Hybrid load energy storage system and control method applicable to hydrometallurgical smelter microgrid

Abstract

The present invention provides a hybrid load energy storage system and control method suitable for a hydrometallurgical smelter microgrid, relating to the field of microgrid technology. The system includes: a first power-consuming device, a second power-consuming device, a first energy storage device, and a second energy storage device. The first power-consuming device has a lower power priority than the second power-consuming device. The first energy storage device is a grid-connected energy storage device, and the second energy storage device is a grid-connected energy storage device. The first power-consuming device is connected to the first energy storage device via a branch provided with a first circuit breaker, and the second power-consuming device is connected to the second energy storage device via a branch provided with a second circuit breaker. The first energy storage device and the second energy storage device are connected to an AC busbar via branches provided with a third circuit breaker and a fourth circuit breaker, respectively. The AC busbar is connected to an external power grid, and the first power-consuming device and the second power-consuming device are connected to the AC busbar via branches provided with a fifth circuit breaker and a sixth circuit breaker, respectively. The present invention can ensure production after an external power grid power supply is interrupted.

Description

Technical Field

[0001] The present invention relates to the field of microgrids, and in particular to a hybrid load energy storage system suitable for a microgrid in a hydrometallurgical plant and a control method thereof. Background Art

[0002] During factory operation, power outages and power cuts may occur due to power shortages on the external grid, resulting in isolated grid operation. Restarting large factory equipment after shutdown can be very time-consuming. For example, after a large asynchronous motor used in industrial production in a hydrometallurgical plant is shut down, some material may remain inside the downstream equipment, such as ball mills and crushers. Restarting the machine after shutdown requires a complex technical process, including cranking, variable frequency motor activation, speed increase, and load-based operation.

[0003] In existing technology, energy storage systems can be configured for factories with unstable power supplies. However, conventional on-grid and off-grid energy storage systems present certain power supply risks during actual production processes: when the external grid power supply is reduced but not completely lost, the system can participate in the energy supply and distribution of the factory microgrid based on the voltage and frequency support provided by the external grid. However, when the external grid completely loses its power supply capacity, the factory's self-contained generator sets require a certain amount of time to start up and connect to the grid. During this period, high-energy-consuming machinery will simply shut down, resulting in serious safety hazards and potentially severe economic and financial losses. In other words, the energy storage system configuration in existing technology cannot guarantee factory production operations after the factory's external grid power supply is interrupted. Summary of the Invention

[0004] The present invention provides a hybrid load energy storage system and a control method thereof suitable for a microgrid of a hydrometallurgical plant, so as to solve the defect in the prior art that it is impossible to ensure factory production after the power supply terminal of the factory's external power grid is connected, and to ensure factory production after the power supply of the factory's external power grid is interrupted.

[0005] The present invention provides a hybrid load energy storage system suitable for a hydrometallurgical smelter microgrid, comprising: a plurality of first power-consuming devices, a plurality of second power-consuming devices, a first energy storage device, and a second energy storage device, wherein the power consumption priority of the first power-consuming devices is lower than the power consumption priority of the second power-consuming devices, the first energy storage device is an on-grid or off-grid energy storage device, and the second energy storage device is a grid-connected energy storage device;

[0006] Each of the first electrical devices is connected to the first energy storage device through a branch with a first circuit breaker, and each of the second electrical devices is connected to the second energy storage device through a branch with a second circuit breaker. The first energy storage device is connected to the AC bus through a branch with a third circuit breaker, and the second energy storage device is connected to the AC bus through a branch with a fourth circuit breaker. The AC bus is connected to the external power grid. The first electrical device is connected to the AC bus through a branch with a fifth circuit breaker, and the second electrical device is connected to the AC bus through a branch with a sixth circuit breaker.

[0007] The present invention provides a control method for a hybrid load energy storage system applicable to a hydrometallurgical plant microgrid, comprising: when the external power grid is powered off, controlling the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker and the third circuit breaker to be closed;

[0008] controlling the opening and closing of the fifth circuit breaker corresponding to the first electrical device based on the power outage priority of the first electrical device, wherein the power outage priority reflects the degree of impact of the power outage of the first electrical device on factory production;

[0009] After the second energy storage device provides stable voltage and frequency support, the third circuit breaker is controlled to close.

[0010] According to a hybrid load energy storage system control method applicable to a hydrometallurgical smelter microgrid provided by the present invention, when the external power grid is not powered off, the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker, and the sixth circuit breaker are kept closed, and the first circuit breaker and the second circuit breaker are kept open.

[0011] According to a hybrid load energy storage system control method applicable to a hydrometallurgical smelter microgrid provided by the present invention, the method of controlling the opening and closing of the fifth circuit breaker corresponding to the first electrical device based on the power-off priority of the first electrical device includes:

[0012] When the power-off priority of the first electrical device is the first power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to close, and controlling the first electrical device to reduce the load within the process requirement;

[0013] When the power-off priority of the first electrical device is the second power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to close, and controlling the first electrical device to partially shut down;

[0014] When the power-off priority of the first electrical device is the third power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to open;

[0015] The impact of power outage of the electrical equipment corresponding to the first power outage priority on production is greater than that of the second power outage priority, and the impact of power outage of the electrical equipment corresponding to the second power outage priority on production is greater than that of the third power outage priority.

[0016] According to a hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid provided by the present invention, after controlling the third circuit breaker to close, the method includes:

[0017] After the voltage and frequency of the first energy storage device are synchronized with the second energy storage device, the first circuit breaker of the first electrical device corresponding to the fifth circuit breaker that is closed is controlled to be closed, and the closed fifth circuit breaker is opened.

[0018] According to a hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid provided by the present invention, after controlling the third circuit breaker to close, the method includes:

[0019] The power supply of the second energy storage device is reduced to match the energy consumption of the second power-consuming device.

[0020] The present invention also provides a control device for a hybrid load energy storage system suitable for a hydrometallurgical plant microgrid, comprising:

[0021] a power-off instant control module, configured to control the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker and the third circuit breaker to be closed when the external power grid is powered off;

[0022] a first electric device control module, configured to control the opening and closing of the fifth circuit breaker corresponding to the first electric device based on a power outage priority of the first electric device, wherein the power outage priority reflects the degree of impact of the power outage of the first electric device on factory production;

[0023] The energy storage coordination module is used to control the closing of the third circuit breaker after the second energy storage device provides stable voltage and frequency support.

[0024] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for controlling a hybrid load energy storage system applicable to a microgrid of a hydrometallurgical plant as described above is implemented.

[0025] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for controlling a hybrid load energy storage system applicable to a microgrid of a hydrometallurgical plant as described above is implemented.

[0026] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-described methods for controlling a hybrid load energy storage system applicable to a microgrid of a hydrometallurgical plant.

[0027] The hybrid load energy storage system and control method for a microgrid in a wet smelting plant provided by the present invention divides the electrical equipment in the plant into first electrical equipment and second electrical equipment according to the electrical power priority. For the second electrical equipment with higher electrical power priority, a grid-forming second energy storage device is directly configured. For the first electrical equipment with lower electrical power priority, a conventional grid-connected and off-grid first energy storage device is directly configured. Each first electrical equipment is connected to the first energy storage device through a branch with a first circuit breaker, and each second electrical equipment is connected to the second energy storage device through a branch with a second circuit breaker. The first energy storage device is connected to the AC busbar through a branch with a third circuit breaker, and the second energy storage device is connected to the AC busbar through a branch with a fourth circuit breaker. The AC bus is connected to the external power grid. The first power-consuming equipment is connected to the AC bus through a branch of the fifth circuit breaker. The second power-consuming equipment is connected to the AC bus through a branch of the sixth circuit breaker. When the external power grid in the factory is disconnected from the power supply, the grid-connected energy storage equipment can be quickly started after the power outage by opening and closing each circuit breaker, providing voltage and frequency support for the factory power grid in a shorter period of time. At the same time, power supply is given priority to more important power-consuming equipment. After the grid-connected energy storage equipment provides stable power and frequency, the off-grid energy storage equipment is connected to the grid through the opening and closing of the circuit breaker to provide power support, thereby ensuring the production of the factory after the power supply of the external power grid in the factory is interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 The wiring principle of the hybrid load energy storage system for the microgrid of the hydrometallurgy plant provided by the present invention is Figure 1 .

[0030] Figure 2 The wiring principle of the hybrid load energy storage system for the microgrid of the hydrometallurgy plant provided by the present invention is Figure 2 .

[0031] Figure 3This is a flow chart of a control method for a hybrid load energy storage system applicable to a microgrid of a hydrometallurgical plant provided by the present invention.

[0032] Figure 4 It is a structural schematic diagram of a hybrid load energy storage system control device suitable for a hydrometallurgical plant microgrid provided by the present invention.

[0033] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following combination Figure 1 The hybrid load energy storage system provided by the present invention is applicable to the microgrid of a hydrometallurgical plant. Figure 1 As shown, the hybrid load energy storage system for a hydrometallurgical plant microgrid provided by the present invention includes a plurality of first power-consuming devices, a plurality of second power-consuming devices, a first energy storage device ( Figure 1 Conventional on-grid and off-grid energy storage equipment) and the second energy storage equipment ( Figure 1 The grid-type energy storage device in the plant). Among them, the first power-consuming device and the second power-consuming device are divided based on the power priority, and the power priority of the first power-consuming device is lower than that of the second power-consuming device. Specifically, according to the factory production process, the power-consuming devices included in the factory microgrid can be divided into the first power-consuming device and the second power-consuming device according to the power priority. The second power-consuming device is the production equipment that should be protected first in the factory process, and the first power-consuming device is the non-key protection equipment in production. In other words, the loss caused by the power failure of the first power-consuming device will be greater than the loss caused by the power failure of the second power-consuming device. Figure 2 As shown, in a wet smelting plant, the second electrical equipment can be large asynchronous motors, park control halls and control systems, electric arc furnaces and other equipment with strict requirements on temperature changes, transportation pipelines for key production materials and their associated pumps or fans, security systems and emergency shutdown systems in the production process within the park, etc. The first electrical equipment can be low-temperature electrolytic cells that do not have strict requirements on temperature changes and have a certain system inertia, auxiliary lighting equipment within the plant, air conditioning and ventilation pipelines and their associated fans / water coolers or heating equipment that have no direct impact on actual production, material transportation pipelines and their associated pumps or fans that have no serious impact on the factory production process after starting, stopping or reducing load, etc.

[0036] In the system provided by the present invention, the first electrical equipment can be connected to the first circuit breaker ( Figure 1 S16-S20 in the circuit breaker) are directly connected to the first energy storage device, and the second power-consuming device can be connected through the second circuit breaker ( Figure 1 In S4-S9 (in the example), the second energy storage device is directly connected. That is, the second power-consuming device is configured with grid-connected energy storage, while the first power-consuming device is configured with conventional on-grid and off-grid energy storage. Because grid-connected energy storage is relatively expensive, the system provided by this invention can reduce the initial investment and construction costs of energy storage systems within a factory.

[0037] Furthermore, the first energy storage device is provided with a third circuit breaker ( Figure 1 The branch of S2 in the circuit is connected to the AC bus, and the second energy storage device is connected to the AC bus by setting the fourth circuit breaker ( Figure 1 The branch of S3 in the circuit is connected to the AC busbar, and the first power-consuming equipment is connected to the AC busbar by setting the fifth circuit breaker ( Figure 1 The branch of S21-S25 in the circuit is connected to the AC bus, and the second power equipment is connected by setting the sixth circuit breaker ( Figure 1 The branches S10-S15 in the circuit are connected to the AC bus.

[0038] When the external power grid in a factory is cut off from power, the grid-connected energy storage device can be quickly started up first by opening and closing each circuit breaker, and dominate the power supply of the factory microgrid, providing voltage and frequency support for the factory power grid in a relatively short period of time, while giving priority to providing power supply to more important electrical equipment. After the grid-connected energy storage device provides stable power and frequency, the grid-connected and off-grid energy storage device can be integrated into the grid through the opening and closing of the circuit breaker to provide power support. The grid-connected energy storage device assists the startup and commissioning of conventional grid-connected and off-grid energy storage devices. The two cooperate with each other to effectively maintain the operation of important electrical equipment and other auxiliary machines in the factory, and ensure factory production after the external power grid is cut off.

[0039] The following combination Figure 3 The control method of the hybrid load energy storage system applicable to the microgrid of a hydrometallurgical plant provided by the present invention is described as follows: Figure 3 As shown, the control method of the hybrid load energy storage system applicable to the microgrid of a hydrometallurgical plant provided by the present invention includes the following steps:

[0040] S310: When the external power grid is powered off, control the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker and the third circuit breaker to be closed;

[0041] S320: Controlling the opening and closing of a fifth circuit breaker corresponding to the first electrical device based on a power outage priority of the first electrical device, where the power outage priority reflects the degree of impact of the power outage of the first electrical device on factory production;

[0042] S330: After the second energy storage device provides stable voltage and frequency support, control the third circuit breaker to close.

[0043] like Figure 1 As shown, a circuit breaker is installed between the AC busbar and the external grid. When the external grid is not shut down, this circuit breaker is closed. By controlling the opening and closing of the remaining circuit breakers, various electrical devices within the factory microgrid are directly powered by the external grid via the AC busbar. That is, when the external grid is not shut down, the third, fourth, fifth, and sixth circuit breakers remain closed, while the first and second circuit breakers remain open. When the external grid is not shut down, the first and second energy storage devices are charged.

[0044] In the event of a power outage, the circuit breaker between the AC busbar and the external grid is immediately disconnected. The third and sixth circuit breakers are immediately opened, while the second and third circuit breakers remain closed. This allows the second energy storage device to quickly begin supplying power, ensuring the operation of the second power consumer. The first power consumer can be powered off, partially shut down, or continue operating, depending on the actual situation.

[0045] Specifically, controlling the opening and closing of the fifth circuit breaker corresponding to the first electrical equipment based on the power-off priority of the first electrical equipment includes:

[0046] When the power-off priority of the first electrical equipment is the first power-off priority, controlling the fifth circuit breaker corresponding to the first electrical equipment to close, and controlling the first electrical equipment to reduce the load within the process requirements;

[0047] When the power-off priority of the first electrical device is the second power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to close, and controlling the first electrical device to partially shut down;

[0048] When the power-off priority of the first electrical device is the third power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to open;

[0049] The impact of power outage of electrical equipment corresponding to the first power outage priority on production is greater than that of the second power outage priority, and the impact of power outage of electrical equipment corresponding to the second power outage priority on production is greater than that of the third power outage priority.

[0050] like Figure 2As shown, for equipment with low sensitivity to power fluctuations and a certain degree of inertia, such as low-temperature electrolyzers, the first priority for power outages can be considered. Within the scope of process requirements, these equipment can be reduced to the minimum load, with their corresponding fifth circuit breaker kept closed, allowing them to draw power from the second energy storage device. For equipment that can be partially shut down, such as auxiliary lighting, the second priority for power outages can be considered. The corresponding fifth circuit breaker remains closed and the equipment is shut down according to the minimum baseline standard. Although it can draw power from the second energy storage device, the amount of power drawn is limited. For example, for auxiliary lighting, a portion of basic lighting can be reserved to maintain normal factory operations, while the remaining lighting is shut down. For equipment whose shutdown has no impact on production, such as building air conditioners, the third priority for power outages can be considered. The corresponding fifth circuit breaker of the controller is opened, preventing it from drawing power from the second energy storage device. By further categorizing the first power-consuming equipment, factory production can be effectively guaranteed when power is supplied by the second energy storage device during a power outage.

[0051] The second energy storage device can quickly provide power supply to the factory microgrid. After establishing stable voltage and frequency support on the second energy storage device, that is, after the voltage and frequency output fluctuation of the second energy storage device is lower than the preset set value, the third circuit breaker is closed. In this way, the first energy storage device can obtain the basic voltage and frequency reference, so that it can perform corresponding voltage and frequency output.

[0052] After controlling the third circuit breaker to close, the control method provided by the present invention further includes:

[0053] After the voltage and frequency of the first energy storage device are synchronized with the second energy storage device, the first circuit breaker of the first electrical device corresponding to the fifth circuit breaker that is closed is controlled to be closed, and the closed fifth circuit breaker is opened.

[0054] When the first energy storage device synchronizes to produce the same voltage and frequency as the second energy storage device, the fifth circuit breaker corresponding to the first electrical device that is drawing power from the second energy storage device through the AC bus is opened, and the first circuit breaker directly connected to the first energy storage device is closed.

[0055] Furthermore, when the first energy storage device synchronizes to produce a voltage and frequency consistent with the second energy storage device, since the first energy storage device can participate in power supply, the power supply power of the second energy storage device can be reduced so that the power supply frequency domain of the second energy storage device matches the energy consumption of the second power-consuming device, thereby prioritizing the supply of power from the second energy storage device to the second power-consuming device.

[0056] After the first energy storage device stabilizes, the power consumption status of the first electrical devices can be adjusted. Specifically, the power consumption status of the first electrical devices with a first power-off priority level is adjusted first, controlling these first-priority devices to increase their load and operate normally. Depending on the energy reserve of the first energy storage device, the first electrical devices with a second power-off priority level that were shut down can be restored. Finally, if there is still power reserve in the first energy storage device, the first circuit breakers of all or some of the first electrical devices with a third power-off priority level can be closed.

[0057] The method provided by the present invention activates the grid-connected energy storage device when the factory's external power grid is cut off, partially shuts down the first power-consuming equipment or reduces its operating power, and waits for the grid-connected energy storage device to establish voltage and frequency support in accordance with the frequency coordination waiting mechanism of the on-grid and off-grid energy storage devices led by the grid-connected energy storage device. After the grid-connected energy storage device has established its voltage and frequency support, conventional on-grid and off-grid energy storage devices are put into use, and the power of the first power-consuming equipment is gradually restored as needed. During this process, step-by-step control is performed according to the power reduction mechanism of the first power-consuming equipment and the synchronous power increase mechanism of the on-grid and off-grid energy storage devices. Ultimately, under the basic conditions such as the power and capacity of the configured overall energy storage device, the factory achieves maximum efficiency operation while waiting for the external power grid to resume power supply.

[0058] The hybrid load energy storage system control device applicable to the hydrometallurgical plant microgrid provided by the present invention is described below. The hybrid load energy storage system control device applicable to the hydrometallurgical plant microgrid described below and the hybrid load energy storage system control method applicable to the hydrometallurgical plant microgrid described above can be referred to each other. Figure 4 As shown, the hybrid load energy storage system control device applicable to the microgrid of a hydrometallurgical plant provided by the present invention includes the following modules:

[0059] The power failure instant control module 410 is used to control the third circuit breaker and the sixth circuit breaker to open and the second circuit breaker and the third circuit breaker to close when the external power grid fails;

[0060] A first electrical equipment control module 420 is configured to control the opening and closing of a fifth circuit breaker corresponding to the first electrical equipment based on a power outage priority of the first electrical equipment, wherein the power outage priority reflects the degree of impact of the power outage of the first electrical equipment on factory production;

[0061] The energy storage coordination module 430 is used to control the closing of the third circuit breaker after the second energy storage device provides stable voltage and frequency support.

[0062] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5As shown, the electronic device may include: a processor 510, a communications interface 520, a memory 530, and a communications bus 540, wherein the processor 510, the communications interface 520, and the memory 530 communicate with each other via the communications bus 540. The processor 510 may call logic instructions in the memory 530 to execute a hybrid load energy storage system control method applicable to a hydrometallurgical microgrid. The method includes: when the external power grid is out of power, controlling the third and sixth circuit breakers to open, and the second and third circuit breakers to close; controlling the opening and closing of the fifth circuit breaker corresponding to the first power consumer based on the power outage priority of the first power consumer, where the power outage priority reflects the degree of impact of the power outage of the first power consumer on factory production; and controlling the closing of the third circuit breaker after the second energy storage device provides stable voltage and frequency support.

[0063] Furthermore, the logic instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0064] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the hybrid load energy storage system control method suitable for a wet smelting plant microgrid provided by the above methods. The method includes: when the external power grid is out of power, controlling the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker and the third circuit breaker to be closed; based on the power outage priority of the first power user, controlling the opening and closing of the fifth circuit breaker corresponding to the first power user, the power outage priority reflects the degree of impact of the power outage of the first power user on the factory production; when the second energy storage device provides stable voltage and frequency support, controlling the third circuit breaker to be closed.

[0065] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the hybrid load energy storage system control method suitable for a wet smelting plant microgrid provided by the above-mentioned methods, the method comprising: when the external power grid is out of power, controlling the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker and the third circuit breaker to be closed; controlling the opening and closing of the fifth circuit breaker corresponding to the first power user based on the power outage priority of the first power user, the power outage priority reflecting the degree of impact of the power outage of the first power user on the factory production; and controlling the third circuit breaker to be closed after the second energy storage device provides stable voltage and frequency support.

[0066] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0067] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A control method for a hybrid load energy storage system suitable for a hydrometallurgical plant microgrid, characterized in that: The hybrid load energy storage system includes: a plurality of first power-consuming devices, a plurality of second power-consuming devices, a first energy storage device, and a second energy storage device, wherein the power priority of the first power-consuming devices is lower than the power priority of the second power-consuming devices, the first energy storage device is an on-grid or off-grid energy storage device, and the second energy storage device is a grid-connected energy storage device; Each of the first electrical devices is connected to the first energy storage device via a branch provided with a first circuit breaker, and each of the second electrical devices is connected to the second energy storage device via a branch provided with a second circuit breaker. The first energy storage device is connected to the AC bus via a branch provided with a third circuit breaker, and the second energy storage device is connected to the AC bus via a branch provided with a fourth circuit breaker. The AC bus is connected to the external power grid. The first electrical device is connected to the AC bus via a branch provided with a fifth circuit breaker, and the second electrical device is connected to the AC bus via a branch provided with a sixth circuit breaker. The method comprises: When the external power grid is powered off, controlling the third circuit breaker and the sixth circuit breaker to be opened, and the second circuit breaker to be closed; controlling the opening and closing of the fifth circuit breaker corresponding to the first electrical device based on the power outage priority of the first electrical device, wherein the power outage priority reflects the degree of impact of the power outage of the first electrical device on factory production; After the second energy storage device provides stable voltage and frequency support, the third circuit breaker is controlled to close.

2. The hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid according to claim 1 is characterized in that: When the external power grid is not powered off, the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker, and the sixth circuit breaker are kept closed, and the first circuit breaker and the second circuit breaker are kept open.

3. The hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid according to claim 1, characterized in that: The controlling the opening and closing of the fifth circuit breaker corresponding to the first electrical device based on the power-off priority of the first electrical device includes: When the power-off priority of the first electrical device is the first power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to close, and controlling the first electrical device to reduce the load within the process requirement; When the power-off priority of the first electrical device is the second power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to close, and controlling the first electrical device to partially shut down; When the power-off priority of the first electrical device is the third power-off priority, controlling the fifth circuit breaker corresponding to the first electrical device to open; The impact of power outage of the electrical equipment corresponding to the first power outage priority on production is greater than that of the second power outage priority, and the impact of power outage of the electrical equipment corresponding to the second power outage priority on production is greater than that of the third power outage priority.

4. The hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid according to claim 1, characterized in that: After controlling the third circuit breaker to close, the method further comprises: After the voltage and frequency of the first energy storage device are synchronized with the second energy storage device, the first circuit breaker of the first electrical device corresponding to the fifth circuit breaker that is closed is controlled to be closed, and the closed fifth circuit breaker is opened.

5. The hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid according to claim 1, characterized in that: After controlling the third circuit breaker to close, the method further comprises: The power supply of the second energy storage device is reduced to match the energy consumption of the second power-consuming device.

6. A control device for a hybrid load energy storage system suitable for a hydrometallurgical plant microgrid, characterized in that: The hybrid load energy storage system includes: a plurality of first power-consuming devices, a plurality of second power-consuming devices, a first energy storage device, and a second energy storage device, wherein the power priority of the first power-consuming devices is lower than the power priority of the second power-consuming devices, the first energy storage device is an on-grid or off-grid energy storage device, and the second energy storage device is a grid-connected energy storage device; Each of the first electrical devices is connected to the first energy storage device via a branch provided with a first circuit breaker, and each of the second electrical devices is connected to the second energy storage device via a branch provided with a second circuit breaker. The first energy storage device is connected to the AC bus via a branch provided with a third circuit breaker, and the second energy storage device is connected to the AC bus via a branch provided with a fourth circuit breaker. The AC bus is connected to the external power grid. The first electrical device is connected to the AC bus via a branch provided with a fifth circuit breaker, and the second electrical device is connected to the AC bus via a branch provided with a sixth circuit breaker. The device comprises: a power-off instant control module, configured to control the third circuit breaker and the sixth circuit breaker to open and the second circuit breaker to close when the external power grid is powered off; a first electric device control module, configured to control the opening and closing of the fifth circuit breaker corresponding to the first electric device based on a power outage priority of the first electric device, wherein the power outage priority reflects the degree of impact of the power outage of the first electric device on factory production; The energy storage coordination module is used to control the closing of the third circuit breaker after the second energy storage device provides stable voltage and frequency support.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the hybrid load energy storage system control method applicable to the microgrid of a hydrometallurgical plant as described in any one of claims 1 to 5 is implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid as described in any one of claims 1 to 5 is implemented.

9. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the hybrid load energy storage system control method applicable to a hydrometallurgical plant microgrid as described in any one of claims 1 to 5 is implemented.

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