machine when the split outer machine is maintained.

Optionally, the split internal machine further comprises an alternating current power supply, a lightning protection unit, an alternating current switch, a circuit breaker and an alternating current contactor;

the split external unit further comprises an electricity acquisition unit and a fuse.

In a second direction, an embodiment of the present invention further provides a charging method applied to the charging system in the first aspect, where the charging method includes:

acquiring charging demand data of a terminal to be charged corresponding to each direct current output loop, wherein the charging demand data comprises a charging power demand;

judging whether the charging power requirement is larger than the maximum output power of the direct current output loop;

when the charging power demand information is larger than the maximum output power, judging whether another direct current output loop connected with the direct current output loop through the parallel switch is idle and available;

and when the other direct current output loop connected with the direct current output loop through the parallel switch is idle, controlling the parallel switch to be closed so as to enable the other direct current output loop and the direct current output loop to charge the terminal to be charged together.

Optionally, each charging module further includes a dc output unit;

the direct current output unit comprises a plurality of direct current switches and a connecting bus, the direct current switches are arranged on the connecting bus in series to form an annular bus, and one direct current switch is arranged between any two adjacent direct current feedback paths and between the last direct current feedback path and the first direct current feedback path;

after determining whether the charging power requirement information is greater than the maximum output power of the dc output loop, the method further includes:

when the charging power demand information is larger than the maximum output power, judging whether at least one other direct current output loop connected with the direct current output loop through the direct current switch is idle and available;

and when the direct current output loop connected with the direct current output loop through the direct current switch is idle, controlling the direct current switch to be closed so as to enable at least one other direct current output loop and the direct current output loop to charge the terminal to be charged together.

Optionally, the determining whether at least one other dc output loop connected to the dc output loop through the dc switch is idle and available includes:

judging whether at least one adjacent direct current output loop connected with the direct current output loop through the direct current switch is idle and available;

when a dc output loop connected to the dc output loop through the dc switch is idle, controlling the dc switch to be closed, so that at least one other dc output loop and the dc output loop charge the terminal to be charged together, including:

when at least one adjacent direct current output loop connected with the direct current output loop through the direct current switch is idle, the direct current switch is controlled to be closed, so that the at least one adjacent direct current output loop and the direct current output loop jointly charge the terminal to be charged.

According to the charging system and the charging method provided by the embodiment of the invention, the parallel switch module is additionally arranged, and the direct current output loops among different charging modules are connected through the parallel switch in the parallel switch module, so that the relatively flexible power output of different direct current output loops can be realized, the coordinated distribution of the charging power among different charging modules can be realized, and the charging efficiency of the charging system can be improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present invention;

fig. 2 is an electrical schematic diagram of a charging system according to an embodiment of the present invention;

fig. 3 is an electrical schematic diagram of another charging system provided by an embodiment of the invention;

fig. 4 is a schematic flowchart of a charging method according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of another charging method according to an embodiment of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.

Fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present invention, and fig. 2 is a schematic electrical schematic diagram of the charging system according to the embodiment of the present invention, as shown in fig. 1 and fig. 2, a charging system 100 according to an embodiment of the present invention includes a plurality of charging modules 10, and the plurality of charging modules 10 are arranged in parallel; each charging module 10 comprises a plurality of dc output circuits 101; the plurality of charging modules at least comprise a first charging module 10A and a second charging module 10B, wherein the first charging module 10A comprises M first direct current output loops 101A, the second charging module comprises N second direct current output loops 101B, M is more than or equal to 1 and is an integer, N is more than or equal to 1 and is an integer; the charging system 100 further comprises a parallel switch module 20, the parallel switch module 20 comprising P parallel switches 201, wherein P is greater than or equal to 1 and less than or equal to MIN [ M, N ], and P is an integer, MIN [ M, N ] represents the smaller of M and N; at least one first dc output circuit 101A is connected to a second dc output circuit 101B via a parallel switch 201.

Illustratively, as shown in fig. 1 and fig. 2, the charging system 100 according to the embodiment of the present invention includes a plurality of charging modules 10, where the plurality of charging modules 10 are arranged in parallel, and two adjacent charging modules 10 are connected by a parallel switch module 20. Specifically, the plurality of charging modules at least include a first charging module 10A and a second charging module 10B shown in fig. 1, at least one first dc output circuit 101A in the first charging module 10A is connected to one second dc output circuit 101B in the second charging module 10B through a parallel switch 201, so that when the parallel switch 201 is closed, the output power of the first dc output circuit 101A can be distributed to the second dc output circuit 101B connected to the first dc output circuit 101A through the parallel switch 201, and meanwhile, the output power of the second dc output circuit 101B can also be distributed to the first dc output circuit 101A connected to the second dc output circuit through the parallel switch 201, so that the charging power output by different dc output circuits 101 can be adjusted, and different charging requirements can be met; meanwhile, the power redistribution readjustment among different charging modules 10 can be realized, and the charging efficiency of the charging system is improved; meanwhile, the universality of the charging system is improved, and the charging requirements of various different terminals to be charged can be met.

Further, the number of the dc output loops 101 in each charging module 10 may be the same or different, for example, when the first charging module 10A includes M first dc output loops 101A and the second charging module 10B includes N second dc output loops 101B, M is a positive integer greater than or equal to 1, N is a positive integer greater than or equal to 1, M may be equal to N or may not be equal to N, which is not limited in the embodiment of the present invention. Further, the number of the parallel switches 201 included in the parallel switch module 20 may be smaller than both the number of the first dc output circuits 101A and the number of the second dc output circuits 101B, for example, when P parallel switches are included in the parallel switch module 20, P is a positive integer greater than or equal to 1, and P is smaller than the smaller of M and N, so as to ensure that each parallel switch 201 is connected to one first dc output circuit 101A and one second dc output circuit 101B, and ensure that at least one connection path of the first dc output circuit 101A, the parallel switch 201, and the second dc output circuit 101B exists, and ensure that the power between the first charging module 10A and the second charging module 10B is adjustable and distributable. To sum up, the charging module provided in the embodiment of the present invention, by adding the parallel switch module, sets the dc output circuits between different charging modules to be connected through the parallel switch in the parallel switch module, and by using the parallel switch module structure, can apply the dc output circuit corresponding to the idle load to other loads with requirements, so as to meet the requirements of multi-load low-power output and low-load high-power output, avoid the power of the charging system from being idle, improve the utilization rate of the charging device, and is particularly suitable for loads with various power requirements, such as a bus charging station, a logistics charging station, and the like.

Optionally, the number of the dc output loops 101 included in each charging module 10 may be the same and equal to the number of the parallel switches in the parallel switch module 20, the ith first dc output loop 101A is connected to the ith second dc output loop 101B through the ith parallel switch 201, where i is greater than or equal to 1 and less than or equal to M, and i is an integer.

For example, the number of the first dc output circuit 101A, the second dc output circuit 101B and the parallel switch 201 is the same, thus, each first DC output circuit 101A is connected to a second DC output circuit 101B via a parallel switch 201, in this way, the output power of each first dc output circuit 101A in the first charging module 10A can be adjusted and redistributed through one second dc output circuit 101B of the second charging module 10B, meanwhile, the output power of each second dc output circuit 101B in the second charging module 10B can also be adjusted and redistributed through one first dc output circuit 101A of the first charging module 10A, so as to ensure that the charging output power of each dc output circuit 101 in the whole charging system 100 can be adjusted, the charging system can meet different charging requirements of the terminal, and meanwhile, the utilization efficiency of the charging system can be improved.

It should be noted that, in the embodiment of the present invention, only the ith first dc output circuit 101A is connected to the ith second dc output circuit 101B through the ith parallel switch 201, that is, the first dc output circuit 101A is connected to the first 1 second dc output circuit 101B through the first parallel switch 201, the second first dc output circuit 101A is connected to the second dc output circuit 101B through the second parallel switch 201, … …, and the pth first dc output circuit 101A is connected to the pth second dc output circuit 101B through the pth parallel switch 201. However, the connection relationship in the embodiment of the present invention is not limited, and for example, the first dc output circuit 101A may be connected to the last second dc output circuit 101B via the first parallel switch 201, and the second first dc output circuit 101A may be connected to the second last dc output circuit 101B via the second parallel switch 201. In the embodiment of the present invention, how the first dc output circuit 101A and the second dc output circuit 101B are connected through the parallel switch 201 is not limited, and it is only necessary to ensure that the parallel switch 201 can be connected to two corresponding dc output circuits 101 in the first charging module 10A and the second charging module 10B, and it is only necessary to ensure that the power between the first charging module 10A and the second charging module 10B is adjustable and distributable.

Optionally, with continued reference to fig. 1, each charging module 10 includes a split internal unit 10-1 and a plurality of split external units 10-2, and the split internal unit 10-1 includes a rectifying unit 102 and a dc output switch unit 103; the rectifying unit 102 comprises a plurality of ac-dc power sub-units 1021, and the dc output switching unit 103 comprises a plurality of dc output switches 1031; the alternating current-direct current power subunit 1021 is in one-to-one correspondence and connection with the direct current output switches 1031, and the direct current output switches 1031 are in one-to-one correspondence and connection with the split outdoor unit 10-2; the ac-dc power subunit 1021, the dc output switch 1031, and the split outdoor unit 10-2 form a dc output circuit 101.

Illustratively, one charging module 10 comprises a split inner machine 10-1 and a plurality of split outer machines 10-2, and the split inner machine 10-1 and the split outer machines 10-2 are connected by cables. As shown in fig. 1, the ac-dc power subunit 1021 and the dc output switches 1031 are in one-to-one correspondence and connected, the dc output switches 1031 and the split outdoor unit 10-2 are in one-to-one correspondence and connected, and the ac-dc power subunit 1021, the dc output switches 1031 and the split outdoor unit 10-2 form a dc output loop 101, which can charge a terminal to be charged.

Furthermore, in the embodiment of the present invention, the dc output switch unit 103 for controlling whether the load is connected or not is disposed in the split internal machine 10-1, so as to improve the continuity of the dc electrical circuit in the split internal machine 10-1. When the charging system is in a non-charging state, the direct current output switch 1031 in the direct current output switch unit 103 is turned off, the split external unit 10-2 has no direct current voltage, only has a 220V alternating current input power supply and a direct current power supply below 24V, and belongs to a safety level voltage, so that the risk that the split external unit 10-2 still has a high-voltage power supply in the non-charging state is avoided, and the safety of the charging system is improved.

Optionally, the rectifying unit 103 is composed of a plurality of ac-dc power sub-units 1031, each ac-dc power sub-unit 1031 is composed of a plurality of rectifying modules, and the power of the commonly used ac-dc power sub-unit 1031 is between 30kW and 80 kW.

Alternatively, the parallel switch module 20 may be placed within the split internal machine 10-1.

Optionally, as shown in fig. 1 and fig. 2, each charging module 10 provided in the embodiment of the present invention may further include a dc output unit 104; the dc output unit 104 includes a plurality of dc switches 1041 and a connecting bus 1042, the plurality of dc switches 1041 are serially connected to the connecting bus 1042 to form an annular bus, and a dc switch 1041 is disposed between any two adjacent dc input return paths 101 and between the last dc input return path 101 and the first dc input return path 101.

For example, as shown in fig. 2, the dc output unit 104 is disposed in the split internal unit 10-1 of each charging module 10, and a dc switch 1041 is disposed between any two adjacent dc output loops 101 and between the last dc output loop 101 and the first dc output loop 101, so that, inside each charging module 10, the output power on different dc output loops 101 can be adjusted through the dc output unit 104, the relatively flexible power output of different dc output loops is realized, and the charging efficiency of the charging system is improved at the same time. For example, after charging of a charging load corresponding to a dc output circuit is completed, the charging load is disconnected, the ac-dc power subunit corresponding to the charging load is connected to the ring bus according to the charging record requirement, and the other charging loads obtain electric energy through the ring bus and charge the load together with the ac-dc power subunit corresponding to the charging load. By the method, the idle alternating current-direct current power subunits are utilized in time to increase the charging power of the charging load, and the utilization rate of the charging equipment is improved. Further, when the requirement of the charging load is reduced, the annular bus connected with the load is cut off, further, when the load is charged, the charging load is closed through the direct current switch, and meanwhile, the corresponding alternating current-direct current power subunit can be connected with the annular bus to supply other charging loads. By the method, redundant alternating current-direct current power subunits can be cut off in time, so that the charging power of the charging load is reduced, and other charging loads are reserved.

In summary, in the charging system provided in the embodiment of the present invention, the parallel switch module 20 is arranged, so that the output power between different charging modules 10 can be adjusted and distributed; in each charging module 10, by providing the dc output unit 104, the output power of each dc output circuit 101 can be adjustably distributed. In order to explain the innovation of the embodiment of the present invention in detail with reference to fig. 1 and fig. 2, each charging module 10 includes 5 ac-dc power sub-units, and each ac-dc power sub-unit 1031 outputs 60kW at maximum. Fig. 2 adopts a single-line electrical schematic diagram, so that the expression relationship is more concise, and the lines in the diagram can be positive or negative direct current. The number of the ac-dc power sub-units 1031 is the same as that of the terminals (the split outdoor unit 10-2), and fig. 2 has 10 terminals in total. Further, each of the two charging modules 10 has 5 ac-dc power subunits, and the dc outputs of the charging modules 10 are respectively connected to the electrical circuits 11 to 15 and 21 to 25, which also correspond to the terminals 1 to 5 and 6 to 10, respectively. Furthermore, a DC switch 1041(1K11-1K15, 2K11-2K15) is arranged between each DC output and the corresponding terminal. In a charging module 10, each dc output is connected by a dc switch 1041, and the first and last dc switches 1041 are interconnected to form a ring shape, as shown in fig. 2, 1K11 to 1K15 and 2K11 to 2K15 form a ring structure, respectively. Between the different charging modules 10, there are 5-way parallel switches 201(K1 to K5), specifically, K1 is connected in parallel between the 11 and 21 loops, K2 is connected in parallel between the 12 and 22 loops, K3 is connected in parallel between the 13 and 23 loops, K4 is connected in parallel between the 14 and 24 loops, and K5 is connected in parallel between the 15 and 25 loops. The auxiliary contacts of the dc switches 1041 are connected to the corresponding control circuits, and the auxiliary contacts of the positive and negative switches of the same electrical circuit are both connected in parallel to the corresponding control circuits.

The following list is just the common terminal requirements and how the corresponding charging system implements the power distribution method within the charging module 10 and between the charging modules 10:

requirement 1, terminals 1 to 10 all have a charging requirement.

Switches 1K1 to 1K5 and 2K1 to 2K5 are closed, and switches 1K11 to 1K15, 2K11 to 2K15 and K1 to K5 are opened. Each AC-DC power subunit independently configures power according to the terminal requirement, the maximum output is 60kW, if the power requirement of a certain terminal is W1 (less than 60kW), and the power adjusting function is adopted to enable the AC-DC power subunits to output corresponding power.

Requirement 2, 9 terminals 1 to 10 have charging requirements.

If the terminal 1 has no charging requirement, the ac-dc power subunit corresponding to the terminal 1 can be applied to the terminal 2, the terminal 5 and the terminal 6. The concrete description is as follows:

when the 11-terminal power can be applied to the terminal 2, it is necessary to open 1K1, open the switches 1K11, 1K13 to 1K15, open the switches 2K11 to 2K15 and K1 to K5, and close the switches 1K2 to 1K5 and 2K1 to 2K 5. Further, if the power demand of the terminal 2 is not more than 60kW, the switch-off 1K12 is performed, and if the power demand W2 of the terminal 2 is more than 60kW and less than 120kW, the switch-off 1K12 and the output power of the

terminals

11 and 12 are respectively performed, so that the sum of the output power is W2.

When the power of the 11 terminal can be applied to the terminal 5, 1K1 needs to be opened, switches 1K12 to 1K15 need to be opened, switches 2K11 to 2K15 and K1 to K5 need to be opened, switches 1K2 to 1K5 and switches 2K1 to 2K5 need to be closed, the state of the switch 1K11 is as described above, the power of the terminal 5 can be adjusted within the range of 60kW to 120kW, if the power demand of the terminal 5 is not more than 60kW, 1K12 is opened, if the power W2 demanded by the terminal 5 is more than 60kW and less than 120kW, the power of each output part of the terminals 1K11, 11 terminal and 15 terminal is closed, and the sum of the output powers is ensured to be W2.

When 11-terminal power can be applied to the terminal 6, 1K1 is opened, switches 1K11 to 1K15, 2K11 to 2K15, and K2 to K5 are opened, and switches 1K2 to 1K5, and switches 2K1 to 2K5 are closed. The state of the switch 1K5 corresponds to that, as mentioned above, the power of the terminal 6 can be adjusted in the range of 60kW to 120kW, if the power demand of the terminal 6 is not more than 60kW, the terminal K1 is opened, and if the power W2 demanded by the terminal 6 is more than 60kW and less than 120kW, the output power of each of the terminals K1, 11 and 16 is closed, and the sum of the output powers is W2.

Further, if the terminal 2 has no charging requirement, the ac-dc power subunit corresponding to the terminal 2 may be applied to the terminal 1, the terminal 3 and the terminal 7. And the other terminals do not need to be charged, and the other terminals correspond to the switching of the switch and the like.

Requirement 3, 8 terminals of terminals 1 to 10 have charging requirements.

If 2 terminals which do not need to be charged correspond to 1 charging module 10, if the terminal 1 and the terminal 2 have no charging requirement, the 1K14 and the 1K15 are opened, the 1K1 and the 1K2 are opened, the 2K11 to the 2K15 and the K1 to the K5 are opened, the switches 1K3 to 1K5 and the 2K1 to 2K5 are closed, and the power distribution has the following scheme: if 1K11 and 1K12 are closed and 1K13 is opened, 11-terminal and 12-terminal power can be applied to the terminal 5, and the terminal 5 can output 180kW at maximum; if 1K12 and 1K13 are closed and 1K11 is opened, 12 terminal power and 13 terminal power can be applied to the terminal 3, and the terminal 3 can output 180kW at most; if 1K11 and 1K13 are closed and 1K12 is opened, the maximum output power of terminal 2 and terminal 5 is 120 kW. Other power distribution such as terminal 1 and terminal 3, or terminal 1 and terminal 4, etc. within 1 charging module 10, and so on.

If 2 terminals which do not need to be charged correspond to 2 charging modules 10, if the terminals 1 and 6 have no charging requirements, the terminals 1K1 and 2K1 are disconnected, the terminals 1K13 to 1K15, 2K13 to 2K15 and K1 to K4 are disconnected, the switches 1K2 to 1K5 and 2K2 to 2K5 are closed, and the power distribution has the following scheme: if 1K11 and 2K11 are closed and 1K12, 2K12 and 1K5 are opened, the output of 120kW can be maximally output from the terminal 5 and the terminal 10; if 1K12 and 2K12 are closed and 1K11, 2K11 and 1K5 are opened, the output of 120kW can be output at maximum by the terminal 2 and the terminal 7; if 1K12 and 1K12 are opened and K5 is closed, the terminal 10 can output 180kW at maximum when 2K11 is closed and 2K12 is opened, and the terminal 7 can output 180kW at maximum when 2K12 is closed and 2K11 is opened. Other power distribution such as terminal 1 and terminal 7, or terminal 1 and terminal 8, etc. within 2 charging modules 10, and so on.

Requirement 4, there are 7 terminals 1 to 10 without charging requirement.

If 3 terminals which do not need to be charged correspond to the same 1 charging module 10, for example, the terminal 1, the terminal 2 and the terminal 3 have no charging requirement, the circuit is opened by 1K15, the circuit is opened by 1K1, 1K2 and 1K3, the circuit is opened by 2K11 to 2K15 and the circuit is opened by K1 to K5, the switches 1K4 to 1K5 and the switches 2K1 to 2K5 are closed, and the power distribution has the following schemes: 1K11, 1K12 and 1K13 are closed, 1K14 is opened, and the terminal 5 can output 240kW at most; 1K12, 1K13 and 1K14 are closed, 1K11 is opened, and the terminal 4 can output 240kW at most; 1K11, 1K13 and 1K14 are closed, 1K12 is opened, the terminal 4 can output 180kW at most, and the terminal 5 can output 120kW at most; 1K11, 1K12 and 1K14 are closed, 1K13 is opened, and 120kW can be output at the maximum from the terminal 4 and 180kW can be output at the maximum from the terminal 5. Other power distribution such as terminal 1, terminal 2 and terminal 4, or terminal 1, terminal 2 and terminal 5, etc. within 1 charging module 10, and so on.

If 2 terminals which do not need to be charged correspond to the same 2 charging modules 10, for example, the terminal 1, the terminal 2 and the terminal 6 have no charging requirement, the terminals 1K1, 1K2 and 1K5 are opened, the terminals 1K14 to 1K15 are opened, the terminals 2K13 to 2K15 and K1 to K3 are opened, the switches 1K3 to 1K5 and the terminals 2K2 to 2K5 are closed, and the power distribution has the following scheme: if K4 and K5 are disconnected, the power distribution in each charging module 10, as described in requirement 3, will not be described in detail; if K4 is closed, K5 is opened, 1K12 and 2K12 are closed, 1K11 and 2K11 are opened, and the maximum output of the terminal 7 is 240 kW; if K4 is closed, K5 is opened, 1K12 and 2K11 are closed, 1K11 and 2K11 are opened, the maximum output of the terminal 7 is 180kW, and the maximum output of the terminal 10 is 120 kW; if K4 is opened, K5 is closed, 1K12 and 2K12 are closed, 1K11 and 2K11 are opened, and the terminal 7 can output 240kW at maximum; if K4 is open, K5 is closed, 1K12 and 2K11 are closed, and 1K11 and 2K12 are open, the terminal 10 can output 240kW at maximum. The other power distribution between the 2 charging modules 10 is as described above and with reference to requirement 3 and will not be described in detail.

Demand 5, 6 terminals 1 to 10 have charging demands.

The operation of the specific switch will not be described in detail here, just to exemplify the effect of the power distribution of the terminal. If there is no charging requirement from the terminal 1 to the terminal 4, the terminal can obtain power by controlling different combinations of the switches according to the following conditions: when the maximum power of each of the terminals 5 to 9 is 300kW, the maximum power of the corresponding other terminals needing to be charged is 60 kW; when the maximum terminal 5 is 240kW, the maximum terminal 6 to the maximum terminal 9 are 120kW respectively, and the maximum corresponding terminals needing to be charged are 60 kW; when the terminal 5 is 180kW at maximum, the terminals 6 to 9 are 180kW at maximum respectively, and the maximum of the corresponding other terminals needing to be charged is 60 kW; when the maximum 120kW of the terminal 5 is reached, the maximum 240kW of each of the terminals 6 to 9 is reached, and the maximum 60kW of the corresponding other terminals needing to be charged is reached; when the maximum 60kW of terminal 5, the maximum 300kW respectively of terminal 6 to terminal 9, the maximum 60kW of corresponding other terminals that need to be charged. Other cases are not listed.

Requirement 6, 5 terminals 1 to 10 have no charging requirement.

According to the description, the terminal can reach 360kW at most, and the specific power situation is not described in detail.

It should be noted that the above-described charging requirement is a common situation, and actually each terminal without the charging requirement can apply its corresponding power to other terminals through power distribution.

Based on the above descriptions of different charging requirements, it can be known that, in the power distribution method corresponding to the charging system provided in the embodiment of the present invention, when a terminal corresponding to the dc output loop has a charging requirement, the dc output switch in the dc output loop is closed, and both the dc switch and the parallel switch connected to the dc output loop are opened. When the terminal corresponding to the direct current output loop has no charging requirement, the direct current output switch in the direct current output loop is disconnected, and at least one of the direct current switch and the parallel switch connected with the direct current output loop is closed, for example, the direct current switch is closed, so that the charging power in the same charging module can be adjusted and distributed; for example, the parallel switch is closed, so that the charging power among different charging modules can be adjusted and distributed; and for example, the direct current switch and the parallel switch are closed, and the charging power between the charging modules can be adjusted and distributed. Therefore, in the power distribution method corresponding to the charging system provided by the embodiment of the invention, at least one of the dc switch, the dc output switch and the parallel switch is in a disconnected state, that is, the principle of "three to one" ensures that the charging system normally works.

On the basis of the above embodiment, a first power supply unit and a second power supply unit (not shown in the figure) may also be arranged in the split internal machine 10-1; the first power supply unit is used for supplying power to the alternating current-direct current power subunit, the second power supply unit is used for supplying power to the direct current output switch unit and the direct current switch, so that the capability of the charging system for dealing with fault processing and analysis problems is improved, a 12V or 24V direct current power supply is usually adopted, and the power supply is placed in the split inner machine 10-1, so that the attenuation of long-distance transmission signals is avoided.

On the basis of the above embodiment, with continued reference to fig. 1, the external split unit 10-2 may include knife switches 105, the knife switches 105 correspond to and are connected to the dc output switches 1031, and the knife switches 105 are used to cut off the electrical connection between the external split unit 10-2 and the internal split unit 10-1 when the external split unit 10-2 is repaired. When the split outer machine 10-2 is overhauled and maintained, the direct current output switch 1031 in the corresponding split inner machine 10-1 is switched off, and meanwhile, the split outer machine 10-2 adopts the isolation knife switch 105 to carry out electrical isolation, so that the electric shock risk caused by misoperation of the switch of the split inner machine 10-1 during overhauling is prevented, and the use safety of the charging system is improved; meanwhile, as only the disconnecting link 105 and the direct current output switch 1031 corresponding to the split external unit 10-2 which needs to be overhauled need to be closed, and the disconnecting link 105 and the direct current output switch 1031 corresponding to other split external units 10-2 do not need to be closed, the charging terminal can be charged normally.

On the basis of the above embodiment, with continued reference to fig. 1, the split internal unit 10-1 further includes an ac power supply 106, a lightning protection unit 107, an ac switch 108, a circuit breaker 109, and an ac contactor 110;

the split outdoor unit 10-2 further includes an electricity collection unit 111 and a fuse 112.

The ac power supply 106 is configured to provide an ac current, both the two ac power supplies 106 shown in fig. 1 may be 380V ac power supplies, and the two ac power supplies 102 may be provided by 1 transformer or 2 transformers, which is not limited in this embodiment of the present invention. The lightning protection unit 107 and the ac switch 108 can prevent the surge power from damaging the charging module 10; the circuit breaker 109 is used for subsequent circuit safety; the ac contactor 110 is used to control the main circuit, and the ac terminal of the ac-dc power subunit 1031 is connected to the ac contactor 110. The split outdoor unit 10-2 further comprises an electricity acquisition unit 111, a fuse 112, a control device related to a charging load and the like, and the screen interaction device is selected and matched according to requirements. The electricity collection unit 111 is used for metering and communication, and the fuse 112 is used for overload protection of the charging load. The split external unit 10-2 is simultaneously provided with a corresponding control switching circuit for connecting the power acquisition 111, the fuse 112, the charging load and the like so as to switch the communication of the charging load and receive the control and the communication of the split internal unit.

Optionally, the charging system provided in the embodiment of the present invention may further include a control circuit (not shown in the figure), where the control circuit at least has the following functions: a state monitoring function, such as communication and state monitoring according to a split external machine or a load; the power adjusting function is used for adjusting the output power of a single alternating current-direct current power subunit to be at the maximum or below; the power switching function is used for controlling the direct current output unit to carry out power switching so as to coordinate power to the charging load; the communication function can provide the working state information of the equipment, and is convenient for operators and operators to check the contents such as charging data, equipment communication information and the like; safety functions, other essential functions relating to operator and equipment safety.

On the basis of the above embodiments, fig. 3 is an electrical schematic diagram of another charging system provided in an embodiment of the present invention, and fig. 3 is a simplified schematic diagram of a plurality of charging modules connected in parallel. The parallel technology provided by the invention is also suitable for parallel connection among a plurality of charging modules so as to meet the requirement of a large-scale charging station with more charging terminals. For convenience of describing the parallel state of the multiple charging modules, still taking 5 terminals corresponding to each charging module as an example, the charging modules are configured according to Q charging modules and T (equal to M-1) groups of parallel switch modules, as shown in the figure for briefly describing the basic topology of the charging system formed by the multiple charging units. 41 represents the part from 380V ac power supply to dc output of each split internal machine, and the ac power supply may be provided by a single transformer, or may be provided by a plurality of transformers, as described in detail with reference to fig. 1. 42 represents the direct current output of each split internal machine to the external connection part of the split internal machine, and further, the specific layout is that the parallel switch module can be placed in the previous split internal machine, for example, the 1 st group of parallel switches (K11-K15) are placed in the first split internal machine, as shown in 44, and so on. And 43, a split outer machine corresponding to each split inner machine, wherein the electrical arrangement of the split outer machine is consistent with that of the split outer machine. The power distribution of the multi-charging module after parallel connection meets the principle of 'three to one', and a power configuration scheme with the shortest path is preferentially provided, which is not described in detail.

On the basis of the above embodiments, the embodiment of the present invention further provides a charging method, which is applied to the charging system provided in any embodiment of the present invention. Specifically, fig. 4 is a schematic flow chart of a charging method according to an embodiment of the present invention, and as shown in fig. 4, the charging method according to the embodiment of the present invention includes:

and S110, acquiring charging requirement data of the terminal to be charged corresponding to each direct current output loop, wherein the charging requirement data comprises a charging power requirement.

And S120, judging whether the charging power requirement is greater than the maximum output power of the direct current output loop.

And S130, when the charging power demand information is larger than the maximum output power, judging whether another direct current output loop connected with the direct current output loop through the parallel switch is idle and available.

And S140, when the other direct current output loop connected with the direct current output loop through the parallel switch is idle, controlling the parallel switch to be closed so that the other direct current output loop and the direct current output loop jointly charge the terminal to be charged.

Illustratively, whether the single direct current output loop can meet the charging power requirement is judged according to the charging power requirement and the maximum output power of the single direct current output loop, when the single direct current output loop cannot meet the charging power requirement, whether another direct current output loop connected with the direct current output loop through a parallel switch is idle and available is judged, and when the another direct current output loop connected with the direct current output loop through the parallel switch is idle and has no load, the parallel switch is controlled to be closed, so that the another direct current output loop and the direct current output loop charge the terminal to be charged in the same direction, the charging power requirement of the load is ensured to be met, and the use experience of the charging system is improved.

On the basis of the above embodiments, each charging module provided in the embodiments of the present invention may further include a dc output unit; the direct current output unit comprises a plurality of direct current switches and a connecting bus, the direct current switches are arranged on the connecting bus in series to form an annular bus, and a direct current switch is arranged between any two adjacent direct current output return paths and between the last direct current output return path and the first direct current output return path. Fig. 5 is a schematic flow chart of another charging method provided based on the above charging system, and the charging method shown in fig. 5 is added with a charging power allocation scheme in the same charging module based on the above embodiment. Specifically, as shown in fig. 5, based on the dc output unit, the charging method provided in the embodiment of the present invention includes:

s210, acquiring charging requirement data of the terminal to be charged corresponding to each direct current output loop, wherein the charging requirement data comprise charging power requirements.

S220, judging whether the charging power requirement is larger than the maximum output power of the direct current output loop.

And S230, when the charging power demand information is larger than the maximum output power, judging whether at least one other direct current output loop connected with the direct current output loop through the direct current switch is idle and available.

And S240, when the direct current output loop connected with the direct current output loop through the direct current switch is idle, controlling the direct current switch to be closed so that at least one other direct current output loop and the direct current output loop jointly charge the terminal to be charged.

And S250, when the charging power demand information is larger than the maximum output power, judging whether another direct current output loop connected with the direct current output loop through the parallel switch is idle and available.

And S260, when the other direct current output loop connected with the direct current output loop through the parallel switch is idle, controlling the parallel switch to be closed so that the other direct current output loop and the direct current output loop jointly charge the terminal to be charged.

Specifically, the charging method provided in the embodiment of the present invention is based on the adjustable and distributable charging power among different charging modules, and first determines whether a single dc output loop can meet the charging power requirement according to the charging power requirement and the maximum output power of the single dc output loop, and when the single dc output loop cannot meet the charging power requirement, determines whether another dc output loop connected to the dc output loop through a dc switch is idle and available, and controls the dc switch to be closed when another dc output loop connected to the dc switch is idle and has no load, so that at least one other dc output loop and the dc output loop charge the terminal to be charged together, thereby ensuring that the same charging module meets the charging power requirement of the load, and improving the use experience of the charging system; if the power distribution in the charging module still cannot meet the charging power requirement, whether another direct current output loop connected with the direct current output loop through the parallel switch is idle and available can be further judged at the moment, and when the other direct current output loop connected with the parallel switch is idle and has no load, the parallel switch is controlled to be closed, so that the other direct current output loop and the direct current output loop are charged to the terminal to be charged in the same direction, the charging power requirement of the load is met, and the use experience of the charging system is improved. By preferentially adopting a power distribution method in one charging module and then adopting a parallel connection method among different charging modules, the loss can be reduced, and the charging efficiency is improved.

On the basis of the above embodiment, determining whether at least one other dc output circuit connected to the dc output circuit through the dc switch is idle and available includes:

judging whether at least one adjacent direct current output loop connected with the direct current output loop through a direct current switch is idle and available;

when the direct current output circuit that passes through direct current switch with direct current output circuit and is connected is idle, control direct current switch closed to make at least one other direct current output circuit and direct current output circuit charge to waiting to charge the terminal station altogether, include:

and when at least one adjacent direct current output loop connected with the direct current output loop through the direct current switch is idle, controlling the direct current switch to be closed so that at least one adjacent direct current output loop and at least one adjacent direct current output loop can charge the terminal to be charged together.

Illustratively, when judging whether a spare direct current output loop exists, the power unit of the adjacent station is acquired through the annular bus preferentially, and when the annular bus cannot meet the power requirement of the charging load, the power is acquired from other charging modules through the parallel switch, so that the power distribution method is provided preferentially by taking the minimum path for reducing the loss. On the premise of ensuring the maximum utilization rate of the charging equipment, the control of the power unit is simple and convenient.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may be capable of cooperating with each other in various ways and of being technically driven. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A charging system is characterized by comprising a plurality of charging modules, wherein the plurality of charging modules are arranged in parallel; each charging module comprises a plurality of direct current output loops;

2. The charging system according to claim 1, wherein the number of the dc output circuits included in each of the charging modules is the same and equal to the number of the parallel switches included in the parallel switch module;

3. The charging system according to claim 1, wherein each charging module comprises an internal split unit and a plurality of external split units, the internal split unit comprises a rectifying unit and a direct current output switch unit;

4. The charging system according to claim 3, wherein each of the charging modules further includes a direct current output unit;

5. The charging system according to claim 4, wherein a first power supply unit and a second power supply unit are further provided in the separate body;

6. The charging system according to claim 3, wherein the split external unit comprises disconnecting switches, and the disconnecting switches are in one-to-one correspondence with and connected with the direct current output switches;

7. The charging system according to claim 3, wherein the split internal unit further includes an ac power supply, a lightning protection unit, an ac switch, a circuit breaker, and an ac contactor;

8. A charging method applied to the charging system according to any one of claims 1 to 7, the charging method comprising:

9. The charging method according to claim 8, wherein each of the charging modules further comprises a direct current output unit;

10. The method of claim 9, wherein determining whether at least one other dc output circuit connected to the dc output circuit through the dc switch is idle comprises: