Mobile storage battery pack access device of transformer substation

Abstract

The invention provides a transformer substation mobile storage battery pack access device, and relates to the field of transformer substations, the transformer substation mobile storage battery pack access device comprises an access control module, a voltage acquisition module, a load module and a controller, the access control module comprises a switching device, the voltage acquisition module comprises a first voltage acquisition circuit, and the load module comprises a load, a load current acquisition circuit and the controller. And the controller is electrically connected with the switching device, the first voltage acquisition circuit, the load and the load current acquisition circuit. According to the access device for the mobile storage battery pack of the transformer substation, whether the mobile storage battery pack works normally or not is judged by acquiring the internal resistance of the mobile storage battery pack, when the mobile storage battery pack can work normally, the mobile storage battery pack is accessed to a direct current system of the transformer substation, and when the mobile storage battery pack cannot work normally, the mobile storage battery pack is accessed to the direct current system of the transformer substation. And the mobile storage battery pack which cannot work normally is prevented from being connected to the substation direct current system, so that the normal operation of the substation direct current system is ensured.

Description

Technical Field

[0001] The present application relates to the field of substations, and in particular to a mobile battery pack access device for a substation. Background Art

[0002] The substation DC system is the core component to ensure the safe and reliable operation of the power system. It provides power for relay protection devices, circuit breaker opening and closing operations, signal equipment, automatic devices, etc. The substation DC system is electrically connected to the substation DC system and the battery pack. The substation AC system and the battery pack respectively supply power to the substation DC system. When the AC power supply of the substation AC system is interrupted, the substation DC system is powered by the battery pack.

[0003] The battery pack is charged by a charging module. According to the power regulations, the battery pack needs to be maintained and capacity checked regularly. During the capacity check of the battery pack, the battery pack is disconnected from the substation DC system. At this time, the mobile battery pack needs to be connected to the substation DC system. At this time, the mobile battery pack supplies power to the substation DC system.

[0004] After the mobile battery pack is connected to the substation DC system, it is impossible to determine whether the mobile battery pack is working normally. If an abnormal mobile battery pack is connected to the substation DC system, the normal operation of the substation DC system will be affected. Summary of the invention

[0005] The present application provides a substation mobile battery group access device, which is used to solve the technical problem that after the existing mobile battery group is connected to the substation DC system, it is impossible to determine whether the mobile battery group is working normally.

[0006] A first aspect of an embodiment of the present application provides a mobile battery group access device for a substation, comprising:

[0007] An access control module, comprising a switch device, the switch device being used to electrically connect the mobile battery pack and the substation DC system;

[0008] A voltage acquisition module, comprising a first voltage acquisition circuit, wherein the first voltage acquisition circuit is used to be electrically connected to the mobile storage battery pack to acquire voltage information output by the mobile storage battery pack and convert the voltage information into a first data signal;

[0009] A load module, comprising a load and a load current acquisition circuit, wherein the load is used to be electrically connected to the mobile storage battery pack, and the load current acquisition circuit is electrically connected to the load to collect the current of the load and convert the current into a second data signal;

[0010] The controller is electrically connected to the switch device, the first voltage acquisition circuit, the load and the load current acquisition circuit, respectively. The controller is used to turn on and off the load and obtain the internal resistance of the mobile battery pack according to the first data signal and the second data signal. When the internal resistance is greater than or equal to a preset internal resistance threshold, the controller controls the switch device to disconnect, and when the internal resistance is less than the preset internal resistance threshold, the controller controls the switch device to connect.

[0011] In a possible implementation, it further includes a current acquisition module and a human-computer interaction module, wherein the current acquisition module includes a first current acquisition circuit electrically connected to the controller, and the human-computer interaction module is electrically connected to the controller;

[0012] The first current acquisition circuit is used to be electrically connected to the mobile battery pack to collect current information of the mobile battery pack, and convert the current information of the mobile battery pack into a third data signal and transmit it to the controller. The controller controls the human-computer interaction module to display the current information of the mobile battery pack.

[0013] In a possible implementation, the access control module further includes a current control unit electrically connected to the controller, and the current control unit is used to be electrically connected to the mobile battery pack to control the charging and discharging current of the mobile battery pack;

[0014] The controller controls the current control unit based on the predetermined current value preset by the human-computer interaction module, so that the charging and discharging current of the mobile battery pack is the same as the predetermined current value.

[0015] In a possible implementation, the current acquisition module also includes a second current acquisition circuit electrically connected to the controller, and the second current acquisition circuit is used to electrically connect to the battery group of the substation DC system to collect current information of the battery group, and convert the current information of the battery group into a fourth data signal and transmit it to the controller. The controller controls the current control unit based on the third data signal and the fourth data signal so that the charging and discharging current of the mobile battery group is the same as the charging and discharging current of the battery group.

[0016] In a possible implementation, the first voltage acquisition circuit includes a voltage dividing resistor, a filter circuit, and a first analog-to-digital converter electrically connected in sequence;

[0017] The voltage dividing resistor is used to be electrically connected to the mobile battery pack, and the voltage dividing resistor is used to convert the voltage information output by the mobile battery pack into low voltage information;

[0018] The filtering circuit is used to filter the low voltage information;

[0019] The first analog-to-digital converter is used to convert the low voltage information that has been filtered into the first data signal, and transmit the first data signal to the controller.

[0020] In a possible implementation, the first current acquisition circuit includes a current sensor, a voltage divider circuit, a second-order filter circuit, a voltage regulation circuit, and a second analog-to-digital converter that are electrically connected in sequence;

[0021] The current sensor is used to be electrically connected to the mobile battery pack, and the current sensor is used to convert the current information of the mobile battery pack into an analog signal;

[0022] The voltage divider circuit is used to reduce the voltage of the analog signal to obtain a low-voltage analog signal;

[0023] The second-order filter circuit is used to filter the low-voltage analog signal;

[0024] The voltage regulating circuit is used to raise the low voltage analog signal after filtering;

[0025] The second analog-to-digital converter is used to convert the boosted low voltage analog signal into the third data signal, and transmit the third data signal to the controller.

[0026] In a possible implementation, it also includes an alarm device and an internal emergency power supply, the internal emergency power supply is used to be electrically connected to the substation DC system, the alarm device and the internal emergency power supply are both electrically connected to the controller, and when the first data signal is less than a predetermined voltage value preset by the human-computer interaction module, the controller controls the alarm device to sound an alarm and controls the internal emergency power supply to start, so that the internal emergency power supply supplies power to the substation DC system.

[0027] In a possible implementation, it also includes a battery access module, the battery access module includes a wiring terminal and a connecting component, one end of the switch device is electrically connected to the mobile battery pack, and the other end of the switch device is electrically connected to the wiring terminal, the connecting component includes a contact guide, a locking assembly and a lead-out conductive member, one end of the lead-out conductive member is electrically connected to the wiring terminal, and the other end of the lead-out conductive member is conductively connected to the contact guide, the contact guide is used to be conductively connected to the DC bus of the substation DC system, and the locking assembly is arranged on the contact guide to lock the DC bus on the contact guide.

[0028] In a possible implementation, the contact guide is a conductive plate, the locking assembly includes a mounting plate and an abutment rod, the lead-out conductive member is a lead-out wire, one side of the conductive plate is used for conductive connection with the DC bus, the mounting plate is fixed on the conductive plate, and an installation gap is formed between the mounting plate and the conductive plate, the installation gap is used for installing the DC bus, the abutment rod is arranged on the mounting plate, the abutment rod is used to abut against the DC bus so that the DC bus abuts between the conductive plate and the abutment rod, and the lead-out wire is conductively connected to the conductive plate.

[0029] In a possible implementation, the contact guide member includes a spring clip, the locking assembly is a telescopic rod, the lead-out conductive member is a lead-out wire, the jaws of the spring clip are conductively connected to the DC bus, one end of the telescopic rod is connected to the first handle of the spring clip, and one end of the telescopic rod is connected to the second handle of the spring clip, and the telescopic rod is configured to, when extended, expand the distance between the end of the first handle and the end of the second handle so that the jaws clamp the DC bus, and the lead-out wire is conductively connected to the spring clip.

[0030] The present application provides a substation mobile battery group access device, which includes an access control module, a voltage acquisition module, a load module and a controller. The access control module includes a switch device, the voltage acquisition module includes a first voltage acquisition circuit, the load module includes a load and a load current acquisition circuit, and the controller is electrically connected to the switch device, the first voltage acquisition circuit, the load and the load current acquisition circuit, respectively. The present application electrically connects the mobile battery group to the substation DC system through the switch device, and then respectively collects the voltage information output by the mobile battery group and the current of the load through the voltage acquisition module and the load module. The controller receives the first data signal transmitted by the voltage acquisition module and the second data signal transmitted by the load module to obtain the internal resistance of the mobile battery group. When the internal resistance of the mobile battery group is greater than or equal to the preset internal resistance threshold, the controller controls the switch device to disconnect, and when the internal resistance is less than the preset internal resistance threshold, the controller controls the switch device to connect. Because when the internal resistance of the mobile battery group is greater than or equal to the preset internal resistance threshold, it indicates that the mobile battery group is unqualified, which means that the battery state of the mobile battery group is not good, and the charging and discharging performance is abnormal, that is, it proves that the mobile battery group cannot work normally and the battery does not meet the standards, so the controller controls the switch device to disconnect, so as to prevent the mobile battery group that cannot work normally from being connected to the substation DC system; when the internal resistance of the mobile battery group is less than the preset internal resistance threshold, it indicates that the mobile battery group is qualified, which means that the battery state of the mobile battery group is good, and the charging and discharging performance is normal, that is, it proves that the mobile battery group can work normally and the battery meets the standards, so the controller controls the switch device to connect, so that the mobile battery group that can work normally is connected to the substation DC system. The substation mobile battery group access device of the present application determines whether the mobile battery group is working normally by obtaining the internal resistance of the mobile battery group. When the mobile battery group can work normally, the mobile battery group is connected to the substation DC system. When the mobile battery group cannot work normally, the mobile battery group that cannot work normally is prevented from being connected to the substation DC system, thereby ensuring the normal operation of the substation DC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 A schematic diagram of the structure of a mobile battery pack access device for a substation provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a load module in a mobile battery group access device for a substation provided in an embodiment of the present application;

[0034] Figure 3A schematic diagram of the structure of a voltage acquisition module in a mobile battery group access device for a substation provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the structure of a current acquisition module in a mobile battery group access device for a substation provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of a first voltage acquisition circuit in a mobile battery pack access device for a substation provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of the structure of a first current acquisition circuit in a mobile battery pack access device for a substation provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of the structure of the connecting components in the mobile battery group access device for a substation provided in an embodiment of the present application Figure 1 ;

[0039] Figure 8 A schematic diagram of the structure of the connecting components in the mobile battery group access device for a substation provided in an embodiment of the present application Figure 2 .

[0040] Description of reference numerals:

[0041] 10-mobile battery pack, 20-substation DC system, 30-jaw, 40-first handle, 50-second handle, 60-battery pack, 100-access control module, 110-switch device, 120-current control unit, 200-voltage acquisition module, 210-first voltage acquisition circuit, 211-voltage dividing resistor, 212-filter circuit, 213-first analog-to-digital converter, 220-second voltage acquisition circuit, 300-load module, 310-load, 320-load current acquisition circuit, 400-controller, 5 00-current acquisition module, 510-first current acquisition circuit, 511-current sensor, 512-voltage divider circuit, 513-second-order filter circuit, 514-voltage regulation circuit, 515-second analog-to-digital converter, 520-second current acquisition circuit, 600-human-computer interaction module, 700-alarm device, 800-internal emergency power supply, 900-battery access module, 910-connecting component, 911-contact guide member, 912-locking assembly, 9121-mounting plate, 9122-abutment rod, 913-lead-out conductive member.

[0042] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0044] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] The substation DC system is the core component to ensure the safe and reliable operation of the power system. It provides power for relay protection devices, circuit breaker opening and closing operations, signal equipment, automatic devices, etc. The substation DC system is electrically connected to the substation DC system and the battery pack. The substation AC system and the battery pack respectively supply power to the substation DC system. When the AC power supply of the substation AC system is interrupted, the substation DC system is powered by the battery pack.

[0048] The battery pack is charged by a charging module. According to the power regulations, the battery pack needs to be maintained and capacity checked regularly. During the capacity check of the battery pack, the battery pack is disconnected from the substation DC system. At this time, the mobile battery pack needs to be connected to the substation DC system. At this time, the mobile battery pack supplies power to the substation DC system.

[0049] After the mobile battery pack is connected to the substation DC system, it is impossible to determine whether the mobile battery pack is working normally. If an abnormal mobile battery pack is connected to the substation DC system, the normal operation of the substation DC system will be affected.

[0050] In order to solve the technical problem that after the existing mobile battery pack is connected to the substation DC system, it is impossible to determine whether the mobile battery pack is working normally, the present application proposes a substation mobile battery pack access device, including an access control module, a voltage acquisition module, a load module and a controller, the access control module includes a switch device, the switch device is used to be electrically connected to the mobile battery pack and the substation DC system respectively; the voltage acquisition module includes a first voltage acquisition circuit, the first voltage acquisition circuit is used to be electrically connected to the mobile battery pack to collect voltage information output by the mobile battery pack and convert the voltage information into a first data signal; the load module includes A load and a load current acquisition circuit, the load is used to be electrically connected to the mobile battery pack, the load current acquisition circuit is electrically connected to the load to acquire the current of the load and convert the current into a second data signal; a controller is electrically connected to the switch device, the first voltage acquisition circuit, the load and the load current acquisition circuit, respectively, for turning the load on and off, and receiving the first data signal and the second data signal when the load is turned on, and obtaining the internal resistance of the mobile battery pack according to the first data signal and the second data signal, the controller controls the switch device to disconnect when the internal resistance is greater than or equal to a preset internal resistance threshold, and controls the switch device to connect when the internal resistance is less than the preset internal resistance threshold.

[0051] The present application electrically connects the mobile battery group to the DC system of the substation through a switching device, and then respectively collects the voltage information output by the mobile battery group and the current of the load through a voltage acquisition module and a load module. The controller receives a first data signal transmitted by the voltage acquisition module and a second data signal transmitted by the load module to obtain the internal resistance of the mobile battery group. When the internal resistance of the mobile battery group is greater than or equal to a preset internal resistance threshold, the controller controls the switching device to disconnect, and when the internal resistance is less than the preset internal resistance threshold, the controller controls the switching device to connect. Because when the internal resistance of the mobile battery group is greater than or equal to the preset internal resistance threshold, it indicates that the mobile battery group is unqualified, which means that the battery state of the mobile battery group is not good, and the charging and discharging performance is abnormal, that is, it proves that the mobile battery group cannot work normally and the battery does not meet the standards, so the controller controls the switch device to disconnect, so as to prevent the mobile battery group that cannot work normally from being connected to the substation DC system; when the internal resistance of the mobile battery group is less than the preset internal resistance threshold, it indicates that the mobile battery group is qualified, which means that the battery state of the mobile battery group is good, and the charging and discharging performance is normal, that is, it proves that the mobile battery group can work normally and the battery meets the standards, so the controller controls the switch device to connect, so that the mobile battery group that can work normally is connected to the substation DC system. The substation mobile battery group access device of the present application determines whether the mobile battery group is working normally by obtaining the internal resistance of the mobile battery group. When the mobile battery group can work normally, the mobile battery group is connected to the substation DC system. When the mobile battery group cannot work normally, the mobile battery group that cannot work normally is prevented from being connected to the substation DC system, thereby ensuring the normal operation of the substation DC system.

[0052] The following specific embodiments are combined with the accompanying drawings to describe the technical solution of the application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0053] Reference Figures 1 to 8 As shown, Figure 1 A schematic diagram of the structure of a mobile battery pack access device for a substation provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a load module in a mobile battery group access device for a substation provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a voltage acquisition module in a mobile battery group access device for a substation provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of a current acquisition module in a mobile battery group access device for a substation provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a first voltage acquisition circuit in a mobile battery pack access device for a substation provided in an embodiment of the present application; Figure 6A schematic diagram of the structure of a first current acquisition circuit in a mobile battery pack access device for a substation provided in an embodiment of the present application; Figure 7 A schematic diagram of the structure of the connecting components in the mobile battery group access device for a substation provided in an embodiment of the present application Figure 1 ; Figure 8 A schematic diagram of the structure of the connecting components in the mobile battery group access device for a substation provided in an embodiment of the present application Figure 2 .

[0054] In the embodiments of this application, refer to Figures 1 to 4 As shown, an embodiment of the present application provides a substation mobile battery group access device, including an access control module 100, a voltage acquisition module 200, a load module 300 and a controller 400.

[0055] The access control module 100 includes a switch device 110 , which is used to electrically connect the mobile battery group 10 and the substation DC system 20 .

[0056] The voltage acquisition module 200 includes a first voltage acquisition circuit 210 , which is used to be electrically connected to the mobile battery pack 10 to acquire voltage information output by the mobile battery pack 10 and convert the voltage information into a first data signal.

[0057] The load module 300 includes a load 310 and a load current acquisition circuit 320 . The load 310 is used to be electrically connected to the mobile battery pack 10 . The load current acquisition circuit 320 is electrically connected to the load 310 to collect the current of the load 310 and convert the current into a second data signal.

[0058] The controller 400 is electrically connected to the switch device 110, the first voltage acquisition circuit 210, the load 310 and the load current acquisition circuit 320, respectively. The controller 400 is used to turn the load 310 on and off, and obtain the internal resistance of the mobile battery pack 10 according to the first data signal and the second data signal. When the internal resistance is greater than or equal to a preset internal resistance threshold, the controller 400 controls the switch device 110 to disconnect, and when the internal resistance is less than the preset internal resistance threshold, the controller 400 controls the switch device 110 to connect.

[0059] In the substation mobile battery group access device of the embodiment of the present application, the switch device 110 can be a circuit breaker, etc. The mobile battery group 10 is connected to the DC bus of the substation DC system 20 through the circuit breaker. When the circuit breaker is connected, the mobile battery group 10 is electrically connected to the substation DC system 20, so that the mobile battery group 10 is connected to the substation DC system 20, but when the circuit breaker is disconnected, the mobile battery group 10 is disconnected from the substation DC system 20.

[0060] The controller 400 may be a single chip microcomputer or the like.

[0061] The controller 400 controls the on and off of the load 310. When the controller 400 turns on the load 310, the load 310 discharges the mobile battery pack 10. The discharge time can be 1 second. Then the controller 400 turns off the load 310. During this period, the first voltage acquisition circuit 210 acquires the voltage information output by the mobile battery pack 10 and converts the voltage information into a first data signal; the load current acquisition circuit 320 acquires the current of the load 310 and converts the current into a second data signal. At this time, the controller 400 obtains the internal resistance of the mobile battery pack 10 according to the first data signal and the second data signal. The internal resistance is equal to the ratio of voltage to current, that is, the internal resistance of the mobile battery pack 10 is equal to the ratio of the voltage value in the first data signal to the flow value in the second data signal. After the controller 400 obtains the internal resistance of the mobile battery pack 10, it compares it with the preset internal resistance preset by the user. The mobile battery pack 10 is compared with the preset internal resistance threshold. When the internal resistance of the mobile battery pack 10 is greater than or equal to the preset internal resistance threshold, it indicates that the mobile battery pack 10 is unqualified, which means that the battery state of the mobile battery pack 10 is not good, and the charging and discharging performance is abnormal, which means that the mobile battery pack 10 cannot work normally and the battery does not meet the standard. Therefore, the controller 400 controls the switch device 110 to disconnect, so as to prevent the mobile battery pack 10 that cannot work normally from being connected to the substation DC system 20; when the internal resistance of the mobile battery pack 10 is less than the preset internal resistance threshold, it indicates that the mobile battery pack 10 is qualified, which means that the battery state of the mobile battery pack 10 is good, and the charging and discharging performance is normal, which means that the mobile battery pack 10 can work normally and the battery meets the standard. Therefore, the controller 400 controls the switch device 110 to connect, so that the mobile battery pack 10 that can work normally is connected to the substation DC system 20.

[0062] The substation mobile battery group access device of the present application determines whether the mobile battery group can work normally by obtaining the internal resistance of the mobile battery group 10. When the mobile battery group can work normally, the mobile battery group 10 is connected to the substation DC system 20. When the mobile battery group cannot work normally, the mobile battery group 10 that cannot work normally is prevented from being connected to the substation DC system 20, thereby ensuring the normal operation of the substation DC system 20.

[0063] In other embodiments, a current acquisition module 500 and a human-computer interaction module 600 are further included. The current acquisition module 500 includes a first current acquisition circuit 510 electrically connected to the controller 400 , and the human-computer interaction module 600 is electrically connected to the controller 400 .

[0064] The first current acquisition circuit 510 is used to be electrically connected to the mobile battery pack 10 to collect current information of the mobile battery pack 10 and convert the current information of the mobile battery pack 10 into a third data signal to transmit to the controller 400 . The controller 400 controls the human-computer interaction module 600 to display the current information of the mobile battery pack 10 .

[0065] In this embodiment, the human-computer interaction module 600 can be an input panel, such as a touch screen, which can display information for the user to view. The first current acquisition circuit 510 acquires the current information of the mobile battery pack 10, and converts the current information of the mobile battery pack 10 into a third data signal and transmits it to the controller 400. The controller 400 controls the human-computer interaction module 600 to display the current information of the mobile battery pack 10, so that the user can view the current information of the mobile battery pack 10 on the human-computer interaction module 600, and the user can view the positive and negative current in the current information.

[0066] When the current is positive, it proves that the current flows into the mobile battery pack 10, which means that the charging module in the substation DC system 20 is charging the mobile battery pack 10. At this time, it proves that the mobile battery pack 10 does not supply power to the substation DC system 20.

[0067] When the current is negative, it indicates that the current flows out of the mobile battery pack 10 , which means that the mobile battery pack 10 is supplying power to the substation DC system 20 .

[0068] In this embodiment, the user can view the current information of the mobile battery pack 10 obtained through the human-computer interaction module 600, and determine whether the mobile battery pack 10 is supplying power to the substation DC system 20 based on the positive and negative current in the current information, and obtain the current operating status of the mobile battery pack 10.

[0069] In one embodiment, the access control module 100 further includes a current control unit 120 electrically connected to the controller 400 . The current control unit 120 is used to be electrically connected to the mobile battery pack 10 to control the charging and discharging current of the mobile battery pack 10 .

[0070] The controller 400 controls the current control unit 120 based on the predetermined current value preset by the human-machine interaction module 600, so that the charging and discharging current of the mobile storage battery pack 10 is the same as the predetermined current value.

[0071] In this embodiment, the current control unit 120 controls the charge and discharge current of the mobile battery pack 10 so that the charge and discharge current of the mobile battery pack 10 is a predetermined current value, thereby ensuring that the charge and discharge current of the mobile battery pack 10 is within a reasonable range.

[0072] In some embodiments, the current acquisition module 500 also includes a second current acquisition circuit 520 electrically connected to the controller 400. The second current acquisition circuit 520 is used to electrically connect to the battery pack 60 of the substation DC system 20 to collect current information of the battery pack 60, and convert the current information of the battery pack 60 into a fourth data signal and transmit it to the controller 400. The controller 400 controls the current control unit 120 based on the third data signal and the fourth data signal so that the charging and discharging current of the mobile battery pack 10 is the same as the charging and discharging current of the battery pack 60.

[0073] In this embodiment, when the battery group 60 and the mobile battery group 10 of the substation DC system 20 are both connected to the substation DC system 20, in order to ensure that the charging module of the substation DC system 20 charges the battery group 60 and the mobile battery group 10, their charging currents are consistent, so that the current information of the battery group 60 is collected through the second current collection circuit 520, and then the charging current of the mobile battery group 10 is controlled through the current control unit 120, so that the charging current of the mobile battery group 10 is the same as the charging current of the battery group 60.

[0074] Similarly, when the battery pack 60 and the mobile battery pack 10 of the substation DC system 20 are both connected to the substation DC system 20, in order to ensure that the battery pack 60 and the mobile battery pack 10 have the same power supply current when supplying power to the substation DC system 20, the current information of the battery pack 60 is collected through the second current collection circuit 520, and then the power supply current of the mobile battery pack 10 is controlled through the current control unit 120, so that the power supply current of the mobile battery pack 10 is the same as the power supply current of the battery pack 60.

[0075] In some possible embodiments, reference Figure 5 As shown, the first voltage acquisition circuit 210 includes a voltage-dividing resistor 211, a filtering circuit 212 and a first analog-to-digital converter 213 which are electrically connected in sequence; the voltage-dividing resistor 211 is used to be electrically connected to the mobile battery pack 10, and the voltage-dividing resistor 211 is used to convert the voltage information output by the mobile battery pack 10 into low voltage information; the filtering circuit 212 is used to filter the low voltage information; the first analog-to-digital converter 213 is used to convert the filtered low voltage information into a first data signal, and transmit the first data signal to the controller 400.

[0076] In this embodiment, after the mobile battery pack 10 is connected to the access control module 100, the voltage of the mobile battery pack 10 first passes through the voltage divider resistor 211 to convert the high voltage into a low voltage that can be recognized by the chip. The low voltage needs to be filtered by the filter circuit 212 to filter out the interference of the power frequency and some noise, and then reaches the analog-to-digital converter to convert the voltage into a first data signal that can be recognized by the controller 400. The controller 400 can then process the first data signal, and finally display the acquired voltage information through the human-computer interaction module 600.

[0077] Furthermore, the voltage acquisition module 200 also includes a second voltage acquisition circuit 220 , which can acquire voltage information of a DC system or voltage information of a battery pack. The structure of the second voltage acquisition circuit 220 can be the same as that of the first voltage acquisition circuit 210 .

[0078] In one possible embodiment, referring to Figure 6 As shown, the first current acquisition circuit 510 includes a current sensor 511, a voltage divider circuit 512, a second-order filter circuit 513, a voltage regulation circuit 514 and a second analog-to-digital converter 515 which are electrically connected in sequence; the current sensor 511 is used to be electrically connected to the mobile battery pack 10, and the current sensor 511 is used to convert the current information of the mobile battery pack 10 into an analog signal; the voltage divider circuit 512 is used to reduce the voltage of the analog signal to obtain a low-voltage analog signal; the second-order filter circuit 513 is used to filter the low-voltage analog signal; the voltage regulation circuit 514 is used to raise the low-voltage analog signal after filtering; the second analog-to-digital converter 515 is used to convert the raised low-voltage analog signal into a third data signal, and transmit the third data signal to the controller 400.

[0079] In this embodiment, the current sensor 511 can be a Hall current sensor 511, and the current acquisition module 500 includes the Hall current sensor 511 and an analog signal processing unit. The analog signal processing unit includes a voltage divider circuit 512, a second-order filtering circuit 513, a voltage regulating circuit 514, and a second analog-to-digital converter 515. The Hall current sensor 511 mainly converts the collected current value into an analog signal and transmits it to the analog signal processing unit. In the analog signal processing unit, since the current value has positive and negative values, the analog voltage output by the Hall current sensor 511 also has positive and negative values. We need to convert the negative voltage into a positive voltage that the chip can recognize. In the analog signal processing unit, it first passes through a voltage divider circuit 512 to reduce the voltage, and then uses a second-order filter to filter out interference. It passes through a voltage regulating circuit 514 to convert the negative voltage into a positive voltage, and then outputs it to the second analog-to-digital converter 515 for conversion, and converts it into a digital signal that the controller 400 can recognize for processing and calculation.

[0080] Specifically, the voltage regulating circuit 514 is a voltage boosting circuit. When the Hall current sensor 511 detects that the current is negative, the output signal voltage is a negative value. Since the analog-to-digital conversion can only convert positive voltages, this circuit is required. In this circuit, a 2.5V voltage is used as a reference voltage (i.e., the zero point). When the output of the Hall current sensor 511 is negative, the voltage given to the analog-to-digital conversion after the voltage is boosted is a positive voltage. When the voltage is positive, the voltage reaching the analog-to-digital conversion after passing through this circuit will be higher. In short, the voltage reaching the analog-to-digital conversion is the sum of the output voltage of the Hall current sensor 511 and the 2.5V voltage.

[0081] In another possible embodiment, it also includes an alarm device 700 and an internal emergency power supply 800. The internal emergency power supply 800 is used to be electrically connected to the substation DC system 20. The alarm device 700 and the internal emergency power supply 800 are both electrically connected to the controller 400. When the first data signal is less than a predetermined voltage value preset by the human-computer interaction module 600, the controller 400 controls the alarm device 700 to issue an alarm and controls the internal emergency power supply 800 to start, so that the internal emergency power supply 800 supplies power to the substation DC system 20.

[0082] In this embodiment, when the voltage value of the voltage information output by the mobile battery pack 10 detected by the first voltage acquisition circuit 210 is less than the predetermined voltage value preset by the user, the controller 400 controls the alarm device 700 to sound an alarm and control the internal emergency power supply 800 to start. While notifying the user, the internal emergency power supply 800 supplies power to the substation DC system 20 to ensure the normal operation of the substation DC system 20.

[0083] In certain embodiments, reference Figure 7 and Figure 8As shown, it also includes a battery access module 900, which includes a wiring terminal and a connecting component 910. One end of the switch device 110 is electrically connected to the mobile battery pack 10, and the other end of the switch device 110 is electrically connected to the wiring terminal. The connecting component 910 includes a contact guide 911, a locking assembly 912 and a lead-out conductive member 913. One end of the lead-out conductive member 913 is electrically connected to the wiring terminal, and the other end of the lead-out conductive member 913 is conductively connected to the contact guide 911. The contact guide 911 is used to be conductively connected to the DC bus of the substation DC system 20. The locking assembly 912 is arranged on the contact guide 911 to lock the DC bus on the contact guide 911.

[0084] In this embodiment, the mobile battery pack 10 is conductively connected to the terminal block through the switch device 110, and the terminal block is conductively connected to the DC bus of the substation DC system 20 through the connecting component 910, wherein the connecting component 910 includes a contact guide 911, a locking assembly 912 and a lead-out conductive member 913, and the DC bus is locked on the contact guide 911 through the locking assembly 912, thereby ensuring that the mobile battery pack 10 can be stably conductively connected to the substation DC system 20, preventing the mobile battery pack 10 from being separated from the substation DC system 20, and allowing the substation DC system 20 to operate stably.

[0085] In other possible embodiments, refer to Figure 7 As shown, the contact guide 911 is a conductive plate, the locking assembly 912 includes a mounting plate 9121 and an abutment rod 9122, the lead-out conductive member 913 is a lead-out wire, one side of the conductive plate is used for conductive connection with the DC bus, the mounting plate 9121 is fixed on the conductive plate, and a mounting gap is formed between the mounting plate 9121 and the conductive plate, the mounting gap is used for installing the DC bus, the abutment rod 9122 is arranged on the mounting plate 9121, the abutment rod 9122 is used to abut against the DC bus, so that the DC bus abuts between the conductive plate and the abutment rod 9122, and the lead-out wire is conductively connected to the conductive plate.

[0086] In this embodiment, the DC bus is abutted between the conductive plate and the abutting rod 9122 by the abutting rod 9122 , so that the DC bus connection is more firm and stable.

[0087] Specifically, a threaded hole is provided on the mounting plate 9121, and the abutment rod 9122 is a threaded rod, on which an abutment plate is provided. By screwing the threaded rod in the threaded hole, the abutment plate is driven to move toward the DC bus until the abutment plate abuts against the DC bus, thereby making the DC bus abut between the conductive plate and the abutment plate.

[0088] Furthermore, the side of the conductive plate facing the DC busbar is a concave-convex surface, and the friction between the conductive plate and the DC busbar is increased by providing the concave-convex surface, thereby further ensuring the stability of the DC busbar fixation.

[0089] In some possible embodiments, reference Figure 8 As shown, the contact guide 911 includes a spring clip, the locking assembly 912 is a telescopic rod, the lead-out conductive member 913 is a lead-out wire, the jaws 30 of the spring clip are conductively connected to the DC bus, one end of the telescopic rod is connected to the first handle 40 of the spring clip, and one end of the telescopic rod is connected to the second handle 50 of the spring clip. The telescopic rod is configured to, when extended, expand the distance between the end of the first handle 40 and the end of the second handle 50 so that the jaws 30 clamp the DC bus, and the lead-out wire is conductively connected to the spring clip.

[0090] In this embodiment, by extending the telescopic rod, the distance between the end of the first handle 40 and the end of the second handle 50 is enlarged, so that the jaws 30 are further clamped and the jaws 30 can be prevented from loosening, thereby ensuring that the DC bus can be stably clamped in the jaws 30.

[0091] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0092] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A mobile battery access device for a substation, characterized in that: include: An access control module (100) comprises a switch device (110), wherein the switch device (110) is used to electrically connect a mobile storage battery pack (10) and a substation DC system (20); A voltage acquisition module (200) comprises a first voltage acquisition circuit (210), wherein the first voltage acquisition circuit (210) is used to be electrically connected to the mobile storage battery pack (10) to acquire voltage information output by the mobile storage battery pack (10) and convert the voltage information into a first data signal; A load module (300) comprising a load (310) and a load current acquisition circuit (320), wherein the load (310) is used to be electrically connected to the mobile storage battery pack (10), and the load current acquisition circuit (320) is electrically connected to the load (310) to acquire the current of the load (310) and convert the current into a second data signal; A controller (400) is electrically connected to the switch device (110), the first voltage acquisition circuit (210), the load (310), and the load current acquisition circuit (320), respectively; the controller (400) is used to turn on and off the load (310), and to obtain the internal resistance of the mobile storage battery pack (10) according to the first data signal and the second data signal; when the internal resistance is greater than or equal to a preset internal resistance threshold, the controller (400) controls the switch device (110) to be disconnected; when the internal resistance is less than the preset internal resistance threshold, the controller (400) controls the switch device (110) to be connected.

2. The substation mobile battery group access device according to claim 1, characterized in that: It also includes a current acquisition module (500) and a human-computer interaction module (600), wherein the current acquisition module (500) includes a first current acquisition circuit (510) electrically connected to the controller (400), and the human-computer interaction module (600) is electrically connected to the controller (400); The first current acquisition circuit (510) is used to be electrically connected to the mobile battery pack (10) to acquire current information of the mobile battery pack (10), and to convert the current information of the mobile battery pack (10) into a third data signal for transmission to the controller (400); the controller (400) controls the human-computer interaction module (600) to display the current information of the mobile battery pack (10).

3. The mobile battery group access device for substation according to claim 2, characterized in that: The access control module (100) further comprises a current control unit (120) electrically connected to the controller (400), wherein the current control unit (120) is used to electrically connect to the mobile storage battery pack (10) to control the charging and discharging current of the mobile storage battery pack (10); The controller (400) controls the current control unit (120) based on a predetermined current value preset by the human-machine interaction module (600), so that the charging and discharging current of the mobile storage battery pack (10) is the same as the predetermined current value.

4. The mobile battery group access device for substation according to claim 3, characterized in that: The current acquisition module (500) further comprises a second current acquisition circuit (520) electrically connected to the controller (400); the second current acquisition circuit (520) is used to electrically connect to a battery pack (60) of the substation DC system (20) to acquire current information of the battery pack (60), and convert the current information of the battery pack (60) into a fourth data signal for transmission to the controller (400); the controller (400) controls the current control unit (120) based on the third data signal and the fourth data signal, so that the charge and discharge current of the mobile battery pack (10) is the same as the charge and discharge current of the battery pack (60).

5. The mobile battery group access device for substation according to claim 1, characterized in that: The first voltage acquisition circuit (210) comprises a voltage dividing resistor (211), a filter circuit (212) and a first analog-to-digital converter (213) which are electrically connected in sequence; The voltage dividing resistor (211) is used to be electrically connected to the mobile storage battery pack (10), and the voltage dividing resistor (211) is used to convert the voltage information output by the mobile storage battery pack (10) into low voltage information; The filtering circuit (212) is used to filter the low voltage information; The first analog-to-digital converter (213) is used to convert the low voltage information that has been filtered into the first data signal, and transmit the first data signal to the controller (400).

6. The mobile battery group access device for substation according to claim 2, characterized in that: The first current acquisition circuit (510) comprises a current sensor (511), a voltage divider circuit (512), a second-order filter circuit (513), a voltage regulation circuit (514), and a second analog-to-digital converter (515) which are electrically connected in sequence; The current sensor (511) is used to be electrically connected to the mobile storage battery pack (10), and the current sensor (511) is used to convert current information of the mobile storage battery pack (10) into an analog signal; The voltage divider circuit (512) is used to reduce the voltage of the analog signal to obtain a low-voltage analog signal; The second-order filter circuit (513) is used to filter the low-voltage analog signal; The voltage regulating circuit (514) is used to raise the low voltage analog signal after filtering; The second analog-to-digital converter (515) is used to convert the boosted low voltage analog signal into the third data signal, and transmit the third data signal to the controller (400).

7. The substation mobile battery group access device according to claim 2, characterized in that: The invention also comprises an alarm device (700) and an internal emergency power supply (800), wherein the internal emergency power supply (800) is used to be electrically connected to the substation DC system (20), and the alarm device (700) and the internal emergency power supply (800) are both electrically connected to the controller (400). When the first data signal is less than a predetermined voltage value preset by the human-computer interaction module (600), the controller (400) controls the alarm device (700) to issue an alarm and controls the internal emergency power supply (800) to start, so that the internal emergency power supply (800) supplies power to the substation DC system (20).

8. The mobile battery group access device for a substation according to any one of claims 1 to 7, characterized in that: The invention also comprises a battery access module (900), wherein the battery access module (900) comprises a connection terminal and a connecting component (910), wherein one end of the switch device (110) is electrically connected to the mobile battery pack (10), and the other end of the switch device (110) is electrically connected to the connection terminal, and the connecting component (910) comprises a contact guide (911), a locking assembly (912) and a lead-out conductive member (913), wherein one end of the lead-out conductive member (913) is electrically connected to the connection terminal, and the other end of the lead-out conductive member (913) is electrically connected to the contact guide (911), and the contact guide (911) is used for electrically connecting to a DC busbar of the DC system (20) of the transformer substation, and the locking assembly (912) is arranged on the contact guide (911) to lock the DC busbar on the contact guide (911).

9. The mobile battery group access device for substation according to claim 8, characterized in that: The contact guide member (911) is a conductive plate, the locking assembly (912) includes a mounting plate (9121) and an abutment rod (9122), the lead-out conductive member (913) is a lead-out wire, one side of the conductive plate is used for conductive connection with the DC bus, the mounting plate (9121) is fixed on the conductive plate, and a mounting gap is formed between the mounting plate (9121) and the conductive plate, the mounting gap is used for mounting the DC bus, the abutment rod (9122) is arranged on the mounting plate (9121), the abutment rod (9122) is used for abutting with the DC bus, so that the DC bus abuts between the conductive plate and the abutment rod (9122), and the lead-out wire is conductively connected with the conductive plate.

10. The mobile battery group access device for substation according to claim 8, characterized in that: The contact guide (911) comprises a spring clip, the locking assembly (912) is a telescopic rod, the lead-out conductive member (913) is a lead-out wire, the jaws (30) of the spring clip are electrically connected to the DC bus, one end of the telescopic rod is connected to the first handle (40) of the spring clip, and one end of the telescopic rod is connected to the second handle (50) of the spring clip, and the telescopic rod is configured to, when extended, expand the distance between the end of the first handle (40) and the end of the second handle (50), so that the jaws (30) clamp the DC bus, and the lead-out wire is electrically connected to the spring clip.

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