A method and system for planning power grid expansion taking into account the flexible adjustment capability of the system

Abstract

The present application provides a method and system for planning a power grid expansion that takes into account the flexible adjustment capability of the system. The method includes: obtaining historical weather information and historical power generation and establishing a photovoltaic power generation model; obtaining future weather information of a target date; screening out the historical weather information and corresponding historical power generation that are closest to the future weather information in the photovoltaic power generation model, and recording the first power generation; judging whether the first power generation meets the planned power supply of the first region on the target date; if so, controlling the photovoltaic components and energy storage components to supply power to the first region and sending a first signal; if not, controlling the photovoltaic components to supply power to the energy storage components and the first region and sending a second signal; periodically adjusting the photovoltaic power generation park according to the first signal and the second signal. The technical problem solved by the present application is that the existing power grid expansion planning method has insufficient adjustment capability for photovoltaic power supply and cannot effectively cope with power generation fluctuations caused by weather changes.

Description

Technical Field

[0001] The present invention relates to the field of power grid technology, and in particular to a power grid expansion planning method and system taking into account the flexible adjustment capability of the system. Background Art

[0002] In the current energy transition, grid expansion planning faces unprecedented challenges and opportunities. With the large-scale integration of renewable energy sources such as wind, ocean, and solar, the uncertainty and volatility of their supply are making grid operation and management increasingly complex. Furthermore, with the continuous growth in electricity demand, the capacity and transmission capabilities of the grid need to be expanded and modernized accordingly. Consequently, various grid expansion planning methods have emerged.

[0003] However, there is at least one of the following problems in the related art: the existing grid expansion planning method has insufficient regulation capabilities for photovoltaic power supply and cannot effectively cope with power generation fluctuations caused by weather changes. Summary of the Invention

[0004] The technical problem solved by the present invention is that the existing grid expansion planning method is insufficient in regulating photovoltaic power supply and cannot effectively cope with power generation fluctuations caused by weather changes.

[0005] To solve the above problems, the present invention provides a grid expansion planning method that takes into account the flexible adjustment capability of the system. The grid expansion planning method is applied to a photovoltaic power generation park. The photovoltaic power generation park is provided with photovoltaic components and energy storage components. The photovoltaic power generation park is used to supply power to a first area. The grid expansion planning method includes: obtaining historical weather information of all historical dates and historical power generation of photovoltaic components on historical dates; establishing a photovoltaic power generation model based on the historical weather information and historical power generation; obtaining future weather information of a target date; screening out the historical weather information closest to the future weather information in the photovoltaic power generation model, and obtaining the corresponding historical power generation, recorded as a first power generation; judging whether the first power generation meets the planned power supply of the first area on the target date; if not, controlling the photovoltaic components and the energy storage components to supply power to the first area, and sending a first signal to a conventional power generation park; if so, controlling the photovoltaic components to supply power to the energy storage components and the first area, and sending a second signal to the conventional power generation park; and periodically adjusting the photovoltaic power generation park based on the first signal and the second signal.

[0006] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: by comparing future weather information with historical weather information, the closest historical weather information and its corresponding historical power generation are determined as a reference, ensuring that the photovoltaic power generation park can meet the proposed power supply requirements on the target date. Even if it is not met, it can control the photovoltaic components and energy storage components to supply power to the first area, and send a first signal to the conventional power generation park to request power support; it can also periodically adjust the working status of the photovoltaic power generation park according to the received first signal and second signal, thereby improving the flexibility and stability of the entire power supply system.

[0007] In one example of the present invention, historical weather information includes historical light irradiance, historical temperature data and historical transmittance, and future weather information includes predicted light irradiance range, predicted temperature data range and predicted transmittance range; historical weather information closest to the future weather information in the photovoltaic power generation model is screened out, including: all historical weather information in the photovoltaic power generation model whose historical light irradiance falls within the predicted light irradiance range, historical temperature data falls within the predicted temperature data range, and historical transmittance falls within the predicted transmittance range, recorded as the first data group; according to the historical date, the historical weather information in the first data group whose historical date is closest to the target date is screened out.

[0008] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: historical weather information is screened by light radiation, temperature data, and transmittance, and historical weather information of the historical date closest to the target date is screened, thereby improving the accuracy of the photovoltaic power generation model and the accuracy of the prediction, thereby obtaining a more accurate first power generation and providing more accurate data support for the scheduling and planning of the power grid.

[0009] In one example of the present invention, the photovoltaic assembly includes multiple photovoltaic modules, which are used for photovoltaic power generation; the energy storage assembly includes multiple energy storage modules, which are used for storing electrical energy; the photovoltaic assembly is periodically adjusted according to the first signal and the second signal, including: judging whether the deviation number between the response number of the first signal and the response number of the second signal is greater than the preset deviation number; if it is determined that the deviation number between the response number of the first signal and the response number of the second signal is greater than the preset deviation number, judging whether the response number of the first signal is greater than the response number of the second signal; if so, increasing the number of photovoltaic modules and / or reducing the planned power supply; if not, increasing the number of energy storage modules and / or increasing the planned power supply.

[0010] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: when the first signal and the second signal are received, the system will judge the current energy supply and demand situation by comparing the number of responses of the two; if the deviation between the number of responses of the first signal and the number of responses of the second signal exceeds the preset deviation number, the system will further judge: if the number of responses of the first signal is more than the number of responses of the second signal, it means that the solar energy supply is insufficient, and the system will adjust by increasing the number of photovoltaic modules in the photovoltaic assembly or reducing the planned power supply to balance the energy supply and demand; conversely, if the number of responses of the first signal is less than the number of responses of the second signal, it means that the solar energy supply is in excess, and the system will adjust by increasing the number of energy storage modules or increasing the planned power supply to meet the energy demand; this adjustment mechanism can effectively ensure that the energy supply and demand of the photovoltaic system maintain a dynamic balance, thereby improving energy utilization efficiency and stable operation of the system.

[0011] In one example of the present invention, after sending a first signal to a conventional power generation park, the grid expansion planning method further includes: determining whether the storage capacity of the energy storage component is lower than a first safety threshold; if it is determined that the storage capacity is lower than the first safety threshold, controlling the energy storage component to stop supplying power to the first area, and simultaneously sending a third signal to the conventional power generation park; after receiving the third signal, the conventional power generation park increases the power supply to the first area.

[0012] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: the power supply to the first area is increased through the conventional power generation park, thereby avoiding power outages in the first area caused by insufficient power supply; at the same time, by setting the first safety threshold, the energy storage components can be prevented from being damaged and their lifespan shortened due to being in a state of no power or low power for a long time.

[0013] In one example of the present invention, after sending the second signal to the conventional power generation park, the grid expansion planning method further includes: determining whether the power storage amount is higher than a second safety threshold; if it is determined that the power storage amount is higher than the second safety threshold, controlling the photovoltaic component to stop supplying power to the energy storage component, and simultaneously sending a fourth signal to the conventional power generation park; after receiving the fourth signal, the conventional power generation park reduces the power supply to the first area; wherein the second safety threshold is higher than the first safety threshold.

[0014] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the power supply to the first area is reduced through conventional power generation parks, thereby avoiding the increase in the power abandonment rate caused by excessive power supply; at the same time, by setting the second safety threshold, it can prevent the energy storage components from being in a high power state for a long time, causing the loss and consumption of power in the energy storage components, thereby reducing the risk of damage to the energy storage components.

[0015] In one example of the present invention, after periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method further includes: periodically obtaining the number of responses to the third signal and the number of responses to the fourth signal received by the conventional power generation park; if the number of responses to the third signal is greater than the first preset number, increasing the number of energy storage modules or repairing the energy storage modules; and / or if the number of responses to the fourth signal is greater than the first preset number, increasing the number of energy storage modules or repairing the energy storage modules.

[0016] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: by combining the number of responses to the third signal and the number of responses to the fourth signal received by a conventional power generation park, the working status and needs of the energy storage component can be judged in a timely manner, and then by increasing the number of energy storage modules or repairing the energy storage modules, the response capability and stability of the energy storage component can be effectively improved, thereby ensuring the safety and reliability of the power supply.

[0017] In one example of the present invention, after periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method also includes: obtaining the actual power generation and actual weather information on the target date; calculating the difference between the actual power generation and the first power generation, recorded as the first difference; judging whether the first difference is greater than a preset deviation value; if so, correcting the data in the photovoltaic power generation model; if not, importing the actual weather information and actual power generation into the photovoltaic power generation model.

[0018] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: by obtaining the actual power generation and comparing it with the historical power generation, the photovoltaic power generation model is corrected, the accuracy and reliability of the photovoltaic power generation model prediction are improved, and it is ensured that the photovoltaic power generation model is always predicted based on the latest data, thereby improving the accuracy of power grid planning and operation.

[0019] In one example of the present invention, when the first difference is greater than the preset deviation value, it is determined whether the actual power generation is greater than the first power generation; if so, the closest historical weather information and the corresponding historical power generation are determined to be failure information, and the first processing scheme is executed; wherein, the first processing scheme includes: removing the failure information from the photovoltaic power generation model, and importing the future weather information and actual power generation of the target date into the photovoltaic power generation model; if not, it is determined that there is an abnormality in the photovoltaic component, and the second processing scheme is executed; wherein, the second processing scheme includes: inspecting and repairing each photovoltaic module in the photovoltaic component.

[0020] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: when the deviation value is greater than the preset deviation value, the data in the photovoltaic power generation model is corrected or the photovoltaic components are repaired, thereby improving the stability of the power grid and the reliability of photovoltaic power generation.

[0021] In one embodiment of the present invention, each photovoltaic module in a photovoltaic assembly is inspected and repaired, including: detecting whether the photovoltaic module is aged and / or damaged; if so, replacing the photovoltaic module; or detecting whether the photovoltaic module is blocked; if so, cleaning the photovoltaic module.

[0022] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: by detecting the aging, damage and obstruction of photovoltaic modules and performing corresponding replacement and cleaning, the efficiency of photovoltaic power generation and the service life of photovoltaic components are improved, ensuring that the photovoltaic components are in the best possible condition.

[0023] On the other hand, the present invention also provides a power grid expansion planning system that takes into account the flexible adjustment capability of the system, which is used to implement any of the power grid expansion planning methods described above. The power grid planning system includes: a data module, which is used to obtain historical weather information of all historical dates and historical power generation of photovoltaic components on historical dates, and establish a photovoltaic power generation model based on the historical weather information and historical power generation; a detection module, which is used to obtain future weather information of the target date; a screening module, which is used to screen out historical weather information in the photovoltaic power generation model that is closest to the future weather information, and obtain the corresponding historical power generation, recorded as a first power generation; a judgment module, which is used to judge whether the first power generation meets the planned power supply of the first region on the target date; an execution module, which is used to control the photovoltaic component to supply power to the energy storage component and the first region, and send a first signal to a conventional power generation park; the execution module is also used to control the photovoltaic component to supply power to the energy storage component and the first region, and send a second signal to the conventional power generation park; the execution module is also used to periodically adjust the photovoltaic power generation park based on the first signal and the second signal.

[0024] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: it can achieve the technical effect corresponding to any of the above examples, which will not be repeated here.

[0025] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0026] (1) By comparing future weather information with historical weather information, the closest historical weather information and its corresponding historical power generation are determined as a reference to ensure that the photovoltaic power generation park can meet the proposed power supply requirements on the target date. Even if it cannot meet the requirements, the photovoltaic components and energy storage components can be controlled to supply power to the first area, and a first signal can be sent to the conventional power generation park to request power support. The working state of the photovoltaic power generation park can also be periodically adjusted according to the received first and second signals to improve the flexibility and stability of the entire power supply system.

[0027] (2) Increasing the power supply to the first region through the conventional power generation park, thereby avoiding power outages in the first region due to insufficient power supply; at the same time, by setting the first safety threshold, it is possible to prevent the energy storage components from being damaged or having their life shortened due to being in a state of no power or low power for a long time;

[0028] (3) By combining the number of responses to the third signal and the number of responses to the fourth signal received by the conventional power generation park, the working status and demand of the energy storage component can be judged in a timely manner, and then by increasing the number of energy storage modules or repairing the energy storage modules, the response capability and stability of the energy storage component can be effectively improved to ensure the safety and reliability of the power supply;

[0029] (4) When the first signal and the second signal are received, the system will judge the current energy supply and demand situation by comparing the number of responses of the two signals; if the deviation between the number of responses of the first signal and the number of responses of the second signal exceeds the preset deviation number, the system will further judge: if the number of responses of the first signal is greater than the number of responses of the second signal, it means that the solar energy supply is insufficient, and the system will adjust by increasing the number of photovoltaic modules in the photovoltaic assembly or reducing the planned power supply to balance the energy supply and demand; conversely, if the number of responses of the first signal is less than the number of responses of the second signal, it means that the solar energy supply is excessive, and the system will adjust by increasing the number of energy storage modules or increasing the planned power supply to meet the energy demand; this adjustment mechanism can effectively ensure that the energy supply and demand of the photovoltaic system maintain a dynamic balance, thereby improving energy utilization efficiency and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings to be used in describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0031] Figure 1 A flowchart of a method for planning power grid expansion that takes into account the flexible adjustment capability of the system, provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of module connections of a power grid expansion planning system taking into account the flexible adjustment capability of the system provided by an embodiment of the present invention;

[0033] Description of reference numerals:

[0034] 100. Power grid expansion planning system; 10. Data module; 20. Detection module; 30. Screening module; 40. Judgment module; 50. Execution module. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 , which is a flow chart of a grid expansion planning method that takes into account the flexible adjustment capability of the system, provided by an embodiment of the present invention. The grid expansion planning method is applied to a photovoltaic power generation park, which is equipped with photovoltaic modules and energy storage modules and is used to supply power to a first region. The grid expansion planning method includes:

[0037] Step S1, obtaining historical weather information of all historical dates and historical power generation of photovoltaic modules on the historical dates.

[0038] Step S2: establishing a photovoltaic power generation model based on historical weather information and historical power generation.

[0039] Step S3: Obtain future weather information for the target date.

[0040] Step S4: Filter out historical weather information that is closest to future weather information in the photovoltaic power generation model, and obtain the corresponding historical power generation, which is recorded as the first power generation.

[0041] Step S5 , determining whether the first power generation capacity satisfies the planned power supply capacity of the first region on the target date.

[0042] Step S61: If it is determined that the planned power supply amount for the first region on the target date is met, the photovoltaic components and the energy storage components are controlled to supply power to the first region, and a first signal is sent to the conventional power generation park.

[0043] Step S62: If it is determined that the planned power supply amount for the first region on the target date is not met, the photovoltaic assembly is controlled to supply power to the energy storage assembly and the first region, and a second signal is sent to the conventional power generation park.

[0044] Step S7: periodically adjust the photovoltaic power generation park according to the first signal and the second signal.

[0045] Specifically, by comparing future weather information with historical weather information, the closest historical weather information and its corresponding historical power generation are determined as a reference to ensure that the photovoltaic power generation park can meet the proposed power supply requirements on the target date. Even if it is not met, it can supply power to the first area by controlling the photovoltaic components and energy storage components, and send a first signal to the conventional power generation park to request power support; it can also periodically adjust the working status of the photovoltaic power generation park according to the received first signal and second signal, thereby improving the flexibility and stability of the entire power supply system.

[0046] Preferably, historical weather information includes historical light irradiance, historical temperature data and historical transmittance, and future weather information includes predicted light irradiance range, predicted temperature data range and predicted transmittance range; historical weather information closest to future weather information in the photovoltaic power generation model is screened out, including: all historical weather information in the photovoltaic power generation model whose historical light irradiance falls within the predicted light irradiance range, historical temperature data falls within the predicted temperature data range, and historical transmittance falls within the predicted transmittance range, recorded as the first data group; according to the historical date, the historical weather information in the first data group whose historical date is closest to the target date is screened out.

[0047] Specifically, historical weather information is filtered through light radiation, temperature data, and transmittance, and historical weather information of the historical date closest to the target date is filtered, which improves the accuracy of the photovoltaic power generation model and the accuracy of the prediction, thereby obtaining a more accurate first power generation and providing more accurate data support for the scheduling and planning of the power grid.

[0048] Preferably, the photovoltaic assembly includes multiple photovoltaic modules, which are used for photovoltaic power generation; the energy storage assembly includes multiple energy storage modules, which are used for storing electrical energy; the photovoltaic assembly is periodically adjusted according to the first signal and the second signal, including: judging whether the deviation number between the response number of the first signal and the response number of the second signal is greater than the preset deviation number; if it is judged that the deviation number between the response number of the first signal and the response number of the second signal is greater than the preset deviation number, judging whether the response number of the first signal is greater than the response number of the second signal; if so, increasing the number of photovoltaic modules in the photovoltaic assembly and / or reducing the planned power supply; if not, increasing the number of energy storage modules in the energy storage assembly and / or increasing the planned power supply.

[0049] Specifically, the length of the cycle for obtaining the number of responses to the first signal and the number of responses to the second signal can be determined according to actual adjustment requirements, and the preset number of deviations is determined according to the length of the cycle; normally, the length of each cycle is one month, and the preset number of deviations is 10 times. For example, within a cycle, when the deviation between the number of responses to the first signal and the number of responses to the second signal is greater than 10 times, the number of responses to the first signal and the second signal is further determined. If the number of responses to the first signal is greater than the number of responses to the second signal, the number of photovoltaic modules in the photovoltaic assembly is increased and / or the planned power supply is reduced; if the number of responses to the first signal is less than the number of responses to the second signal, the number of energy storage modules in the energy storage assembly is increased and / or the planned power supply is increased.

[0050] Furthermore, after determining that the number of responses to the first signal is greater than the number of responses to the second signal, it is determined whether the photovoltaic power generation park has photovoltaic power generation potential; if so, the number of photovoltaic modules is increased; if not, the planned power supply is reduced.

[0051] Furthermore, after determining that the number of responses to the second signal is greater than the number of responses to the first signal, it is determined whether there is room for increasing the energy storage module; if so, the number of energy storage modules is increased; if not, the planned power supply is increased.

[0052] Specifically, when the first signal and the second signal are received, the system will determine the current energy supply and demand situation by comparing the number of responses to the two; if the deviation between the number of responses to the first signal and the number of responses to the second signal exceeds the preset deviation number, the system will further determine: if the number of responses to the first signal is more than the number of responses to the second signal, it means that the solar energy supply is insufficient, and the system will adjust by increasing the number of photovoltaic modules in the photovoltaic assembly or reducing the planned power supply to balance energy supply and demand; conversely, if the number of responses to the first signal is less than the number of responses to the second signal, it means that the solar energy supply is in excess, and the system will adjust by increasing the number of energy storage modules or increasing the planned power supply to meet energy demand; this adjustment mechanism can effectively ensure that the energy supply and demand of the photovoltaic system remain in a dynamic balance, thereby improving energy utilization efficiency and stable operation of the system.

[0053] Preferably, after sending the first signal to the conventional power generation park, the power grid expansion planning method further includes: determining whether the storage capacity of the energy storage component is lower than a first safety threshold; if it is determined that the storage capacity is lower than the first safety threshold, controlling the energy storage component to stop supplying power to the first area, and simultaneously sending a third signal to the conventional power generation park; after receiving the third signal, the conventional power generation park increases the power supply to the first area.

[0054] Furthermore, the storage capacity of the energy storage component that is higher than the first safety threshold at the beginning of the target date is defined as the first storage capacity, the increased power supply of the conventional power generation park is defined as the first power supply, and the proposed power supply is subtracted from the first storage capacity and the first power generation capacity to obtain the first power supply of the conventional power generation park.

[0055] For example, the proposed power supply is defined as E, the first power generation is defined as E1, the first storage capacity is defined as E2, and the first power supply is defined as E3. Then, the first power supply E3 is calculated as follows:

[0056] E3=E-E1-E2.

[0057] Specifically, the power supply to the first region is increased through conventional power generation parks, thereby avoiding power outages in the first region due to insufficient power supply; at the same time, by setting the first safety threshold, the energy storage components can be prevented from being damaged or having their lifespan shortened due to being in a state of no power or low power for a long time.

[0058] Preferably, after sending the second signal to the conventional power generation park, the grid expansion planning method also includes: determining whether the power storage amount is higher than the second safety threshold; if it is determined that the power storage amount is higher than the second safety threshold, controlling the photovoltaic component to stop supplying power to the energy storage component, and simultaneously sending a fourth signal to the conventional power generation park; after receiving the fourth signal, the conventional power generation park reduces the power supply to the first area; wherein the second safety threshold is higher than the first safety threshold.

[0059] Furthermore, the storage capacity gap between the energy storage component and the second safety threshold at the beginning of the target date is defined as the second storage capacity, the reduced power supply of the conventional power generation park is defined as the second power supply, and the first power generation is subtracted from the second storage capacity and the planned power supply to obtain the second power supply of the conventional power generation park.

[0060] For example, the second power storage capacity is defined as E4, and the second power supply capacity is defined as E5. Then, the second power supply capacity E5 is calculated as follows:

[0061] E5=E1-E-E4.

[0062] Specifically, the amount of power supplied to the first region is reduced through conventional power generation parks, thereby avoiding an increase in the power abandonment rate due to excessive power supply. At the same time, by setting a second safety threshold, the energy storage components can be prevented from being in a high power state for a long time, causing loss and consumption of power in the energy storage components, thereby reducing the risk of damage to the energy storage components.

[0063] Preferably, after periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method further includes: periodically obtaining the number of responses to the third signal and the number of responses to the fourth signal received by the conventional power generation park; if the number of responses to the third signal is greater than the first preset number, increasing the number of energy storage modules or repairing the energy storage modules; and / or if the number of responses to the fourth signal is greater than the first preset number, increasing the number of energy storage modules or repairing the energy storage modules.

[0064] Preferably, after periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method also includes: obtaining the actual power generation and actual weather information on the target date; if the deviation value between the actual power generation and the first power generation is less than or equal to the preset deviation value, the actual weather information and the actual power generation are imported into the photovoltaic power generation model; if the deviation value is greater than the preset deviation value, the data in the photovoltaic power generation model is corrected.

[0065] Specifically, by obtaining actual power generation and comparing it with historical power generation, the photovoltaic power generation model is corrected, which improves the accuracy and reliability of the photovoltaic power generation model prediction, ensures that the photovoltaic power generation model always makes predictions based on the latest data, and thus improves the accuracy of power grid planning and operation.

[0066] Preferably, when the deviation value is greater than the preset deviation value, if the actual power generation is greater than the first power generation, the closest historical weather information and the corresponding historical power generation are determined to be failure information, the failure information is removed from the photovoltaic power generation model, and the future weather information and actual power generation of the target date are imported into the photovoltaic power generation model; if the actual power generation is less than the historical power generation, it is determined that there is an abnormality in the photovoltaic assembly, and each photovoltaic module in the photovoltaic assembly is repaired.

[0067] Furthermore, the actual power generation is defined as E e , define the deviation value as ΔE, ΔE=|E e -E1|, defines the preset deviation value as E p ; If ΔE<E p , then the actual weather information and actual power generation are imported into the photovoltaic power generation model; if ΔE>E p , and E e > E1, that is, when the future weather information is close to the historical weather, the actual power generation is much greater than the first power generation due to the update of photovoltaic components and the optimization of lines. At this time, the historical power generation cannot make a relatively accurate prediction of the actual power generation, and it is judged as invalid information. The future weather information of the target date and the actual power generation are imported into the photovoltaic power generation model, which improves the accuracy of the photovoltaic power generation model prediction; if ΔE>E p , and E eWhen <E1, that is, when the future weather information is close to the historical weather information, the actual power generation may be much smaller than the first power generation due to damage and aging of the photovoltaic modules in the photovoltaic assembly. By comparing the actual power generation with the first power generation, data support is provided for maintenance, more accurate prediction is made, the efficiency of maintenance is improved, and the stability of the power grid and the reliability of photovoltaic power generation are improved.

[0068] Preferably, each photovoltaic module in the photovoltaic assembly is inspected and repaired, including: detecting whether the photovoltaic module is aged and / or damaged; if aged and / or damaged, replacing the photovoltaic module; or detecting whether the photovoltaic module is blocked; if blocked, cleaning the photovoltaic module; by detecting the aging, damage and blocking of the photovoltaic module and performing corresponding replacement and cleaning, the efficiency of photovoltaic power generation and the service life of the photovoltaic assembly are improved, ensuring that the photovoltaic assembly is in the best possible condition.

[0069] Preferably, combined Figure 2 The present invention also provides a grid expansion planning system 100 that takes into account the flexible adjustment capability of the system, and is used to implement any of the grid expansion planning methods described above. The grid planning system includes: a data module 10, a detection module 20, a screening module 30, a judgment module 40, and an execution module 50. The data module 10 is used to obtain historical weather information and historical power generation of photovoltaic modules on all historical dates, and establish a photovoltaic power generation model based on the historical weather information and historical power generation; the detection module 20 is used to obtain future weather information on a target date; the screening module 30 is used to filter out historical weather information in the photovoltaic power generation model that is closest to the future weather information, and obtain the corresponding historical power generation, which is recorded as a first power generation; the judgment module 40 is used to determine whether the first power generation meets the planned power supply of the first region on the target date; the execution module 50 is used to control the photovoltaic module to supply power to the energy storage module and the first region, and to send a first signal to a conventional power generation park; the execution module 50 is also used to control the photovoltaic module to supply power to the energy storage module and the first region, and to send a second signal to the conventional power generation park; and the execution module 50 is also used to periodically adjust the photovoltaic power generation park based on the first signal and the second signal.

[0070] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A method for planning power grid expansion taking into account the flexible adjustment capability of the system, characterized in that: The grid expansion planning method is applied to a photovoltaic power generation park, wherein the photovoltaic power generation park is provided with a photovoltaic assembly and an energy storage assembly, wherein the photovoltaic assembly includes a plurality of photovoltaic modules, each of which is used for photovoltaic power generation; and the energy storage assembly includes a plurality of energy storage modules, each of which is used for storing electrical energy. The photovoltaic power generation park supplies power to a first region, and the grid expansion planning method includes: Obtain historical weather information of all historical dates and historical power generation of the photovoltaic module on the historical dates; establishing a photovoltaic power generation model based on the historical weather information and the historical power generation; Get future weather information for the target date; Filtering the historical weather information closest to the future weather information in the photovoltaic power generation model, and obtaining the corresponding historical power generation, which is recorded as a first power generation; determining whether the first power generation capacity satisfies the planned power supply capacity of the first region on the target date; If not, controlling the photovoltaic assembly and the energy storage assembly to supply power to the first area, and sending a first signal to a conventional power generation park; If so, controlling the photovoltaic assembly to supply power to the energy storage assembly and the first area, and sending a second signal to the conventional power generation park; periodically adjusting the photovoltaic power generation park according to the first signal and the second signal; The periodically adjusting the photovoltaic power generation park according to the first signal and the second signal includes: Determining whether a deviation between the number of responses to the first signal and the number of responses to the second signal is greater than a preset deviation; If it is determined that the deviation between the number of responses to the first signal and the number of responses to the second signal is greater than the preset deviation, determining whether the number of responses to the first signal is greater than the number of responses to the second signal; If the number of responses to the first signal is greater than the number of responses to the second signal, increasing the number of photovoltaic modules and / or reducing the planned power supply; If the number of responses to the first signal is less than the number of responses to the second signal, increasing the number of energy storage modules and / or increasing the planned power supply; After sending the first signal to the conventional power generation park, the grid expansion planning method further includes: Determining whether the storage capacity of the energy storage component is lower than a first safety threshold; If it is determined that the amount of stored electricity is lower than the first safety threshold, controlling the energy storage component to stop supplying power to the first area, and simultaneously sending a third signal to the conventional power generation park; After receiving the third signal, the conventional power generation park increases the power supply to the first area; After sending the second signal to the conventional power generation park, the grid expansion planning method further includes: Determining whether the power storage capacity is higher than a second safety threshold; If it is determined that the amount of stored electricity is higher than the second safety threshold, controlling the photovoltaic assembly to stop supplying power to the energy storage assembly, and simultaneously sending a fourth signal to the conventional power generation park; After receiving the fourth signal, the conventional power generation park reduces the amount of power supplied to the first area; wherein the second safety threshold is higher than the first safety threshold; After periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method further includes: periodically obtaining the number of responses to the third signal and the number of responses to the fourth signal received by the conventional power generation park; If the number of responses to the third signal is greater than a first preset number, increasing the number of energy storage modules or repairing the energy storage modules; and / or If the number of responses to the fourth signal is greater than the first preset number, increasing the number of the energy storage modules or repairing the energy storage modules; After periodically adjusting the photovoltaic power generation park according to the first signal and the second signal, the grid expansion planning method further includes: Obtaining actual power generation and actual weather information on the target date; Calculating a difference between the actual power generation and the first power generation, and recording the difference as a first difference; Determining whether the first difference is greater than a preset deviation value; If so, the data in the photovoltaic power generation model is corrected; If not, the actual weather information and the actual power generation are imported into the photovoltaic power generation model.

2. The power grid expansion planning method according to claim 1, characterized in that: The historical weather information includes historical light irradiance, historical temperature data and historical transmittance, and the future weather information includes a predicted light irradiance range, a predicted temperature data range and a predicted transmittance range; The step of screening out the historical weather information closest to the future weather information in the photovoltaic power generation model includes: Filtering all the historical weather information in the photovoltaic power generation model, wherein the historical light irradiance falls within the predicted light irradiance range, the historical temperature data falls within the predicted temperature data range, and the historical transmittance falls within the predicted transmittance range, and recording the data as a first data group; The historical weather information whose historical date is closest to the target date in the first data group is filtered out according to the historical date.

3. The power grid expansion planning method according to claim 1, characterized in that: When the first difference is greater than the preset deviation value, determining whether the actual power generation is greater than the first power generation; If so, the closest historical weather information and the corresponding historical power generation are determined to be invalid information, and a first processing solution is executed; wherein the first processing solution includes: removing the invalid information from the photovoltaic power generation model, and importing the future weather information and the actual power generation of the target date into the photovoltaic power generation model; If not, it is determined that the photovoltaic assembly is abnormal, and a second processing solution is executed; wherein the second processing solution includes: inspecting and repairing each photovoltaic module in the photovoltaic assembly.

4. The power grid expansion planning method according to claim 3, characterized in that: The repairing of each photovoltaic module in the photovoltaic assembly includes: Detecting whether the photovoltaic module is aged and / or damaged; If there is aging and / or damage, replace the photovoltaic module; or Detecting whether the photovoltaic module is blocked; If the obstruction situation exists, the photovoltaic module is cleaned.

5. A power grid expansion planning system taking into account the system's flexible adjustment capability, characterized in that: For implementing the power grid expansion planning method according to any one of claims 1 to 4, the power grid expansion planning system comprises: a data module, the data module being configured to obtain the historical weather information of all the historical dates and the historical power generation of the photovoltaic modules on the historical dates, and to establish the photovoltaic power generation model based on the historical weather information and the historical power generation; a detection module, the detection module being configured to obtain the future weather information on the target date; a screening module, the screening module being configured to screen out the historical weather information closest to the future weather information in the photovoltaic power generation model, and obtain the corresponding historical power generation, which is recorded as the first power generation; a determination module, configured to determine whether the first power generation capacity satisfies the planned power supply capacity of the first region on the target date; an execution module, configured to control the photovoltaic assembly to supply power to the energy storage assembly and the first region, and to send the first signal to the conventional power generation park; The execution module is further configured to control the photovoltaic assembly to supply power to the energy storage assembly and the first region, and to send the second signal to the conventional power generation park; The execution module is further configured to periodically adjust the photovoltaic power generation park according to the first signal and the second signal.

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