Energy storage direct current load cut-off device and energy storage system

Abstract

The utility model discloses an energy storage direct current load cut-off device and an energy storage system, and relates to the technical field of energy storage, the energy storage direct current load cut-off device can be installed between an energy storage converter and an energy storage battery, and the energy storage direct current load cut-off device comprises a direct current switch module which is respectively connected with the energy storage converter and the energy storage battery; and the control module is connected with the direct-current switch module and is used for controlling the switch module to execute a disconnection action so as to cut off the connection between the energy storage battery and the energy storage converter. According to the invention, the timeliness of abnormal energy storage battery loop cut-off can be improved, and the operation safety of the energy storage system is ensured.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage DC load disconnecting device and an energy storage system. Background Art

[0002] Related technologies monitor the energy storage system's battery capacity, voltage, and current in real time. When operators identify an abnormality in the DC circuit of the energy storage converter based on this monitoring information, they can manually disconnect the abnormal battery from the converter to isolate the abnormal DC circuit. However, this method is not very effective and can affect the safe operation of the energy storage system. Utility Model Content

[0003] The main purpose of this application is to provide an energy storage DC load disconnection device and an energy storage system, aiming to solve the technical problem of poor timeliness of abnormal circuit disconnection, which affects the operational safety of the energy storage system.

[0004] To achieve the above objectives, the present application proposes an energy storage DC load disconnection device, which can be installed between an energy storage converter and an energy storage battery. The energy storage DC load disconnection device includes:

[0005] A DC switch module, the DC switch module is connected to the energy storage converter and the energy storage battery respectively;

[0006] The control module is connected to the DC switch module and is used to control the switch module to perform a disconnection action to cut off the connection between the energy storage battery and the energy storage converter.

[0007] In one embodiment, the DC switch module includes:

[0008] A DC switch, wherein the DC switch is connected to the energy storage converter and the energy storage battery respectively;

[0009] An actuating member is provided at the DC switch and is in communication with the control module, the actuating member being configured to be switchable between an actuating state for disconnecting the DC switch and a closing state for connecting the DC switch;

[0010] The control module controls the action element to switch between the action state and the closing state.

[0011] In one embodiment, the actuating member is a tripper.

[0012] In one embodiment, the trip unit is a shunt trip unit or an electronic trip unit.

[0013] In one embodiment, the DC switch module further includes:

[0014] The switch status monitoring unit is provided on the DC switch and is in communication connection with the control module. The switch status monitoring unit is used to monitor the opening and closing status of the DC switch and send the opening and closing status to the control module.

[0015] In one embodiment, the energy storage DC load disconnection device further includes:

[0016] The remote communication module is connected to the control module and is used to receive switch control instructions sent by the user at the remote operation console and forward them to the control module.

[0017] In addition, to achieve the above objectives, the present application also proposes an energy storage system, which includes:

[0018] Energy storage converter;

[0019] Such as the above-mentioned energy storage DC load disconnection device;

[0020] Energy storage battery, the energy storage battery is connected to the energy storage converter through the energy storage DC load disconnection device.

[0021] In one embodiment, the energy storage system further includes:

[0022] The abnormality monitoring module is used to monitor the operating status of the energy storage battery. When the energy storage battery operates abnormally, it sends a switch control instruction to the control module so that the control module controls the DC switch module to perform a disconnection action according to the switch control instruction, thereby cutting off the connection between the energy storage battery and the energy storage converter.

[0023] In one embodiment, the energy storage system further includes:

[0024] Transformer, the transformer is connected to the energy storage converter;

[0025] The grid is connected to the transformer.

[0026] In one embodiment, the energy storage system includes at least one energy storage battery, and each energy storage battery is connected to the energy storage converter via an energy storage DC load disconnecting device.

[0027] One or more technical solutions proposed in this application have at least the following technical effects:

[0028] The energy storage DC load disconnection device provided in the present application can be installed between the energy storage converter and the energy storage battery. The energy storage DC load disconnection device includes: a DC switch module, which is connected to the energy storage converter and the energy storage battery respectively; and a control module, which is connected to the DC switch module and can control the switch module to perform a disconnection action to cut off the connection between the energy storage battery and the energy storage converter.

[0029] Therefore, when an abnormality occurs in the energy storage battery, a control instruction can be sent to the control module, which directly controls the DC switch module to disconnect the connection between the energy storage battery and the energy storage converter. This eliminates the need for manual on-site operation to cut off the abnormal energy storage battery circuit, thereby improving the convenience and timeliness of abnormality handling and enhancing the operational safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A flow chart of the first embodiment of the energy storage DC load disconnection device provided in this application;

[0033] Figure 2 A schematic diagram of a process flow provided for the first embodiment of the energy storage system of this application;

[0034] Figure 3 This is a schematic structural diagram of an exemplary energy storage DC load disconnection device;

[0035] Figure 4 A schematic diagram of the structure of an energy storage system of an example.

[0036] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] 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 for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] Currently, renewable energy power generation is developing towards large-scale centralized control, and the accompanying energy storage power stations are also developing towards large-scale centralized control. In related technologies, large-scale centralized control energy storage power stations can achieve real-time monitoring of the energy storage unit (energy storage battery) connected to the energy storage device in the energy storage system, including power storage, voltage, and current information. When the operating staff determines that there is an abnormality in the DC circuit of the energy storage converter based on the monitoring information, they can manually disconnect the abnormal energy storage battery connected to the energy storage converter on site to cut off the abnormal DC circuit. However, this processing method has poor timeliness and will have a certain impact on the safe operation of the energy storage system.

[0041] To address this technical problem, the present application proposes an energy storage DC load disconnection device that can be installed between an energy storage converter and an energy storage battery. The energy storage DC load disconnection device includes: a DC switch module, which is connected to the energy storage converter and the energy storage battery, respectively; and a control module, which is connected to the DC switch module and can control the switch module to perform a disconnection action to cut off the connection between the energy storage battery and the energy storage converter.

[0042] Therefore, when an abnormality occurs in the energy storage battery, a control instruction can be sent to the control module, which directly controls the DC switch module to disconnect the connection between the energy storage battery and the energy storage converter. This eliminates the need for manual on-site operation to cut off the abnormal energy storage battery circuit, thereby improving the convenience and timeliness of abnormality handling and enhancing the operational safety of the energy storage system.

[0043] The following will describe and introduce the present invention through multiple embodiments.

[0044] See also Figure 1 , Figure 1 This is a structural diagram of Example 1 of the energy storage DC load disconnection device of this application.

[0045] In this embodiment, the energy storage DC load disconnection device can be installed between the energy storage converter and the energy storage battery. The energy storage DC load disconnection device includes:

[0046] A DC switch module, the DC switch module is connected to the energy storage converter and the energy storage battery respectively;

[0047] The control module is connected to the DC switch module and is used to control the switch module to perform a disconnection action to cut off the connection between the energy storage battery and the energy storage converter.

[0048] Specifically, the DC switch module is connected to the energy storage converter and the energy storage battery, respectively, and can be used to implement a switching function in the DC circuit on the DC side of the energy storage converter. The control module is connected to the DC switch module. The control module can receive command signals from the energy storage system monitoring background or the operator, and control the DC switch module to perform a disconnection action based on preset logical conditions to sever the connection between the energy storage battery and the energy storage converter. This allows for a quick response when an anomaly occurs in the DC circuit of the energy storage converter, controlling the DC switch module to disconnect and cut off the abnormal energy storage battery circuit, ensuring the safe operation of the energy storage system.

[0049] In a feasible implementation, the DC switch module may include:

[0050] A DC switch, wherein the DC switch is connected to the energy storage converter and the energy storage battery respectively;

[0051] An action member is provided at the DC switch and is in communication with the control module. The action member is constructed to be switchable between an action state for disconnecting the DC switch and a closing state for connecting the DC switch. The control module controls the action member to switch between the action state and the closing state.

[0052] Specifically, the DC switch is connected to the energy storage converter and the energy storage battery, respectively, and can be used to open or close the current path in the DC circuit; the actuator provided at the DC switch can act on the DC switch to change the open and close state of the DC switch, and the control module can control the actuator to switch between the action state and the closing state through a communication connection with the actuator to realize the disconnection and conduction operation of the DC switch. The above-mentioned actuator can be an electric mechanism, an electromagnetic mechanism, or other device that can be operated under an electric control signal. In a feasible embodiment, the actuator can be a trip unit; the trip unit can be a shunt trip unit or an electronic trip unit.

[0053] The DC switch module may further include: a switch status monitoring unit, which is arranged on the DC switch and is communicatively connected to the control module. The switch status monitoring unit can be used to monitor the opening and closing status of the DC switch and send the opening and closing status to the control module.

[0054] It is understandable that in order to ensure that the DC switch has completed the disconnection operation correctly and ensure the safety of the energy storage system operation, a switch state monitoring unit can be set at the DC switch to monitor the opening and closing state of the DC switch in real time and feed back the opening and closing state to the control module. For example, after the control module controls the action member to act to disconnect the DC switch, the current opening and closing state of the DC switch can be monitored by the switch state monitoring unit and sent to the control module. If the monitored opening and closing state shows that the DC switch is still in the on state, it indicates that the disconnection operation of the DC switch is not completed correctly. At this time, the DC switch module can be further controlled by the control module to ensure that the DC switch is successfully disconnected. The switch state monitoring unit can be an auxiliary contact set on the DC switch. The auxiliary contact includes an open auxiliary contact and a closed auxiliary contact. When the DC switch is in the closed state (i.e., conductive), the open auxiliary contact in the auxiliary contact is closed and the closed auxiliary contact is disconnected; when the DC switch is in the open state (i.e., disconnected), the open auxiliary contact in the auxiliary contact is disconnected and the closed auxiliary contact is closed. The opening and closing state of the DC switch can be accurately monitored through the auxiliary contacts.

[0055] In addition, the energy storage DC load disconnect device may also include a remote communication module, which is connected to the control module and can receive switch control instructions sent by the user at the remote operation console and forward them to the control module. The remote communication module can establish a communication link with the remote operation console and transmit data via a network (such as Ethernet, wireless network, etc.). The operator can send switch control instructions (such as switch disconnect instructions, switch conduction instructions, etc.) through the remote operation console. When the remote communication module receives the switch control instructions sent by the operator, it can forward the instructions to the control module, so that the control module responds to the switch control instructions and controls the DC switch module to perform the corresponding action. This can achieve remote control of the DC switch module, improving the flexibility and efficiency of energy storage system control.

[0056] This application also proposes an energy storage system, which includes an energy storage converter, an energy storage battery and the above-mentioned energy storage DC load disconnection device. Figure 3 As shown, Figure 3 Schematic diagram of the structure of the energy storage system; the specific structure of the energy storage DC load disconnection device refers to the above embodiment. Since the energy storage system of the present application adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0057] Among them, the energy storage converter is a device for storing and releasing electrical energy, and can realize the AC-DC conversion of the current source; the energy storage battery is connected to the energy storage converter through the energy storage DC load disconnection device, and can store the DC power converted by the energy storage converter. In a feasible embodiment, the energy storage system can also include a transformer and a power grid; the power grid can be connected to the energy storage converter through the transformer; in this system, the transformer can reduce the voltage of the high-voltage AC power provided by the power grid and send it to the energy storage converter, and the energy storage converter converts the reduced AC power into DC power and stores it in the energy storage battery. The energy storage battery can convert electrical energy into chemical energy for storage; when it is necessary to supply power from the energy storage battery to the power grid or other loads, the energy storage converter can extract the electrical energy stored in the energy storage battery and convert it into the AC power required by the power grid for feeding.

[0058] In addition, the energy storage system may also include an abnormality monitoring module, which can be used to monitor the operating status of the energy storage battery. When the energy storage battery operates abnormally, it sends a switch control instruction to the control module, so that the control module controls the DC switch module to perform a disconnection action according to the switch control instruction, thereby cutting off the connection between the energy storage battery and the energy storage converter. The abnormality monitoring module can be a battery management system with a monitoring function, which can monitor various operating parameters of the energy storage battery (such as current, power, temperature, etc.) in real time. When the above operating parameters differ from normal values, it can be determined that the energy storage battery is operating abnormally. Therefore, a switch control instruction can be sent to the control module, so that the control module can respond to the switch control instruction and control the corresponding DC switch module to perform a disconnection operation, so that the abnormal energy storage battery is disconnected from the energy storage converter, thereby ensuring the safe operation of the energy storage system. The energy storage system may include at least one energy storage battery, each of which is connected to the energy storage converter via a corresponding energy storage DC load disconnection device. Therefore, when an abnormality occurs in the DC circuit of a certain energy storage battery, the energy storage DC load disconnection device corresponding to that circuit can be controlled to disconnect, thereby accurately disconnecting the abnormal circuit without affecting the remaining normal energy storage battery circuits, thereby ensuring the operational stability of the energy storage system.

[0059] It can be understood that in the energy storage system provided by this embodiment, the control module in the energy storage DC load disconnection device can directly control the DC switch module to operate to disconnect the connection between the abnormal energy storage battery and the energy storage converter, without the need for manual operation on site to cut off the abnormal energy storage battery circuit, thereby improving the convenience and timeliness of abnormality handling and enhancing the operational safety of the energy storage system.

[0060] For example, to help understand the energy storage DC load disconnection device and energy storage system provided in the embodiment of the present application, please refer to Figures 3-4 , specifically:

[0061] Figure 3A schematic diagram of the structure of an exemplary energy storage DC load disconnection device is provided. Figure 3 The measurement and control device shown is the control module in the above embodiment, and the auxiliary contact is the switch state monitoring unit in the DC switch module. Figure 3 The 220V power supply is used to power the trip unit; the switch is the above-mentioned remote communication module. Figure 4 is a structural diagram of an energy storage system as an example, Figure 4 The system shown includes multiple energy storage converters (PCS1, PCS2, and so on), which can be connected to the load or grid via transformer T. Load switches QS enable unified connection and disconnection of these converters from the grid or load. Each energy storage converter is connected to multiple energy storage batteries (battery cluster PACK1, battery cluster PACK2, and battery cluster PACK9), each of which is connected to the converter via a corresponding energy storage DC load disconnect device (K1 to K9). On-duty personnel can inspect the operating parameters of various parts of the energy storage system from the energy storage system monitoring backend. If the battery temperature in a battery cluster (such as PACK1) circuit is too high, they can select the energy storage DC load disconnect device K1 for that battery cluster on the monitoring backend remote control interface and click to trip the device. This trip control command is then sent via the communication line to the measurement and control device (i.e., the control module). Upon receiving the trip command, the measurement and control device converts the command into digital information and outputs a node closure signal via the I / O board (input / output board), connecting the trip unit to its power supply. The trip unit then acts on the DC switch, causing it to trip. The DC switch's auxiliary contacts (i.e., the switch status monitoring unit) then feed the DC switch trip signal back to the measurement and control device's I / O board. The measurement and control device then converts the DC switch trip digital information into communication information and transmits it to the monitoring backend via the switch. The DC switch corresponding to that battery cluster changes position on the monitoring backend's remote control interface, completing the operation of disconnecting PACK1 from the energy storage system. Through the above operations, the operation staff on duty can remotely disconnect the battery cluster circuit in the monitoring background, which not only improves the timeliness of the operation, but also avoids on-site operation in severe weather such as thunderstorms and sandstorms, which may cause equipment damage or personal injury.

[0062] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the energy storage DC load disconnection device and energy storage system of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0063] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A DC load disconnect device for energy storage, installed between an energy storage converter and an energy storage battery, characterized in that: The energy storage DC load disconnecting device comprises: a DC switch module, wherein the DC switch module is connected to the energy storage converter and the energy storage battery respectively; a control module, the control module being connected to the DC switch module and configured to control the switch module to perform a disconnection action to cut off the connection between the energy storage battery and the energy storage converter; The DC switch module includes: a DC switch, the DC switch being connected to the energy storage converter and the energy storage battery respectively; an action member, the action member being disposed at the DC switch and communicatively connected to the control module, the action member being configured to be switchable between an action state for disconnecting the DC switch and a closing state for connecting the DC switch; Wherein, the control module controls the actuating member to switch between the actuating state and the closing state.

2. The energy storage DC load disconnecting device according to claim 1, characterized in that: The actuating element is a tripper.

3. The energy storage DC load disconnecting device according to claim 2, characterized in that: The release is a shunt release or an electronic release.

4. The energy storage DC load disconnecting device according to claim 1, characterized in that: The DC switch module further includes: A switch status monitoring unit is provided on the DC switch and is in communication with the control module. The switch status monitoring unit is used to monitor the opening and closing status of the DC switch and send the opening and closing status to the control module.

5. The energy storage DC load disconnecting device according to any one of claims 1 to 4, characterized in that: The energy storage DC load disconnecting device further includes: A remote communication module is connected to the control module and is used to receive switch control instructions sent by the user at the remote operation console and forward the instructions to the control module.

6. An energy storage system, characterized in that: The energy storage system comprises: Energy storage converter; The energy storage DC load disconnecting device according to any one of claims 1 to 5; An energy storage battery is connected to the energy storage converter via the energy storage DC load disconnection device.

7. The energy storage system according to claim 6, characterized in that: The energy storage system further includes: An abnormality monitoring module is used to monitor the operating status of the energy storage battery and send a switch control instruction to the control module when the energy storage battery operates abnormally, so that the control module controls the DC switch module to perform a disconnection action according to the switch control instruction, thereby cutting off the connection between the energy storage battery and the energy storage converter.

8. The energy storage system according to claim 7, characterized in that: The energy storage system further includes: a transformer connected to the energy storage converter; A power grid is connected to the transformer.

9. The energy storage system according to any one of claims 6 to 8, characterized in that: The energy storage system includes at least one energy storage battery, and each of the energy storage batteries is connected to the energy storage converter via one of the energy storage DC load disconnecting devices.

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