Relay group control method and system for split type direct current charging pile

Abstract

The invention relates to a relay group control method and system for a split type direct current charging pile, and the method comprises the steps: 1, setting a switch control module and a power control module which is in communication connection with the switch control module, the power control module is used for calculating relays needing to act in the relay group; 2, the power control module sends a remote control command frame to the switch control module; step 3, after the switch control module receives the remote control command frame, turning to step 4; 4, analyzing the received remote control command frame to obtain the total number of relays to be controlled and the sequence number of an initial switch; and 5, controlling the relays in the relay group in sequence according to the offset of the initial switch sequence number, and sending a remote control response frame to the power control module by the switch control module. The method can realize relay group control and feedback detection so as to ensure normal use of the charging gun.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a relay group control method and system for a split-type direct current charging pile. Background Art

[0002] As the market share of electric vehicles increases, the development of DC charging piles, as important charging facilities for electric vehicles, is crucial to the sustainable development of the electric vehicle industry. Split DC charging piles can also be called group charging systems or flexible charging piles. They are composed of split DC chargers and DC charging terminals. Since the split charging piles design the charging output and DC power unit separately, the number of charging guns configured for each DC power unit can be increased to 6 guns, 8 guns, or even 12 guns, etc., thereby achieving the effect of group charging. With the increase of the maximum charging power of the split type or the expansion of the number of charging guns, the number of charging power modules required is also gradually increasing. Different charging power modules need to be controlled by a large number of DC relays to connect different modules in parallel to the designated charging guns, thereby achieving high-power fast charging. Therefore, the control and detection of DC relay groups are crucial.

[0003] In the prior art, the relays of split-type DC charging piles mostly use full-matrix connection to ensure that each power module can be connected in parallel to any charging gun, thereby improving the utilization rate of the power module. Through the switching control of the relay, the binding group power modules of other idle charging guns can be borrowed to reduce the total number of power modules. However, due to the closing and opening of the relays under high voltage and high current during the charging process, coupled with the large number of relays, relay failures are inevitable. At this time, the corresponding charging gun will report a fault and cannot be used. The relay must be replaced before it can be used normally; in addition, due to the use of a full-matrix connection, the specific faults of the relays should be subdivided to ensure that the abnormality of a certain relay does not affect the use of the charging gun without affecting safety, but the specific faults of the relays cannot be clearly identified in the prior art. For this reason, further improvements to the prior art are needed. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a relay group control method for a split-type DC charging pile, which can realize relay group control and feedback detection to ensure the normal use of the charging gun, in view of the above-mentioned prior art.

[0005] The second technical problem to be solved by the present invention is to provide a control system for executing the above-mentioned relay group control method for a split-type DC charging pile.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a relay group control method for a split-type DC charging pile, characterized by comprising the following steps:

[0007] Step 1, setting a switch control module and a power control module that is communicatively connected to the switch control module, wherein the switch control module is used to control the action of the relay, and the power control module is used to calculate the relays that need to be acted in the relay group;

[0008] Step 2: The power control module sends a remote control command frame to the switch control module;

[0009] Step 3: After the switch control module receives the remote control command frame, it proceeds to step 4;

[0010] Step 4: Parse the received remote control command frame to obtain the total number of relays to be controlled and the starting switch sequence number;

[0011] Step 5: Control the relays in the relay group in sequence according to the starting switch sequence number offset, and the switch control module sends a remote control response frame to the power control module.

[0012] As an improvement, at least part of the bytes in the remote control command frame are control signal bytes, each control signal byte includes control signals of i relays, and i is a positive integer greater than 1.

[0013] Preferably, the value of i is 4.

[0014] Specifically, the remote control command frame includes multiple bytes, the first byte is used to indicate the total number i of relays to be controlled, the second byte is used to indicate the starting switch number n, the third byte indicates the control signal of the nth relay to the n+3th relay, the fourth byte indicates the control signal of the n+4th relay to the n+7th relay, and so on.

[0015] Preferably, the remote control response frame has the same length as the remote control command frame.

[0016] In order to realize the control of the power control module, the switch control module also periodically sends a telesignaling data frame to the power control module after power-on, so that the power control module parses the telesignaling data frame to obtain the status of each relay in the current relay group.

[0017] Specifically, the specific composition of the remote signaling data frame is:

[0018] The switch control module periodically reads the feedback signals of all relays, and fills in the relay status data valid identification, the total number of relays to be controlled and the feedback signals of each relay in the data frame according to the feedback signals of all relays, and finally composes the telesignal message according to the telesignal format.

[0019] Specifically, the telesignaling data frame includes a plurality of bytes for indicating switch working states, each byte for indicating switch working states includes control signals of two relays, and the control signal of each relay includes a positive switch working state and a negative switch working state.

[0020] Preferably, the positive switch working state and the negative switch working state both include four states: normal switch disconnection, normal switch closure, switch disconnection refusal to operate, and switch closure adhesion.

[0021] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a relay group control system for a split-type DC charging pile, characterized in that it is used to execute the relay group control method for a split-type DC charging pile as mentioned above.

[0022] Compared with the prior art, the advantages of the present invention are: on the one hand, a communication connection is established between the power control module and the switch control module, so that the total number of relays to be controlled and the starting switch number are set by using the remote control command frame, so as to adapt to split DC charging piles of different models; and the control signals of multiple relays are included in one byte of data, so that the length of the control message can be reduced to reduce the link transmission burden and realize the control of multiple relays in the relay group; on the other hand, the switch control module sends a remote signal data frame to the power control module, so that the power control module can obtain the status of each relay in the current relay group to ensure that the abnormality of a certain relay does not affect the use of the charging gun without affecting safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Flow chart of a relay group control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the relay group control method for a split-type DC charging pile in this embodiment includes the following steps:

[0026] Step 1, setting a switch control module and a power control module that is communicatively connected to the switch control module, wherein the switch control module is used to control the action of the relay, and the power control module is used to calculate the relays that need to be acted in the relay group;

[0027] Step 2: The power control module sends a remote control command frame to the switch control module;

[0028] Step 3: After the switch control module receives the remote control command frame, it proceeds to step 4;

[0029] Step 4: Parse the received remote control command frame to obtain the total number of relays to be controlled and the starting switch sequence number;

[0030] Step 5: Control the relays in the relay group in sequence according to the starting switch sequence number offset, and the switch control module sends a remote control response frame to the power control module.

[0031] At least part of the bytes in the remote control command frame are control signal bytes, each control signal byte includes control signals of i relays, where i is a positive integer greater than 1; in this embodiment, the value of i is 4.

[0032] The remote control command frame in this embodiment includes multiple bytes, the first byte is used to indicate the total number i of relays to be controlled, the second byte is used to indicate the starting switch number n, the third byte indicates the control signal of the nth relay to the n+3th relay, the fourth byte indicates the control signal of the n+4th relay to the n+7th relay, and so on.

[0033] In addition, the length of the remote control response frame is the same as that of the remote control command frame. The remote control command frame in this embodiment is shown in Table 1 below, and the remote control response frame is shown in Table 2 below.

[0034] Table 1 Remote control command frame

[0035]

[0036] Among them, ((i%4)==0?0:1) means: if (i%4)==0 is true, then the result of the expression ((i%4)==0?0:1) is 0; if (i%4)==0 is not true, then the result of the expression ((i%4)==0?0:1) is 1; in addition, the % in i%4 represents the remainder operation, and (i%4)==0 means that the remainder of i divided by 4 is 0.

[0037] Table 2 Remote control response frame

[0038]

[0039] In this embodiment, after the switch control module is powered on, it also periodically sends a telesignaling data frame to the power control module, so that the power control module parses the telesignaling data frame and obtains the status of each relay in the current relay group.

[0040] The specific composition of the remote signaling data frame is as follows:

[0041] The switch control module periodically reads the feedback signals of all relays, and fills the relay state data valid identification, the total number of relays to be controlled and the feedback signals of each relay in the data frame according to the feedback signals of all relays, and finally forms a telesignal message according to the telesignal format. In this embodiment, the relay state data valid identification includes positive pole valid, negative pole valid and both positive and negative poles valid, wherein the positive pole valid indicates that the DC contactor is only connected to the positive bus copper bar, the negative pole valid indicates that the DC contactor is only connected to the negative bus copper bar, and the positive and negative poles are both valid. The situation where the DC contactor is adapted is connected to the negative bus copper bar, and the positive and negative poles are both valid.

[0042] The telesignaling data frame includes a plurality of bytes for indicating the switch working state, each byte for indicating the switch working state includes the control signals of two relays, and the control signal of each relay includes the positive switch working state and the negative switch working state. The positive switch working state and the negative switch working state in this embodiment both include four states: normal switch disconnection, normal switch closure, switch disconnection refusal and switch closure adhesion. The telesignaling data frame in this embodiment is shown in Table 3 below.

[0043] Table 3 Telesignaling data frame

[0044]

[0045]

[0046] The present embodiment also relates to a relay group control system for a split-type DC charging pile, and the relay group control system is used to execute the relay group control method for a split-type DC charging pile as described above.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A relay group control method for a split DC charging pile, characterized in that The steps include: Step 1, setting a switch control module and a power control module that is communicatively connected to the switch control module, wherein the switch control module is used to control the action of the relay, and the power control module is used to calculate the relays that need to be acted in the relay group; Step 2: The power control module sends a remote control command frame to the switch control module; Step 3: After the switch control module receives the remote control command frame, it proceeds to step 4; Step 4: Parse the received remote control command frame to obtain the total number of relays to be controlled and the starting switch sequence number; Step 5: Control the relays in the relay group in sequence according to the starting switch sequence number offset, and the switch control module sends a remote control response frame to the power control module.

2. The relay group control method according to claim 1, characterized in that: At least part of the bytes in the remote control command frame are control signal bytes, each control signal byte includes control signals of i relays, and i is a positive integer greater than 1.

3. The relay group control method according to claim 2, characterized in that: The value of i is 4.

4. The relay group control method according to claim 3, characterized in that: The remote control command frame includes multiple bytes, the first byte is used to indicate the total number i of relays to be controlled, the second byte is used to indicate the starting switch number n, the third byte indicates the control signal of the nth relay to the n+3th relay, the fourth byte indicates the control signal of the n+4th relay to the n+7th relay, and so on.

5. The relay group control method according to claim 3, characterized in that: The remote control response frame has the same length as the remote control command frame.

6. The relay group control method according to any one of claims 1 to 5, characterized in that: After the switch control module is powered on, it also periodically sends a telesignaling data frame to the power control module, so that the power control module parses the telesignaling data frame and obtains the status of each relay in the current relay group.

7. The relay group control method according to claim 6, characterized in that: The specific composition of the remote signaling data frame is as follows: The switch control module periodically reads the feedback signals of all relays, and fills in the relay status data valid identification, the total number of relays to be controlled and the feedback signals of each relay in the data frame according to the feedback signals of all relays, and finally composes the telesignal message according to the telesignal format.

8. The relay group control method according to claim 7, characterized in that: The remote signaling data frame includes a plurality of bytes for indicating the switch working state, each byte for indicating the switch working state includes control signals of two relays, and the control signal of each relay includes the positive switch working state and the negative switch working state.

9. The relay group control method according to claim 8, characterized in that: The positive switch working state and the negative switch working state both include four states: normal switch disconnection, normal switch closure, switch disconnection refusal to operate, and switch closure adhesion.

10. A relay group control system for a split DC charging pile, characterized in that: Used to execute the relay group control method for a split-type DC charging pile as described in any one of claims 1 to 9 above.

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