Microgrid control method and device for hydrometallurgy plant based on energy storage inverter

Abstract

The present invention provides a hydrometallurgical plant microgrid control method and device based on an energy storage inverter, relating to the field of microgrid technology. The energy storage inverter includes an energy storage unit, a first AC-DC converter, and an inverter. The input of the first AC-DC converter is connected to an external power grid via an AC bus with a first circuit breaker between it and the external power grid. The input of the inverter is connected to the output of the first AC-DC converter, and the output is connected to a variable frequency motor. The energy storage unit is connected between the output of the first AC-DC converter and the input of the inverter via a branch with a second circuit breaker. The energy storage unit and renewable energy are connected to the DC bus, and the AC bus and the DC bus are connected via a second branch provided with a second AC-DC converter. The method includes: controlling the opening and closing of the first circuit breaker and the second circuit breaker based on frequency change data of the AC bus in the factory microgrid. The present invention can improve the stability of the production and operation of frequency conversion equipment within the factory.

Description

Technical Field

[0001] The present invention relates to the field of microgrids, and in particular to a microgrid control method and device for a hydrometallurgical plant based on an energy storage inverter. Background Art

[0002] If the power grid in a factory's region is unreliable, such as due to frequent power outages, fault shocks, and frequency fluctuations, causing power outages in the factory, this can have a significant impact on the factory's large-scale variable frequency equipment. For example, large rotary power equipment such as ball mills in a hydrometallurgical plant require a long soft start after a power outage. During this time, the equipment must be cranked, the variable frequency motor engaged, the equipment accelerated, and then put into production under load. During this process, the operating status of the equipment during the startup phase must be continuously monitored and adjusted. Furthermore, these large-scale equipment have significant inertia during startup, requiring high energy consumption. In short, poor regional power grid reliability can seriously impact the production and operation of the factory's variable frequency equipment. Summary of the Invention

[0003] The present invention provides a microgrid control method and device for a wet smelter based on an energy storage inverter, which is used to solve the problem in the prior art that poor reliability of the regional power grid seriously affects the production and operation of the frequency conversion equipment in the factory, and achieves the effect of improving the production and operation stability of the frequency conversion equipment in the factory.

[0004] The present invention provides a hydrometallurgical plant microgrid control method based on an energy storage inverter. The energy storage inverter includes an energy storage unit, a first AC-DC converter, and an inverter. The input end of the first AC-DC converter is connected to an external power grid via an AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to a variable frequency motor. The energy storage unit is connected between the output end of the first AC-DC converter and the input end of the inverter via a branch, and a second circuit breaker is provided on the branch. The energy storage unit and renewable energy are both connected to the DC bus. The AC bus and the DC bus are connected via a second branch, and a second AC-DC converter is provided on the second branch.

[0005] The method comprises:

[0006] Detecting frequency changes of the AC bus in the factory microgrid to obtain frequency change data;

[0007] The first circuit breaker and the second circuit breaker are controlled to be opened and closed based on the frequency change data.

[0008] According to a hydrometallurgical smelter microgrid control method based on an energy storage inverter provided by the present invention, the control of opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data includes:

[0009] When the detected frequency change data is within a preset first range, controlling the first circuit breaker to remain on and the second circuit breaker to remain off;

[0010] When the detected frequency change data is within a preset second range, detecting the power level of the energy storage unit, and controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the detection result, the frequency change degree corresponding to the second range being greater than the frequency change degree corresponding to the first range;

[0011] When the detected frequency change data is within a preset third range, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be connected, and the frequency change degree corresponding to the third range is greater than the frequency change degree corresponding to the second range.

[0012] According to a hydrometallurgical smelter microgrid control method based on an energy storage inverter provided by the present invention, the control of opening and closing of the first circuit breaker and the second circuit breaker based on the detection result includes:

[0013] When the detection result shows that the power of the energy storage unit meets the power demand of the variable frequency motor within a preset time, the first circuit breaker is controlled to remain on, the second circuit breaker is controlled to remain off, and the generator in the factory microgrid is controlled to standby;

[0014] When the detection result shows that the power of the energy storage unit does not meet the power demand of the variable frequency motor within the preset time, the opening and closing of the first circuit breaker and the second circuit breaker are controlled based on the frequency margin of the generator in the factory microgrid.

[0015] According to a hydrometallurgical plant microgrid control method based on an energy storage inverter provided by the present invention, the switching of the first circuit breaker and the second circuit breaker is controlled based on the frequency margin of the generator in the plant microgrid, including:

[0016] When the generator in the factory microgrid has a frequency margin and the frequency margin meets the power requirement of the variable frequency motor, controlling the first circuit breaker to remain on and the second circuit breaker to remain off;

[0017] When the generator in the factory microgrid has a frequency margin but the frequency margin does not meet the power requirement of the variable frequency motor, and the energy storage unit has stored energy, the first circuit breaker and the second circuit breaker are controlled to remain on, so that the generator in the factory microgrid and the energy storage inverter are cross-synchronized to supply power;

[0018] When the generator in the factory microgrid has no frequency margin and the output of the renewable energy meets the operating power requirement of the variable frequency motor in the current period, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be connected, so that the renewable energy supplies power to the variable frequency motor through the energy storage unit;

[0019] When the generator in the factory microgrid has no frequency margin, the energy storage unit has no stored energy, and the output of the renewable energy does not meet the operating power requirement of the variable frequency motor in the current period, the load of other electrical equipment in the factory microgrid is controlled or the variable frequency motor is controlled to shut down based on the feasibility of load reduction of other electrical equipment in the factory microgrid.

[0020] According to a microgrid control method for a hydrometallurgical plant based on an energy storage inverter provided by the present invention, the method further includes:

[0021] Based on the power demand of other electrical equipment in the factory microgrid except the variable frequency motor, the power supply priority in the factory microgrid is determined, and the power output change of the energy storage unit and / or the power output change of the generator in the factory microgrid is controlled based on the power supply priority.

[0022] According to a microgrid control method for a hydrometallurgical plant based on an energy storage inverter provided by the present invention, the method further includes:

[0023] Detecting the variable frequency motor control information;

[0024] When the control information of the variable frequency motor reflects that the control frequency of the variable frequency motor is greater than a frequency threshold, the first circuit breaker and the second circuit breaker are controlled to remain on.

[0025] The present invention also provides a hydrometallurgical plant microgrid control device based on an energy storage inverter. The energy storage inverter includes an energy storage unit, a first AC-DC converter, and an inverter. The input end of the AC-DC converter is connected to an external power grid through an AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to a variable frequency motor. The energy storage unit is connected between the output end of the AC-DC converter and the input end of the inverter through a branch. A second circuit breaker is provided on the branch. The energy storage unit and renewable energy are both connected to the DC bus. The AC bus and the DC bus are connected through a second branch. A second AC-DC converter is provided on the second branch.

[0026] The device comprises:

[0027] A data acquisition module, configured to detect frequency changes of the AC bus in the factory microgrid and obtain frequency change data;

[0028] A control module is configured to control the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data.

[0029] 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 microgrid control method for a hydrometallurgical plant based on an energy storage inverter as described above is implemented.

[0030] 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 microgrid control method for a hydrometallurgical plant based on an energy storage inverter as described above is implemented.

[0031] 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 hydrometallurgical plant microgrid based on an energy storage inverter.

[0032] The present invention provides a hydrometallurgical plant microgrid control method and device based on an energy storage inverter. The energy storage inverter includes an energy storage unit, a first AC-DC converter and an inverter. The input end of the first AC-DC converter is connected to the external power grid through an AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to the variable frequency motor. The energy storage unit is connected between the output end of the first AC-DC converter and the input end of the inverter through a branch. A second circuit breaker is provided on the branch. The energy storage unit and renewable energy are both connected to the DC bus. The AC bus and the DC bus are connected through a second branch. A second AC-DC converter is provided on the second branch. The frequency change of the AC bus is detected to obtain frequency change data, and the opening and closing of the first circuit breaker and the second circuit breaker are controlled based on the frequency change data. The present invention adds an energy storage inverter to the factory power grid and actively monitors the frequency changes of the factory microgrid. The first circuit breaker and the second circuit breaker in the energy storage inverter can be opened and closed according to the actual situation of the power grid. When frequency fluctuations or power outages occur on the AC bus, the energy storage inverter promptly switches to the inverter working mode, releasing the stored energy to power the variable frequency motor, thereby improving the production and operation stability of the variable frequency equipment in the factory microgrid. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 It is a flow chart of the microgrid control method for a hydrometallurgical plant based on an energy storage inverter provided by the present invention.

[0035] Figure 2 This is a wiring schematic diagram of the energy storage inverter in the microgrid control method for a hydrometallurgical plant based on the energy storage inverter provided by the present invention.

[0036] Figure 3 It is a structural schematic diagram of a hydrometallurgical plant microgrid control device based on an energy storage inverter provided by the present invention.

[0037] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] The following combination Figure 1-2 The present invention describes the method for controlling a hydrometallurgical plant microgrid based on an energy storage inverter. In the method for controlling a hydrometallurgical plant microgrid based on an energy storage inverter, the energy storage inverter and renewable energy (such as photovoltaic power, wind power, etc.) are connected. The renewable energy and the energy storage unit are combined to provide power supply for the factory microgrid. The wiring schematic diagram of the energy storage inverter in the method for controlling a hydrometallurgical plant microgrid based on an energy storage inverter provided by the present invention is shown in FIG. Figure 2 As shown. The energy storage inverter includes an energy storage unit, a first AC-DC converter (to achieve AC-DC conversion) and an inverter (to achieve DC-AC conversion). The input end of the first AC-DC converter is connected to the external power grid (for example, the park power grid of the park where the factory is located) through the AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to the variable frequency motor. The energy storage unit is connected between the output end of the first AC-DC converter and the input end of the inverter through a branch. A second circuit breaker is provided on the branch. The energy storage unit and renewable energy are both connected to the DC bus. The AC bus and the DC bus are connected through a second branch. A second AC-DC converter is provided on the second branch. The method provided by the present invention can be executed by an active detection unit connected to an energy storage inverter. The active detection unit is connected to the energy storage inverter to form a network-type energy storage inverter. The active detection unit can detect frequency changes in the factory microgrid in real time, provide grid operation status monitoring for the energy storage unit, provide real-time data support for its network construction, and also determine the switching status of the energy storage unit. When the factory's external power grid is restricted, the imbalance between the power-consuming equipment and the power supply will cause frequency fluctuations on the rated AC bus in the factory microgrid. At this time, after detection by the active detection unit, the network-type energy storage inverter can be directly converted from the normal operating mode to the inverter operating mode, releasing the stored energy to power the variable frequency motor, reducing the length of the power supply gap period.

[0040] like Figure 1 As shown, the hydrometallurgical plant microgrid control method based on energy storage inverter provided by the present invention includes the following steps:

[0041] S110, detecting a frequency change of an AC bus in a factory microgrid and obtaining frequency change data;

[0042] S120 : Control opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data.

[0043] The method provided by the present invention provides control instructions for energy storage inverters suitable for different conditions based on the different power supply architectures and operating modes that may exist in a factory microgrid, thereby improving the operating capacity and applicability of the energy storage inverters. Specifically, controlling the opening and closing of the first circuit breaker and the second circuit breaker based on frequency change data includes:

[0044] When the detected frequency change data is within a preset first range, controlling the first circuit breaker to remain on and the second circuit breaker to remain off;

[0045] When the detected frequency change data is within a preset second range, the power level of the energy storage unit is detected, and the opening and closing of the first circuit breaker and the second circuit breaker are controlled based on the detection result, and the frequency change degree corresponding to the second range is greater than the frequency change degree corresponding to the first range;

[0046] When the detected frequency change data is within a preset third range, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be connected, and the frequency change degree corresponding to the third range is greater than the frequency change degree corresponding to the second range.

[0047] The method provided by the present invention uses different frequency change nodes as constraints for controlling the operating state of the energy storage inverter. The frequency change nodes can be represented by three ranges. The settings of the first, second, and third ranges can be set based on the actual power grid conditions. In one possible implementation, the first range can be between ±0.2 Hz, the second range can be between ±0.2-0.5 Hz, and the third range can be outside ±0.5 Hz.

[0048] When the frequency change data is within a preset first range, the first circuit breaker is turned on and the second circuit breaker is opened. At this time, the energy storage unit of the energy storage inverter relies on the DC bus for charging or standby operation, and the energy storage capacity of the energy storage unit is controlled to be above 50% of the total capacity as much as possible.

[0049] When the frequency change data is within the preset third range, it indicates that there is a power system fault in the factory microgrid, and the voltage and frequency of the external power grid may not meet the subsequent variable frequency motor operation requirements. At this time, the first circuit breaker should be opened quickly and the second circuit breaker should be turned on. The energy storage unit should be used to supply power to the inverter and frequency conversion equipment. At the same time, the current real-time variable frequency power grid power data is read in the frequency conversion control system to control the power output of the energy storage unit and achieve the functional transition of the variable frequency motor with as little fluctuation and delay time as possible.

[0050] When the frequency change data is within a preset second range, the power of the variable frequency motor is detected by the variable frequency motor power detection signal in the variable frequency control system, and the power in the energy storage unit is verified by the control system of the energy storage unit. The opening and closing of the first circuit breaker and the second circuit breaker are controlled according to the power detection result, specifically including:

[0051] Control the first circuit breaker to remain on, the second circuit breaker to remain off, and control the generator in the factory microgrid to standby;

[0052] When the detection result shows that the power of the energy storage unit does not meet the power demand of supporting the variable frequency motor within a preset time, the opening and closing of the first circuit breaker and the second circuit breaker are controlled based on the frequency margin of the generator in the factory microgrid.

[0053] The preset duration is a short period, such as 3-5 minutes. When the frequency change data is within the second range, preparations must be made for the situation where the AC bus frequency data continues to fluctuate and the frequency change data falls within the third range. First, maintain the first circuit breaker on and the second circuit breaker off. Based on the current operating parameters of the factory's self-contained power generation system (including at least one generator), an appropriate number of generators are prepared for standby operation. Due to the short delay time of the energy storage inverter, generators can be quickly activated when the external grid is unable to directly supply power, ensuring the normal operation of the variable-frequency motor. Due to the delay time period of the energy storage inverter, it is particularly suitable for instantaneous protection of the variable-frequency generator set when the factory microgrid frequency drops due to an external grid power outage. Therefore, when the frequency change data is within the second range, the output of renewable energy should be adjusted to prioritize powering the energy storage unit. This ensures that the energy storage inverter contains at least enough energy to supply the variable-frequency motor for the preset duration, providing the necessary intermediate transition for the subsequent startup of the generator in the factory's self-contained power generation system.

[0054] If it is detected that the power of the energy storage unit does not meet the power demand of the variable frequency motor within the preset time, that is, it cannot provide short-term stable power support for the variable frequency motor, there will be multiple operating conditions based on the frequency margin of the generator in the factory microgrid, which are explained below.

[0055] Controlling the opening and closing of a first circuit breaker and a second circuit breaker based on a frequency margin of a generator in a factory microgrid includes:

[0056] When the generator in the factory microgrid has a frequency margin and the frequency margin meets the power requirement of the variable frequency motor, the first circuit breaker is controlled to remain on and the second circuit breaker is controlled to remain off;

[0057] When the generator in the factory microgrid has frequency margin, but the frequency margin does not meet the power requirement of the variable frequency motor, and the energy storage unit has energy storage capacity, the first circuit breaker and the second circuit breaker are controlled to remain on, so that the generator and the energy storage inverter in the factory microgrid can be cross-synchronized to supply power;

[0058] When the generator in the factory microgrid has no frequency margin and the output of renewable energy meets the operating power requirements of the variable frequency motor in the current period, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be turned on, so that the renewable energy can supply power to the variable frequency motor through the energy storage unit.

[0059] The first operating condition is that the factory's self-contained generator has been prepared or the existing generator still has a certain amount of power generation reserve, which can directly increase the power to supply power to the variable frequency motor and meet the power requirements of the variable frequency motor. The first circuit breaker can be controlled to remain on and the second circuit breaker can remain off. When the power is off, the first circuit breaker can also be kept on and the second circuit breaker can be kept off. The generator directly increases the power to supply power to the variable frequency motor.

[0060] The second operating condition is that the factory's self-contained generator has been prepared or the existing generator still has a certain amount of power generation reserve, but cannot fully meet the power requirements of the variable frequency motor under this operating condition, and the energy storage unit still has some energy storage capacity. In this case, the first circuit breaker and the second circuit breaker can be turned on at the same time to achieve cross-synchronous power supply of the generator and the energy storage inverter. However, at this time, the balance of the generator and energy storage output should be strictly controlled to ensure voltage balance.

[0061] The third operating condition is when the factory's own generator is not ready or the existing generator has no remaining power, but the renewable energy processing is capable of meeting the operating power requirements of the variable frequency motor during that period. In this case, the first circuit breaker can be quickly controlled to disconnect and the second circuit breaker to conduct. The energy storage unit outputs the power of the renewable energy to the variable frequency motor through the second circuit breaker.

[0062] The fourth operating condition is that the factory's own generator is not ready or the existing generator has no power reserve, and the energy storage unit has no energy storage capacity, and renewable energy cannot provide a stable and reliable power supply (for example, there is no photovoltaic power generation at night or on rainy days, and the wind power output is 0 or has large power fluctuations). At this time, it should be determined whether other electrical equipment in the factory can operate at a reduced load. If so, the power of other electrical equipment in the factory should be appropriately reduced to provide basic power supply guarantee for the variable frequency motor. If not, the variable frequency motor should be controlled to shut down.

[0063] Under the first, second, and third operating conditions mentioned above, if the factory's own generator experiences frequency fluctuations, the power output of the energy storage unit should be adjusted in a timely manner.

[0064] It can be seen that the method provided by the present invention detects the frequency output and frequency conditions of power sources such as an external power grid or a factory's own generator, and provides the energy storage inverter with factory microgrid characteristic data in real time according to the operating status of the factory microgrid's power system, providing data support for the energy storage inverter to supply power to the selected factory, and further adjusts the output according to the scheduling and energy surplus in the energy storage unit, so that the working state of the variable frequency motor can meet the requirements of the current production link as much as possible.

[0065] The energy storage inverter in the method provided by the present invention is configured for a variable frequency motor. Other electrical equipment in the factory is connected to a DC or AC bus. Although other electrical equipment in the factory is not connected to the energy storage inverter, the power demand of other electrical equipment in the factory will affect the power distribution of the external power grid and the generator, thereby affecting the variable frequency motor. Considering the power demand of other electrical equipment in the factory during actual operation, the power supplied to other electrical equipment in the factory can be provided to the variable frequency motor in different situations. Based on this, the method provided by the present invention also determines the power supply priority in the factory microgrid based on the power demand of other electrical equipment in the factory microgrid except the variable frequency motor, and controls the power output change of the energy storage unit and / or the power output change of the generator in the factory microgrid based on the power supply priority.

[0066] Specifically, when the adjustable margin of other electrical equipment in the factory is less than the first preset threshold, that is, the adjustable margin is small, in order to ensure the normal operation of the variable frequency motor and other electrical equipment, the factory microgrid should be controlled to operate with the first priority strategy. The first priority corresponds to the priority energy storage supply, so that the generator in the factory microgrid can be mainly used to ensure the operation of other electrical equipment. At this time, the control instruction of the power output change of the energy storage unit is as follows:

[0067]

[0068] Where ΔP st-en Indicates the power output change of the energy storage unit, ΔP di-ge Indicates the change in generator power output in kW, ΔP va-f-m It represents the actual change in the power of the variable frequency motor in kW, s represents the Laplace operator, and T represents the time constant of the saturation filter.

[0069] When the adjustable margin of other electrical equipment in the factory is greater than the second preset threshold, that is, the adjustable margin is large, but the battery capacity of the energy storage unit is insufficient, the second priority strategy should be used to ensure the normal operation of the variable frequency motor and other electrical equipment. The second priority corresponds to the priority generator supply. At this time, the generator power output change control instruction is detailed in the following formula:

[0070]

[0071] When the adjustable threshold of other electrical equipment in the factory is greater than the first preset threshold and less than the second preset threshold, that is, the adjustable margin is moderate, the battery of the energy storage unit has a certain capacity, and the renewable energy has a relatively stable working output, the renewable energy can be connected synchronously. Under the condition of ensuring the normal operation of the variable frequency motor and other electrical equipment, the third priority strategy is used for operation. The third priority corresponds to the same priority of energy storage supply and generator supply. At this time, the control instructions for the power output change of the energy storage unit and the generator are detailed in the following formula:

[0072]

[0073] P st-en +P di-ge +P re =P va-f-m ;

[0074] Where ΔP re Indicates the power output change of renewable energy power generation system, in kW, P st-en Indicates the actual power supply of the energy storage unit after calculation, in kW, P di-ge Indicates the actual power supply of the generator after calculation, in kW, P re It represents the actual power supply of the renewable energy power generation system, in kW.

[0075] The variable frequency motor in the method provided by the present invention can be a variable frequency motor of a large-scale equipment such as a ball mill. The operating state of the variable frequency motor of such equipment usually does not have frequent regulation. It can be seen from the above description that the method provided by the present invention can control the frequency output of each power supply source in the microgrid according to the operating state of the external power grid, the factory's own generator and the variable frequency motor when the variable frequency motor (such as the motor of the ball mill) is soft-start or variable frequency running, thereby ensuring the stable operation of the variable frequency motor. Furthermore, the variable frequency motor in the method provided by the present invention can be a motor of an equipment that is subject to frequent regulation (such as a semi-autonomous device, etc.). Through the method provided by the present invention, the power disturbance caused to the power grid by the frequent regulation of the variable frequency motor connected to the power grid can also be reduced. Specifically, during the normal operation of the factory microgrid, the variable frequency motor regulation information is detected; when the regulation information of the variable frequency motor reflects that the regulation frequency of the variable frequency motor is greater than the frequency threshold, the first circuit breaker and the second circuit breaker are controlled to remain on. In this way, energy storage can be used to fine-tune the frequent operation and regulation of variable-frequency motors (similar to the cross-function in the second working condition mentioned above), without having to control the power grid outside the energy storage inverter to participate in the regulation, thereby improving the grid stability when the variable-frequency motors in the factory microgrid are frequently regulated.

[0076] The following describes the hydrometallurgical plant microgrid control device based on the energy storage inverter provided by the present invention. The hydrometallurgical plant microgrid control device based on the energy storage inverter described below and the hydrometallurgical plant microgrid control method based on the energy storage inverter described above can be referred to each other. Figure 3 As shown, the hydrometallurgical plant microgrid control device based on energy storage inverter provided by the present invention includes the following modules:

[0077] The data acquisition module 310 is used to detect the frequency change of the AC bus in the factory microgrid and obtain frequency change data;

[0078] The control module 320 is configured to control the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data.

[0079] Figure 4 An example of a physical structure diagram of an electronic device is shown below. Figure 4 As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other via the communication bus 440. The processor 410 may call logic instructions in the memory 430 to execute a hydrometallurgical plant microgrid control method based on an energy storage inverter, the method comprising: detecting frequency changes of an AC bus in the plant microgrid to obtain frequency change data; and controlling the opening and closing of a first circuit breaker and a second circuit breaker based on the frequency change data.

[0080] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0081] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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 hydrometallurgical plant microgrid control method based on the energy storage inverter provided by the above methods. The method includes: detecting the frequency change of the AC bus in the factory microgrid to obtain frequency change data; and controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data.

[0082] On the other hand, 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, it is implemented to execute the hydrometallurgical plant microgrid control method based on the energy storage inverter provided by the above methods. The method includes: detecting the frequency change of the AC bus in the factory microgrid to obtain frequency change data; and controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data.

[0083] 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.

[0084] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0085] 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 microgrid control method for a hydrometallurgical plant based on an energy storage inverter, characterized in that: The energy storage inverter includes an energy storage unit, a first AC-DC converter and an inverter. The input end of the first AC-DC converter is connected to the external power grid through an AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to the variable frequency motor. The energy storage unit is connected between the output end of the first AC-DC converter and the input end of the inverter through a branch. A second circuit breaker is provided on the branch. The energy storage unit and the renewable energy power generation system are both connected to the DC bus. The AC bus and the DC bus are connected through a second branch. A second AC-DC converter is provided on the second branch. The method comprises: detecting a frequency change of the AC bus in the hydrometallurgical smelter microgrid to obtain frequency change data; controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data; The controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data includes: When the detected frequency change data is within a preset first range, controlling the first circuit breaker to remain on and the second circuit breaker to remain off; When the detected frequency change data is within a preset second range, detecting the power level of the energy storage unit, and controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the detection result, the frequency change degree corresponding to the second range being greater than the frequency change degree corresponding to the first range; When the detected frequency change data is within a preset third range, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be connected, and the frequency change degree corresponding to the third range is greater than the frequency change degree corresponding to the second range; When the adjustable margin of other user equipment in the hydrometallurgical smelter is less than a first preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a first priority strategy, where the first priority corresponds to priority energy storage supply. At this time, the control instruction for the power output change of the energy storage unit is: When the adjustable margin of other electrical equipment in the hydrometallurgical smelter is greater than the second preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a second priority strategy. The second priority corresponds to the priority supply of the generator, which belongs to the self-contained power generation system of the hydrometallurgical smelter. At this time, the generator power output change control instruction is: When the adjustable margin of other electrical equipment in the hydrometallurgical smelter is greater than the first preset threshold and less than the second preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a third priority strategy. The third priority corresponds to the same priority of energy storage supply and generator supply. At this time, the control instruction of the power output change of the energy storage unit and the generator is: P st-en +P di-ge +P re =P va-f-m ; Where ΔP st-en Indicates the power output change of the energy storage unit, ΔP di-ge Indicates the change in generator power output in kW, ΔP va-f-m Indicates the actual change in power of the variable frequency motor in kW, s represents the Laplace operator, T represents the time constant of the saturation filter, ΔP re It represents the power output change of the renewable energy power generation system, in kW, P st-en Indicates the actual power supply of the energy storage unit after calculation, in kW, P di-ge Indicates the actual power supply of the generator after calculation, in kW, P re It represents the actual power supply of the renewable energy power generation system, in kW.

2. The hydrometallurgical plant microgrid control method based on energy storage inverter according to claim 1 is characterized in that: The controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the detection result includes: When the detection result shows that the power of the energy storage unit meets the power demand of the variable frequency motor within a preset time, the first circuit breaker is controlled to remain on, the second circuit breaker is controlled to remain off, and the generator in the hydrometallurgical smelter microgrid is controlled to standby; When the detection result shows that the power of the energy storage unit does not meet the power demand of the variable frequency motor within the preset time period, the opening and closing of the first circuit breaker and the second circuit breaker are controlled based on the frequency margin of the generator in the hydrometallurgical plant microgrid.

3. The microgrid control method for a hydrometallurgical plant based on an energy storage inverter according to claim 2, characterized in that: The controlling the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency margin of the generator in the hydrometallurgical smelter microgrid includes: When the generator in the hydrometallurgical smelter microgrid has a frequency margin and the frequency margin meets the power requirement of the variable frequency motor, controlling the first circuit breaker to remain on and the second circuit breaker to remain off; When the generator in the hydrometallurgical smelter microgrid has a frequency margin but the frequency margin does not meet the power requirement of the variable frequency motor, and the energy storage unit has stored energy, the first circuit breaker and the second circuit breaker are controlled to remain on, so that the generator in the hydrometallurgical smelter microgrid and the energy storage inverter are cross-synchronized to supply power; When the generator in the hydrometallurgical smelter microgrid has no frequency margin and the output of the renewable energy meets the operating power requirement of the variable frequency motor in the current time period, the first circuit breaker is controlled to be disconnected and the second circuit breaker is controlled to be connected, so that the renewable energy supplies power to the variable frequency motor through the energy storage unit; When the generator in the hydrometallurgical plant microgrid has no frequency margin, the energy storage unit has no stored energy, and the output of the renewable energy does not meet the operating power requirement of the variable frequency motor in the current period, the load of other electrical equipment in the hydrometallurgical plant microgrid is controlled or the variable frequency motor is controlled to be shut down based on the feasibility of load reduction of other electrical equipment in the hydrometallurgical plant microgrid.

4. The microgrid control method for a hydrometallurgical plant based on an energy storage inverter according to claim 1, characterized in that: The method further comprises: Detecting control information of the variable frequency motor; When the control information of the variable frequency motor reflects that the control frequency of the variable frequency motor is greater than a frequency threshold, the first circuit breaker and the second circuit breaker are controlled to remain on.

5. A microgrid control device for a hydrometallurgical plant based on an energy storage inverter, characterized in that: The energy storage inverter includes an energy storage unit, a first AC-DC converter and an inverter. The input end of the AC-DC converter is connected to the external power grid through an AC bus, and a first circuit breaker is provided between the first AC-DC converter and the external power grid. The output end of the first AC-DC converter is connected to the input end of the inverter, and the output end of the inverter is connected to the variable frequency motor. The energy storage unit is connected between the output end of the AC-DC converter and the input end of the inverter through a branch. A second circuit breaker is provided on the branch. The energy storage unit and the renewable energy power generation system are both connected to the DC bus. The AC bus and the DC bus are connected through a second branch. A second AC-DC converter is provided on the second branch. The device comprises: a data acquisition module, configured to detect frequency changes of the AC bus in the hydrometallurgical smelter microgrid and obtain frequency change data; a control module, configured to control the opening and closing of the first circuit breaker and the second circuit breaker based on the frequency change data; When the adjustable margin of other user equipment in the hydrometallurgical smelter is less than a first preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a first priority strategy, where the first priority corresponds to priority energy storage supply. At this time, the control instruction for the power output change of the energy storage unit is: When the adjustable margin of other electrical equipment in the hydrometallurgical smelter is greater than the second preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a second priority strategy. The second priority corresponds to the priority supply of the generator, which belongs to the self-contained power generation system of the hydrometallurgical smelter. At this time, the generator power output change control instruction is: When the adjustable margin of other electrical equipment in the hydrometallurgical smelter is greater than the first preset threshold and less than the second preset threshold, the hydrometallurgical smelter microgrid is controlled to operate with a third priority strategy. The third priority corresponds to the same priority of energy storage supply and generator supply. At this time, the control instruction of the power output change of the energy storage unit and the generator is: P st-en +P di-ge +P re =P va-f-m ; Where ΔP st-en Indicates the power output change of the energy storage unit, ΔP di-ge Indicates the change in generator power output in kW, ΔP va-f-m Indicates the actual change in power of the variable frequency motor in kW, s represents the Laplace operator, T represents the time constant of the saturation filter, ΔP re It represents the power output change of the renewable energy power generation system, in kW, P st-en Indicates the actual power supply of the energy storage unit after calculation, in kW, P di-ge Indicates the actual power supply of the generator after calculation, in kW, P re It represents the actual power supply of the renewable energy power generation system, in kW.

6. 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 microgrid control method for a hydrometallurgical plant based on an energy storage inverter as described in any one of claims 1 to 4 is implemented.

7. 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 microgrid control method for a hydrometallurgical plant based on an energy storage inverter as described in any one of claims 1 to 4 is implemented.

8. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the microgrid control method for a hydrometallurgical plant based on an energy storage inverter as described in any one of claims 1 to 4 is implemented.

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