Single-machine high-capacity multi-container high-voltage direct-hanging energy storage control system

Abstract

The utility model discloses a single-machine high-capacity multi-container high-voltage direct-hanging energy storage control system which comprises a high-voltage direct-hanging energy storage system master controller, a high-voltage direct-hanging energy storage system branch bin controller and a high-voltage direct-hanging energy storage system unit controller. The master controller communicates with and controls the plurality of sub-warehouse controllers through a plurality of paths of high-speed optical fiber interfaces; the sub-warehouse controllers are respectively placed in the independent energy storage containers; the sub-warehouse controllers are respectively communicated and controlled with all unit controllers in the container through a plurality of common optical fiber interfaces; the unit controller completes wave sending control and protection on the power unit through the driving device; and the power unit controller has a function of managing the battery cluster connected with the power unit. The control system provided by the utility model can meet the complete machine control and communication requirements of a high-voltage direct-hanging energy storage system which needs a plurality of containers and has high capacity of a single machine. Meanwhile, the control system provided by the utility model integrates power unit control, battery management and communication management, so that the control safety and reliability of the single-machine high-voltage direct-hanging energy storage system are improved, and the hardware investment cost is reduced.

Description

Technical Field

[0001] The utility model relates to an energy storage control system, and more specifically, to a single-machine, large-capacity, multi-container high-voltage direct-mounted energy storage control system. Technical Background

[0002] With the advancement of the country's "dual carbon" goals, the energy storage industry has ushered in a major development. Among all current energy storage technologies, the cost of electrochemical energy storage systems represented by lithium-ion batteries continues to decline and the technology is more mature. High-voltage direct-mounted energy storage systems have gradually been accepted by the market and well promoted due to their advantages such as large single-unit capacity, high system efficiency, high grid-connected power quality, and direct connection to 6kV, 10kV, and 35kV power grids without transformers.

[0003] As the capacity of a single high-voltage direct-mounted energy storage system gradually increases, a single system requires multiple power units and corresponding battery clusters. From the perspective of structural volume, a single unit requires multiple containers. From the perspective of control and communication, the control and communication between the management systems of multiple battery clusters, power unit control systems, fire protection systems, cooling systems, and other auxiliary control systems, as well as how to ensure the safety and efficiency of communication links across warehouses have become difficult problems.

[0004] The existing high-voltage direct-mounted energy storage control system does not meet the control requirements of a single machine with multiple containers. Secondly, the energy storage inverter control system and the battery management system are two independent systems that are difficult to communicate with each other. For a single-machine large-capacity energy storage system, information exchange between the energy storage inverter and the battery management system is crucial. At the same time, the control of the high-voltage direct-mounted energy storage system requires insulation isolation. If the energy storage inverter control and the battery management system communicate independently, two sets of insulation facilities are required, which increases the hardware cost. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a high-voltage direct-mounted energy storage control system, which can meet the needs of a single machine for multiple containers and is compatible with battery management functions.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a single-machine large-capacity multi-container high-voltage direct-mounted energy storage control system, including a high-voltage direct-mounted energy storage system master controller, a high-voltage direct-mounted energy storage system compartment controller, and a high-voltage direct-mounted energy storage system unit controller, and a high-voltage direct-mounted energy storage system compartment controller is respectively arranged in each energy storage container;

[0007] The main controller of the high-voltage direct-mounted energy storage system communicates and controls the multiple compartment controllers of the high-voltage direct-mounted energy storage system through a multi-channel high-speed optical fiber interface;

[0008] The high-voltage direct-mounted energy storage system compartment controller communicates and controls all high-voltage direct-mounted energy storage system unit controllers in the same container through multiple common optical fiber interfaces;

[0009] The high-voltage direct-mounted energy storage system unit controller completes the wave control and protection of the power unit through the driving device, and the high-voltage direct-mounted energy storage system unit controller serves as a battery management system to manage the battery according to the power unit voltage, current and battery cluster PACK information.

[0010] The improvement of the utility model lies in the use of a hierarchical control topology and the selection of related communication links in the energy storage control system. The specific control process and implementation methods such as the control of the sub-compartment controller by the master controller, the control of the sub-compartment controller by the unit controller, and the management of the power unit and battery by the unit controller are prior art.

[0011] Preferably, both the high-speed optical fiber interface and the ordinary optical fiber interface adopt a custom communication protocol, which classifies the communication content and transmits it in time and segment according to the communication rate requirements, taking into account the communication rate and communication capacity. The specific format is "start frame + fixed high-speed information frame + coded information frame + check frame + stop frame". The communication protocol classifies the communication content and transmits it in time and segment according to the communication rate requirements. The fixed high-speed information frame is transmitted once in each communication, and the slow information is encoded and put into the coded information frame. The communication format takes into account the communication rate and communication capacity.

[0012] Preferably, the main controller of the high-voltage direct-mounted energy storage system is preset with multiple external RS485, LAN, and CAN communication interfaces for communicating with and controlling the host computer and auxiliary equipment; one of the multiple LAN communication interfaces is connected to the touch screen for human-computer interaction; two of the multiple LAN communication interfaces communicate with the host computer energy management system; the main controller of the high-voltage direct-mounted energy storage system is preset with multiple IO interfaces for controlling peripherals.

[0013] Preferably, the high-voltage direct-mounted energy storage system compartment controller is preset with multiple external RS485 and CAN communication interfaces for communicating and controlling the cooling system and fire protection system of the energy storage container; the high-voltage direct-mounted energy storage system compartment controller is preset with multiple IO interfaces for controlling peripherals.

[0014] Preferably, the high-voltage direct-mounted energy storage system unit controller presets two network ports for data exchange with the battery cluster PACK corresponding to the power unit through a ring topology; the high-voltage direct-mounted energy storage system unit controller presets multiple IO interfaces for peripheral control.

[0015] The benefits of the utility model are:

[0016] 1. The hierarchical control topology of master controller, compartment controller and unit controller can meet the application scenarios where a single-machine large-capacity high-voltage direct-mounted energy storage system requires multiple containers.

[0017] 2. The unit controller includes a battery management function and exchanges information with the master controller through the communication link described in the utility model. It is compatible with the functions of the battery management system, making the communication link of the entire energy storage system simpler and more efficient, while reducing the hardware investment cost.

[0018] 3. All-fiber communication and customized communication protocols are used between the main controller, sub-compartment controller, and unit controller to improve the safety and efficiency of system communication and control.

[0019] 4. In view of the high insulation strength requirements of the direct-mounted energy storage system, all-fiber communication is adopted between the main controller, sub-compartment controller, and unit controller to meet the insulation strength requirements of 6KV, 10KV and 35KV. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of high-voltage direct-mounted energy storage topology;

[0021] Figure 2 Schematic diagram of the large-capacity multi-container direct-mounted energy storage control system of the utility model. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the utility model, the following Figure 1 and attached Figure 2 The specific embodiments further illustrate the present invention.

[0023] like Figure 1 The figure shows a topological diagram of high-voltage direct-mounted energy storage applicable to the control system of the utility model, which mainly includes a grid-connected reactor and a cascade unit. The cascade unit includes an H-bridge power unit composed of IGBTs and a battery cluster.

[0024] like Figure 2 As shown, it is a schematic diagram of the large-capacity multi-container direct-mounted energy storage control system proposed in the utility model. This embodiment takes a 35kV, 25MW, 50MWh high-voltage direct-mounted energy storage system as an example to illustrate the proposed control system. The parameters of the high-voltage direct-mounted energy storage system are shown in Table 1.

[0025] Table 1 High-voltage direct-mounted energy storage system parameters

[0026]

[0027] In this embodiment, a single-machine large-capacity multi-container high-voltage direct-mounted energy storage control system adopts a hierarchical control concept and includes 1 high-voltage direct-mounted energy storage system master controller, 9 high-voltage direct-mounted energy storage system compartment controllers, and 180 high-voltage direct-mounted energy storage system unit controllers.

[0028] The main controller of the high-voltage direct-mounted energy storage system communicates and controls the nine compartment controllers of the high-voltage direct-mounted energy storage system through nine high-speed optical fiber interfaces; the nine compartment controllers of the high-voltage direct-mounted energy storage system are placed in nine separate energy storage containers respectively;

[0029] Each high-voltage direct-mounted energy storage system compartment controller communicates and controls the 20 high-voltage direct-mounted energy storage system unit controllers arranged in the same container through 20 common optical fiber interfaces;

[0030] Each high-voltage direct-mounted energy storage system unit controller completes the wave control and protection of the power unit through the driving device. As a battery management system, the high-voltage direct-mounted energy storage system unit controller manages and protects the battery according to the power unit voltage, current and battery PACK information, including battery remaining power calculation, active and passive balancing strategies, and voltage and current protection strategies.

[0031] Furthermore, the high-speed optical fiber interface and the ordinary optical fiber interface both use a custom communication protocol, which classifies and transmits the communication content in time and segment according to the communication rate requirements, taking into account both the communication rate and the communication capacity;

[0032] Furthermore, the main controller of the high-voltage direct-mounted energy storage system is preset with multiple external RS485, LAN, and CAN communication interfaces for communication and control of the host computer and auxiliary equipment; one of the multiple LAN communication interfaces is connected to the touch screen for human-computer interaction; the operation information of the entire energy storage system can be displayed through the touch screen, and parameters can be issued. Two of the multiple LAN communication interfaces communicate with the host computer energy management system; a dual-network control architecture can be formed to ensure the security of the communication network, and the communication protocol is compatible with TcpModbus, IEC104 and 61850. The main controller of the high-voltage direct-mounted energy storage system is preset with multiple IO interfaces for peripheral control, such as logic processing such as joint trip protection with the upper switch cabinet.

[0033] Furthermore, the main controller of the high-voltage direct-mounted energy storage system can be placed in a separate control compartment or in any one of the nine containers.

[0034] Furthermore, the high-voltage direct-mounted energy storage system compartment controller is preset with multiple external RS485 and CAN communication interfaces for communicating and controlling the cooling system and fire protection system of the energy storage container; the high-voltage direct-mounted energy storage system compartment controller is preset with multiple IO interfaces for controlling peripherals, such as external fault protection signals.

[0035] Furthermore, the high-voltage direct-mounted energy storage system unit controller presets two network ports for data exchange with the battery cluster PACK corresponding to the power unit through a ring topology; the unit controller can collect all information of the battery in this cluster, including but not limited to the battery cell voltage and battery cell temperature, and summarize the battery information to the high-voltage direct-mounted energy storage system master controller through an optical fiber communication link. The high-voltage direct-mounted energy storage system unit controller presets multiple IO interfaces for peripheral control, such as controlling the DC side contactor opening and closing control, and the battery fan heating fan control.

[0036] For the convenience of description, the above embodiment is described by taking the control of a high-voltage direct-mounted energy storage system using 9 containers at 35kV, 25MW, and 50MWh as an example. However, the present invention is not limited to the application of specific capacities and specific containers. As long as the technical features meet the requirements described in the claims of the present invention, they are within the protection scope of the present invention.

[0037] The above-described embodiment only expresses a specific implementation method of the present application, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the attached claims.

Claims

1. A single-unit, large-capacity, multi-container high-voltage direct-mounted energy storage control system, characterized in that: It includes a high-voltage direct-mounted energy storage system master controller, a high-voltage direct-mounted energy storage system compartment controller, and a high-voltage direct-mounted energy storage system unit controller. A high-voltage direct-mounted energy storage system compartment controller is set in each energy storage container; The main controller of the high-voltage direct-mounted energy storage system communicates and controls the multiple compartment controllers of the high-voltage direct-mounted energy storage system through a multi-channel high-speed optical fiber interface; The high-voltage direct-mounted energy storage system compartment controller communicates and controls all high-voltage direct-mounted energy storage system unit controllers in the same container through multiple common optical fiber interfaces; The high-voltage direct-mounted energy storage system unit controller completes the wave control and protection of the power unit through the driving device, and the high-voltage direct-mounted energy storage system unit controller serves as a battery management system to manage the battery according to the power unit voltage, current and battery PACK information.

2. A single-machine, large-capacity, multi-container, high-voltage direct-mounted energy storage control system according to claim 1, characterized in that: The main controller of the high-voltage direct-mounted energy storage system is preset with multiple external RS485, LAN, and CAN communication interfaces for communicating and controlling the host computer and auxiliary equipment; one of the multiple LAN communication interfaces is connected to the touch screen for human-computer interaction; two of the multiple LAN communication interfaces communicate with the host computer energy management system; the main controller of the high-voltage direct-mounted energy storage system is preset with multiple IO interfaces for controlling peripherals.

3. A single-machine, large-capacity, multi-container high-voltage direct-mounted energy storage control system according to claim 1, characterized in that: The high-voltage direct-mounted energy storage system compartment controller is preset with multiple external RS485 and CAN communication interfaces for communicating and controlling the energy storage container cooling system and fire protection system; the high-voltage direct-mounted energy storage system compartment controller is preset with multiple IO interfaces for controlling peripherals.

4. A single-machine, large-capacity, multi-container high-voltage direct-mounted energy storage control system according to claim 1, characterized in that: The high-voltage direct-mounted energy storage system unit controller presets two network ports for data exchange with the battery cluster PACK corresponding to the power unit through a ring topology; the high-voltage direct-mounted energy storage system unit controller presets multiple IO interfaces for peripheral control.

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