Photovoltaic and energy storage integrated distributed energy system with controllable power output and control method thereof

Abstract

The present invention discloses a photovoltaic-storage integrated distributed energy system with controllable power output and a control method thereof. The energy system includes: a plurality of photovoltaic power generation components connected in series and arranged in a distributed manner; each photovoltaic panel component corresponds to each energy storage battery component one by one and is connected in parallel; a circuit management component realizes bypassing of the energy storage battery component and / or the photovoltaic power generation component respectively through a controllable switch; a system control component compares the total grid-connected power demand at a preset time with the sum of the maximum output power values ​​of a plurality of photovoltaic power generation components, and controls each photovoltaic power generation component and the corresponding energy storage battery component to output corresponding power to the distribution network according to a preset strategy through each circuit management component based on the comparison result. By arranging an energy storage battery component at each photovoltaic panel component, the safety risk problem existing in the centralized energy storage system is overcome, and the grid-connected output power is constant through the photovoltaic power generation component and the corresponding energy storage battery component when the grid-connected power demand changes.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution network control, and in particular to a photovoltaic-storage integrated distributed energy system with controllable power output and a control method thereof. Background Art

[0002] The current distributed energy structure is a diversified and efficient system, which mainly includes two key parts: photovoltaic system and energy storage system. This structure is designed to maximize the use of renewable energy while ensuring the stability and reliability of energy supply.

[0003] First of all, the photovoltaic system is an important part of the distributed energy structure. It uses the photovoltaic effect to directly convert sunlight into electrical energy. The photovoltaic system is usually composed of photovoltaic panels, inverters, brackets and cables. The photovoltaic panels are responsible for absorbing sunlight and generating direct current, and the inverter converts direct current into alternating current. The application scale of the photovoltaic system can range from small household power supply systems to large solar power stations, and can be flexibly configured according to specific needs.

[0004] Secondly, energy storage systems play a vital role in distributed energy structures. Since renewable energy sources such as solar and wind energy are intermittent and unstable, energy storage systems can store energy when there is excess energy production and release energy when demand peaks or energy shortages occur. Energy storage systems usually use battery energy storage technology, such as lithium-ion batteries. These batteries have the characteristics of high energy density, long cycle life, and fast charging and discharging, which can meet the needs of distributed energy systems.

[0005] In the distributed energy structure, photovoltaic systems and energy storage systems usually cooperate with each other to form a complete energy supply system. The electricity generated by the photovoltaic system first meets the immediate demand, and the excess is stored by the energy storage system. When the photovoltaic system cannot meet the demand, the energy storage system releases the stored energy to ensure the continuity of energy supply. This structure not only improves energy utilization efficiency, but also reduces dependence on traditional energy, which helps to achieve sustainable development.

[0006] At present, the construction of photovoltaic systems and energy storage systems is independent. They are not built as a whole or integrated unit. They cannot communicate and interact in more details, and the energy storage systems are created independently.

[0007] The output power of a single photovoltaic system fluctuates due to multiple factors such as light intensity, temperature and shadow, showing instability and is sometimes regarded as "junk power". However, with the advancement of technology, we can effectively manage and utilize photovoltaic power through energy storage systems, prediction models and scheduling algorithms, smooth out its fluctuations and enhance its value in the power system.

[0008] Safety risk is an important issue faced by centralized energy storage systems. As the energy storage capacity increases, the number of battery packs also increases accordingly, making the entire system more complex and increasing safety risks. For example, accidents such as internal battery short circuits, overheating, fires, and even explosions may occur, posing a threat to the safety of personnel and equipment. Summary of the invention

[0009] The purpose of the embodiment of the present invention is to provide a photovoltaic-storage integrated distributed energy system with controllable power output and a control method thereof. By means of dispersed photovoltaic power generation components and corresponding energy storage battery components, the safety risk problem existing in the centralized energy storage system is overcome. When the grid-connected power demand changes, the photovoltaic power generation components and the corresponding energy storage battery components cooperate to provide controllable and stable power output, thereby achieving constant grid-connected output power.

[0010] In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides a photovoltaic-storage integrated distributed energy system with controllable power output, comprising: a plurality of photovoltaic power generation components, a plurality of energy storage battery components, a plurality of circuit management components and a system control component;

[0011] The plurality of photovoltaic power generation components are connected in series and then connected to a power distribution network, and are arranged in a distributed manner;

[0012] Each of the photovoltaic power generation components corresponds to each of the energy storage battery components one by one and is connected in parallel;

[0013] The circuit management component is electrically connected to the energy storage battery component and the photovoltaic power generation component respectively and corresponds to each other, and the energy storage battery component and / or the photovoltaic power generation component are bypassed respectively through a controllable switch;

[0014] The system control component compares the total grid-connected power demand received at a preset time with the sum of the maximum output power values ​​of the plurality of photovoltaic power generation components, and based on the comparison result and in accordance with a preset strategy, controls each photovoltaic power generation component and the corresponding energy storage battery component to output corresponding power to the distribution network through each circuit management component.

[0015] Accordingly, a second aspect of an embodiment of the present invention provides a control method for a photovoltaic-storage integrated distributed energy system with controllable power output, comprising the following steps:

[0016] Receiving the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at a preset time, and obtaining the maximum power value that each photovoltaic power generation component can output at the preset time;

[0017] Comparing the sum of the maximum power values ​​of the plurality of photovoltaic power generation components with the total grid-connected power demand;

[0018] When the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is less than the total grid-connected power demand, controlling the plurality of photovoltaic power generation components and the plurality of energy storage battery components to perform grid-connected power generation according to a first preset power allocation rule;

[0019] When the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is greater than or equal to the total grid-connected power demand, the plurality of photovoltaic power generation components are controlled to perform grid-connected power generation according to a second preset power allocation rule.

[0020] Further, controlling the plurality of photovoltaic power generation components and the plurality of energy storage battery components to generate power in grid connection according to a first preset power allocation rule comprises:

[0021] Obtaining the remaining power of each of the energy storage battery components at the preset time;

[0022] Determine the output power of each energy storage battery assembly at the preset time based on the remaining power of each energy storage battery assembly;

[0023] The output power of the energy storage battery assembly is proportional to its remaining power.

[0024] Furthermore, the first preset power allocation rule is specifically:

[0025]

[0026] Wherein, P(t) is the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at the preset time t, is the maximum power value of the i-th photovoltaic power generation component at the preset time t, N is the number of photovoltaic power generation components in the photovoltaic storage integrated distributed energy system, 1≤i≤N, is the output power value of the ith photovoltaic power generation component at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th energy storage battery assembly at the preset time t, is the remaining power of the i-th energy storage battery assembly at the preset time t, is the power flow coefficient of the ith energy storage battery assembly at the preset time t.

[0027] Furthermore, in the first preset power allocation rule, the priority of the output power of the photovoltaic power generation component is higher than the priority of the output power of the energy storage battery component.

[0028] Furthermore, in the first preset power allocation rule, the priority of the output power of the energy storage battery assembly with a high remaining power is higher than the priority of the output power of the energy storage battery assembly with a low remaining power.

[0029] Furthermore, the controlling the plurality of photovoltaic power generation components to perform grid-connected power generation according to a second preset power allocation rule comprises:

[0030] Acquire the maximum power values ​​of the plurality of photovoltaic power generation components, and sort the plurality of maximum power values ​​in descending order;

[0031] Selecting a number of photovoltaic power generation components whose maximum power values ​​are greater than a power threshold according to the ranking to perform grid-connected power generation;

[0032] The photovoltaic power generation components that are not connected to the grid for power generation are controlled to bypass and charge the corresponding energy storage battery components respectively.

[0033] Furthermore, the second preset power allocation rule is specifically:

[0034]

[0035] Wherein, P(t) is the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th photovoltaic power generation component at the preset time t;

[0036] Select a number of photovoltaic power generation components whose sum of maximum output power values ​​is greater than the minimum total grid-connected power demand, set their connection state coefficients to 1, and set the connection state coefficients of the remaining photovoltaic power generation components to 0.

[0037] Furthermore, after selecting the plurality of photovoltaic power generation components having the maximum power value greater than the power threshold according to the sorting for grid-connected power generation, the method further includes:

[0038] The power generation power exceeding the grid-connected power demand of the photovoltaic power generation assembly is used to charge the corresponding energy storage battery assembly.

[0039] Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned control method for controlling a photovoltaic-storage integrated distributed energy system with controllable power output.

[0040] Accordingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned control method for a photovoltaic-storage integrated distributed energy system with controllable power output.

[0041] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0042] Through the decentralized installation of photovoltaic power generation components and corresponding energy storage battery components, the safety risk problems existing in the centralized energy storage system are overcome. When the grid-connected power demand changes, the photovoltaic power generation components and the corresponding energy storage battery components cooperate to provide controllable and stable power output, thereby achieving constant grid-connected output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the principle of a photovoltaic-storage integrated distributed energy system provided by an embodiment of the present invention;

[0044] Figure 2 It is a flow chart of a control method for a photovoltaic-storage integrated distributed energy system with controllable power output provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0046] Please refer to Figure 1 According to a first aspect of an embodiment of the present invention, there is provided a photovoltaic-storage integrated distributed energy system with controllable power output, comprising: a plurality of photovoltaic power generation components, a plurality of energy storage battery components, a plurality of circuit management components and a system control component; the plurality of photovoltaic power generation components are connected in series and then connected to a distribution network, and are arranged in a distributed manner; each photovoltaic power generation component corresponds to each energy storage battery component one by one and are connected in parallel; the circuit management component is electrically connected to the energy storage battery component and the photovoltaic power generation component respectively and corresponds to each other, and bypasses the energy storage battery component and / or the photovoltaic power generation component respectively through a controllable switch; the system control component compares the total grid-connected power demand received at a preset time with the sum of the maximum output power values ​​of the plurality of photovoltaic power generation components, and controls each photovoltaic power generation component and the corresponding energy storage battery component to output the corresponding power to the distribution network through each circuit management component according to a preset strategy based on the comparison result.

[0047] Optionally, each distributed photovoltaic power generation component may include one photovoltaic panel or photovoltaic panels connected in series; each energy storage battery component may include one energy storage battery or multiple energy storage batteries connected in series.

[0048] By setting a storage battery assembly at each distributed photovoltaic power generation assembly, the electric energy stored in the storage battery assembly can compensate for the difference in power generation caused by environmental influences (such as light blocking) or individual differences (such as different service life) of the corresponding photovoltaic panels. By adjusting the charge and discharge state or bypass state of each storage battery assembly, the output power of each photovoltaic power generation assembly can be adjusted, the output power adjustment accuracy of the energy system can be improved, the energy system can meet the changes in the power demand of the distribution network, and overcome the output power fluctuation problem of a single photovoltaic power generation assembly during use due to environmental or individual influences.

[0049] Specifically, the circuit management component includes: an MPPT unit, a bidirectional DC / DC unit, a first switch unit, and a second switch unit. Figure 1 As shown, the MPPT unit provides a maximum power point tracking algorithm for the photovoltaic power generation component (PV) when it is working. The bidirectional DC / DC unit is a two-port network, and the source and load ends of the bidirectional DC / DC unit can be configured. Among the three ports of the photovoltaic power generation component (PV), the energy storage battery component and the DC / AC grid connection, one port can be confirmed as the source end energy, and the other two ports can be used as the load end, or the bypass function can be enabled. The specific working state can be configured according to the working mode of the system. The first switch unit is connected in parallel with the photovoltaic power generation component, and the second switch unit is connected in parallel with the energy storage battery component. When the energy system needs to bypass a photovoltaic power generation component, the first switch unit in the corresponding circuit management component is turned off; when the energy system needs to bypass an energy storage battery component, the second switch unit in the corresponding circuit management component is turned off.

[0050] When the energy system requires both a photovoltaic power generation component and a corresponding energy storage battery component to output power to the distribution network, the first switch unit and the second switch unit are opened at the same time, so that the photovoltaic power generation component and the energy storage battery component output power at the same time. When the energy system only requires the photovoltaic power generation component to output power, the first switch unit is opened and the second switch unit is closed at the same time, so that the energy storage battery component is bypassed. When the energy system only requires the energy storage battery component to output power, the second switch unit is opened and the first switch unit is closed at the same time, so that the photovoltaic power generation component is bypassed. When there is no need to output power to the distribution network, if the energy storage battery component is not fully charged, the photovoltaic power generation component is controlled to charge the energy storage battery component by opening the first switch unit and the second switch unit.

[0051] As mentioned above, there are several working modes for the photovoltaic and storage integrated distributed energy system, as follows: First, the PV grid-connected mode, in which the photovoltaic system is the power source for grid connection, and the energy storage battery assembly does not work through bypass. Second, the energy storage battery assembly grid-connected mode, in which the energy storage battery assembly is the power source for grid connection, and the photovoltaic power generation assembly is isolated and does not work; this mode is mainly used when the photovoltaic system cannot output power to the outside, such as at night, on cloudy days, etc. Third, the PV charging mode for the energy storage battery assembly, in which the photovoltaic power generation assembly is used as a power source to charge the energy storage battery assembly, and the entire energy system is in an offline operation mode; this mode is mainly used when the power grid does not need the energy of the photovoltaic power generation assembly, and the energy storage battery assembly is not fully charged. Fourth, the PV grid-connected mode + energy storage battery assembly charging mode, in which the photovoltaic power generation assembly participates in grid connection and charging the energy storage battery assembly as a power source at the same time, which is mainly used when the power grid needs a certain amount of distributed energy supply, but the energy provided by the photovoltaic system exceeds its demand, and the energy storage system is not fully charged. The fifth is the grid charging the energy storage battery module mode, the grid is used as the energy source; in this mode, as long as the energy used for the grid exceeds the load demand, the photovoltaic system is isolated and does not work, and the energy storage system is not fully charged. The sixth is the PV and energy storage battery module grid-connected mode, the energy storage battery module compensates for the insufficient PV output power, and the two can achieve a constant output power output to the grid.

[0052] Accordingly, please refer to Figure 2 The second aspect of the embodiment of the present invention provides a control method for a photovoltaic-storage integrated distributed energy system with controllable power output. The photovoltaic-storage integrated distributed energy system includes: a plurality of photovoltaic power generation components and one-to-one corresponding energy storage battery components arranged in a dispersed manner. The control method includes the following steps:

[0053] Step S100, receiving the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at a preset time, and obtaining the maximum power value that each photovoltaic power generation component can output at the preset time.

[0054] Step S200: comparing the sum of the maximum power values ​​of a plurality of photovoltaic power generation components with the total grid-connected power demand.

[0055] Step S300, when the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is less than the total grid-connected power demand, the plurality of photovoltaic power generation components and the plurality of energy storage battery components are controlled to perform grid-connected power generation according to a first preset power allocation rule.

[0056] Step S400: when the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is greater than or equal to the total grid-connected power demand, the plurality of photovoltaic power generation components are controlled to perform grid-connected power generation according to a second preset power allocation rule.

[0057] The photovoltaic power generation components of the above-mentioned photovoltaic-storage integrated distributed energy system can be dispersedly arranged, and energy storage battery components can be arranged one by one; or multiple photovoltaic power generation components can be selected and placed together or in a close position, and an energy storage battery component can be arranged correspondingly to connect with the above-mentioned multiple photovoltaic power generation components. As long as the purpose of dispersed arrangement of energy storage battery components is achieved, it is not required that the photovoltaic power generation components are also dispersed.

[0058] Furthermore, the step S300 of controlling a plurality of photovoltaic power generation components and a plurality of energy storage battery components to generate power in grid connection according to a first preset power allocation rule includes:

[0059] Step S310, obtaining the remaining power of each energy storage battery assembly at a preset time.

[0060] Step S320, based on the remaining power of each energy storage battery assembly, determine the output power of each energy storage battery assembly at a preset time.

[0061] Among them, the output power of the energy storage battery assembly is proportional to its remaining power.

[0062] When the total grid-connected power demand is greater than the maximum output power value of all photovoltaic power generation components, that is:

[0063]

[0064] The energy system requires photovoltaic power generation components and energy storage battery components to jointly provide power to the grid.

[0065] The power that each energy storage battery module needs to output is proportional to its own remaining power, that is:

[0066]

[0067] Specifically, the first preset power allocation rule is:

[0068]

[0069] Where P(t) is the total grid-connected power demand of the photovoltaic and energy storage integrated distributed energy system at the preset time t, is the maximum power value of the i-th photovoltaic power generation component at the preset time t, N is the number of photovoltaic power generation components in the photovoltaic storage integrated distributed energy system, 1≤i≤N, is the output power value of the ith photovoltaic power generation component at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th energy storage battery assembly at the preset time t, is the remaining power of the i-th energy storage battery assembly at the preset time t, is the power flow coefficient of the i-th energy storage battery assembly at the preset time t.

[0070] Connection status coefficient Indicates the connection status between the photovoltaic power generation component and the energy system. When , it indicates that the photovoltaic power generation component is connected in series in the energy system; when When , it indicates that the photovoltaic power generation component has been bypassed.

[0071] Correspondingly, the i-th energy storage battery component The value of can be positive or negative. When it is positive, it indicates that the energy storage battery assembly is in a discharging state and its output power is low; when it is negative, it indicates that the energy storage battery assembly is in a charging state and its input power is low.

[0072] Power flow coefficient Specifically:

[0073]

[0074] Specifically, in the first preset power allocation rule, the priority of the output power of the photovoltaic power generation component is higher than the priority of the output power of the energy storage battery component; further, in the first preset power allocation rule, the priority of the output power of the energy storage battery component with high remaining power is higher than the priority of the output power of the energy storage battery component with low remaining power.

[0075] When the total grid-connected power demand value is less than or equal to the sum of the maximum output power values ​​of all photovoltaic power generation components, it is necessary to adjust the operating state of the photovoltaic power generation components to bypass them or operate at the maximum power output load.

[0076] Specifically, controlling a plurality of photovoltaic power generation components to perform grid-connected power generation according to a second preset power allocation rule includes:

[0077] Step S410, obtaining the maximum power values ​​of a plurality of photovoltaic power generation components, and sorting the plurality of maximum power values ​​in descending order, the specific formula is as follows:

[0078]

[0079] Among them, k i The serial numbers of photovoltaic power generation components are renumbered according to the sorting.

[0080] Step S420, selecting a number of photovoltaic power generation components whose maximum power values ​​are greater than the power threshold according to the ranking for grid-connected power generation.

[0081] First, a power threshold P is selected. th and power threshold resolution ΔP th . Power threshold P thThe smaller the value, the smaller the number of algorithm iterations. th The larger it is, the lower the algorithm accuracy. Resolution ΔP th The smaller it is, the higher the algorithm accuracy is, but the number of iterations is also correspondingly greater.

[0082]

[0083] Assume that there exists k a+1 ≤N; so that for

[0084]

[0085] If satisfied:

[0086]

[0087] Then stop and jump to step 430, otherwise proceed to:

[0088] P th =P th +ΔP th .

[0089] Then, repeat the above process.

[0090] Step S430, controlling a plurality of photovoltaic power generation components that are not connected to the grid to be bypassed, and charging the corresponding energy storage battery components respectively.

[0091] Specifically, the second preset power allocation rule is:

[0092]

[0093] Where P(t) is the total grid-connected power demand of the photovoltaic and energy storage integrated distributed energy system at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th photovoltaic power generation component at the preset time t.

[0094] Among them, several photovoltaic power generation components whose sum of maximum output power values ​​is greater than the minimum total grid-connected power demand are selected, and their connection state coefficients are set to 1, and the connection state coefficients of the remaining photovoltaic power generation components are set to 0.

[0095] Further, after selecting a plurality of photovoltaic power generation components having maximum power values ​​greater than the power threshold according to the ranking for grid-connected power generation in step S420, the method further includes:

[0096] The power generated by the photovoltaic power generation component that exceeds the grid-connected power demand is used to charge the corresponding energy storage battery component.

[0097] In the above case, the photovoltaic panels that provide the total grid-connected power of the grid-connected energy will preferentially come from the photovoltaic panels with the highest output power. The output power of the system will not be limited by the photovoltaic panels with the lowest output power. It is also possible to select a small number of photovoltaic power generation components to provide energy during the implementation process and try to maintain the maximum power output of MPPT.

[0098] In addition, the bypassed photovoltaic power generation components can simultaneously charge their corresponding energy storage battery components until they are fully charged.

[0099] The first a photovoltaic panels with the largest power output are selected as photovoltaic outputs, and the a+1 to N panels are bypassed. The power of the first a panels that exceeds the grid-connected power demand is used to charge the battery. The charging power of the battery is related to the SOC of each battery. The smaller the SOC, the greater the charging power. When the SOC is equal to 1, the charging power is zero;

[0100] Charging power:

[0101] P c (t) = P r (t)-P(t);

[0102] Calculate the charging power of each battery:

[0103]

[0104] For the bypassed photovoltaic panel, it needs to charge the battery with a charging power equal to the maximum output power of the photovoltaic panel until the battery is fully charged. After it is fully charged, the output power is 0, that is:

[0105]

[0106] Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned control method for controlling a photovoltaic-storage integrated distributed energy system with controllable power output.

[0107] Accordingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned control method for a photovoltaic-storage integrated distributed energy system with controllable power output.

[0108] The embodiment of the present invention aims to protect a photovoltaic-storage integrated distributed energy system with controllable power output and a control method thereof, the energy system comprising: a plurality of photovoltaic power generation components, a plurality of energy storage battery components, a plurality of circuit management components and a system control component; a plurality of photovoltaic power generation components are connected in series and then connected to a distribution network, and are arranged in a distributed manner; the photovoltaic power generation components correspond one to one with the energy storage battery components and are connected in parallel; the circuit management components are electrically connected to the energy storage battery components and the photovoltaic power generation components, respectively, and correspond one to one, and bypass of the energy storage battery components and the photovoltaic power generation components is achieved through controllable switches; the system control component compares the total grid-connected power demand received at a preset time with the sum of the maximum output power values ​​of a plurality of photovoltaic power generation components, and based on the comparison result, controls each photovoltaic power generation component and the corresponding energy storage battery component to output the corresponding power to the distribution network through each circuit management component according to a preset strategy. The above technical scheme has the following effects:

[0109] Through the decentralized installation of photovoltaic power generation components and corresponding energy storage battery components, the safety risk problems existing in the centralized energy storage system are overcome. When the grid-connected power demand changes, the photovoltaic power generation components and the corresponding energy storage battery components cooperate to provide controllable and stable power output, thereby achieving constant grid-connected output power.

[0110] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0111] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 generate 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 flowchart and / or block diagram. 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.

[0112] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0113] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control method for a photovoltaic-storage integrated distributed energy system with controllable power output, characterized in that: The photovoltaic and energy storage integrated distributed energy system with controllable power output includes: a number of photovoltaic power generation components, a number of energy storage battery components, a number of circuit management components and a system control component; The plurality of photovoltaic power generation components are connected in series and then connected to a power distribution network, and are arranged in a distributed manner; The photovoltaic power generation components correspond to the energy storage battery components one by one and are connected in parallel; The circuit management component is electrically connected to the energy storage battery component and the photovoltaic power generation component respectively and corresponds to each other, and the energy storage battery component and the photovoltaic power generation component are bypassed respectively through a controllable switch; The system control component compares the received total grid-connected power demand at the preset time with the sum of the maximum output power values ​​of the plurality of photovoltaic power generation components, and controls each photovoltaic power generation component and the corresponding energy storage battery component to output corresponding power to the distribution network through each circuit management component according to a preset strategy based on the comparison result; The control method comprises the following steps: Receiving the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at a preset time, and obtaining the maximum power value that each photovoltaic power generation component can output at the preset time; Comparing the sum of the maximum power values ​​of the plurality of photovoltaic power generation components with the total grid-connected power demand; When the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is less than the total grid-connected power demand, controlling the plurality of photovoltaic power generation components and the plurality of energy storage battery components to perform grid-connected power generation according to a first preset power allocation rule; When the sum of the maximum power values ​​of the plurality of photovoltaic power generation components is greater than or equal to the total grid-connected power demand, controlling the plurality of photovoltaic power generation components to perform grid-connected power generation according to a second preset power allocation rule; Controlling the plurality of photovoltaic power generation components and the plurality of energy storage battery components to generate power in grid connection according to a first preset power allocation rule, comprising: Obtaining the remaining power of each of the energy storage battery components at the preset time; Determine the output power of each energy storage battery assembly at the preset time based on the remaining power of each energy storage battery assembly; Wherein, the output power of the energy storage battery assembly is proportional to its remaining power; The first preset power allocation rule is specifically: Wherein, P(t) is the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at the preset time t, is the maximum power value of the i-th photovoltaic power generation component at the preset time t, N is the number of photovoltaic power generation components in the photovoltaic storage integrated distributed energy system, 1≤i≤N, is the output power value of the ith photovoltaic power generation component at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th energy storage battery assembly at the preset time t, is the remaining power of the i-th energy storage battery assembly at the preset time t, is the power flow coefficient of the i-th energy storage battery assembly at the preset time t; The controlling the plurality of photovoltaic power generation components to perform grid-connected power generation according to a second preset power allocation rule comprises: Acquire the maximum power values ​​of the plurality of photovoltaic power generation components, and sort the plurality of maximum power values ​​in descending order; Selecting a number of photovoltaic power generation components whose maximum power values ​​are greater than a power threshold according to the ranking to perform grid-connected power generation; Controlling the bypass of several photovoltaic power generation assemblies that are not connected to the grid for power generation, and charging the corresponding energy storage battery assemblies respectively; The second preset power allocation rule is specifically: Wherein, P(t) is the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at the preset time t, is the connection state coefficient of the ith photovoltaic power generation component at the preset time t, is the output power value of the i-th photovoltaic power generation component at the preset time t; Selecting a number of photovoltaic power generation assemblies whose sum of maximum output power values ​​is greater than the least total grid-connected power demand value, and setting their connection state coefficients to 1, and setting the connection state coefficients of the remaining photovoltaic power generation assemblies to 0; The first a photovoltaic panels with the largest power output are selected as photovoltaic outputs, and the a+1 to N panels are bypassed. The power of the first a panels that exceeds the grid-connected power demand is used to charge the energy storage battery assembly. The battery charging power is related to the SOC of each battery. The smaller the SOC, the greater the charging power. When the SOC is equal to 1, the charging power is zero. Charging power: P c (t)=P r (t)-P(t); Calculate the charging power of each battery: Among them, P c (t) is the total charging power of a energy storage battery assemblies corresponding to the first a maximum power output photovoltaic panels at the preset time t, P r (t) is the total output power of the previous a maximum power output photovoltaic panels at the preset time t, P(t) is the total grid-connected power demand of the photovoltaic-storage integrated distributed energy system at the preset time t, is the charging power of each of the a energy storage battery assemblies at the preset time t, q is the photovoltaic panel serial number of the previous a maximum power output photovoltaic panels, is the remaining power of each energy storage battery assembly in a energy storage battery assemblies.

2. The control method according to claim 1, characterized in that: In the first preset power allocation rule, the priority of the output power of the photovoltaic power generation component is higher than the priority of the output power of the energy storage battery component.

3. The control method according to claim 2, characterized in that: In the first preset power allocation rule, the priority of the output power of the energy storage battery assembly with a high remaining power is higher than the priority of the output power of the energy storage battery assembly with a low remaining power.

4. The control method according to claim 1, characterized in that: After selecting the plurality of photovoltaic power generation components having the maximum power value greater than the power threshold according to the sorting to perform grid-connected power generation, the method further includes: The power generation power exceeding the grid-connected power demand of the photovoltaic power generation assembly is used to charge the corresponding energy storage battery assembly.

5. An electronic device, characterized in that: include: at least one processor; And a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the control method of the photovoltaic and storage integrated distributed energy system with controllable power output as described in any one of claims 1-4.

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