Energy storage system

Abstract

The invention relates to the technical field of new energy storage, and discloses an energy storage system which comprises a process layer, a spacing layer and a station control layer which are in communication connection in sequence. The process layer comprises a plurality of energy storage subunits which are connected in parallel, each energy storage subunit comprises a direct current control cabinet and an alternating current side which are in communication connection, the spacing layer comprises an optical fiber distribution frame, a spacing photoelectric conversion module and a spacing layer data network switch, and the station control layer comprises an EMS server, a station control layer data network switch and an operator workstation. The plurality of energy storage subunits are connected in parallel through the optical fiber distribution frame, the process layer, the optical fiber distribution frame, the interval photoelectric conversion module, the interval layer data network switch, the EMS server and the station control layer data network switch are sequentially in communication connection, and the interval layer data network switch is in communication connection with the operator work station. The problems of low reliability, low stability and the like in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy storage technology, in particular to an energy storage system. Background Art

[0002] Energy storage system refers to a system that stores energy in the form of electricity through different media and releases it when needed. The energy storage device composed of energy storage elements and the grid access device composed of power electronic devices are the two major parts of the energy storage system. The energy storage device is important for realizing energy storage, release or rapid power exchange. The grid access device realizes the two-way transmission and conversion of energy between the energy storage device and the power grid, and realizes functions such as power peak regulation, energy optimization, and improving power supply reliability and power system stability.

[0003] With the changes in the global energy structure, large-scale centralized energy storage power stations are being built on a large scale. Large and ultra-large centralized energy storage power stations are mostly built in desert open areas, such as Gobi sand, tidal flats, islands, and barren hills where crops cannot grow but where solar energy resources are abundant. Since energy storage power stations need to be connected to ultra-large power grids, there are certain index requirements for the energy management system and energy storage system communication architecture. Therefore, the energy management system and energy storage system communication frame are very important for the charging and discharging operation of the entire power station, as well as remote control and data scheduling.

[0004] However, the energy management and conventional communications of existing traditional large-scale energy storage power stations have problems such as instability and data packet loss that affect system operation, making it difficult to effectively ensure the communication reliability, real-time performance, and operational safety of battery energy storage power stations. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an energy storage system to solve the problems of low reliability, low stability, etc. in the prior art.

[0006] The technical solution adopted by the present invention to solve the above problems is:

[0007] An energy storage system includes a process layer, an interval layer, and a station control layer which are sequentially connected in communication.

[0008] As a preferred technical solution, the process layer includes several energy storage sub-units connected in parallel, the energy storage sub-units include a DC control cabinet and an AC side connected in communication, the interval layer includes a fiber optic distribution frame, an interval photoelectric conversion module, and an interval layer data network switch, and the station control layer includes an EMS server, a station control layer data network switch, and an operator workstation; several energy storage sub-units are connected in parallel through the fiber optic distribution frame, the process layer, the fiber optic distribution frame, the interval photoelectric conversion module, the interval layer data network switch, the EMS server, and the station control layer data network switch are connected in communication in sequence, and the interval layer data network switch is connected in communication with the operator workstation.

[0009] As a preferred technical solution, the DC control cabinet includes a process photoelectric conversion module, a local switch, and a local EMS, an IOT module, a BMS, and a BCU which are respectively connected to the local switch for communication. The IOT module is connected to the BMS for communication, the BMS is connected to the BCU for communication, and the process photoelectric conversion module is connected to the optical fiber distribution frame for communication.

[0010] As a preferred technical solution, the IOT module is connected to the BMS via RS485 using the ModBusRTU communication protocol.

[0011] As a preferred technical solution, the BMS is connected to the BCU via CAN bus communication.

[0012] As a preferred technical solution, the IOT module is connected to one or more of a water immersion sensor, a fault signal unit, an air conditioner, a fire unit, a temperature and humidity sensor, and an electric energy meter using the ModBusRTU communication protocol via RS485.

[0013] As a preferred technical solution, the AC side includes a process layer data network switch, a control network switch, a PCS, a box transformer measurement and control unit, and a water cooling system. The process layer data network switch is communicatively connected with the PCS, the box transformer measurement and control unit, and the water cooling system respectively. The control network switch is communicatively connected with the PCS, the box transformer measurement and control unit, and the water cooling system respectively. The process layer data network switch is communicatively connected with the local switch and the local EMS respectively. The PCS is communicatively connected with the BMS.

[0014] As a preferred technical solution, the process layer data network switch is connected to the PCS, the box transformer measurement and control unit, and the water cooling system via RS485 using the ModBusRTU communication protocol, and the control network switch is connected to the PCS, the box transformer measurement and control unit, and the water cooling system via RS485 using the ModBusRTU communication protocol.

[0015] As a preferred technical solution, the PCS and the BMS are connected via CAN bus communication.

[0016] As a preferred technical solution, the number of process optoelectronic conversion modules, interval optoelectronic conversion modules, and EMS servers are all two groups, and the number of interval layer data network switches and station control layer data network switches are both two. One group of process optoelectronic conversion modules, optical fiber distribution frames, a group of interval optoelectronic conversion modules, an interval layer data network switch, a group of EMS servers, and a station control layer data network switch are connected in communication in sequence to form a main communication path, and another group of process optoelectronic conversion modules, optical fiber distribution frames, another group of interval optoelectronic conversion modules, an interval layer data network switch, another group of EMS servers, and a station control layer data network switch are connected in communication in sequence to form a backup communication path, and both interval layer data network switches are connected to the operator workstation for communication.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention solves the problems of energy management of existing traditional large-scale energy storage power stations and conventional communication, such as instability and data packet loss, which affect system operation;

[0019] (2) The three-layer two-network communication architecture of the present invention is better used for the networking mode, communication protocol, data transmission, network disconnection response, etc. of the battery energy storage power station, effectively ensuring the communication reliability, real-time performance, and operation safety of the battery energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an energy storage system according to the present invention;

[0021] Figure 2 for Figure 1 One of the partial enlarged pictures;

[0022] Figure 3 for Figure 1 The second partial enlarged picture;

[0023] Figure 4 for Figure 1 The third partial enlarged picture;

[0024] Figure 5 for Figure 1 The fourth partial enlarged picture;

[0025] Figure 6 This is a control flow chart of an energy storage system described in the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0027] Example 1

[0028] like Figures 1 to 6 As shown, in order to solve the problems of the prior art, the present invention provides an energy management system and energy storage system communication architecture with a three-layer two-network structure, including a process layer, an interval layer, and a station control layer that are connected in communication in sequence, and the process layer includes a number of energy storage sub-units, and the energy storage sub-units include: PCS (Power Conversion System), BMS (Battery Management System), EMS (Energy Management System), various servers and other equipment and modules.

[0029] EMS is an intelligent system that integrates software and hardware to monitor, control and optimize energy flow and energy consumption in energy systems. Based on data collection, analysis and decision support technology, it can monitor the operating status of energy equipment, energy consumption and environmental conditions in real time, thereby achieving efficient management and optimization of energy.

[0030] The energy storage system communication architecture is the main artery of data and control of an energy storage power station, linking the equipment and modules in and between the station control layer, interval layer, and process layer of the energy storage power station to form a complete energy storage system power station. The station control layer includes equipment such as EMS server master / slave and data server master / slave; the interval layer includes equipment such as switches and photoelectric conversion modules; the process layer includes equipment such as PCS, BMS, box transformer measurement and control, and water cooling system IO interface equipment. Each layer is connected through a communication network.

[0031] The three-layer two-network communication architecture is better used for the networking mode, communication protocol, data transmission, network disconnection response, etc. of the battery energy storage power station, effectively ensuring the communication reliability, real-time performance, and operational safety of the battery energy storage power station.

[0032] The system:

[0033] In the energy storage subunit, the energy storage converter (PCS) and the battery cluster (BMS level 3) communicate via the CAN bus, the BMS (level 3) and the BMS (level 2) communicate via the CAN bus, the IOT (input and output, InpuT and outpuT) module communicates with the air conditioning, fire protection and other equipment via RS485 using the ModBusRTU communication protocol, and some signals are connected through active or passive dry contacts;

[0034] The energy management system consists of the local EMS at the process layer and the main and standby servers at the station control layer, which accept the energy dispatch of the main station and the real-time control of each local energy storage sub-unit;

[0035] In the process layer, in an energy storage subunit, the IOT module communicates with the air conditioner (1-n), fire protection (1-n), temperature and humidity sensor, electric energy meter and other equipment through RS485 using ModBusRTU communication protocol;

[0036] In the process layer, in an energy storage subunit, the energy storage converter (PCS) communicates with the battery cluster 1-n (BMS level 3) via the CAN bus, and the BMS sends some data and charging and discharging prohibition instructions to the energy storage converter;

[0037] In the process layer, in an energy storage subunit, there are process layer data network switches and control network switches that connect devices (PCS, box-type transformer measurement and control, water cooling system) through network cables for communication, using ModBusTCP for communication;

[0038] In the process layer, in an energy storage subunit, there is a local EMS that connects to the switch through a network cable to exchange data and control with various devices (BMS, PCS, box-type transformer measurement and control, water cooling system);

[0039] Between the process layer and the bay layer, the local EMS in an energy storage subunit converts data into optical links through two photoelectric conversion modules and sends them to the bay layer. The A network and B network switches (bay layer data network switches) of the bay layer transmit the data to the corresponding main server and backup server of the station control layer and the operator workstation respectively.

[0040] The main and backup servers of the station control layer are also connected to the A″ network and B″ network (the data network of the main power station) of the power station through the A′ network and B′ network switches (the data network switches of the station control layer) through network cables;

[0041] From the process layer to the bay layer and from the bay layer to the station control layer, all connections via network cables follow the communication protocol of the IEC 61850 protocol for communication;

[0042] IEC 61850 is a new industrial network technology based on TCP / IP. It has the advantages of high transmission rate, support for multiple network protocols, support for dynamic network configuration, support for security, etc. The IEC 61850 protocol provides rich functions and services, including real-time data acquisition, remote control commands, event recording, alarm processing, etc. It supports flexible configuration and expansion to meet the needs of different application scenarios. The IEC 61850 protocol has a wide range of applications, including monitoring, protection and control of power systems. It provides a unified communication standard, reduces the integration complexity between devices, and improves the reliability and interoperability of the system.

[0043] The present invention solves the problems of energy management of existing traditional large-scale energy storage power stations and the instability of conventional communications, data packet loss and other issues that affect system operation.

[0044] The communication architecture of the three-layer two-network structure of the present invention is better used for the networking mode, communication protocol, data transmission, network disconnection response, etc. of the battery energy storage power station, effectively ensuring the communication reliability, real-time performance, and operation safety of the battery energy storage power station.

[0045] As described above, the present invention can be preferably implemented.

[0046] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. An energy storage system, characterized in that: It includes a process layer, an interval layer, and a station control layer which are connected in sequence by communication.

2. An energy storage system according to claim 1, characterized in that: The process layer includes several energy storage sub-units connected in parallel, and the energy storage sub-unit includes a DC control cabinet and an AC side connected in communication. The interval layer includes a fiber optic distribution frame, an interval photoelectric conversion module, and an interval layer data network switch. The station control layer includes an EMS server, a station control layer data network switch, and an operator workstation. Several energy storage sub-units are connected in parallel through the fiber optic distribution frame, and the process layer, the fiber optic distribution frame, the interval photoelectric conversion module, the interval layer data network switch, the EMS server, and the station control layer data network switch are connected in communication in sequence, and the interval layer data network switch is connected in communication with the operator workstation.

3. An energy storage system according to claim 2, characterized in that: The DC control cabinet includes a process photoelectric conversion module, a local switch, and a local EMS, an IOT module, a BMS, and a BCU which are respectively connected to the local switch for communication. The IOT module is connected to the BMS for communication, the BMS is connected to the BCU for communication, and the process photoelectric conversion module is connected to the optical fiber distribution frame for communication.

4. An energy storage system according to claim 3, characterized in that: The IOT module is connected to the BMS via RS485 using the ModBusRTU communication protocol.

5. An energy storage system according to claim 4, characterized in that: BMS and BCU are connected via CAN bus communication.

6. An energy storage system according to claim 3, characterized in that: The IOT module communicates with one or more of a water immersion sensor, a fault signal unit, an air conditioner, a fire unit, a temperature and humidity sensor, and an electric energy meter through RS485 using the ModBusRTU communication protocol.

7. An energy storage system according to any one of claims 3 to 6, characterized in that: The AC side includes a process layer data network switch, a control network switch, a PCS, a box-type transformer measurement and control unit, and a water cooling system. The process layer data network switch is connected to the PCS, the box-type transformer measurement and control unit, and the water cooling system through communication. The control network switch is connected to the PCS, the box-type transformer measurement and control unit, and the water cooling system through protocol communication. The process layer data network switch is connected to the local switch and the local EMS through communication. The PCS is connected to the BMS through communication.

8. An energy storage system according to claim 7, characterized in that: The process layer data network switch is connected to the PCS, the box-type transformer measurement and control unit, and the water cooling system through RS485 using the ModBusRTU communication protocol. The control network switch is connected to the PCS, the box-type transformer measurement and control unit, and the water cooling system through RS485 using the ModBusRTU communication protocol.

9. An energy storage system according to claim 7, characterized in that: PCS and BMS are connected via CAN bus communication.

10. An energy storage system according to claim 7, characterized in that: There are two groups of process photoelectric conversion modules, interval photoelectric conversion modules, and EMS servers, and two groups of interval layer data network switches and station control layer data network switches. One group of process photoelectric conversion modules, optical fiber distribution frames, one group of interval photoelectric conversion modules, one interval layer data network switch, one group of EMS servers, and one station control layer data network switch are connected in communication in sequence to form a main communication path. Another group of process photoelectric conversion modules, optical fiber distribution frames, another group of interval photoelectric conversion modules, one interval layer data network switch, another group of EMS servers, and one station control layer data network switch are connected in communication in sequence to form a backup communication path. Both interval layer data network switches are connected to the operator workstation for communication.

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