Photovoltaic power controller installed on transformer and power control method
By monitoring the photovoltaic access capacity and rated capacity of the transformer, the photovoltaic system groups are divided, and the photovoltaic power controller is set based on the monitoring data and historical fault data, the impact of photovoltaic power supply on the grid stability is solved, and the reliability and cost-effectiveness of the transformer operation are improved.
Patent Information
- Application Number
- CN202411735613.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-02-28
AI Technical Summary
The electrical energy output of a photovoltaic power supply changes with the intensity of light. If it is not adjusted in time, it may cause fluctuations in the grid voltage and frequency, affecting the stability of the grid.
By monitoring the photovoltaic access capacity and rated capacity of the transformer, the access needs are determined, and different photovoltaic system groups are divided. Based on the monitoring data and historical fault data, it is decided to set up a photovoltaic power controller on the low-voltage side of the transformer to perform power control.
The impact on the transformer is evaluated from the perspective of the proportion of the access capacity and the rated capacity of the photovoltaic system, avoiding the problem of high equipment costs and improving the reliability of the transformer operation.
Smart Images
Figure CN119543320A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of power control, and in particular relates to a photovoltaic power controller installed on a transformer and a power control method. Background Art
[0002] The power output of photovoltaic power sources will change with changes in light intensity. If the output of the photovoltaic system cannot be adjusted in time, the access of photovoltaic power sources may cause fluctuations in grid voltage, frequency and other parameters, thereby affecting the stability of the grid to a certain extent.
[0003] In response to the above technical problems, the present application specifically provides a photovoltaic power controller installed on a transformer and a power control method. Summary of the invention
[0004] To achieve the purpose of the present invention, the present invention adopts the following technical solution: According to one aspect of the present invention, a power control method is provided.
[0005] A power control method, specifically comprising: S1 uses the monitoring data of the photovoltaic access capacity of the transformer to determine the change data of the monitoring data, and when it is determined that the transformer has a photovoltaic power controller access requirement in combination with the rated capacity of the transformer, proceed to the next step; S2 determines deviation data of access electric energy of different access photovoltaic systems in different time periods based on the access photovoltaic system of the transformer, and divides the access photovoltaic systems into different photovoltaic system groups using the deviation data; S3: obtaining access data and capacity data of access photovoltaic systems in different photovoltaic system groups, and determining that the transformer needs to be set with a photovoltaic power controller in combination with the deviation data of access electric energy between different photovoltaic system groups, and setting the photovoltaic power controller on the low voltage side of the transformer; S4 uses the analysis results of the monitoring data of the photovoltaic system connected in the photovoltaic power controller and the historical fault data of different types of transformers to determine whether it is necessary to use the photovoltaic power controller to perform power control.
[0006] The beneficial effects of the present invention are: Based on the change data of the monitoring data and the rated capacity of the transformer, it is determined whether the transformer has the need to access the photovoltaic power controller, thereby realizing the evaluation of the impact of the photovoltaic system on the transformer from the perspective of the ratio of the access capacity of the photovoltaic system to the rated capacity, avoiding the technical problem of high equipment cost caused by setting the photovoltaic power controller when the access capacity of the photovoltaic system in the transformer is small, and also ensuring the reliability of the operating status of the transformer.
[0007] The analysis results of the monitoring data of the photovoltaic system connected in the photovoltaic power controller and the historical fault data of different types of transformers are used to determine whether the photovoltaic power controller needs to be used for power control. Not only the deviation of the power quality of the photovoltaic system connected is taken into account, but also the impact of the deviation of the power quality on different parts of the transformer is taken into account. In addition, the historical fault conditions of different parts are further combined to realize the determination of the control mode of the photovoltaic power controller from two perspectives: the equipment side and the photovoltaic power side, thereby improving the operating reliability of the transformer.
[0008] A further technical solution is that the monitoring data of the photovoltaic access capacity is determined according to the analysis result of the historical operation data of the transformer, specifically including the access capacity in different time periods.
[0009] A further technical solution is that the rated capacity of the transformer is determined based on an identification result of a unique device identifier of the transformer.
[0010] A further technical solution is to determine whether the transformer has a need to access a photovoltaic power controller, specifically including: Determine the photovoltaic access capacity at different time periods on different dates based on the monitoring data of the photovoltaic access capacity, and determine the attention period in different time periods based on the ratio of the photovoltaic access capacity to the rated capacity of the transformer; Determining the attention dates in the dates according to the number of attention periods in different dates; It is determined whether there is a need to connect a photovoltaic power controller to the transformer based on the number of the attention dates.
[0011] A further technical solution is that the attention period is a period when the ratio of the photovoltaic access capacity to the rated capacity of the transformer is greater than a preset capacity ratio.
[0012] A further technical solution is to determine whether it is necessary to use the photovoltaic power controller to perform power control, specifically including: Utilize the analysis results of the monitoring data of the connected photovoltaic system in the photovoltaic power controller and the historical fault data of different types of transformers; Determine the access power waveform at different times based on the analysis results of the monitoring data of the access photovoltaic system in the photovoltaic power controller, and determine the power quality deviation time at the time according to the access power waveform at different times; Determine the number of power deviation moments of different power quality deviation types according to the power quality deviation type corresponding to the power deviation moment, and determine the number of power deviation moments corresponding to different fault locations according to the power quality deviation type associated with different fault locations; The fault weight coefficients of different fault locations are determined according to the number of historical faults of different fault locations, and the quantity weights and sums are determined in combination with the number of electric energy deviation moments corresponding to different fault locations. Based on the quantity weights and sums, it is determined whether the photovoltaic power controller needs to be used for power control.
[0013] A further technical solution is that the quantity weight is determined by the sum of the products of the fault weight coefficients of different fault locations and the quantity of the electric energy deviation moments.
[0014] A further technical solution is that when the sum of the quantity weights is greater than a preset weight threshold, it is determined that the photovoltaic power controller needs to be used for power control.
[0015] On the other hand, the present invention provides a photovoltaic power controller installed in a transformer, which is applied to the above-mentioned power control method, specifically comprising: Data monitoring module, power control module; The data monitoring module is responsible for monitoring and processing the photovoltaic input power data; The power control module is responsible for power control of photovoltaic input electric energy.
[0016] 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.
[0017] 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
[0018] 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.
[0019] Figure 1 is a flow chart of a power control method; Figure 2 It is a flow chart for determining the need for access to a photovoltaic power controller in a transformer; Figure 3 It is a flow chart to determine the settings of the photovoltaic power controller required for the transformer; Figure 4It is a frame diagram of a photovoltaic power controller installed on a transformer. DETAILED DESCRIPTION
[0020] 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.
[0021] For ease of understanding, the scheme will be described below through Example 1 and Example 2. Example 1
[0022] To solve the above problems, according to one aspect of the present invention, Figure 1 As shown, according to one aspect of the present invention, a power control method is provided, which specifically includes: S1 uses the monitoring data of the photovoltaic access capacity of the transformer to determine the change data of the monitoring data, and when it is determined that the transformer has a photovoltaic power controller access requirement in combination with the rated capacity of the transformer, proceed to the next step; Furthermore, the monitoring data of the photovoltaic access capacity is determined according to the analysis result of the historical operation data of the transformer, specifically including the access capacity in different time periods.
[0023] Specifically, the rated capacity of the transformer is determined according to the identification result of the unique device identifier of the transformer.
[0024] Specifically, Figure 2 As shown, determining that the transformer has a need to access a photovoltaic power controller specifically includes: Determine the photovoltaic access capacity at different time periods on different dates based on the monitoring data of the photovoltaic access capacity, and determine the attention period in different time periods based on the ratio of the photovoltaic access capacity to the rated capacity of the transformer; Determining the attention dates in the dates according to the number of attention periods in different dates; It is determined whether there is a need to connect a photovoltaic power controller to the transformer based on the number of the attention dates.
[0025] Furthermore, the attention period is a period when the ratio of the photovoltaic access capacity to the rated capacity of the transformer is greater than a preset capacity ratio.
[0026] It should be noted that the attention date is a date when the number of attention time periods is greater than the number of preset time periods.
[0027] Optionally, determining whether the transformer has a need to access a photovoltaic power controller based on the number of the notice dates specifically includes: When the number of the noted dates is within a preset date number interval, it is determined that the transformer has a photovoltaic power controller access demand.
[0028] In another embodiment, determining that the transformer has a need to access a photovoltaic power controller specifically includes: S11 determines the photovoltaic access capacity at different time periods on different dates based on the monitoring data of the photovoltaic access capacity, and determines the attention period in different time periods based on the ratio of the photovoltaic access capacity to the rated capacity of the transformer; S12 determines the access demand coefficients on different dates according to the distribution data of the attention periods on different dates and the ratios of the photovoltaic access capacity in different attention periods to the rated capacity of the transformer; S13 determines a comprehensive access demand coefficient based on the access demand coefficients on different dates, and uses the comprehensive access demand coefficient to determine whether the transformer has an access demand for a photovoltaic power controller.
[0029] Furthermore, the comprehensive access demand coefficient is determined according to an average value of access demand coefficients on different dates.
[0030] Optionally, when the comprehensive access demand coefficient is greater than a preset demand coefficient threshold, it is determined that the transformer has a demand for access to a photovoltaic power controller.
[0031] S2 determines deviation data of access electric energy of different access photovoltaic systems in different time periods based on the access photovoltaic system of the transformer, and divides the access photovoltaic systems into different photovoltaic system groups using the deviation data; Furthermore, the deviation data of the access electric energy is determined according to the deviation amounts of the access electric energy of different access photovoltaic systems in different time periods.
[0032] It should be noted that the connected photovoltaic systems are divided into different photovoltaic system groups, specifically including: The photovoltaic systems connected in different time periods whose deviation of the connected electric energy is within a preset deviation range are divided into the same photovoltaic system group.
[0033] S3: obtaining access data and capacity data of access photovoltaic systems in different photovoltaic system groups, and determining that the transformer needs to be set with a photovoltaic power controller in combination with the deviation data of access electric energy between different photovoltaic system groups, and setting the photovoltaic power controller on the low voltage side of the transformer; Furthermore, the access data includes the number of photovoltaic systems in the photovoltaic system group.
[0034] It should also be noted that the capacity data includes the capacities of different photovoltaic systems in the photovoltaic system group.
[0035] Optionally, if Figure 3 As shown, it is determined that the transformer needs to be set up with a photovoltaic power controller, specifically including: Determine the access quantity and access capacity of the access photovoltaic systems in the photovoltaic system group according to the access data and capacity data of the access photovoltaic systems in the photovoltaic system group, and determine the attention system group in the photovoltaic system group by using the access quantity and access capacity; Based on the deviation data of the access power between the attention system groups, determining the deviation of the access power between different attention system groups at different time periods, and determining the power deviation between different attention system groups by using the average value of the deviation of the access power at different time periods; The deviation system group in the attention system group is determined by the electric energy deviation between different attention system groups, and the number of the attention system groups is used to determine whether the transformer needs to be set with a photovoltaic power controller.
[0036] Furthermore, the attention system group is a photovoltaic system group whose access number is greater than a preset access number or whose access capacity is greater than a preset access capacity.
[0037] It should also be noted that the deviation system group is an attention system group whose power deviation with other attention system groups is greater than a preset power deviation threshold.
[0038] Optionally, when the number of the noted system groups is greater than the preset number of system groups, it is determined that the transformer needs to be set with a photovoltaic power controller.
[0039] Optionally, determining that the transformer needs to be set up with a photovoltaic power controller specifically includes: Determine the number of photovoltaic systems connected to the transformer according to the access data and capacity data of the photovoltaic systems connected to the photovoltaic system group, and when the number of photovoltaic systems connected to the transformer is greater than the preset number of photovoltaic systems connected to the transformer, determine that the transformer needs to be set with a photovoltaic power controller; When the number of photovoltaic systems connected to the transformer is not greater than the preset number of connected systems: Determine access attention coefficients of different photovoltaic system groups according to the access quantity and access capacity of access photovoltaic systems in different photovoltaic system groups, and determine screening system groups in the photovoltaic system groups using the access attention coefficients, and when the number of screening system groups in the photovoltaic system groups is greater than a preset screening group number threshold, determine that the transformer needs to be set with a photovoltaic power controller; When the number of the screening system groups in the photovoltaic system group is not greater than the preset screening group number threshold: Based on the deviation data of the access power between the attention system groups, determining the deviation of the access power between different attention system groups at different time periods, and determining the power deviation between different attention system groups by using the average value of the deviation of the access power at different time periods; Determine the deviation system group in the attention system group by the electric energy deviation between different attention system groups, and when the number of the attention system groups does not meet the requirement, determine that the transformer needs to be set with a photovoltaic power controller; When the number of attention system groups meets the requirement: The power deviation coefficient is determined by the power deviation amount between different attention system groups and other attention system groups and the access attention coefficients of different attention system groups, and the power deviation coefficient is used to determine whether the transformer needs to be set with a photovoltaic power controller.
[0040] S4 uses the analysis results of the monitoring data of the photovoltaic system connected in the photovoltaic power controller and the historical fault data of different types of transformers to determine whether it is necessary to use the photovoltaic power controller to perform power control.
[0041] Furthermore, the historical fault data is determined according to the associated fault locations of the transformer, and specifically includes the number of faults at different fault locations.
[0042] Specifically, determining whether it is necessary to use the photovoltaic power controller to perform power control specifically includes: Utilize the analysis results of the monitoring data of the connected photovoltaic system in the photovoltaic power controller and the historical fault data of different types of transformers Determine the access power waveform at different times based on the analysis results of the monitoring data of the access photovoltaic system in the photovoltaic power controller, and determine the power quality deviation time at the time according to the access power waveform at different times; Determine the number of power deviation moments of different power quality deviation types according to the power quality deviation type corresponding to the power deviation moment, and determine the number of power deviation moments corresponding to different fault locations according to the power quality deviation type associated with different fault locations; The fault weight coefficients of different fault locations are determined according to the number of historical faults of different fault locations, and the quantity weights and sums are determined in combination with the number of electric energy deviation moments corresponding to different fault locations. Based on the quantity weights and sums, it is determined whether the photovoltaic power controller needs to be used for power control.
[0043] Furthermore, the quantity weight is determined by the sum of the products of the fault weight coefficients of different fault locations and the quantity at the time of the electric energy deviation.
[0044] Optionally, when the sum of the quantity weights is greater than a preset weight threshold, it is determined that the photovoltaic power controller needs to be used for power control. Example 2
[0045] On the other hand, Figure 4 As shown, the present invention provides a photovoltaic power controller installed in a transformer, which is applied to the above-mentioned power control method, specifically comprising: Data monitoring module, power control module; The data monitoring module is responsible for monitoring and processing the photovoltaic input power data; The power control module is responsible for power control of photovoltaic input electric energy.
[0046] Optionally, the above step S11 includes the following contents: S111 determines the photovoltaic access capacity at different time periods on different dates based on the monitoring data of the photovoltaic access capacity, and when it is determined that there is a caution period in the time period based on the ratio of the photovoltaic access capacity to the rated capacity of the transformer, the process proceeds to step S112. When there is no caution period in the time period, it is determined that there is no access demand for the photovoltaic power controller of the transformer; S112 obtains the number of attention periods. When the number of attention periods is greater than a preset threshold value of the number of attention periods, it is determined that the transformer has a need to access a photovoltaic power controller. When the number of attention periods is not greater than the preset threshold value of the number of attention periods, the process proceeds to step S113. S113: When the number of the attention time periods is within the preset time period number interval, the process proceeds to step S114; when the number of the attention time periods is not within the preset time period number interval, the process proceeds to step S12; S114 takes the average value of the ratio of the photovoltaic access capacity in different attention periods to the rated capacity of the transformer as the capacity ratio average value. When the capacity ratio average value is greater than the preset capacity threshold, it is determined that the transformer has a photovoltaic power controller access demand. When the capacity ratio average value is not greater than the preset capacity threshold, the process proceeds to step S115. S115 determines the distribution clustering coefficient of the attention period based on the number of attention periods and the interval lengths between different attention periods. When the distribution clustering coefficient of the attention period is greater than the preset clustering coefficient threshold, it is determined that the transformer has a need to access a photovoltaic power controller. When the distribution clustering coefficient of the attention period is not greater than the preset clustering coefficient threshold, proceed to step S12.
[0047] Optionally, the above step S12 includes the following contents: S121 determines the attention dates in the dates according to the distribution data of the attention periods in different dates. When the number of the attention dates is within the preset date number interval, it is determined that the transformer has a connection demand for the photovoltaic power controller. When the number of the attention dates is not within the preset date number interval, proceed to step S122. S122 determines the access demand coefficients of different dates according to the distribution data of the attention periods in different dates and the ratio of the photovoltaic access capacity in different attention periods to the rated capacity of the transformer, and when there is a date with an access demand coefficient greater than a preset coefficient threshold, proceeds to step S123; when there is no date with an access demand coefficient less than the preset coefficient threshold, proceeds to step S13; S123 takes the date when the access demand coefficient is greater than the preset coefficient threshold as the access demand date. When the number of the access demand dates is greater than the preset demand date number, it is determined that the transformer has an access demand for the photovoltaic power controller. When the number of the access demand dates is not greater than the preset demand date number, proceed to step S13.
[0048] 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.
[0049] 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.
[0050] 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 power control method, characterized in that: Specifically include: Using the monitoring data of the photovoltaic access capacity of the transformer, determining the change data of the monitoring data, and when determining that the transformer has a photovoltaic power controller access requirement in combination with the rated capacity of the transformer, proceeding to the next step; Based on the photovoltaic system connected to the transformer, determining deviation data of access electric energy of different photovoltaic systems in different time periods, and using the deviation data to divide the photovoltaic systems into different photovoltaic system groups; Access data and capacity data of access photovoltaic systems in different photovoltaic system groups are obtained, and when it is determined that the transformer needs to be set up with a photovoltaic power controller in combination with deviation data of access electric energy between different photovoltaic system groups, the photovoltaic power controller is set up on the low-voltage side of the transformer; The analysis results of the monitoring data of the photovoltaic system connected in the photovoltaic power controller and the historical fault data of different types of transformers are used to determine whether it is necessary to use the photovoltaic power controller to perform power control.
2. A power control method as claimed in claim 1, characterized in that: The monitoring data of the photovoltaic access capacity is determined according to the analysis result of the historical operation data of the transformer, and specifically includes the access capacity in different time periods.
3. A power control method as claimed in claim 1, characterized in that: The rated capacity of the transformer is determined according to the identification result of the unique device identification of the transformer.
4. A power control method as claimed in claim 1, characterized in that: Determine that the transformer has a need to access a photovoltaic power controller, specifically including: Determine the photovoltaic access capacity at different time periods on different dates based on the monitoring data of the photovoltaic access capacity, and determine the attention period in different time periods based on the ratio of the photovoltaic access capacity to the rated capacity of the transformer; Determining the attention dates in the dates according to the number of attention periods in different dates; It is determined whether there is a need to connect a photovoltaic power controller to the transformer based on the number of the attention dates.
5. A power control method as claimed in claim 4, characterized in that: The attention period is a period when the ratio of the photovoltaic access capacity to the rated capacity of the transformer is greater than a preset capacity ratio.
6. A power control method as claimed in claim 4, characterized in that: Determining whether the transformer has a need to access a photovoltaic power controller based on the number of the notice dates specifically includes: When the number of the noted dates is within a preset date number interval, it is determined that the transformer has a photovoltaic power controller access demand.
7. A power control method as claimed in claim 1, characterized in that: Determining whether it is necessary to use the photovoltaic power controller to perform power control specifically includes: Determine the access power waveform at different times based on the analysis results of the monitoring data of the access photovoltaic system in the photovoltaic power controller, and determine the power quality deviation time at the time according to the access power waveform at different times; Determine the number of power deviation moments of different power quality deviation types according to the power quality deviation type corresponding to the power deviation moment, and determine the number of power deviation moments corresponding to different fault locations according to the power quality deviation type associated with different fault locations; The fault weight coefficients of different fault locations are determined according to the number of historical faults of different fault locations, and the quantity weights and sums are determined in combination with the number of electric energy deviation moments corresponding to different fault locations. Based on the quantity weights and sums, it is determined whether the photovoltaic power controller needs to be used for power control.
8. A power control method as claimed in claim 7, characterized in that: The quantity weight sum is determined based on the sum of the products of the fault weight coefficients of different fault locations and the quantity of the electric energy deviation moments.
9. A power control method as claimed in claim 7, characterized in that: When the sum of the quantity weights is greater than a preset weight threshold, it is determined that the photovoltaic power controller needs to be used for power control.
10. A photovoltaic power controller installed in a transformer, applied to a power control method according to any one of claims 1 to 9, specifically comprising: Data monitoring module, power control module; The data monitoring module is responsible for monitoring and processing the photovoltaic input power data; The power control module is responsible for power control of photovoltaic input electric energy.