An energy storage system

Abstract

The application relates to the new energy storage technology field and discloses a kind of energy storage systems, including sequentially communicating and connecting process layer, interval layer, station control layer.Process layer includes a plurality of parallel energy storage subunits, and the energy storage subunit includes a direct current control cabinet, AC side, interval layer includes optical fiber distribution frame, interval optical-electric conversion module, interval layer data network switch, station control layer includes EMS server, station control layer data network switch, operator workstation; a plurality of energy storage subunits are connected in parallel through optical fiber distribution frame, process layer, optical fiber distribution frame, interval optical-electric conversion module, interval layer data network switch, EMS server, station control layer data network switch are sequentially communicated and connected, and interval layer data network switch is communicated and connected with operator workstation.The application solves the problems of low reliability and low stability in the prior art.

Description

Technical Field

[0001] This invention relates to the field of new energy storage technology, specifically an energy storage system. Background Technology

[0002] An energy storage system is a system that stores energy, such as electrical energy, through various media and releases it when needed. The two main components of an energy storage system are energy storage devices composed of energy storage elements and grid connection devices composed of power electronic devices. Energy storage devices primarily realize the storage, release, or rapid power exchange of energy. Grid connection devices enable bidirectional energy transfer and conversion between the energy storage devices and the power grid, achieving functions such as peak shaving, energy optimization, improved power supply reliability, and power system stability.

[0003] With the changing global energy structure, large-scale centralized energy storage power stations are being constructed on a massive scale. Large and ultra-large centralized energy storage power stations are mostly built in open, arid regions, such as Gobi deserts, tidal flats, islands, and barren hills—places unsuitable for agricultural growth but rich in solar energy resources. Because energy storage power stations need to be connected to ultra-large power grids, there are certain performance requirements for the energy management system and the communication architecture of the energy storage system. Therefore, the energy management system and the communication architecture of the energy storage system are crucial components for the charging and discharging operation of the entire power station, as well as remote control and data scheduling.

[0004] However, existing traditional large-scale energy storage power stations suffer from instability and data packet loss in their energy management and conventional communication, which affect system operation and make it difficult to effectively guarantee the communication reliability, real-time performance, and operational safety of battery energy storage power stations. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an energy storage system that solves problems such as low reliability and low stability.

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

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

[0008] As a preferred technical solution, the process layer includes several parallel energy storage sub-units, each of which includes a DC control cabinet and an AC side connected in communication. The bay layer includes fiber optic distribution frames, bay photoelectric conversion modules, and bay layer data network switches. The station control layer includes an EMS server, a station control layer data network switch, and an operator workstation. The several energy storage sub-units are connected in parallel via fiber optic distribution frames. The process layer, fiber optic distribution frames, bay photoelectric conversion modules, bay layer data network switches, EMS server, and station control layer data network switches are sequentially connected in communication. The bay layer data network switches are also 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, a local EMS, an IOT module, a BMS, and a BCU that are respectively connected to the local switch. The IOT module is connected to the BMS, the BMS is connected to the BCU, and the process photoelectric conversion module is connected to the fiber optic distribution frame.

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

[0011] As a preferred technical solution, the BMS and BCU are connected via a CAN bus.

[0012] As a preferred technical solution, the IOT module communicates with one or more of the following via RS485 using the ModBusRTU communication protocol: a water immersion sensor, a fault signal unit, an air conditioner, a fire protection unit, a temperature and humidity sensor, and an electricity meter.

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

[0014] As a preferred technical solution, the process layer data network switch is connected to the PCS, the transformer substation measurement and control unit, and the water cooling system via RS485 using the ModBusRTU communication protocol. The control network switch is also connected to the PCS, the transformer substation 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 BMS are connected via a CAN bus for communication.

[0016] As a preferred technical solution, there are two sets of process photoelectric conversion modules, two sets of interval photoelectric conversion modules, and two sets of EMS servers. There are also two sets of interval layer data network switches and two sets of station control layer data network switches. One set of process photoelectric conversion modules, fiber optic distribution frame, one set of interval photoelectric conversion modules, one interval layer data network switch, one set of EMS servers, and one station control layer data network switch are connected in sequence to form the main communication path. The other set of process photoelectric conversion modules, fiber optic distribution frame, another set of interval photoelectric conversion modules, one interval layer data network switch, another set of EMS servers, and one station control layer data network switch are connected in sequence to form the backup communication path. Both interval layer data network switches are connected to the operator workstation.

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

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

[0019] (2) The three-layer two-network communication architecture of the present invention is better suited for the networking mode, communication protocol, data transmission, network outage response, etc. of battery energy storage power station, effectively ensuring the communication reliability, real-time performance and operational safety of battery energy storage power station. Attached Figure Description

[0020] Figure 1 This is 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 magnified views of a section;

[0022] Figure 3 for Figure 1 The second enlarged view of a section;

[0023] Figure 4 for Figure 1 The third enlarged view of a section;

[0024] Figure 5 for Figure 1 Part 4 of the enlarged view;

[0025] Figure 6 This is a control flowchart of an energy storage system according to the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the embodiments and accompanying 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 a three-layer two-network structure for the communication architecture of the energy management system and the energy storage system, including a process layer, an interval layer and a station control layer that are connected in sequence. The process layer includes several energy storage sub-units, which 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 integrating hardware and software, used to monitor, control, and optimize energy flow and consumption in energy systems. Based on data acquisition, analysis, and decision support technologies, it can monitor the operating status of energy equipment, energy consumption, and environmental conditions in real time, thereby achieving efficient energy management and optimization.

[0030] The communication architecture of an energy storage system is the lifeblood of a power station's data and control system. It links the devices and modules within and between the station control layer, bay layer, and process layer to form a complete energy storage system. The station control layer includes equipment such as EMS server main / backup and data server main / backup; the bay layer includes equipment such as switches and photoelectric conversion modules; and the process layer includes equipment such as PCS, BMS, transformer substation monitoring and control, and water-cooling system I / O interface devices. All layers are connected via a communication network.

[0031] The three-layer, two-network communication architecture is better suited for the networking methods, communication protocols, data transmission, and network outage response of battery energy storage power stations, effectively ensuring the communication reliability, real-time performance, and operational safety of battery energy storage power stations.

[0032] The system:

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

[0034] The energy management system consists of a local EMS at the process layer and a primary and backup server at the station control layer. It accepts energy dispatch from the central station and controls each local energy storage sub-unit in real time.

[0035] Within the process layer, within an energy storage sub-unit, the IOT module communicates with devices such as air conditioners (1-n), fire protection (1-n), temperature and humidity sensors, and electricity meters via RS485 using the ModBusRTU communication protocol.

[0036] Within the process layer, within an energy storage sub-unit, the energy storage converter (PCS) communicates with the battery clusters 1-n (BMS level 3) via a CAN bus. The BMS sends some data and commands such as charge / discharge prohibition to the energy storage converter.

[0037] Within the process layer, each energy storage subunit has a process layer data network switch and a control network switch that are connected to devices (PCS, transformer substation monitoring and control, water cooling system) via network cables for communication, using ModBusTCP for communication;

[0038] Within the process layer, in an energy storage subunit, there is a local EMS connected to a switch via a network cable to interact with and control various devices (BMS, PCS, transformer substation monitoring and control, water cooling system);

[0039] Between the process layer and the bay layer, the local EMS in an energy storage sub-unit converts the data into optical links through two photoelectric conversion modules and sends it 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 primary and backup servers of the station control layer are also connected to the A″ and B″ networks (power station data network) of the main power station via network cables through the A′ and B′ network switches (station control layer data network switches);

[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 IEC 61850.

[0042] IEC 61850 is a new industrial network technology based on TCP / IP, featuring high transmission rates, support for multiple network protocols, dynamic network configuration, and security. The IEC 61850 protocol offers rich functions and services, including real-time data acquisition, remote control commands, event logging, and alarm processing. 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 power system monitoring, protection, and control. It provides a unified communication standard, reducing the complexity of integration between devices and improving system reliability and interoperability.

[0043] This invention solves the problems of instability and data packet loss in energy management and conventional communication that affect the operation of existing traditional large-scale energy storage power stations.

[0044] The three-layer, two-network communication architecture of this invention is better suited for the networking methods, communication protocols, data transmission, and network outage response of battery energy storage power stations, effectively ensuring the communication reliability, real-time performance, and operational safety of battery energy storage power stations.

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

[0046] All features disclosed in all embodiments of this specification, or steps in all methods or processes implied in the disclosure, may be combined and / or extended or replaced in any way, except for mutually exclusive features and / or steps.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An energy storage system, characterized in that, This includes the process layer, interval layer, and station control layer, which are connected in sequence through communication. The process layer includes several parallel energy storage sub-units. Each energy storage sub-unit includes a DC control cabinet and an AC side connected by communication. The DC control cabinet includes a process photoelectric conversion module and a local switch. The AC side includes a process layer data network switch and a control network switch. The process layer data network switch is connected to the PCS, the transformer substation measurement and control unit, and the water cooling system, respectively. The control network switch is connected to the PCS, the transformer substation measurement and control unit, and the water cooling system, respectively. The bay layer includes fiber optic distribution frames, bay optoelectronic conversion modules, and bay layer data network switches; The station control layer includes EMS servers, station control layer data network switches, and operator workstations; Several energy storage sub-units are connected in parallel via fiber optic distribution frames. The process photoelectric conversion module, fiber optic distribution frame, bay photoelectric conversion module, bay layer data network switch, EMS server, and station control layer data network switch are connected in sequence for communication. The bay layer data network switch is connected to the operator workstation for communication. There are two sets of process photoelectric conversion modules, two sets of interval photoelectric conversion modules, and two sets of EMS servers. There are two sets of interval layer data network switches and two sets of station control layer data network switches. One set of process photoelectric conversion modules, fiber optic distribution frame, one set of interval photoelectric conversion modules, one set of interval layer data network switches, one set of EMS servers, and one set of station control layer data network switches are connected in sequence to form the main communication path. The other set of process photoelectric conversion modules, fiber optic distribution frame, another set of interval photoelectric conversion modules, one set of interval layer data network switches, another set of EMS servers, and one set of station control layer data network switches are connected in sequence to form the backup communication path. Both interval layer data network switches are connected to the operator workstation.

2. The energy storage system according to claim 1, characterized in that, The DC control cabinet includes a process photoelectric conversion module, a local switch, and local EMS, IOT module, BMS, and BCU that are respectively connected to the local switch. The IOT module is connected to the BMS, the BMS is connected to the BCU, and the process photoelectric conversion module is connected to the fiber optic distribution frame.

3. The energy storage system according to claim 2, characterized in that, The IoT module and BMS communicate via RS485 using the ModBusRTU communication protocol.

4. An energy storage system according to claim 3, characterized in that, The BMS and BCU are connected via a CAN bus.

5. An energy storage system according to claim 2, characterized in that, The IoT module communicates via RS485 using the ModBusRTU communication protocol and is connected to one or more of the following: a water immersion sensor, a fault signal unit, an air conditioner, a fire protection unit, a temperature and humidity sensor, and an electricity meter.

6. An energy storage system according to claim 1, characterized in that, The process layer data network switch is connected to the PCS, the transformer substation measurement and control unit, and the water cooling system via RS485 using the ModBusRTU communication protocol. The control network switch is also connected to the PCS, the transformer substation measurement and control unit, and the water cooling system via RS485 using the ModBusRTU communication protocol.

7. An energy storage system according to claim 1, characterized in that, The PCS and BMS are connected via a CAN bus.

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