CN111835073B

CN111835073B - Power supply device, charging system and charging scheduling method

Info

Publication number: CN111835073B
Application number: CN202010123106.6A
Authority: CN
Inventors: 言超; 吴洪洋; 孙丽萍; 倪建军
Original assignee: Delta Electronics Shanghai Co Ltd
Current assignee: Delta Electronics Shanghai Co Ltd
Priority date: 2019-04-18
Filing date: 2020-02-27
Publication date: 2022-08-02
Anticipated expiration: 2040-02-27
Also published as: CN111835073A

Abstract

The application provides a power supply device, a charging system and a charging scheduling method, wherein a first winding and a second winding in the power supply device are arranged on a secondary side of a multi-pulse transformer, output ends of the first winding and the second winding are connected with an input end of a first alternating current-direct current conversion unit, and an output end of the first alternating current-direct current conversion unit is a first power supply end; the third winding and the fourth winding are arranged on the secondary side of the multi-pulse-wave transformer, the output ends of the third winding and the fourth winding are connected with the input end of the second alternating current-direct current conversion unit, and the output end of the second alternating current-direct current conversion unit is a second power supply end; the phases of the output voltages of the first winding, the third winding, the second winding and the fourth winding are sequentially shifted left or right by 15 degrees, so that the network side harmonic wave is suppressed and the circuit cost is reduced while the double-path output power supply is realized.

Description

Power supply device, charging system and charging scheduling method

The present application claims priority of chinese patent application entitled "power supply device, charging system, and charging scheduling method" filed by china patent office on 18/04 in 2019 with application number 201910314569.8, filed by taida electronic enterprise management (shanghai) ltd, the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of power electronics technologies, and in particular, to a power supply device, a charging system, and a charging scheduling method.

Background

Due to the development of social economy and the increasing demand of people for electric power, it is increasingly important to ensure the purification of power supply networks. Harmonic waves are the most common phenomenon existing in the current power system and are the main indexes of the quality of electric energy. For example, an electric vehicle charging device is a nonlinear load, harmonic current is very high during operation, and high harmonic current input into a power grid causes negative effects such as power quality reduction. Therefore, reducing harmonic pollution caused by the power supply device is of great significance to improving power supply quality and ensuring safe operation of the power system.

In an existing centralized high-power electric vehicle charging system, a three-phase grid voltage is converted into a three-phase alternating current commercial power through an isolation transformer, and then the three-phase alternating current commercial power is connected into n AC-DC (alternating current-direct current) charging modules. Wherein each AC-DC charging module consists of a power factor correction rectification circuit and an isolation DC-DC (direct current-direct current) converter. The power factor correction rectifying circuit of each module is an independent circuit, so that harmonic pollution is low, the complexity of the circuit and control is increased, and the cost is high.

Disclosure of Invention

The embodiment of the application provides a power supply device, a charging system and a charging scheduling method, which inhibit network side harmonic waves and reduce circuit cost while realizing dual-output power supply. In a first aspect of embodiments of the present application, there is provided a power supply apparatus, including: the first winding, the second winding, the third winding, the fourth winding, the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit;

the first winding and the second winding are used for being arranged on the secondary side of the multi-pulse-wave transformer, the output ends of the first winding and the second winding are connected with the input end of the first alternating current-direct current conversion unit, and the output end of the first alternating current-direct current conversion unit is a first power supply end;

the third winding and the fourth winding are arranged on the secondary side of the multi-pulse transformer, the output ends of the third winding and the fourth winding are connected with the input end of the second alternating current-direct current conversion unit, and the output end of the second alternating current-direct current conversion unit is a second power supply end;

wherein the phases of the output voltages of the first winding, the third winding, the second winding and the fourth winding are sequentially shifted to the left or 15 degrees to the right.

Optionally, the first winding is a star winding; the second winding is a triangular winding; the third winding is an extended triangular winding which is shifted left by 15 degrees; the fourth winding is an extended triangular winding which is shifted to the right by 15 degrees.

Optionally, the first ac-dc conversion unit includes: the rectifier bridge comprises a first rectifier bridge unit and a second rectifier bridge unit;

the input end of the first rectifier bridge unit is connected with the output end of the first winding;

the input end of the second rectifier bridge unit is connected with the output end of the second winding;

the first rectifier bridge unit and the output end of the second rectifier bridge unit are connected in series to form a first port, and the first port is connected to the first power supply end.

Optionally, the first ac-dc conversion unit further includes: a first DC-DC conversion unit;

the first dc-dc conversion unit is connected between the first port and the first power supply terminal.

the first rectifier bridge unit and the output end of the second rectifier bridge unit are connected in parallel to form a first port, and the first port is connected to the first power supply end.

Optionally, the second ac-dc conversion unit includes: a third rectifier bridge unit and a fourth rectifier bridge unit;

the input end of the third rectifier bridge unit is connected with the output end of the third winding;

the input end of the fourth rectifier bridge unit is connected with the output end of the fourth winding;

the output ends of the third rectifier bridge unit and the fourth rectifier bridge unit are connected in series to form a second port, and the second port is connected to the second power supply end.

Optionally, the second ac-dc conversion unit further includes: a second DC-DC conversion unit;

the second DC-DC conversion unit is connected between the second port and the second power supply terminal.

the output ends of the third rectifier bridge unit and the fourth rectifier bridge unit are connected in parallel to form a second port, and the second port is connected to the second power supply end.

Optionally, the first rectifier bridge unit and the second rectifier bridge unit are both rectifier bridge units with uncontrolled rectification.

Optionally, the third rectifier bridge unit and the fourth rectifier bridge unit are both rectifier bridge units with uncontrolled rectification.

In a second aspect of the embodiments of the present application, there is provided a charging system, including: a multi-pulse transformer and a power supply apparatus as described in any of the first aspects of the present application;

the primary winding of the multi-pulse-wave transformer is connected with a power grid, and the secondary winding of the multi-pulse-wave transformer comprises the first winding, the second winding, the third winding and the fourth winding of the power supply device.

Optionally, the number of power supply devices is greater than or equal to 2.

In a third aspect of the embodiments of the present application, there is provided a charging scheduling method, based on the power supply apparatus in any one of the first aspects of the present application, where the number of the power supply apparatuses is greater than or equal to 2, the method including:

when a charging request of a device to be charged is acquired, acquiring the number of first power supply terminals and the number of second power supply terminals in a working state;

if the number of the first power supply terminals is not equal to that of the second power supply terminals, scheduling the power supply terminal with the smaller value in the number of the first power supply terminals and the number of the second power supply terminals to charge the equipment to be charged;

and if the number of the first power supply ends is equal to that of the second power supply ends, one of the first power supply ends and the second power supply ends is scheduled to charge the equipment to be charged.

Optionally, if the number of the first power supply terminals is equal to the number of the second power supply terminals, then scheduling one of the first power supply terminals and the second power supply terminals to charge the device to be charged includes:

if the number of the first power supply ends is equal to that of the second power supply ends, acquiring the estimated charging remaining time of each first power supply end and each second power supply end in a working state;

if the power supply end with the minimum estimated charging remaining time is the first power supply end, scheduling the first power supply end to charge the equipment to be charged;

and if the power supply end with the minimum estimated charging remaining time is the second power supply end, scheduling the second power supply end to charge the equipment to be charged.

In a fourth aspect of the embodiments of the present application, there is provided a charging scheduling device, based on any one of the power supply devices in the first aspect of the present application, the charging scheduling device including:

the device comprises a request acquisition module, a charging module and a charging module, wherein the request acquisition module is used for acquiring the number of first power supply terminals and the number of second power supply terminals in a working state when acquiring a charging request of a device to be charged;

the first processing module is used for scheduling the power supply end with the smaller numerical value in the number of the first power supply ends and the number of the second power supply ends to charge the equipment to be charged if the number of the first power supply ends is not equal to that of the second power supply ends;

and the second processing module is used for scheduling one of the first power supply end and the second power supply end to charge the equipment to be charged if the number of the first power supply end is equal to that of the second power supply end.

Optionally, the second processing module is configured to obtain the pre-calculated remaining charging time of each first power supply terminal and each second power supply terminal in the working state if the number of the first power supply terminals is equal to the number of the second power supply terminals; if the power supply end with the minimum estimated charging remaining time is the first power supply end, the first power supply end is scheduled to charge the equipment to be charged; and if the power supply end with the minimum estimated charging remaining time is the second power supply end, scheduling the second power supply end to charge the equipment to be charged.

In a fifth aspect of the embodiments of the present application, there is provided a charging scheduling apparatus, including: a memory, a processor and a computer program, the computer program being stored in the memory, the processor running the computer program to perform the charging scheduling method according to the first aspect and various possible designs of the first aspect of the present application.

In a sixth aspect of the embodiments of the present application, a readable storage medium is provided, where a computer program is stored, and the computer program is used, when being executed by a processor, to implement the charging scheduling method according to the first aspect and various possible designs of the first aspect of the present application.

A seventh aspect of the embodiments of the present application provides a power supply apparatus, including:

p winding pairs, each winding pair comprising a first winding and a second winding;

p alternating current-direct current conversion units which correspond to the P windings one to one, wherein each alternating current-direct current conversion unit comprises a first input end, a second input end and an output end, the first input end is connected to the corresponding first winding, and the second input end is connected to the corresponding second winding; and

the P power supply ends correspond to the P alternating current-direct current conversion units one by one, and each power supply end is connected to the corresponding output end;

the phase shift angle between the first winding and the second winding in the same winding pair is 30 degrees, the phase shift angle between the first windings in adjacent winding pairs is 360 degrees/12P, the phase shift angle between the second windings in adjacent winding pairs is 360 degrees/12P, and P is a positive integer greater than or equal to 2.

In an eighth aspect of the embodiments of the present application, there is provided a charging system, including:

m power supply devices according to any one of the eighth aspects of the present application, wherein M is a positive integer; and the number of the first and second groups,

and the primary windings of the multi-pulse-wave transformer are connected with a power grid, and the winding pairs in the M power supply devices are arranged on the secondary sides of the multi-pulse-wave transformer.

The power supply device, the charging system and the charging scheduling method are provided, wherein a first winding and a second winding in the power supply device are arranged on a secondary side of a multi-pulse transformer, output ends of the first winding and the second winding are connected with an input end of a first alternating current-direct current conversion unit, and an output end of the first alternating current-direct current conversion unit is a first power supply end; the third winding and the fourth winding are arranged on the secondary side of the multi-pulse-wave transformer, the output ends of the third winding and the fourth winding are connected with the input end of the second alternating current-direct current conversion unit, and the output end of the second alternating current-direct current conversion unit is a second power supply end; the phases of the output voltages of the first winding, the third winding, the second winding and the fourth winding are sequentially shifted left or right by 15 degrees, so that network side harmonic waves are suppressed and the circuit cost is reduced while double-output power supply is realized.

Drawings

Fig. 1 is a schematic structural diagram of a power supply device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a first AC-DC conversion unit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another first AC-DC conversion unit provided in the embodiment of the present application;

fig. 4A is a schematic structural diagram of another power supply device according to an embodiment of the present disclosure;

4B-4D are 3 alternative examples of FIG. 4A provided by embodiments of the present application;

fig. 5 is a schematic structural diagram of a further first AC-DC conversion unit according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another power supply device according to an embodiment of the present application

Fig. 7 is a schematic structural diagram of a charging system according to an embodiment of the present application;

fig. 8 is a schematic flowchart of a charging scheduling method according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a charging scheduling apparatus according to an embodiment of the present application;

fig. 10 is a schematic hardware structure diagram of a charging scheduling apparatus according to an embodiment of the present application;

fig. 11A is a schematic structural diagram of another power supply device according to an embodiment of the present application;

fig. 11B is a schematic structural diagram of another charging system provided in the embodiment of the present application;

fig. 12 is a schematic structural diagram of a further charging system provided in an embodiment of the present application;

fig. 13 is a schematic structural diagram of another charging system provided in the embodiment of the present application;

fig. 14 is a schematic structural diagram of another charging system provided in the embodiment of the present application;

fig. 15 is a flowchart illustrating another charging scheduling method according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should be understood that, in this application, "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in this application, "plurality" means two or more. "and/or" is merely an association describing an associated object, meaning that three relationships may exist, for example, and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "comprises A, B and C" and "comprises A, B, C" means that A, B, C all comprise, "comprises A, B or C" means comprise one of A, B, C, "comprises A, B and/or C" means comprise any 1 or any 2 or 3 of A, B, C.

It will be understood that the term "connected" is intended to encompass any direct and indirect electrical connection, such that if a first element is connected to a second element, that connection is intended to mean that the first element can be directly electrically connected to the second element, or indirectly electrically connected to the second element through other elements or connections.

It should be understood that in the present application, "B corresponding to a", "a corresponds to B", or "B corresponds to a" means that B is associated with a, and B can be determined from a. Determining B from a does not mean determining B from a alone, but may be determined from a and/or other information. And the matching of A and B means that the similarity of A and B is greater than or equal to a preset threshold value.

As used herein, "if" may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context.

The technical solution of the present application will be described in detail below with specific examples. These particular embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.

In order to solve the technical problems of too complex circuit and high cost in the existing charging system, the application provides a power supply device which realizes double-output power supply, simultaneously inhibits network side harmonic waves and reduces the circuit cost. Various alternative configurations of the power supply apparatus provided by the present invention will be described below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a power supply device according to an embodiment of the present application. The power supply apparatus shown in fig. 1 includes: a first winding 11, a second winding 12, a third winding 21, a fourth winding 22, a first AC-DC conversion unit 13, and a second AC-DC conversion unit 23.

With continued reference to fig. 1, the first winding 11 and the second winding 12 are arranged on the secondary side of the multi-pulse transformer. It is understood that the first winding 11 and the second winding 12 are secondary windings of a multi-pulse transformer. The output ends of the first winding 11 and the second winding 12 are connected to the input end of the first AC-DC converting unit 13, and the output end of the first AC-DC converting unit 13 is a first power supply end V1+, V1-. The first winding 11 and the second winding 12 are coupled from the power grid side through a multi-pulse transformer to obtain electric energy, the electric energy is input into the first AC-DC conversion unit 13 to be converted into alternating current and direct current, and the direct current output after the conversion processing of the first AC-DC conversion unit 13 is charged to the equipment to be charged through the first power supply end V1+ and V1-.

With continued reference to fig. 1, the third winding 21 and the fourth winding 22 are arranged on the secondary side of the multi-pulse transformer. It is understood that the third winding 21 and the fourth winding 22 are also secondary windings of the multi-pulse transformer. The output ends of the third winding 21 and the fourth winding 22 are connected to the input end of the second AC-DC converting unit 23, and the output end of the second AC-DC converting unit 23 is a second power supply end V2+, V2-. The electric energy obtained by coupling the third winding 21 and the fourth winding 22 from the power grid side through the multi-pulse transformer is input into the second AC-DC conversion unit 23 for AC-DC conversion, and the DC power output after the conversion processing by the second AC-DC conversion unit 23 is charged to the device to be charged through the second power supply terminals V2+, V2-.

Wherein, the phases of the output voltages of the first winding 11, the third winding 21, the second winding 12 and the fourth winding 22 are sequentially shifted to the left or to the right by 15 °. The sequential left shift is, for example, a phase shift of the output voltage of the third winding 21 by 15 ° with respect to the phase shift of the output voltage of the first winding 11, a phase shift of the output voltage of the second winding 12 by 15 ° with respect to the phase shift of the output voltage of the third winding 21, and a phase shift of the output voltage of the fourth winding 22 by 15 ° with respect to the phase shift of the output voltage of the second winding 12.

The embodiment provides a power supply device, a first winding and a second winding of the power supply device are used for being arranged on a secondary side of a multi-pulse transformer, output ends of the first winding and the second winding are connected with an input end of a first alternating current-direct current conversion unit, and an output end of the first alternating current-direct current conversion unit is a first power supply end; the third winding and the fourth winding are arranged on the secondary side of the multi-pulse-wave transformer, the output ends of the third winding and the fourth winding are connected with the input end of the second alternating current-direct current conversion unit, and the output end of the second alternating current-direct current conversion unit is a second power supply end; the phase of the output voltage of the first winding, the third winding, the second winding and the fourth winding is sequentially shifted to the left or 15 degrees to the right, so that the network side harmonic wave is suppressed and the circuit cost is reduced while the two-way output power supply is realized.

For example, when a device to be charged is connected to the first power supply terminal for charging, ideally, the current flowing into the power grid contains only 12k ± 1 th harmonic current k equal to 1,2,3 … in addition to the fundamental component, and 6k ± 1 th harmonic current k being odd number is cancelled; when two charging devices are respectively connected to the first power supply terminal and the second power supply terminal for charging, in an ideal case, the current flowing into the power grid contains only 24k + -1 harmonic current k ═ 1,2,3 … in addition to the fundamental component, and 12k + -1 harmonic current with k being an odd number is cancelled out. The power supply device has compatibility, and can flexibly configure a power supply mode according to actual requirements.

In some embodiments, there may be many options for the structure of the first winding 11, the second winding 12, the third winding 21, and the fourth winding 22 in the embodiment shown in fig. 1. For example, the first winding 11 may be a star winding; the second winding 12 may be a delta winding; the third winding 21 may be an edge-extended triangular winding; the fourth winding 22 may be an extended delta winding. However, the specific structure of the first winding 11, the second winding 12, the third winding 21, and the fourth winding 22 in this application is not limited as long as the phases of the output voltages thereof are sequentially shifted to the left or 15 ° to the right.

In the above embodiments, there are various implementations of the first AC-DC converting unit 13, and two alternative circuit configurations of the first AC-DC converting unit 13 are illustrated below with reference to the drawings.

Fig. 2 is a schematic structural diagram of a first AC-DC conversion unit according to an embodiment of the present disclosure. Fig. 3 is a schematic diagram of another first AC-DC conversion unit structure provided in the embodiment of the present application. In some embodiments of the first AC-DC conversion unit 13, the first AC-DC conversion unit 13 includes: the first rectifier bridge unit, second rectifier bridge unit. In the first AC-DC conversion unit configuration 13 as shown in fig. 2 and 3, six diodes D are provided ₁₁ 、D ₁₂ 、D ₁₃ 、D ₁₄ 、D ₁₅ 、D ₁₆ A first rectifier bridge unit consisting of six diodes D ₂₁ 、D ₂₂ 、D ₂₃ 、D ₂₄ 、D ₂₅ 、D ₂₆ The first AC-DC conversion unit 13 may also include more rectifying elements to form the second rectifying bridge unit, but the following is exemplified by the structures shown in fig. 2 and 3 including the first rectifying bridge unit and the second rectifying bridge unit, and the application is not limited thereto.

Referring to fig. 2 and 3, a first rectifier bridge unit is connected to the first winding 11, and an input end of the first rectifier bridge unit is connected to an output end of the first winding 11. The three-phase ac power input from the first winding 11 enters the first rectifier bridge unit for rectification, thereby realizing ac-to-dc conversion. The second rectifier bridge unit is connected to the second winding 12, and an input end of the second rectifier bridge unit is connected to an output end of the second winding 12. The three-phase alternating current input by the second winding 12 enters the second rectifier bridge unit for rectification, so that the alternating current-to-direct current conversion is realized. The first DC-DC conversion unit 131 is connected between the first port B1+, B1-and the first power supply terminal V1+, V1-.

The connection mode between the output ends of the first rectifier bridge unit and the second rectifier bridge unit can be at least two, such as a connection mode in which the output ends are connected in series as illustrated in fig. 2, and a connection mode in which the other output ends are connected in parallel as illustrated in fig. 3.

In some embodiments, referring to fig. 2, the first rectifying bridge unit is connected in series with the output of the second rectifying bridge unit to form a first port B1+, B1-, and the first port B1+, B1-is connected to the first power supply terminal V1+, V1-. Wherein, the first AC-DC conversion unit 13 may further include: a first DC-DC conversion unit 131. As shown in fig. 2, the first DC-DC conversion unit 131 is connected between the first ports B1+, B1-and the first power terminals V1+, V1-.

In other embodiments, referring to fig. 3, in the first AC-DC conversion unit 13, the first rectifier bridge unit may be connected in parallel with the output end of the second rectifier bridge unit to form a first port B1+, B1 ", and the first port B1+, B1" is connected to the first power supply terminal V1+, V1 ". Likewise, the first AC-DC conversion unit 13 further includes: a first DC-DC-DC conversion unit. The first DC-DC converting unit 131 is connected between the first port B1+, B1-and the first power supply terminal V1+, V1-.

In some embodiments of the second AC-DC conversion unit, the second AC-DC conversion unit comprises: the third rectifier bridge unit and the fourth rectifier bridge unit. The second AC-DC conversion unit may include more rectifying elements, but the following is an example of a structure including a third rectifying bridge unit and a fourth rectifying bridge unit, and the present application is not limited thereto.

In some embodiments, a third rectifier bridge unit is connected to the third winding 21, and an input terminal of the third rectifier bridge unit is connected to an output terminal of the third winding 21. The three-phase alternating current input by the third winding 21 enters the third rectifier bridge unit for rectification, so that alternating current-to-direct current conversion is realized. The fourth rectifier bridge unit is connected to the fourth winding 22, and an input end of the fourth rectifier bridge unit is connected to an output end of the fourth winding 22. The three-phase alternating current input by the fourth winding 22 enters the fourth rectifier bridge unit for rectification, so that alternating current-to-direct current conversion is realized.

The third rectifier bridge unit and the fourth rectifier bridge unit can be connected in at least two ways.

In some embodiments, the third rectifier bridge unit is connected in series with the output of the fourth rectifier bridge unit to form a second port, and the second port is connected to the second power supply terminals V2+, V2-. Wherein the second AC-DC conversion unit may further include: a second DC-DC conversion unit. The second dc-dc conversion unit is connected between the second port and the second power supply terminal V2+, V2-. The structure of this embodiment is similar to the structure of fig. 2, in which the first rectifier bridge unit and the second rectifier bridge unit form the first port, and refer to fig. 2.

In other embodiments, the third rectifier bridge unit and the output terminal of the fourth rectifier bridge unit are connected in parallel to form a second port, and the second port is connected to the second power supply terminal V2+, V2-. The second AC-DC conversion unit 23 may further include: and a second DC-DC conversion unit. The second DC-DC conversion unit is connected between the second port and the second power supply terminal V2+, V2-. The structure of this embodiment is similar to the structure of fig. 3, in which the first port is formed by the first rectifier bridge unit and the second rectifier bridge unit, and the schematic diagram of fig. 3 can be seen.

In the above embodiments, the first DC-DC conversion unit and the second DC-DC conversion unit may have the same structure or different structures, and the specific structure is not limited herein. In some embodiments, in order to further reduce harmonics, refer to fig. 4A, which is a schematic structural diagram of another power supply device provided in the embodiments of the present application, and the first AC/DC converting unit 13 is taken as an example for explanation, and the structure of the second AC/DC converting unit 23 can be analogized accordingly. The power supply device shown in fig. 4A may further include: a first input filter 14, a second input filter 24, a first output filter 15, a second output filter 25. The output terminals of the first winding 11 and the second winding 12 are connected to the input terminal of the first AC-DC converting unit 13 through a first input filter 14, and the output terminal of the first AC-DC converting unit 13 is connected to the first power supply terminal V1+, V1-through a first output filter 15. The output terminals of the third winding 21 and the fourth winding 22 are connected to the input terminal of the second AC-DC converting unit 23 through the second input filter 24, and the output terminal of the second AC-DC converting unit 23 is connected to the second power supply terminal V2+, V2-through the second output filter 24. The embodiment shown in fig. 4A further reduces harmonics by adding filters at the input and output. The first input filter 14 and the second input filter 24 may be formed by one or more sets of filters, which is not limited herein.

The structure shown in fig. 4A is to add a first input filter 14, a second input filter 24, a first output filter 15, and a second output filter 25 to the first AC-DC conversion unit 13 and the second AC-DC conversion unit 23 to achieve the purpose of reducing harmonics. For the specific implementation of fig. 4A, the structure of the first AC-DC converting unit 13 is taken as an example, and the structure of the second AC-DC converting unit 23 may be the same as that of the first AC-DC converting unit 13, which is not described in detail. Referring to fig. 4B-4D, 3 alternative examples of fig. 4A are provided in an embodiment of the present application.

In the embodiment shown in fig. 4B, the first rectifier bridge unit and the output terminal of the second rectifier bridge unit are connected in series to form a first port B1+, B1 —, and the first input filter 14 may specifically include a first input filtering subunit and a second input filtering subunit. The first input filtering subunit is arranged at the input end of the first rectifier bridge unit, and the second input filtering subunit is arranged at the input end of the second rectifier bridge unit so as to filter the input voltages of the first rectifier bridge unit and the second rectifier bridge unit and reduce harmonic waves.

In the embodiment shown in fig. 4C, the first rectifier bridge unit is connected in parallel with the output of the second rectifier bridge unit to form the first port B1+, B1 —, and the first input filter 14 may specifically include a first input filtering subunit and a second input filtering subunit. The first input filtering subunit is arranged at the input end of the first rectifier bridge unit, and the second input filtering subunit is arranged at the input end of the second rectifier bridge unit so as to filter the input voltages of the first rectifier bridge unit and the second rectifier bridge unit and reduce harmonic waves.

In the embodiment shown in fig. 4D, the first AC-DC converting unit 13 may include a first DC-DC converting subunit 1311 and a second DC-DC converting subunit 1312, that is, the first DC-DC converting unit 131 includes the first DC-DC converting subunit 1311 and the second DC-DC converting subunit 1312. The first ports B1+, B1-may specifically include ports B11+, B11-, B12+, B12-as shown in fig. 4D in this embodiment. The output of the first rectifier bridge unit is connected to the input of the first DC-DC conversion subunit 1311 through ports B11+, B11-, and the output of the second rectifier bridge unit is connected to the input of the second DC-DC conversion subunit 1312 through ports B12+, B12-. The outputs of the first DC-DC converting subunit 1311 and the second DC-DC converting subunit 1312 are connected in parallel to the first power supply terminal V1+, V1-. The first input filter 14 may specifically comprise a first input filtering subunit and a second input filtering subunit. The first input filtering subunit is arranged at the input end of the first rectifier bridge unit, and the second input filtering subunit is arranged at the input end of the second rectifier bridge unit so as to filter the input voltage of the first rectifier bridge unit and the input voltage of the second rectifier bridge unit and reduce harmonic waves.

On the basis of the above embodiments, referring to fig. 5, a schematic structural diagram of a further first AC-DC conversion unit provided in the embodiments of the present application is shown. In the first DC-DC conversion unit 131 included in the first AC-DC conversion unit 13 shown in fig. 5, the bus capacitor C is mainly included _BH 、C _BL Power tube Q ₅₁ 、Q ₅₂ 、 Q ₅₃ 、Q ₅₄ 、Q ₅₅ 、Q ₅₆ 、Q ₅₇ 、Q ₅₈ Output inductance L ₅₁ 、L ₅₂ 、L ₅₃ 、L ₅₄ And an output capacitor C ₅₁ 、C ₅₂ . Wherein, the power tube Q ₅₁ 、Q ₅₂ 、Q ₅₃ 、Q ₅₄ Form a first DC conversion circuit, a power tube Q ₅₅ 、Q ₅₆ 、Q ₅₇ 、Q ₅₈ The second dc conversion circuit is formed, but the present application is not limited thereto. The current obtained from the first ports B1+ and B1-is converted by the first DC-DC conversion unit 131 shown in fig. 5, and outputs a direct current to the first power supply terminals V1+ and V1-.

In some embodiments, such as the embodiments shown in fig. 2 and fig. 3, the first rectifier bridge unit and the second rectifier bridge unit are both rectifier bridge units with uncontrolled rectification, and the circuit of the rectifier bridge units with uncontrolled rectification has a simple structure and low cost. However, the first rectifier bridge unit and the second rectifier bridge unit may also be rectifier bridge units for active rectification, and are not limited herein.

In some embodiments, the third rectifier bridge unit and the fourth rectifier bridge unit are rectifier bridge units with uncontrolled rectification, and the rectifier bridge units with uncontrolled rectification have simple circuit structure and low cost. However, the third rectifier bridge unit and the fourth rectifier bridge unit may also be rectifier bridge units for active rectification, and are not limited herein.

In the above embodiment, preferably, the first rectifier bridge unit, the second rectifier bridge unit, the third rectifier bridge unit and the fourth rectifier bridge unit are all identical in structure, and when two power supply terminals operate simultaneously, 12k ± 1 times of grid-side harmonic currents with k being odd number can be completely cancelled out, so that the power factor effect is better.

In some embodiments, different output voltages or currents can be provided by series-parallel switching of the first power supply terminal and the second power supply terminal to adapt to various charging requirements. Fig. 6 is a schematic structural diagram of another power supply device according to an embodiment of the present application. The power supply device shown in fig. 6 may further include: a power supply switching unit 30.

The power supply switching unit 30 includes a first switching element G1, a second switching element G2, and a third switching element G3. The first switch component G1 is connected between the negative pole V1-of the first power supply terminal and the positive pole V2+ of the second power supply terminal; the second switch component G2 is connected between the positive pole V1+ of the first power supply terminal and the positive pole V2+ of the second power supply terminal; the third switch component G3 is connected between the negative pole V1-of the first power supply terminal and the negative pole V2-of the second power supply terminal. Wherein the second switch assembly G2 is linked with the third switch assembly G3.

When the first switch component G1 is closed and the second switch component G2 is disconnected with the third switch component G3 in a linkage manner, the first power supply end is connected with the second power supply end in series, so that the output voltage is raised, and the charging power supply for the high-voltage charging equipment is facilitated.

When the first switch component G1 is opened and the second switch component G2 is linked with the third switch component G3 to be closed, the first power supply end is connected in parallel with the second power supply end, so that the output current is raised, and the charging power supply for the low-voltage high-current charging equipment is facilitated.

When the first switch component G1 is turned off, and the second switch component G2 is linked with the third switch component G3 and turned off, the first power supply terminal and the second power supply terminal are two power supply terminals for independently supplying power.

With continued reference to fig. 1, an embodiment of the present application further provides a power supply apparatus, including: a first AC-DC conversion unit 13 and a second AC-DC conversion unit 23. The input end of the first AC-DC conversion unit 13 is configured to be connected to the output end of a first winding and the output end of a second winding, where the first winding and the second winding are configured to be disposed on the secondary side of the multi-pulse transformer, and the output end of the first AC-DC conversion unit 13 is a first power supply end; the input end of the second AC-DC converting unit 23 is configured to be connected to the output end of a third winding and the output end of a fourth winding, where the third winding and the fourth winding are configured to be disposed on the secondary side of the multi-pulse transformer, and the output end of the second AC-DC converting unit 23 is a first power supply end. For various possible embodiments of the power supply apparatus shown in fig. 1, reference may be made to the above-mentioned illustrations in fig. 1 to 6, which are not described herein again.

On the basis of the various embodiments, referring to fig. 7, a structural schematic diagram of a charging system provided in the embodiments of the present application is shown. The charging system 30 shown in fig. 7 includes: a multi-pulse transformer 31 and the power supply device described in any of the above embodiments, wherein the number of the power supply devices is greater than or equal to 2.

The primary winding of the multi-pulse transformer 31 is connected to a power grid and is used for obtaining a power grid voltage. And the secondary winding of the multi-pulse transformer 31 includes the first winding 11, the second winding 12, the third winding 21 and the fourth winding 22 of the power supply device.

In some embodiments, the primary winding of the multi-pulse transformer 31 may be a star winding or a delta winding.

In some embodiments, the number of power supply devices is greater than or equal to 2. If the number of the power supply devices is M, the charging system can provide 2M power supply ports, so as to meet the charging requirements of 2M devices to be charged. Compared with a charging system consisting of M single power supply port power supply devices, the embodiment can more flexibly configure the power supply ports, obtain double power supply port number, and improve the resource utilization rate.

Based on the above various embodiments of the power supply device, referring to fig. 8, a schematic flowchart of a charging scheduling method provided in the embodiments of the present application is shown. The execution subject of the method shown in fig. 8 may be software and/or hardware, and may be, for example, a charging scheduling device of a charging station or a network contract scheduling system. The charging scheduling method shown in fig. 8 includes steps S101 to S103, which are specifically as follows:

s101, when a charging request of the equipment to be charged is obtained, the number of the first power supply terminals and the number of the second power supply terminals in the working state are obtained.

For example, a user reserves a charging place and/or a charging period through a network, and for example, when the charging scheduling device detects that an electric vehicle enters a charging station, the charging scheduling device actively triggers a charging request, so that when the charging scheduling device acquires the charging request, the charging scheduling device immediately acquires the number of the first power supply terminals and the number of the second power supply terminals which are currently in a working state. Assuming that there are 100 first power supply terminals and 100 second power supply terminals in a charging station, in order to reduce harmonic current as much as possible, according to the number difference between the first power supply terminals and the second power supply terminals in the working state, it should be determined whether to schedule the first power supply terminals or the second power supply terminals to the device to be charged according to a scheduling strategy that makes the number of the first power supply terminals and the number of the second power supply terminals in the working state equal as much as possible.

S102, if the number of the first power supply terminals is not equal to that of the second power supply terminals, the power supply terminal with the smaller value in the number of the first power supply terminals and the number of the second power supply terminals is scheduled to charge the equipment to be charged.

For example, the number of the first power supply terminals in the working state is 34, and the number of the second power supply terminals in the working state is 35, then when an electric vehicle newly entering the charging station requests charging, the first power supply terminal is scheduled to charge the electric vehicle. The specific mode that the first power supply terminal charges the electric automobile can start a charging pile corresponding to the first power supply terminal in an idle state, and the position or the identification code of the charging pile is provided for a user of the electric automobile.

S103, if the number of the first power supply terminals is equal to that of the second power supply terminals, one of the first power supply terminals and the second power supply terminals is scheduled to charge the equipment to be charged.

For example, 35 first power supply terminals in the operating state and 35 second power supply terminals in the operating state are provided, so that when an electric vehicle newly entering the charging station requests charging, the first power supply terminal or the second power supply terminal can be randomly scheduled to charge the electric vehicle.

In some embodiments, the expected charging remaining time may also be introduced in step S103 to determine whether to schedule the first power supply terminal or the second power supply terminal to the device to be charged. Specifically, if the number of the first power supply terminals is equal to the number of the second power supply terminals, the estimated remaining charging time of each first power supply terminal and each second power supply terminal in the operating state is obtained. And if the power supply end with the minimum estimated charging remaining time is the first power supply end, scheduling the first power supply end to charge the equipment to be charged. And if the power supply end with the minimum pre-charging remaining time is the second power supply end, scheduling the second power supply end to charge the equipment to be charged. For example, 35 first power supply terminals in the working state and 35 second power supply terminals in the working state are provided, however, one of the 35 first power supply terminals in the working state will end power supply after 10 minutes, and the time from the end of power supply of the first power supply terminal and the second power supply terminal in other working states is longer than 1 hour, at this time, an electric vehicle enters a charging station to request charging. In order to maintain the consistent number of the first power supply terminals and the second power supply terminals in the working state as much as possible, the charging scheduling device determines to schedule the first power supply terminals to charge the equipment to be charged.

In the charging scheduling method provided by this embodiment, when a charging request of a device to be charged is obtained, the number of first power supply terminals and the number of second power supply terminals in a working state are obtained; if the number of the first power supply terminals is not equal to that of the second power supply terminals, scheduling the power supply terminal with the smaller value in the number of the first power supply terminals and the number of the second power supply terminals to charge the equipment to be charged; if the number of the first power supply ends is equal to that of the second power supply ends, one of the first power supply ends and the second power supply ends is scheduled to charge the equipment to be charged, so that the number of the first power supply ends and the number of the second power supply ends which are in a working state at the same time are maintained at a similar level, the power supply device works with 24-pulse power supply equipment which is close to or equivalent to the number of the first power supply ends and the second power supply ends, and the harmonic suppression effect of the power supply device is improved.

After the charging scheduling method of the embodiment of the application is applied, referring to table one, the harmonic content on the network side obtained by the charging simulation of the electric vehicle provided by the embodiment of the application is obtained, and when the number of the electric vehicles to be charged reaches 3, the harmonic content starts to be obviously reduced.

Watch 1

Number of electric vehicles	A first power supply terminal	Second power supply terminal	Net side harmonic content
				1	1	0	7.68％
3	2	1	2.48％
				5	3	2	1.85％
7	4	3	1.59％
				9	5	4	1.49％
11	6	5	1.47％

Fig. 9 is a schematic structural diagram of a charging scheduling device according to an embodiment of the present application. In addition to any of the above embodiments of the power supply apparatus, the charging scheduling apparatus 40 shown in fig. 9 includes:

a request obtaining module 41, configured to obtain the number of first power supply terminals and the number of second power supply terminals in a working state when obtaining a charging request of a device to be charged; a first processing module 42, configured to schedule a power supply terminal with a smaller value in the number of the first power supply terminals and the number of the second power supply terminals to charge the device to be charged if the number of the first power supply terminals is not equal to the number of the second power supply terminals;

a second processing module 43, configured to schedule one of the first power supply terminal and the second power supply terminal to charge the device to be charged if the number of the first power supply terminal is equal to the number of the second power supply terminal.

On the basis of the foregoing embodiment, the second processing module 43 is configured to, if the number of the first power supply terminals is equal to the number of the second power supply terminals, obtain the estimated remaining charging time of each first power supply terminal and each second power supply terminal in the working state; if the power supply end with the minimum estimated charging remaining time is the first power supply end, scheduling the first power supply end to charge the equipment to be charged; and if the power supply end with the minimum estimated charging remaining time is the second power supply end, scheduling the second power supply end to charge the equipment to be charged.

The charging scheduling device in the embodiment shown in fig. 9 can be correspondingly used to execute the steps in the embodiment of the method shown in fig. 8, and the implementation principle and the technical effect are similar, which are not described herein again.

Referring to fig. 10, which is a schematic diagram of a hardware structure of a charging scheduling apparatus provided in an embodiment of the present application, the charging scheduling apparatus 50 includes: a processor 51, a memory 52 and computer programs; wherein the content of the first and second substances,

a memory 52 for storing the computer program, which may also be a flash memory (flash). The computer program is, for example, an application program, a functional module, or the like that implements the above method.

A processor 51, configured to execute the computer program stored in the memory, so as to implement the steps performed by the charging scheduling device in the above method. Reference may be made in particular to the description relating to the preceding method embodiment.

Alternatively, the memory 52 may be separate or integrated with the processor 51.

When the memory 52 is a device independent from the processor 51, the charge scheduling apparatus may further include:

a bus 53 for connecting the memory 52 and the processor 51.

The power supply device provided by the present application is not limited to the above embodiments, and fig. 11A is a schematic structural diagram of another power supply device provided by the embodiments of the present application. As shown in the figure, the power supply device includes: p winding pairs, P AC-DC conversion units and P power supply ends, wherein P is a positive integer greater than or equal to 2.

In the P winding pairs shown in fig. 11A, each winding pair includes a first winding and a second winding. As shown in fig. 11A, the first winding pair (corresponding to the uppermost winding pair in fig. 11A) includes a first winding Z1 and a second winding Z2, and the pth winding pair (corresponding to the lowermost winding pair in fig. 11A) includes a first winding Z (2P-1) and a second winding Z (2P). The P AC-DC conversion units are respectively in one-to-one correspondence with the P windings, each AC-DC conversion unit comprises a first input end, a second input end and an output end, wherein the first input end is connected to the corresponding first winding, and the second input end is connected to the corresponding second winding. As shown in fig. 11A, the AC-DC converting unit 1 is connected to the first winding pair, specifically, the first input terminal of the AC-DC converting unit 1 is electrically connected to the winding Z1, and the second input terminal is electrically connected to the winding Z2; the AC-DC conversion unit P is connected to the pth winding pair, specifically, the first input terminal of the AC-DC conversion unit P is connected to the winding Z (2P-1), and the second input terminal is connected to the winding Z (2P). The P power supply ends are respectively in one-to-one correspondence with the P AC-DC conversion units, and each power supply end is connected to the corresponding output end. As shown in fig. 11A, the AC-DC conversion unit 1 corresponds to the power supply terminal D1, and specifically the output terminal of the AC-DC conversion unit 1 is electrically connected to the power supply terminal D1 or directly forms the power supply terminal D1; the AC-DC conversion unit P corresponds to the power supply terminal DP, and particularly, an output terminal of the AC-DC conversion unit P is electrically connected to the power supply terminal DP or directly forms the power supply terminal DP.

The phase shift angle between the first and second windings in the same winding pair is 30 ° (e.g., 30 ° between winding Z1 and winding Z2), 360 °/12P between the first windings in adjacent winding pairs, and 360 °/12P between the second windings in adjacent winding pairs. That is, in the power supply device, the phase shift angle between the winding Zi and the winding Z (i +2) is 360 °/12P. Assuming P is 2, the phase shift angle between winding Z1 and winding Z2 is 30 °, the phase shift angle between winding Z1 and winding Z3 is 15 °, the phase shift angle between winding Z3 and winding Z4 is 30 °, and the phase shift angle between winding Z2 and winding Z4 is 15 °.

As shown in fig. 11A, in the power supply apparatus, when P power supply terminals are simultaneously connected to the charging device, 12P pulse rectification charging is performed. It can be understood that the power supply device forms a 12P pulse rectification charging structure when all the P power supply terminals are in the working state.

Fig. 11B is a schematic structural diagram of another charging system provided in the embodiment of the present application. The charging system 40 shown in fig. 11B includes: a multi-pulse transformer 41 and M power devices shown in fig. 11A, where M is a positive integer, and the number of the power devices is preferably greater than or equal to 2.

The primary winding of the multi-pulse transformer 41 is connected to the power grid and is used for obtaining the voltage of the power grid. The secondary winding of the multi-pulse transformer 41 includes M winding pairs of the power devices, i.e., M × P winding pairs of the M power devices are disposed on the secondary side of the multi-pulse transformer 41.

In this embodiment, the charging system 40 may provide M × P power supply ports, so as to meet the charging requirements of M × P devices to be charged. Further, the charging system 40 includes a charging scheduling device (not shown in the figure) for scheduling the states of the power supply terminals according to the total number of the charging devices and the number of pulses 12P of the multi-pulse transformer, and flexibly configuring the power supply ports. The charging scheduling device schedules each position power supply end to work or keep idle so as to form a multi-pulse wave rectification charging system as much as possible and reduce current ripple and harmonic waves in the system.

In an embodiment, the charging scheduling apparatus detects that the total number of the charging devices is n × P, that is, the total number of the charging devices is an integer multiple of the number of power supply terminals owned by a single power supply apparatus, and the system power supply terminals have redundancy. The charging scheduling device is used for scheduling the power supply terminals of n power supply devices to simultaneously supply power to n × P charging devices from the M power supply devices, n is a positive integer and n is less than or equal to M, and the n power supply devices form a 12P pulse wave rectification charging system to reduce system harmonics. When the number of the charging devices is less than M x P, part of the power supply terminals are in a working state, and the other part of the power supply terminals are in an idle state.

In another embodiment, the charging scheduling apparatus detects that the total number of the charging devices is n × P + j, that is, the total number of the charging devices is an integer multiple of the number of power terminals owned by a single power supply apparatus, plus a number smaller than the number of power terminals owned by a single power supply apparatus, and the system power terminals are redundant. The charging scheduling means is configured to schedule the power supply terminals of the n power supply means to simultaneously supply power to the n × P charging devices from the M power supply means. And in the rest M-n power supply devices, scheduling j power supply terminals in any one power supply device to supply power for the rest j charging equipment, wherein n and j are positive integers, and n < M and j < P. The 12P pulse rectification charging can be kept to the maximum extent in the charging system, and the harmonic wave is minimized.

In the above embodiment, when P is an even number greater than 2 and j is an even number, 24-pulse rectification charging for the remaining j charging devices may also be implemented through scheduling of the power supply terminal. In the remaining M-n power supply devices, any one power supply device is scheduled, and the P power supply terminals in this one power supply device are divided into P/2 groups, each group including the k ' th power supply terminal and the k ' + P/2 power supply terminal, where k ' is 1 … P/2. The charging scheduling device selects j/2 groups of power supply terminals in the power supply device to supply power for the remaining j charging devices. Finally, the n power supply devices form a 12P pulse wave rectification charging system, and the power supply devices for supplying power to the remaining j charging devices form 24 pulse wave rectification charging, so that system harmonic optimization is realized.

In yet another embodiment, the charging scheduling means detects that the total number of the charging devices is 2n, the P power supply terminals in each power supply means are divided into P/2 groups, each group includes a k ' th power supply terminal and a k ' + P/2 th power supply terminal, k ' is 1 … P/2, and P is an even number. The charging scheduling device is configured to schedule n power supply devices from the M power supply devices, select a group of power supply terminals in each power supply device, and supply power to the 2n charging devices, where n is a positive integer and is not greater than M.

Fig. 12 is a schematic structural diagram of another charging system provided in the embodiment of the present application. As shown in fig. 12, the charging system 50 includes a multi-pulse transformer 51 and M power supply devices, each of which includes 3 winding pairs, each of which includes a first winding and a second winding. As shown in fig. 12, each of the 3 winding pairs included in the power supply device includes, in order from top to bottom, a first winding pair including a first winding Z1 and a second winding Z2, a second winding pair including a first winding Z3 and a second winding Z4, and a third winding pair including a first winding Z5 and a second winding Z6. As shown in fig. 12, the 3 AC-DC conversion units include an AC-DC conversion unit 1, an AC-DC conversion unit 2, and an AC-DC conversion unit 3 in this order from top to bottom. The 3 winding pairs are respectively connected with the three AC-DC conversion units in a one-to-one corresponding mode. A first input terminal of the AC-DC conversion unit 1 is electrically connected to the winding Z1, and a second input terminal is electrically connected to the winding Z2; the first input terminal of the AC-DC conversion unit 2 is electrically connected to the winding Z3, and the second input terminal is electrically connected to the winding Z4; the AC-DC conversion unit 3 has a first input terminal electrically connected to the winding Z5 and a second input terminal electrically connected to the winding Z6. The 3 power supply ends are respectively in one-to-one correspondence with the 3 AC-DC conversion units, and each power supply end is connected to the output end of the corresponding AC-DC conversion unit. As shown in fig. 12, the output terminal of the AC-DC conversion unit 1 is connected to the power supply terminal D1 or directly forms the power supply terminal D1; the output end of the AC-DC conversion unit 2 is connected to the power supply end D2 or directly forms a power supply end D2; the output terminal of the AC-DC converting unit 3 is connected to the power supply terminal D3 or directly forms the power supply terminal D3.

The phase shift angle between the first winding Z1 and the second winding Z2 in the first winding pair is 30 °, the phase shift angle between the first winding Z3 and the second winding Z4 in the second winding pair is 30 °, the phase shift angle between the first winding Z1 in the first winding pair and the first winding Z3 in the second winding pair is 10 °, and the phase shift angle between the second winding Z2 in the first winding pair and the second winding Z4 in the second winding pair is 10 °. The phase shift angle between the first winding Z5 of the third winding pair and the second winding Z6 is 30 °, and the phase shift angle between the first winding Z3 of the second winding pair and the first winding Z5 of the third winding pair is 10 °, and the phase shift angle between the second winding Z4 of the second winding pair and the second winding Z6 of the third winding pair is 10 °. That is, windings Z1, Z3 and Z5 are sequentially shifted to the left (or right) by 10 °, and windings Z2, Z4 and Z6 are sequentially shifted to the left (or right) by 10 °.

In this embodiment, the charging system 50 may provide 3M power supply ports, so as to meet the charging requirements of 3M devices to be charged. Further, the charging system 50 further includes a charging scheduling device (not shown in the figure) for scheduling the states of the power supply terminals according to the total number of the charging devices and the pulse number 36 of the multi-pulse transformer, so as to flexibly configure the power supply ports.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 3n, the charging scheduling apparatus is configured to schedule the power supply terminals (D1, D2, and D3) of the n power supply apparatuses from the M power supply apparatuses to simultaneously supply power to the 3n charging devices, where n is a positive integer and n is less than or equal to M, and the n power supply apparatuses form a 36-pulse wave rectification charging system to reduce system harmonics. When there is a multiple of 3 electric vehicles to be charged, any power supply ends D1, D2 and D3 are evenly distributed to form a thirty-six-pulse wave rectification charging station.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 3n + j, the charging scheduling apparatus is configured to schedule the power supply terminals of n power supply apparatuses to simultaneously supply power to 3n charging devices from M power supply apparatuses. And in the rest M-n power supply devices, scheduling j power supply terminals in any one power supply device to supply power for the rest j charging equipment, wherein n and j are positive integers, and n < M and j < 3. 36-pulse rectification charging can be kept to the maximum extent in the charging system, and the harmonic wave is minimized. When 3n +1 or 3n +2 electric vehicles need to be charged, the fact that the difference of the vehicles distributed to the power supply terminals D1, D2 and D3 is only 1 is guaranteed, and the harmonic wave minimum can be controlled as well.

Fig. 13 is a schematic structural diagram of another charging system provided in the embodiment of the present application. As shown in fig. 13, the charging system 60 includes a multi-pulse transformer 61 and M power supply devices, each of which includes 4 winding pairs, 4 AC-DC conversion units and 4 power supply terminals. The charging system 60 is similar in structure to the charging system 50, and similar portions will not be described again, and only differences therebetween will be described. The phase shift angle between the first winding and the second winding in the same winding pair is 30 °, the phase shift angle between the first windings in adjacent winding pairs is 7.5 °, and the phase shift angle between the second windings in adjacent winding pairs is 7.5 °. That is, the windings Z1, Z3, Z5 and Z7 are sequentially moved leftward (or rightward) by 7.5 degrees, and the windings Z2, Z4, Z6 and Z8 are sequentially moved leftward (or rightward) by 7.5 degrees. In this embodiment, the charging system 60 may provide 4M power supply ports, so as to meet the charging requirements of 4M devices to be charged.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 4n, the charging scheduling apparatus is configured to schedule the power supply terminals (D1, D2, D3, and D4) of the n power supply apparatuses from the M power supply apparatuses to simultaneously supply power to the 4n charging devices, where the n power supply apparatuses form a 48-pulse rectification charging system, so as to reduce system harmonics. When there is a multiple of 4 electric vehicles to be charged, any power supply terminals D1, D2, D3 and D4 are evenly distributed to form a forty-eight pulse wave rectification charging station.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 4n + j, the charging scheduling apparatus is configured to schedule the power supply terminals of n power supply apparatuses to simultaneously supply power to 4n charging devices from M power supply apparatuses. And in the remaining M-n power supply devices, scheduling j power supply terminals in any one power supply device to supply power to the remaining j charging equipment, wherein j < 4. 48-pulse rectification charging can be kept to the maximum extent in the charging system, and the harmonic wave minimum is achieved. When the electric vehicles except for the multiples of 4 need to be charged, the fact that the vehicles to which the power supply terminals D1, D2, D3 and D4 are distributed only differ by 1 is guaranteed, and the harmonic wave minimum can be controlled.

When the charge scheduling means detects that the total number of charging devices is 4n +2, i.e., j is equal to 2. And the charging scheduling device schedules any power supply device in the rest M-n power supply devices, wherein 4 power supply ends in the power supply devices are divided into 2 groups, one group comprises the power supply ends D1 and D3, the other group comprises the power supply ends D2 and D4, and then the power supply ends D1 and D3 or the power supply ends D2 and D4 are selected to supply power for the rest 2 charging devices. Taking the power supply terminals D1 and D3 as an example to supply power to the remaining 2 charging devices, D1 corresponds to the windings Z1 and Z2, D3 corresponds to the windings Z5 and Z6, and the phase shift angle between the windings Z1 and Z5 is 15 °, and the phase shift angle between the windings Z2 and Z6 is 15 °, so as to satisfy the condition of forming 24-pulse rectification. Therefore, the n power supply devices for charging the 4n charging devices form a 48-pulse rectification charging system, and the power supply devices for supplying power to the remaining 2 charging devices form 24-pulse rectification charging, so that system harmonic optimization is realized.

In this embodiment, if the charging scheduling apparatus detects that the total number of charging devices is 2n, the 4 power supply terminals in each power supply apparatus are divided into 2 groups, one group includes the power supply terminals D1 and D3, and the other group includes the power supply terminals D2 and D4. The charging scheduling device is configured to schedule n power devices from the M power devices, and select a group of power terminals (for example, the power terminals D1 and D3 or the power terminals D2 and D4) in each power device to supply power to the 2n charging devices. When the electric automobile with the multiple of 2 needs to be charged, the vehicles are guaranteed to be evenly distributed to the power supply ends D1 and D3, at the moment, twenty-four pulse wave rectification charging stations can be formed, and the vehicles can also be evenly distributed to the power supply ends D2 and D4, so that the twenty-four pulse wave rectification charging stations are formed.

Fig. 14 is a schematic structural diagram of another charging system provided in the embodiment of the present application. As shown in fig. 14, the charging system 70 includes a multi-pulse transformer 71 and M power supply devices, each of which includes 6 winding pairs, 6 AC-DC conversion units and 6 power supply terminals. The charging system 70 is similar in structure to the charging system 50, and similar portions will not be described again, and only differences therebetween will be described. The phase shift angle between the first winding and the second winding in the same winding pair is 30 °, the phase shift angle between the first windings in adjacent winding pairs is 5 °, and the phase shift angle between the second windings in adjacent winding pairs is 5 °. That is, windings Z1, Z3, Z5, Z9 and Z11 are sequentially moved leftward (or rightward) by 5 °, and windings Z2, Z4, Z6, Z8, Z10 and Z12 are sequentially moved leftward (or rightward) by 5 °. In this embodiment, the charging system 70 may provide 6M power supply ports, so as to satisfy the charging requirements of 6M devices to be charged.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 6n, the charging scheduling apparatus is configured to schedule the power supply terminals (D1, D2, D3, D4, D5, and D6) of n power supply apparatuses to simultaneously supply power to 6n charging devices from M power supply apparatuses, and the n power supply apparatuses form a 72-pulse rectification charging system to reduce system harmonics. When there are 6 multiples of electric vehicles to be charged, any power supply terminals D1, D2, D3, D4, D5 and D6 are evenly distributed to form a seventy-two pulse wave rectification charging station.

In this embodiment, if the charging scheduling apparatus detects that the total number of the charging devices is 6n + j, the charging scheduling apparatus is configured to schedule the power supply terminals of n power supply apparatuses to simultaneously supply power to the 6n charging devices from the M power supply apparatuses. And in the remaining M-n power supply devices, scheduling j power supply terminals in any one power supply device to supply power for the remaining j charging equipment, wherein j < 6. The 72-pulse rectification charging can be kept to the maximum extent in the charging system, and the harmonic wave is minimized. When the electric vehicles except for 6 times need to be charged, the fact that the vehicles to which the power supply terminals D1, D2, D3, D4, D5 and D6 are allocated only differ by 1 is guaranteed, and the harmonic wave can be controlled to be minimum.

When the charge scheduling means detects that the total number of charging devices is 6n +2 or 6n +4, i.e., j is equal to 2 or 4. The charging scheduling device schedules any one power supply device among the remaining M-n power supply devices, and 6 power supply terminals in the power supply device are divided into 3 groups, wherein one group comprises power supply terminals D1 and D4, one group comprises power supply terminals D2 and D5, and the other group comprises power supply terminals D3 and D6. When the total number of the charging equipment is 6n +2, selecting one group of power supply ends to supply power for the rest 2 charging equipment; and when the total number of the charging equipment is 6n +4, selecting two groups of power supply terminals to supply power for the remaining 4 charging equipment. Taking the power supply terminals D1 and D4 as an example to supply power to the remaining 2 charging devices, D1 corresponds to the windings Z1 and Z2, D4 corresponds to the windings Z7 and Z8, and the phase shift angle between the windings Z1 and Z7 is 15 °, and the phase shift angle between the windings Z2 and Z8 is 15 °, so as to satisfy the condition of forming 24-pulse rectification. Therefore, the n power supply devices for charging the 6n charging devices form a 72-pulse rectification charging system, and the power supply devices for supplying power to the remaining j charging devices form 24-pulse rectification charging systems, so that system harmonic optimization is realized.

In this embodiment, if the charging scheduling apparatus detects that the total number of charging devices is 2n, the 6 power supply terminals in each power supply apparatus are divided into 3 groups, where one group includes the power supply terminals D1 and D4, one group includes the power supply terminals D2 and D5, and the other group includes the power supply terminals D3 and D6. The charging scheduling apparatus is configured to schedule n power devices from the M power devices, select a group of power supply terminals (for example, power supply terminals D1 and D4, or power supply terminals D2 and D5, or power supply terminals D3 and D6) in each power device, and supply power to the 2n charging devices. When the electric automobile with the multiple of 2 needs to be charged, the vehicles are averagely distributed to the power supply terminals D1 and D4, or the vehicles are averagely distributed to the power supply terminals D2 and D5, or the vehicles are averagely distributed to the power supply terminals D3 and D6, and twenty-four pulse wave rectification charging can be formed.

The AC-DC conversion unit structures in the embodiments shown in fig. 11A, 11B, 12, 13 and 14 may be various, and in some implementations, each of the AC-DC conversion units includes a first rectifier bridge unit and a second rectifier bridge unit, where the first rectifier bridge unit has the first input end, the second rectifier bridge unit has the second input end, and an output of the first rectifier bridge unit and an output of the second rectifier bridge unit are connected in series or in parallel to form the output end.

In other implementations, the AC-DC conversion unit may refer to the structure of the first AC-DC conversion unit 13 in the structures shown in fig. 2 and 3, for example. Each AC-DC conversion unit comprises a first rectifier bridge unit, a second rectifier bridge unit and a first DC-DC conversion unit, wherein the first rectifier bridge unit is provided with the first input end, the second rectifier bridge unit is provided with the second input end, the output of the first rectifier bridge unit and the output of the second rectifier bridge unit are connected to the input end of the first DC-DC conversion unit after being connected in series or in parallel, and the output of the first DC-DC conversion unit forms the output end.

In still other implementations, the AC-DC conversion unit may refer to the structure of the first AC-DC conversion unit 13 in the structure shown in fig. 4D, for example. Each AC-DC conversion unit comprises a first rectifying bridge unit and a first DC-DC conversion subunit, and a second rectifying bridge unit and a second DC-DC conversion subunit, wherein the first rectifying bridge unit is provided with the first input end, the output of the first rectifying bridge unit is connected to the input end of the first DC-DC conversion subunit, the second rectifying bridge unit is provided with the second input end, the output of the second rectifying bridge unit is connected to the input end of the second DC-DC conversion subunit, and the output of the first DC-DC conversion subunit and the output of the second DC-DC conversion subunit are connected in series or in parallel to form the output end.

The scheduling of the charging scheduling apparatus may be scheduling of an idle power supply terminal when the total number of the charging devices changes, or reallocating the working states of all power supply terminals. The total number of the charging equipment is changed, and the charging equipment can be charged by connecting new charging equipment, or the charging equipment which is originally charged is disconnected. It should be noted that the total number of the charging devices includes the original charging device and the charging device to be accessed; or the total number of the charging equipment only comprises the charging equipment to be accessed, and the switching can be flexibly carried out according to the actual situation.

Based on the charging system shown in fig. 11B and fig. 14, refer to fig. 15, which is a schematic flowchart of another charging scheduling method provided in the embodiment of the present application. The execution subject of the method shown in fig. 15 may be software and/or hardware, and may be, for example, a charging scheduling device of a charging station or a network contract scheduling system. The charging scheduling method includes steps S201 to S204, which are specifically as follows:

s201, identifying the total number of the charging devices and the number of the transformer pulses 12P.

And S202, when the total number of the charging devices is n × P, distributing the charging devices to the power supply terminals D1-DP in an average manner.

And S203, when the total number of the charging devices is n × P + j, evenly distributing the n × P charging devices to the power supply terminals D1-DP, distributing the j power supply devices to the j power supply terminals in the same power supply device, and preferentially forming 24-pulse rectification charging by the power supply device when the conditions are met.

S204, when the total number of the charging devices is 2n, the charging devices are distributed into n power supply devices, each power supply device selects two power supply ends, and each power supply device forms 24-pulse rectification charging.

The structure of the charging scheduling device in the charging system shown in fig. 11A, 11B, 12, 13, and 14 is similar to that in fig. 9, and is not repeated here.

The embodiment of the present application further provides a readable storage medium, in which a computer program is stored, and the computer program is used for implementing the charging scheduling method provided by the above various embodiments when executed by a processor.

The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media can be any available media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device. The readable storage medium may be a read-only memory (ROM), a random-access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the device may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the device to implement the charging scheduling method provided by the various embodiments described above.

In the above embodiment of the charge scheduling device, it should be understood that the Processor may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply device, comprising: the first winding, the second winding, the third winding, the fourth winding, the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit;

the output end of the first winding pair is connected with the input end of the first alternating current-direct current conversion unit, and the output end of the first alternating current-direct current conversion unit is a first power supply end, wherein the first winding pair comprises the first winding and the second winding, and the first winding and the second winding are used for being arranged on the secondary side of the multi-pulse-wave transformer;

the output end of the second winding pair is connected with the input end of the second alternating current-direct current conversion unit, and the output end of the second alternating current-direct current conversion unit is a second power supply end, wherein the second winding pair comprises a third winding and a fourth winding, and the third winding and the fourth winding are used for being arranged on the secondary side of the multi-pulse transformer;

the phases of the output voltages of the first winding, the third winding, the second winding and the fourth winding are sequentially shifted to the left or shifted to the right by 15 degrees;

when the first power supply end and the second power supply end work simultaneously, the power supply device realizes 24-pulse rectification;

the number of the power supply devices is greater than or equal to 2, and during charging, the charging request of the equipment to be charged is acquired, and the number of the first power supply terminals and the number of the second power supply terminals in a working state are acquired;

2. The power supply device according to claim 1, wherein the first winding is a star winding; the second winding is a triangular winding; the third winding is an extended triangular winding which is shifted left by 15 degrees; the fourth winding is an extended triangular winding which is shifted to the right by 15 degrees.

3. The power supply device according to claim 1 or 2, wherein the first ac-dc conversion unit includes: the rectifier bridge comprises a first rectifier bridge unit and a second rectifier bridge unit;

4. The power supply device according to claim 3, wherein the first ac-dc conversion unit further includes: a first DC-DC conversion unit;

5. The power supply device according to claim 1 or 2, wherein the first ac-dc conversion unit includes: the rectifier bridge comprises a first rectifier bridge unit and a second rectifier bridge unit;

the output ends of the first rectifier bridge unit and the second rectifier bridge unit are connected in parallel to form a first port, and the first port is connected to the first power supply end.

6. The power supply device according to claim 5, wherein the first ac-dc conversion unit further comprises: a first DC-DC conversion unit;

7. The power supply device according to claim 1 or 2, wherein the second ac-dc conversion unit includes: a third rectifier bridge unit and a fourth rectifier bridge unit;

8. The power supply device according to claim 7, wherein the second ac-dc conversion unit further includes: a second DC-DC conversion unit;

9. The power supply device according to claim 1 or 2, wherein the second ac-dc conversion unit includes: a third rectifier bridge unit and a fourth rectifier bridge unit;

10. The power supply device according to claim 9, wherein the second ac-dc conversion unit further includes: a second DC-DC conversion unit;

11. The power supply device according to claim 3, wherein the first rectifier bridge unit and the second rectifier bridge unit are both uncontrolled rectifying rectifier bridge units.

12. The power supply device according to claim 7, wherein the third rectifier bridge unit and the fourth rectifier bridge unit are each an uncontrolled-rectification rectifier bridge unit.

13. The power supply device according to claim 1, further comprising: a power supply switching unit;

the power supply switching unit comprises a first switch component, a second switch component and a third switch component;

the first switch component is connected between the negative electrode of the first power supply end and the positive electrode of the second power supply end;

the second switch component is connected between the positive electrode of the first power supply end and the positive electrode of the second power supply end;

the third switch component is connected between the negative electrode of the first power supply end and the negative electrode of the second power supply end;

wherein the second switch assembly is in linkage with the third switch assembly.

14. The power supply apparatus according to claim 1, wherein if the number of the first power supply terminals is equal to the number of the second power supply terminals, the scheduling one of the first power supply terminals and the second power supply terminals to charge the device to be charged specifically comprises:

15. An electrical charging system, comprising: a multi-pulse transformer and a power supply apparatus as claimed in any one of claims 1 to 14;

16. The charging system of claim 15, wherein the number of power supply devices is greater than or equal to 2.

17. A charge scheduling device, based on the power supply device of any one of claims 1 to 14, the charge scheduling device comprising:

the first processing module is configured to schedule the power supply terminal with the smaller value of the number of the first power supply terminals and the number of the second power supply terminals to charge the device to be charged if the number of the first power supply terminals is not equal to the number of the second power supply terminals;

18. The charging scheduling apparatus of claim 17, wherein the second processing module is configured to obtain the predicted remaining charging time of each first power supply terminal and each second power supply terminal in an operating state if the number of the first power supply terminals is equal to the number of the second power supply terminals; if the power supply end with the minimum estimated charging remaining time is the first power supply end, scheduling the first power supply end to charge the equipment to be charged; and if the power supply end with the minimum estimated charging remaining time is the second power supply end, scheduling the second power supply end to charge the equipment to be charged.

19. An electrical charging system, comprising:

the charging system comprises a multi-pulse-wave transformer, M power supply devices and a charging scheduling device;

winding pairs in the M power supply devices are arranged on the secondary side of the multi-pulse-wave transformer, and the primary winding of the multi-pulse-wave transformer is connected with a power grid;

each of the power supply devices includes:

p ac-dc conversion units corresponding to the P winding pairs one to one, each of the ac-dc conversion units including a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the corresponding first winding, and the second input terminal is connected to the corresponding second winding; and

the phase shift angle between the first winding and the second winding in the same winding pair is 30 degrees, the phase shift angle between the first windings in adjacent winding pairs is 360 degrees/12P, the phase shift angle between the second windings in adjacent winding pairs is 360 degrees/12P, and P is a positive integer greater than or equal to 2;

when the P power supply ends work simultaneously, the power supply device realizes 12P pulse wave rectification;

the charging scheduling device is used for scheduling the states of the power supply ends according to the total number of the charging equipment and the pulse number 12P of the multi-pulse transformer;

the total number of charging devices is n × P + j;

the charging scheduling device is used for scheduling the power supply terminals of n power supply devices to simultaneously supply power to n × P charging equipment from the M power supply devices; and

in the rest M-n power supply devices, scheduling j power supply terminals in one power supply device to supply power for the rest j charging equipment;

wherein n, j is a positive integer and n < M, j < P.

20. The charging system of claim 19, wherein each of the ac-dc conversion units comprises a first rectifier bridge unit and a second rectifier bridge unit, wherein the first rectifier bridge unit has the first input terminal, the second rectifier bridge unit has the second input terminal, and an output of the first rectifier bridge unit and an output of the second rectifier bridge unit are connected in series or in parallel to form the output terminal; or

Each alternating current-direct current conversion unit comprises a first rectifier bridge unit, a second rectifier bridge unit and a first direct current-direct current conversion unit, wherein the first rectifier bridge unit is provided with the first input end, the second rectifier bridge unit is provided with the second input end, the output of the first rectifier bridge unit and the output of the second rectifier bridge unit are connected in series or in parallel and then are connected to the input end of the first direct current-direct current conversion unit, and the output of the first direct current-direct current conversion unit forms the output end; or

Each alternating current-direct current conversion unit comprises a first rectifier bridge unit, a first direct current-direct current conversion subunit, a second rectifier bridge unit and a second direct current-direct current conversion subunit, wherein the first rectifier bridge unit is provided with the first input end, the output of the first rectifier bridge unit is connected to the input end of the first direct current-direct current conversion subunit, the second rectifier bridge unit is provided with the second input end, the output of the second rectifier bridge unit is connected to the input end of the second direct current-direct current conversion subunit, and the output of the first direct current-direct current conversion subunit and the output of the second direct current-direct current conversion subunit are connected in series or in parallel to form the output end.

21. The charging system of claim 19, wherein the total number of charging devices is n x P;

the charging scheduling device is used for scheduling the power supply ends of n power supply devices to simultaneously supply power to the n × P charging devices from the M power supply devices, wherein n is a positive integer and is not more than M.

22. The charging system of claim 19,

the charging scheduling device is used for scheduling j/2 groups of power supply terminals in one power supply device to supply power for the remaining j charging devices in the remaining M-n power supply devices, wherein P power supply terminals in the one power supply device are divided into P/2 groups, each group comprises a k ' th power supply terminal and a k ' + P/2 th power supply terminal, k ' =1 … P/2, P is an even number greater than 2, and j is an even number.

23. The charging system according to claim 19, wherein the total number of charging devices is 2 n;

the P power supply terminals in each power supply device are divided into P/2 groups, each group comprises a k ' power supply terminal and a k ' + P/2 power supply terminal, k ' =1 … P/2, and P is an even number;

the charging scheduling device is used for scheduling n power supply devices from the M power supply devices, selecting a group of power supply terminals in each power supply device, and supplying power to the 2n charging devices, wherein n is a positive integer and is not more than M.