Communication system of network construction type energy storage system and power grid management system

Abstract

The utility model relates to the technical field of communication management, and specifically discloses a communication system of a networking type energy storage system and a power grid management system.The communication system of the networking type energy storage system comprises a plurality of energy storage sub-arrays, each energy storage sub-array comprises a plurality of string type energy storage systems, each energy storage sub-array is provided with a first WiFi device, and each energy storage sub-array is provided with a second WiFi device; the adjacent first WiFi devices are wirelessly connected; the optical ring switch is connected with a second WiFi device, and the second WiFi device is electrically connected with all the first WiFi devices; and the power station controller is in communication connection with the optical ring switch through a first Ethernet. WiFi7 is adopted for wireless communication at an energy storage sub-array level, so that high-speed communication is ensured while wiring is reduced; the design of the ring-shaped optical fiber network and the ring-shaped Ethernet is adopted in the energy storage sub-array, so that the system has a redundancy characteristic, stable operation of the system can be ensured, and meanwhile, the system has relatively high anti-interference capability. And the system monitoring unit can perform real-time monitoring and data acquisition on the operation data of each energy storage assembly, so that the system performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to communication management technical field especially relates to a kind of communication system of network type energy storage system and a power grid management system. BACKGROUND

[0002] The synchronous generator set of the mechanical structure of traditional power system is easy to adjust and control, effectively supports the safe and stable operation of power system. Traditional new energy mainly tracks grid voltage and phase through phase-locked loop, and is connected to the grid in the form of current source, but when the power system is disturbed, it does not have the ability to actively provide frequency modulation and voltage support. With the continuous increase of the grid-connected scale of traditional new energy, the short-circuit capacity of power station is reduced, and the support ability of power grid is insufficient, which even brings many risks such as wide-frequency oscillation, voltage fluctuation, stability decline and power quality deterioration to the power grid.

[0003] In order to solve the above technical problems, the technical personnel propose to build an energy storage system to cope with grid fluctuation. According to the different control strategies, it can be mainly divided into two categories: grid-following (GFL) and grid-forming (GFM). Since the grid-following converter is essentially controlled as a current source, its normal operation needs to build a voltage at the grid-connected point by the voltage source in the system. With the large-scale access of new energy generation devices to the grid through the converter, the proportion of synchronous generators in the system gradually decreases, which leads to the continuous decline of the strength of the grid, bringing great challenges to the stable operation of the grid-following converter.

[0004] Therefore, the technical personnel expect to build a grid-forming energy storage system, so it is very important to provide a corresponding stable and reliable communication system. INVENTION CONTENTS

[0005] In order to overcome the above technical problems existing in the prior art, the utility model embodiment provides a kind of communication system of network type energy storage system, through the design of ring optical fiber network and ring Ethernet, system has redundancy characteristics, can quickly recover communication when some node fails, ensure the continuous operation of system.

[0006] In order to achieve the above purpose, the utility model embodiment provides a kind of communication system of network type energy storage system, the communication system of network type energy storage system includes: multiple energy storage subarrays, each energy storage subarray includes multiple group string type energy storage systems, each energy storage subarray is configured with first WiFi device, and adjacent first WiFi devices are wirelessly connected;Optical ring switch is connected with second WiFi device, and the second WiFi device is electrically connected with all first WiFi devices;Power station controller is communicated and connected with the optical ring switch through first Ethernet.

[0007] Preferably, the first WiFi device and the second WiFi device are both WiFi 7 near-field wireless communication devices.

[0008] Preferably, the energy storage subarray includes a subarray controller, each group string energy storage system includes a system monitoring unit and a plurality of battery clusters, the subarray controller is sequentially connected with the corresponding system monitoring unit through a plurality of energy storage converters, each battery cluster includes a battery cluster controller, and the subarray controller, the energy storage converter, the system monitoring unit and the battery cluster controller constitute a second Ethernet.

[0009] Preferably, each battery cluster is connected with the corresponding battery cluster controller through a CAN bus, the battery cluster controllers are sequentially connected in a head-tail manner and connected with the system monitoring unit to form a ring-shaped Ethernet.

[0010] Preferably, the system monitoring units of the plurality of group string energy storage systems of the current energy storage subarray are sequentially connected in a head-tail manner through optical fibers to form a ring-shaped optical fiber network.

[0011] Preferably, each group string energy storage system further includes an energy storage controller, an air conditioner and an alternating current meter, and the system monitoring unit is connected with the energy storage controller, the air conditioner and the alternating current meter through an RS485 communication bus.

[0012] Preferably, each energy storage subarray further includes an energy storage box transformer, and the subarray controller is connected with the energy storage box transformer through an RS485 communication bus.

[0013] Correspondingly, the utility model also provides a power grid management system, the power grid management system includes the communication system of the network type energy storage system according to any one of the utility model embodiment, the communication system of the network type energy storage system includes power station controller, the power grid management system further includes energy management system and supervisory control and data acquisition system, and the energy management system and supervisory control and data acquisition system are connected with the power station controller through Ethernet.

[0014] Through the technical scheme provided by the utility model, the utility model has at least the following technical effects:

[0015] The WiFi 7 near-field wireless communication device and the Ethernet technology are adopted, so that the efficient data transmission between each energy storage subarray in the system is ensured, and the communication rate and stability are improved. Through the design of the ring-shaped optical fiber network and the ring-shaped Ethernet, the system has the redundancy characteristic, can quickly recover communication when a node fails, and ensures the continuous operation of the system. The connection of the system monitoring unit and each energy storage component can realize the real-time monitoring and data acquisition of the operation data of each energy storage component, and improves the overall performance of the energy storage system.

[0016] Other features and advantages of the embodiments of the present application will be described in detail in the following detailed description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the embodiments of the present application together with the following detailed description, but do not constitute a limitation of the embodiments of the present application. In the drawings:

[0018] Figure 1 is a communication system structure diagram of a network construction type energy storage system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0019] The specific embodiments of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application.

[0020] The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" means two or more, and therefore, "multiple" in the embodiments of the present application can also be understood as "at least two". "And / or", which describes the association relationship of the associated objects, means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / ", if not specially stated, generally represents that the associated objects before and after are in an "or" relationship. In addition, it should be understood that in the description of the embodiments of the present application, the terms "first", "second", etc. are only used for distinguishing purposes of description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0021] Please refer to Figure 1 The embodiments of the present application provide a communication system of a network construction type energy storage system, the communication system of the network construction type energy storage system comprises: a plurality of energy storage sub-arrays, each energy storage sub-array comprises a plurality of group string type energy storage systems, each energy storage sub-array is configured with a first WiFi device, and adjacent first WiFi devices are wirelessly connected; an optical ring switch is connected with a second WiFi device, the second WiFi device is electrically connected with all the first WiFi devices; and a power station controller is in communication connection with the optical ring switch through a first Ethernet.

[0022] Preferably, the first WiFi device and the second WiFi device are both WiFi 7 near field wireless communication devices.

[0023] In a possible embodiment, the network-constructing energy storage system provided in the embodiment of the utility model is composed of a plurality of sub-arrays (such as energy storage sub-array 1 to energy storage sub-array 9), each sub-array contains group string energy storage system 1 to group string energy storage system 5. Further, each energy storage sub-array is provided with a first WiFi device, and these devices are wirelessly connected between adjacent energy storage sub-arrays, thereby forming a wireless communication network on the basis of greatly reducing wiring, facilitating fast data transmission and real-time monitoring. Further, the optical ring switch is the central node of the system, which is connected with the second WiFi device, and at the same time, the second WiFi device is electrically connected with the first WiFi device, thereby improving the communication reliability while avoiding the failure of the entire communication system caused by the abnormality of any communication node in the wired connection mode. Further, the power station controller is in communication connection with the optical ring switch through the first Ethernet, wherein the power station controller is used for coordinating and managing each part of the power station. Through the stable connection of the Ethernet, the power station controller can receive data from the optical ring switch in real time, and perform system regulation and control according to the data, thereby ensuring the stable operation and optimized performance of the energy storage system.

[0024] Further, the first WiFi device and the second WiFi device are both WiFi 7 near-field wireless communication devices. WiFi 7 supports a maximum bandwidth of 320MHz, thereby providing the network-constructing energy storage system with fast transmission rate, response speed and processing capacity. At the same time, WiFi 7 can reduce the time delay to below 5ms, thereby ensuring the timeliness and accuracy of the system.

[0025] The wireless connection mode makes the increase or removal of the energy storage sub-array more flexible, thereby facilitating the expansion and upgrading of the system. The centralized management function of the optical ring switch enables the power station controller to more effectively monitor and control the entire energy storage system, thereby improving the operation efficiency and reliability of the system.

[0026] In the embodiment of the utility model, the energy storage sub-array includes a sub-array controller, each group string energy storage system includes a system monitoring unit and a plurality of battery clusters, the sub-array controller is electrically connected with the corresponding system monitoring unit through a plurality of energy storage converters in turn, each battery cluster includes a battery cluster controller, and the sub-array controller, the energy storage converter, the system monitoring unit and the battery cluster controller build a second Ethernet.

[0027] In a possible implementation, each energy storage sub-array contains a sub-array controller, which is specially responsible for monitoring and managing the operation state of the devices under its jurisdiction, thereby realizing more refined management. Each energy storage sub-array is composed of a plurality of parallelly connected group string energy storage systems (such as group string energy storage system 1 to group string energy storage system 5), and the refined management of a single energy storage unit can be realized by setting a plurality of individual group string energy storage systems, thereby improving the efficiency and reliability of the entire system.

[0028] Further, each group string energy storage system includes a system monitoring unit and multiple battery clusters. The subarray controller is electrically connected to the corresponding system monitoring unit through multiple energy storage converters. Through the monitoring of the battery clusters by the subarray controller, abnormal conditions of the battery clusters, such as overheating and overcharging, can be detected in a timely manner, thereby improving the safety of the entire energy storage system. Each battery cluster includes a battery cluster controller, and the subarray controller, the energy storage converter, the system monitoring unit, and the battery cluster controller form a second Ethernet network to achieve high-speed data transmission and real-time monitoring. Through the direct connection between the subarray controller, the energy storage converter, the system monitoring unit, and the battery cluster controller, the speed and accuracy of data transmission are improved, further improving the efficiency and reliability of the entire energy storage system. At the same time, the construction of the second Ethernet network provides a stable communication platform with sufficient electromagnetic interference capability to ensure stable data transmission.

[0029] In the embodiments of the present application, each battery cluster is connected to the corresponding battery cluster controller through CAN bus communication, and the battery cluster controllers are connected in sequence and connected to the system monitoring unit to form a ring-shaped Ethernet network.

[0030] In a possible implementation, in a battery management system, the battery clusters are connected to their corresponding battery cluster controllers through CAN bus communication to achieve the effect of quickly responding to changes in battery status and ensure the safe operation of the battery clusters. Further, the battery cluster controllers are connected in sequence and connected to the system monitoring unit to form a ring-shaped Ethernet network to ensure efficient communication between internal devices of the subarray, which is conducive to real-time monitoring and rapid response. By constructing a ring-shaped Ethernet network, the system can achieve data communication redundancy and improve communication reliability. If any link in the ring-shaped Ethernet network fails, data can still be transmitted through other paths, ensuring continuous operation of the system.

[0031] In the embodiments of the present application, the system monitoring units of the multiple group string energy storage systems of the current energy storage subarray are connected in sequence through optical fibers to form a ring-shaped optical fiber network.

[0032] In a possible implementation, in the communication system of a networked energy storage system, the system monitoring units of each energy storage subarray are connected in sequence through optical fibers to form a ring-shaped optical fiber network. The ring network structure provides communication redundancy. If a node in the network fails, data can still be transmitted through other paths in the ring network, thereby ensuring the continuity of communication and the stability of the system.

[0033] In the embodiment of the utility model, each group string type energy storage system further includes energy storage controller, air conditioner and AC meter, the system monitoring unit is connected with the energy storage controller, the air conditioner and the AC meter through RS485 communication bus.

[0034] In a possible implementation, the group string type energy storage system further includes energy storage controller, air conditioner and AC meter, wherein the energy storage controller serves as the core of the energy storage system, is responsible for monitoring and managing the battery charging and discharging process, the air conditioner plays a role of thermal management in the energy storage system, ensures the normal operation of the battery pack and the supporting electrical equipment by controlling the temperature in the container, and the AC meter is used for measuring the exchanged electric energy between the energy storage system and the power grid, and the data of the AC meter can also be used for monitoring the operation state of the energy storage system. Further, the system monitoring unit is connected with the energy storage controller, the air conditioner and the AC meter through RS485 communication bus, so as to realize centralized monitoring and management of data and improve the operation efficiency of the energy storage system.

[0035] In the embodiment of the utility model, each energy storage subarray further includes energy storage transformer, and the subarray controller is connected with the energy storage transformer through RS485 communication bus.

[0036] In a possible implementation, the energy storage transformer is used for converting the direct current of the energy storage battery into alternating current for use of the power grid or grid connection. The subarray controller is connected with the energy storage transformer through RS485 communication bus. This connection mode allows the subarray controller to monitor and manage the energy storage transformer and realize bidirectional transmission of data. At the same time, the subarray controller can monitor the working state of the energy storage transformer in real time through the RS485 communication bus, discover and handle potential faults in time, reduce the risk of system operation, and improve the safety of the entire energy storage system.

[0037] Further, the utility model embodiment also provides a power grid management system, the power grid management system includes the communication system of the network type energy storage system according to any one of the utility model embodiments, the communication system of the network type energy storage system includes power station controller, the power grid management system further includes energy management system and supervisory control and data acquisition system, and the energy management system and the supervisory control and data acquisition system are connected with the power station controller through Ethernet.

[0038] The optional implementation of the embodiment of the utility model is described in detail above in combination with the drawings, but the embodiment of the utility model is not limited to the specific details in the above implementation, and various simple modifications can be made to the technical scheme of the embodiment of the utility model within the technical concept range of the embodiment of the utility model, and these simple modifications all belong to the protection range of the embodiment of the utility model.

[0039] In addition, it should be noted that various technical features described in the above embodiments can be combined in any suitable manner, as long as there is no contradiction. In order to avoid unnecessary repetition, various possible combinations of the embodiments of the present application are not described again.

[0040] In addition, various different embodiments of the present application can be combined in any suitable manner, as long as they do not deviate from the spirit of the present application. They should also be considered as disclosed by the present application.

Claims

1. A communication system for a grid-type energy storage system, characterized in that, The communication system of the grid-type energy storage system includes: Multiple energy storage subarrays, each energy storage subarray includes multiple string energy storage systems, each energy storage subarray is equipped with a first WiFi device, and adjacent first WiFi devices are wirelessly connected; A ring switch is connected to a second WiFi device, which is electrically connected to all first WiFi devices. The power station controller communicates with the optical ring switch via a first Ethernet.

2. The communication system of the grid-type energy storage system according to claim 1, characterized in that, Both the first WiFi device and the second WiFi device are WiFi 7 near-field wireless communication devices.

3. The communication system of the grid-type energy storage system according to claim 1, characterized in that, The energy storage subarray includes a subarray controller. Each string energy storage system includes a system monitoring unit and multiple battery clusters. The subarray controller is electrically connected to the corresponding system monitoring unit in sequence through multiple energy storage converters. Each battery cluster includes a battery cluster controller. The subarray controller, the energy storage converter, the system monitoring unit, and the battery cluster controller form a second Ethernet network.

4. The communication system of the grid-type energy storage system according to claim 3, characterized in that, Each battery cluster is connected to its corresponding battery cluster controller via a CAN bus. The battery cluster controllers are connected sequentially end to end and connected to the system monitoring unit to form a ring Ethernet.

5. The communication system of the grid-type energy storage system according to claim 3, characterized in that, The system monitoring units of multiple string energy storage systems in the current energy storage subarray are connected end to end by optical fibers to form a ring optical fiber network.

6. The communication system of the grid-type energy storage system according to claim 3, characterized in that, Each of the string energy storage systems further includes an energy storage controller, an air conditioner, and an AC meter. The system monitoring unit is electrically connected to the energy storage controller, the air conditioner, and the AC meter via an RS485 communication bus.

7. The communication system of the grid-type energy storage system according to claim 3, characterized in that, Each energy storage subarray also includes an energy storage transformer, and the subarray controller is electrically connected to the energy storage transformer via an RS485 communication bus.

8. A power grid management system, characterized in that, The power grid management system includes a communication system for the grid-type energy storage system according to any one of claims 1-7. The communication system of the grid-type energy storage system includes a power station controller. The power grid management system also includes an energy management system and a monitoring and data acquisition system. The energy management system and the monitoring and data acquisition system are connected to the power station controller via Ethernet.

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