Communication topology architecture for off-network no-network energy storage system

Abstract

The utility model discloses a communication topology architecture for an off-network no-network energy storage system. The communication topology architecture comprises a battery cluster or a plurality of battery clusters, a PCS, a DCDC and an EMS. The battery cluster is formed by connecting a plurality of battery boxes and a high-voltage control box in series, the first-stage BMS of each battery box in the battery cluster is connected to the second-stage BMS in the high-voltage control box in the battery cluster in a daisy chain communication mode, and when the battery cluster is unique, the PCS and the second-stage BMS communicate through a CAN bus; when a plurality of battery clusters exist, the second-stage BMS and the third-stage BMS of each battery cluster communicate with each other through a CAN bus, and the third-stage BMS and the PCS in the system communicate with each other through the CAN bus; and the EMS communicates with the second-stage BMS (or third-stage BMS), the PCS and the DCDC in an RS485 mode by using a ModBus RTU communication protocol. The communication topology architecture for the off-network no-network energy storage system solves the problem of local control of the energy storage system in an off-network no-network region, and realizes reliable and stable operation of the energy storage system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to energy storage technical field, especially relate to a communication topology architecture for off-grid networkless energy storage system. BACKGROUND

[0002] Energy storage system refers to the energy in the form of electric energy, through different media storage, when needed, release a kind of system.

[0003] The energy storage device composed of energy storage element and the grid access device composed of power electronic device become two parts of energy storage system. Energy storage device realizes energy storage, release or fast power exchange. Grid access device realizes the energy two-way transmission and conversion between energy storage device and grid, realizes power peak shaving, energy optimization, improves power supply reliability and power system stability and other functions.

[0004] For off-grid networkless energy storage system, local EMS reliable control and communication equipment are needed, so as to ensure the stable operation of the system, therefore, when energy storage battery system is off-grid networkless, the communication mode and method of the whole system are particularly important, and the reliability index and stability are a very important concern. UTILITY MODEL CONTENT

[0005] The utility model discloses a communication topology architecture for off-grid networkless energy storage system, which realizes stable communication between units in off-grid networkless energy storage system.

[0006] On the one hand, the utility model realizes the following technical scheme:

[0007] A communication topology architecture for off-grid networkless energy storage system, the communication topology architecture for off-grid networkless energy storage system includes: battery cluster, PCS, DCDC and EMS;

[0008] The battery cluster is composed of a plurality of battery boxes and one high-voltage control box in series, the first-level BMS of each battery box in the battery cluster is connected to the second-level BMS in the high-voltage control box in the battery cluster through the communication mode of daisy chain, when the battery cluster is unique, the PCS and the second-level BMS communicate through CAN bus.

[0009] The EMS communicates with the second-level BMS, PCS and DCDC through RS485 mode using ModBusRTU communication protocol.

[0010] According to a preferred embodiment, the battery cluster is connected with the PCS and the DCDC, the battery cluster is charged through the DCDC, and the PCS is powered through the DCDC and / or the battery cluster.

[0011] According to a preferred embodiment, the EMS is connected with the local IO input device through a dry contact access mode.

[0012] According to a preferred embodiment, the EMS communicates with the air conditioner and the temperature and humidity sensor in the off-grid network-free energy storage system through an RS485 mode using a ModBusRTU communication protocol.

[0013] According to a preferred embodiment, when a plurality of off-grid network-free energy storage systems are connected in parallel, the PCS and the secondary BMS in each off-grid network-free energy storage system are connected using a CAN bus.

[0014] In another aspect, the utility model also discloses:

[0015] A communication topology architecture for an off-grid network-free energy storage system, the communication topology architecture for the off-grid network-free energy storage system comprising: a plurality of battery clusters, a tertiary BMS, a PCS, a DCDC and an EMS;

[0016] The battery cluster is composed of a plurality of battery boxes and a high-voltage control box in series, the primary BMS of each battery box in the battery cluster is connected to the secondary BMS in the high-voltage control box in the battery cluster through a daisy chain communication mode, the secondary BMS of each battery cluster communicates with the tertiary BMS through a CAN bus, and the tertiary BMS in the system communicates with the PCS through a CAN bus.

[0017] The EMS communicates with the tertiary BMS, the PCS and the DCDC through an RS485 mode using a ModBusRTU communication protocol.

[0018] According to a preferred embodiment, the battery cluster is connected with the PCS and the DCDC, the battery cluster is charged through the DCDC, and the PCS is powered through the DCDC and / or the battery cluster.

[0019] According to a preferred embodiment, the EMS is connected with the local IO input device through a dry contact access mode.

[0020] According to a preferred embodiment, the EMS communicates with the air conditioner and the temperature and humidity sensor in the off-grid network-free energy storage system through an RS485 mode using a ModBusRTU communication protocol.

[0021] According to a preferred embodiment, when a plurality of off-grid network-free energy storage systems are connected in parallel, the PCS and the tertiary BMS in each off-grid network-free energy storage system are connected using a CAN bus.

[0022] The foregoing main scheme and each further selection scheme of the utility model can be freely combined to form multiple schemes, which are all the schemes that can be adopted and claimed by the utility model. Those skilled in the art can understand multiple combinations according to the prior art and common knowledge after understanding the utility model scheme, which are all the technical schemes claimed by the utility model, and are not listed here.

[0023] The utility model has the beneficial effects that:

[0024] The utility model is used for the communication topology framework of off-grid networkless energy storage system, solves the local control of the off-grid networkless energy storage system, and further realizes the more reliable and stable operation of the energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a communication topology framework schematic view for off-grid networkless energy storage system;

[0026] Figure 2 It is a parallel machine communication topology framework schematic view for off-grid networkless energy storage system;

[0027] Figure 3 It is a main loop system structure diagram for off-grid networkless energy storage system;

[0028] Figure 4 It is a parallel machine schematic view for off-grid networkless energy storage system. DETAILED DESCRIPTION

[0029] The implementation mode of the utility model is described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied through another different specific implementation mode, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0030] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0031] In the description of the utility model, it needs to be explained that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In addition, the utility model points out that, in the utility model, if the specific structures, connection relationships, positional relationships, power source relationships and the like are not specifically written, the structures, connection relationships, positional relationships, power source relationships and the like involved in the utility model can be known by those skilled in the art without creative labor on the basis of the prior art.

[0035] Example 1

[0036] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in the figure, a communication topology architecture for an off-grid network energy storage system is shown, which comprises a battery cluster, a PCS, a DCDC and an EMS.

[0037] Preferably, the primary BMS of each battery box in the battery cluster is connected to the secondary BMS in the high-voltage control box in the battery cluster through the daisy chain communication mode, and the PCS and the secondary BMS communicate through the CAN bus.

[0038] Preferably, the EMS and the secondary BMS communicate through RS485 using ModBus RTU communication protocol, uploading information to the EMS.

[0039] Preferably, the PCS and the secondary BMS communicate through CAN bus, the secondary BMS sends data and disable charging and discharging instructions to the PCS.

[0040] Preferably, the EMS and the DCDC communicate through RS485 using ModBus RTU communication protocol, when multiple DCDCs are used, the DCDC device address is modified for distinction and then information is uploaded to the EMS.

[0041] Preferably, the EMS and the PCS communicate through RS485 using ModBus RTU communication protocol, uploading information to the EMS.

[0042] Preferably, the EMS and the local IO input device are connected through dry contact access, used for uploading information to the EMS.

[0043] Preferably, the EMS and the air conditioner and temperature and humidity sensor in the off-grid network energy storage system communicate through RS485 using ModBus RTU communication protocol.

[0044] As shown in Figure 2 When several off-grid network energy storage systems are connected in parallel, the PCS and the secondary BMS in each off-grid network energy storage system are connected through CAN bus. By modifying the secondary BMS and PCS addresses to distinguish devices, the PCS and the PCS in each off-grid network energy storage system can communicate and exchange data, and then control the power output of the parallel system to allocate the power size that the system should discharge according to the battery SOC when discharging.

[0045] The technical scheme of the utility model is based on an off-grid network energy storage system, which is reliably controlled and communicated by local EMS. The data of the energy storage system is monitored through the local program control of the EMS. According to the set operation logic, when using the automatic operation mode, a single system can perform self-use charging and discharging off-grid operation, and when two single systems are connected in parallel, the charging circuits of the two groups are separately connected, the discharge output is connected in parallel, and the PCSs communicate and exchange data through CAN bus.

[0046] Example 2

[0047] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the figure shows a communication topology architecture for an off-grid networkless energy storage system, which includes a plurality of battery clusters, a three-level BMS, a PCS, a DCDC and an EMS.

[0048] Preferably, the primary BMS of each battery box in the battery cluster is connected to the secondary BMS in the high-voltage control box in the battery cluster through daisy chain communication, the secondary BMS of each battery cluster communicates with the three-level BMS through CAN bus, and the three-level BMS in the system communicates with the PCS through CAN bus.

[0049] Preferably, the EMS and the three-level BMS communicate through RS485 using ModBusRTU communication protocol, and information is uploaded to the EMS.

[0050] Preferably, the PCS and the three-level BMS communicate through CAN bus, and the three-level BMS sends data and disable charging and discharging instructions to the PCS.

[0051] Preferably, the EMS and the DCDC communicate through RS485 using ModBusRTU communication protocol, and when multiple DCDCs are used, the DCDC device address is modified for distinction and then information is uploaded to the EMS.

[0052] Preferably, the EMS and the PCS communicate through RS485 using ModBusRTU communication protocol, and information is uploaded to the EMS.

[0053] Preferably, the EMS and the local IO input device are connected through dry contact access, which is used to upload information to the EMS.

[0054] Preferably, the EMS and the air conditioner and temperature and humidity sensor in the off-grid networkless energy storage system communicate through RS485 using ModBusRTU communication protocol.

[0055] When a plurality of off-grid networkless energy storage systems are connected, the PCS and the three-level BMS in each off-grid networkless energy storage system are connected through CAN bus. By modifying the three-level BMS and PCS addresses to distinguish the devices, the PCS in each off-grid networkless energy storage system can communicate with each other and exchange data, so as to control the power output of the two systems and allocate the power size that the system should discharge according to the battery SOC when discharging.

[0056] The utility model discloses a technical scheme is based on off-grid networkless energy storage system, by local EMS reliable control and communication each equipment, through the data of the program control monitoring energy storage system of EMS local, according to the set operation logic, when using automatic operation mode, single system can carry out spontaneous self-use charge-discharge off-grid operation, when two single systems are parallelly connected, the charging loop of two groups is separately connected, and the discharge output is parallel output, and CAN bus is used between PCS to communicate and interact data.

[0057] Reference Figure 3 As shown in the figure, a kind of main loop system structure diagram for off-grid networkless energy storage system is shown, and the first level BMS in several series battery boxes is communicated with the second level BMS in high-voltage control box through daisy chain communication mode, to form a battery cluster.

[0058] The second level BMS in several high-voltage control boxes is communicated with the third level BMS in the system through CAN bus, and the third level BMS in the system is communicated with PCS through CAN bus. The high-voltage output of high-voltage control box is connected with the DC side of PCS and DCDC to form the DC coupling of system. Figure 4 The AC output of PCS is connected in parallel when the system is parallelly connected.

[0059] Off-grid networkless energy storage system, under the control of local EMS, spontaneous self-use charge-discharge off-grid operation, through photovoltaic through DCDC to provide the system DC coupling with continuous DC current, PCS will DC invert AC to load, and the excess DC current is provided to battery charging, and if the DC provided by photovoltaic through DCDC is insufficient to support PCS inversion to load, then battery is used as the main force to support PCS inversion.

[0060] The system is also applicable to grid-connected mode, peak clipping, battery priority mode, peak clipping: battery and photovoltaic invert on the grid during the day when the electricity price is high, and the grid charges the battery at night when the electricity price is low; battery priority: photovoltaic charges the battery first, and supplies power to load at the same time. When photovoltaic is insufficient to supply power to battery and load at the same time, the grid charges the battery, and supplies power to load at the same time.

[0061] The above only for the preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement and improvement, etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A communication topology architecture for off-grid networkless energy storage systems, characterized in that, The communication topology architecture for the off-grid network-free energy storage system comprises a battery cluster, a PCS, a DCDC and an EMS. The battery cluster is composed of a plurality of battery boxes and one high-voltage control box in series, the primary BMS of each battery box in the battery cluster is connected to the secondary BMS in the high-voltage control box in the battery cluster through a daisy chain communication mode, and the battery cluster is unique, the PCS and the secondary BMS are connected through a CAN bus. The EMS communicates with the secondary BMS, the PCS and the DCDC through an RS485 mode using a ModBusRTU communication protocol.

2. The communication topology architecture of claim 1, wherein, The battery cluster is connected with the PCS and the DCDC, the battery cluster is charged through the DCDC, and the PCS is powered through the DCDC and / or the battery cluster.

3. The communication topology architecture of claim 1, wherein, The EMS is connected with the local IO input device through a dry contact access mode.

4. The communication topology architecture of claim 1, wherein, The EMS communicates with the air conditioner and the temperature and humidity sensor in the off-grid network-free energy storage system through an RS485 mode using a ModBusRTU communication protocol.

5. The communication topology architecture of claim 1, wherein, When a plurality of off-grid network-free energy storage systems are connected, the PCS and the secondary BMS in each off-grid network-free energy storage system are connected through a CAN bus.

6. A communication topology architecture for an off-grid networkless energy storage system, comprising: The communication topology architecture for the off-grid network-free energy storage system comprises a plurality of battery clusters, a tertiary BMS, a PCS, a DCDC and an EMS. The battery cluster is composed of a plurality of battery boxes and one high-voltage control box in series, the primary BMS of each battery box in the battery cluster is connected to the secondary BMS in the high-voltage control box in the battery cluster through a daisy chain communication mode, the secondary BMS of each battery cluster is connected with the tertiary BMS through a CAN bus, and the tertiary BMS in the system is connected with the PCS through a CAN bus. The EMS communicates with the tertiary BMS, the PCS and the DCDC through an RS485 mode using a ModBusRTU communication protocol.

7. The communication topology architecture of claim 6, wherein, The battery cluster is connected with the PCS and the DCDC, the battery cluster is charged through the DCDC, and the PCS is powered through the DCDC and / or the battery cluster.

8. The communication topology architecture of claim 6, wherein, The EMS is connected with the local IO input device through a dry contact access mode.

9. The communication topology architecture of claim 6, wherein, The EMS communicates with the air conditioner and the temperature and humidity sensor in the off-grid network-free energy storage system through an RS485 mode using a ModBusRTU communication protocol.

10. The communication topology architecture of claim 6, wherein, When a plurality of off-grid network-free energy storage systems are connected, the PCS and the tertiary BMS in each off-grid network-free energy storage system are connected through a CAN bus.

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