Method and device for transformer area photovoltaic access scheme, medium and equipment

Abstract

The invention discloses a method and device for a transformer area photovoltaic access scheme, a medium and equipment. The method comprises the following steps: establishing a transformer area topology model; establishing an electrical load balancing strategy based on the transformer area topology model, and leveling the electrical load according to the electrical load balancing strategy to enable the electrical load to be balanced; and establishing a photovoltaic access balance strategy, and leveling the photovoltaic access according to the photovoltaic access balance strategy so as to enable the photovoltaic access to reach balance. According to the invention, reasonable and orderly photovoltaic load access is realized by combining the three-phase load operation characteristics based on the existing operation condition of the transformer area, the photovoltaic load is consumed nearby and locally, and three-phase load balance and voltage balance are considered. And the operation stability and reliability of the power system are improved.

Description

Technical Field

[0001] The present application relates to the field of power distribution technology, and in particular to a method, device, medium, and equipment for a photovoltaic access solution in a substation. Background Art

[0002] A large number of distributed photovoltaics are connected to rural substations. The randomness and volatility of their active output and the uneven and diverse characteristics of rural grid load access together cause the mismatch between the source and load timing in rural substations, which in turn leads to phenomena such as active power reverse transmission and bidirectional power flow. Due to the weak rural grid structure and the long power supply distance of distribution transformers, the voltage over-limit and line loss exceeding standard problems in rural substations under high penetration photovoltaic access are relatively serious. How to orderly connect photovoltaic loads under the existing substation operating conditions and reduce the impact on the power quality of the substation is an urgent problem that needs to be solved. Summary of the invention

[0003] In view of this, the present application provides a method, device, medium, and equipment for a photovoltaic access scheme in a substation area. The main purpose is to level the photovoltaic access based on the current situation of the substation area and the leveling of the power load, thereby avoiding the problems of active power reverse transmission, two-way power flow, and voltage over-limit and line loss exceeding the standard in rural substation areas under high penetration photovoltaic access, and realizing reasonable and orderly photovoltaic load access, so that the photovoltaic load can be consumed nearby and on-site, taking into account the three-phase load balance and voltage balance. The stability and reliability of the power system operation are improved.

[0004] According to one aspect of the present application, a method for a photovoltaic access solution in a metropolitan area is provided, the method comprising:

[0005] Establish the area topology model;

[0006] Based on the substation topology model, a power load balancing strategy is established, and the power load is leveled according to the power load balancing strategy so that the power load is balanced;

[0007] A photovoltaic access balancing strategy is established, and photovoltaic access is leveled according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance.

[0008] Optionally, the substation topology model respectively integrates the hierarchical topological architecture of the substation, trunk line, branch line, pole tower, meter box, electric meter and the power consumption phase sequence of each load.

[0009] Optionally, leveling the power load according to the power load balancing strategy so that the power load is balanced includes:

[0010] Using a preset terminal backward balancing method, starting from the terminal tower in the substation topology model, for each tower, determining the constant cumulative load and the load to be adjusted corresponding to the tower, and leveling the tower load based on the constant cumulative load and the load to be adjusted;

[0011] The step of leveling the tower load based on the unchanged accumulated load and the load to be adjusted includes:

[0012]

[0013] Among them, [W A , W B , W C ] is the current cumulative load of the tower A, B, C phase, [a′ i , b′ i , c′ i ] is the load vector adjusted for the i-th user;

[0014] According to the formula W av =(W A +W B +W c ) / 3, using the accumulated load, calculate the average value of the three-phase load of the tower, and respectively according to the formula ΔW A =W A -W av , ΔW B =W B -W av , ΔW C =W C -W av Calculate the load that needs to be adjusted for each phase of the three-phase load of the tower, where a positive value of ΔW represents the load that needs to be adjusted out, and a negative value of ΔW represents the load that needs to be adjusted in, and level the three-phase load of the tower according to the load that needs to be adjusted for each phase, so that the load of the tower is balanced;

[0015] When the load of the tower is balanced, the load is gradually extended upward to the branch lines so that the load of the branch lines is balanced;

[0016] When the load of the branch line reaches a balance, it is gradually included in the trunk line to balance the load of the trunk line;

[0017] When the trunk line load reaches a balance, it is gradually included in the substation area to balance the load of the substation area.

[0018] Optionally, after determining the unchanged cumulative load and the load to be adjusted corresponding to the tower, the method further includes:

[0019] When the load corresponding to any user among the loads to be adjusted exceeds 20% of the total load of the substation, the user load is checked to obtain the total load capacity corresponding to the user, and the total load capacity is evenly divided into phases A, B, and C to balance the load corresponding to the user.

[0020] Optionally, before leveling the tower load based on the unchanged accumulated load and the load to be adjusted, the method further includes:

[0021] The constant cumulative load and the load to be adjusted are added together, and according to the calculation result, the following load imbalance calculation formula is used to calculate the initial imbalance index f c

[0022]

[0023] Among them, W max is the maximum phase load, W min is the minimum phase load;

[0024] Move any load to be adjusted leftward and rightward respectively, and calculate two new unbalance indexes f after moving leftward and rightward. li and f ri , until all loads to be adjusted n are adjusted, and 2n unbalance indexes are obtained, from which the minimum unbalance index f is selected u With the initial imbalance index f c If the former is smaller, the initial imbalance index f c Updated to the minimum imbalance index f u , record the execution of the minimum imbalance index f u Corresponding to the user's adjustment plan, and continue to iterate, otherwise output the initial imbalance index f c and phase modulation schemes for all users.

[0025] Optionally, leveling photovoltaic access according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance includes:

[0026] Determine whether the photovoltaic access is single-phase photovoltaic or three-phase photovoltaic;

[0027] If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit, so that the photovoltaic of the branch circuit is balanced;

[0028] If it is the three-phase photovoltaic, directly connect the three-phase photovoltaic to the access capacity of each phase sequence in the branch circuit;

[0029] When the photovoltaic power of the branch line reaches balance, the terminal reverse balancing method is used to gradually include the trunk line and the substation for leveling, so that the photovoltaic power of the trunk line and the substation reach balance.

[0030] Optionally, if the single-phase photovoltaic is used, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit so that the photovoltaic of the branch circuit is balanced, including:

[0031] When the single-phase photovoltaic includes multiple, calculate the access capacity of each single-phase photovoltaic, and add up each of the access capacities to obtain the total photovoltaic access capacity;

[0032] The total photovoltaic access capacity is evenly divided into the access capacity of each phase sequence in the branch line.

[0033] According to another aspect of the present application, a balancing device for power load and photovoltaic access in a substation is provided, the device comprising:

[0034] Establishing a module for establishing a substation topology model;

[0035] A first leveling module is used to establish a power load balancing strategy based on the substation topology model, and level the power load according to the power load balancing strategy to balance the power load;

[0036] The second leveling module is used to establish a photovoltaic access balancing strategy and level the photovoltaic access according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance.

[0037] Optionally, the substation topology model respectively integrates the hierarchical topological architecture of the substation, trunk line, branch line, pole tower, meter box, electric meter and the power consumption phase sequence of each load.

[0038] Optionally, the first leveling module is further used for:

[0039] Using a preset terminal backward balancing method, starting from the terminal tower in the substation topology model, for each tower, determining the constant cumulative load and the load to be adjusted corresponding to the tower, and leveling the tower load based on the constant cumulative load and the load to be adjusted;

[0040] The step of leveling the tower load based on the unchanged accumulated load and the load to be adjusted includes:

[0041] Based on the constant cumulative load [W a , W b , W c ] and the load to be adjusted [a i ,b i ,c i](i=1,...,n), and calculate the cumulative load of the current tower according to the following formula to balance the cumulative load of the current tower;

[0042]

[0043] Among them, [W A , W B , W C ] is the current cumulative load of the tower A, B, C phase, [a′ i , b′ i , c′ i ] is the load vector adjusted for the i-th user;

[0044] According to the formula W av =(W A +W B +W c ) / 3, using the accumulated load, calculate the average value of the three-phase load of the tower, and respectively according to the formula ΔW A =W A -W av , ΔW B =W B -W av , ΔW C =W C -W av Calculate the load that needs to be adjusted for each phase of the three-phase load of the tower, where a positive value of ΔW represents the load that needs to be adjusted out, and a negative value of ΔW represents the load that needs to be adjusted in, and level the three-phase load of the tower according to the load that needs to be adjusted for each phase, so that the load of the tower is balanced;

[0045] When the tower load reaches a balance, the branch lines are gradually included upwards to balance the branch lines;

[0046] When the load of the branch line reaches a balance, it is gradually included in the trunk line to balance the load of the trunk line;

[0047] When the trunk line load reaches a balance, it is gradually included in the substation area to balance the load of the substation area.

[0048] Optionally, the device further comprises:

[0049] The clarification module is used to clarify the user's load when the load corresponding to any user in the load to be adjusted exceeds 20% of the total load of the substation, obtain the total load capacity corresponding to the user, and evenly divide the total load capacity into phases A, B, and C to balance the load corresponding to the user.

[0050] Optionally, the device further comprises:

[0051] A calculation module is used to add the unchanged cumulative load and the load to be adjusted, and according to the calculation result, use the following load imbalance calculation formula to calculate the initial imbalance index f c ;

[0052]

[0053] Among them, W max is the maximum phase load, W min is the minimum phase load;

[0054] Move any load to be adjusted leftward and rightward respectively, and calculate two new unbalance indexes f after moving leftward and rightward. li and f ri , until all loads to be adjusted n are adjusted, and 2n unbalance indexes are obtained, from which the minimum unbalance index f is selected u With the initial imbalance index f c If the former is smaller, the initial imbalance index f c Updated to the minimum imbalance index f u , record the execution of the minimum imbalance index f u Corresponding to the user's adjustment plan, and continue to iterate, otherwise output the initial imbalance index f c and phase modulation schemes for all users.

[0055] Optionally, the second leveling module is further used for:

[0056] Determine whether the photovoltaic access is single-phase photovoltaic or three-phase photovoltaic;

[0057] If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit, so that the photovoltaic of the branch circuit is balanced;

[0058] If it is the three-phase photovoltaic, directly connect the three-phase photovoltaic to the access capacity of each phase sequence in the branch circuit;

[0059] When the photovoltaic power of the branch line reaches balance, the terminal reverse balancing method is used to gradually include the trunk line and the substation for leveling, so that the photovoltaic power of the trunk line and the substation reach balance.

[0060] Optionally, the second leveling module is further used for:

[0061] When the single-phase photovoltaic includes multiple, calculate the access capacity of each single-phase photovoltaic, and add up each of the access capacities to obtain the total photovoltaic access capacity;

[0062] The total photovoltaic access capacity is evenly divided into the access capacity of each phase sequence in the branch line.

[0063] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method for implementing the above-mentioned photovoltaic access solution for the metropolitan area is implemented.

[0064] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the above-mentioned method of photovoltaic access scheme for the substation when executing the program.

[0065] By means of the above technical scheme, the present application provides a method, device, medium, and equipment for a photovoltaic access scheme in a substation. First, a substation topology model is established. Secondly, based on the substation topology model, a power load balancing strategy is established, and the power load is leveled according to the power load balancing strategy to balance the power load. Finally, a photovoltaic access balancing strategy is established, and photovoltaic access is leveled according to the photovoltaic access balancing strategy to balance the photovoltaic access. Based on the current situation of the substation, the present application levels photovoltaic access on the basis of leveling the power load, thereby avoiding the problems of active power reverse transmission, bidirectional power flow, and voltage over-limit and line loss exceeding in rural substations under high penetration photovoltaic access, and realizes reasonable and orderly photovoltaic load access, so that the photovoltaic load is consumed nearby, taking into account the three-phase load balance and voltage balance. The stability and reliability of the power system operation are improved.

[0066] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0068] Figure 1 A schematic diagram of a method for implementing a photovoltaic access solution in a substation area provided in an embodiment of the present application is shown;

[0069] Figure 2 A schematic diagram of a process for another photovoltaic access solution for a metropolitan area provided in an embodiment of the present application is shown;

[0070] Figure 3 The first part of the schematic diagram of the substation topology model provided by the embodiment of the present application is shown;

[0071] Figure 4 A second schematic diagram of the area topology model provided in an embodiment of the present application is shown;

[0072] Figure 5 The third part of the schematic diagram of the substation topology model provided in the embodiment of the present application is shown;

[0073] Figure 6 A schematic diagram of the combined optimization method provided in the embodiment of the present application is shown;

[0074] Figure 7 A schematic diagram of the structure of a device for a photovoltaic access solution in a metropolitan area provided in an embodiment of the present application is shown;

[0075] Figure 8 A schematic diagram of the device structure of a computer device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0076] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0077] In this embodiment, a method for photovoltaic access solution in a substation is provided, such as Figure 1 As shown, the method includes:

[0078] Step 101: Establish a substation topology model.

[0079] Step 102: establishing a power load balancing strategy based on the substation topology model, and adjusting the power load according to the power load balancing strategy to balance the power load.

[0080] Step 103: establish a photovoltaic access balancing strategy, and level the photovoltaic access according to the photovoltaic access balancing strategy, so that the photovoltaic access reaches a balance.

[0081] In the embodiment of the present application, firstly, a substation topology model is established based on the existing operating conditions of the substation, such as Figures 3 to 5 As shown. Then, after the substation topology model is established, a power load balancing strategy is established based on the substation topology model, and the power load is leveled according to the power load balancing strategy to achieve a balanced power load. When the power load is balanced, a photovoltaic access balancing strategy is established, and photovoltaic access is leveled according to the photovoltaic access balancing strategy to achieve a balanced photovoltaic access.

[0082] By applying the technical solution of this embodiment, based on the substation topology model, a power load balancing strategy is established, and the power load is leveled according to the power load balancing strategy. After the power load is balanced, a photovoltaic access balancing strategy is established, and photovoltaic access is leveled according to the photovoltaic access balancing strategy to achieve a balanced photovoltaic access. This avoids the problems of active power reverse transmission, bidirectional power flow, and voltage over-limit and line loss exceeding the standard in rural substations under high penetration photovoltaic access, realizes reasonable and orderly photovoltaic load access, reduces the impact on the power quality of the substation, and achieves the nearby consumption of photovoltaic loads, taking into account the three-phase load balance and voltage balance. The stability and reliability of the power system operation are improved.

[0083] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another method of photovoltaic access scheme in the substation is provided, such as Figure 2 As shown, the method includes:

[0084] Step 201: Establish a substation topology model.

[0085] Optionally, in step 201, the substation topology model respectively integrates the hierarchical topological architecture of the substation, trunk line, branch line, tower, meter box, and electric meter, as well as the power consumption phase sequence of each load.

[0086] In this embodiment, based on the existing operating conditions of the substation, a substation topology model is established, where Figures 3 to 5 As shown, the substation topology model integrates the hierarchical topological architecture of the substation, trunk line, branch line, tower, meter box, electric meter (user) and the power phase sequence of each load.

[0087] Step 202: Establish a power load balancing strategy based on the substation topology model.

[0088] In this embodiment, after the substation topology model is established, a power load balancing strategy is established based on the substation topology model to level the power load.

[0089] Step 203, using a preset terminal backward balance method, starting from the terminal tower in the substation topology model, for each tower, determine the unchanged cumulative load and the load to be adjusted corresponding to the tower.

[0090] Step 204, when the load corresponding to any user in the load to be adjusted exceeds 20% of the total load of the substation, the user load is checked to obtain the total load capacity corresponding to the user, and the total load capacity is evenly divided into phases A, B, and C to balance the load corresponding to the user.

[0091] In this embodiment, after the power load balancing strategy is established, the power load is leveled according to the power load balancing strategy, that is, the terminal backward balancing method is adopted, starting from the terminal tower in the substation topology model, and specifically combined with Figures 3 to 5 As shown, starting from the end of the A4A1B4 tower, the A4B4 tower, the B4A4 tower, and the B4B3 tower, for each tower, the constant cumulative load and the load to be adjusted corresponding to the tower are determined. After determining the load to be adjusted, it is determined whether there is a user whose load exceeds 20% of the total load of the area. If so, the load leveling process is performed for the user, that is, by checking the load of the user, the total load capacity of the user is obtained, and then the total load capacity is evenly divided into phase A, phase B, and phase C, so as to achieve the purpose of internal leveling of the user. For example, if a user's load is a single-phase load, if the user's load exceeds 20% of the total load of the area, the user's load is checked to obtain the total load capacity of the user, and the original single-phase load is changed to a three-phase load within the user, and then the total load capacity is evenly distributed to phases A, B, and C, so as to achieve the purpose of internal leveling of the user.

[0092] Step 205: Level the tower load based on the unchanged accumulated load and the load to be adjusted.

[0093] Optionally, step 205 includes: based on the constant cumulative load [W a , W b , W c ] and the load to be adjusted [a i ,b i ,c i ](i=1,...,n), and calculate the cumulative load of the current tower according to the following formula to balance the cumulative load of the current tower;

[0094]

[0095] Among them, [W A , W B , W C ] is the current cumulative load of the tower A, B, C phase, [a′ i , b′ i , c′ i ] is the load vector adjusted for the i-th user;

[0096] According to the formula W av =(W A +W B +W c ) / 3, using the accumulated load, calculate the average value of the three-phase load of the tower, and respectively according to the formula ΔW A =W A-W av , ΔW B =W B -W av , ΔW C =W C -W av Calculate the load that needs to be adjusted for each phase of the three-phase load of the tower, where a positive value of ΔW represents the load that needs to be adjusted out, and a negative value of ΔW represents the load that needs to be adjusted in, and level the three-phase load of the tower according to the load that needs to be adjusted for each phase, so that the tower reaches balance;

[0097] When the load of the tower reaches balance, the load is gradually extended upward to the branch lines so that the branch lines reach load balance;

[0098] When the load of the branch line reaches a balance, it is gradually included in the trunk line to balance the load of the trunk line;

[0099] When the trunk line load reaches a balance, it is gradually included in the substation area to balance the load of the substation area.

[0100] In this embodiment, first, the unchanged cumulative load and the load to be adjusted of the terminal tower are determined, and the cumulative load of the terminal tower is calculated according to the cumulative load calculation formula, and the three-phase load average value of the terminal tower is calculated according to the cumulative load. The load that needs to be adjusted for each phase of the terminal tower is calculated through the three-phase load average value of the terminal tower, and the three-phase load of the terminal tower is leveled according to the load that needs to be adjusted for each phase, so that the three-phase load of the terminal tower is balanced. Then, after the load of the terminal tower is leveled, the load of the previous level of the terminal tower is leveled step by step, that is, the load of the tower of the previous level of the terminal tower is leveled. For example, after the load of the terminal A4B4 tower is leveled, the load of the previous level A4B3 tower of the terminal A4B4 tower is leveled, and so on, until the branch line, trunk line, and substation are included step by step, and finally the load balance of the entire substation is completed.

[0101] It should be noted that the constant cumulative load and the load to be adjusted of the terminal tower can be set according to actual conditions. After the load of the terminal tower is leveled based on the set constant cumulative load and the load to be adjusted, the leveling result of the load of the terminal tower is used as the constant cumulative load of the tower before the terminal tower, and the user load corresponding to the tower before the terminal tower is used as the load to be adjusted.

[0102] It should also be noted that before step 205, the process also includes: using a preset combined optimization method to reduce the unbalance index by performing phase adjustment on the load to be adjusted, so as to minimize the sum of the loads that need to be adjusted on each phase of the current tower. Figure 6As shown, add the unchanged cumulative load and the load to be adjusted, and according to the calculation results, use the following load imbalance calculation formula to calculate the initial imbalance index f c ;

[0103]

[0104] Among them, W max is the maximum phase load, W min is the minimum phase load;

[0105] Move any load to be adjusted leftward and rightward respectively, and calculate two new unbalance indexes f after moving leftward and rightward. li and f ri , until all loads to be adjusted n are adjusted, and 2n unbalance indexes are obtained, from which the minimum unbalance index f is selected u and the initial imbalance index f c If the former is smaller, the initial imbalance index f c Update to the minimum imbalance index f u , record the execution minimum imbalance index f u Corresponding to the user's adjustment plan, continue to iterate, otherwise output the initial imbalance index f c And the phase adjustment scheme for all users. When adjusting any user will make the imbalance index worse, the iteration is stopped.

[0106] Step 206, determining whether the photovoltaic access is single-phase photovoltaic or three-phase photovoltaic.

[0107] Step 207: If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit to balance the photovoltaic power of the branch circuit.

[0108] Optionally, step 207 includes: when the single-phase photovoltaic includes multiple, calculating the access capacity of each single-phase photovoltaic, and adding each of the access capacities to obtain the total photovoltaic access capacity; and evenly dividing the total photovoltaic access capacity into the access capacity of each phase sequence in the branch line.

[0109] Step 208: If it is the three-phase photovoltaic, directly connect the three-phase photovoltaic to the access capacity of each phase sequence in the branch circuit.

[0110] In this embodiment, on the basis of the load balance in the substation, a photovoltaic access balance strategy is established, and the photovoltaic access is leveled according to the photovoltaic access balance strategy to achieve a balance in the photovoltaic access, that is, it is determined whether the photovoltaic accessed to the branch circuit is single-phase photovoltaic or three-phase photovoltaic. If it is single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly divided into the access capacity of each phase sequence in the branch circuit. When there are multiple single-phase photovoltaics, the access capacity of each single-phase photovoltaic is calculated, and the access capacity of all single-phase photovoltaics is summed to obtain the total photovoltaic access capacity, and the total photovoltaic access capacity is evenly divided into the access capacity of each phase sequence in the branch circuit. For example, there are 3 A-phase photovoltaics, each of which is 3kW. The access capacity of each A-phase photovoltaic can be added to obtain a total photovoltaic access capacity of 9kW, and then 9kW is evenly distributed to the access capacity of the A, B, and C phases in the branch circuit, that is, 3kW is allocated to the access capacity of each phase. If it is a three-phase photovoltaic, since the three-phase photovoltaic itself is evenly divided, there is no need to perform leveling processing, and the three-phase photovoltaic can be directly connected to the access capacity of the corresponding phase sequence in the branch circuit.

[0111] Step 209, when the photovoltaic power of the branch line reaches a balance, the terminal reverse balancing method is used to gradually include the trunk line and the substation for leveling, so that the photovoltaic power of the trunk line and the substation reach a balance.

[0112] Finally, when the photovoltaic power of the branch line reaches balance, the terminal reverse balance method is used to gradually cover the trunk line to balance the photovoltaic power of the trunk line. After the photovoltaic power of the trunk line reaches balance, the terminal reverse balance method is used to gradually cover the substation to balance the photovoltaic power of the substation.

[0113] By applying the technical solution of this embodiment, a substation topology model is established based on the existing operating conditions of the substation. After the substation topology model is established, the terminal reverse balance method is used to level the power load starting from the terminal tower in the substation topology model until the substation power load leveling is completed. When the substation power load leveling is completed, the photovoltaic access is balanced, that is, the photovoltaic access is determined to be single-phase photovoltaic or three-phase photovoltaic. For single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly divided into the access capacity of each phase sequence in the access branch circuit. For three-phase photovoltaic, the access capacity of each phase sequence in the access branch circuit is directly accessed, and the terminal reverse balance method is used to include the trunk line and substation step by step, so that the trunk photovoltaic and substation photovoltaic reach a balance. Thereby avoiding the problems of active power reverse transmission, bidirectional flow, and voltage over-limit and line loss exceeding the standard in rural substations under high penetration photovoltaic access, realizing the reasonable and orderly access of photovoltaic loads, reducing the impact on the power quality of the substation, and achieving the nearby consumption of photovoltaic loads, taking into account the three-phase load balance and voltage balance. Improved the stability and reliability of power system operation.

[0114] Further, as Figure 1The specific implementation of the method, the embodiment of the present application provides a device for a photovoltaic access solution in a substation area, such as Figure 7 As shown, the device comprises:

[0115] Establishing a module for establishing a substation topology model;

[0116] A first leveling module is used to establish a power load balancing strategy based on the substation topology model, and level the power load according to the power load balancing strategy to balance the power load;

[0117] The second leveling module is used to establish a photovoltaic access balancing strategy and level the photovoltaic access according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance.

[0118] Optionally, the substation topology model respectively integrates the hierarchical topological architecture of the substation, trunk line, branch line, pole tower, meter box, electric meter and the power consumption phase sequence of each load.

[0119] Optionally, the first leveling module is further used for:

[0120] Using a preset terminal backward balancing method, starting from the terminal tower in the substation topology model, for each tower, determining the constant cumulative load and the load to be adjusted corresponding to the tower, and leveling the tower load based on the constant cumulative load and the load to be adjusted;

[0121] The step of leveling the tower load based on the unchanged accumulated load and the load to be adjusted includes:

[0122] Based on the constant cumulative load [W a , W b , W c ] and the load to be adjusted [a i ,b i ,c i ](i=1,...,n), and calculate the cumulative load of the current tower according to the following formula to balance the cumulative load of the current tower;

[0123]

[0124] Among them, [W A , W B , W C ] is the current cumulative load of the tower A, B, C phase, [a′ i , b′ i , c′ i ] is the load vector adjusted for the i-th user;

[0125] According to the formula W av =(WA +W B +W c ) / 3, using the accumulated load, calculate the average value of the three-phase load of the tower, and respectively according to the formula ΔW A =W A -W av , ΔW B =W B -W av , ΔW C =W C -W av Calculate the load that needs to be adjusted for each phase of the three-phase load of the tower, where a positive value of ΔW represents the load that needs to be adjusted out, and a negative value of ΔW represents the load that needs to be adjusted in, and level the three-phase load of the tower according to the load that needs to be adjusted for each phase, so that the load of the tower is balanced;

[0126] When the load of the tower is balanced, the load is gradually extended upward to the branch lines so that the load of the branch lines is balanced;

[0127] When the load of the branch line reaches a balance, it is gradually included in the trunk line to balance the load of the trunk line;

[0128] When the trunk line load reaches a balance, it is gradually included in the substation area to balance the load of the substation area.

[0129] Optionally, the device further comprises:

[0130] The clarification module is used to clarify the user's load when the load corresponding to any user in the load to be adjusted exceeds 20% of the total load of the substation, obtain the total load capacity corresponding to the user, and evenly divide the total load capacity into phases A, B, and C to balance the load corresponding to the user.

[0131] Optionally, the device further comprises:

[0132] A calculation module is used to add the unchanged cumulative load and the load to be adjusted, and according to the calculation result, use the following load imbalance calculation formula to calculate the initial imbalance index f c ;

[0133]

[0134] Among them, W max is the maximum phase load, W min is the minimum phase load;

[0135] Move any load to be adjusted leftward and rightward respectively, and calculate two new unbalance indexes f after moving leftward and rightward. liand f ri , until all loads to be adjusted n are adjusted, and 2n unbalance indexes are obtained, from which the minimum unbalance index f is selected u With the initial imbalance index f c If the former is smaller, the initial imbalance index f c Updated to the minimum imbalance index f u , record the execution of the minimum imbalance index f u Corresponding to the user's adjustment plan, and continue to iterate, otherwise output the initial imbalance index f c and phase modulation schemes for all users.

[0136] Optionally, the second leveling module is further used for:

[0137] Determine whether the photovoltaic access is single-phase photovoltaic or three-phase photovoltaic;

[0138] If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit, so that the photovoltaic of the branch circuit is balanced;

[0139] If it is the three-phase photovoltaic, directly connect the three-phase photovoltaic to the access capacity of each phase sequence in the branch circuit;

[0140] When the photovoltaic power of the branch line reaches balance, the terminal reverse balancing method is used to gradually include the trunk line and the substation for leveling, so that the photovoltaic power of the trunk line and the substation reach balance.

[0141] Optionally, the second leveling module is further used for:

[0142] When the single-phase photovoltaic includes multiple, calculate the access capacity of each single-phase photovoltaic, and add up each of the access capacities to obtain the total photovoltaic access capacity;

[0143] The total photovoltaic access capacity is evenly divided into the access capacity of each phase sequence in the branch line.

[0144] It should be noted that for other corresponding descriptions of the functional units involved in the device for a photovoltaic access solution for a metropolitan area provided in the embodiment of the present application, reference can be made to Figure 1 to Figure 2 The corresponding description in the method will not be repeated here.

[0145] The present application also provides a computer device, which may be a personal computer, a server, a network device, etc. Figure 8As shown, the computer device includes a bus, a processor, a memory and a communication interface, and may also include an input and output interface and a display device. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store location information. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in each method embodiment are implemented.

[0146] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0147] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and stores a computer program thereon. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0148] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0149] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0150] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0151] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0152] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for photovoltaic access scheme in a substation, characterized in that: include: Establish the area topology model; Based on the substation topology model, a power load balancing strategy is established, and the power load is leveled according to the power load balancing strategy so that the power load is balanced; A photovoltaic access balancing strategy is established, and photovoltaic access is leveled according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance.

2. The method according to claim 1, characterized in that The substation topology model respectively integrates the hierarchical topological architecture of the substation, trunk line, branch line, pole tower, meter box, and electric meter, as well as the power consumption phase sequence of each load.

3. The method according to claim 1, characterized in that The step of leveling the power load according to the power load balancing strategy so as to balance the power load includes: Using a preset terminal backward balancing method, starting from the terminal tower in the substation topology model, for each tower, determining the constant cumulative load and the load to be adjusted corresponding to the tower, and leveling the tower load based on the constant cumulative load and the load to be adjusted; The step of leveling the tower load based on the unchanged accumulated load and the load to be adjusted includes: Based on the constant cumulative load [W a , W b , W c ] and the load to be adjusted [a i ,b i ,c i ](i=1,...,n), and calculate the cumulative load of the current tower according to the following formula to balance the cumulative load of the current tower; Among them, [W A , W B , W C ] is the current cumulative load of the tower A, B, C phase, [a′ i , b′ i , c′ i ] is the load vector adjusted for the i-th user; According to the formula W av =(W A +W B +W c ) / 3, using the accumulated load, calculate the average value of the three-phase load of the tower, and respectively according to the formula ΔW A =W A -W av , ΔW B =W B -W av , ΔW C =W C -W av Calculate the load that needs to be adjusted for each phase of the three-phase load of the tower, where a positive value of ΔW represents the load that needs to be adjusted out, and a negative value of ΔW represents the load that needs to be adjusted in, and level the three-phase load of the tower according to the load that needs to be adjusted for each phase, so that the load of the tower is balanced; When the load of the tower is balanced, the load is gradually extended upward to the branch lines so that the load of the branch lines is balanced; When the load of the branch line reaches a balance, it is gradually included in the trunk line to balance the load of the trunk line; When the trunk line load reaches a balance, it is gradually included in the substation area to balance the load of the substation area.

4. The method according to claim 3, characterized in that After determining the unchanged cumulative load and the load to be adjusted corresponding to the tower, the method further includes: When the load corresponding to any user among the loads to be adjusted exceeds 20% of the total load of the substation, the user load is checked to obtain the total load capacity corresponding to the user, and the total load capacity is evenly divided into phases A, B, and C to balance the load corresponding to the user.

5. The method according to claim 3, characterized in that: Before leveling the tower load based on the unchanged accumulated load and the load to be adjusted, the method further includes: The constant cumulative load and the load to be adjusted are added together, and according to the calculation result, the following load imbalance calculation formula is used to calculate the initial imbalance index f c ; Among them, W max is the maximum phase load, W min is the minimum phase load; Move any load to be adjusted leftward and rightward respectively, and calculate two new unbalance indexes f after moving leftward and rightward. li and f ri , until all loads to be adjusted n are adjusted, and 2n unbalance indexes are obtained, from which the minimum unbalance index f is selected u With the initial imbalance index f c If the former is smaller, the initial imbalance index f c Updated to the minimum imbalance index f u , record the execution of the minimum imbalance index f u Corresponding to the user's adjustment plan, and continue to iterate, otherwise output the initial imbalance index f c and phase modulation schemes for all users.

6. The method according to claim 1, characterized in that The step of leveling the photovoltaic access according to the photovoltaic access balancing strategy so as to achieve a balance for the photovoltaic access includes: Determine whether the photovoltaic access is single-phase photovoltaic or three-phase photovoltaic; If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit, so that the photovoltaic of the branch circuit is balanced; If it is the three-phase photovoltaic, directly connect the three-phase photovoltaic to the access capacity of each phase sequence in the branch circuit; When the photovoltaic power of the branch line reaches balance, the terminal reverse balancing method is used to gradually cover the trunk line and the substation for leveling, so that the photovoltaic power of the trunk line and the substation reach balance.

7. The method according to claim 6, characterized in that If it is the single-phase photovoltaic, the access capacity of the single-phase photovoltaic is evenly distributed to the access capacity of each phase sequence in the branch circuit to make the photovoltaic of the branch circuit reach balance, including: When the single-phase photovoltaic includes multiple, calculate the access capacity of each single-phase photovoltaic, and add up each of the access capacities to obtain the total photovoltaic access capacity; The total photovoltaic access capacity is evenly divided into the access capacity of each phase sequence in the branch line.

8. A device for photovoltaic access scheme in a substation, characterized in that: The device comprises: Establishing a module for establishing a substation topology model; A first leveling module is used to establish a power load balancing strategy based on the substation topology model, and level the power load according to the power load balancing strategy to balance the power load; The second leveling module is used to establish a photovoltaic access balancing strategy and level the photovoltaic access according to the photovoltaic access balancing strategy so that the photovoltaic access reaches a balance.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

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