Power dispatching method, device and equipment of optical storage micro-grid system and medium

Abstract

The invention discloses a power dispatching method, device and equipment for an optical storage micro-grid system and a medium, and belongs to the technical field of power dispatching. The method comprises the following steps: acquiring source network load storage resource data of a micro-grid system; based on the source network load storage resource data of the micro-grid system, obtaining the off-grid power of a tie line between the micro-grid system and the large power grid; according to the off-grid power of the tie line, selecting a photovoltaic maximum consumption strategy or a tie line control strategy to perform power dispatching of the micro-grid system; according to the tie line control strategy, the off-grid power of a tie line is adjusted by controlling one or more of photovoltaic equipment, energy storage equipment and load equipment. According to the power dispatching method provided by the invention, the load impact of the micro-grid system on a large power grid can be reduced, the utilization rate of energy storage equipment is improved, power generation and load fluctuation are stabilized, various resource configurations of source grid load storage in the micro-grid system are optimized, and the stability and economical efficiency of operation of the micro-grid system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power dispatching, and relates to a power dispatching method, device, equipment and medium for a photovoltaic storage microgrid system. Background Art

[0002] Microgrid systems for load-side renewable energy projects typically include power generation, grid, load, and storage elements, and are connected to the main grid. A certain proportion of renewable energy (primarily photovoltaics) and energy storage are incorporated within the microgrid system, enabling the microgrid to generate and consume a certain percentage of its own electricity, reducing power purchases from the main grid. However, the proportion of renewable energy and energy storage is insufficient to achieve self-consumption of all the electricity for the entire microgrid system, requiring connection to the main grid, which provides stable support and a certain proportion of electricity. Microgrids whose renewable energy source is photovoltaics and include energy storage are defined as grid-connected, source-grid-load-storage microgrids.

[0003] At present, most grid-connected photovoltaic-storage source-grid-load-storage microgrid systems are equipped with energy management systems, which can realize real-time monitoring and control of various information of source, grid, load and storage. However, in terms of power dispatching, the strategy is relatively simple, basically focusing on full photovoltaic power generation, without considering the constraints between the microgrid system and the large power grid. It is very easy to reversely send power to the large power grid when photovoltaic power generation is large and the load is small. When the photovoltaic output is weak and the load is large, the large power grid needs to provide large power support, causing load impact on the large power grid; at the same time, the energy storage equipment in the microgrid system only serves as an emergency power supply, with low utilization rate, and fails to play its role in smoothing fluctuations; and the load in the microgrid system is usually not controlled, and the regulatory role of flexible load and tertiary load in the microgrid system cannot be played. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a power dispatching method, device, equipment and medium for a photovoltaic-storage microgrid system, thereby improving the coordinated control capability of various types of source, grid, load and storage resources within the photovoltaic-storage microgrid system and optimizing resource allocation.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a power dispatching method for a photovoltaic storage microgrid system, comprising:

[0007] Acquiring source, grid, load and storage resource data of the microgrid system;

[0008] Based on the source, grid, load and storage resource data of the microgrid system, obtaining the off-grid power of the tie line between the microgrid system and the large power grid;

[0009] According to the off-grid power of the tie line, a photovoltaic maximum absorption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system;

[0010] Among them, the photovoltaic maximum absorption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

[0011] Furthermore, the off-grid power of the tie line between the microgrid system and the large grid The calculation formula is:

[0012] ,

[0013] in, Represents the active power of the load equipment in the microgrid system; Represents the active power of the photovoltaic collection line in the microgrid system; Represents the active power of the energy storage device in the microgrid system. If the energy storage device is discharged, is positive, if the energy storage device is charged, then is negative.

[0014] Furthermore, based on the off-grid power of the tie line, a photovoltaic maximum absorption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system, including:

[0015] Assume that the lower limit of the off-grid power agreed between the microgrid system and the large grid is , the upper limit is ;

[0016] if , select the photovoltaic maximum absorption strategy for power dispatching of the microgrid system;

[0017] if or , the tie-line control strategy is selected for power dispatching of the microgrid system.

[0018] Furthermore, the photovoltaic maximum absorption strategy also includes: calculating the maximum power generation power of the photovoltaic equipment and the load equipment power in the current period; obtaining the power deviation between the maximum power generation power of the photovoltaic equipment and the load equipment power; when the power deviation is greater than a preset threshold When the battery is fully charged, the energy storage device is controlled to charge.

[0019] Furthermore, if , the tie line control strategy is used to dispatch the power of the microgrid system, including:

[0020] Evaluate the upward control capability of solar and energy storage resources in the current period, including:

[0021] ,

[0022] in, The power deviation between the upward control capability of the solar-storage resource in the current period and the upper limit of the off-grid power; is the sum of the active power that can be adjusted by the photovoltaic equipment. The active power that the energy storage device can discharge; The power going off the grid exceeds the upper limit. ;

[0023] if Greater than the preset threshold , the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment and / or controlling the discharge of the energy storage equipment;

[0024] if Less than or equal to the preset threshold , by reducing the load power To carry out power dispatching of the microgrid system.

[0025] Furthermore, if If the power consumption of the microgrid system exceeds a preset threshold, the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment and / or controlling the discharge of the energy storage device, including:

[0026] Evaluate the upward control capability of photovoltaic equipment in the current period, including:

[0027] ,

[0028] in, The power deviation between the upward control capability of the photovoltaic equipment and the upper limit of the grid power in the current period;

[0029] if Greater than the preset threshold , the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment;

[0030] if Less than or equal to the preset threshold , the power dispatch of the microgrid system is carried out by increasing the output of photovoltaic equipment and controlling the discharge of energy storage equipment.

[0031] Furthermore, if , the tie line control strategy is used to dispatch the power of the microgrid system, including:

[0032] Evaluate the downward adjustment control capability of solar and energy storage resources in the current period, including:

[0033] ,

[0034] in, The power deviation between the downward control capability of the solar-storage resource in the current period and the grid-connected power under-limit value; is the sum of the active power that can be reduced by the photovoltaic equipment. Active power that can charge energy storage devices; The power going off the grid exceeds the limit. ;

[0035] if Greater than the preset threshold , the power dispatch of the microgrid system is performed by reducing the output of the photovoltaic equipment and / or controlling the charging of the energy storage device, including:

[0036] Evaluate the downward control capability of energy storage equipment during the current period, including:

[0037] ,

[0038] in, The power deviation between the energy storage device's downward control capability and the grid-connected power under-limit value during the current period;

[0039] if Greater than the preset threshold , then the power dispatch of the microgrid system is performed by controlling the charging of the energy storage device;

[0040] if Less than or equal to the preset threshold , the power dispatch of the microgrid system is carried out by reducing the output of photovoltaic equipment and controlling the charging of energy storage equipment.

[0041] In a second aspect, the present invention further provides a power dispatching device for a photovoltaic-storage microgrid system, the device comprising:

[0042] A resource data acquisition module is used to obtain the source, grid, load and storage resource data of the microgrid system;

[0043] The off-grid power acquisition module is used to obtain the off-grid power of the tie line between the microgrid system and the large power grid based on the source, grid, load and storage resource data of the microgrid system;

[0044] A power dispatching strategy selection module is used to select a photovoltaic maximum absorption strategy or a tie line control strategy to perform power dispatching of the microgrid system according to the off-grid power of the tie line;

[0045] Among them, the photovoltaic maximum absorption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

[0046] In a third aspect, the present invention further provides a computer device, comprising:

[0047] memory for storing computer programs;

[0048] A processor is used to execute the computer program to implement the steps of the above-mentioned power dispatching method for the photovoltaic storage microgrid system.

[0049] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the steps of the above-mentioned power dispatching method of the photovoltaic storage microgrid system.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The power dispatching method of the photovoltaic storage microgrid system provided by the present invention is based on the off-grid power of the tie line between the microgrid system and the large power grid, and is divided into two power dispatching modes: photovoltaic maximum absorption strategy or tie line control strategy. Under the photovoltaic maximum absorption strategy, the photovoltaic power is controlled to always maintain the maximum power generation state in the current period, and the excess power generation is stored through energy storage to achieve maximum photovoltaic energy absorption, reduce the power drawn by the microgrid system from the large power grid, and improve the economic efficiency of the microgrid system; under the tie line control strategy, the power dispatching of the microgrid system is carried out by controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment, so as to adjust the off-grid power of the tie line to keep it within a reasonable range agreed with the large power grid, avoid the impact and assessment costs brought to the large power grid due to the tie line power exceeding the limit, and can also improve the utilization rate of energy storage equipment, smooth out power generation and load fluctuations, optimize the configuration of various types of source, grid, load and storage resources within the microgrid system, and improve the stability and economy of the microgrid system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic flow chart of a power dispatching method for a photovoltaic storage microgrid system provided by an embodiment of the present invention;

[0053] Figure 2 is another flow chart of the power dispatching method in an embodiment of the present invention;

[0054] Figure 3 Schematic diagram of the process of the maximum photovoltaic absorption strategy in an embodiment of the present invention;

[0055] Figure 4 Schematic diagram of the process of the tie line control strategy in an embodiment of the present invention;

[0056] Figure 5 Schematic diagram of the process of power dispatching through solar-storage resources using the tie-line control strategy in an embodiment of the present invention;

[0057] Figure 6 A schematic diagram of a process for performing power dispatching through load equipment using a tie-line control strategy according to an embodiment of the present invention;

[0058] Figure 7 A schematic diagram of the structure of a power dispatching device for a photovoltaic storage microgrid system provided by an embodiment of the present invention;

[0059] Figure 8 This is a diagram of the internal structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations of the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0061] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0062] Example 1:

[0063] Figures 1 to 6 As shown, the embodiment of the present invention provides a power dispatching method for a photovoltaic storage microgrid system. Figure 1 This is a flow chart of the power dispatching method of the photovoltaic storage microgrid system. This flow chart only shows the logical sequence of the method described in this embodiment. Under the premise of no conflict, in other possible embodiments of the present invention, different methods can be used. Figure 1 The steps shown or described are accomplished in the order shown.

[0064] The power dispatching method for the photovoltaic storage microgrid system provided in this embodiment can be applied to the terminal and can be executed by the power dispatching device of the photovoltaic storage microgrid system. The device can be implemented by software and / or hardware, and the device can be integrated into the terminal.

[0065] See also Figure 1The method of the embodiment of the present invention specifically includes the following steps 1 to 3. Among them:

[0066] Step 1: Obtain source, grid, load and storage resource data of the microgrid system.

[0067] Most PV-based, grid-based, load-storage microgrid systems are equipped with an energy management system, enabling real-time monitoring and control of various information related to the source, grid, load, and storage. Data on the microgrid's source (power source), grid (power grid), load (load), and storage (energy storage) resources can be collected through the energy management system's terminals. This data can then be monitored, identified, and anomalies handled.

[0068] Step 2: Based on the source, grid, load and storage resource data of the microgrid system, obtain the off-grid power of the tie line between the microgrid system and the large power grid.

[0069] Based on the source, grid, load and storage resource data after detection and repair, the operating status of the interconnection line between the microgrid system and the large grid is analyzed. Through power flow analysis technology, it is determined whether the microgrid is drawing power from or supplying power to the large grid during the current period, and the off-grid power of the interconnection line between the microgrid system and the large grid is obtained. The off-grid power represents the amount of power drawn by the microgrid system from the large grid.

[0070] The off-grid power of the tie line between the microgrid system and the large grid , which is the sum of the power flow of the tie line (unit: MW), is calculated as follows:

[0071] ,

[0072] in, Represents the active power of the load equipment in the microgrid system; Represents the active power of the photovoltaic collection line in the microgrid system; Represents the active power of the energy storage device in the microgrid system. If the energy storage device is discharged, is positive, if the energy storage device is charged, then is negative.

[0073] Step 3: According to the off-grid power of the tie line, a photovoltaic maximum absorption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system.

[0074] like Figure 2 As shown, it is assumed that the lower limit of the off-grid power agreed between the microgrid system and the large grid is , the upper limit is , based on the off-grid power of the tie line , selecting a photovoltaic maximum absorption strategy or a tie-line control strategy to perform power dispatching of the microgrid system, including:

[0075] if , select the photovoltaic maximum absorption strategy for power dispatching of the microgrid system;

[0076] if or , the tie-line control strategy is selected for power dispatching of the microgrid system.

[0077] Among them, Figure 3 As shown, the photovoltaic maximum absorption strategy also includes:

[0078] Calculate the maximum power generation of the photovoltaic equipment in the current period and load equipment power ;

[0079] Obtain the power deviation between the maximum power generation power of the photovoltaic device and the load device power ,include:

[0080] ;

[0081] when Greater than the preset threshold When , it means that the photovoltaic power generation in the current period is about to exceed the load power consumption, and it is necessary to control the charging of the energy storage device to absorb the excess power.

[0082] The photovoltaic maximum absorption strategy achieves maximum absorption of photovoltaic energy by controlling photovoltaics to always maintain the maximum power generation state in the current period and storing excess power generation through energy storage, reducing the power consumption of the microgrid system from the large power grid and improving the economy of the microgrid system.

[0083] like Figure 4 As shown, regardless or The interconnection line control strategy of the present invention first evaluates the coordinated control capability of the photovoltaic and energy storage resources (photovoltaic equipment and energy storage equipment) in the current period, including the upward control capability and downward control capability of the photovoltaic and energy storage resources. If the coordinated control capability of the photovoltaic and energy storage resources in the current period is sufficient, power dispatch is performed through the photovoltaic and energy storage resources; if the coordinated control capability of the photovoltaic and energy storage resources in the current period is insufficient, power dispatch is performed through the load equipment.

[0084] Among them, Figure 5 As shown, if , the tie line control strategy is used to dispatch the power of the microgrid system, including:

[0085] Evaluate the upward control capability of solar and energy storage resources in the current period, including:

[0086] ,

[0087] in, The power deviation between the upward control capability of the solar-storage resource in the current period and the upper limit of the off-grid power; is the sum of the active power that can be adjusted by the photovoltaic equipment. The active power that the energy storage device can discharge; The power going off the grid exceeds the upper limit. .

[0088] if Greater than the preset threshold , indicating that the upward control capability of the photovoltaic and energy storage resources in the current period is sufficient, the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment and / or controlling the discharge of the energy storage equipment to solve the problem of excessive power off-grid.

[0089] if Less than or equal to the preset threshold , indicating that the current period of solar storage resources upward control capability is insufficient, so by reducing the load power To carry out power dispatching of the microgrid system to solve the problem of grid power exceeding the limit.

[0090] The power dispatching of the microgrid system by increasing the output of the photovoltaic equipment and / or controlling the discharge of the energy storage device specifically includes:

[0091] Evaluate the upward control capability of photovoltaic equipment in the current period, including:

[0092] ,

[0093] in, It is the power deviation between the upward control capability of the photovoltaic equipment in the current period and the upper limit of the grid power.

[0094] if Greater than the preset threshold , indicating that the photovoltaic equipment has sufficient upward control capability in the current period, the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment to solve the problem of excessive power off-grid.

[0095] if Less than or equal to the preset threshold , indicating that the photovoltaic equipment's control capability for increasing power is insufficient during the current period, the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment and controlling the discharge of the energy storage equipment to solve the problem of excessive power off-grid.

[0096] like Figure 6 As shown, the load power reduction The method includes: giving priority to reducing the flexible load in the microgrid system, and then reducing the tertiary load.

[0097] In addition, if the load power is reduced If the problem of power outage exceeding the limit still cannot be solved, it means that the microgrid system is in an abnormal state and must be handled according to the abnormal state plan.

[0098] Back to Figure 5 ,if , the tie line control strategy is used to dispatch the power of the microgrid system, including:

[0099] Evaluate the downward adjustment control capability of solar and energy storage resources in the current period, including:

[0100] ,

[0101] in, The power deviation between the downward control capability of the solar-storage resource in the current period and the grid-connected power under-limit value; is the sum of the active power that can be reduced by the photovoltaic equipment. Active power that can charge energy storage devices; The power going off the grid exceeds the limit. .

[0102] if Greater than the preset threshold , indicating that the control capability of photovoltaic and energy storage resources is sufficient in the current period, the power dispatch of the microgrid system is performed by reducing the output of photovoltaic equipment and / or controlling the charging of energy storage equipment to solve the problem of excessive power off-grid.

[0103] if Less than or equal to the preset threshold , indicating that the control capability of the solar-storage resource downward adjustment in the current period is insufficient, and a load increase scenario is required. The load increase is manually adjusted according to production and living needs, and is not within the scope of consideration of the interconnection line control strategy of the present invention.

[0104] The power dispatching of the microgrid system by reducing the output of the photovoltaic equipment and / or controlling the charging of the energy storage device specifically includes:

[0105] Evaluate the downward control capability of energy storage equipment during the current period, including:

[0106] ,

[0107] in, It is the power deviation between the downward control capability of the energy storage device in the current period and the power limit of the grid disconnection.

[0108] if Greater than the preset threshold , indicating that the energy storage device has sufficient control capability for down-regulation in the current period, the power dispatch of the microgrid system is performed by controlling the charging of the energy storage device to solve the problem of out-of-grid power exceeding the limit;

[0109] if Less than or equal to the preset threshold , indicating that the energy storage device has insufficient control capability in the current period, the power dispatch of the microgrid system is carried out by controlling the charging of the energy storage device and reducing the output of the photovoltaic device to solve the problem of excessive power off-grid.

[0110] Under the tie line control strategy, the power dispatch of the microgrid system is carried out by controlling one or more devices among photovoltaic equipment, energy storage equipment and load equipment. Its essence is to adjust and Size, and adjustment The size and positive and negative of the tie line are used to adjust the power of the tie line. , so that it remains within the reasonable range agreed in advance with the large power grid.

[0111] Under the tie-line control strategy, over-limit off-grid power is addressed primarily through coordinated PV-storage control, followed by load control, prioritizing production and household load demands. During coordinated PV-storage control, output increases are primarily achieved through PV, with energy storage added when PV capacity is insufficient. Output decreases are primarily achieved through energy storage, with PV added when energy storage is insufficient. This improves the utilization rate of energy storage equipment and leverages its regulatory role in smoothing fluctuations. During load control, flexible loads are prioritized for reduction, followed by tertiary load reduction, prioritizing the energy demand of critical loads while leveraging load regulation, making the entire microgrid more flexible and diverse in its regulation methods.

[0112] Example 2:

[0113] Based on the same inventive concept as Example 1, this embodiment of the present invention further provides a power dispatching device for a photovoltaic microgrid system for implementing the aforementioned power dispatching method for a photovoltaic microgrid system. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of the power dispatching device for a photovoltaic microgrid system provided below can be found in the aforementioned limitations of the power dispatching method for a photovoltaic microgrid system, and will not be further elaborated here.

[0114] like Figure 7 As shown, an embodiment of the present invention provides a power dispatching device for a photovoltaic storage microgrid system, comprising:

[0115] A resource data acquisition module is used to obtain the source, grid, load and storage resource data of the microgrid system;

[0116] The off-grid power acquisition module is used to obtain the off-grid power of the tie line between the microgrid system and the large power grid based on the source, grid, load and storage resource data of the microgrid system;

[0117] A power dispatching strategy selection module is used to select a photovoltaic maximum absorption strategy or a tie line control strategy to perform power dispatching of the microgrid system according to the off-grid power of the tie line;

[0118] Among them, the photovoltaic maximum absorption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

[0119] Example 3:

[0120] The embodiment of the present invention further provides a computer device, which may be a server, and its internal structure diagram may be as shown in FIG. Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements the power dispatching method of the photovoltaic storage microgrid system in the aforementioned embodiment.

[0121] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0122] Example 4:

[0123] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the following method:

[0124] Acquiring source, grid, load and storage resource data of the microgrid system;

[0125] Based on the source, grid, load and storage resource data of the microgrid system, obtaining the off-grid power of the tie line between the microgrid system and the large power grid;

[0126] According to the off-grid power of the tie line, a photovoltaic maximum absorption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system;

[0127] Among them, the photovoltaic maximum absorption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

[0128] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0129] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0132] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all protected by the present invention.

Claims

1. A power dispatching method for a photovoltaic storage microgrid system, characterized in that: include: Acquire source, grid, load and storage resource data of the microgrid system; Based on the source, grid, load and storage resource data of the microgrid system, obtaining the off-grid power of the tie line between the microgrid system and the large grid; According to the off-grid power of the tie line, a photovoltaic maximum consumption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system; Among them, the photovoltaic maximum consumption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

2. The power dispatching method of the photovoltaic storage microgrid system according to claim 1 is characterized in that: The off-grid power of the tie line between the microgrid system and the large grid The calculation formula is: ， in, Represents the active power of load equipment in the microgrid system; Represents the active power of the photovoltaic collection line in the microgrid system; Represents the active power of the energy storage device in the microgrid system. If the energy storage device is discharged, is positive, if the energy storage device is charged, then is negative.

3. The power dispatching method of the photovoltaic storage microgrid system according to claim 2 is characterized in that: Based on the off-grid power of the tie line, a photovoltaic maximum consumption strategy or a tie line control strategy is selected to perform power dispatching of the microgrid system, including: Assume that the lower limit of the off-grid power agreed between the microgrid system and the large grid is , the upper limit is ; if , select the photovoltaic maximum consumption strategy to carry out power dispatching of the microgrid system; if or , the tie-line control strategy is selected for power dispatching of the microgrid system.

4. The power dispatching method of the photovoltaic storage microgrid system according to claim 3 is characterized in that: The photovoltaic maximum consumption strategy also includes: calculating the maximum power generation power of the photovoltaic equipment and the load equipment power in the current period; obtaining the power deviation between the maximum power generation power of the photovoltaic equipment and the load equipment power; when the power deviation is greater than a preset threshold When the battery is fully charged, the energy storage device is controlled to charge.

5. The power dispatching method of the photovoltaic storage microgrid system according to claim 3 is characterized in that: if , the tie line control strategy is used to dispatch the power of the microgrid system, including: Evaluate the upward control capability of solar energy storage resources in the current period, including: ， in, The power deviation between the upward control capability of the solar energy storage resources in the current period and the upper limit of the off-grid power; is the sum of the active power that can be adjusted up by the photovoltaic equipment. The active power that the energy storage device can discharge; The power of the off-grid exceeds the limit. ; if Greater than the preset threshold , the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment and / or controlling the discharge of the energy storage equipment; if Less than or equal to the preset threshold , by reducing the load power To carry out power dispatching of the microgrid system.

6. The power dispatching method of the photovoltaic storage microgrid system according to claim 5 is characterized in that: if If the power consumption of the microgrid system is greater than a preset threshold, the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic device and / or controlling the discharge of the energy storage device, including: Evaluate the upward control capability of photovoltaic equipment in the current period, including: ， in, The power deviation between the upward control capability of the photovoltaic equipment and the upper limit of the off-grid power in the current period; if Greater than the preset threshold , the power dispatch of the microgrid system is performed by increasing the output of the photovoltaic equipment; if Less than or equal to the preset threshold , the power dispatch of the microgrid system is carried out by increasing the output of photovoltaic equipment and controlling the discharge of energy storage equipment.

7. The power dispatching method of the photovoltaic storage microgrid system according to claim 3 is characterized in that: if , the tie line control strategy is used to dispatch the power of the microgrid system, including: Evaluate the downward control capability of solar and energy storage resources in the current period, including: ， in, The power deviation between the downward adjustment control capability of the solar energy storage resources in the current period and the power under-limit value of the off-grid power; is the sum of the active power that the photovoltaic equipment can adjust down. Active power that can charge the energy storage device; The power of the grid drops below the limit. ; if Greater than the preset threshold , the power dispatch of the microgrid system is performed by reducing the output of the photovoltaic equipment and / or controlling the charging of the energy storage device, including: Evaluate the downward control capability of energy storage equipment during the current period, including: ， in, The power deviation between the downward control capability of the energy storage device in the current period and the power under-limit value of the off-grid power; if Greater than the preset threshold , the power dispatch of the microgrid system is performed by controlling the charging of the energy storage device; if Less than or equal to the preset threshold , the power dispatch of the microgrid system is carried out by reducing the output of photovoltaic equipment and controlling the charging of energy storage equipment.

8. A power dispatching device for a photovoltaic storage microgrid system, characterized in that: include: A resource data acquisition module, used to acquire source, grid, load and storage resource data of the microgrid system; A power acquisition module for obtaining the power of the interconnection line between the microgrid system and the large power grid based on the source, grid, load and storage resource data of the microgrid system; A power dispatching strategy selection module is used to select a photovoltaic maximum consumption strategy or a tie line control strategy to perform power dispatching of the microgrid system according to the off-grid power of the tie line; Among them, the photovoltaic maximum consumption strategy includes controlling the photovoltaic equipment to generate electricity at the maximum power in the current period; the interconnection line control strategy includes controlling one or more devices among photovoltaic equipment, energy storage equipment, and load equipment to adjust the grid-connected power of the interconnection line.

9. A computer device, characterized in that: include: Memory for storing computer programs; A processor is used to execute the computer program to implement the steps of the power dispatching method for a photovoltaic storage type microgrid system according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the power dispatching method of the photovoltaic storage type microgrid system described in any one of claims 1 to 7 are implemented.

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