Energy storage system applied to weak power grid

Abstract

The utility model provides an energy storage system applied to a weak power grid, and belongs to the technical field of electric power, and the system comprises an HMI which is in communication connection with an EMS; the EMS is in communication connection with the generator, the ATSE, the three-phase uncontrolled rectification unit, the DC / DC boost unit, the DC / AC inversion unit and the energy storage unit; the output end of the generator is electrically connected with the input end of the ATSE, and the input end of the ATSE is further electrically connected with a weak power grid; the output end of the ATSE is electrically connected with the input end of the three-phase uncontrolled rectification unit; the output end of the three-phase uncontrolled rectifying unit is electrically connected with the input end of the DC / DC boosting unit; the output end of the DC / DC boosting unit is connected with the input end of the DC / AC inversion unit; the output end of the DC / AC inverter unit is electrically connected to a load; and the input end of the DC / AC inversion unit is also electrically connected with the energy storage unit. According to the invention, the problems of unstable power utilization of a user load and low efficiency caused by instability of a weak power grid are improved.

Description

Technical Field

[0001] This application relates to the field of power technologies, and particularly to an energy storage system applied to a weak power grid. Background Art

[0002] In some special power consumption scenarios such as remote areas where the power grid is often unstable, a weak power grid is generally used. When the weak power grid is unstable, manifested as power outages, single-phase operation, phase sequence disorder, phase angle change and other power consumption problems, users have no power available. Therefore, an energy storage system is usually used to supply power to users.

[0003] Currently, in the prior art, most energy storage systems for weak power grids use battery clusters, which are charged when the weak power grid is stable. After the weak power grid power outage, the user manually switches to the energy storage system to replace the weak power grid to supply power to the user.

[0004] However, the inventor found that the prior art has at least the following technical problems: due to the various manifestations of the instability of the weak power grid, directly switching to the energy storage system will not only cause damage to the energy storage system by the weak power grid, but also lead to unstable and inefficient power consumption of the user load due to the instability of the weak power grid. Utility Model Content

[0005] This application provides an energy storage system applied to a weak power grid, which is used to solve the problems of unstable and inefficient power consumption of the user load caused by the instability of the weak power grid.

[0006] In a first aspect, this application provides an energy storage system applied to a weak power grid, including: a human-machine interface device HMI, an energy management unit EMS, a generator, an automatic transfer switch electrical appliance ATSE, a three-phase uncontrolled rectification unit, a DC / DC boost unit for DC-to-DC conversion, a DC / AC inverter unit for DC-to-AC conversion, and an energy storage unit;

[0007] Wherein, the HMI is communicatively connected to the EMS through a switch and a communication network;

[0008] The EMS is communicatively connected to the generator, ATSE, three-phase uncontrolled rectification unit, DC / DC boost unit, DC / AC inverter unit, and energy storage unit respectively through the switch and the communication network;

[0009] The output terminal of the generator is electrically connected to the input terminal of the ATSE, and the input terminal of the ATSE is also electrically connected to the weak power grid; the output terminal of the ATSE is electrically connected to the input terminal of the three-phase uncontrolled rectification unit; the output terminal of the three-phase uncontrolled rectification unit is electrically connected to the input terminal of the DC / DC boost unit; the output terminal of the DC / DC boost unit is connected to the input terminal of the DC / AC inversion unit; the output terminal of the DC / AC inversion unit is electrically connected to the load; the input terminal of the DC / AC inversion unit is also electrically connected to the energy storage unit.

[0010] In a possible implementation manner, the HMI is electrically connected to the DC / DC boost unit and the DC / AC inversion unit through a switch and a communication network.

[0011] In a possible implementation manner, the energy storage unit is a lithium battery energy storage unit.

[0012] In a possible implementation manner, the capacity of the energy storage unit is 240 kWh to 300 kWh, and the charge-discharge rate of the energy storage unit is below 0.5C.

[0013] In a possible implementation manner, the state of charge SOC division intervals of the energy storage unit include a normal operation interval [0.3, 0.9] and an emergency control interval [0.2, 0.95].

[0014] In a possible implementation manner, the lithium battery energy storage unit includes a lithium battery cluster, a battery management system BMS, a high-voltage box, and a fire protection device, and the EMS is connected to the BMS through an RS485 interface.

[0015] In a possible implementation manner, the operating voltage of the high-voltage side of the DC / DC boost unit is 650V to 850V, and the operating voltage range of the lithium battery cluster is between 650V and 850V.

[0016] In a possible implementation manner, the hardware of the EMS adopts a form of programmable logic controller PLC + digital signal processor DSP + human-machine interaction device HMI.

[0017] In a possible implementation manner, the system further includes: a first reserved server and a second reserved server, wherein the first reserved server is communicatively connected to the EMS through the switch and the Ethernet, and the second reserved server is connected to the EMS through an RS485 interface.

[0018] In a possible implementation manner, the system further includes a cloud platform, and the cloud platform is communicatively connected to the HMI through a switch and a communication network.

[0019] The energy storage system applied to a weak power grid provided by this application can use an EMS and a DC / DC boost unit to monitor the operating state of the weak power grid in real time. When the weak power grid is in unstable states such as power outage and phase loss, it combines a generator and / or an energy storage unit to perform power supply switching, providing more stable and efficient power consumption for the user's load. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural connection diagram of the energy storage system applied to a weak power grid provided by an embodiment of this application;

[0022] Figure 2 It is a schematic communication topology diagram of the energy storage system applied to a weak power grid provided by an embodiment of this application;

[0023] Figure 3 It is a schematic diagram of the SOC division interval of the energy storage unit 109 provided by an embodiment of this application.

[0024] Reference numerals: 101 - Human - Machine Interface Device HMI; 102 - Energy Management Unit EMS; 103 - Generator; 104 - Automatic Transfer Switching Equipment ATSE; 105 - Three - phase uncontrolled rectification unit; 106 - DC - to - DC boost unit; 107 - DC - to - AC inverter unit; 108 - Energy storage unit; 109 - First reserved server; 1010 - Second reserved server; 1011 - Cloud platform. Detailed Embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0026] Currently, for power grid construction carried out in some remote areas such as underdeveloped regions (such as power supply construction in Africa), weak power grids are used as user power grids in these areas. However, the weak power grids are often unstable, and the power grid shows situations such as power outages, single-phase operation, phase sequence disorder, and phase angle change, which result in frequent power fluctuations in the user power grid, causing problems of unstable and inefficient power consumption.

[0027] The inventors found that since users in these remote areas, such as villa users or industrial and commercial users, are not sensitive to power quality problems. Therefore, to solve the above technical problems, the embodiments of the present application provide the following technical concepts for solving problems: First, use a generator, a power grid, and an energy storage device to jointly supply power to users, and then implement communication among a human-machine interface device HMI, an energy management unit EMS, an automatic transfer switch electrical appliance ATSE, a three-phase uncontrolled rectifier unit, a DC / DC boost unit, and a DC / AC inverter unit to achieve automatic control to use different power supply sources to provide more stable and efficient power consumption for users.

[0028] Figure 1 It is a schematic structural connection diagram of an energy storage system applied to a weak power grid provided by an embodiment of the present application.

[0029] Figure 2 It is a schematic communication topology diagram of an energy storage system applied to a weak power grid provided by an embodiment of the present application.

[0030] As Figure 1 shown, the energy storage system applied to a weak power grid includes: a human-machine interface device HMI101, an energy management unit EMS102, a generator 103, an automatic transfer switch electrical appliance ATSE104, a three-phase uncontrolled rectifier unit 105, a DC / DC boost unit 106, a DC / AC inverter unit 107, and an energy storage unit 108.

[0031] As Figure 1 and Figure 2 shown, among them, HMI101 is communicatively connected to EMS through a switch and a communication network.

[0032] In this embodiment, the interface of HMI101 can be an RS485 interface. HMI101 can be used to implement interaction and information interaction between the system and the user, generally used to generate corresponding instructions in response to user operations, and send them to EMS through a switch and a communication network. Among them, the communication network can be a wired communication network such as Ethernet, and the communication network can also be a wireless communication network such as a 5G communication module.

[0033] In an optional embodiment of the present application, HMI101 is electrically connected to the DC / DC boost unit 106 and the DC / AC inverter unit 107 through a switch and a communication network.

[0034] The EMS102 is communicatively connected to the generator 103, the ATSE 104, the three-phase uncontrolled rectifier unit 105, the DC / DC boost unit 106, the DC / AC inverter unit 107, and the energy storage unit 108 through a switch and Ethernet respectively.

[0035] In this embodiment, the EMS102 serves as the core control unit of the entire energy storage system applied to the weak grid, mainly responsible for obtaining the operating status of the entire system from each communicatively connected unit in real time, making logical protection, and coordinating the power magnitude and energy flow method of each unit. The EMS can be of an independent modular design.

[0036] In an optional embodiment of the present application, the hardware of the EMS102 can adopt the form of PLC + DSP + HMI.

[0037] The output end of the generator 103 is electrically connected to the input end of the ATSE 104, and the input end of the ATSE 104 is also electrically connected to the weak grid. The output end of the ATSE 104 is electrically connected to the input end of the three-phase uncontrolled rectifier unit 105; the output end of the three-phase uncontrolled rectifier unit 105 is electrically connected to the input end of the DC / DC boost unit 106; the output end of the DC / DC boost unit 106 is connected to the input end of the DC / AC inverter unit 107; the output end of the DC / AC inverter unit 107 is electrically connected to the load; the input end of the DC / AC inverter unit 107 is also electrically connected to the energy storage unit 108.

[0038] In this embodiment, the weak grid can adopt 380V / 50Hz three-phase alternating current, which is often unstable, and the specific manifestations are shown in Table 1 below:

[0039]

[0040]

[0041] Table 1

[0042] As shown in Table 1, the power grids used in some remote areas often show unstable power consumption conditions such as frequent power outages, phase loss, phase sequence disorder, or phase angle change. Therefore, when the power consumption is unstable, that is, when the weak grid does not meet the operating conditions of the three-phase uncontrolled rectifier unit 105, the ATSE 104 cuts off the weak grid, and the generator 103 is switched in to provide electrical energy for the user's load.

[0043] In this embodiment, when the weak grid is powered off or the weak grid does not meet the operating conditions of the three-phase uncontrolled rectifier unit 1054, the ATSE 104 cuts off the weak grid, and the generator 103 is switched in to supply energy to the load. When the generator 103 is switched in and put into operation, the generator 103 should start up slowly; the generator 103 should operate at the highest efficiency point to supply energy to the load. At the same time, if the energy storage unit 108 is not fully charged, the power of the generator 103 minus the load is used to charge the energy storage unit 108 with the excess energy; if the energy storage unit 108 is fully charged, the power of the generator 103 follows the load operation. When switching from the weak grid to the generator 103, during the slow start-up process of the generator 103, the energy storage unit 108 supplies energy to the load. The generator 103 uses the user's original generator. For example, the capacity of the user's original generator adopted in this embodiment is 150 kVA / 120 kW.

[0044] The working process of the ATSE 104 is as follows: The power of the energy storage unit 108 used by the user comes from the weak grid or the generator 103. Since the weak grid operates unstably, when there is a power outage or the weak grid does not meet the operating conditions of the three-phase uncontrolled rectifier unit 105, the grid is cut off through the ATSE 104, and the generator 103 is switched in; when the weak grid resumes or meets the operating conditions of the three-phase uncontrolled rectifier unit 105, the generator 103 is cut off through the ATSE 104, and the weak grid is switched in to ensure the normal operation of the energy storage unit 108.

[0045] The three-phase uncontrolled rectifier unit 105 may include 6 rectifier diodes. Every two rectifier diodes are used for one-phase rectification and output. The working state of each one-phase rectification and output is the same as that of a single-phase bridge rectifier circuit, and is used to rectify the three-phase AC full wave of the weak grid or the generator 103 into DC1.

[0046] The DC / DC boost unit 106 boosts the DC1 rectified and output by the three-phase uncontrolled rectifier unit 105 to DC2. Under normal weak grid or generator 103 operating conditions, the DC / DC boost unit 106 operates at the rated power condition; under the condition that one phase of the weak grid is missing or the phase sequences of two phases overlap, the DC / DC boost unit 106 operates at 50% of the rated power. Under different operating conditions controlled by the EMS 102, the DC / DC boost unit 106 coordinates or adjusts the charging and discharging power of the energy storage unit 108 by adjusting the input energy of the weak grid or the generator 102 to ensure the safety of the energy storage unit 108.

[0047] Specifically, in an optional embodiment of the present application, the three-phase uncontrolled rectifier unit 106 may be a three-phase full-bridge uncontrolled rectifier. Under different weak grid operating conditions, the operating state parameters of the three-phase uncontrolled rectifier unit 106 are shown in Table 2 below.

[0048]

[0049] Table 2

[0050] As can be seen from Table 2 above, under different grid states, the operating states of the three-phase uncontrolled rectifier unit 105 are mainly divided into three types:

[0051] 1. Full-bridge rectification: When the weak grid is normal or the phases of the weak grid are misaligned by 120°, the rectified output voltage of the three-phase uncontrolled rectifier unit 105 is about 515V, and the DC / DC boost unit 106 operates at full power.

[0052] 2. Single-phase rectification: When one phase of the weak grid is missing or the phase angle changes (specifically according to the simulation), the rectified output voltage is about 342V, and the DC / DC boost unit 106 operates at 50% of the rated power.

[0053] 3. Other operating states: When the grid is powered off or the phase angle changes, etc. (please refer to Table 1 for details), at this time, the DC / DC boost unit 106 stops operating, and it is determined whether to switch to the generator 103 according to the SOC state of the energy storage unit 108.

[0054] The DC / AC inverter unit 107 can be used to invert the DC2 on the DC side output by the DC / DC boost unit 106 into 380V / 50Hz alternating current to provide electrical energy for the load. In an optional embodiment of the present application, through actual measurement by the inventor, the load is a civilian load, and the maximum load is electrical equipment such as water pumps and central air conditioners. There is no single large-capacity load, and the overall maximum operating power of the load does not exceed 80KW.

[0055] The energy storage unit 108 can be used to store electrical energy and provide electrical energy for the load. For example, the energy storage unit 108 can be a storage battery. In an optional embodiment of the present application, the energy storage unit 108 can be a lithium-ion energy storage unit.

[0056] In an optional embodiment of the present application, the capacity of the energy storage unit 108 is from 240kWh to 300kWh, and the charge-discharge rate of the energy storage unit is below 0.5C.

[0057] In this embodiment, by controlling the charge-discharge rate of the energy storage unit 108 to be below 0.5C, such as 0.2C, the charge-discharge cycle life of the energy storage unit 108 can be increased, making the service life of the entire energy storage system applied to the weak grid longer and more stable.

[0058] In an optional embodiment of the present application, the state of charge SOC division intervals of the energy storage unit 108 include a normal operation interval [0.3, 0.9] and an emergency control interval [0.2, 0.95].

[0059] In this embodiment, by dividing the state of charge (SOC) range of the energy storage unit 108 into a normal operation range and an emergency control range, these normal operation ranges and emergency control ranges can be used by the EMS 102 to control the charging and discharging process of the energy storage unit 108, avoiding overcharging or over-discharging, which may affect the lifespan of the energy storage unit 108, and thus extending the service life of the entire energy storage system applied to the weak grid.

[0060] Figure 3 It is a schematic diagram of the SOC division range of the energy storage unit 109 provided by the embodiment of the present application.

[0061] In this embodiment, the SOC state of the energy storage unit 108 is divided into different states according to Figure 3 When at least one of the weak grid, the generator 103, or the energy storage unit 108 is the power supply for the user load, the SOC of the energy storage unit 108 can enable the EMS 102 to make corresponding judgments and control the ATSE 104 to perform corresponding disconnection or connection operations.

[0062] As an optional embodiment of the present application, the lithium-ion energy storage unit 108 specifically includes a lithium battery cluster, a battery management system (BMS), a high-voltage box, and a fire-fighting device. The lithium-ion energy storage unit can provide interfaces such as DC power lines, communication lines, and dry contacts. The batteries in the lithium battery cluster can use lithium iron phosphate batteries. In this embodiment, the total energy that the entire lithium battery cluster can store can be designed to be 240 - 300 kWh, and when charging and discharging at a rate below 0.5C, it can provide electrical energy for the load for 8 - 12 hours. Moreover, the lithium battery cluster can be connected across the DC bus DC2 through the high-voltage box. The BMS is used to monitor the operating state of the lithium battery cluster, and the fire-fighting device can improve the fire prevention performance of the entire energy storage unit, thereby enhancing safety. When the weak grid has a power outage or the power source of power supply providers such as generators is missing, the energy storage unit can be used to provide energy for the load.

[0063] In an optional embodiment of the present application, the operating voltage on the high-voltage side of the DC / DC boost unit 106 is 650V to 850V, and the operating voltage range of the lithium battery cluster is between 650V and 850V.

[0064] In an optional embodiment of the present application, the energy storage system applied to the weak grid provided by the embodiment of the present application further includes: a first reserved server 109 and a second reserved server 1010, where the first reserved server 109 is communicatively connected to the EMS 102 through a switch and Ethernet, and the second reserved server 1010 is connected to the EMS 102 through an RS485 interface.

[0065] In this embodiment, the first reserved server 109 is used as a standby circuit. When the DC / DC boost unit 106 or the DC / AC inverter unit 107 is damaged, the first reserved server 109 can be used to adjust the voltage. The second reserved server 1010 can be used as the monitoring core of the standby battery management system. When the BMS cannot operate, the second reserved server 1010 can be used to monitor the operating status of the energy storage unit 102.

[0066] In an alternative embodiment of the present application, the energy storage system applied to a weak grid further includes a cloud platform 1011. The cloud platform 1011 is communicatively connected to the HMI 101 through a switch and a communication network.

[0067] In this embodiment, the cloud platform 1011 can allow users to remotely send operation instructions to the EMS 101, enabling the EMS 101 to perform corresponding actions on the entire energy storage system applied to the weak grid according to the sent operation instructions, providing more stable electrical energy for the user's load.

[0068] The implementation principle of the energy storage system applied to a weak grid provided by the embodiments of the present application is as follows:

[0069] The grid status is judged according to the DC-side voltage value of the uncontrolled rectifier unit 105, and in combination with the SOC status of the energy storage unit 108, it is judged when to switch the weak grid and the generator 103. The specific situation is as follows:

[0070] When the EMS 102 monitors that the weak grid is operating normally according to the received data, it then controls the DC / DC boost unit 106 to operate. At this time, the weak grid supplies power.

[0071] When it is detected that the weak grid is operating with a missing phase, it is then continued to detect whether the SOC of the energy storage unit 108 is less than or equal to the lower limit value. If so, the ASTE 104 is controlled to disconnect the grid and the generator 103 is gradually put into operation. It is continued to detect whether the generator 103 meets the load. If not, the generator 103 + the weak grid supply power; if so, it is continued to detect whether the SOC of the energy storage unit 108 is greater than the upper limit value. If not, the generator 103 supplies power and charges the energy storage unit 108 at the same time. If so, the generator 103 is disconnected and the weak grid is put into operation.

[0072] When it is detected that the SOC of the energy storage unit 108 is greater than the lower limit value, the ASTE 104 disconnects the grid and the generator 103 is immediately put into operation. When the weak grid has not been disconnected and the generator 103 has not been put into operation, it is continued to detect whether the weak grid meets the load. If so, the weak grid with a missing phase supplies power and can charge the energy storage unit 108 at the same time. If not, the weak grid with a missing phase + the energy storage unit 108 supply power.

[0073] When a grid operation fault is detected, the DC / DC boost unit 106 stops, and continues to detect that the SOC of the energy storage unit 108 is less than or equal to the lower limit value. If not, the generator 103 is disconnected. After the generator 103 is disconnected, power is supplied to the energy storage unit 108. If so, the weak grid is disconnected, the generator 103 is gradually connected, and it continues to detect whether the generator 103 meets the load. If not, the generator 103 and the energy storage unit 108 supply power. If so, it continues to detect whether the SOC of the energy storage unit 108 is greater than or equal to the upper limit value. If so, the generator 103 is disconnected. If not, the generator 103 supplies power and can charge the energy storage unit 108 at the same time.

[0074] In summary, the energy storage system applied to a weak grid provided by the embodiments of the present application can, by using the EMS and the DC / DC boost unit 106, monitor the operation state of the weak grid in real time, and when the weak grid is in unstable states such as power outages and phase deficiencies, perform power supply switching in combination with the generator and / or the energy storage unit 108 to provide more stable and efficient power consumption for the user's load.

[0075] In several embodiments provided in the present application, it should be understood that the disclosed system and related hardware can be implemented in other ways. For example, the system embodiments described above are only illustrative. For example, the above division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of devices or modules can be in electrical, mechanical or other forms.

[0076] The modules described above as separate components may or may not be physically separated. The components displayed as modules may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to implement the solution of this embodiment.

[0077] In addition, each functional module in various embodiments of the present application can be integrated in a processing unit, or each module can exist physically alone, or two or more modules can be integrated in one unit. The unit composed of the above modules can be implemented in the form of hardware, or in the form of a hardware plus a software functional unit.

[0078] to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage system applied to a weak power grid, characterized in that, Comprising: A human-machine interaction device HMI, an energy management unit EMS, a generator, an automatic transfer switch electrical appliance ATSE, a three-phase uncontrolled rectification unit, a DC / DC boost unit for DC-to-DC conversion, a DC / AC inverter unit for DC-to-AC conversion, and an energy storage unit; Among them, the HMI is communicatively connected to the EMS through a switch and a communication network; The EMS is communicatively connected to the generator, ATSE, three-phase uncontrolled rectification unit, DC / DC boost unit, DC / AC inverter unit, and energy storage unit respectively through the switch and the communication network; The output end of the generator is electrically connected to the input end of the ATSE, and the input end of the ATSE is also electrically connected to a weak power grid; the output end of the ATSE is electrically connected to the input end of the three-phase uncontrolled rectification unit; the output end of the three-phase uncontrolled rectification unit is electrically connected to the input end of the DC / DC boost unit; the output end of the DC / DC boost unit is connected to the input end of the DC / AC inverter unit; the output end of the DC / AC inverter unit is electrically connected to a load; the input end of the DC / AC inverter unit is also electrically connected to the energy storage unit.

2. The system according to claim 1, wherein The HMI is electrically connected to the DC / DC boost unit and the DC / AC inverter unit through a switch and a communication network.

3. The system according to claim 1, wherein The energy storage unit is a lithium-ion energy storage unit.

4. The system according to claim 3, wherein The capacity of the energy storage unit is from 240 kWh to 300 kWh, and the charge-discharge rate of the energy storage unit is below 0.5C.

5. The system according to claim 3, characterized in that, The state of charge SOC division intervals of the energy storage unit include a normal operation interval [0.3, 0.9] and an emergency control interval [0.2, 0.95].

6. The system according to claim 3, characterized in that, The lithium-ion energy storage unit includes a lithium battery cluster, a battery management system BMS, a high-voltage box, and a fire-fighting device, The EMS is connected to the BMS through an RS485 interface.

7. The system according to claim 6, wherein The working voltage of the high-voltage side of the DC / DC boost unit is from 650V to 850V, and the working voltage of the low-voltage side is from 300V to 600V. The operating voltage range of the lithium battery cluster is between 650V and 850V.

8. The system according to claim 1, wherein The hardware of the EMS adopts a form of programmable logic controller PLC + digital signal processor DSP + human-machine interaction device HMI.

9. The system according to claim 1, characterized in that The system further includes: a first reserved server and a second reserved server, wherein the first reserved server is communicatively connected to the EMS through the switch and Ethernet, and the second reserved server is connected to the EMS through an RS485 interface.

10. The system according to any one of claims 1 to 9, characterized in that, The system further includes a cloud platform, and the cloud platform is communicatively connected to the HMI through a switch and a communication network.

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