CN115593254A

CN115593254A - Double-source input charging pile system and charging pile control method

Info

Publication number: CN115593254A
Application number: CN202110770554.XA
Authority: CN
Inventors: 樊朝晖; 戴鹏; 岳严霜; 王永文; 范煜东; 沈斌
Original assignee: Zhiyi New Energy Development Co ltd
Current assignee: Zhiyi New Energy Development Co ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2023-01-13

Abstract

The invention discloses a charging pile system with double-source input and a charging pile control method, wherein the charging pile system comprises a vehicle-mounted communication identification device and a plurality of charging pile devices which are connected in parallel; the vehicle-mounted communication identification device is used for acquiring the required power of the vehicle-mounted terminal and identifying whether the adjacent charging potential is full; the charging pile device comprises at least one charging conversion module and a control module, wherein the input end of the charging conversion module comprises a direct current input end and an alternating current input end, the current output by the output end is direct current, and the output power comprises first alternating current power supply power output corresponding to the alternating current input end and/or first direct current power supply power output corresponding to the direct current input end; the vehicle-mounted communication identification device is electrically connected with the control module, and the control module is electrically connected with the charging conversion module. In addition, the control method of the charging pile controls the dynamic capacity increase between the alternating current power supply and the direct current power supply of the charging pile device through the control module, so that full power output is met, and the use efficiency is improved.

Description

Double-source input charging pile system and charging pile control method

Technical Field

The embodiment of the invention relates to the technical field of charging piles, in particular to a double-source input charging pile system and a charging pile control method.

Background

The charging pile is a product specially designed for charging the electric automobile, generally 380-volt three-phase alternating current is accessed, and is communicated with the electric automobile to be converted into voltage and current used by the automobile and output corresponding direct current to charge the electric automobile according to requirements.

Because the power of a standard electric automobile direct current pile is at least more than 35 kilowatts, along with the improvement of automobile technology, the requirement on quick charging is higher and higher, the power of a modern direct current charging pile is commonly 60 kilowatts, and the total power of some double-gun parallel charging piles even reaches 120 kilowatts. Some high-end charging requirements are even already as high as 300 kw. The high power requirement brings huge pressure to power grid power distribution measurement, and a distribution transformer network of a power grid in China cannot support large-scale charging piles, so that 'charging difficulty' is an important reason for restricting the development of modern electric automobiles.

An important concept in the construction of charging infrastructure is power channel capacity increase, which is generally completed by power grid companies. In this process, not only is the power of the distribution transformer increased, but also the cables of the underground network are strengthened to face higher power demand. As widely distributed high-power charging facilities belong to infrastructure construction, particularly underground pipe networks, the channel construction is bound to be faced with land expropriation, removal, power interval expansion, engineering construction as long as dozens of kilometers and the like, and the cost is hundreds of times of that of one charging station. From the economic point of view, there is little possibility for some old urban areas and important business circles with charging requirements, especially with built-in channels.

At present, the charging module of the traditional charging pile has three-phase alternating current input, and when the capacity of an input three-phase power grid is insufficient, the output current of the module is controlled usually in a current reduction mode so as to meet the use requirement of the module, but the output power of the module is greatly influenced, and the use efficiency is reduced.

Moreover, on the basis of the traditional charging pile, the energy storage array and the wind and light energy are added, and each charging position is changed into an alternating current input charging module and a direct current input charging module. Under normal conditions, only the alternating current module works, and only when the alternating current capacity is insufficient, the direct current input charging module is started again. Due to the limitation of the industry, the price of a direct current input charging module on the market is twice that of an alternating current input charging module, so that the cost of the charging pile is greatly increased, and the maintenance cost of the later stage is increased to a certain extent by the two modules.

Disclosure of Invention

Therefore, the embodiment of the invention provides a charging pile system with double-source input and a charging pile control method, which take account of alternating current input and energy storage capacity-increasing direct current input at the same time, realize alternating current power supply power control through an algorithm, and prevent transformer overload, so as to solve the problems that a charging pile module in the prior art cannot output full power and is low in use efficiency, and effectively solve the problem of electric capacity-increasing. In actual design, an anti-traditional access method is adopted, namely an alternating current rectification MPPT rear end and a DC/DC front end share a direct current bus bar end for access, direct current does not need power following conversion, and efficiency is improved by more than 8%. After the storage is added, a simple storage and distribution capacity increasing function can be built, part of electric capacity increasing problems are solved at low cost, the social value is high, and the multifunctional charging pile device is an initial model of a future multifunctional charging pile device.

In order to achieve the above object, in one aspect, an embodiment of the present invention provides a dual-source input charging pile system, which includes a vehicle-mounted communication identification device and a plurality of charging pile devices connected in parallel; the vehicle-mounted communication identification device is used for acquiring the required power of the vehicle-mounted terminal and identifying whether the adjacent charging potential is full; fill the electric pile device and include: the input end of the charging conversion module comprises a direct current input end connected with a first direct current bus and an alternating current input end connected with an alternating current bus, the current output by the output end is direct current, and the output power comprises first alternating current power supply power correspondingly output to the alternating current input end and/or first direct current power supply power correspondingly output to the direct current input end; and the vehicle-mounted communication identification device is electrically connected with the control module, and the control module is electrically connected with the charging conversion module.

Further, the control module comprises a first control component connected with the output end of the charging conversion module, a first direct current switch connected with the direct current input end and a first alternating current switch connected with the alternating current input end.

Further, the first control assembly comprises a first control switch and a second control switch connected with the first control switch in series, and the second control switch is arranged on a second direct current bus between the first charging pile device and a second charging pile device adjacent to the first charging pile device.

Further, a difference between the required power and the first ac supply power forms a differential power.

Further, the differential power is provided by a second alternating current supply power of an unloaded adjacent charging potential.

Further, the differential power is provided by the first dc supply power.

Further, the first direct current bus is connected with an energy storage device, and an inverter is arranged between the first direct current bus and the alternating current bus.

In another aspect, the embodiment of the invention provides a dual-source input charging pile control method, which includes the above dual-source input charging pile system; the control method comprises the following steps:

s1, a vehicle-mounted communication identification device acquires the required power of a vehicle-mounted terminal and identifies whether an adjacent charging position is fully loaded;

s2, transmitting the signal acquired by the vehicle-mounted communication identification device to a control module;

and S3, the control module selects a power supply route meeting the required power of the vehicle-mounted terminal for direct-current charging by controlling the charging conversion module.

Further, step 3 comprises the steps of:

step S31, when the required power of the vehicle-mounted terminal is not larger than the first power supply power of the charging position, the control module controls the first control switch and the first direct current switch to be closed, and the vehicle-mounted terminal is charged by adopting the first power supply power;

step S32: when the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position and the adjacent charging position is in no-load state, the first control switch and the second control switch are closed, and the first power supply power of the charging position and the first power supply power of the adjacent charging position are selected to charge the vehicle-mounted terminal;

step S33: when the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position, and the adjacent charging positions are fully loaded, the first control switch and the first direct current switch are closed, and the first power supply power of the charging position and the second power supply power of the charging position are selected to charge the vehicle-mounted terminal.

According to the embodiment of the invention, the following advantages are provided:

the required power of the vehicle-mounted terminal is acquired through the vehicle-mounted communication identification device, whether the adjacent charging potential is full or not is identified, and then the control module controls the first alternating current power supply and the second direct current power supply in the charging pile module to select a power supply route meeting the required power of the vehicle-mounted terminal for direct current charging; the charging conversion module supports two power supplies, namely an alternating current source for connecting commercial power and a direct current source provided by the energy storage device, through an alternating current input end and a direct current input end on the charging conversion module; according to the principle of first source and then storage, when the capacity of a power grid is insufficient, the direct current input end is connected to enable direct current to be input, the problem that the capacity of an alternating current source is insufficient is solved through the direct current source, full power output is met, and the using efficiency is improved.

Moreover, when the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position and the adjacent charging position is in no-load state, the first control switch and the second control switch are closed, and the first alternating current power supply power of the charging position and the second alternating current power supply power of the adjacent charging position are selected to charge the vehicle-mounted terminal; and only when the required power of the vehicle-mounted terminal is greater than the first alternating current power supply of the charging position and the adjacent charging position is fully loaded, the first control switch and the first direct current switch are closed, and the first alternating current power supply of the charging position and the second alternating current power supply of the charging position are selected to charge the vehicle-mounted terminal. In addition, the invention only switches on the direct current of the direct current input end when the adjacent charging potential is fully loaded, thereby achieving the full power output, improving the use efficiency and achieving the effect of saving the cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.

The structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical essence, and any modifications of the structures, changes of the proportion relation, or adjustments of the sizes, should still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is an electrical connection diagram of a charging conversion module according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of an application architecture and electrical connection of a dual-source charging pile system according to an embodiment of the present invention;

fig. 3 is a flowchart of a control method of a charging pile system with dual-source input according to a second embodiment of the present invention;

fig. 4 is a flowchart of a dual-source charging pile control method according to a second embodiment of the present invention.

In the figure:

10. a charge conversion module; 11. a DC input terminal; 12. an alternating current input end; 13. an output end of the charging conversion module; 21. a first AC switch; 22. a first direct current switch; 23. a first control switch; 24. a second control switch; 31. a first direct current bus; 32. a second DC bus; 40. an alternating current bus; 51. the charging potential; 52. adjacent charging potentials; 60. an energy storage device; 70. an inverter.

Detailed Description

The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this specification, illustrate embodiments and description of the invention and are not to be construed as limiting the invention, but rather as providing the description with a limited sense and the appended claims.

It should be noted that unless a direction is separately defined, all directions such as up, down, left, right, inner, outer, etc. referred to herein are based on the directions such as up, down, left, right, inner, outer, etc. as shown in fig. 1 of the embodiments of the present application, and if the specific posture is changed, the directional indication is changed accordingly. The terms "plurality," "plurality," and "a number" mean two or more, and are used herein interchangeably to describe any sequence, quantity, or importance, and simply to distinguish one element from another. Further, in the various embodiments of the present disclosure, the same or similar reference numerals denote the same or similar components.

In the present invention, unless otherwise specifically stated or limited, the terms "connected," "fixed," and the like are to be construed broadly and, for example, "fixed" may be fixedly connected, detachably connected, or integrated unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In addition, technical solutions in the embodiments of the present application may be combined with each other, but it is necessary to be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the scope of the claims of the present application.

Example one

Referring to fig. 1 and 2, the present embodiment provides a dual-source charging pile system, in which dual-source input is a direct current source provided by an energy storage device 60 and an alternating current source provided by commercial power, and the system includes a vehicle-mounted communication identification device and a plurality of charging pile devices connected in parallel; in the embodiment, four charging pile devices connected in parallel are taken as an example, but not limited to four, and the number of the charging pile devices can be set according to actual conditions (site and user quantity). Each charging pile device in this embodiment includes two charging conversion modules 10, but is not limited to two charging conversion modules, and a plurality of charging conversion modules may be provided according to actual situations, where an input end of each charging conversion module 10 includes a dc input end 11 connected to the first dc bus 31 and an ac input end 12 connected to the ac bus 40, a current output by the output end 13 is a dc current, and an output power is a first ac power supply output corresponding to the ac input end 12 and/or a first dc power supply output corresponding to the dc input end 11; the charge conversion module 10 is electrically connected to a control device, and the control device is electrically connected to a vehicle-mounted communication recognition device for acquiring a required power of the vehicle-mounted terminal and recognizing whether an adjacent charge level is fully loaded.

It should be noted that the vehicle-mounted communication identification apparatus of this embodiment is a communication receiving, data sending and identification device in the prior art, such as: the data CAN be received and sent through 485/CAN communication. As shown in fig. 4, when the load on the output side of the charging pile device in this embodiment is small, the three-phase ac power provided by the commercial power is input through the ac input terminal 12, is rectified and boosted through the input EMI filter, is rectified and boosted through the three-phase active PFC, is transformed through the DC/DC module, and is output from the output terminal as 200-750V direct current with adjustable width; when the load on the output side of the charging pile device is large and the three-phase alternating current input capacity cannot be met, the direct current input is connected through the direct current input end 11, a part of load is shared by the direct current, and the output of the charging pile device is met. In addition, the charging pile system in the embodiment has input detection protection, output detection protection and temperature detection at the same time, and can feed back to the DSP in time when the input side and the output side of the charging pile device are abnormal, so that the work of the charging pile device is suspended, and the charging pile device can work again after alarm and fault elimination.

By using the technical scheme of the embodiment, the embodiment acquires the required power of the vehicle-mounted terminal through the vehicle-mounted communication identification device and identifies whether the adjacent charging potential is full, and then the control module controls the first alternating current power supply and the second direct current power supply in the charging pile module to select the power supply route meeting the required power of the vehicle-mounted terminal for direct current charging; the charging conversion module supports two power supplies, namely an alternating current source for connecting commercial power and a direct current source provided by the energy storage device at the same time, through an alternating current input end and a direct current input end on the charging conversion module; according to the principle of first source and second storage, when the capacity of a power grid is insufficient, the direct current input end is connected to enable direct current to be input, the problem that the capacity of an alternating current source is insufficient is solved through a direct current source, full power output is met, and the using efficiency is improved.

As shown in fig. 1, as a preferred embodiment, the control module in this embodiment includes a first control component connected to the output end 13 of the charging conversion module 10, a first dc switch 22 connected to the dc input end 11, and a first ac switch 21 connected to the ac input end 12. Further, the first control assembly includes a first control switch 23 and a second control switch 24 connected in series with the first control switch 23, the second control switch 24 being disposed on a second dc bus bar 32 between the first charging pile device and a second charging pile device adjacent to the first charging pile device.

As a preferred implementation manner, the difference between the required power of the vehicle-mounted terminal at the charging potential 51 and the first ac power supply in this embodiment forms a differential power.

It should be noted that the first ac switch 21 in this embodiment may be a normally closed switch, and when the adjacent charging potential 52 is unloaded, i.e. when there is no vehicle charging, the differential power is provided by the second ac power supply of the adjacent charging potential 52. Such as: the power output by the three-phase alternating current provided by the commercial power of the single charging conversion module 10 is 30W, the output power of the charging pile device in this embodiment is 60W, when the required power of the vehicle-mounted terminal is greater than 60W and not greater than 120W, and the adjacent charging pile 52 is no-load, the second control switch 24 of the control module is closed at this time, so that the charging pile device of the charging pile 51 at the charging pile position is connected in parallel with the charging pile device of the adjacent charging pile 52, the output power of the charging pile 51 at the charging pile position becomes 120W, the full power output of the charging pile 51 at the charging pile position is greatly satisfied, and the use efficiency is improved. Further, when the charging bit demand increases and the capacity of the transformer is insufficient, the first dc switch 22 is turned on to connect the energy storage device 60 connected to the first dc bus 31, and the capacity of the energy storage device 60 is dynamically increased to meet the use requirement, where the differential power is the first dc power supply power. Specifically, the energy storage device 60 in this embodiment includes an energy storage array and a wind and light power generation system, and when the charging station is idle, the energy storage array may be charged by wind and light energy, and if the current is small, the energy storage array may also be recharged by the commercial power through the charging module. When no charging station is idle and the energy storage array is fully charged, the redundant wind and light energy is inverted into alternating current through the unidirectional inverter 70 (non-PCS) and fed back to the power grid, and the inverter 70 can be omitted if the power grid capacity increase is not considered.

Example two

With reference to fig. 3 and 4, the present embodiment provides a method for controlling a dual-source input charging pile, which includes the dual-source input charging pile system in the first embodiment; the control method comprises the following steps:

s2, transmitting the signals acquired by the vehicle-mounted communication identification device to a control module;

As a preferred embodiment, step 3 in the present embodiment includes the following steps:

step S32: when the required power of the vehicle-mounted terminal is greater than the first power supply power of the charging position, and the adjacent charging position is in no load, the first control switch and the second control switch are closed, and the first power supply power of the charging position and the first power supply power of the adjacent charging position are selected to charge the vehicle-mounted terminal;

In summary, the required power of the vehicle-mounted terminal is acquired through the vehicle-mounted communication identification device, whether the adjacent charging potential is full is identified, and then the control module controls the first alternating current power supply power and the second direct current power supply power in the charging pile module 10 to select the power supply route meeting the required power of the vehicle-mounted terminal for direct current charging; the charging conversion module 10 supports two power supplies of an alternating current bus 40 which is simultaneously connected with commercial power and a direct current bus 31 provided by an energy storage device 60 through an alternating current input end 12 and a direct current input end 11 on the charging conversion module; according to the principle of first source and then storage, when the capacity of a power grid is insufficient, the direct current input end 11 is connected to enable direct current to be input, the problem that the capacity of an alternating current source is insufficient is solved through the direct current source, full power output is met, and the using efficiency is improved. When the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position and the adjacent charging position is in no-load, the first control switch 23 and the second control switch 24 are closed, and the first alternating current power supply of the charging position and the second alternating current power supply of the adjacent charging position are selected to fully charge the vehicle-mounted terminal; furthermore, when the required power of the vehicle-mounted terminal is greater than the first ac power supply of the charging location and the adjacent charging location is fully loaded, the first control switch 23 and the first dc switch 22 are closed, and the first ac power supply of the charging location and the second ac power supply of the charging location are selected to charge the vehicle-mounted terminal. In addition, the invention only switches on the direct current of the direct current input end 22 when the adjacent charging potential is fully loaded, thereby achieving the full power output, improving the use efficiency and achieving the effect of saving the cost.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The utility model provides a two source input fill electric pile system which characterized in that: the system comprises a vehicle-mounted communication identification device and a plurality of charging pile devices connected in parallel;

the vehicle-mounted communication identification device is used for acquiring the required power of the vehicle-mounted terminal and identifying whether the adjacent charging potential is full;

fill the electric pile device and include:

the input end of the charging conversion module comprises a direct current input end connected with a first direct current bus and an alternating current input end connected with an alternating current bus, the current output by the output end is direct current, and the output power is first alternating current power supply power correspondingly output by the alternating current input end and/or first direct current power supply power correspondingly output by the direct current input end;

and the vehicle-mounted communication identification device is electrically connected with the control module, and the control module is electrically connected with the charging conversion module.

2. The dual-source input charging pile system according to claim 1, wherein: the control module comprises a first control assembly connected with the output end of the charging conversion module, a first direct current switch connected with the direct current input end and a first alternating current switch connected with the alternating current input end.

3. The dual-source input charging pile system according to claim 2, wherein: the first control assembly comprises a first control switch and a second control switch connected with the first control switch in series, and the second control switch is arranged on a second direct current bus between the first charging pile device and a second charging pile device adjacent to the first charging pile device.

4. The dual-source input charging pile system according to claim 1, wherein: the difference between the required power and the first ac supply power forms a differential power.

5. The dual-source input charging pile system according to claim 4, wherein: the differential power is provided by a second ac supply power of an unloaded adjacent charging potential.

6. The dual-source input charging pile system according to claim 4, wherein: the differential power is provided by the first direct current supply power.

7. The dual-source input charging pile system according to claim 1, wherein: the first direct current bus is connected with an energy storage device, and an inverter is arranged between the first direct current bus and the alternating current bus.

8. A dual-source input charging pile control method, characterized by comprising the dual-source input charging pile system of claim 1; the control method comprises the following steps:

s2, the control module receives a signal acquired by the vehicle-mounted communication identification device;

and S3, the control module selects a power supply route meeting the power demand of the vehicle-mounted terminal by controlling the output power of the charging conversion module.

9. The method for controlling the charging pile with the double-source input according to claim 8, wherein the step 3 comprises the following substeps:

step S31, when the required power of the vehicle-mounted terminal is not more than the first power supply power of the charging position, the first control switch and the first alternating current switch are closed, and the first alternating current power supply power is adopted to carry out full-power output charging on the vehicle-mounted terminal;

substep S32: when the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position and the adjacent charging position is in no-load state, the first control switch and the second control switch are closed, and the first alternating current power supply of the charging position and the second alternating current power supply of the adjacent charging position are selected to carry out full-power output charging on the vehicle-mounted terminal;

substep S33: when the required power of the vehicle-mounted terminal is larger than the first power supply power of the charging position and the adjacent charging positions are fully loaded, the first control switch and the first direct current switch are closed, and the first alternating current power supply and the first direct current power supply of the charging position are selected to carry out full-power output charging on the vehicle-mounted terminal.