Photovoltaic power control method and system for transformer

Abstract

The invention provides a photovoltaic power control method and system for a transformer, and belongs to the technical field of power control, and the method specifically comprises the steps: taking the reverse current data of different reverse power transmission users in different current intervals as the basis, and when it is determined that the control processing of the photovoltaic power of the low-voltage side of the transformer does not need to be carried out through a preset strategy; and determining analysis results of the reverse current data of different users in different time periods, determining common reverse sending time periods of different users by using the analysis results, and determining matched users based on matching data of the common reverse sending time periods in the different time periods. The reverse current data of different matching users in the time periods are used for determining power limiting strategies of different time periods, whether photovoltaic power limiting processing needs to be carried out or not is determined based on the monitoring data of the output power of the transformer and the power limiting strategies, and the overload condition of the transformer is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of power control, and in particular relates to a photovoltaic power control method and system for a transformer. Background Art

[0002] The photovoltaic power sources installed on the user side are random and decentralized, which brings great challenges to the power consumption and processing of the power grid. Therefore, how to achieve power control of photovoltaic power sources and improve the operating reliability of transformers while reducing the impact on the operating safety of transformers has become a technical problem that needs to be solved urgently.

[0003] In response to the above technical problems, the present application specifically provides a photovoltaic power control method and system for a transformer. Summary of the invention

[0004] To achieve the purpose of the present invention, the present invention adopts the following technical solutions: According to one aspect of the present invention, a photovoltaic power control method for a transformer is provided.

[0005] A photovoltaic power control method for a transformer, specifically comprising: S1 determines the reverse current data of different users in different time periods based on the monitoring data of the transformer, and determines the reverse power transmission users among the users by using the analysis results of the reverse current data; S2 proceeds to the next step when it is determined that it is not necessary to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer based on the reverse current data of different reverse power transmission users in different current intervals; S3 determines analysis results of reverse current data of different users in different time periods, and uses the analysis results to determine common reverse current time periods of different users; S4 determines matching users based on matching data of common reverse transmission periods in different time periods, determines power limiting strategies for different time periods using reverse current data of different matching users in the time periods, and determines whether photovoltaic power limitation processing is required based on monitoring data of the transformer's output power and the power limiting strategy.

[0006] The beneficial effects of the present invention are: Based on the reverse current data of different reverse power transmission users in different current intervals, it is determined whether it is necessary to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer, thereby realizing the determination of the abnormal degree of reverse power transmission of the transformer from the number of reverse power transmission users and the abnormal conditions of the reverse power transmission data of different reverse power transmission users. At the same time, it also lays the foundation for the strategy of controlling the photovoltaic power on the low-voltage side of the transformer according to the abnormal degree of reverse power transmission of the transformer.

[0007] The power limiting strategies for different time periods are determined by utilizing the reverse current data of different matching users in the time periods, fully considering the abnormal situations of reverse power transmission in different time periods caused by the reverse current data of different matching users in the time periods, and then determining the power limiting strategies for different time periods according to the abnormal situations, thereby avoiding the abnormal situation of power overlimit in the transformer and improving the operating reliability of the transformer.

[0008] A further technical solution is that the reverse current data includes the number of reverse power transmissions, the reverse current amplitudes corresponding to different reverse power transmission numbers, and the durations.

[0009] A further technical solution is that a method for determining the reverse power transmission user among the users is as follows: Determine the number of reverse power transmissions of the user on different dates by using the analysis result of the reverse current data, and determine the cumulative duration of the reverse power transmissions on different dates by the duration of the different reverse power transmissions; The reverse power transmission date of the user is determined by the accumulated duration of different dates, and whether the user is a reverse power transmission user is determined by the number of the reverse power transmission dates.

[0010] A further technical solution is that the reverse power transmission date of the user is a date when the cumulative duration is greater than a preset duration.

[0011] A further technical solution is that when the number of reverse power transmission dates of the user is greater than the number of preset power transmission dates, the user is determined to be a reverse power transmission user.

[0012] A further technical solution is to determine whether photovoltaic power limitation is required, which specifically includes: When the duration of the output power being greater than the preset power limit threshold is greater than the preset time threshold, it is determined that photovoltaic power limitation processing needs to be performed.

[0013] In a second aspect, the present invention provides a computer system comprising: a memory and a processor that are communicatively connected, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the above-mentioned photovoltaic power control method for a transformer when running the computer program.

[0014] Other features and advantages will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0017] Figure 1 is a flow chart of a power control method; Figure 2 is a flow chart of a method for determining a reverse power transmission user among users; Figure 3 The invention is a flow chart for determining that it is not necessary to adopt a preset strategy to control the photovoltaic power on the low voltage side of the transformer. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0019] For ease of understanding, the scheme will be described below through Example 1 and Example 2. Example 1

[0020] To solve the above problems, according to one aspect of the present invention, Figure 1 According to one aspect of the present invention, a photovoltaic power control method for a transformer is provided, which specifically includes: S1 determines the reverse current data of different users in different time periods based on the monitoring data of the transformer, and determines the reverse power transmission users among the users by using the analysis results of the reverse current data; Furthermore, the reverse current data includes the number of reverse power transmissions, the reverse current amplitudes corresponding to different reverse power transmission numbers, and the durations.

[0021] Optionally, if Figure 2 As shown, the method for determining the reverse power transmission users among the users is: Determine the number of reverse power transmissions of the user on different dates by using the analysis result of the reverse current data, and determine the cumulative duration of the reverse power transmissions on different dates by the duration of the different reverse power transmissions; The reverse power transmission date of the user is determined by the accumulated duration of different dates, and whether the user is a reverse power transmission user is determined by the number of the reverse power transmission dates.

[0022] Specifically, the reverse power transmission date of the user is a date when the cumulative duration is greater than the preset duration.

[0023] Optionally, when the number of reverse power transmission dates of the user is greater than the number of preset power transmission dates, the user is determined to be a reverse power transmission user.

[0024] In another embodiment, the method for determining the reverse power transmission user among the users is: S11 determines the number of reverse power transmissions of the user on different dates using the analysis result of the reverse current data, and determines the weight coefficients of different reverse power transmissions using the reverse current amplitudes and durations of different reverse power transmissions; Optionally, the above step S11 includes the following contents: S111 uses the analysis result of the reverse current data to determine the number of reverse power transmissions of the user on different dates. When the sum of the reverse power transmissions of the user on different dates is greater than the preset power transmission number, the user is determined to be a reverse power transmission user. When the sum of the reverse power transmissions of the user on different dates is not greater than the preset power transmission number, the process proceeds to step S112. S112 determines the weight coefficients of different reverse power transmission times by using the reverse current amplitudes and durations of different reverse power transmission times. When the sum of the weight coefficients of different reverse power transmission times of the user does not meet the requirements, the user is determined to be a reverse power transmission user. When the sum of the weight coefficients of different reverse power transmission times of the user meets the requirements, the process proceeds to step S113. S113: When there is a reverse power transmission number with a weight coefficient greater than the preset weight coefficient, the process proceeds to step S114; when there is no reverse power transmission number with a weight coefficient greater than the preset weight coefficient, the process proceeds to step S12; S114 takes the number of reverse power transmissions with a weight coefficient greater than the preset weight coefficient as the screened power transmission number. When the screened power transmission number is greater than the preset screening number threshold, the user is determined to be a reverse power transmission user. When the screened power transmission number is not greater than the preset screening number threshold, proceed to step S12.

[0025] S12: determining the reverse power transmission frequency coefficient of the user on different dates by using the weight coefficients of different reverse power transmission times on different dates, and determining the reverse power transmission date of the user by using the reverse power transmission frequency coefficient; Optionally, the above step S12 includes the following contents: S121 determines the frequency coefficient of reverse power transmission of the user on different dates by weight coefficients of different reverse power transmission times on different dates. When the average value of the frequency coefficient of reverse power transmission of the user on different dates is greater than a preset frequency coefficient threshold, the user is determined to be a reverse power transmission user. When the average value of the frequency coefficient of reverse power transmission of the user on different dates is not greater than the preset frequency coefficient threshold, the process proceeds to step S122. S122: When it is determined by using the reverse power transmission frequency coefficient that the user does not have a reverse power transmission date, it is determined that the user does not belong to the reverse power transmission user; when it is determined by using the reverse power transmission frequency coefficient that the user has a reverse power transmission date, the process proceeds to step S123; S123: When the number of reverse power transmission dates is greater than the preset number of reverse power transmission dates, it is determined that the user is a reverse power transmission user; when the number of reverse power transmission dates is not greater than the preset number of reverse power transmission dates, the process proceeds to step S13.

[0026] S13 obtains the interval lengths between different reverse power transmission dates, and determines the reverse power transmission abnormality coefficient of the user in combination with the reverse power transmission frequency coefficients of different reverse power transmission dates, and uses the reverse power transmission abnormality coefficient to determine whether the user is a reverse power transmission user.

[0027] Furthermore, when the reverse power transmission abnormality coefficient of the user does not meet the requirement, the user is determined to be a reverse power transmission user.

[0028] S2 proceeds to the next step when it is determined that it is not necessary to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer based on the reverse current data of different reverse power transmission users in different current intervals; Specifically, Figure 3 As shown, it is determined that there is no need to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer, specifically including: Based on the reverse current data of different reverse power transmission users in different current intervals, determining the cumulative duration of reverse power transmission by the reverse power transmission users in the preset current interval; According to the accumulated duration of reverse power transmission of different reverse power transmission users in the preset current interval, the sum of the accumulated durations is determined and used as the sum of durations; The duration is used to determine whether a preset strategy needs to be adopted to control the photovoltaic power on the low-voltage side of the transformer.

[0029] Further, when the duration is greater than a preset duration, it is determined that a preset strategy needs to be adopted to control the photovoltaic power on the low-voltage side of the transformer.

[0030] Optionally, the preset strategy is to use a preset output power threshold to control the photovoltaic power on the low-voltage side of the transformer in all time periods.

[0031] Optionally, determining that it is not necessary to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer specifically includes: Acquire the number of the reverse power transmission users, and when the number of the reverse power transmission users is greater than a preset reverse power transmission user number threshold, determine that a preset strategy needs to be adopted to control the photovoltaic power on the low-voltage side of the transformer; When the number of reverse power transmission users is not greater than the preset reverse power transmission user number threshold: Based on the reverse current data of different reverse power transmission users in different current intervals, the cumulative duration of reverse power transmission by the reverse power transmission users in the preset current interval is determined, and when there is no reverse power transmission user that performs reverse power transmission in the preset current interval, it is determined that it is not necessary to adopt the preset strategy to control the photovoltaic power on the low-voltage side of the transformer; When there is a reverse power transmission user that transmits power in the preset current range: According to the accumulated duration of reverse power transmission of different reverse power transmission users in the preset current interval, the sum of the accumulated duration is determined and used as the sum of durations. When the sum of durations is greater than the preset duration, it is determined that a preset strategy needs to be adopted to control the photovoltaic power on the low-voltage side of the transformer; When the sum of the durations is not greater than the preset duration threshold: Determine the frequency coefficient of use of different reverse power transmission users in the preset current interval according to the cumulative duration of reverse power transmission in the preset current interval and the number of reverse power transmissions; when the number of reverse power transmission users whose frequency coefficient is greater than the preset frequency coefficient does not meet the requirement, determine that a preset strategy needs to be adopted to control the photovoltaic power on the low-voltage side of the transformer; When the number of reverse power transmission users with a frequency coefficient greater than the preset frequency coefficient meets the requirement: The frequency coefficient evaluation amount is determined by using the frequency coefficients of different reverse power transmission users in the preset current range, and it is determined according to the frequency coefficient evaluation amount whether a preset strategy needs to be adopted to control the photovoltaic power on the low voltage side of the transformer.

[0032] S3 determines analysis results of reverse current data of different users in different time periods, and uses the analysis results to determine common reverse current time periods of different users; Specifically, the method for determining the common feedback time period of the user is: Determine the number of reverse power transmissions in the target time periods on different dates based on the analysis results of the reverse current data of the user in the target time period; Determine the total number of reverse power transmissions for the user according to the number of reverse power transmissions during target time periods on different dates; Whether the target time period is a common reverse power transmission time period is determined based on the total number of reverse power transmissions of the user.

[0033] Further, when the total number of reverse power transmissions in the target time period is not within a preset number range, the target time period is determined to be a common reverse power transmission period.

[0034] S4 determines matching users based on matching data of common reverse transmission periods in different time periods, determines power limiting strategies for different time periods using reverse current data of different matching users in the time periods, and determines whether photovoltaic power limitation processing is required based on monitoring data of the transformer's output power and the power limiting strategy.

[0035] It should be noted that the matching users are users whose time period is a common feedback period in the time period.

[0036] Specifically, the method for determining the power limitation strategy for the time period is: Determine the cumulative reverse power transmission duration of the matching user in the time period based on the reverse current data of the matching user in the time period; Obtaining the cumulative duration of reverse power transmission of the matched user in the time period, and determining the total of the cumulative duration in combination with the number of the matched users; A power limiting strategy for the time period is determined based on the accumulated time period.

[0037] Further, based on the accumulated duration and determining the power limitation strategy for the time period, specifically includes: Based on the accumulated time sum, a preset power limit threshold corresponding to the accumulated time sum is determined, and a power limit strategy for the time period is determined based on the preset power limit threshold.

[0038] Further, it is determined whether it is necessary to limit the photovoltaic power, including: When the duration of the output power being greater than the preset power limit threshold is greater than the preset time threshold, it is determined that photovoltaic power limitation processing needs to be performed. Example 2

[0039] In a second aspect, the present invention provides a computer system comprising: a memory and a processor that are communicatively connected, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the above-mentioned photovoltaic power control method for a transformer when running the computer program.

[0040] Optionally, the method for determining the power limitation strategy for the time period is: Determine the cumulative reverse power transmission time of the matched user in the time period based on the reverse current data of the matched user in the time period, and when the number of matched users whose cumulative reverse power transmission time is greater than a preset cumulative time threshold is greater than the preset number of matched users, determine the power limitation strategy for the time period using a preset strategy; When the number of matching users whose cumulative reverse power transmission duration is greater than the preset cumulative duration threshold is not greater than the preset number of matching users: Obtaining the cumulative duration of reverse power transmission of the matched user in the time period, and determining the cumulative duration sum in combination with the number of the matched users, and when the cumulative duration sum is greater than a preset duration limit value, determining to adopt a preset strategy to determine the power limitation strategy for the time period; When the cumulative duration is not greater than the preset duration limit: Determine the total reverse power transmission current of the matching users on different dates in the time period based on the reverse power transmission data of the matching users on different dates in the time period, and when the number of dates when the total reverse power transmission current is greater than the preset current threshold is greater than the preset number of dates, determine to adopt the preset strategy to determine the power limitation strategy for the time period; When the number of days when the total reverse power transmission current is greater than the preset current threshold is not greater than the preset number of days: Determine the reverse power transmission abnormality coefficients of different dates according to the total reverse power transmission current of the matching users on different dates in the time period and the number of matching users with reverse power transmission, and when the number of dates with the reverse power transmission abnormality coefficient greater than the preset abnormality coefficient is greater than the preset number of dates, determine to adopt the preset strategy to determine the power limitation strategy for the time period; When the number of days when the reverse power transmission abnormality coefficient is greater than the preset abnormality coefficient is not greater than the preset number of days: The power limit threshold of the time period is determined according to the reverse power transmission abnormality coefficient on different dates, and the power limit strategy of the time period is determined based on the power limit threshold.

[0041] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0042] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0043] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims

1. A photovoltaic power control method for a transformer, characterized in that: Specifically include: Based on the monitoring data of the transformer, reverse current data of different users in different time periods are determined, and reverse power transmission users among the users are determined by using the analysis results of the reverse current data; When it is determined that it is not necessary to adopt a preset strategy to control the photovoltaic power on the low-voltage side of the transformer based on the reverse current data of different reverse power transmission users in different current intervals, proceed to the next step; Determine analysis results of reverse current data of different users in different time periods, and use the analysis results to determine common reverse current time periods of different users; Based on the matching data of common reverse transmission periods in different time periods, matching users are determined, and the power limitation strategies for different time periods are determined using the reverse current data of different matching users in the time periods. Based on the monitoring data of the output power of the transformer and the power limitation strategy, it is determined whether photovoltaic power limitation processing is required.

2. A photovoltaic power control method for a transformer as claimed in claim 1, characterized in that: The reverse current data includes the number of reverse power transmissions, the reverse current amplitudes corresponding to different reverse power transmission numbers, and the durations.

3. A photovoltaic power control method for a transformer as claimed in claim 1, characterized in that: The method for determining the reverse power transmission users among the users is: Determine the number of reverse power transmissions of the user on different dates by using the analysis result of the reverse current data, and determine the cumulative duration of the reverse power transmissions on different dates by the duration of the different reverse power transmissions; The reverse power transmission date of the user is determined by the accumulated duration of different dates, and whether the user is a reverse power transmission user is determined by the number of the reverse power transmission dates.

4. A photovoltaic power control method for a transformer as claimed in claim 3, characterized in that: The reverse power transmission date of the user is the date when the cumulative duration is greater than the preset duration.

5. A photovoltaic power control method for a transformer as claimed in claim 3, characterized in that: When the number of the reverse power transmission dates of the user is greater than the preset number of power transmission dates, the user is determined to be a reverse power transmission user.

6. A photovoltaic power control method for a transformer as claimed in claim 1, characterized in that: The method for determining the common feedback period of the user is: Determine the number of reverse power transmissions in the target time periods on different dates based on the analysis results of the reverse current data of the user in the target time period; Determine the total number of reverse power transmissions for the user according to the number of reverse power transmissions during target time periods on different dates; Whether the target time period is a common reverse power transmission time period is determined based on the total number of reverse power transmissions of the user.

7. A photovoltaic power control method for a transformer as claimed in claim 6, characterized in that: When the total number of reverse power transmissions in the target time period is not within a preset number range, the target time period is determined to be a common reverse power transmission time period.

8. A photovoltaic power control method for a transformer as claimed in claim 1, characterized in that: The matching users are users who have a common feedback period in the time period.

9. A photovoltaic power control method for a transformer as claimed in claim 1, characterized in that: The method for determining the power limitation strategy of the time period is: Determine the cumulative reverse power transmission duration of the matching user in the time period based on the reverse current data of the matching user in the time period; Obtaining the cumulative duration of reverse power transmission of the matched user in the time period, and determining the total of the cumulative duration in combination with the number of the matched users; A power limiting strategy for the time period is determined based on the accumulated time period.

10. A computer system comprising: A memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that the processor executes a photovoltaic power control method for a transformer as described in any one of claims 1-9 when running the computer program.

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