Device for preventing misunderstanding of protection state and energy storage system

Abstract

The utility model discloses a device for preventing misunderstanding of a protection state and an energy storage system. The device comprises a first switch module, a reset control module and a relay, the relay is connected with the first switch module and the reset control module. The first switch module is connected with the input end of the relay, the reset control module is connected with the reset control end of the relay, and the output end of the relay is connected with the first switch module; the reset control module is used for transmitting a reset control signal to the relay in a closed state; and the relay is used for controlling the internal switch unit to be closed according to the reset control signal after the first switch module is changed from the open state to the closed state so as to conduct the circuit where the first switch module is located again. When the first switch module is controlled to be changed into the closed state from the open state and the reset control module is controlled to be in the closed state, the circuit where the first switch module is located is switched on again, the circuit is switched on again under the dual conditions, and the safety of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a protection state misunderstanding removal device and an energy storage system. Background Art

[0002] In the energy storage device, when the emergency stop button of the AC side device or the DC side device is pressed, the main circuit switch of the device is disconnected through the electrical control circuit, and the emergency stop signal is transmitted to the other side control device through communication, and the other side control device performs the shutdown operation on the AC side device or the DC side device. For example: When the emergency stop button of DC side A is pressed, the main circuit breaker of DC side A is disconnected, and the DC side A control device transmits the emergency stop information to the AC side control device through communication. After receiving the information, the AC side control device performs the shutdown operation on this side.

[0003] Therefore the prior art still needs to be improved and enhanced. Utility Model Content

[0004] The main purpose of the utility model is to provide a device for preventing the protection state from being misinterpreted and an energy storage system, aiming to solve the problems of low safety and high control cost in the prior art when the AC side equipment or the DC side equipment in the energy storage device is shut down.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a device for removing a protection state error, comprising: a first switch module, a reset control module and a relay;

[0007] The relay is connected to the first switch module and the reset control module respectively; the first switch module is connected to the input end of the relay, and the reset control module is connected to the reset control end of the relay;

[0008] The reset control module is used to transmit a reset control signal to the relay when it is in a closed state; the relay is used to control its internal switch unit to close according to the reset control signal after the first switch module changes from an open state to a closed state, so as to reopen the circuit where the first switch module is located.

[0009] In some embodiments, the first switch module is used to transmit a first switch control signal to the relay when in an off state; the relay is also used to control its internal switch unit to be off according to the first switch control signal to disconnect the circuit where the first switch module is located.

[0010] In some embodiments, when the first switch module changes from an open state to a closed state and the reset control module is in a closed state, the relay is used to control the internal switch unit to close according to the received reset control signal to reopen the circuit where the first switch module is located.

[0011] In some embodiments, it also includes: a second switch module; the second switch module is connected in series between the output end of the relay and the first switch module; the second switch module is used to change the opening and closing state of the second switch module according to the opening and closing state of the internal switch unit to control the conduction or disconnection of the circuit.

[0012] In some embodiments, it also includes: a power module; the power module is connected to the power input terminal of the relay; the power module is used to provide power supply to the relay.

[0013] In some embodiments, it also includes: a switch state detection module; the switch state detection module is connected to the relay, and the switch state detection module is used to detect the opening and closing state of the internal switch unit.

[0014] In some embodiments, the first switch module is disposed on a DC side device or an AC side device, and is used to control whether the DC side device or the AC side device is connected to a circuit.

[0015] In some embodiments, the first switch module includes: N*M first self-locking switches; after each N first self-locking switches are connected in series, they are respectively connected in series to the M input circuits of the relay.

[0016] In some embodiments, the reset control module includes: a second self-locking switch; the second self-locking switch is connected in series to the safety chain reset loop of the relay.

[0017] In a second aspect, an embodiment of the present application provides an energy storage system, on which the above-mentioned device for preventing the protection state from being misunderstood is provided.

[0018] Compared with the prior art, the utility model provides a protection state misinterpretation elimination device and an energy storage system, the device comprising: a first switch module, a reset control module and a relay; the relay is connected to the first switch module and the reset control module respectively; the first switch module is connected to the input end of the relay, the reset control module is connected to the reset control end of the relay, and the output end of the relay is used to connect the first switch module; the reset control module is used to transmit a reset control signal to the relay when it is in a closed state; the relay is used to control its internal switch unit to close according to the reset control signal after the first switch module changes from an open state to a closed state, so as to reopen the circuit where the first switch module is located.

[0019] In the present application, after the circuit where the first switch module is located is disconnected, the first switch module is controlled to change from an open state to a closed state, and the reset control module is controlled to be in a closed state, so that the relay controls its internal switch unit to close according to the reset control signal generated by the reset control module to re-conduct the circuit where the first switch module is located, thereby realizing the re-conduction of the circuit under dual conditions, that is, realizing dual protection for releasing the emergency shutdown state, and effectively improving the safety of the energy storage system. In addition, the device cost used is low and no separate control device is required, thereby effectively saving the control cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A structural block diagram of a preferred embodiment of the device for removing the protection state misunderstanding provided by the utility model;

[0022] Figure 2 A simplified structural diagram of the energy storage system provided by the utility model;

[0023] Figure 3 The present invention is a schematic diagram of the circuit structure of a preferred embodiment of the device for removing the protection state misunderstanding provided by the present invention.

[0024] Figure numerals: 10: first switch module; 20: reset control module; 30: relay; 31: internal switch unit; 40: second switch module; 50: power supply module; 60: switch state detection module; K1: first self-locking switch; K2: second self-locking switch; K3: third self-locking switch; K4: fourth self-locking switch; K5: fifth self-locking switch; K6: sixth self-locking switch; K7: seventh self-locking switch; K8: eighth self-locking switch. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0026] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0027] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0029] The utility model provides a device and energy storage system for preventing the protection state from being misinterpreted. In the present application, after the circuit where the first switch module is located is disconnected, the first switch module is controlled to change from an open state to a closed state, and the reset control module is controlled to be in a closed state, so that the relay controls its internal switch unit to close according to the reset control signal generated by the reset control module to reopen the circuit where the first switch module is located, thereby realizing the circuit being reopened under dual conditions, that is, realizing dual protection for releasing the emergency shutdown state, and effectively improving the safety of the energy storage system. In addition, the adopted device cost is low and does not require a separate control device, thereby effectively saving the control cost.

[0030] The following describes the design scheme of the device for removing the protection state misunderstanding through specific exemplary embodiments. It should be noted that the following embodiments are only used to explain the technical scheme of the utility model and are not specifically limited:

[0031] See also Figure 1The first embodiment of the present application provides a device for removing the protection state misunderstanding, including: a first switch module 10, a reset control module 20 and a relay 30; the relay 30 is connected to the first switch module 10 and the reset control module 20 respectively; the first switch module 10 is connected to the input end of the relay 30, the reset control module 20 is connected to the reset control end of the relay 30, and the output end of the relay 30 is used to connect the first switch module 10.

[0032] The reset control module 20 is used to transmit a reset control signal to the relay 30 when it is in a closed state; the relay 30 is used to control its internal switch unit 31 to close according to the reset control signal after the first switch module 10 changes from an open state to a closed state, so as to reopen the circuit where the first switch module 10 is located.

[0033] Also see Figure 2 The device for preventing the protection state from being misunderstood is arranged on the energy storage system, and the energy storage system generally includes an AC side device and a DC side device. In this embodiment, the DC side device includes: a DC side A and a DC side B.

[0034] The output end of the relay 30 is connected to the AC side device and the DC side device, and the AC side device and the DC side device are both provided with a first switch module 10 , so the output end of the relay 30 is also connected to the first switch module 10 .

[0035] Specifically, the process of preventing the emergency shutdown from being mistakenly removed by the protection state mis-removal device is as follows:

[0036] When the energy storage system is in an emergency shutdown state, the first switch module 10 is in an off state, and the internal switch unit 31 in the relay 30 is in an off state, so that the circuit where the first switch module 10 is located is disconnected.

[0037] Then, when the energy storage system needs to release the emergency shutdown state, the reset control module 20 is in a closed state through computer or manual control. At this time, the reset control module 20 transmits the reset control signal to the relay 30. At the same time, the operator is required to reset the first switch module 10 so that the first switch module 10 changes from an open state to a closed state.

[0038] Then, the relay 30 controls its internal switch unit 31 to close according to the reset control signal, so as to reopen the circuit where the first switch module 10 is located.

[0039] In the present application, when an emergency shutdown occurs in the energy storage system, that is, after the circuit where the first switch module 10 is located is disconnected, the first switch module 10 is controlled to be in a closed state and the reset control module 20 is controlled to be in a closed state, thereby restoring the circuit conduction under double insurance conditions, effectively avoiding the emergency shutdown state from being mistakenly canceled, thereby protecting the safety of the equipment in the energy storage system and improving the safety of the energy storage system.

[0040] Furthermore, the first switch module 10 is arranged on a DC side device or an AC side device, and is used to control whether the DC side device or the AC side device is connected to a circuit.

[0041] Among them, in the present application, the DC side equipment and the AC side equipment realize AC-DC side linkage, and the AC-DC side linkage ensures the complete isolation of the electrical circuit in an emergency.

[0042] Specifically, the DC side is the battery compartment, including batteries, temperature control, fire protection, junction boxes, containers and other equipment; the AC side is the electrical compartment, including energy storage converters, transformers, containers, etc. Among them, the DC side is installed with DC part equipment for energy storage, mainly energy storage batteries and circuit breakers and control equipment on the main circuit. The equipment installed on the AC side is energy storage converters and step-up transformers as well as AC and DC circuit breakers.

[0043] In addition, the installation type of the DC side includes installing the equipment in a container, which is called a box type, and installing the equipment in an outdoor cabinet, which is called a cabinet type. However, an emergency stop button (first switch module 10) is provided on both the AC side equipment and the DC side equipment. The emergency stop button is generally installed on the outer panel of the box type or cabinet type. In an emergency, the button can be manually pressed to realize the emergency shutdown of the energy storage system.

[0044] Furthermore, the first switch module 10 is used to transmit a first switch control signal to the relay 30 when in an off state; the relay 30 is also used to control its internal switch unit 31 to be off according to the first switch control signal to disconnect the circuit where the first switch module 10 is located.

[0045] Specifically, first, when the energy storage system works normally, at this time, the first switch module 10 is in a closed state, the reset control module 20 is in an open state, and the internal switch unit 31 in the relay 30 is in a closed state.

[0046] However, when the energy storage system fails and needs emergency shutdown, the operator presses the first switch module 10 to put the first switch module 10 in an off state, and the first switch module 10 transmits the first switch control signal to the relay 30. Then, the relay 30 controls its internal switch unit 31 to be off according to the first switch control signal.

[0047] In the present application, the first switch module 10 is controlled to be in an off state, so that the internal switch unit 31 of the relay 30 is automatically disconnected to disconnect the circuit, thereby disconnecting the AC side device and the DC side device from the circuit by controlling the first switch module 10, thereby achieving emergency shutdown when the energy storage system fails, effectively protecting the safety of the energy storage system and reducing the losses caused by device damage.

[0048] Furthermore, when the first switch module 10 changes from an open state to a closed state and the reset control module 20 is in a closed state, the relay 30 is used to control the internal switch unit 31 to close according to the received reset control signal to reopen the circuit where the first switch module 10 is located.

[0049] Specifically, when the energy storage system is in an emergency shutdown state, at this time, the first switch module 10 is in a disconnected state, and the circuit where the first switch module 10 is located is in a disconnected state.

[0050] When the emergency shutdown state needs to be released, the first switch module 10 needs to be controlled manually or by computer to be in a closed state. However, only after the reset control module 20 is controlled to be in a closed state, the reset control module 20 will transmit the reset control signal to the relay 30. Then, the relay 30 will control the internal switch unit 31 to be closed according to the received reset control signal, so as to re-open the circuit where the first switch module 10 is located, thereby truly releasing the emergency shutdown state.

[0051] That is, a dual protection mechanism of the reset control module 20 being in a closed state and the reset control module 20 being in a closed state is formed, thereby avoiding the problem of the circuit being reconnected due to the emergency stop button being reclosed before the energy storage system returns to normal due to accidental touching, thereby causing damage to the ground device.

[0052] For further information, see Figure 3 The first switch module 10 includes: N*M first self-locking switches K1; each N first self-locking switches K1 are connected in series and are respectively connected in series to the M input circuits of the relay 30.

[0053] Specifically, there are M input circuits on the relay 30, each of which has N first self-locking switches K1, i.e., emergency stop buttons. In this embodiment, there are 2 (M is 2) input circuits on the relay 30 (corresponding to Figure 3Take the middle loop S11-S12 and loop S21-S22), each input loop is connected in series with 3 (N is 3) first self-locking switches K1 as an example: that is, each input loop is connected in series with 2 DC side devices (DC side A and DC side B) and 1 AC side device, and each DC side device or each AC side device is provided with a first self-locking switch K1.

[0054] Furthermore, the reset control module 20 includes: a second self-locking switch K2 ; the second self-locking switch K2 is connected in series to the safety chain reset circuit of the relay 30 .

[0055] Specifically, the second self-locking switch K2 is connected in series with the safety chain reset circuit of the relay 30 (corresponding to Figure 3 The safety chain return circuit prevents the emergency stop button from being pulled out by mistake, resulting in the emergency stop circuit returning by mistake.

[0056] Furthermore, the relay 30 includes: N internal switch units 31 ; each of the internal switch units 31 is connected to the second switch module 40 .

[0057] Specifically, each internal switch unit 31 includes a total of M third self-locking switches K3 and fourth self-locking switches K4 (corresponding to the number of input circuits), and all third self-locking switches K3 and all fourth self-locking switches K4 are synchronous switches. Figure 3 The opening and closing state of the middle circuit S11-S12) controls the opening and closing state of all third self-locking switches K3, which are controlled by the second input circuit (corresponding to Figure 3 The opening and closing state of the middle loop S21-S22 controls the opening and closing state of all fourth self-locking switches K4, that is, when the first input loop is disconnected, all third self-locking switches K3 are disconnected. Similarly, when the second input loop is disconnected, all fourth self-locking switches K4 are disconnected.

[0058] Furthermore, in the second embodiment of the present application, the device for preventing the protection state from being misinterpreted also includes: a second switch module 40; the second switch module 40 is connected in series between the output end of the relay 30 and the first switch module 10; the second switch module 40 is used to change the opening and closing state of the second switch module 40 according to the opening and closing state of the internal switch unit 31 to control the conduction or disconnection of the circuit.

[0059] Among them, the second switch module 40 includes N fifth self-locking switches K5, and the fifth self-locking switch K5 is a circuit breaker. One circuit breaker is connected in series with one internal switch unit 31 to form an emergency stop action circuit. Then, N circuit breakers are connected in series with N internal switch units 31 to form N emergency stop action circuits. For example, in the present application, three circuit breakers are connected in series with three internal switch units 31 to form three emergency stop action circuits.

[0060] In addition, the fifth self-locking switch K5 is connected in series with the circuit breaker of the main circuit of the energy storage system, and the circuit breaker is connected to the AC side equipment and the DC side equipment, so that the second switch module 40 is connected in series between the output end of the relay 30 and the first switch module 10.

[0061] Specifically, the switching state of the internal switch unit 31 in the relay 30 changes the opening and closing state of the second switch module 40: that is, the opening and closing state of the second switch module 40 changes with the switching state of the internal switch unit 31, thereby realizing the conduction or disconnection of the corresponding control circuit when the internal switch unit 31 is in a closed state or an open state.

[0062] Furthermore, the device for removing the protection state misunderstanding further includes: a power module 50 ; the power module 50 is connected to the power input terminal of the relay 30 ; the power module 50 is used to provide power supply to the relay 30 .

[0063] Specifically, the power module 50 includes: an input voltage interface and a sixth self-locking switch K6; the input voltage interface is used to access the input voltage (corresponding to Figure 3 DC24V power supply + and DC24V power supply -).

[0064] Furthermore, the protection state misunderstanding removal device further includes: a switch state detection module 60 ; the switch state detection module 60 is connected to the relay 30 , and the switch state detection module 60 is used to detect the opening and closing state of the internal switch unit 31 .

[0065] Specifically, the switch state detection module 60 includes: a seventh self-locking switch K7 and an eighth self-locking switch K8; the seventh self-locking switch K7 and the third self-locking switch K3 are synchronous switches, but the opening and closing state directions are different. Similarly, the eighth self-locking switch K8 and the fourth self-locking switch K4 are synchronous switches, but the opening and closing state directions are different.

[0066] In order to better understand the present invention, the following Figure 2-Figure 3 The working principle of the device for removing the misunderstanding of the protection state of the utility model is described in detail:

[0067] In this application, two input circuits, three internal switch units 31 and six first self-locking switches K1 are taken as an example. Three first self-locking switches K1 are connected in series on each input circuit, and are respectively arranged on the AC side, the DC side A and the DC side B, that is, a total of six first self-locking switches K1; each internal switch unit 31 includes one third self-locking switch K3 and one fourth self-locking switch K4, that is, three third self-locking switches K3 and three fourth self-locking switches K4, the first circuit (corresponding to Figure 3 The middle circuit S11-S122) controls the third self-locking switch K3, and the second circuit (corresponding to Figure 3 The middle loop S21-S22) controls the fourth self-locking switch K4.

[0068] Then, firstly, when the energy storage system works normally, the six first self-locking switches K1 and the second self-locking switches K2 are all closed, and the three third self-locking switches K3 and the three fourth self-locking switches K4 are all closed.

[0069] Then, when the energy storage system fails and needs emergency shutdown, the operator presses at least one of the six first self-locking switches K1 at will, and at this time, at least one first self-locking switch K1 is disconnected. Due to the electrical control characteristics of the relay 30, the three third self-locking switches K3 and / or the three fourth self-locking switches K4 are disconnected accordingly, that is, after the first self-locking switch K1 on the first path is disconnected, the three third self-locking switches K3 are disconnected synchronously, or / and after the second self-locking switch K2 on the second path is disconnected, the three fourth self-locking switches K4 are disconnected synchronously.

[0070] Secondly, when the emergency shutdown state needs to be released, the previously disconnected first self-locking switch K1 needs to be closed manually or by computer control. However, only when the first self-locking switch K1 is closed, the relay 30 will control the corresponding disconnected third self-locking switch K3 and / or fourth self-locking switch K4 to close according to the received reset control signal, so as to reopen the circuit where the first self-locking switch K1 is located.

[0071] Furthermore, the utility model also discloses an energy storage system, on which the above-mentioned device for eliminating misunderstanding of the protection state is provided; since the above-mentioned device for eliminating misunderstanding of the protection state is described in detail, it will not be repeated here.

[0072] In summary, the utility model provides a device for preventing misinterpretation of the protection state and an energy storage system. The device controls the first switch module to change from an open state to a closed state, and when the reset control module is in a closed state, the circuit where the first switch module is located is reopened, thereby reconnecting the circuit under dual conditions, thereby improving the safety of the system.

[0073] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.

Claims

1. A device for removing misunderstandings in a protection state, characterized in that: include: A first switch module, a reset control module and a relay; The relay is connected to the first switch module and the reset control module respectively; the first switch module is connected to the input end of the relay, and the reset control module is connected to the reset control end of the relay; The reset control module is used to transmit a reset control signal to the relay when it is in a closed state; the relay is used to control its internal switch unit to close according to the reset control signal after the first switch module changes from an open state to a closed state, so as to reopen the circuit where the first switch module is located.

2. The device for removing the protection state misunderstanding according to claim 1, characterized in that: The first switch module is used to transmit a first switch control signal to the relay when in an off state; the relay is also used to control its internal switch unit to be off according to the first switch control signal, so as to disconnect the circuit where the first switch module is located.

3. The device for removing the protection state misunderstanding according to claim 2, characterized in that: When the first switch module changes from an open state to a closed state, and the reset control module is in a closed state, the relay is used to control the internal switch unit to close according to the received reset control signal to reopen the circuit where the first switch module is located.

4. The device for removing the protection state misunderstanding according to claim 1, characterized in that: Also includes: A second switch module; The second switch module is connected in series between the output end of the relay and the first switch module; the second switch module is used to change the opening and closing state of the second switch module according to the opening and closing state of the internal switch unit to control the conduction or disconnection of the circuit.

5. The device for removing the protection state misunderstanding according to claim 1, characterized in that: Also includes: Power module; The power module is connected to the power input terminal of the relay; the power module is used to provide power supply to the relay.

6. The device for removing the protection state misunderstanding according to claim 4, characterized in that: Also includes: Switch state detection module; the switch state detection module is connected to the relay, and the switch state detection module is used to detect the opening and closing state of the internal switch unit.

7. The device for removing the protection state misunderstanding according to claim 5, characterized in that: The first switch module is arranged on a DC side device or an AC side device, and is used to control whether the DC side device or the AC side device is connected to a circuit.

8. The device for removing the protection state misunderstanding according to claim 6, characterized in that: The first switch module includes: N*M first self-locking switches; each N first self-locking switches are connected in series and are respectively connected in series to the M input circuits of the relay.

9. The device for removing the protection state misunderstanding according to claim 8, characterized in that: The reset control module includes: a second self-locking switch; the second self-locking switch is connected in series to the safety chain reset circuit of the relay.

10. An energy storage system, characterized in that: The energy storage system is provided with a device for eliminating misunderstanding of the protection state as described in any one of claims 1 to 9.

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