Intelligent control method and system for optical-stored diesel micro-grid, and storage medium

Abstract

The invention provides an intelligent control method and system for an optical-stored-diesel micro-grid and a storage medium, and the method comprises the steps: firstly, judging whether a power supply demand of a load is met or not according to first power information and second power information; if yes, entering a photovoltaic power supply mode; if not, judging whether the first power grid state information is in a power supply state or not; if yes, entering a power grid power supply mode; if not, whether the power supply requirement of the load is met or not is judged according to the first electric quantity information and the first power information; if yes, entering an energy storage power supply mode; if not, entering a diesel power supply mode; according to the power grid state and the photovoltaic power generation state, the power supply of the load is automatically switched so as to ensure the stability of electric energy supply; and by intelligently adjusting the diesel power generation power and the charging and discharging conditions of the energy storage battery, the power utilization cost is reduced, and the cost performance of electric energy supply is improved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and more specifically, to an intelligent control method, system and storage medium for a photovoltaic-storage-diesel microgrid. Background Art

[0002] The photovoltaic-diesel-storage microgrid system is a distributed energy supply system that combines multiple energy sources such as solar photovoltaic panels, diesel generators and energy storage batteries to form an independent power network. The system is designed to provide a stable and sustainable power supply, especially in remote areas or places where traditional power grids are insufficient, to meet the power needs of users.

[0003] Since diesel generators are used to supplement electricity, there are problems such as large diesel consumption, high cost, and high carbon emissions. With the development of photovoltaic power generation technology and energy storage technology, when applied to areas with good lighting conditions, it can effectively reduce the dependence on diesel power generation. By incorporating a photovoltaic energy storage system into a diesel power generation system, it has the advantages of reducing fuel consumption, reducing power generation costs, and reducing pollution.

[0004] However, photovoltaic power generation is unstable but cost-effective because it depends on light conditions, while diesel generators have stable power supply but low cost-effectiveness. Therefore, there is an urgent need for an intelligent control technology for photovoltaic-storage-diesel microgrid that can ensure stable power supply and take into account the cost-effectiveness of power supply. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide an intelligent control method, system and storage medium for a photovoltaic-diesel microgrid, which automatically switches the power supply of the load according to the power grid status and the photovoltaic power generation status to ensure the stability of the power supply; and also reduces the electricity cost and improves the cost-effectiveness of the power supply by intelligently adjusting the diesel power generation power and the charging and discharging of the energy storage battery.

[0006] A first aspect of the present invention provides an intelligent control method for a photovoltaic-storage-diesel microgrid, the method comprising: Acquire first power information and second power information; Determining whether the power supply demand of the load is met according to the first power information and the second power information; If yes, it enters photovoltaic power supply mode; If not, obtaining first power grid state information to determine whether the first power grid state information is a power supply state; If yes, it enters the grid power supply mode; If not, obtaining first power information; Determining whether the power supply demand of the load is met according to the first power information and the first power information; If yes, it enters the energy storage power supply mode; If not, it enters diesel power supply mode.

[0007] In this solution, judging whether the power supply demand of the load is met according to the first power information and the second power information is specifically: According to a preset time period, sequentially collecting and recording the second power information; Obtaining a first power sequence according to the recorded second power information in accordance with a preset sorting rule; According to the quantity of the second power information in the first power sequence, obtaining third power information from the first power sequence according to a preset extraction rule; Obtaining first power difference information according to a difference between the third power information and the first power information; Determining a first power difference threshold according to the first power information; Determining whether the first power difference information is the first power difference threshold; If yes, it means the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0008] In this solution, judging whether the power supply demand of the load is met according to the first power information and the first power information is specifically: Determining whether the first power information exceeds a preset first power threshold; If yes, obtaining first duration information according to the first power information and the first power information; Determining whether the first duration information exceeds a preset first duration threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0009] This plan also includes: Get power supply mode information; When it is determined that the power supply mode information is the photovoltaic power supply mode or the energy storage power supply mode, the static transfer switch is driven to switch to an off state according to a preset first switch control instruction; When it is determined that the power supply mode information is the power grid power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the power grid access state according to the preset second switch control instruction; When it is determined that the power supply mode information is the diesel power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the diesel passage state according to the preset second switch control instruction.

[0010] This plan also includes: Get power supply mode information; Determine whether the power supply mode information is an energy storage power supply mode; If yes, the energy storage converter is driven to control the energy storage device to discharge according to the preset first discharge control instruction; If not, the energy storage converter is driven to supplement electric energy to the energy storage device according to the preset first charging control instruction.

[0011] This plan also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; acquiring fourth power information; Obtaining second power difference information according to a difference between the fourth power information and the first power information; Determining first power generation deviation value information according to the second power difference value information; According to the first power generation deviation value information, the power generation control amount information is obtained according to a preset feedback control strategy; The power generation power of the diesel generator is adjusted according to the power generation control amount information.

[0012] A second aspect of the present invention provides an intelligent control system for a photovoltaic-storage-diesel microgrid, including an intelligent control method program for a photovoltaic-storage-diesel microgrid. When the intelligent control method program for a photovoltaic-storage-diesel microgrid is executed by the processor, the following steps are implemented: Acquire first power information and second power information; Determining whether the power supply demand of the load is met according to the first power information and the second power information; If yes, it enters photovoltaic power supply mode; If not, obtaining first power grid state information to determine whether the first power grid state information is a power supply state; If yes, it enters the grid power supply mode; If not, obtaining first power information; Determining whether the power supply demand of the load is met according to the first power information and the first power information; If yes, it enters the energy storage power supply mode; If not, it enters diesel power supply mode.

[0013] In this solution, judging whether the power supply demand of the load is met according to the first power information and the second power information is specifically: According to a preset time period, sequentially collecting and recording the second power information; Obtaining a first power sequence according to the recorded second power information in accordance with a preset sorting rule; According to the quantity of the second power information in the first power sequence, obtaining third power information from the first power sequence according to a preset extraction rule; Obtaining first power difference information according to a difference between the third power information and the first power information; Determining a first power difference threshold according to the first power information; Determining whether the first power difference information is the first power difference threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0014] In this solution, judging whether the power supply demand of the load is met according to the first power information and the first power information is specifically: Determining whether the first power information exceeds a preset first power threshold; If yes, obtaining first duration information according to the first power information and the first power information; Determining whether the first duration information exceeds a preset first duration threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0015] The third aspect of the present invention provides a computer-readable storage medium, which includes a smart control method program for a photovoltaic-energy-storage-diesel microgrid. When the smart control method program for a photovoltaic-energy-storage-diesel microgrid is executed by a processor, the steps of the smart control method for a photovoltaic-energy-storage-diesel microgrid as described in any one of the above items are implemented.

[0016] The present invention provides an intelligent control method, system and storage medium for a photovoltaic-storage-diesel microgrid. First, according to first power information and second power information, it is judged whether the power supply demand of the load is met; if so, the photovoltaic power supply mode is entered; if not, it is judged whether the first power grid state information is a power supply state; if so, the power grid power supply mode is entered; if not, according to first electric quantity information and the first power information, it is judged whether the power supply demand of the load is met; if so, the energy storage power supply mode is entered; if not, the diesel power supply mode is entered; the present invention automatically switches the power supply of the load according to the power grid state and the photovoltaic power generation state to ensure the stability of the power supply; and also reduces the electricity cost and improves the cost performance of the power supply by intelligently adjusting the diesel power generation power and the charging and discharging of the energy storage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0018] Figure 1 A schematic diagram of an intelligent control device for a photovoltaic, energy-storage and diesel microgrid is shown; Figure 2 A flow chart of an intelligent control method of a photovoltaic-storage-diesel microgrid according to the present invention is shown; Figure 3 A flowchart of determining whether photovoltaic power generation meets load demand provided by an embodiment of the present invention is shown; Figure 4 A flow chart showing whether the power supply of the energy storage device provided by the embodiment of the present invention meets the load demand is shown; Figure 5 A block diagram of an intelligent control system for a photovoltaic-storage-diesel microgrid according to the present invention is shown. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0021] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0022] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0023] Figure 1 A schematic diagram of an intelligent control device for a photovoltaic-storage-diesel microgrid is shown.

[0024] like Figure 1 As shown, an intelligent control device for a photovoltaic, energy-storage and diesel microgrid, the device comprising: Automatic transfer switch ATS, static transfer switch STS and energy storage converter PCS; The automatic transfer switch ATS is a switch for automatically switching power supply, which is used to switch the external power supply to the power grid or the diesel generator; The static transfer switch STS is a power switch for switching the external power supply to an on or off state; The energy storage converter PCS is a device that changes the form of electrical energy and is used to control the charging and discharging state of the energy storage device.

[0025] It should be noted that the maximum power point tracking MPPT technology is to adjust the output voltage and current of the photovoltaic inverter in the photovoltaic power generation system so that the photovoltaic components always work at the maximum power point, thereby achieving the maximum power output of the photovoltaic power generation system. The external power supply source of the load is switched through the automatic transfer switch, and the external power supply is switched to the power grid or diesel generator. The connection state of the external power supply is switched through the static transfer switch, that is, the static transfer switch determines whether the load is connected to the external power. The main function of the energy storage inverter is to convert electrical energy from DC to AC or from AC to DC to control the charging and discharging of the energy storage device. After absorbing solar energy, the photovoltaic array converts solar energy into electrical energy through PCB and MPPT to provide electrical energy to the load or charge the energy storage battery.

[0026] Figure 2 A flow chart of an intelligent control method for a photovoltaic-storage-diesel microgrid of the present invention is shown.

[0027] like Figure 2 As shown, the present invention discloses an intelligent control method for a photovoltaic-storage-diesel microgrid, the method comprising: S202, obtaining first power information and second power information; S204: determining whether a power supply demand of a load is met according to the first power information and the second power information; S206, if yes, enter photovoltaic power supply mode; S208, if not, obtaining first power grid state information, and determining whether the first power grid state information is a power supply state; S210, if yes, enter the grid power supply mode; S212, if not, obtaining first power information; S214: determining whether a power supply demand of a load is met according to the first power information and the first power information; S216, if yes, enter energy storage power supply mode; S218, if not, enter the diesel power supply mode.

[0028] It should be noted that the first power information is the power required for the load to work, hereinafter referred to as the load power; the second power information is the power obtained by the photovoltaic power generation system, which can be used for power supply or storage after conversion, and then becomes the photovoltaic power generation power; the first grid state information is the supply status of the mains power grid, including the power supply status and the power failure status; the first power information is the power storage status of the energy storage device. In this embodiment, first, according to the photovoltaic power generation power obtained by the photovoltaic system, it is judged whether the power supply provided by the current photovoltaic system can meet the needs of the load work; if so, the photovoltaic power supply mode is entered, that is, the load working power demand is provided by the photovoltaic system, and the external power supply is cut off to improve the cost performance of the load power consumption. Then, if the photovoltaic power generation cannot meet the load power demand, the power of the photovoltaic power generation is used to charge the energy storage device, and the power required for the load work is provided by the external power supply, wherein, in the selection of the external power supply, the mains power grid is given priority as a rule to reduce the cost of electricity; when judging whether the mains power grid is in the power supply state, if so, the power grid power supply mode is entered. Finally, if the mains power grid is in a power failure state, then the energy storage device or the diesel generator is selected for power supply according to the power reserve of the energy storage device; that is, according to the power storage of the energy storage device and the power supply demand of the load, it is judged whether the energy storage device meets the working requirements of the load; if so, the energy storage power supply mode is entered to provide power to the load through the energy storage device; if not, the diesel power supply mode is entered to provide power to the load through the diesel generator. The present invention automatically switches the power supply of the load according to the power grid status and the photovoltaic power generation status to ensure the stability of the power supply.

[0029] Figure 3 A flow chart showing a mode for obtaining positioning information when the battery is sufficient is shown.

[0030] According to an embodiment of the present invention, Figure 3 As shown, judging whether the power supply demand of the load is met according to the first power information and the second power information is specifically: S302, sequentially collecting and recording the second power information according to a preset time period; S304, obtaining a first power sequence according to the recorded second power information and a preset sorting rule; S306: According to the quantity of the second power information in the first power sequence, obtain third power information from the first power sequence according to a preset extraction rule; S308, obtaining first power difference information according to a difference between the third power information and the first power information; S310, determining a first power difference threshold according to the first power information; S312, determining whether the first power difference information is the first power difference threshold; S314, if yes, it means that the power supply demand of the load is met; S316: If not, it means that the power supply demand of the load is not met.

[0031] It should be noted that the third power information is the stable power of photovoltaic power generation that can be provided by the photovoltaic power generation system in the photovoltaic power generation power strategy of this scheme. When judging whether the photovoltaic power meets the load working requirements, first, according to the preset photovoltaic power calculation strategy, the stable power that can be provided by photovoltaic power generation is obtained; the real-time photovoltaic power generation power of the photovoltaic power generation system is continuously measured and recorded according to the preset time period, and the recorded photovoltaic power generation power values ​​are obtained in ascending or descending order to obtain the first power sequence; then according to the number of photovoltaic power generation powers in the sequence, the position of the photovoltaic power generation power in the first power sequence is obtained to obtain the third power information; for example, the first power sequence composed of 100 second power information is extracted according to the 20% position from small to large, that is, in the ascending sequence, the 20th second power information in the sequence is extracted as the third power information, and in the descending sequence, the 80th second power information in the sequence is extracted as the third power information. By extracting a smaller value, it is ensured that the photovoltaic power generation power can be kept above the third power information; and then by intercepting, the influence of the measurement error on the extraction result of the third power information is reduced. Then, according to the load power and its preset fault tolerance value, the first power difference threshold is obtained; wherein, in order to cope with the increase in power demand caused by temporary emergencies during the operation of the load, the present invention sets the demand threshold by setting the fault tolerance value according to a certain ratio. For example, when the load power is 1000W, when the ratio of the fault tolerance value is set to 20%, the fault tolerance value is 200W at this time, that is, the power provided must reach at least 1200W to be considered as meeting the load demand. Finally, it is determined whether the difference between the third power information and the load power exceeds the fault tolerance value, that is, the first power difference threshold. If so, it means that the power generation of the photovoltaic power generation system meets the power supply demand of the load; if not, it means that the power generation of the photovoltaic power generation system does not meet the power supply demand of the load.

[0032] Figure 4 A flow chart of determining a mode for acquiring positioning information when the battery is low is shown.

[0033] According to an embodiment of the present invention, Figure 4 As shown, whether the power supply demand of the load is met according to the first power information and the first power information is specifically: S402, determining whether the first power information exceeds a preset first power threshold; S404: If yes, obtaining first duration information according to the first power information and the first power information; S406, determining whether the first duration information exceeds a preset first duration threshold; S408, if yes, it means that the power supply demand of the load is met; S410, if not, it indicates that the power supply demand of the load is not met.

[0034] It should be noted that the first duration information is the sustainable duration for the energy storage device to provide electrical energy to the load. When judging whether the energy storage device meets the load working requirements, first, judge whether the load power exceeds the preset first power threshold; wherein, the first power threshold represents the upper limit of the power that the energy storage device can provide, which is used to improve the safety of the use of the energy storage device. When the power provided by the energy storage device exceeds the upper limit of the power, it is determined that there is a risk of heating and burning. When it is judged that the load power is within the power supply range that the energy storage device can provide, the sustainable duration for the energy storage device to provide electrical energy to the load is calculated based on the first power information of the energy storage device and the load power information, which is recorded as the first duration information. When the first duration information exceeds the preset first duration threshold, it means that the energy storage device can meet the power supply requirements of the load as a power supply. If the first duration information does not exceed the preset first duration threshold, it indicates that the power of the energy storage device is at a low level, and it is necessary to prohibit the energy storage device from providing electrical energy to the load to avoid the situation where the service life is reduced due to excessive discharge of the energy storage device.

[0035] According to an embodiment of the present invention, it also includes: Get power supply mode information; When it is determined that the power supply mode information is the photovoltaic power supply mode or the energy storage power supply mode, the static transfer switch is driven to switch to an off state according to a preset first switch control instruction; When it is determined that the power supply mode information is the power grid power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the power grid access state according to the preset second switch control instruction; When it is determined that the power supply mode information is the diesel power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the diesel passage state according to the preset second switch control instruction.

[0036] It should be noted that the power supply mode information is the power supply mode of the system.

[0037] In this embodiment, when the power supply mode information is judged to be the photovoltaic power supply mode or the energy storage power supply mode, it means that the power supply of the external power supply needs to be cut off. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the disconnected state according to the operation status code in the instruction, so as to achieve the effect of disconnecting the external power supply from the load.

[0038] In another embodiment, when the power supply mode information is judged to be the grid power supply mode, it means that it is necessary to connect the grid in the external power supply to power the load. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the connection state according to the operation status code in the instruction, and by setting a preset second switch control instruction, the automatic transfer switch is driven to switch to the grid access state according to the operation status code in the instruction, so that the load can be circuit-connected with the grid in the external power supply, thereby realizing the grid powering the load.

[0039] In another embodiment, when the power supply mode information is judged to be the diesel power supply mode, it means that it is necessary to connect the diesel generator in the external power supply to power the load. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the connection state according to the operation status code in the instruction, and by setting a preset second switch control instruction, the automatic transfer switch is driven to switch to the diesel generator path state according to the operation status code in the instruction, so that the load can be circuit-connected with the diesel generator in the external power supply, thereby realizing diesel power generation to power the load.

[0040] According to an embodiment of the present invention, it also includes: Get power supply mode information; Determine whether the power supply mode information is an energy storage power supply mode; If yes, the energy storage converter is driven to control the energy storage device to discharge according to the preset first discharge control instruction; If not, the energy storage converter is driven to supplement electric energy to the energy storage device according to the preset first charging control instruction.

[0041] It should be noted that, in this embodiment, it is determined whether the power supply mode information is the energy storage power supply mode; if so, it means that the energy storage device discharges to provide electrical energy for the load, so the preset first discharge control instruction is used to drive the energy storage inverter according to the discharge power in the instruction, so that the energy storage device supplies electrical energy to the load; if not, it means that the energy storage device can perform an energy replenishment operation, so the preset first charging instruction is used to drive the energy storage inverter to charge the energy storage device according to the real-time available charging power.

[0042] According to an embodiment of the present invention, it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; acquiring fourth power information; Obtaining second power difference information according to a difference between the fourth power information and the first power information; Determining first power generation deviation value information according to the second power difference value information; According to the first power generation deviation value information, the power generation control amount information is obtained according to a preset feedback control strategy; The power generation power of the diesel generator is adjusted according to the power generation control amount information.

[0043] It should be noted that the fourth power information is the electric power provided by the diesel generator through power generation. In order to avoid the problem that excessive diesel combustion leads to an increase in diesel costs, and insufficient diesel combustion leads to insufficient power generation to support load operation, the present invention is provided with a feedback control strategy to adjust the diesel supply of the diesel generator in real time according to the power generation, so as to achieve adaptive adjustment of the diesel combustion amount. First, the difference between the fourth power information and the first power information is calculated to obtain the second power difference information; in order to cope with the temporary sudden change of load power, the first power generation deviation value information is determined after the preset power fault tolerance value is superimposed on the second power difference information to indicate the difference between the current power generation power of the diesel generator and the target power. Then, according to the first power generation deviation value information, the power generation control amount information is obtained according to the preset feedback control strategy. As an implementation method, the feedback control strategy is PID control. According to the first power generation deviation value information and the proportional coefficient, integral coefficient, and differential coefficient in the PID control, the proportional control amount, integral control amount, and differential control amount are obtained respectively to obtain the power generation control amount information. Finally, according to the power generation control quantity information, the diesel supply of the diesel generator is adjusted. At the same time, the corresponding air injection amount is adjusted according to the diesel supply, so as to realize adaptive adjustment of the power generation power of the diesel generator, thereby ensuring that the power generation power meets the load working requirements while reducing the diesel consumption, thereby reducing the cost of diesel power generation.

[0044] It is worth mentioning that it also includes: Acquire the first power sequence; Obtaining first power average information according to a preset average algorithm according to the amount of the second power information in the first power sequence; Obtaining a first power deviation value according to the first power sequence and the first power mean information; Determining a power deviation threshold according to the first power mean information; Determining whether the first power deviation value is lower than a power deviation threshold; If so, it means that the second power information is in a stable state and can be used as a power supply.

[0045] It should be noted that in the present embodiment, the stability of the second power information is detected to determine whether photovoltaic power generation can be used as a power supply for the load. According to the number of the second power information in the first power sequence, the interception length of the first power sequence is set, and then the first power mean information is calculated according to the intercepted first power sequence to represent the average value of the second power information. Then, according to the second power information in the intercepted first power sequence, the deviation value of the first power mean information is sequentially compared with the deviation value of the first power mean information, and then the mean of the sum of the squares of the deviation values ​​is calculated to obtain the first power deviation value. When the first power deviation value is lower than the preset power deviation threshold, it means that the second power information has a small fluctuation, that is, the stability meets the preset requirements, and can be determined to be in a stable state.

[0046] It is worth mentioning that it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the power grid power supply mode; Acquire the first power information; Determining whether the first power information is lower than a preset first power threshold; If so, the energy storage converter is driven to supply electric energy to the energy storage device according to the preset charging power information.

[0047] It should be noted that, in this embodiment, when the power supply mode information is judged to be the power grid power supply mode, in order to avoid the energy storage device being in a low power state for a long time and affecting the service life of the energy storage device, it is determined whether emergency energy replenishment is required based on the power information of the energy storage device. When the first power information is lower than the preset first power threshold, it means that the power of the energy storage device is in a too low state. At this time, the power grid is set to charge the energy storage device through the energy storage converter according to the preset charging power.

[0048] It is worth mentioning that it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; Acquire the first power information; Determining whether the first power information is lower than a preset first power threshold; If yes, obtaining fourth power information; According to the fourth power information, the energy storage converter is driven to supplement electric energy to the energy storage device.

[0049] It should be noted that in this embodiment, when the power supply mode information is judged to be the diesel power supply mode, in order to avoid the energy storage device being in a low power state for a long time and affecting the service life of the energy storage device, it is determined whether emergency energy replenishment is required based on the power information of the energy storage device. When the first power information is lower than the preset first power threshold, it means that the power of the energy storage device is too low. At this time, the power generation power of the diesel generator is obtained, and the part of the power generation power that exceeds the load power is set as the charging power of the energy storage inverter, so that the diesel generator can charge the energy storage device through the energy storage inverter.

[0050] Figure 5 A block diagram of an intelligent control system for a photovoltaic-storage-diesel microgrid according to the present invention is shown.

[0051] like Figure 5 As shown, the present invention discloses an intelligent control system 5 of a photovoltaic-storage-diesel microgrid, comprising a memory 51 and a processor 52, wherein the memory comprises an intelligent control method program of the photovoltaic-storage-diesel microgrid, and when the intelligent control method program of the photovoltaic-storage-diesel microgrid is executed by the processor, the following steps are implemented: Acquire first power information and second power information; Determining whether the power supply demand of the load is met according to the first power information and the second power information; If yes, it enters photovoltaic power supply mode; If not, obtaining first power grid state information to determine whether the first power grid state information is a power supply state; If yes, it enters the grid power supply mode; If not, obtaining first power information; Determining whether the power supply demand of the load is met according to the first power information and the first power information; If yes, it enters the energy storage power supply mode; If not, it enters diesel power supply mode.

[0052] It should be noted that the first power information is the power required for the load to work, hereinafter referred to as the load power; the second power information is the power obtained by the photovoltaic power generation system, which can be used for power supply or storage after conversion, and then becomes the photovoltaic power generation power; the first grid state information is the supply status of the mains power grid, including the power supply status and the power failure status; the first power information is the power storage status of the energy storage device. In this embodiment, first, according to the photovoltaic power generation power obtained by the photovoltaic system, it is judged whether the power supply provided by the current photovoltaic system can meet the needs of the load work; if so, the photovoltaic power supply mode is entered, that is, the load working power demand is provided by the photovoltaic system, and the external power supply is cut off to improve the cost performance of the load power consumption. Then, if the photovoltaic power generation cannot meet the load power demand, the power of the photovoltaic power generation is used to charge the energy storage device, and the power required for the load work is provided by the external power supply, wherein, in the selection of the external power supply, the mains power grid is given priority as a rule to reduce the cost of electricity; when judging whether the mains power grid is in the power supply state, if so, the power grid power supply mode is entered. Finally, if the mains power grid is in a power failure state, then the energy storage device or the diesel generator is selected for power supply according to the power reserve of the energy storage device; that is, according to the power storage of the energy storage device and the power supply demand of the load, it is judged whether the energy storage device meets the working requirements of the load; if so, the energy storage power supply mode is entered to provide power to the load through the energy storage device; if not, the diesel power supply mode is entered to provide power to the load through the diesel generator. The present invention automatically switches the power supply of the load according to the power grid status and the photovoltaic power generation status to ensure the stability of the power supply.

[0053] According to an embodiment of the present invention, judging whether the power supply demand of the load is met according to the first power information and the second power information is specifically: According to a preset time period, sequentially collecting and recording the second power information; Obtaining a first power sequence according to the recorded second power information in accordance with a preset sorting rule; According to the quantity of the second power information in the first power sequence, obtaining third power information from the first power sequence according to a preset extraction rule; Obtaining first power difference information according to a difference between the third power information and the first power information; Determining a first power difference threshold according to the first power information; Determining whether the first power difference information is the first power difference threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0054] It should be noted that the third power information is the stable power of photovoltaic power generation that can be provided by the photovoltaic power generation system in the photovoltaic power generation power strategy of this scheme. When judging whether the photovoltaic power meets the load working requirements, first, according to the preset photovoltaic power calculation strategy, the stable power that can be provided by photovoltaic power generation is obtained; the real-time photovoltaic power generation power of the photovoltaic power generation system is continuously measured and recorded according to the preset time period, and the recorded photovoltaic power generation power values ​​are obtained in ascending or descending order to obtain the first power sequence; then according to the number of photovoltaic power generation powers in the sequence, the position of the photovoltaic power generation power in the first power sequence is obtained to obtain the third power information; for example, the first power sequence composed of 100 second power information is extracted according to the 20% position from small to large, that is, in the ascending sequence, the 20th second power information in the sequence is extracted as the third power information, and in the descending sequence, the 80th second power information in the sequence is extracted as the third power information. By extracting a smaller value, it is ensured that the photovoltaic power generation power can be kept above the third power information; and then by intercepting, the influence of the measurement error on the extraction result of the third power information is reduced. Then, according to the load power and its preset fault tolerance value, the first power difference threshold is obtained; wherein, in order to cope with the increase in power demand caused by temporary emergencies during the operation of the load, the present invention sets the demand threshold by setting the fault tolerance value according to a certain ratio. For example, when the load power is 1000W, when the ratio of the fault tolerance value is set to 20%, the fault tolerance value is 200W at this time, that is, the power provided must reach at least 1200W to be considered as meeting the load demand. Finally, it is determined whether the difference between the third power information and the load power exceeds the fault tolerance value, that is, the first power difference threshold. If so, it means that the power generation of the photovoltaic power generation system meets the power supply demand of the load; if not, it means that the power generation of the photovoltaic power generation system does not meet the power supply demand of the load.

[0055] According to an embodiment of the present invention, whether the power supply demand of the load is met according to the first power information and the first power information is specifically: Determining whether the first power information exceeds a preset first power threshold; If yes, obtaining first duration information according to the first power information and the first power information; Determining whether the first duration information exceeds a preset first duration threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

[0056] It should be noted that the first duration information is the sustainable duration for the energy storage device to provide electrical energy to the load. When judging whether the energy storage device meets the load working requirements, first, judge whether the load power exceeds the preset first power threshold; wherein, the first power threshold represents the upper limit of the power that the energy storage device can provide, which is used to improve the safety of the use of the energy storage device. When the power provided by the energy storage device exceeds the upper limit of the power, it is determined that there is a risk of heating and burning. When it is judged that the load power is within the power supply range that the energy storage device can provide, the sustainable duration for the energy storage device to provide electrical energy to the load is calculated based on the first power information of the energy storage device and the load power information, which is recorded as the first duration information. When the first duration information exceeds the preset first duration threshold, it means that the energy storage device can meet the power supply requirements of the load as a power supply. If the first duration information does not exceed the preset first duration threshold, it indicates that the power of the energy storage device is at a low level, and it is necessary to prohibit the energy storage device from providing electrical energy to the load to avoid the situation where the service life is reduced due to excessive discharge of the energy storage device.

[0057] According to an embodiment of the present invention, it also includes: Get power supply mode information; When it is determined that the power supply mode information is the photovoltaic power supply mode or the energy storage power supply mode, the static transfer switch is driven to switch to an off state according to a preset first switch control instruction; When it is determined that the power supply mode information is the power grid power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the power grid access state according to the preset second switch control instruction; When it is determined that the power supply mode information is the diesel power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the diesel passage state according to the preset second switch control instruction.

[0058] It should be noted that the power supply mode information is the power supply mode of the system.

[0059] In this embodiment, when the power supply mode information is judged to be the photovoltaic power supply mode or the energy storage power supply mode, it means that the power supply of the external power supply needs to be cut off. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the disconnected state according to the operation status code in the instruction, so as to achieve the effect of disconnecting the external power supply from the load.

[0060] In another embodiment, when the power supply mode information is judged to be the grid power supply mode, it means that it is necessary to connect the grid in the external power supply to power the load. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the connection state according to the operation status code in the instruction, and by setting a preset second switch control instruction, the automatic transfer switch is driven to switch to the grid access state according to the operation status code in the instruction, so that the load can be circuit-connected with the grid in the external power supply, thereby realizing the grid powering the load.

[0061] In another embodiment, when the power supply mode information is judged to be the diesel power supply mode, it means that it is necessary to connect the diesel generator in the external power supply to power the load. Therefore, by setting a preset first switch control instruction, the static transfer switch is driven to switch to the connection state according to the operation status code in the instruction, and by setting a preset second switch control instruction, the automatic transfer switch is driven to switch to the diesel generator path state according to the operation status code in the instruction, so that the load can be circuit-connected with the diesel generator in the external power supply, thereby realizing diesel power generation to power the load.

[0062] According to an embodiment of the present invention, it also includes: Get power supply mode information; Determine whether the power supply mode information is an energy storage power supply mode; If yes, the energy storage converter is driven to control the energy storage device to discharge according to the preset first discharge control instruction; If not, the energy storage converter is driven to supplement electric energy to the energy storage device according to the preset first charging control instruction.

[0063] It should be noted that, in this embodiment, it is determined whether the power supply mode information is the energy storage power supply mode; if so, it means that the energy storage device discharges to provide electrical energy for the load, so the preset first discharge control instruction is used to drive the energy storage inverter according to the discharge power in the instruction, so that the energy storage device supplies electrical energy to the load; if not, it means that the energy storage device can perform an energy replenishment operation, so the preset first charging instruction is used to drive the energy storage inverter to charge the energy storage device according to the real-time available charging power.

[0064] According to an embodiment of the present invention, it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; acquiring fourth power information; Obtaining second power difference information according to a difference between the fourth power information and the first power information; Determining first power generation deviation value information according to the second power difference value information; According to the first power generation deviation value information, the power generation control amount information is obtained according to a preset feedback control strategy; The power generation power of the diesel generator is adjusted according to the power generation control amount information.

[0065] It should be noted that the fourth power information is the electric power provided by the diesel generator through power generation. In order to avoid the problem that excessive diesel combustion leads to an increase in diesel costs, and insufficient diesel combustion leads to insufficient power generation to support load operation, the present invention is provided with a feedback control strategy to adjust the diesel supply of the diesel generator in real time according to the power generation, so as to achieve adaptive adjustment of the diesel combustion amount. First, the difference between the fourth power information and the first power information is calculated to obtain the second power difference information; in order to cope with the temporary sudden change of load power, the first power generation deviation value information is determined after the preset power fault tolerance value is superimposed on the second power difference information to indicate the difference between the current power generation power of the diesel generator and the target power. Then, according to the first power generation deviation value information, the power generation control amount information is obtained according to the preset feedback control strategy. As an implementation method, the feedback control strategy is PID control. According to the first power generation deviation value information and the proportional coefficient, integral coefficient, and differential coefficient in the PID control, the proportional control amount, integral control amount, and differential control amount are obtained respectively to obtain the power generation control amount information. Finally, according to the power generation control quantity information, the diesel supply of the diesel generator is adjusted. At the same time, the corresponding air injection amount is adjusted according to the diesel supply, so as to realize adaptive adjustment of the power generation power of the diesel generator, thereby ensuring that the power generation power meets the load working requirements while reducing the diesel consumption, thereby reducing the cost of diesel power generation.

[0066] It is worth mentioning that it also includes: Acquire the first power sequence; Obtaining first power average information according to a preset average algorithm according to the amount of the second power information in the first power sequence; Obtaining a first power deviation value according to the first power sequence and the first power mean information; Determining a power deviation threshold according to the first power mean information; Determining whether the first power deviation value is lower than a power deviation threshold; If so, it means that the second power information is in a stable state and can be used as a power supply.

[0067] It should be noted that in the present embodiment, the stability of the second power information is detected to determine whether photovoltaic power generation can be used as a power supply for the load. According to the number of the second power information in the first power sequence, the interception length of the first power sequence is set, and then the first power mean information is calculated according to the intercepted first power sequence to represent the average value of the second power information. Then, according to the second power information in the intercepted first power sequence, the deviation value of the first power mean information is sequentially compared with the deviation value of the first power mean information, and then the mean of the sum of the squares of the deviation values ​​is calculated to obtain the first power deviation value. When the first power deviation value is lower than the preset power deviation threshold, it means that the second power information has a small fluctuation, that is, the stability meets the preset requirements, and can be determined to be in a stable state.

[0068] It is worth mentioning that it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the power grid power supply mode; Acquire the first power information; Determining whether the first power information is lower than a preset first power threshold; If so, the energy storage converter is driven to supply electric energy to the energy storage device according to the preset charging power information.

[0069] It should be noted that, in this embodiment, when the power supply mode information is judged to be the power grid power supply mode, in order to avoid the energy storage device being in a low power state for a long time and affecting the service life of the energy storage device, it is determined whether emergency energy replenishment is required based on the power information of the energy storage device. When the first power information is lower than the preset first power threshold, it means that the power of the energy storage device is in a too low state. At this time, the power grid is set to charge the energy storage device through the energy storage converter according to the preset charging power.

[0070] It is worth mentioning that it also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; Acquire the first power information; Determining whether the first power information is lower than a preset first power threshold; If yes, obtaining fourth power information; According to the fourth power information, the energy storage converter is driven to supplement electric energy to the energy storage device.

[0071] It should be noted that in this embodiment, when the power supply mode information is judged to be the diesel power supply mode, in order to avoid the energy storage device being in a low power state for a long time and affecting the service life of the energy storage device, it is determined whether emergency energy replenishment is required based on the power information of the energy storage device. When the first power information is lower than the preset first power threshold, it means that the power of the energy storage device is too low. At this time, the power generation power of the diesel generator is obtained, and the part of the power generation power that exceeds the load power is set as the charging power of the energy storage inverter, so that the diesel generator can charge the energy storage device through the energy storage inverter.

[0072] The third aspect of the present invention provides a computer-readable storage medium, which includes a smart control method program for a photovoltaic-energy-storage-diesel microgrid. When the smart control method program for a photovoltaic-energy-storage-diesel microgrid is executed by a processor, the steps of the smart control method for a photovoltaic-energy-storage-diesel microgrid as described in any one of the above items are implemented.

[0073] The present invention provides an intelligent control method, system and storage medium for a photovoltaic-storage-diesel microgrid. First, according to first power information and second power information, it is judged whether the power supply demand of the load is met; if so, the photovoltaic power supply mode is entered; if not, it is judged whether the first power grid state information is a power supply state; if so, the power grid power supply mode is entered; if not, according to first electric quantity information and the first power information, it is judged whether the power supply demand of the load is met; if so, the energy storage power supply mode is entered; if not, the diesel power supply mode is entered; the present invention automatically switches the power supply of the load according to the power grid state and the photovoltaic power generation state to ensure the stability of the power supply; and also reduces the electricity cost and improves the cost performance of the power supply by intelligently adjusting the diesel power generation power and the charging and discharging of the energy storage battery.

[0074] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. 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, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent control method for a photovoltaic-storage-diesel microgrid, applied to an intelligent control device for a photovoltaic-storage-diesel microgrid, the device comprising: Automatic transfer switches, static transfer switches and energy storage converters; The automatic transfer switch is a switch for automatically switching power supply, which is used to switch the external power supply to the power grid or the diesel generator; The static transfer switch is a power switch, which is used to switch the external power supply to an on or off state; The energy storage converter is a device that changes the form of electrical energy and is used to control the charging and discharging state of the energy storage device; Characterized in that the method comprises: Acquire first power information and second power information; Determining whether the power supply demand of the load is met according to the first power information and the second power information; If yes, it enters photovoltaic power supply mode; If not, obtaining first power grid state information to determine whether the first power grid state information is a power supply state; If yes, it enters the grid power supply mode; If not, obtaining first power information; Determining whether the power supply demand of the load is met according to the first power information and the first power information; If yes, it enters the energy storage power supply mode; If not, it enters diesel power supply mode.

2. According to claim 1, the intelligent control method of a photovoltaic-storage-diesel microgrid is characterized in that: The determining, according to the first power information and the second power information, whether the power supply demand of the load is met is specifically: According to a preset time period, sequentially collecting and recording the second power information; Obtaining a first power sequence according to the recorded second power information in accordance with a preset sorting rule; According to the quantity of the second power information in the first power sequence, obtaining third power information from the first power sequence according to a preset extraction rule; Obtaining first power difference information according to a difference between the third power information and the first power information; Determining a first power difference threshold according to the first power information; Determining whether the first power difference information is the first power difference threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

3. The intelligent control method of a photovoltaic-storage-diesel microgrid according to claim 1 is characterized in that: The determining, according to the first power information and the first power information, whether the power supply demand of the load is met is specifically: Determining whether the first power information exceeds a preset first power threshold; If yes, obtaining first duration information according to the first power information and the first power information; Determining whether the first duration information exceeds a preset first duration threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

4. The intelligent control method of a photovoltaic-storage-diesel microgrid according to claim 1 is characterized in that: Also includes: Get power supply mode information; When it is determined that the power supply mode information is the photovoltaic power supply mode or the energy storage power supply mode, the static transfer switch is driven to switch to an off state according to a preset first switch control instruction; When it is determined that the power supply mode information is the power grid power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the power grid access state according to the preset second switch control instruction; When it is determined that the power supply mode information is the diesel power supply mode, the static transfer switch is driven to switch to the on state according to the preset first switch control instruction, and the automatic transfer switch is driven to switch to the diesel passage state according to the preset second switch control instruction.

5. The intelligent control method of a photovoltaic-storage-diesel microgrid according to claim 1 is characterized in that: Also includes: Get power supply mode information; Determine whether the power supply mode information is an energy storage power supply mode; If yes, the energy storage converter is driven to control the energy storage device to discharge according to the preset first discharge control instruction; If not, the energy storage converter is driven to supplement electric energy to the energy storage device according to the preset first charging control instruction.

6. The intelligent control method of a photovoltaic-storage-diesel microgrid according to claim 1 is characterized in that: Also includes: Get power supply mode information; When it is determined that the power supply mode information is in the diesel power supply mode; acquiring fourth power information; Obtaining second power difference information according to a difference between the fourth power information and the first power information; Determining first power generation deviation value information according to the second power difference value information; According to the first power generation deviation value information, the power generation control amount information is obtained according to a preset feedback control strategy; The power generation power of the diesel generator is adjusted according to the power generation control amount information.

7. An intelligent control system for a photovoltaic-storage-diesel microgrid, applied to an intelligent control device for a photovoltaic-storage-diesel microgrid, the device comprising: Automatic transfer switches, static transfer switches and energy storage converters; The automatic transfer switch is a switch for automatically switching power supply, which is used to switch the external power supply to the power grid or the diesel generator; The static transfer switch is a power switch, which is used to switch the external power supply to an on or off state; The energy storage converter is a device that changes the form of electrical energy and is used to control the charging and discharging state of the energy storage device; The system includes a memory and a processor, wherein the memory includes an intelligent control method program for a photovoltaic-storage-diesel microgrid, and when the intelligent control method program for the photovoltaic-storage-diesel microgrid is executed by the processor, the following steps are implemented: Acquire first power information and second power information; Determining whether the power supply demand of the load is met according to the first power information and the second power information; If yes, it enters photovoltaic power supply mode; If not, obtaining first power grid state information to determine whether the first power grid state information is a power supply state; If yes, it enters the grid power supply mode; If not, obtaining first power information; Determining whether the power supply demand of the load is met according to the first power information and the first power information; If yes, it enters the energy storage power supply mode; If not, it enters diesel power supply mode.

8. The intelligent control system of a photovoltaic-storage-diesel microgrid according to claim 7 is characterized in that: The determining, according to the first power information and the second power information, whether the power supply demand of the load is met is specifically: According to a preset time period, sequentially collecting and recording the second power information; Obtaining a first power sequence according to the recorded second power information in accordance with a preset sorting rule; According to the quantity of the second power information in the first power sequence, obtaining third power information from the first power sequence according to a preset extraction rule; Obtaining first power difference information according to a difference between the third power information and the first power information; Determining a first power difference threshold according to the first power information; Determining whether the first power difference information is the first power difference threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

9. The intelligent control system of a photovoltaic-storage-diesel microgrid according to claim 7 is characterized in that: The determining, according to the first power information and the first power information, whether the power supply demand of the load is met is specifically: Determining whether the first power information exceeds a preset first power threshold; If yes, obtaining first duration information according to the first power information and the first power information; Determining whether the first duration information exceeds a preset first duration threshold; If yes, it means that the power supply demand of the load is met; If not, it means that the power supply demand of the load is not met.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer-readable storage medium includes a smart control method program for a photovoltaic, diesel-energy-storage microgrid. When the smart control method program for a photovoltaic, diesel-energy-storage microgrid is executed by a processor, the steps of the smart control method for a photovoltaic, diesel-energy-storage microgrid as described in any one of claims 1 to 6 are implemented.

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