System and method for controlling energy storage prefabricated cabin of light-stored diesel micro-grid

Abstract

The invention provides a control system and method for an energy storage prefabricated cabin of a light-stored diesel micro-grid, and the system comprises an energy storage assembly which is used for storing electric energy; the photovoltaic access assembly is used for connecting a photovoltaic power generation system; the power generation assembly is used for generating power by using a generator; the power distribution metering assembly is used for performing power distribution on each load in the micro-grid system; and the protection control assembly is used for protecting and controlling the safety and stability of the micro-grid system. According to the technical scheme, efficient utilization of clean energy in a non-electricity area is achieved, balanced output of the battery system is guaranteed, and the service life of the battery system is prolonged.

Description

Background Art

[0002] Conventional energy storage prefabricated cabin systems use multiple energy storage battery clusters in parallel, and the output is connected to a centralized energy storage converter, which is then connected to the grid through an isolation transformer, using a peak-shaving and valley-filling operation mode. The main disadvantages of this system are reflected in the following aspects:

[0003] 1. Limitations of battery cluster parallel connection:

[0004] Since battery clusters are directly connected in parallel, the overall life of the system may be limited by the battery with the shortest life, which is the so-called "barrel effect". Circulation current may be generated between parallel battery clusters due to inconsistent discharge depth, which not only affects the charging and discharging efficiency of the system, but may also cause overcharging of the battery cells, increasing safety risks.

[0005] 2. Challenges of centralized energy storage converters:

[0006] Although the control logic of centralized energy storage systems is simple, once a failure occurs, on-site debugging is complex and time-consuming, and usually requires professional personnel from the manufacturer to be present for maintenance, resulting in long system downtime and high operation and maintenance costs.

[0007] 3. Difficulty in implementing the peak-shaving and valley-filling strategy:

[0008] The technology is difficult to implement. The peak-shaving and valley-filling strategy relies on advanced technical means, such as energy storage systems, smart meters, and remote monitoring. The research and development, deployment, and maintenance costs of these technologies are high. It is difficult to change user habits. The peak-shaving and valley-filling strategy requires users to change their traditional electricity habits, which may have a certain impact on their daily life and work, and requires users to have a high degree of cooperation and self-discipline. Grid security risks. The implementation of the peak-shaving and valley-filling strategy may have a certain impact on the safe operation of the grid, such as grid voltage fluctuations, harmonic pollution, and other problems. Summary of the invention

[0009] The present application provides a control system and method for a prefabricated cabin for energy storage in a photovoltaic-diesel microgrid, which is used to achieve efficient utilization of clean energy in areas without electricity, ensure balanced output of the battery system, increase the service life of the battery system, and obtain economically stable energy supply and application.

[0010] In the first aspect, a control system for a prefabricated cabin of a photovoltaic-diesel microgrid energy storage system is provided, comprising:

[0011] Energy storage components for storing electrical energy;

[0012] Photovoltaic access components, used to connect to photovoltaic power generation systems;

[0013] A power generation component, used for generating electricity using a generator;

[0014] The power distribution metering component is used to distribute power to each load in the microgrid system;

[0015] The protection and control component is used to protect and control the safety and stability of the microgrid system.

[0016] In the above technical scheme, energy storage components are provided to store electric energy; photovoltaic access components are provided to connect photovoltaic power generation systems; power generation components are provided to generate electricity using generators; power distribution metering components are provided to distribute power to various loads in the microgrid system; and protection and control components are provided to protect and control the safety and stability of the microgrid system. By adopting an optimized control and deployment strategy for photovoltaic, energy storage, diesel generation and loads, efficient utilization of clean energy in areas without electricity is achieved, balanced output of the battery system is ensured, the service life of the battery system is increased, and economical and stable energy supply and application are obtained.

[0017] In a specific embodiment, the energy storage assembly includes a plurality of battery packs, and the battery packs are used to store electrical energy.

[0018] In a specific implementation scheme, the photovoltaic access component includes a photovoltaic inverter, wherein:

[0019] The photovoltaic inverter is used to connect to a photovoltaic power generation system.

[0020] In a specific embodiment, the power generation component includes a diesel generator.

[0021] In a specific implementation scheme, the distribution metering component includes a photovoltaic, storage, and diesel-load distribution system.

[0022] In a specific implementation manner, the protection and control component includes a microgrid control and monitoring system.

[0023] In a second aspect, a control method for a prefabricated energy storage cabin of a photovoltaic-diesel microgrid is provided, comprising the following steps:

[0024] Storing electrical energy using energy storage components;

[0025] Use photovoltaic access components to connect photovoltaic power generation systems;

[0026] Using power generation components to generate electricity;

[0027] Use power distribution metering components to distribute power to each load in the microgrid system;

[0028] Protection and control components are used to protect and control the safety and stability of the microgrid system.

[0029] In the above technical scheme, energy storage components are provided to store electric energy; photovoltaic access components are provided to connect photovoltaic power generation systems; power generation components are provided to generate electricity using generators; power distribution metering components are provided to distribute power to various loads in the microgrid system; and protection and control components are provided to protect and control the safety and stability of the microgrid system. By adopting an optimized control and deployment strategy for photovoltaic, energy storage, diesel generation and loads, efficient utilization of clean energy in areas without electricity is achieved, balanced output of the battery system is ensured, the service life of the battery system is increased, and economical and stable energy supply and application are obtained.

[0030] In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0031] The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator does not start; when the photovoltaic power generation power is greater than the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power is less than the load power consumption, the energy storage BESS is discharged.

[0032] In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0033] The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator is connected to the grid for power generation; when the photovoltaic power generation power + the diesel generator power > the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power + the diesel generator power < the load power consumption, the energy storage BESS is discharged.

[0034] In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0035] The energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator does not start; the energy storage BESS discharges to supply power to the load;

[0036] When the energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator is connected to the grid to discharge; when the energy storage BESS is charged, the diesel generator not only supplies power to the load, but also charges the energy storage BESS simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of a prefabricated solar-diesel microgrid energy storage cabin control system provided in an embodiment of the present application;

[0038] Figure 2 A flowchart of a control method for a prefabricated solar-energy-storage-diesel microgrid energy storage cabin provided in an embodiment of the present application;

[0039] Figure 3A schematic diagram of the control mode of the photovoltaic-diesel energy storage microgrid energy storage prefabricated cabin control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0041] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0042] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] To facilitate understanding of the control system and method of the prefabricated cabin for energy storage of the photovoltaic-diesel microgrid provided in the embodiment of the present application, its application scenario is first explained. The control system and method of the prefabricated cabin for energy storage of the photovoltaic-diesel microgrid provided in the embodiment of the present application are used to realize the efficient utilization of clean energy in areas without electricity, ensure the balanced output of the battery system, improve the service life of the battery system, and obtain economical and stable energy supply and application. The conventional energy storage prefabricated cabin system uses multiple energy storage battery clusters in parallel, and the output is connected to the centralized energy storage inverter, and then connected to the power grid through an isolation transformer, adopting a peak-shaving and valley-filling operation mode. The main disadvantages of this system are reflected in the following aspects: 1. Limitations of battery clusters in parallel: Since the battery clusters are directly connected in parallel, the overall life of the system may be limited by the battery with the shortest life, which is the so-called "barrel effect". Circulation may be generated between parallel battery clusters due to inconsistent discharge depth, which not only affects the charging and discharging efficiency of the system, but also may cause overcharging of the battery cells, increasing safety risks. 2. Challenges of centralized energy storage converters: Although the control logic of centralized energy storage systems is simple, once a fault occurs, on-site debugging is complex and has a long cycle. It usually requires professional personnel from the manufacturer to be on site for maintenance, resulting in long system downtime and high operation and maintenance costs. 3. Difficulty in implementing the peak-shaving and valley-filling strategy: The technical implementation is difficult. The peak-shaving and valley-filling strategy relies on advanced technical means, such as energy storage systems, smart meters, remote monitoring, etc. The research and development, deployment and maintenance costs of these technologies are high. It is difficult to change user habits. The peak-shaving and valley-filling strategy requires users to change their traditional electricity habits, which may have a certain impact on their daily life and work, and requires users to have a high degree of cooperation and self-discipline. Grid security risks. The implementation of the peak-shaving and valley-filling strategy may have a certain impact on the safe operation of the grid, such as grid voltage fluctuations, harmonic pollution and other problems. For this reason, the embodiment of the present application provides a control system and method for a prefabricated cabin for energy storage of a photovoltaic storage diesel microgrid to achieve efficient utilization of clean energy in areas without electricity, ensure balanced output of the battery system, improve the service life of the battery system, and obtain economically stable energy supply and application. The following is a detailed description of the embodiment in conjunction with specific drawings.

[0044] refer to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of a prefabricated solar-diesel microgrid energy storage cabin control system provided in an embodiment of the present application; Figure 2 A flowchart of a control method for a prefabricated solar-energy-storage-diesel microgrid energy storage cabin provided in an embodiment of the present application; Figure 3 A schematic diagram of the control mode of the photovoltaic-diesel energy storage microgrid energy storage prefabricated cabin control method provided in an embodiment of the present application.

[0045] exist Figure 1 In the embodiment of the present application, a control system for a prefabricated energy storage cabin of a photovoltaic-diesel microgrid is provided, including:

[0046] Energy storage components for storing electrical energy;

[0047] Photovoltaic access components, used to connect to photovoltaic power generation systems;

[0048] A power generation component, used for generating electricity using a generator;

[0049] The power distribution metering component is used to distribute power to each load in the microgrid system;

[0050] The protection and control component is used to protect and control the safety and stability of the microgrid system.

[0051] In the above technical scheme, energy storage components are provided to store electric energy; photovoltaic access components are provided to connect photovoltaic power generation systems; power generation components are provided to generate electricity using generators; power distribution metering components are provided to distribute power to various loads in the microgrid system; and protection and control components are provided to protect and control the safety and stability of the microgrid system. By adopting an optimized control and deployment strategy for photovoltaic, energy storage, diesel generation and loads, efficient utilization of clean energy in areas without electricity is achieved, balanced output of the battery system is ensured, the service life of the battery system is increased, and economical and stable energy supply and application are obtained.

[0052] In a specific embodiment, the energy storage assembly includes a plurality of battery packs, and the battery packs are used to store electrical energy.

[0053] In a specific implementation scheme, the photovoltaic access component includes a photovoltaic inverter, wherein:

[0054] The photovoltaic inverter is used to connect to a photovoltaic power generation system.

[0055] In a specific embodiment, the power generation component includes a diesel generator.

[0056] In a specific implementation scheme, the distribution metering component includes a photovoltaic, storage, and diesel-load distribution system.

[0057] In a specific implementation manner, the protection and control component includes a microgrid control and monitoring system.

[0058] Specifically, refer to Figure 1 The battery prefabricated cabin is equipped with five clusters of lithium iron phosphate batteries and two energy storage inverters, of which three clusters of batteries are connected to the 1# energy storage inverter and the other two clusters of batteries are connected to the 2# energy storage inverter. The output power is collected and distributed through the energy management system EMS to ensure balanced output of the batteries.

[0059] Preferably, the energy storage battery prefabricated cabin system working mode is that the 1# energy storage inverter adopts VF mode for off-grid operation, establishes 380V bus voltage, the photovoltaic inverter is connected to the system in MPPT mode, the diesel generator set provides backup power supply, and the 2# energy storage inverter receives the EMS system power command and adopts the specified power to connect to the system.

[0060] Among them, the VF (Voltage and Frequency) mode means that the energy storage inverter maintains the output voltage and frequency unchanged, while the output active power and reactive power are determined by the load. Including: Voltage control: In VF mode, the energy storage inverter can ensure that the output voltage remains at a stable level, which is the basis for the stable operation of the power system; Frequency control: The energy storage inverter will also adjust the output frequency to meet the grid standards (such as 50Hz or 60Hz) to ensure that all connected loads can work normally.

[0061] Control strategy: The VF control strategy achieves precise control of the output voltage and frequency by adjusting the operating parameters of the energy storage converter, such as the set values ​​of the voltage outer loop and the current inner loop.

[0062] Response speed: When the load changes, the energy storage inverter in VF mode needs to respond quickly and adjust the output power in a short time to ensure the stable operation of the load, providing a strong guarantee for the stable operation of the power system.

[0063] Among them, the MPPT (Maximum Power Point Tracking) mode is an advanced control strategy that enables the photovoltaic inverter to adjust its operating point in real time to ensure that the photovoltaic module always operates near the maximum power point. Including:

[0064] Real-time monitoring: The inverter monitors the output voltage and current of the PV panels in real time to calculate the current output power.

[0065] Dynamic adjustment: Based on the real-time monitored data, the inverter will dynamically adjust its output voltage and current so that the photovoltaic modules always operate near the maximum power point. This adjustment is achieved by changing the circuit parameters inside the inverter, such as changing the duty cycle of the PWM (pulse width modulation) signal.

[0066] Maximum Power Point Tracking: As environmental factors such as light and temperature change, the maximum power point moves accordingly. The MPPT algorithm tracks this change in real time and adjusts the inverter's operating point accordingly to ensure maximum output power is always obtained.

[0067] The advantages of MPPT mode include:

[0068] Improve power generation efficiency: By real-time tracking of the maximum power point, the MPPT mode can significantly improve the power generation efficiency of the photovoltaic power generation system. Compared with traditional inverters, photovoltaic inverters using MPPT technology can increase power generation efficiency by 10% to 20%.

[0069] Enhanced system stability: When environmental factors such as light and temperature fluctuate greatly, the MPPT mode can keep the photovoltaic modules running stably near the maximum power point, thereby enhancing the stability of the entire photovoltaic power generation system.

[0070] Optimize energy utilization: The MPPT mode can make full use of solar energy resources, so that the photovoltaic system always maintains the best working state under different light intensity and temperature conditions, thereby optimizing energy utilization.

[0071] The implementation methods of MPPT mode include:

[0072] Constant voltage tracking method: This is a simple and commonly used MPPT method. It assumes that under a certain light intensity, the voltage corresponding to the maximum power point of the photovoltaic module is constant. Therefore, the inverter only needs to keep the output voltage near this constant value. However, this method is less effective when the light intensity varies greatly.

[0073] Perturbation and observation method: This method periodically perturbs the output voltage or current of the inverter and observes the change in output power to determine whether it is close to the maximum power point. If the output power increases, continue to perturb in the same direction; if the output power decreases, perturb in the opposite direction. This method is simple to implement and has a fast response speed, but it may cause misjudgment when the light intensity changes sharply.

[0074] Incremental conductance method: This method determines whether the maximum power point is close to the slope of the PV characteristic curve of the photovoltaic module. It determines the position of the operating point by observing the derivative of the output power to the voltage (i.e., incremental conductance) and adjusts the inverter's operating point accordingly. This method can maintain good tracking results even when the light intensity changes greatly.

[0075] In this embodiment, the MPPT mode adopts the perturbation and observation method.

[0076] In this embodiment, the technical problems to be solved include:

[0077] 1. Solve the parallel operation control of multiple energy storage inverters of the same model equipped with lithium iron phosphate batteries of different capacities to ensure the consistency of various performance parameters such as SOC (State of Charge) and SOE (State of Energy) of the corresponding batteries.

[0078] 2. Solve the coordinated control of photovoltaic systems, energy storage systems, and diesel generation systems to ensure stable power supply to the system.

[0079] In order to solve the above technical problems, the technical solutions adopted in this application include: when multiple energy storage inverters are in operation, the real-time power of the load, photovoltaic inverter, and diesel generator is collected through the EMS system, the total power of the energy storage system is calculated, and then the power is distributed according to the number of battery clusters connected to each energy storage inverter, where the grid-connected PCS is controlled by the EMS system for power setting, and the off-grid PCS is dynamically adjusted by the system power demand, so as to achieve the balance of the charge and discharge current of each battery cluster and the stability of SOC, and indirectly realize the SOE control of the battery. And the photovoltaic storage diesel microgrid control system adopts four control modes to stabilize the system power supply. Including:

[0080] Mode 1: The energy storage BESS (Battery Energy Storage Systems) works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator does not start. When the photovoltaic power generation power is greater than the load power consumption, the energy storage BESS charges; when the photovoltaic power generation power is less than the load power consumption, the energy storage BESS discharges.

[0081] Mode 2: The energy storage BESS works in off-grid mode, the PV inverter works in grid-connected MPPT mode, and the diesel generator is connected to the grid for power generation. When the PV power generation + diesel power generation > load power consumption, the energy storage BESS charges; when the PV power generation + diesel power generation < load power consumption, the energy storage BESS discharges.

[0082] Mode 3: The energy storage BESS works in off-grid mode, the PV inverter does not generate electricity, and the diesel generator does not start. The energy storage BESS discharges to supply power to the load.

[0083] Mode 4: The energy storage BESS works in off-grid mode, the PV inverter does not generate electricity, and the diesel generator is connected to the grid to discharge. The energy storage BESS is charged, and the diesel generator not only supplies power to the load, but also charges the battery simultaneously.

[0084] In the above technical scheme, energy storage components are provided to store electric energy; photovoltaic access components are provided to connect photovoltaic power generation systems; power generation components are provided to generate electricity using generators; power distribution metering components are provided to distribute power to various loads in the microgrid system; and protection and control components are provided to protect and control the safety and stability of the microgrid system. By adopting an optimized control and deployment strategy for photovoltaic, energy storage, diesel generation and loads, efficient utilization of clean energy in areas without electricity is achieved, balanced output of the battery system is ensured, the service life of the battery system is increased, and economical and stable energy supply and application are obtained.

[0085] exist Figure 2 In the embodiment of the present application, a control method for a prefabricated energy storage cabin of a photovoltaic-diesel microgrid is provided, comprising the following steps:

[0086] Storing electrical energy using energy storage components;

[0087] Use photovoltaic access components to connect photovoltaic power generation systems;

[0088] Using power generation components to generate electricity;

[0089] Use power distribution metering components to distribute power to each load in the microgrid system;

[0090] Protection and control components are used to protect and control the safety and stability of the microgrid system.

[0091] In the above technical scheme, energy storage components are provided to store electric energy; photovoltaic access components are provided to connect photovoltaic power generation systems; power generation components are provided to generate electricity using generators; power distribution metering components are provided to distribute power to various loads in the microgrid system; and protection and control components are provided to protect and control the safety and stability of the microgrid system. By adopting an optimized control and deployment strategy for photovoltaic, energy storage, diesel generation and loads, efficient utilization of clean energy in areas without electricity is achieved, balanced output of the battery system is ensured, the service life of the battery system is increased, and economical and stable energy supply and application are obtained.

[0092] refer to Figure 3 In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0093] The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator does not start; when the photovoltaic power generation power is greater than the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power is less than the load power consumption, the energy storage BESS is discharged.

[0094] In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0095] The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator is connected to the grid for power generation; when the photovoltaic power generation power + the diesel generator power > the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power + the diesel generator power < the load power consumption, the energy storage BESS is discharged.

[0096] In a specific implementation scheme, the step of using the power distribution metering component to distribute power to each load in the microgrid system includes:

[0097] The energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator does not start; the energy storage BESS discharges to supply power to the load;

[0098] The energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator is connected to the grid to discharge. When the energy storage BESS is charged, the diesel generator not only supplies power to the load, but also charges the energy storage BESS simultaneously.

[0099] Those skilled in the art will appreciate that the present application may be implemented as a system, method or computer program product.

[0100] Therefore, the present disclosure may be specifically implemented in the following forms, namely: it may be completely hardware, it may be completely software (including firmware, resident software, microcode, etc.), or it may be a combination of hardware and software, generally referred to herein as a "circuit", "module" or "system". In addition, in some embodiments, the present application may also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium may contain computer-readable program code.

[0101] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0102] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A control system for a prefabricated cabin for energy storage of a photovoltaic and diesel microgrid, characterized in that: include: Energy storage components for storing electrical energy; Photovoltaic access components, used to connect to photovoltaic power generation systems; A power generation component, used for generating electricity using a generator; The power distribution metering component is used to distribute power to each load in the microgrid system; The protection and control component is used to protect and control the safety and stability of the microgrid system.

2. The control system of the prefabricated cabin for solar-energy-storage-diesel microgrid energy storage according to claim 1 is characterized in that: The energy storage component includes a plurality of battery packs, and the battery packs are used to store electrical energy.

3. The control system of the prefabricated cabin for solar-energy-storage-diesel microgrid energy storage according to claim 2 is characterized in that: The photovoltaic access component includes a photovoltaic inverter, wherein: The photovoltaic inverter is used to connect to a photovoltaic power generation system.

4. The control system of the prefabricated cabin for solar-energy-storage-diesel microgrid energy storage according to claim 3 is characterized in that: The power generation assembly includes a diesel generator.

5. The control system of the prefabricated cabin for solar-energy-storage-diesel microgrid energy storage according to claim 4 is characterized in that: The power distribution metering component includes a photovoltaic, storage, diesel and load distribution system.

6. The control system of the prefabricated cabin for solar-energy-storage-diesel microgrid energy storage according to claim 5 is characterized in that: The protection and control component includes a microgrid control and monitoring system.

7. A control method for a prefabricated energy storage cabin of a photovoltaic-diesel microgrid, characterized in that: The following steps are involved: Storing electrical energy using energy storage components; Use photovoltaic access components to connect photovoltaic power generation systems; Using power generation components to generate electricity; Use power distribution metering components to distribute power to each load in the microgrid system; Protection and control components are used to protect and control the safety and stability of the microgrid system.

8. The control method of the prefabricated energy storage cabin of the photovoltaic-diesel microgrid according to claim 7 is characterized in that: The steps of using the power distribution metering component to distribute power to each load in the microgrid system include: The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator does not start; when the photovoltaic power generation power is greater than the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power is less than the load power consumption, the energy storage BESS is discharged.

9. The control method of the prefabricated energy storage cabin of the photovoltaic-diesel microgrid according to claim 8 is characterized in that: The steps of using the power distribution metering component to distribute power to each load in the microgrid system include: The energy storage BESS works in off-grid mode, the photovoltaic inverter works in grid-connected MPPT mode, and the diesel generator is connected to the grid for power generation; when the photovoltaic power generation power + the diesel generator power > the load power consumption, the energy storage BESS is charged; when the photovoltaic power generation power + the diesel generator power < the load power consumption, the energy storage BESS is discharged.

10. The control method of the prefabricated energy storage cabin of the photovoltaic-diesel microgrid according to claim 9 is characterized in that: The steps of using the power distribution metering component to distribute power to each load in the microgrid system include: The energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator does not start; the energy storage BESS discharges to supply power to the load; When the energy storage BESS works in off-grid mode, the photovoltaic inverter does not generate electricity, and the diesel generator is connected to the grid to discharge; when the energy storage BESS is charged, the diesel generator not only supplies power to the load, but also charges the energy storage BESS simultaneously.

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