Multi-machine parallel energy storage device based on independent communication structure between battery packs

Abstract

The utility model provides a multi-machine parallel type energy storage device based on an independent communication structure among battery packs, which is characterized in that independent communication connection structures are arranged among a plurality of battery packs of a plurality of energy storage converter units of the multi-machine parallel type energy storage device; specifically, a plurality of battery packs of a plurality of energy storage converter units are in communication connection through a field bus, and the field bus is further connected with a first CPU of the centralized control device; and the plurality of energy storage converters of the plurality of energy storage converter units are connected with the second CPU of the centralized control device through optical fiber communication interfaces. According to the utility model, independent communication connection structures are arranged among the plurality of battery packs of the plurality of energy storage converter units of the multi-machine parallel energy storage device, and the battery packs and the converters of the energy storage converter units are respectively in port connection through the two CPUs, so that the fault risk is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage converter control, and in particular to a multi-machine parallel energy storage device based on an independent communication structure between battery packs. Background Art

[0002] The energy storage battery system has the functions of smooth transition, peak shaving and valley filling, frequency and voltage regulation, etc. It can smooth the fluctuation of solar and wind power generation output, improve the safety and stability of power grid operation, and has been widely used on the grid side, user side and microgrid. As the application of battery energy storage systems becomes more and more extensive, the demand for increasing the capacity of energy storage systems is increasing, requiring more energy storage inverter units to be able to operate in parallel. As the number of energy storage inverter units in parallel increases, the risk of failure also increases greatly.

[0003] In the prior art, the battery pack and the inverter in a multi-machine parallel energy storage inverter unit are generally connected to a control unit by a unified optical fiber communication structure, such as a storage battery system communication architecture disclosed in Chinese patent publication number CN215498362U and a large-scale energy storage system disclosed in Chinese patent publication number CN112542893A.

[0004] A Chinese patent with publication number CN207967938U discloses a network architecture of an energy storage system based on multiple communication methods. Although a battery matrix is ​​designed, it is limited to the control structure inside a single energy storage inverter unit and cannot be used in a multi-machine parallel energy storage structure. It has no reference value for the control structure of a multi-machine parallel energy storage device.

[0005] A Chinese patent with publication number CN115173446A discloses an electrochemical energy storage system and a centralized control device. Although the battery pack and the converter are separately connected to the control device, no separate communication circuit is set between the multiple battery packs of the multiple energy storage converter units, and the battery pack and the converter are both connected by the optical fiber communication port of the FPGA, and the risk of failure is not shared.

[0006] In summary, the battery packs in the multi-machine parallel energy storage inverter units in the prior art do not form their own independent communication connection structure, and are all connected to the control device through the inverter or without the inverter through the optical fiber communication port. When more and more energy storage inverter units are connected in parallel, the port burden of the control device is increased, and the risk of battery pack connection failure is increased. Utility Model Content

[0007] In order to solve the technical problems in the background technology, the utility model provides a multi-machine parallel energy storage device based on an independent communication structure between battery packs, a separate communication connection structure is set between multiple battery packs of multiple energy storage inverter units of the multi-machine parallel energy storage device, and the battery packs and the inverters of the energy storage inverter unit are respectively connected by ports of two CPUs, which greatly reduces the risk of failure.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A multi-machine parallel energy storage device based on an independent communication structure between battery packs, wherein the energy storage device is composed of multiple energy storage converter units connected in parallel on an AC power grid, each energy storage converter unit includes an energy storage converter and a battery pack connected thereto; each energy storage converter unit is controlled by a centralized control device, and the centralized control device includes a first CPU and a second CPU; the first CPU and the second CPU are connected in SPI communication.

[0010] The utility model is characterized in that a separate communication connection structure is set between the multiple battery packs of the multiple energy storage inverter units of the multi-machine parallel energy storage device, specifically: the multiple battery packs of the multiple energy storage inverter units are connected together through field bus communication, and the field bus is also connected to the first CPU of the centralized control device; the multiple energy storage inverters of the multiple energy storage inverter units are connected to the second CPU of the centralized control device through an optical fiber communication interface.

[0011] Furthermore, the first CPU is provided with a first CAN bus communication port, and the first CPU is connected to multiple battery packs in multiple energy storage inverter units through the first CAN bus communication port; the second CPU is provided with multiple optical fiber communication ports, and the second CPU is connected to multiple energy storage inverters in multiple energy storage inverter units through the multiple optical fiber communication ports.

[0012] Furthermore, the first CPU is provided with an ADC AC voltage acquisition port and an ADC AC current acquisition port; the first CPU is connected to the three-phase power supply end of the three-phase AC power grid through the ADC AC voltage acquisition port, and the first CPU is connected to the current acquisition device of the three-phase AC power grid through the ADC AC current acquisition port.

[0013] Furthermore, the first CPU is provided with a second CAN bus communication port, and the first CPU is connected to a host computer having a superior energy management system via the second CAN bus communication port.

[0014] Furthermore, the first CPU is provided with an RS485 communication port, and the first CPU is connected to a touch screen of a human-computer interaction interface via the RS485 communication port.

[0015] Furthermore, the first CPU is provided with an ADC temperature acquisition port, and the first CPU is connected to the energy storage inverter through the ADC temperature acquisition port to collect the cabinet ambient temperature of the energy storage inverter.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1) In the prior art, the network architecture of an energy storage system based on multiple communication methods is an internal structure of a single-machine mode and does not belong to a centralized control structure. The utility model is applied to the centralized control structure of a multi-machine parallel energy storage device, and a separate communication connection structure is set between multiple battery packs of multiple energy storage converter units of the multi-machine parallel energy storage device, and the battery pack and the converter of the energy storage converter unit are respectively connected by two CPUs for port connection, which greatly reduces the risk of failure.

[0018] 2) In the prior art, an electrochemical energy storage system and centralized control device with publication number CN115173446A, although the battery pack and the converter are connected to the control device separately, no separate communication circuit is set between the multiple battery packs of the multiple energy storage converter units, and the battery pack and the converter are both connected by the optical fiber communication port of the FPGA, and the risk of failure is not shared. The utility model sets a separate communication connection structure between the multiple battery packs of the multiple energy storage converter units of the multi-machine parallel energy storage device. The centralized control device of the utility model has two CPUs, the first CPU is responsible for the battery pack communication, and the second CPU is responsible for the optical fiber port connection of the converter. The two CPUs work together to reduce the port burden and the risk of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall structural diagram of a multi-machine parallel energy storage device based on an independent communication structure between battery packs of the utility model;

[0020] Figure 2 This is the electrical structure block diagram of the centralized control device of the utility model;

[0021] Figure 3 This is a port structure block diagram of the centralized control device of the utility model;

[0022] Figure 4 It is a port diagram of the CAN bus part and the SPI part of the first CPU of the embodiment of the utility model;

[0023] Figure 5 This is a diagram of the ADC portion of the first CPU port of an embodiment of the utility model;

[0024] Figure 6This is a port diagram of the RS485 part and the DI and DO parts of the first CPU of the embodiment of the utility model;

[0025] Figure 7 This is a diagram of the optical fiber communication port of the second CPU of an embodiment of the utility model;

[0026] Figure 8 It is the SPI port of the second CPU in the embodiment of the utility model. DETAILED DESCRIPTION

[0027] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0028] like Figure 1 As shown, a multi-machine parallel energy storage device based on an independent communication structure between battery packs, the energy storage device is composed of multiple energy storage converter units connected in parallel on an AC power grid, each energy storage converter unit includes an energy storage converter PCSn (PCS1-PCS8 in the figure of this embodiment) and a battery pack battn (batt1-batt8 in the figure of this embodiment) connected thereto; each energy storage converter unit is controlled by a centralized control device. Figure 2-3 As shown, the centralized control device includes a first CPU (DSP in the figure of this embodiment) and a second CPU (FPGA in the figure of this embodiment); the first CPU and the second CPU are connected in SPI communication. Figure 1 The symbols QD, QS and Q in the figure are circuit breakers, RD is a fuse, B is a transformer, and CT is a current transformer. This part is the prior art.

[0029] The improvement of the utility model is that a separate communication connection structure is provided between multiple battery packs of multiple energy storage converter units of a multi-machine parallel energy storage device, such as Figure 1-3 As shown, specifically: multiple battery packs batt1-battn of multiple energy storage inverter units are connected together through a field bus (CAN bus in the figure of this embodiment), and the field bus is also connected to the first CPU of the centralized control device; multiple energy storage inverters PCS1-PCSn of multiple energy storage inverter units are connected to the second CPU of the centralized control device through an optical fiber communication interface.

[0030] The following is an embodiment of the centralized control device provided by the utility model.

[0031] Figure 4-6 A port design diagram of a first CPU of an embodiment of a centralized control device is provided.

[0032] In this embodiment, the first CPU is a DSP chip.

[0033] like Figure 4As shown, the first CPU described in this embodiment is provided with a first CAN bus communication port (CANA_TX, CANA_RX), and the first CPU is connected to multiple battery packs in multiple energy storage converter units through the first CAN bus communication port. In this embodiment, the first CPU described is provided with a second CAN bus communication port (CANB_TX, CANB_RX), and the first CPU is connected to a host computer with a superior energy management system through the second CAN bus communication port.

[0034] like Figure 3 As shown, the first CPU is provided with an ADC AC voltage acquisition port and an ADC AC current acquisition port; the first CPU is connected to the three-phase power supply end of the three-phase AC power grid through the ADC AC voltage acquisition port, and the first CPU is connected to the current acquisition device of the three-phase AC power grid through the ADC AC current acquisition port. In this embodiment, the first CPU is provided with an ADC temperature acquisition port, and the first CPU is connected to the energy storage inverter through the ADC temperature acquisition port to collect the cabinet ambient temperature of the energy storage inverter. Figure 5 In the embodiment, a plurality of ADC interfaces (ADCIN interfaces in the figure) are designed, and an ADC AC voltage acquisition port, an ADC AC current acquisition port, and an ADC temperature acquisition port can be freely allocated.

[0035] like Figure 6 As shown, in this embodiment, the first CPU is provided with an RS485 communication port (SCI_TX, SCI_RX ports in the figure), and the first CPU is connected to the touch screen of the human-computer interaction interface via the RS485 communication port. Figure 6 As shown, the first CPU is also designed with multiple DI and DO ports.

[0036] Figure 7-8 A port design diagram of a second CPU of an embodiment of a centralized control device is provided.

[0037] like Figure 7 As shown, the second CPU uses an FPGA chip. The second CPU is provided with multiple optical fiber communication ports (F_TX1-F_TX8, RX1-RX8 ports in the figure), and the second CPU is connected to multiple energy storage converters PCS1-PCS8 in multiple energy storage converter units through the multiple optical fiber communication ports. Figure 8 SPI port for the second CPU.

[0038] In summary, the utility model provides a multi-machine parallel energy storage device based on an independent communication structure between battery packs, and sets a separate communication connection structure between multiple battery packs of multiple energy storage inverter units of the multi-machine parallel energy storage device. In addition, in the design of the centralized control device, the battery packs and the inverters of the energy storage inverter unit are respectively connected by ports of two CPUs, which greatly reduces the risk of failure.

[0039] The above embodiments are implemented on the premise of the technical solution of the utility model, and detailed implementation methods and specific operation processes are given, but the protection scope of the utility model is not limited to the above embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A multi-machine parallel energy storage device based on an independent communication structure between battery packs, wherein the energy storage device is composed of multiple energy storage converter units connected in parallel on an AC power grid, each energy storage converter unit includes an energy storage converter and a battery pack connected thereto; each energy storage converter unit is controlled by a centralized control device, and the centralized control device includes a first CPU and a second CPU; the first CPU and the second CPU are connected by SPI communication; It is characterized in that The multiple battery packs of the multiple energy storage converter units are connected together via field bus communication, and the field bus is also connected to the first CPU of the centralized control device; The multiple energy storage converters of the multiple energy storage converter units are connected to the second CPU of the centralized control device via an optical fiber communication interface.

2. According to claim 1, a multi-machine parallel energy storage device based on an independent communication structure between battery packs is characterized in that: The first CPU is provided with a first CAN bus communication port, and the first CPU is connected to multiple battery packs in multiple energy storage converter units through the first CAN bus communication port; The second CPU is provided with a plurality of optical fiber communication ports, and the second CPU is connected to a plurality of energy storage converters in a plurality of energy storage converter units through the plurality of optical fiber communication ports.

3. According to claim 1, a multi-machine parallel energy storage device based on an independent communication structure between battery packs is characterized in that: The first CPU is provided with an ADC AC voltage acquisition port and an ADC AC current acquisition port; the first CPU is connected to the three-phase power supply end of the three-phase AC power grid through the ADC AC voltage acquisition port, and the first CPU is connected to the current acquisition device of the three-phase AC power grid through the ADC AC current acquisition port.

4. According to claim 1, a multi-machine parallel energy storage device based on an independent communication structure between battery packs is characterized in that: The first CPU is provided with a second CAN bus communication port, and the first CPU is connected to a host computer having a superior energy management system via the second CAN bus communication port.

5. According to claim 1, a multi-machine parallel energy storage device based on an independent communication structure between battery packs is characterized in that: The first CPU is provided with an RS485 communication port, and the first CPU is connected to the touch screen of the human-computer interaction interface via the RS485 communication port.

6. According to claim 1, a multi-machine parallel energy storage device based on an independent communication structure between battery packs is characterized in that: The first CPU is provided with an ADC temperature acquisition port, and the first CPU is connected to the energy storage converter via the ADC temperature acquisition port to collect the cabinet ambient temperature of the energy storage converter.

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