CN110435473B - Power switching device, group control charging system and method - Google Patents

Power switching device, group control charging system and method Download PDF

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Publication number
CN110435473B
CN110435473B CN201910758374.2A CN201910758374A CN110435473B CN 110435473 B CN110435473 B CN 110435473B CN 201910758374 A CN201910758374 A CN 201910758374A CN 110435473 B CN110435473 B CN 110435473B
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China
Prior art keywords
charging
magnetic latching
power
relay
voltage direct
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CN110435473A (en
Inventor
范作程
徐俐
李逸然
王太川
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Shandong Shanda Electric Power Technology Co ltd
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Shandong Shanda Electric Power Technology Co ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60Monitoring or controlling charging stations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60Monitoring or controlling charging stations
    • B60L53/67Controlling two or more charging stations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/12Electric charging stations

Abstract

The disclosure provides a power switching device, a group control charging system and a method. The power switching device comprises a voltage direct current relay, the input end of the voltage direct current relay is connected with the charging module, the output end of the voltage direct current relay is connected with the magnetic latching relay group, and the control end of the voltage direct current relay is connected with the switch controller; a magnetic latching relay group comprising n x 2 magnetic latching relays; the input ends of the magnetic latching relay groups are connected in parallel and are provided with n output ends, and each output end is connected with one bus; each bus consists of a positive bus and a negative bus, and the positive bus and the negative bus are respectively connected with a magnetic latching relay in series; the control end of each magnetic latching relay is connected with the switch controller; each bus is connected with a charging terminal; and the switch controller is used for controlling the high-voltage direct-current relay to be switched off in the process of power switching, controlling the magnetic latching relays in the magnetic latching relay groups corresponding to any charging terminal to be switched on, and then controlling the high-voltage direct-current relay to be switched on to complete switching of the charging module to any charging terminal.

Description

Power switching device, group control charging system and method
Technical Field
The disclosure belongs to the field of electric vehicle charging, and particularly relates to a power switching device, a group control charging system and a group control charging method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, charging piles develop rapidly, and the problem of compatibility and utilization ratio can be intensively solved to the group control charging system, so there is great demand in the market. The group control charging system can automatically distribute output power to a plurality of charging terminals as required. At present, in a power switching control system of a group control charging system, a high-voltage direct-current relay is generally selected as a switching device used in a power switching device, and the power switching control system generally adopts full-matrix switching, that is, any power unit can be switched to any charging terminal. In the full-matrix switching, the number m of power units and the number n of buses are assumed, and the number of switching elements in an intermediate state (a Null-cut state) is as follows: m n 2.
The inventor finds that for a multi-power unit and multi-gun charging system, the number of switching devices is increased in a geometric order of magnitude along with the increase of the number of power units or charging terminals, and a switching matrix is composed of high-voltage direct-current relays, so that the high-voltage direct-current relays are expensive, and the cost of charging equipment is increased.
Disclosure of Invention
In order to solve the above problem, a first aspect of the present disclosure provides a power switching device that reduces costs on the premise of ensuring safe operation of a group control charging system.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a power switching apparatus, comprising:
the input end of the high-voltage direct-current relay is connected with the charging module, the output end of the high-voltage direct-current relay is connected with the magnetic latching relay group, and the control end of the high-voltage direct-current relay is connected with the switch controller;
a magnetic latching relay group comprising n x 2 magnetic latching relays; the input ends of the magnetic latching relay groups are connected in parallel, the magnetic latching relay groups are provided with n output ends, and each output end is connected with one bus; each bus consists of a positive bus and a negative bus, and the positive bus and the negative bus are respectively connected with a magnetic latching relay in series; the control end of each magnetic latching relay is connected with the switch controller; each bus is connected with a charging terminal; n is a positive integer;
the switch controller is configured to: and in the process of power switching, the high-voltage direct-current relay is controlled to be switched off, the magnetic latching relays in the magnetic latching relay groups corresponding to any charging terminal are controlled to be switched on, then the high-voltage direct-current relay is controlled to be switched on, and the charging module is switched to any charging terminal.
In order to solve the above problem, a second aspect of the present disclosure provides a group control charging system, which reduces cost on the premise of ensuring safe operation of the group control charging system.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a group control charging system, comprising:
at least two charging modules, each of which is connected with one of the power switching devices; each charging module is connected with a power controller, and the power controller is used for distributing power to each charging module according to a preset power distribution strategy;
the power controller is further connected with the switch controller and is further used for sending a high-voltage direct-current relay control instruction and a magnetic latching relay group switching instruction to the switch controller, and switching of any charging module to any charging terminal is achieved.
A third aspect of the present disclosure provides a method of operating a group-controlled charging system.
A method of operation of a group control charging system, comprising:
selecting a charging module to be operated, and disconnecting the corresponding high-voltage direct-current relay;
and controlling the magnetic latching relays in the magnetic latching relay groups corresponding to the charging terminals of the power-requiring ends to be closed, and then controlling the high-voltage direct-current relays to be closed, so that any charging module can be switched to any charging terminal.
The beneficial effects of this disclosure are:
(1) the magnetic latching relay is used as a switching device in the power switching device, and meanwhile, in order to solve the problem that the magnetic latching relay can pass through a large current but can not be switched with load, the high-voltage direct-current relay is cooperatively used in the power switching device, and the switching time sequence of the relay is strictly controlled, so that the use quantity of the high-voltage direct-current relay in the power switching device of the group control charging system is reduced on the premise of ensuring safety.
(2) The cost of a single device is reduced from about 150 yuan of the original high-voltage direct-current relay to about 30 yuan of the magnetic latching relay, and the enterprise cost can be greatly reduced on the premise of ensuring the operation safety of a group control charging system. In addition, the magnetic latching relay has a small size and a PCB (printed Circuit Board) level packaging form, and the switching matrix can be distributed to the PCB, so that the wiring is simpler, the structure is more compact, and the maintenance is more facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a power switching device according to an embodiment of the disclosure.
Fig. 2 is a schematic structural diagram of a group control charging system according to an embodiment of the disclosure.
Fig. 3 is a power switching control flow diagram of a group control charging system according to an embodiment of the disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
Example 1
In order to solve the problem of reducing the cost on the premise of ensuring the operation safety of the group control charging system mentioned in the background art, the embodiment adopts the magnetic latching relay as the switching device, and provides the power switching device in cooperation with the use of the high-voltage direct-current relay.
As shown in fig. 1, the power switching apparatus of the present embodiment includes:
the input end of the high-voltage direct-current relay is connected with the charging module, the output end of the high-voltage direct-current relay is connected with the magnetic latching relay group, and the control end of the high-voltage direct-current relay is connected with the switch controller;
a magnetic latching relay group comprising n x 2 magnetic latching relays; the input ends of the magnetic latching relay groups are connected in parallel, the magnetic latching relay groups are provided with n output ends, and each output end is connected with one bus; each bus consists of a positive bus and a negative bus; the control end of each magnetic latching relay is connected with the switch controller; each bus is connected with a charging terminal; n is a positive integer;
the switch controller is configured to: and in the process of power switching, the high-voltage direct-current relay is controlled to be switched off, the magnetic latching relays in the magnetic latching relay groups corresponding to any charging terminal are controlled to be switched on, then the high-voltage direct-current relay is controlled to be switched on, and the charging module is switched to any charging terminal.
The charging terminal can be a charging gun or other power-requiring equipment.
A magnetic latching relay is an automatic switch. As with other electromagnetic relays, it acts to automatically turn on and off the circuit. The magnetic latching relay has the advantages that the normally closed state or the normally open state of the magnetic latching relay completely depends on the action of permanent magnetic steel, and the switching state of the magnetic latching relay is triggered by pulse electric signals with certain width to complete the switching.
In a specific implementation, the high-voltage direct-current relay is connected with the switch controller through a cable.
The magnetic latching relay is connected with the switch controller through a cable.
The power switching device of the embodiment uses the magnetic latching relay as a switching device, and meanwhile, in order to solve the problem that the magnetic latching relay can pass through a large current but can not be switched with a load, the high-voltage direct-current relay is cooperatively used, and the switching time sequence of the relay is strictly controlled, so that the use quantity of the high-voltage direct-current relay in the power switching device of the group control charging system is reduced on the premise of ensuring safety.
Example 2
As shown in fig. 2, a group control charging system of the present embodiment includes:
m charging modules, each charging module being connected to one of the power switching devices shown in fig. 1; each charging module is connected with a power controller, and the power controller is used for distributing power to each charging module according to a preset power distribution strategy; wherein m is a positive integer greater than or equal to 2;
the power controller is further connected with the switch controller and is further used for sending a high-voltage direct-current relay control instruction and a magnetic latching relay group switching instruction to the switch controller, and switching of any charging module to any charging terminal is achieved.
As an embodiment, the power controller is further connected with a charging controller, and the charging controller is connected with a charging terminal; the power controller is used for issuing a charging terminal starting command and controlling the corresponding charging terminal to start after being forwarded by the charging controller.
Specifically, each charging module is connected with the power controller through a first communication bus;
the power controller is also connected with the switch controller through a second communication bus;
the power controller is further connected with the charging controller through a third communication bus, and the power controller is further used for calculating a power distribution strategy to be adopted according to the charging requirement acquired by the charging controller.
The first, second and third communication buses may be CAN buses or other types of communication buses, which may be specifically selected by a person skilled in the art according to the practice.
In this embodiment, the power allocation policy is: and performing equal power distribution on each charging module.
It should be noted that in other embodiments, other power distribution strategies may be adopted, for example, power is distributed to all charging modules in proportion to the usage frequency, and those skilled in the art may specifically select the corresponding power distribution strategy according to the actual situation.
The working method of the group control charging system of the embodiment includes:
selecting a charging module to be operated, and disconnecting the corresponding high-voltage direct-current relay;
and controlling the magnetic latching relays in the magnetic latching relay groups corresponding to the charging terminals of the power-requiring ends to be closed, and then controlling the high-voltage direct-current relays to be closed, so that any charging module can be switched to any charging terminal.
As an embodiment, before disconnecting the high-voltage direct-current relay corresponding to the charging module to be operated, the method further includes:
and distributing power to each charging module according to a preset power distribution strategy.
As another embodiment, the operating method of the group control charging system further includes: and controlling the corresponding charging terminal to start.
When the magnetic latching relay is applied to a high-voltage direct-current path, arc discharge is easily generated under the condition of load switching, so that danger is generated. In order to solve the problem, the above scheme is used in cooperation with a high-voltage direct-current relay to ensure that no current exists in a direct-current bus circuit when the magnetic latching relay is switched, and a specific time sequence control flow is shown in fig. 3:
when preparing to charge, the power controller sends a command of disconnecting the high-voltage direct-current relay to the switch controller, so that the high-voltage direct-current relay is disconnected, the power controller detects and judges whether the high-voltage direct-current relay is disconnected, if so, the power controller sends a command of resetting the magnetic latching relay group to the switch controller and judges whether the magnetic latching relay group is reset, and if so, the charge controller determines a charge module to be opened and the magnetic latching relay to be closed when confirming a charge requirement; firstly, controlling the corresponding magnetic latching relay to be closed, and then closing the high-voltage direct-current relay connected with the corresponding charging module in series, so that the charging module is started and enters a charging state;
after charging is finished, confirming a charging module needing to be closed and a high-voltage direct-current relay needing to be disconnected; and firstly, closing the corresponding charging module, then disconnecting the high-voltage direct-current relay, and finally disconnecting the corresponding magnetic latching relay to finish the charging.
When power is switched, the power unit needs to be shut down, the corresponding high-voltage direct-current relay is disconnected, and after the magnetic latching relay in the power switching device completes the switching action, the power unit is opened and the high-voltage direct-current relay in the power switching device is closed. Therefore, when the normal power unit is switched, the power unit is in a shutdown state, the main relay is in a disconnected state, current cannot be output, and the magnetic latching relay is controlled to act safely.
The scheme is also safe under the condition of the fault of the group control system. The analysis was as follows:
if the charging module is powered off, the magnetic latching relay has a power-off holding function and cannot be switched, and the scheme is safe.
If the switch controller is powered off, the magnetic latching relay keeps the state of the switch controller before the power off, the switching state of each relay is detected again after the switch controller is powered on again, and switching is only carried out when the state of the high-voltage direct-current relay in the loop is off, so that the scheme is safe.
If the main control chip program in the switch controller runs off to cause the magnetic latching relay to act, and if the main relay of the direct current bus is disconnected, the direct current bus does not form a loop and does not have current, so the scheme is safe; if the main relay is not disconnected at the moment, the direct current bus forms a complete charging loop, but the charging load is a battery, the voltage still exists on the battery, no voltage difference exists between two ends of the main contact of the magnetic latching relay, and arc discharge cannot be caused, so that the scheme is safe.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (8)

1. A power switching apparatus, comprising:
the input end of the high-voltage direct-current relay is connected with the charging module, the output end of the high-voltage direct-current relay is connected with the magnetic latching relay group, and the control end of the high-voltage direct-current relay is connected with the switch controller;
a magnetic latching relay group comprising n x 2 magnetic latching relays; the input ends of the magnetic latching relay groups are connected in parallel, the magnetic latching relay groups are provided with n output ends, and each output end is connected with one bus; each bus consists of a positive bus and a negative bus, and the positive bus and the negative bus are respectively connected with a magnetic latching relay in series; the control end of each magnetic latching relay is connected with the switch controller; each bus is connected with a charging terminal; n is a positive integer;
the switch controller, its effect is: in the process of power switching, the high-voltage direct-current relay is controlled to be switched off, the magnetic latching relays in the magnetic latching relay groups corresponding to any charging terminal are controlled to be switched on, then the high-voltage direct-current relay is controlled to be switched on, and the charging module is switched to any charging terminal; the high-voltage direct-current relay is connected with the switch controller through a cable; the magnetic latching relay is connected with the switch controller through a cable.
2. A group control charging system, comprising:
at least two charging modules, each charging module being connected to a power switching device as claimed in claim 1; each charging module is connected with a power controller, and the power controller is used for distributing power to each charging module according to a preset power distribution strategy;
the power controller is further connected with the switch controller and is further used for sending a high-voltage direct-current relay control instruction and a magnetic latching relay group switching instruction to the switch controller, and switching of any charging module to any charging terminal is achieved.
3. The group-controlled charging system of claim 2, wherein the power controller is further coupled to a charge controller, the charge controller being coupled to a charging terminal; the power controller is used for issuing a charging terminal starting command and controlling the corresponding charging terminal to start after being forwarded by the charging controller.
4. The group-controlled charging system of claim 2, wherein the power allocation policy is: and performing equal power distribution on each charging module.
5. The group-controlled charging system of claim 2, wherein the power allocation policy is: power is distributed to all charging modules in proportion to the frequency of use.
6. A method of operating a group-controlled charging system according to any of claims 2 to 5, comprising:
selecting a charging module to be operated, and disconnecting the corresponding high-voltage direct-current relay;
and controlling the magnetic latching relays in the magnetic latching relay groups corresponding to the charging terminals of the power-requiring ends to be closed, and then controlling the high-voltage direct-current relays to be closed, so that any charging module can be switched to any charging terminal.
7. The operating method of the group control charging system according to claim 6, before disconnecting the high voltage direct current relay corresponding to the charging module to be operated, further comprising:
and distributing power to each charging module according to a preset power distribution strategy.
8. The method of operating a group-controlled charging system according to claim 6, further comprising: and controlling the corresponding charging terminal to start.
CN201910758374.2A 2019-08-16 2019-08-16 Power switching device, group control charging system and method Active CN110435473B (en)

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CN110435473B true CN110435473B (en) 2020-09-25

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CN107425575A (en) * 2017-08-31 2017-12-01 西安特锐德智能充电科技有限公司 A kind of intelligent power distribution system of charging electric vehicle
CN107650730A (en) * 2017-10-30 2018-02-02 科大智能(合肥)科技有限公司 A kind of direct-current charging post multiple gun power distribution system
EP3358698A1 (en) * 2017-02-02 2018-08-08 University of Limerick Battery charging

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PT2871090T (en) * 2013-11-06 2020-12-24 Abb Schweiz Ag Charger for electric vehicles with distributed power converter arbitration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103828181A (en) * 2011-09-02 2014-05-28 特斯拉汽车公司 Multiport vehicle DC charging system with variable power distribution
EP3358698A1 (en) * 2017-02-02 2018-08-08 University of Limerick Battery charging
CN107425575A (en) * 2017-08-31 2017-12-01 西安特锐德智能充电科技有限公司 A kind of intelligent power distribution system of charging electric vehicle
CN107650730A (en) * 2017-10-30 2018-02-02 科大智能(合肥)科技有限公司 A kind of direct-current charging post multiple gun power distribution system

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