CN117833192A - Charging system and operation method thereof - Google Patents
Charging system and operation method thereof Download PDFInfo
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- CN117833192A CN117833192A CN202410232059.7A CN202410232059A CN117833192A CN 117833192 A CN117833192 A CN 117833192A CN 202410232059 A CN202410232059 A CN 202410232059A CN 117833192 A CN117833192 A CN 117833192A
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- 238000004146 energy storage Methods 0.000 claims description 8
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- 101150003196 PCS1 gene Proteins 0.000 description 4
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- 101100030895 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPT4 gene Proteins 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 1
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Abstract
The invention discloses a charging system and an operation method thereof, wherein the charging system comprises an energy manager, an alternating current bus, a direct current bus, a battery cluster, a power dynamic distribution unit, a switching cabinet and a wire inlet cabinet; the output end of the incoming line cabinet is electrically connected with an alternating current bus, the alternating current bus is electrically connected with a direct current bus and a battery cluster through a first AC/DC module, the alternating current bus is electrically connected with a first input end of the power dynamic distribution unit, a first output end of the power dynamic distribution unit is electrically connected with a first input end of the switching cabinet, the alternating current bus is electrically connected with a second input end of the power dynamic distribution unit, a second output end of the power dynamic distribution unit is electrically connected with a second input end of the switching cabinet, and an output end of the switching cabinet is used for externally connecting a charging pile. According to the invention, the power output from the direct current bus and the alternating current bus is provided for each charging pile through the power dynamic distribution unit and the switching cabinet, the configuration can be flexibly adjusted, the risk of battery overcurrent is effectively reduced, and the stable and safe operation of the system is ensured.
Description
Technical Field
The invention relates to the technical field of charging equipment, in particular to a charging system and an operation method thereof.
Background
With the continuous expansion of new energy automobile markets, the charging technology becomes an important research object in the field. With the development of charging technology and the increase of the charging speed demand, the super-charging pile technology gradually becomes the mainstream charging technology. However, the capacity of the energy storage battery configured by the existing optical storage and charge detection system is far insufficient to support the power requirement of the overcharge pile.
In order to solve the power matching problem of the super-charging pile, the existing charging technology architecture mainly has two kinds: ac-coupled architecture or dc-coupled architecture. The disadvantages of the ac coupling architecture mainly include low charging efficiency, low power quality caused by asynchronous PCS/inversion control of multiple converters, and oscillation of a control system. In contrast, the efficiency of the dc coupling architecture is slightly high, but a high-power PCS matched with the site capacity needs to be provided, so that the overall cost of the device is greatly increased; further, under the condition that the direct current coupling architecture is only configured with a low-capacity battery system, if the power of the overcharge pile load is larger, if the PCS suddenly fails or the power response is not timely, the whole load demand power can be instantaneously added to the energy storage battery system, so that the battery system is in overcurrent discharge, and the stability and the safety of the operation of the whole system are affected by long-time battery overcurrent.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the charging system and the operation method thereof are flexible in configuration, and can effectively reduce the risk of battery overcurrent and ensure the stable and safe operation of the system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a charging system comprises an energy manager, an alternating current bus, a direct current bus, a battery cluster, a power dynamic distribution unit, a switching cabinet and an incoming line cabinet;
the output end of the incoming line cabinet is electrically connected with the alternating current bus, the alternating current bus is simultaneously electrically connected with the direct current bus and the battery cluster through a first AC/DC module, the alternating current bus is electrically connected with the first input end of the power dynamic distribution unit, the first output end of the power dynamic distribution unit is electrically connected with the first input end of the switching cabinet, the direct current bus is electrically connected with the second input end of the power dynamic distribution unit, the second output end of the power dynamic distribution unit is electrically connected with the second input end of the switching cabinet, the input end of the incoming line cabinet is used for being externally connected with a power grid, and the output end of the switching cabinet is used for being externally connected with a charging pile;
the energy manager is respectively in communication connection with the first AC/DC module, the power dynamic distribution unit and the switching cabinet, and is used for determining a first required output power of the direct current bus and a second required output power of the alternating current bus according to the load required power of the charging pile, the current electric quantity of the battery cluster and the system standby power requirement;
the battery cluster and the first AC/DC module are used together to output the first desired output power;
the power dynamic distribution unit is used for receiving the first required output power and the second required output power and outputting the load demand power on the charging pile through the switching cabinet.
In order to solve the technical problems, the invention adopts another technical scheme that:
the operation method of the charging system is applied to the charging system and comprises the following steps:
s1, acquiring and determining a first required output power of a direct current bus and a second required output power of an alternating current bus according to load demand power of a charging pile, current electric quantity of a battery cluster and system standby power demand;
s2, controlling the running conditions of the power dynamic distribution unit and the switching cabinet according to the first required output power and the second required output power, and outputting the load required power at the charging pile.
The invention has the beneficial effects that: the utility model provides a charging system and operation method thereof, electric energy of electric wire netting is distributed to on alternating current busbar and the direct current busbar, power output from direct current busbar and alternating current busbar is provided for each charging pile through power dynamic distribution unit and switching cabinet to can carry out nimble regulation configuration according to load demand power, the present electric quantity of battery cluster etc. even if first AC/DC module breaks down, load demand power also can not all press on the battery cluster, can effectively reduce battery overcurrent risk, guarantee that the system is stable and safe to operate.
Drawings
FIG. 1 is a system architecture diagram of a charging system according to the present invention;
FIG. 2 is a schematic diagram illustrating connection between a power dynamic distribution unit and a switching cabinet of a charging system according to the present invention;
fig. 3 is a schematic diagram illustrating steps of a method for operating a charging system according to the present invention.
Description of the reference numerals:
A. inputting A phase; B. b phase input; C. inputting a phase C;
AU 1-AU 4, and a second AC/DC module; AU 5-AU 8, and a first DC/DC module;
b1, a battery cluster;
d1, a charging pile;
nKM1 to nKM, and an output end of the switching cabinet;
QF1, a first relay; QF2, second relay; QF3, third relay;
u1, a power dynamic allocation unit; u2, a switching cabinet; u3, a wire inlet cabinet; u4, an energy manager; u5, internal load;
PCS1, a first AC/DC module;
vac, ac bus; vdc, dc bus.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, a charging system includes an energy manager U4, an ac bus Vac, a dc bus Vdc, a battery cluster B1, a power dynamic distribution unit U1, a switching cabinet U2, and a wire inlet cabinet U3;
the output end of the incoming line cabinet U3 is electrically connected with the alternating current bus Vac, the alternating current bus Vac is simultaneously electrically connected with the direct current bus Vdc and the battery cluster B1 through a first AC/DC module PCS1, the alternating current bus Vac is electrically connected with the first input end of the power dynamic distribution unit U1, the first output end of the power dynamic distribution unit U1 is electrically connected with the first input end of the switching cabinet U2, the direct current bus Vdc is electrically connected with the second input end of the power dynamic distribution unit U1, the second output end of the power dynamic distribution unit U1 is electrically connected with the second input end of the switching cabinet U2, the input end of the incoming line cabinet U3 is used for externally connecting a power grid, and the output end of the switching cabinet U2 is used for externally connecting a charging pile D1;
the energy manager U4 is respectively in communication connection with the converter PCS, the power dynamic distribution unit U1 and the switching cabinet U2, and the energy manager U4 is configured to determine a first required output power of the dc bus Vdc and a second required output power of the ac bus Vac according to the load demand power of the charging pile D1, the current electric quantity of the battery cluster B1 and the system standby power demand;
the battery cluster B1 and the first AC/DC module PCS1 are used together to output the first required output power;
the power dynamic distribution unit U1 is configured to receive the first required output power and the second required output power, and output the load demand power on the charging pile D1 through the switching cabinet U2.
From the above description, the beneficial effects of the invention are as follows: the power of the power grid is distributed to the alternating current bus Vac and the direct current bus Vdc, the output power from the direct current bus Vdc and the alternating current bus Vac is provided for each charging pile D1 through the power dynamic distribution unit U1 and the switching cabinet U2, flexible adjustment and configuration can be carried out according to load demand power, the current electric quantity of the battery cluster B1 and the like, even if the converter PCS breaks down, the load demand power cannot be fully pressed on the battery cluster B1, the overcurrent risk of the battery can be effectively reduced, and the stable and safe operation of the system is ensured.
Further, the power dynamic distribution unit U1 includes at least two first DC/DC modules and at least two second AC/DC modules;
the input end of each second AC/DC module is electrically connected with the alternating current bus Vac, and the output end of each second AC/DC module is electrically connected with the first input end of the switching cabinet U2 in a one-to-one correspondence manner;
the input end of each first DC/DC module is electrically connected with the direct current bus Vdc, and the output end of each first DC/DC module is electrically connected with the second input end of the switching cabinet U2 in a one-to-one correspondence mode.
As is apparent from the above description, by providing the first DC/DC module and the second AC/DC module, the DC voltage of the DC bus Vdc and the AC voltage of the AC bus Vac can be converted into the DC voltage used for charging the load, respectively, and by combining the switching cabinet U2, each charging pile D1 can enjoy the output of the DC bus Vdc and the AC bus Vac at the same time.
Further, the converter PCS includes at least two first AC/DC modules, and the at least two first AC/DC modules are connected in parallel between the AC bus Vac and the DC bus Vdc.
From the above description, it is known that a plurality of first AC/DC modules in the converter PCS may be arranged in parallel, so as to flexibly perform power conversion.
Further, the battery cluster B1 includes at least two energy storage batteries, and all the energy storage batteries are electrically connected with the dc bus Vdc.
As is apparent from the above description, by providing a plurality of energy storage batteries, the capacity of the battery cluster B1 can be increased while coping with different power supply demands.
Further, the ac bus bar Vac is electrically connected to the converter PCS through a first relay QF1, and the ac bus bar Vac is electrically connected to the power dynamic distribution unit U1 through a second relay QF 2.
As is apparent from the above description, the first relay QF1 and the second relay QF2 are provided to automatically and flexibly control the connection state of the converter PCS and the ac bus Vac, thereby providing protection for the components.
Further, the switching cabinet U2 comprises at least two flexible switches;
one end of the flexible switch is electrically connected with the output end of the power dynamic distribution unit U1, and the other end of the flexible switch is electrically connected with the charging pile D1.
As can be seen from the above description, the switching cabinet U2 can flexibly switch the connection state between the power dynamic distribution unit U1 and each charging pile D1 by providing a flexible switch.
Referring to fig. 3, a method for operating a charging system is applied to the charging system, and includes the following steps:
s1, acquiring and determining a first required output power of a direct current bus Vdc and a second required output power of an alternating current bus Vac according to load demand power of a charging pile D1, current electric quantity of a battery cluster B1 and system standby power demand;
s2, controlling the running conditions of the power dynamic distribution unit U1 and the switching cabinet U2 according to the first required output power and the second required output power, and outputting the load demand power at the charging pile D1.
From the above description, the beneficial effects of the invention are as follows: the power of the power grid is distributed to the alternating current bus Vac and the direct current bus Vdc, power output from the direct current bus Vdc and the alternating current bus Vac is provided for each charging pile D1 through the power dynamic distribution unit U1 and the switching cabinet U2, flexible adjustment and configuration can be carried out according to load demand power, the current electric quantity of the battery cluster B1 and the like, even if the first AC/DC module PSC1 breaks down, the load demand power is not fully pressed on the battery cluster B1, the battery overcurrent risk can be effectively reduced, and the stable and safe operation of the system is ensured.
Further, the step S2 includes:
and controlling the first DC/DC module to output the first required output power, and controlling the second AC/DC module to output the second required output power.
As can be seen from the above description, the first DC/DC module and the second AC/DC module are respectively provided corresponding to the DC bus Vdc and the AC bus Vac, so as to implement AC-DC compatible conversion and implement any DC or AC configuration.
Referring to fig. 1 and 2, a first embodiment of the invention is as follows:
the charging system comprises an energy manager U4, an alternating current bus Vac, a direct current bus Vdc, a battery cluster B1, a power dynamic distribution unit U1, a switching cabinet U2 and a wire inlet cabinet U3; the output end of the incoming line cabinet U3 is electrically connected with an alternating current bus Vac, the alternating current bus Vac is electrically connected with a direct current bus Vdc and a battery cluster B1 through a first AC/DC module PCS1, the alternating current bus Vac is electrically connected with a first input end of the power dynamic distribution unit U1, a first output end of the power dynamic distribution unit U1 is electrically connected with a first input end of the switching cabinet U2, the direct current bus Vdc is electrically connected with a second input end of the power dynamic distribution unit U1, a second output end of the power dynamic distribution unit U1 is electrically connected with a second input end of the switching cabinet U2, an input end of the incoming line cabinet U3 is used for being externally connected with a power grid, and an output end of the switching cabinet U2 is used for being externally connected with a charging pile D1; the energy manager U4 is respectively in communication connection with the first AC/DC module PSC1, the power dynamic distribution unit U1 and the switching cabinet U2. The ac bus Vac supplies power to an internal load U5 of the system, and the internal load U5 is a heat dissipation system, secondary control, power supply and the like, and the third relay QF3 is specifically adopted to be connected with the ac bus Vac;
in the present embodiment, as shown in fig. 1, the power dynamic distribution unit U1 includes at least two first DC/DC modules and at least two second AC/DC modules; the input end of each second AC/DC module is electrically connected with the alternating current bus Vac, and the output end of each second AC/DC module is electrically connected with the first input end of the switching cabinet U2 in a one-to-one correspondence manner; the input end of each first DC/DC module is electrically connected with the direct current bus Vdc, and the output end of each first DC/DC module is electrically connected with the second input end of the switching cabinet U2 in a one-to-one correspondence manner. As shown in FIG. 1, the power dynamic allocation unit U1 may include N3 first DC/DC modules and N4 second AC/DC modules, where 8N 3 is greater than or equal to 0, 8N 4 is greater than or equal to 0, and N3+N4 is greater than or equal to 8.
Meanwhile, N1 second AC/DC modules can be connected in parallel between the DC bus Vdc and the AC bus Vac, and N1 is more than or equal to 2. The battery cluster B1 includes at least two energy storage batteries, all of which are electrically connected with the dc bus Vdc.
In the present embodiment, the AC bus bar Vac is electrically connected to the first AC/DC module PSC1 through the first relay QF1, and the AC bus bar Vac is electrically connected to the power dynamic distribution unit U1 through the second relay QF 2.
Referring to fig. 3, a second embodiment of the present invention is as follows:
an operation method of a charging system is applied to a charging system of the first embodiment, and includes the following steps:
s1, acquiring and determining a first required output power of a direct current bus Vdc and a second required output power of an alternating current bus Vac according to load demand power of a charging pile D1, current electric quantity of a battery cluster B1 and system standby power demand;
s2, controlling the running conditions of the power dynamic distribution unit U1 and the switching cabinet U2 according to the first required output power and the second required output power, and outputting load demand power at the charging pile D1.
In this embodiment, step S2 includes:
the first DC/DC module is controlled to output first required output power, and the second AC/DC module is controlled to output second required output power.
Taking vehicle charging as an example, as shown in fig. 2, for a method of operating a charging system, the following is exemplified:
when the charging vehicle is plugged in, the load demand power p1=100 KW, the energy manager U4 (system EMS) determines how much power the dc bus Vdc should output, i.e. how much power the first required output power P2 (10 KW) and the ac bus Vac should output, i.e. how much power the second required output power P3 (90 KW), p1=p2+p3, according to the load demand power, the current power of the battery cluster B1 and the system standby power demand; p2 and P3 are issued to a power dynamic distribution unit U1, and aiming at P3, the power dynamic distribution unit U1 controls second AC/DC modules AU 1-AU 4 and corresponding flexible switch outputs P3=90 KW; aiming at P2, the power dynamic distribution unit U1 controls the first DC/DC modules AU 5-AU 8 and the corresponding flexible switches to output P3=10KW, and finally, the requirement of charging 100KW of the vehicle is met. The sizes of P2 and P3 are proportioned according to different actual scenes, and are flexibly output, so that different requirements of customers are met.
In summary, according to the charging system and the operation method thereof provided by the invention, the electric energy of the power grid is distributed to the alternating current bus and the direct current bus, the power output from the direct current bus and the alternating current bus is provided for each charging pile through the power dynamic distribution unit and the switching cabinet, and the charging system can be flexibly adjusted and configured according to the load demand power, the current electric quantity of the battery cluster and the like, even if the first AC/DC module fails, the load demand power is not fully pressed on the battery cluster, the battery overcurrent risk can be effectively reduced, and the stable and safe operation of the system is ensured.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (8)
1. The charging system is characterized by comprising an energy manager, an alternating current bus, a direct current bus, a battery cluster, a power dynamic distribution unit, a switching cabinet and an incoming line cabinet;
the output end of the incoming line cabinet is electrically connected with the alternating current bus, the alternating current bus is simultaneously electrically connected with the direct current bus and the battery cluster through a first AC/DC module, the alternating current bus is electrically connected with the first input end of the power dynamic distribution unit, the first output end of the power dynamic distribution unit is electrically connected with the first input end of the switching cabinet, the direct current bus is electrically connected with the second input end of the power dynamic distribution unit, the second output end of the power dynamic distribution unit is electrically connected with the second input end of the switching cabinet, the input end of the incoming line cabinet is used for being externally connected with a power grid, and the output end of the switching cabinet is used for being externally connected with a charging pile;
the energy manager is respectively in communication connection with the first AC/DC module, the power dynamic distribution unit and the switching cabinet, and is used for determining a first required output power of the direct current bus and a second required output power of the alternating current bus according to the load required power of the charging pile, the current electric quantity of the battery cluster and the system standby power requirement;
the battery cluster and the first AC/DC module are used for outputting first required output power together;
the power dynamic distribution unit is used for receiving the first required output power and the second required output power and outputting the load demand power on the charging pile through the switching cabinet.
2. A charging system according to claim 1, wherein the power dynamic distribution unit comprises at least two first DC/DC modules and at least two second AC/DC modules;
the input end of each second AC/DC module is electrically connected with the alternating current bus, and the output end of each second AC/DC module is electrically connected with the first input end of the switching cabinet in a one-to-one correspondence manner;
the input end of each first DC/DC module is electrically connected with the direct current bus, and the output end of each first DC/DC module is electrically connected with the second input end of the switching cabinet in a one-to-one correspondence manner.
3. The charging system of claim 1, wherein the first AC/DC modules are at least two and are disposed in parallel between the AC bus and the DC bus.
4. A charging system according to claim 1, wherein said battery cluster comprises at least two energy storage cells, all of said energy storage cells being electrically connected to said dc bus.
5. A charging system according to claim 1, wherein the AC bus is electrically connected to the first AC/DC module via a first relay and the AC bus is electrically connected to the power dynamic distribution unit via a second relay.
6. A charging system according to claim 1, wherein the switching cabinet comprises at least two flexible switches;
one end of the flexible switch is electrically connected with the output end of the power dynamic distribution unit, and the other end of the flexible switch is electrically connected with the charging pile.
7. A method of operating a charging system as claimed in claim 2, comprising the steps of:
s1, acquiring and determining a first required output power of a direct current bus and a second required output power of an alternating current bus according to load demand power of a charging pile, current electric quantity of a battery cluster and system standby power demand;
s2, controlling the running conditions of the power dynamic distribution unit and the switching cabinet according to the first required output power and the second required output power, and outputting the load required power at the charging pile.
8. The method of claim 7, wherein the step S2 includes:
and controlling the first DC/DC module to output the first required output power, and controlling the second AC/DC module to output the second required output power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410232059.7A CN117833192B (en) | 2024-03-01 | 2024-03-01 | Charging system and operation method thereof |
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| CN202410232059.7A CN117833192B (en) | 2024-03-01 | 2024-03-01 | Charging system and operation method thereof |
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