Control method and device of photovoltaic power generation system, electronic equipment and storage medium

Abstract

The invention provides a control method and device of a photovoltaic power generation system, electronic equipment and a storage medium, and the control method comprises the following steps: obtaining the output power of a photovoltaic panel in a plurality of future preset time periods, generating three conditions Result1, Result2 and Result3, adjusting the output power of an energy storage battery, enabling the Result1, Result2 and Result3 to meet preset requirements, and obtaining the output power of the photovoltaic panel in a plurality of future preset time periods. And setting the power of the energy storage battery in the future preset time period Timet as PES (t). According to the control method, the photovoltaic power generation system can be adjusted, so that relatively high economic benefits are obtained.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a control method, device, electronic equipment and storage medium for a photovoltaic power generation system. Background Art

[0002] With the advancement of technology, photovoltaic power generation systems have gradually been widely used. Photovoltaic power generation systems generally include photovoltaic panels and energy storage batteries. At the same time, the photovoltaic power generation system will also be connected to the power grid and to power-consuming equipment. It can be understood that the electric energy generated by the photovoltaic panels can be provided to power-consuming equipment and energy storage batteries, and can also be sold to the power grid; the electric energy in the energy storage batteries can be provided to power-consuming equipment, and can also be sold to the power grid; electric energy is purchased from the power grid and provided to the power-consuming equipment and energy storage batteries, and selling electricity can generate income, but purchasing electricity requires payment. Therefore, how to adjust the photovoltaic power generation system to obtain higher economic benefits has become a problem that needs to be solved urgently. Summary of the invention

[0003] The object of the present invention is to provide a control method, device, electronic equipment and storage medium for a photovoltaic power generation system.

[0004] In order to achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a control method for a photovoltaic power generation system, wherein the photovoltaic power generation system includes a photovoltaic panel and an energy storage battery; comprising the following steps: obtaining T future preset time periods Time1, Time2, ..., Time T , obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant; adjust P ES (1) P ES (2), ..., P ES(T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t).

[0005] As a further improvement of an embodiment of the present invention, the “obtaining the photovoltaic panel in the future preset time period Time” t The output power is P PV (t)” specifically includes: obtaining all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

[0006] As a further improvement of an embodiment of the present invention, the “adjusting P ES (1) P ES (2), ..., P ES (T) so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes: adjusting P ES (1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

[0007] As a further improvement of an embodiment of the present invention, the “adjusting P ES (1) P ES (2), ..., P ES (T) so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes: adjusting P ES (1) P ES (2), ..., P ES The value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

[0008] The embodiment of the present invention also provides a control device for a photovoltaic power generation system, wherein the photovoltaic power generation system includes a photovoltaic panel and an energy storage battery; and includes the following modules: a model creation module for obtaining T future preset time periods Time1, Time2, ..., Time T, obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant; adjustment module is used to adjust P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t).

[0009] As a further improvement of an embodiment of the present invention, the model creation module is further used to: obtain all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

[0010] As a further improvement of an embodiment of the present invention, the adjustment module is further used to: adjust P ES (1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

[0011] As a further improvement of an embodiment of the present invention, the adjustment module is further used to: adjust P ES (1) P ES (2), ..., P ESThe value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

[0012] An embodiment of the present invention further provides an electronic device, comprising: a memory for storing executable instructions; and a processor for implementing the above-mentioned control method when executing the executable instructions stored in the memory.

[0013] The embodiment of the present invention further provides a storage medium storing executable instructions for causing a processor to execute the above control method.

[0014] Compared with the prior art, the technical effect of the present invention is that: the embodiment of the present invention provides a control method, device, electronic device and storage medium of a photovoltaic power generation system, the control method comprising the following steps: obtaining the output power of the photovoltaic panel in multiple future preset time periods, generating three conditions Result1, Result2 and Result3, adjusting the output power of the energy storage battery so that Result1, Result2 and Result3 all meet the preset requirements, and setting the energy storage battery in the future preset time period Time t The power is set to P ES (t). The control method can adjust the photovoltaic power generation system to obtain higher economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of a control method of a photovoltaic power generation system in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0017] As used herein, terms indicating spatial relative positions such as "upper," "above," "lower," and "below" are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the figure is turned over, units described as being "below" or "beneath" other units or features will be located "above" the other units or features. Thus, the exemplary term "below" may encompass both above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0018] Embodiment 1 of the present invention provides a control method for a photovoltaic power generation system, wherein the photovoltaic power generation system includes a photovoltaic panel and an energy storage battery; Figure 1 As shown, the following steps are included:

[0019] Step 101: Obtain T future preset time periods Time1, Time2, ..., Time T , obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant; here, in actual use, the photovoltaic power generation system needs to be connected to the grid, then P max It can be understood as the actual receiving capacity of the power grid. In practice, T future preset time periods Time1, Time2, ..., Time T The weather information in the image is, for example, whether it is cloudy, whether it is raining, the temperature, etc. Then, based on this weather information, the T future preset time periods Time1, Time2, ..., Time T Weather information in;

[0020] Here, in the photovoltaic power generation system, the energy storage device is used to adjust the output power to reduce power fluctuations. Result1 can be understood as the rate of change of power; for example, when the photovoltaic output drops sharply due to sudden changes in cloud cover, the energy storage device should discharge quickly to compensate for this drop and maintain the stable output of the power grid. In actual applications, if the electricity price is higher during a certain period of time, the planned output may be set higher to take advantage of the high electricity price; the energy storage system should discharge to increase the output at this time, otherwise it should store energy when the electricity price is low, that is, Result2 should be as small as possible. While avoiding power waste during high-capacity periods, energy storage devices are also used to smooth the grid load. This includes ensuring that the total output does not exceed the maximum acceptable capacity of the grid, P max At the same time, the energy storage device is charged during the low demand period and discharged during the peak period to reduce the maximum load. During the high temperature period in summer, when the grid demand increases sharply, the energy storage device reduces the system load by discharging to avoid overload operation; at night or when the demand is low, the energy storage device is charged to balance the grid load.

[0021] Step 102: Adjust P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t). Here, in practice, a simulation model can be created, and then the photovoltaic power generation system can be simulated based on the model. During the simulation process, P ES (1) P ES (2), ..., P ES The value of (T) makes Result1, Result2 and Result3 meet the preset requirements.

[0022] In the inventor's experiments, the following experiments were conducted:

[0023] A photovoltaic power station is located in an area with sufficient sunshine in a certain province, with an installed capacity of 50MW and an annual power generation of about 70GWh. The photovoltaic power generation fluctuates greatly due to the weather, so a 10MWh energy storage system is introduced to optimize the control.

[0024] Data and parameters

[0025] Photovoltaic output power P PV (t), energy storage system power P ES (t), planned output P plan (t), the maximum receiving capacity of the power grid P max =55MW, time step t is 1 hour T=8760 hours (all year round).

[0026] Application steps

[0027] Result1 is used to smooth out the fluctuation of photovoltaic power. Data: On a certain day, the photovoltaic output power reaches a peak of 50MW on a sunny day and drops to 20MW on a cloudy day. Operation: The energy storage system charges on sunny days with a charging power of 10MW, and discharges on cloudy days with a discharging power of 10MW to compensate for the power drop.

[0028] Result2 is used to track the planned output. Data: The grid operator sets the planned output for a certain day to be 45MW. Operation: The energy storage system discharges at peak electricity price periods (such as 2pm to 5pm) with a discharge power of 5MW to ensure a total output of 45MW. During low electricity price periods (such as at night), the energy storage system is charged.

[0029] Result 3 is used to reduce abandoned solar power and load-shift. Data: During the high temperature period in summer, the peak demand of the power grid reaches 60MW, which exceeds the maximum acceptance capacity of the power grid. Operation: The energy storage system discharges at the peak demand with a discharge power of 10MW, and charges at the low demand period (such as early morning) with a charging power of 10MW.

[0030] Through the above operations, it can: Smooth fluctuations: effectively reduce the fluctuations of photovoltaic power generation, and the output power change rate is reduced from the original 30MW to within 10MW. Planned output: achieve accurate tracking of planned output, and the deviation is reduced from the original 5MW to within 1MW. Peak shaving: reduce the grid load by 10MW during high demand periods, store excess electricity during low demand periods, and achieve supply and demand balance.

[0031] In the embodiment of the present invention, the “obtaining the photovoltaic panel in the future preset time period Time t The output power is P PV (t)” specifically includes:

[0032] Get all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

[0033] In the embodiment of the present invention, the “adjusting P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes:

[0034] Adjust P ES(1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

[0035] In the embodiment of the present invention, the “adjustment of P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes:

[0036] Adjust P ES (1) P ES (2), ..., P ES The value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

[0037] Embodiment 2 of the present invention provides a control device for a photovoltaic power generation system, wherein the photovoltaic power generation system includes a photovoltaic panel and an energy storage battery; and includes the following modules:

[0038] Model creation module, used to obtain T future preset time periods Time1, Time2, ..., Time T , obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant;

[0039] Adjustment module, used to adjust P ES (1) P ES (2), ..., P ES(T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t).

[0040] In this embodiment, the model creation module is also used to: obtain all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

[0041] In this embodiment, the adjustment module is also used to: adjust P ES (1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

[0042] In this embodiment, the adjustment module is also used to: adjust P ES (1) P ES (2), ..., P ES The value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

[0043] A third embodiment of the present invention provides an electronic device, comprising: a memory for storing executable instructions; and a processor for implementing the control method in the first embodiment when executing the executable instructions stored in the memory.

[0044] Embodiment 4 of the present invention provides a storage medium storing executable instructions for causing a processor to execute and implement the control method in embodiment 1.

[0045] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0046] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for a photovoltaic power generation system, wherein the photovoltaic power generation system comprises a photovoltaic panel and an energy storage battery; characterized in that: The following steps are involved: Get T future preset time periods Time1, Time2, ..., Time T , obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant; Adjust P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t).

2. The control method according to claim 1, characterized in that: The "obtaining the photovoltaic panel in the future preset time period Time t The output power is P PV (t)” specifically includes: Get all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

3. The control method according to claim 1, characterized in that: The "adjustment P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes: Adjust P ES (1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

4. The control method according to claim 1, characterized in that: The "adjustment P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements” specifically includes: Adjust P ES (1) P ES (2), ..., P ES The value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

5. A control device for a photovoltaic power generation system, the photovoltaic power generation system comprising a photovoltaic panel and an energy storage battery; characterized in that: Includes the following modules: Model creation module, used to obtain T future preset time periods Time1, Time2, ..., Time T , obtain the photovoltaic panel in the future preset time period Time t The output power is P PV (t), t and T are both natural numbers, 1≤t≤T; Among them, P ES (t) is the energy storage battery in the future preset time period Time t The power, when P ES (t)>0, it means that the energy storage battery is in a discharging state. ES (t)<0, indicating that the energy storage battery is in a charging state; Among them, P plan (t) is the photovoltaic power generation system in the future preset time period Time t 's planned contribution; Among them, P max is a constant; Adjustment module, used to adjust P ES (1) P ES (2), ..., P ES (T) value, so that Result1, Result2 and Result3 all meet the preset requirements, the energy storage battery will be in the future preset time period Time t The power is set to P ES (t).

6. The control device according to claim 5, characterized in that: The model creation module is also used to: Get all future preset time periods Time1, Time2, ..., Time T Based on all weather information, the photovoltaic panel is obtained in the future preset time period Time t The output power is P PV (t).

7. The control device according to claim 5, characterized in that: The adjustment module is also used for: Adjust P ES (1) P ES (2), ..., P ES (T) such that Result1≤first preset value, Result2≤second preset value and Result3≤third preset value, wherein 0<first preset value<second preset value<third preset value.

8. The control device according to claim 5, characterized in that: The adjustment module is also used for: Adjust P ES (1) P ES (2), ..., P ES The value of (T) makes Result1 the minimum, Result2≤the fourth preset value and Result3≤the fifth preset value, wherein 0<the fourth preset value and 0<the fifth preset value.

9. An electronic device, characterized in that: include: A memory for storing executable instructions; A processor, configured to implement the control method according to any one of claims 1 to 4 when executing the executable instructions stored in the memory.

10. A storage medium, characterized in that: Executable instructions are stored, which are used to cause the processor to execute and implement the control method described in any one of claims 1 to 4.

Images