A kind of be applied to port combined off-grid energy storage system

Abstract

The utility model relates to energy storage system technical field especially a kind of application in port combined off-grid energy storage system, including alternating current box, its inside is equipped with the PCS converter for AC-DC conversion, the output of PCS converter is connected load n;And, battery box, it is detachably connected between the alternating current box, including several battery clusters arranged inside, for the charging interface of the battery cluster charging and the input of the alternating current box adaptation transmission interface;The utility model is adjusted by the setting of battery pack module quantity, improves the flexibility of system adaptation load electricity demand;Through the flexible connection of battery box and alternating current box, it is convenient that battery box moves to charging pile and charges;It improves the flexibility of energy storage system, response speed, provides more efficient, intelligent energy storage solution for port shore power system.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and in particular to a port-integrated off-grid energy storage system. Background Technology

[0002] The world is undergoing a transition from fossil fuels to renewable energy to reduce greenhouse gas emissions and address climate change. However, traditional port energy systems are characterized by a single configuration and a low level of energy dispatch and interconnection. Coupled with the port's huge daily electricity consumption, high electricity costs, and significant pollution emissions, these factors have become major constraints on the comprehensive development of ports.

[0003] Port energy storage systems can store electrical energy during off-peak hours and release it during peak hours, thus achieving peak shaving and valley filling, reducing peak electricity demand at ports, and lowering electricity procurement costs.

[0004] Existing port energy storage systems are mostly stationary, employing shore power distribution and storage methods, or multi-energy complementarity methods, incorporating renewable energy storage such as photovoltaics and wind power, or utilizing diesel generators. These systems involve large investments, lack flexibility, cannot respond quickly to sudden increases in load demand, and over-configuration of capacity can easily lead to waste. Utility Model Content

[0005] In view of the problem of poor flexibility of port energy storage systems in the above or existing technologies, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a combined off-grid energy storage system for ports.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a port combined off-grid energy storage system, including an AC box, which is equipped with a PCS converter for AC-DC conversion, the output end of the PCS converter being connected to a load; and a battery box, which is detachably connected to the AC box, including a plurality of battery clusters disposed inside, a charging interface for charging the battery clusters, and a power transmission interface adapted to the input end of the AC box.

[0008] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, the battery cluster is connected to a high-voltage box, the power transmission interface and the charging interface are respectively connected to the battery cluster through the high-voltage box, and the power transmission interface is connected to the AC box charging port of the AC box.

[0009] As a preferred embodiment of this utility model applied to a port-type combined off-grid energy storage system, wherein: An EMS module is provided between the PCS converter and the AC box charging port. The EMS module includes a CAN interface electrically connected to the AC box charging port, a LAN interface communicating with the cloud platform, and a LAN interface electrically connected to the PCS converter.

[0010] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, wherein: a DC circuit breaker and a positive contactor are connected in series on the positive side of the high-voltage box, and a pre-charging contactor and a pre-charging resistor are connected in parallel on the positive contactor; a negative contactor and a DC fuse are connected in series on the negative side.

[0011] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, the battery cluster includes several sets of battery pack modules connected in series, each battery pack module is connected to a BMS slave controller, and the BMS slave controller is connected to the BMS master controller of the high-voltage box.

[0012] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, the CAN interface of the BMS master controller is connected to the power transmission interface and the charging interface respectively, and the IP and IM interfaces of the BMS master controller are connected to the BMS slave controller.

[0013] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, wherein: the positive electrode side of the battery cluster is connected to the positive electrode side of the high-voltage box, and the negative electrode side of the battery cluster is connected to the negative electrode side of the high-voltage box.

[0014] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, wherein: the positive side of the high-voltage box is connected to the positive busbar of the power transmission interface and the positive busbar of the charging interface, and the negative side of the high-voltage box is connected to the negative busbar of the power transmission interface and the negative busbar of the charging interface.

[0015] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, the PCS converters are configured in parallel as multiple units, and the parallel PCS converters are connected in series with the parallel AC box charging ports.

[0016] As a preferred embodiment of this utility model applied to a port combined off-grid energy storage system, a circuit breaker is provided between the PCS converter and the load.

[0017] The beneficial effects of this utility model applied to port combined off-grid energy storage systems are as follows: This utility model improves the system's flexibility in adapting to load power demand by adjusting the number of battery pack modules; the flexible connection between the battery box and the AC box facilitates the movement of the battery box to the charging station for charging; it improves the flexibility and response speed of the energy storage system, providing a more efficient and intelligent energy storage solution for port shore power systems. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 It is a component of the port's energy storage system.

[0020] Figure 2 This is the electrical topology diagram of the AC box.

[0021] Figure 3 This is the electrical topology diagram of the battery box.

[0022] Figure 4 This is the circuit diagram for the AC box.

[0023] Figure 5 This is the circuit diagram for the battery box. Detailed Implementation

[0024] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0026] Reference Figure 1 As a first embodiment of the present invention, a port combined off-grid energy storage system is provided, including a battery box 200 and an AC box 100.

[0027] The AC box 100 is equipped with a PCS converter 101 for AC-DC conversion. The output terminal of the PCS converter 101 is connected to the load n. The DC power output from the battery box 200 is converted into AC power with a frequency of 50Hz or 60Hz by the PCS converter 101 to power the load n.

[0028] The battery box 200 serves as the power source for the off-grid energy storage system. When the power is insufficient, it can be detached from the AC box 100 and moved to a charging station for charging. Furthermore, the battery box 200 contains several battery clusters 203, as well as a charging interface 202 for charging the battery clusters 203 and a power transmission interface 201 adapted to the input terminal of the AC box 100.

[0029] Reference Figure 2 As a second embodiment of the present invention, unlike the previous embodiment, the battery box 200 has one power transmission interface 201 and one or two charging interfaces 202. The battery box 200 is connected to a charging pile m through the charging interface 202, and the power of the charging pile m is used to charge the battery box 200; the battery box 200 discharges through the power transmission interface 201.

[0030] Reference Figure 4 The AC box 100 also has an AC box charging port 102; the AC box charging port 102 is connected to the power transmission interface 201, and the DC power of the battery box 200 is introduced to the PCS converter 101 through the cooperation of the AC box charging port 102 and the power transmission interface 201.

[0031] Specifically, the positive terminal of the AC box charging port 102 is connected to the positive terminal of the PCS converter 101, and the negative terminal of the AC box charging port 102 is connected to the negative terminal of the PCS converter 101. The DC power output from the battery box 200 is converted into three-phase AC power output in the PCS converter 101. A circuit breaker 104 and a surge protection device 105 are installed at the output terminal.

[0032] The battery cluster 203 of the battery box 200 is connected to the high voltage box 204. The power transmission interface 201 and the charging interface 202 are respectively connected to the high voltage box 204. The charging and discharging of the battery cluster 203 are carried out through the high voltage box 204. The battery cluster 203 is specifically 1P260S261kWh.

[0033] Specifically, on the positive side of the high-voltage box 204, a DC circuit breaker 104a and a positive contactor 204b are connected in series. The DC circuit breaker 104a is model NDM3Z-250Z / 4321 250A J2(CS1-A) DC1000V, and the positive contactor 204b is model EVQ250G24DA511-0S40-5E-1000. A pre-charging contactor 104c and a pre-charging resistor 204d are connected in parallel with the positive contactor 204b. The pre-charging contactor 104c is model EVQ30E24DA111-0D40-1B-1000, and the pre-charging resistor 204d is model RX24 100W. 100R; The negative circuit is connected in series with a negative contactor 204e and a DC fuse 204f. The negative contactor 204e is model EVQ250G24DA511-0S40-5E-1000, and the DC fuse 204f is model RS306-01 T5Z 315A-TDC1000V.

[0034] Furthermore, the battery cluster 203 includes several battery pack modules 203a connected in series. The number of battery pack modules 203a can be configured according to the actual power demand and charging / discharging time. Specifically, the battery pack module 203a is 1P52S 52.25kWh and uses a 314Ah lithium iron phosphate battery.

[0035] Reference Figure 2 and Figure 5 Each battery pack module 203a is connected to a BMS slave controller 203b, model BCU-L3764-BD. The BMS slave controller 203b is the slave control unit of the battery management system, responsible for monitoring and managing the status of individual battery pack modules. The BMS slave controller 203b is connected to the BMS master controller 204g of the high-voltage box 204. The BMS master controller 204g is model BCMU-WV5.1, which is the master control unit of the battery management system, responsible for monitoring and managing the status of the battery clusters.

[0036] BMS slave module 203b communicates with BMS master module 204g, receives control commands from BMS master module 204g, and provides feedback on battery pack status information.

[0037] Specifically, the CAN interface of the BMS master controller 204g is connected to the power transmission interface 201 and the charging interface 202, and the IP1 and IM1 interfaces of the BMS master controller 204g are connected to the BMS slave controller 203b.

[0038] The BMS main controller 204g can be controlled via DI / DO. OUT1 controls the main positive contactor; OUT3 controls the main negative contactor; OUT2 controls the pre-charge contactor; OUT4 is a red light; OUT5 is a green light; OUT6 controls the fan; OUT7 controls the circuit breaker shunt trip; I01 provides feedback to the main positive contactor (normally open); I02 provides feedback to the main negative contactor (normally open); I04 provides feedback to the circuit breaker (normally open).

[0039] Furthermore, the positive side of the battery cluster 203 is connected to the positive circuit of the high-voltage box 204, and the negative side of the battery cluster 203 is connected to the negative circuit of the high-voltage box 204.

[0040] The positive circuit of the high-voltage box 204 is connected to the positive bus of the power transmission interface 201 and the positive bus of the charging interface 202, respectively, and the negative circuit of the high-voltage box 204 is connected to the negative bus of the power transmission interface 201 and the negative bus of the charging interface 202.

[0041] Reference Figure 3 As a third embodiment of the present invention, unlike the previous embodiment, the AC box 100 also has a plurality of AC box charging ports 102 connected in parallel. Each AC box charging port 102 is connected to a set of power transmission interfaces 201 of the battery box 200. The DC power in the battery box 200 is transmitted to the AC box charging port 102 through the power transmission interface 201.

[0042] Preferably, multiple PCS converters 101 are configured in parallel, and the parallel PCS converters 101 are connected in series with the parallel AC box charging ports 102 to meet the power demand of the load.

[0043] Preferably, a circuit breaker 104 is provided between the PCS converter 101 and the load n to disconnect and connect the PCS converter 101 and the load n.

[0044] Reference Figures 3 to 5 As the fourth embodiment of this utility model, unlike the previous embodiment, an EMS module 103 is provided between the PCS converter 101 and the AC box charging port 102.

[0045] The EMS module 103 is used for coordinated control operation, providing an efficient real-time monitoring system that rapidly collects and processes equipment operation data within the system. It offers an intuitive and user-friendly interface for easy operation and data interpretation. The EMS module 103 can communicate with the PCS converter 101 inside the AC box 100, and can also establish communication with external devices via the AC box charging port 102. All data can be uploaded to the cloud platform via a 4G network, facilitating remote operation and maintenance and real-time monitoring of operational status.

[0046] Specifically, the EMS module 103 is controlled by DI / DO and can display the following indicators respectively: DO1: system cabinet operation indicator, DO2: system cabinet fault indicator, DI1: water immersion normally open, DI4: surge normally open, DI5: access control normally closed, and DI7: emergency stop switch normally open.

[0047] The CAN1 interface of the EMS module 103 is connected to the charging port 102 of the AC box, the LAN1 interface is connected to the cloud platform via the 4G network, and the LAN0 interface is connected to the PCS converter 101.

[0048] This solution optimizes the energy storage system design and enhances its dynamic adjustment capabilities by focusing on product flexibility, capacity configuration, and rapid response. Through flexible expansion and modular design, the system can dynamically adjust its capacity according to load demand, avoiding resource waste and improving its ability to handle sudden power surges. Simultaneously, advanced energy storage control technology enables accurate prediction and rapid response to port power loads, further improving the system's economy and stability. Therefore, this system aims to address the problems of poor flexibility, slow response, and wasted investment in existing energy storage systems, providing a more efficient and intelligent energy storage solution for port shore power systems.

[0049] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of this utility model.

Claims

1. A port-integrated off-grid energy storage system, characterized in that: include, An AC box (100) is provided, which contains a PCS converter (101) for AC-DC conversion, the output of which is connected to a load (n); and, The battery box (200), which is detachably connected to the AC box (100), includes a plurality of battery clusters (203) disposed inside, a charging interface (202) for charging the battery clusters (203), and a power transmission interface (201) adapted to the input terminal of the AC box (100).

2. The port-integrated off-grid energy storage system as described in claim 1, characterized in that: The battery cluster (203) is connected to a high-voltage box (204). The power transmission interface (201) and the charging interface (202) are respectively connected to the battery cluster (203) through the high-voltage box (204). The power transmission interface (201) is connected to the AC box charging port (102) of the AC box (100).

3. The port-integrated off-grid energy storage system as described in claim 2, characterized in that: An EMS module (103) is provided between the PCS converter (101) and the AC box charging port (102). The EMS module (103) includes a CAN1 interface electrically connected to the AC box charging port (102), a LAN1 interface connected to the cloud platform, and a LAN0 interface electrically connected to the PCS converter (101).

4. The port-integrated off-grid energy storage system as described in claim 2 or 3, characterized in that: The high-voltage box (204) has a DC circuit breaker (204a) and a positive contactor (204b) connected in series on the positive side, and a pre-charge contactor (204c) and a pre-charge resistor (204d) connected in parallel on the positive contactor (204b); and a negative contactor (204e) and a DC fuse (204f) connected in series on the negative side.

5. The port-integrated off-grid energy storage system as described in any one of claims 1 to 3, characterized in that: The battery cluster (203) includes several sets of battery pack modules (203a) connected in series. Each battery pack module (203a) is connected to a BMS slave controller (203b), and the BMS slave controller (203b) is connected to the BMS master controller (204g) of the high voltage box (204).

6. The port-integrated off-grid energy storage system as described in claim 5, characterized in that: The CAN interface of the BMS master controller (204g) is connected to the power transmission interface (201) and the charging interface (202) respectively, and the IP1 and IM1 interfaces of the BMS master controller (204g) are connected to the BMS slave controller (203b).

7. The port-integrated off-grid energy storage system as described in any one of claims 2, 3, and 6, characterized in that: The positive electrode side of the battery cluster (203) is connected to the positive electrode side of the high voltage box (204), and the negative electrode side of the battery cluster (203) is connected to the negative electrode side of the high voltage box (204).

8. The port-integrated off-grid energy storage system as described in any one of claims 2, 3, and 6, characterized in that: The positive side of the high-voltage box (204) is connected to the positive busbar of the power transmission interface (201) and the positive busbar of the charging interface (202), and the negative side of the high-voltage box (204) is connected to the negative busbar of the power transmission interface (201) and the negative busbar of the charging interface (202).

9. The port-integrated off-grid energy storage system as described in claim 2 or 3, characterized in that: The PCS converters (101) are configured in parallel in multiple ways, and the PCS converters (101) connected in parallel are connected in series with the AC box charging ports (102) connected in parallel.

10. The port-integrated off-grid energy storage system as described in any one of claims 1, 2, 3, or 6, characterized in that: A circuit breaker (104) is provided between the PCS converter (101) and the load (n).

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