CN111277028B - Charging system, control method and control device - Google Patents
Charging system, control method and control device Download PDFInfo
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- CN111277028B CN111277028B CN202010084412.3A CN202010084412A CN111277028B CN 111277028 B CN111277028 B CN 111277028B CN 202010084412 A CN202010084412 A CN 202010084412A CN 111277028 B CN111277028 B CN 111277028B
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Abstract
The embodiment of the invention provides a charging system, a control method and a control device. This charging system includes: a rectifier cabinet and at least one DC charging unit. The alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units. Therefore, the charging system is configured in an alternating current and direct current super-distribution mode, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units, so that the cost of the rectifier cabinet is reduced, and the cost of the whole charging system is further reduced.
Description
Technical Field
The invention relates to the technical field of charging control, in particular to a charging system, a control method and a control device.
Background
Currently, a single direct current charging pile is formed by connecting a plurality of high-frequency isolated AC/DC charging modules in parallel, for example, a direct current charging pile with the capacity of 120kW can be connected in parallel through 6 high-frequency isolated AC/DC charging modules with the capacity of 20 kW.
And a charging station needs to be composed of a plurality of single dc charging piles, for example, a 2MW charging station needs to be composed of 17 dc charging piles of 120kW, or 34 dc charging piles of 60 kW. Currently, each dc charging post needs to be connected to the total input end of the charging station through a cable, and the total output power of the charging station is required to be larger than the sum of all the charging posts, however, this method causes the cost of the current charging station to be high.
Therefore, how to provide a charging system capable of reducing the system cost of the charging station is a major technical problem to be solved.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a charging system, which adopts an over-distribution manner to ensure normal power output of a charging pile and reduce system cost.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a charging system, comprising: a rectifier cabinet and at least one DC charging unit,
the alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units.
Optionally, the DC charging unit includes a controller and a plurality of selection branches connected in parallel to each other, where the selection branches include a high-frequency isolation DC/DC converter and a path selection module,
the input ends of the high-frequency isolation DC/DC converters are connected in parallel and are used as the input ends of the direct current units;
in each selection branch, the output end of the high-frequency isolation DC/DC converter is connected with the path selection module;
the output end of the path selection module is used as the output end of the direct current charging unit;
the controller is connected with the control end of the path selection module, and the path selection module switches a conduction path to a target path based on a path switching instruction sent by the controller.
A control method applied to any one of the charging systems, comprising:
acquiring bus voltage on the direct current output bus and state information of the direct current charging unit;
and determining the target output charging power of the direct current charging unit based on the bus voltage and the state information.
Optionally, the determining the target output charging power of the dc charging unit based on the bus voltage and the state information includes:
When the state information is in a state without output power and waiting for output power, judging whether the bus voltage is greater than a first preset voltage value, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit; if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is a ratio of a rated power value of the direct current charging unit to an over-ratio of direct current to alternating current power; and the charging power required by the direct current charging unit is less than or equal to the power limit value of the direct current charging unit.
Optionally, the determining the target output charging power of the dc charging unit based on the bus voltage and the state information includes:
when the state information is in an output power state, judging whether the bus voltage is greater than a first preset voltage value, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the current charging power of the direct current charging unit, wherein the current charging power of the direct current charging unit is less than or equal to the maximum power value of the direct current charging unit; if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power.
Optionally, the method further includes:
when the target output charging power is equal to the preset power threshold, acquiring the current bus voltage on the direct current output bus;
judging whether the current bus is larger than the first preset voltage value and lasts for a preset time, and if so, determining the power limit value of each direct current charging unit as the maximum power value of the direct current charging unit; and if not, determining the power limit value of each direct current charging unit as the preset power threshold value.
A control device applied to any one of the charging systems, comprising:
the first acquisition module is used for acquiring bus voltage on the direct current output bus and state information of the direct current charging unit;
and the determining module is used for determining the target output charging power of the direct current charging unit based on the bus voltage and the state information.
Optionally, the determining module includes:
the first judging unit is used for judging whether the bus voltage is greater than a first preset voltage value or not when the state information is in a state without output power and waiting for output power, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit; if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power; the charging power required by the direct current charging unit is less than or equal to the power limit value of the direct current charging unit.
Optionally, the determining module includes:
a second determining unit, configured to determine whether the bus voltage is greater than a first preset voltage value when the state information is in an output power state, if so, determine that a power limit value of the dc charging unit is a maximum power value of the dc charging unit, and determine that a target output charging power is a current charging power of the dc charging unit, where the current charging power of the dc charging unit is less than or equal to the maximum power value of the dc charging unit; if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power.
Optionally, the method further includes:
the second obtaining module is used for obtaining the current bus voltage on the direct current output bus when the target output charging power is equal to the preset power threshold;
the judging module is used for judging whether the current bus is larger than the first preset voltage value and lasts for a preset time, and if so, the power limiting value of each direct current charging unit is determined to be the maximum power value of the direct current charging unit; and if not, determining the power limit value of each direct current charging unit as the preset power threshold value.
Based on the technical scheme, the embodiment of the invention provides a charging system, a control method and a control device. This charging system includes: a rectifier cabinet and at least one DC charging unit. The alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units. Therefore, the charging system is configured in an alternating current and direct current super-distribution mode, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units, so that the cost of the rectifier cabinet is reduced, and the cost of the whole charging system is further reduced.
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 is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dc charging unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a path selection module according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a control method according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a control method according to another embodiment of the present invention;
fig. 6 is a schematic flow chart of a control method according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a control method according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control device according to an embodiment of the present invention.
Detailed Description
At present, in a large-scale charging station, the three-phase input end of the direct current charging pile needs to be connected to the total input end of the charging station through three cables, and the charging pile is distributed at different positions in the charging station, so that the cost of the three-phase cables in long distance is high. Besides, alternating current low voltage electricity is transmitted on the cable, so that the line loss of the cable is high.
On the basis, the high-frequency isolation type AC/DC charging module is of a two-stage structure, the loss is high, a large fan is needed for heat dissipation, and therefore large noise can be generated. For example, the noise of the high-frequency isolation type AC/DC charging module of 20kW is usually about 65 dB. Experience the sense in order to improve the noise, can carry out the components of a whole that can function independently design with filling electric pile, for example, set up a split type charging frame (including rifle, metering device etc. that charge) outside filling electric pile direct current output 2m, nevertheless, this kind of mode has increased the length and the loss of filling the direct current cable of electric pile direct current output when leading to the area increase of whole charging station.
Based on this, please refer to fig. 1, fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present invention, including: a rectifier cabinet 11 and at least one dc charging unit 12.
The alternating current input end of the rectifier cabinet 11 is connected with an external power grid, the direct current output end of the rectifier cabinet 11 is connected with the input end of at least one direct current charging unit 12 through a direct current output bus 13, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units.
The charging station that this embodiment provided promptly, through rectifier cabinet + DC charging unit's framework to adopt the mode that the alternating current direct current surpassed to join in marriage, utilize the DC bus of higher voltage to realize the reasonable overall arrangement of DC charging unit, the overall arrangement that the direct current of the charging station that this embodiment provided fills electric is the same with current overall arrangement, because the direct current cable is two, the alternating current cable is the three-phase, thereby reduces the quantity that uses the cable, has reduced system cost. Besides, the structure of the direct-current charging cabinet is utilized, the heat dissipation requirement is reduced, and therefore noise is reduced.
Specifically, assuming that the lengths of the cables of the ac-dc power grid are the same and the equivalent resistances Rline thereof are also the same, combining formula (1) and formula (2), where formula (1) is a loss calculation formula of the ac cable and formula (2) is a loss calculation formula of the dc cable, it can be known that, when Δ U is 0, the ac cable loss is the same as the dc cable loss, and when Δ U >0, the dc cable loss is smaller than the ac cable loss.
Wherein Ugrid is the power grid line voltage, Rline is the equivalent cable resistance value, Pin is single charging pile input power, and delta U is the modulation increment default of direct current bus.
For example, suppose the ac input line voltage of the rectifier cabinet is 380V, the rated value of the dc bus voltage is 800V, and the dc bus voltage maintains a small fluctuation range of 750V to 850V. Then, when ungrid is 380V substituted into the formula (1) and the formula (2), Δ U is 262.68V, and it is seen that the dc transmission line loss is significantly small. That is, the charging system provided by this embodiment can reduce the loss of the cable by transmitting the dc signal through the dc output bus.
In addition, the conventional high-frequency isolation type AC/DC charging module includes a PFC stage and an isolation DC/DC stage two-stage structure. It is assumed that the PFC stage and the isolated DC/DC stage of one charging module account for 40% and 60% of each other. Then it is. In the scheme, only the primary structure of the direct current charging unit is included, the loss of the primary structure is only 60% of the original total loss, and the total loss is reduced, so that the heat dissipation requirement on the fan is correspondingly reduced, and therefore the scheme can adopt the fan with low rotating speed, and the noise is reduced.
Further, the inventor considers that the probability of charging by simultaneously adopting the maximum power of each dc charging unit is low, so in this embodiment, the rated power of part of the rectifier cabinet is set to be small, and the sum of the rated powers of the dc charging units is set to be large, for example, the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the dc charging units, which may be considered as the dc-to-ac power over-distribution. .
For example: the rated power of the rectifier cabinet is 1MW, the single direct current charging unit is 120kW, and 20 direct current charging units are arranged in total, so that the total power of the direct current charging units is 2.4MW, and the over-proportion ratio of direct current to alternating current power is 2.4. The comparison shows that the total input end of the original charging station needs to be configured with the rated power of 2.4MW, and the rated power of the rectifier cabinet only needs to be configured in the scheme is 1MW, and the system cost is correspondingly reduced due to the reduction of the rated power of the rectifier cabinet.
On the basis of the foregoing embodiments, as shown in fig. 2, an embodiment of the present invention provides a specific implementation structure of a DC charging unit, where the DC charging unit includes a controller 21 and a plurality of selection branches 22 connected in parallel, where the selection branch 22 includes a high-frequency isolation DC/DC converter 221 and a path selection module 222.
The connection relationship of each module in the direct current charging unit is as follows:
the input terminals of the high-frequency isolated DC/DC converters 221 are connected in parallel and serve as the input terminals of the DC unit. In each of the selection branches 22, an output terminal of the high-frequency isolation DC/DC converter 221 is connected to the path selection module 222. The output terminal of the path selection module 222 serves as the output terminal of the dc charging unit. The controller 21 is connected to a control end of the path selection module 222, and the path selection module 222 switches a conduction path to a target path based on a path switching instruction sent by the controller 21.
In particular, the path selection module may be as shown in fig. 3. For example, the control path O1 is on when the controller outputs the first path switching instruction, the control path O2 is on when the controller outputs the second path switching instruction, and the control path Oi is on when the controller outputs the I-th path switching instruction.
Taking the above-mentioned direct current to alternating current power over-proportion 2.4 as an example, if there are 10 direct current charging units to charge the electric automobile who connects respectively with 120kW simultaneously, then because rectifier cabinet total power is only 1MW, will certainly pull down direct current bus voltage to lead to the unable normal work of system, thereby influence the income of charging. If there are electric vehicles in all 20 dc charging units to be charged, then in order to charge more electric vehicles, no power-off charging is not required, so the embodiment of the present invention provides a control method suitable for an ac/dc over-ratio charging system to achieve autonomous power regulation, as shown in fig. 4. Specifically, the control method is applied to the charging system, and includes the steps of:
s41, acquiring bus voltage on the direct current output bus and state information of the direct current charging unit;
And S42, determining the target output charging power of the direct current charging unit based on the bus voltage and the state information.
In this embodiment, two specific implementation manners for determining the target output charging power of the dc charging unit based on the bus voltage and the state information are provided as follows:
in a first mode
As shown in fig. 5, includes the steps of:
s51, when the state information is in a state of no output power and waiting for output power, judging whether the bus voltage is greater than a first preset voltage value;
s52, if yes, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit;
and S53, if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-proportion ratio of the direct current to the alternating current power.
In this embodiment, the charging power required by the dc charging unit is less than or equal to the power limit value of the dc charging unit.
Illustratively, if the dc charging unit is in a state of no output power and waiting to output power:
a) if the voltage V of the public direct current bus is greater than Vth, setting a power limit value P as the maximum power value of the direct current charging unit, and controlling to output the required charging power;
b) and setting a power limit value P as a preset power threshold value Pth, and determining the target output charging power as the charging power required by the direct current charging unit, wherein the preset power threshold value Pth is the rated value of the direct current charging unit divided by the over-ratio of direct current to alternating current power.
Mode two
As shown in fig. 6, includes the steps of:
s61, when the state information is in an output power state, judging whether the bus voltage is larger than a first preset voltage value;
s62, if yes, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the current charging power of the direct current charging unit, wherein the current charging power of the direct current charging unit is smaller than or equal to the maximum power value of the direct current charging unit;
and S63, if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value Pth is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power.
Illustratively, if the dc charging unit is in an output power state:
a) if the voltage V of the public direct current bus is greater than Vth, setting a power limit value P as the maximum power value of the direct current charging unit, and maintaining and controlling the output of the required charging power;
b) setting a power limit value P as a preset power threshold value Pth, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power. For example, when the current charging power of the direct current charging unit is smaller than the power limit value of the direct current charging unit, determining the current charging power of the direct current charging unit as the target output charging power; and when the current charging power of the direct current charging unit is greater than or equal to the power limit value of the direct current charging unit, determining the power limit value of the direct current charging unit as the target output charging power.
Therefore, by the control method, the charging system provided by the scheme can realize the power output of each direct current charging unit on the basis of configuring the rectifier cabinet with smaller rated power.
On the basis of the above embodiment, as shown in fig. 7, the control method provided in the embodiment of the present invention further includes the steps of:
s71, when the target output charging power is equal to the preset power threshold, acquiring the current bus voltage on the direct current output bus;
s72, judging whether the current bus is larger than the first preset voltage value and lasts for a preset time;
s73, if yes, determining the power limit value of each direct current charging unit as the maximum power value of the direct current charging unit;
and S74, if not, determining the power limit value of each direct current charging unit to be the preset power threshold value.
Illustratively, when the dc charging unit is in the output power state and the operation of setting the power limit value P ═ Pth is triggered, the current bus voltage V1 of the dc bus is continuously monitored:
a) when the duration that the voltage V1 of the common direct current bus is greater than Vth is continuously detected to reach Tth, the power limit value P is recovered to be the maximum power value of the direct current charging unit;
b) when the common direct current bus voltage V1 is continuously detected for a time not reaching Tth and V < ═ Vth is triggered, the power limit value P is maintained as Pth.
Therefore, after the charging system adopts the control method provided by the embodiment, the situation that the charging power of the direct current charging unit is greater than the total input power when the over-ratio of the direct current to the alternating current power is high can be dealt with.
On the basis of the above embodiment, as shown in fig. 8, the present embodiment also provides a control device including:
a first obtaining module 81, configured to obtain a bus voltage on the dc output bus and state information of the dc charging unit;
a determining module 82, configured to determine a target output charging power of the dc charging unit based on the bus voltage and the state information.
Wherein the determining module may include:
the first judging unit is used for judging whether the bus voltage is greater than a first preset voltage value or not when the state information is in a state without output power and waiting for output power, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit; if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power; the charging power required by the direct current charging unit is less than or equal to the power limit value of the direct current charging unit;
A second determining unit, configured to determine whether the bus voltage is greater than a first preset voltage value when the state information indicates that the output power exists, if yes, determine that a power limit value of the dc charging unit is a maximum power value of the dc charging unit, and determine that a target output charging power is a current charging power of the dc charging unit, where the current charging power of the dc charging unit is less than or equal to the maximum power value of the dc charging unit; if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power.
In addition, the control device provided in the embodiment of the present invention may further include:
the second obtaining module is used for obtaining the current bus voltage on the direct current output bus when the target output charging power is equal to the preset power threshold;
the judging module is used for judging whether the current bus is larger than the first preset voltage value and lasts for a preset time, and if so, the power limiting value of each direct current charging unit is determined to be the maximum power value of the direct current charging unit; and if not, determining the power limit value of each direct current charging unit as the preset power threshold value.
The working principle of the device is described in the above method embodiment, and the description is not repeated here.
In summary, embodiments of the present invention provide a charging system, a control method, and a control device. This charging system includes: rectifier cabinet and at least one direct current charging unit. The alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units. Therefore, the charging system is configured in an alternating current and direct current super-distribution mode, and the rated power of the rectifier cabinet is smaller than or equal to the sum of the rated powers of all the direct current charging units, so that the cost of the rectifier cabinet is reduced, and the cost of the whole charging system is further reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A control method applied to a charging system, the charging system comprising: a rectifier cabinet and at least one DC charging unit,
the alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is less than or equal to the sum of the rated powers of all the direct current charging units;
the direct current charging unit comprises a controller and a plurality of selection branches connected in parallel, the selection branches comprise a high-frequency isolation DC/DC converter and a path selection module,
the input ends of the high-frequency isolation DC/DC converters are connected in parallel and are used as the input end of the direct current charging unit;
in each selection branch, the output end of the high-frequency isolation DC/DC converter is connected with the path selection module;
the output end of the path selection module is used as the output end of the direct current charging unit;
the controller is connected with the control end of the path selection module, and the path selection module switches a conduction path to a target path based on a path switching instruction sent by the controller;
The control method comprises the following steps:
acquiring bus voltage on the direct current output bus and state information of the direct current charging unit;
and determining the target output charging power of the direct current charging unit based on the bus voltage and the state information.
2. The control method of claim 1, wherein said determining a target output charging power of the dc charging unit based on the bus voltage and the status information comprises:
when the state information is in a state without output power and waiting for output power, judging whether the bus voltage is greater than a first preset voltage value, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit; if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power;
The charging power required by the direct current charging unit is less than or equal to the power limit value of the direct current charging unit.
3. The control method of claim 1, wherein said determining a target output charging power of the dc charging unit based on the bus voltage and the status information comprises:
when the state information is in the output power state, judging whether the bus voltage is greater than a first preset voltage value, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the current charging power of the direct current charging unit, wherein the current charging power of the direct current charging unit is less than or equal to the maximum power value of the direct current charging unit; if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power.
4. The control method according to claim 3, characterized by further comprising:
when the target output charging power is equal to the preset power threshold, acquiring the current bus voltage on the direct current output bus;
judging whether the current bus is larger than the first preset voltage value and lasts for a preset time, and if so, determining the power limit value of each direct current charging unit as the maximum power value of the direct current charging unit; and if not, determining the power limit value of each direct current charging unit as the preset power threshold value.
5. An electric charging system for executing the control method according to any one of claims 1 to 4, the electric charging system comprising: a rectifier cabinet and at least one DC charging unit,
the alternating current input end of the rectifier cabinet is connected with an external power grid, the direct current output end of the rectifier cabinet is connected with the input end of at least one direct current charging unit through a direct current output bus, and the rated power of the rectifier cabinet is less than or equal to the sum of the rated powers of all the direct current charging units;
the direct current charging unit comprises a controller and a plurality of selection branches connected in parallel, the selection branches comprise a high-frequency isolation DC/DC converter and a path selection module,
The input ends of the high-frequency isolation DC/DC converters are connected in parallel and are used as the input end of the direct current charging unit;
in each selection branch, the output end of the high-frequency isolation DC/DC converter is connected with the path selection module;
the output end of the path selection module is used as the output end of the direct current charging unit;
the controller is connected with the control end of the path selection module, and the path selection module switches a conduction path to a target path based on a path switching instruction sent by the controller.
6. A control device, applied to the charging system according to claim 5, comprising:
the first acquisition module is used for acquiring bus voltage on the direct current output bus and state information of the direct current charging unit;
and the determining module is used for determining the target output charging power of the direct current charging unit based on the bus voltage and the state information.
7. The control apparatus of claim 6, wherein the determining module comprises:
the first judging unit is used for judging whether the bus voltage is greater than a first preset voltage value or not when the state information is in a state without output power and waiting for output power, if so, determining that the power limit value of the direct current charging unit is the maximum power value of the direct current charging unit, and determining that the target output charging power is the charging power required by the direct current charging unit; if not, determining that the power limit value of the direct current charging unit is a preset power threshold value, and determining that the target output charging power is the charging power required by the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power; the charging power required by the direct current charging unit is less than or equal to the power limit value of the direct current charging unit.
8. The control device of claim 6, wherein the determining module comprises:
a second determining unit, configured to determine whether the bus voltage is greater than a first preset voltage value when the state information indicates that there is an output power state, and if so, determine that a power limit value of the dc charging unit is a maximum power value of the dc charging unit, and determine that a target output charging power is a current charging power of the dc charging unit; if not, determining that the power limit value of each direct current charging unit is a preset power threshold value, and determining the target output charging power based on the power limit value of the direct current charging unit and the current charging power of the direct current charging unit, wherein the preset power threshold value is the ratio of the rated power value of the direct current charging unit to the over-ratio of the direct current to the alternating current power; the current charging power of the direct current charging unit is less than or equal to the maximum power value of the direct current charging unit.
9. The control device according to claim 8, characterized by further comprising:
the second obtaining module is used for obtaining the current bus voltage on the direct current output bus when the target output charging power is equal to the preset power threshold;
The judging module is used for judging whether the current bus is larger than the first preset voltage value and lasts for a preset time, and if so, the power limiting value of each direct current charging unit is determined to be the maximum power value of the direct current charging unit; and if not, determining the power limit value of each direct current charging unit as the preset power threshold value.
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