CN113609682B - Direct current contactor control system and method in charging topology network and charging system - Google Patents

Abstract

The invention belongs to the technical field of power electronics, and discloses a charging topology network, a direct current contactor control system in a charging system and a method thereof, wherein the charging topology network comprises the following components: a plurality of groups of power modules, a plurality of groups of direct current contactors and a plurality of groups of terminals; the multiunit direct current contactor includes: a plurality of groups of first direct current contactors, a plurality of groups of second direct current contactors and a plurality of groups of main direct current contactors; the multiple groups of power modules consist of at least two groups of power modules; each group of power modules is connected with at least one group of first direct current contactors, and the groups of first direct current contactors are connected in series to form an annular structure; each group of power modules is connected with a corresponding terminal through a group of main direct current contactors respectively; each group of power modules is electrically connected with the direct current contactor connected with any group of non-adjacent power modules on the annular structure through a group of second direct current contactors. According to the invention, the power pool of the terminal is formed by sucking different contactors to form a power module which is not connected with a through channel, so that the purpose of power switching is achieved.

Description

Direct current contactor control system and method in charging topology network and charging system

Technical Field

The invention belongs to the technical field of power electronics, and particularly relates to a direct current contactor control system and method in a charging topology network and a charging system.

Background

With the rapid development of various electric equipment, charging equipment is more and more. For example, the development planning of an electric automobile as a new energy automobile becomes a great project for saving energy, reducing emission and promoting industrial upgrading. The charging equipment supplies energy for the electric equipment, and becomes an important supporting system of the electric equipment.

In recent years, high-power flexible intelligent charging systems gradually develop, various matrix loops built by direct current contactors are more and more, the output power of the existing charging system is certain when the charging system is used, proper power cannot be output according to different requirements, and a control method for accurately adjusting the output power of the charging system is lacked.

Disclosure of Invention

The invention aims to provide a charging topological network and a direct current contactor control system and method in a charging system, so as to solve the technical problem of unstable charging caused in the terminal power distribution process, and the charging relay can be accurately and dynamically adjusted to switch according to the change of module distribution attribute on the premise of ensuring absolute safety of the system so as to ensure that all terminals of the system are stably charged, thereby ensuring that the system outputs in an optimal state.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a charging topology network comprising:

a plurality of groups of power modules, a plurality of groups of direct current contactors and a plurality of groups of terminals;

the multi-group direct current contactor comprises: a plurality of groups of first direct current contactors, a plurality of groups of second direct current contactors and a plurality of groups of main direct current contactors;

the multiple groups of power modules consist of at least two groups of power modules;

each group of power modules is connected with at least one group of first direct current contactors, and the plurality of groups of first direct current contactors are connected in series to form an annular structure; each group of power modules is connected with a corresponding terminal through a group of main direct current contactors respectively;

and each group of power modules is electrically connected with the direct current contactor connected with any group of non-adjacent power modules on the annular structure through a group of second direct current contactors.

The invention is further improved in that: the power modules are electrically connected with the main direct current contactors connected with any one group of non-adjacent power modules on the annular structure through a group of second direct current contactors to form a star-shaped structure.

The invention is further improved in that: the number of the terminals is the same as the number of the main direct current contactors.

The invention is further improved in that: when the power modules are even, and the power modules are uniformly arranged on the annular structure, each group of power modules is electrically connected with a main direct current contactor connected with one group of other power modules on the positive diagonal position of the annular structure through one group of second direct current contactors.

The invention is further improved in that: the charging of each terminal consists of three large channels, and each large channel consists of two small branches.

The invention is further improved in that: the multiunit direct current contactor includes: a plurality of groups of first direct current contactors K1, K2, K3, K4, K5 and K6; a plurality of groups of second DC contactors K7, K8 and K9 and a plurality of groups of main DC contactors Km1, km2, km3, km4, km5 and Km6;

the power modules comprise power modules P1, P2, P3, P4, P5 and P6;

the first direct current contactors K1, K2, K3, K4, K5 and K6 are connected in series to form an annular structure; the power modules P1, P2, P3, P4, P5 and P6 are respectively connected with corresponding terminals M1, M2, M3, M4, M5 and M6 through a group of main direct current contactors Km1, km2, km3, km4, km5 and Km6;

the power module P1 is connected with the power module P4 through a second direct current contactor K7; the power module P2 is connected with the power module P3 through a second direct current contactor K8; the power module P3 is connected to the power module P6 through the second dc contactor K9.

In a second aspect, the present invention provides a dc contactor control system in a charging system, including: a charging topology network and a controller; the controller includes:

terminal distribution module: distributing a proper power module according to the power required by each terminal;

the corresponding module: according to the distributed power modules, the closing condition of the direct current contactor under the corresponding power module is obtained;

and a terminal checking module: checking the data obtained by the corresponding module according to the checking principle of each terminal to obtain the closing condition of the contactor of the terminal;

and a system integration module: integrating the closing conditions of the contactors of all terminals to obtain the closing condition of the direct current contactor under each terminal;

and a system verification module: and according to a system verification principle, verifying the data obtained by the system integration module to obtain a final system execution result.

In a third aspect, the present invention provides a control method of a dc contactor control system in a charging system, including the steps of:

obtaining a power module distribution result of each terminal;

according to the distributed power modules, obtaining the closing expectation of the direct current contactor corresponding to each power module;

judging the closing of each power module and the direct current contactor of the terminal according to a terminal verification principle to obtain a desired result of the terminal;

integrating expected results of all terminals to obtain expected results of the system;

and judging the expected result of the system according to the system verification principle to obtain the final execution result of the system.

The invention is further improved in that: the terminal verification principle means that the same contactor with suction expectations under the terminal can only have one suction state and one disconnection state which are unknown when corresponding to different power modules, and the contactor meeting the principle expects suction in the terminal, and the other conditions are disconnected.

The invention is further improved in that: the system verification principle means that the same contactor with suction expectations in each terminal has only one suction state and one disconnection state which are unknown when corresponding to different terminals, and the contactor meeting the principle expects suction in the system, and the other conditions are disconnected.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the power pool of the terminal is formed by sucking different contactors to form the power module with the blind channel connected, so that the power switching purpose is achieved, and the dynamic switching of charging in a high-power charging system can be realized to ensure the stable operation of the system.

2. The control method can effectively identify the safety risk caused by system abnormality due to command processing errors in advance through two verification modes and refuses to execute the protection system, thereby effectively improving the running stability and the running efficiency of the system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of a charging topology network according to the present invention;

FIG. 2 is a block diagram of a DC contactor control system in a charging system;

fig. 3 is a schematic diagram of a method for processing a wish list of any terminal Mi according to the present invention;

fig. 4 is a schematic power diagram of the terminal M1 in the dc contactor control system in the charging system.

Detailed Description

The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.

Example 1:

as shown in fig. 1, the charging topology network in the present invention includes: a plurality of groups of power modules, a plurality of groups of direct current contactors and a plurality of groups of terminals;

the multiunit direct current contactor includes: a plurality of groups of first direct current contactors K1, K2, K3, K4, K5 and K6; a plurality of groups of second DC contactors K7, K8 and K9 and a plurality of groups of main DC contactors Km1, km2, km3, km4, km5 and Km6;

the power modules comprise power modules P1, P2, P3, P4, P5 and P6; the first direct current contactors K1, K2, K3, K4, K5 and K6 are connected in series to form an annular structure; the power modules P1, P2, P3, P4, P5 and P6 are respectively connected with corresponding terminals M1, M2, M3, M4, M5 and M6 through a group of main direct current contactors Km1, km2, km3, km4, km5 and Km6;

each group of power modules is electrically connected with the main direct current contactor connected with any group of non-adjacent power modules on the annular structure through a group of second direct current contactors.

The power module is electrically connected with the main direct current contactor connected with a group of other power modules on the annular structure through a group of second direct current contactors, so that a star-shaped structure can be formed.

The number of terminals may be six and the number of main dc contactors is the same as the terminals.

The number of the power modules is six, and the power modules are uniformly arranged on the annular structure; the power module P1 is connected with the power module P4 through a second direct current contactor K7; the power module P2 is connected with the power module P3 through a second direct current contactor K8; the power module P3 is connected to the power module P6 through the second dc contactor K9.

As shown in fig. 4, taking M1 as an example, in charging of the terminal M1, the first dc contactor has six groups of K1, K2, K3, K4, K5 and K6, the number of power modules is six, the first charging power unit may be represented by P1, P2, P3, P4, P5 and P6, the main dc contactor may be represented by Km1, km2, km3, km4, km5 and Km6, the number of terminals is six, and K1, P2, K2, P3, K3, P4, P5, P6, K6 and P12 are respectively represented by M1, M2, M3, M4, M5 and M6, so as to form a ring structure.

The charging of the terminal M1 consists of three large channels, namely a channel 1 consisting of K6 has branches of K6-K5 and K6-K9, a channel 2 consisting of K1 has branches of K1-K8 and K1-K2, and a channel 3 consisting of K7 has branches of K7-K4 and K7-K3; each channel consists of 2 branches, and finally, the power pool of the terminal M1 is formed by connecting different power modules through the channels which are not communicated by sucking different contactors, so that the purpose of power switching is achieved, and the charging of each terminal is similar to that of the other terminals, and the detailed description is omitted.

Example 2

Referring to fig. 2, a dc contactor control system in a charging system includes: the charging topology network and controller of embodiment 1; the controller includes:

terminal distribution module: distributing a proper power module according to the power required by each terminal;

the corresponding module: according to the distributed power modules, the closing condition of the direct current contactors K1-K9 under the corresponding power modules is obtained;

and a terminal checking module: checking the data obtained by the corresponding module according to the checking principle of each terminal to obtain the closing condition of the contactor of the terminal;

and a system integration module: integrating the closing conditions of the contactors of all terminals to obtain the closing conditions of the DC contactors K1-K9 under each terminal;

and a system verification module: and according to a system verification principle, verifying the data obtained by the system integration module to obtain a final system execution result.

Example 3

Referring to fig. 3, the present invention provides a control method of a dc contactor control system in a charging system, comprising the following steps:

obtaining a power module distribution result of each terminal;

according to the distributed power modules, obtaining the closing expectation of the direct current contactor corresponding to each power module;

judging the closing of each power module and the direct current contactor of the terminal according to a terminal verification principle to obtain a desired result of the terminal;

integrating expected results of all terminals to obtain expected results of the system;

and judging the expected result of the system according to the system verification principle to obtain the final execution result of the system.

In the invention, the terminal verification principle means that the same contactor with suction expectations under the terminal can only have one suction state and one disconnection state which are unknown when corresponding to different power modules, and the contactor meeting the principle is expected to be suction in the terminal, and the other conditions are disconnected;

in the invention, the system verification principle means that only one contactor with suction expectations exists in each terminal when corresponding to different terminals, and only one suction state and the rest of one disconnection state are unknown, and the contactor meeting the principle is expected to be suction in the system, and the rest of the contactors are disconnected;

and the i-number terminal Mi respectively checks the relation table of the matched power module and the contactors according to the distribution result Px of the power module of the terminal Mi per se to obtain an expected result table of 9 contactors.

For example: the distribution result of the terminal module M1 is as follows: p1, P4, P6; the table look-up can be obtained and the contactor expected results are shown in table 2 below:

in the table, C represents closed, O represents open, and U represents unknown.

TABLE 1

TABLE 2

As shown in fig. 4, the correspondence between the modules and the contactors in the M1 terminal may be determined, that is, the contactor of the upper stage that needs to be attracted when one power module needs to be allocated, and the contactor of the lower stage that is disconnected, so as to obtain the relationship between the power module and the contactor matched in table 1. Wherein the presence of multiple inhalations requires the selection of a correct result inside, namely, whether the power modules at the two ends of the contactor are distributed uniformly or not is determined, and if the distribution is uniform, the contactor is considered to be capable of attracting the passage to be communicable.

And verifying a contactor command in the current terminal Mi contactor table according to the terminal Mi contactor table to obtain a contactor expectation of the terminal Mi. The verification method comprises the following steps: only one of the modules corresponding to each contactor desired to be engaged and one of the modules to be disengaged are unknown, i.e., only one contactor is desired to be engaged by one module. The requirement is met, namely the suction is needed, and the rest are all the disconnection instructions. And obtaining the final Mi terminal expected instruction.

The following description will take Table 1 as an example. Judging each row of contactors of the terminal M1, checking whether the suction expectation exists, if so, only one contactor of the K6 rows is required to be sucked, if so, only one contactor of the K6 rows is required to be disconnected, and the rest contactors are unknown, wherein K6 is set to be sucked, and similarly K7 is set to be sucked, as shown in the table 3. The expected results of the resulting M1 terminal are shown in table 4.

TABLE 3 Table 3

It can be seen that K6, K7 expect the actuation command to be unique.

TABLE 4 Table 4

Terminal

K1

K2

K3

K4

K5

K6

K7

K8

K9

M1

O

O

O

O

O

C

C

O

O

And summarizing the contactor instructions of each terminal Mi to obtain the expected instructions of the system.

For example, all terminals of the system expect as shown in table 5:

TABLE 5

Terminal

K1

K2

K3

K4

K5

K6

K7

K8

K9

M1

O

O

O

O

O

C

C

O

O

M2

O

O

O

O

O

O

O

O

O

M3

O

O

O

O

O

O

O

O

O

M4

O

O

O

O

O

O

O

O

O

M5

O

O

O

O

O

O

O

O

O

M6

O

O

O

O

O

O

O

O

O

Judging each contactor in a system expected instruction list, wherein the judging principle is as follows: each contactor actuation can only be initiated by one terminal, and if multiple terminals are initiated, the instruction is disabled. And obtaining a final execution result of the system.

The actual execution action command of each contactor in the final system is obtained by judging based on the expected instruction list of the system in the table 5. The actual execution command is shown in table 6.

TABLE 6

The judging process is as follows: and traversing each column respectively to check whether an actuation command exists, if the actuation command is unique, obtaining that the contactor is actuated, otherwise, setting the corresponding contactor to be disconnected, as shown in table 7.

TABLE 7

Terminal

K1

K2

K3

K4

K5

K6

K7

K8

K9

M1

O

O

O

O

O

C

C

O

O

M2

O

O

O

O

O

O

O

O

O

M3

O

O

O

O

O

O

O

O

O

M4

O

O

O

O

O

O

O

O

O

M5

O

O

O

O

O

O

O

O

O

M6

O

O

O

O

O

O

O

O

O

It can be seen that K6, K7 are intended to be unique to the actuation terminal.

It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (6)

1. The control method of the direct current contactor control system in the charging system is characterized in that the direct current contactor control system in the charging system comprises the following steps: a charging topology network and a controller;

a charging topology network, comprising: a plurality of groups of power modules, a plurality of groups of direct current contactors and a plurality of groups of terminals; the multi-group direct current contactor comprises: a plurality of groups of first direct current contactors, a plurality of groups of second direct current contactors and a plurality of groups of main direct current contactors; the multiple groups of power modules consist of at least two groups of power modules; each group of power modules is connected with at least one group of first direct current contactors, and the groups of first direct current contactors are connected in series to form an annular structure; each group of power modules is connected with a corresponding terminal through a group of main direct current contactors respectively; each group of power modules is electrically connected with the direct current contactor connected with any group of non-adjacent power modules on the annular structure through a group of second direct current contactors;

the controller includes:

terminal distribution module: distributing a proper power module according to the power required by each terminal;

the corresponding module: according to the distributed power modules, the closing condition of the direct current contactor under the corresponding power module is obtained;

and a terminal checking module: checking the data obtained by the corresponding module according to the checking principle of each terminal to obtain the closing condition of the contactor of the terminal;

and a system integration module: integrating the closing conditions of the contactors of all terminals to obtain the closing condition of the direct current contactor under each terminal;

and a system verification module: according to a system verification principle, verifying data obtained by a system integration module to obtain a final system execution result;

the control method comprises the following steps:

obtaining a power module distribution result of each terminal;

according to the distributed power modules, obtaining the closing expectation of the direct current contactor corresponding to each power module;

judging the closing of each power module and the direct current contactor of the terminal according to a terminal verification principle to obtain a desired result of the terminal;

integrating expected results of all terminals to obtain expected results of the system;

judging the expected result of the system according to a system verification principle to obtain the final execution result of the system;

the terminal verification principle means that the same contactor with suction expectations under the terminal can only have one suction state and one disconnection state which are unknown when corresponding to different power modules, and the contactor meeting the principle expects suction in the terminal, and the other conditions are disconnected;

the system verification principle means that the same contactor with suction expectations in each terminal has only one suction state and one disconnection state which are unknown when corresponding to different terminals, and the contactor meeting the principle expects suction in the system, and the other conditions are disconnected.

2. The control method according to claim 1, wherein the power modules are electrically connected to the main dc contactors connected to any one of the non-adjacent power modules on the ring structure through a set of second dc contactors to form a star structure.

3. The control method according to claim 1, wherein the number of terminals is the same as the number of main dc contactors.

4. The control method according to claim 1, wherein when the power modules are even in number and the power modules are uniformly arranged on the ring structure, each group of power modules is electrically connected to a main dc contactor connected to a group of other power modules on a diagonal position on the ring structure through a group of second dc contactors.

5. The control method according to claim 1, wherein the charging of each terminal is composed of three large channels, and each large channel is composed of two small branches.

6. The control method according to claim 1, wherein the plurality of sets of dc contactors include: a plurality of groups of first direct current contactors K1, K2, K3, K4, K5 and K6; a plurality of groups of second DC contactors K7, K8 and K9 and a plurality of groups of main DC contactors Km1, km2, km3, km4, km5 and Km6;

the power modules comprise power modules P1, P2, P3, P4, P5 and P6;

the first direct current contactors K1, K2, K3, K4, K5 and K6 are connected in series to form an annular structure; the power modules P1, P2, P3, P4, P5 and P6 are respectively connected with corresponding terminals M1, M2, M3, M4, M5 and M6 through a group of main direct current contactors Km1, km2, km3, km4, km5 and Km6;

the power module P1 is connected with the power module P4 through a second direct current contactor K7; the power module P2 is connected with the power module P5 through a second direct current contactor K8; the power module P3 is connected to the power module P6 through the second dc contactor K9.