Method and device for reducing active network loss in high-proportion new energy power system

Abstract

The present invention discloses a method for reducing active network loss of a high-proportion new energy power system, comprising: obtaining the active network loss change of the system after line k-m is disconnected; determining the primary line disconnection scheme according to the active network loss change; determining a first performance index of the line disconnection scheme quality for reducing the active network loss of the system; obtaining the first line disconnection scheme according to the first performance index; determining the second performance index of the system after line k-m is disconnected, obtaining the line disconnection scheme that meets the second performance index in the first line disconnection scheme according to the second performance index, and using the line disconnection scheme as the second line disconnection scheme; according to the second line disconnection scheme, reducing the active network loss of a high-proportion new energy power system by optimizing the power grid topology. The method solves the problem that the calculation efficiency and calculation accuracy cannot be taken into account in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a method, device and electronic equipment for reducing active network losses in a high-proportion renewable energy power system. Background Art

[0002] Network loss is one of the important indicators for measuring the economic efficiency of power system operation. The current mainstream network loss optimization strategies include two categories: node injection power method based on generator output adjustment and rescheduling, reactive power compensation, and grid topology reconstruction method based on reconstruction of distribution network and installation of FACTS on the transmission side. In the process of solving the problem of actively adjusting the power flow distribution in the network by adjusting the node injection power, there are many control variables that need to be adjusted, and the solution efficiency is relatively low. Summary of the invention

[0003] To solve the above problems, the present application provides a method for reducing active network loss in a high-proportion new energy power system, comprising:

[0004] Obtain the active network loss change of the system after the line km is disconnected; and use the disconnected line corresponding to the active network loss change less than the preset threshold value among the active network loss changes as the primary line disconnection plan;

[0005] Determine a first performance indicator of the quality of a line breaking scheme for reducing active network loss of the system; obtain a line breaking scheme that meets the first performance indicator in the primary line breaking scheme according to the first performance indicator, and use the line breaking scheme as the first line breaking scheme;

[0006] Determine a second performance indicator of the system after the line km is disconnected, obtain a line disconnection plan that meets the second performance indicator in the first line disconnection plan according to the second performance indicator, and use the line disconnection plan as the second line disconnection plan;

[0007] According to the second line disconnection plan, the active network loss of the high-proportion new energy power system is reduced by optimizing the grid topology.

[0008] Preferably, obtaining the change in active network loss of the system after the line km is disconnected includes:

[0009] After the line km is disconnected, the change in active power loss on the line ij is ΔP ij-loss ,

[0010] ΔP ij-loss =P' ij-loss -P ij-loss

[0011] Among them, P ij-loss is the active power loss on line ij when the system is operating normally; P'ij-loss is the active power loss P' on line ij after line km is disconnected ij-loss ;

[0012] According to the active power loss value change ΔP ij-loss and the active power loss P on the line km when the system is operating normally km-loss , determine the change in active network loss ΔP of the system after the line km is disconnected loss-km ,

[0013]

[0014] Where P km-loss It is the active power loss on line km when the system is operating normally.

[0015] Preferably, P' ij-loss and P' ij-loss By the following formula,

[0016]

[0017] In the formula, G ij , B ij are the real and imaginary parts of the line ij admittance respectively; V i 、V j are the voltages of nodes i and j when the system is operating normally; θ ij is the voltage phase difference of line ij; ΔV i , ΔV j are the voltage changes at nodes i and j after line km is disconnected; Δθ ij It is the change in voltage phase angle difference at ij after line km is disconnected.

[0018] Preferably, the disconnected line corresponding to the active network loss variation less than a preset threshold value among the active network loss variation is used as the primary line disconnection scheme, including:

[0019] Defining preset thresholds is a real number;

[0020] The active network loss change The disconnected line corresponding to the change in active network loss is used as the primary line disconnection plan.

[0021] Preferably, determining a first performance indicator of the quality of a line disconnection scheme for reducing active network loss of the system includes:

[0022] Determine the first performance indicator β of the quality of the line disconnection scheme for reducing the system active network loss,

[0023] β=κ 1 (P loss-base-P loss-post ) 1 -κ 2 mx 2

[0024] Where P loss-post is the system active network loss value after the line km is disconnected; P loss-base is the system active network loss value before the line km is disconnected; 1 is the unit active network loss cost; 2 is the cost of a single line breaking operation; m is the number of lines broken; κ 1 , κ 2 is the weight coefficient, and κ 1 +κ 2 =1.

[0025] Preferably, determining the second performance index of the system after the system runs for a preset time when the line km is disconnected includes:

[0026] Determine the second performance index δ for the system after line km is disconnected,

[0027] δ=κ 1 (P loss-1 -P loss-2 ) 1 -κ 2 mx 2

[0028] Where P loss-1 It is the active network loss value after the system runs for a preset time when the line km is disconnected; P loss-2 It is the original active network loss value of the system after the line km is disconnected.

[0029] The present application also provides a device for reducing active network loss in a high-proportion new energy power system, including:

[0030] The primary line disconnection plan determination unit is used to obtain the active network loss change of the system after the line km is disconnected; the disconnected line corresponding to the active network loss change less than the preset threshold value among the active network loss changes is used as the primary line disconnection plan;

[0031] A first line breaking scheme determining unit, configured to determine a first performance indicator of the quality of a line breaking scheme for reducing active network loss of a system; according to the first performance indicator, obtaining a line breaking scheme that satisfies the first performance indicator in the primary line breaking scheme, and using the line breaking scheme as the first line breaking scheme;

[0032] The second line breaking plan determination unit is used to determine the second performance indicator of the system after the system runs for a preset time in the case of line km breaking, and according to the second performance indicator, obtain the line breaking plan that meets the second performance indicator in the first line breaking plan, and use the line breaking plan as the second line breaking plan.

[0033] The optimization unit is used to reduce the active network loss of the high-proportion new energy power system by optimizing the power grid topology structure according to the second line disconnection plan.

[0034] The present application also provides an electronic device, the electronic device comprising:

[0035] processor;

[0036] a memory for storing instructions executable by the processor;

[0037] The processor is used to read the executable instructions from the memory and execute the instructions to implement any of the above methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of a method for reducing active network loss of a high-proportion new energy power system provided by the present application;

[0039] Figure 2 It is a flow chart for solving the line disconnection scheme involved in this application;

[0040] Figure 3 This is a comparison chart of the effect of reducing active network loss in the current system after the single line solution involved in this application is applied;

[0041] Figure 4 This is a comparison chart of the effect of reducing active network loss in the current system after applying multiple line solutions involved in this application;

[0042] Figure 5 It is a schematic diagram of a device provided by the present application for reducing active network loss of a high-proportion renewable energy power system;

[0043] Figure 6 It is an electronic device involved in this application. DETAILED DESCRIPTION

[0044] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0045] Figure 1This is a flow chart of a method for reducing active network loss in a high-proportion renewable energy power system provided by the present application. Figure 1 The method provided in this application is described in detail.

[0046] Step S101, obtaining the change in active network loss of the system after the line km is disconnected; taking the disconnected line corresponding to the active network loss change less than a preset threshold among the active network loss changes as the primary line disconnection plan.

[0047] In view of the problem of active network loss in the operation of a high-proportion renewable energy power system, the present invention proposes a method for reducing the active network loss of a high-proportion renewable energy power system by combining a linear method with a nonlinear method, taking into account factors such as response speed, operation convenience, and economy.

[0048] The method is characterized in that it combines linear methods with nonlinear methods, and mainly includes three stages: screening, detailed analysis, and scheme quality evaluation. In the screening stage, the change index of the total active network loss of the system caused by the line km disconnection is defined, and a non-zero real number threshold is set to improve the screening speed and quality, and the primary line disconnection scheme is evaluated; in the detailed analysis stage, the first performance index for reducing the active network loss of the system is defined, and the first line disconnection scheme is evaluated based on the index; in the scheme quality evaluation stage, the second performance index is defined, and the first line disconnection scheme that meets the second performance index is used as the second line disconnection scheme.

[0049] Specifically, in the screening stage, it is determined that after the line km is disconnected, the change in the active power loss value on the line ij is ΔP ij-loss ,

[0050] ΔP ij-loss =P' ij-loss -P ij-loss

[0051] Among them, P ij-loss is the active power loss on line ij when the system is operating normally; P' ij-loss is the active power loss P' on line ij after line km is disconnected ij-loss ;

[0052] According to the active power loss value change ΔP ij-loss and the active power loss P on the line km when the system is operating normally km-loss , determine the change in active network loss ΔP of the system after the line km is disconnected loss-km ,

[0053]

[0054] Where P km-lossIt is the active power loss on line km when the system is operating normally.

[0055] P' ij-loss and P' ij-loss By the following formula,

[0056]

[0057] In the formula, G ij , B ij are the real and imaginary parts of the line ij admittance respectively; V i 、V j are the voltages of nodes i and j when the system is operating normally; θ ij is the voltage phase difference of line ij; ΔV i , ΔV j are the voltage changes at nodes i and j after line km is disconnected; Δθ ij It is the change in voltage phase angle difference at ij after line km is disconnected.

[0058] To improve screening speed and quality, define preset thresholds is a real number;

[0059] The active network loss change The disconnected line corresponding to the change in active network loss is used as the primary line disconnection plan.

[0060] Step S102, determining a first performance indicator of the quality of a line breaking scheme for reducing system active network loss; according to the first performance indicator, obtaining a line breaking scheme in the primary line breaking scheme that meets the first performance indicator, and using the line breaking scheme as the first line breaking scheme.

[0061] In the detailed analysis phase, the first performance indicator β of the quality of the line disconnection scheme for reducing the system active network loss is determined.

[0062] β=κ 1 (P loss-base -P loss-post ) 1 -κ 2 mx 2

[0063] Where P loss-post is the system active network loss value after the line km is disconnected; P loss-base is the system active network loss value before the line km is disconnected; 1 is the unit active network loss cost; 2 is the cost of a single line breaking operation; m is the number of lines broken; κ 1 , κ 2 is the weight coefficient, and κ1 +κ 2 =1.

[0064] According to the first performance indicator, a line breaking scheme that meets the first performance indicator in the primary line breaking scheme is obtained, and the line breaking scheme is used as the first line breaking scheme.

[0065] Step S103, determine a second performance indicator of the system after a preset time for line km disconnection, and according to the second performance indicator, obtain a line disconnection plan that meets the second performance indicator in the first line disconnection plan, and use the line disconnection plan as the second line disconnection plan.

[0066] In the scheme quality evaluation stage, after obtaining the first line disconnection scheme, the operating conditions and active network loss conditions of the system after 60 minutes of operation after the first line disconnection scheme is applied are evaluated based on the Newton-Raphson method, and the second performance index δ of the system after the system runs for a preset time when the line km is disconnected is determined. δ is the performance index of the system when the line km is disconnected and the system runs for 60 minutes, which can be described as

[0067] δ=κ 1 (P loss-1 -P loss-2 ) 1 -κ 2 mx 2

[0068] Where P loss-1 It is the active network loss value after the system runs for a preset time when the line km is disconnected; P loss-2 It is the original active network loss value after the line km is disconnected.

[0069] According to the second performance indicator, a line disconnection scheme that meets the second performance indicator in the first line disconnection scheme is obtained, and the line disconnection scheme is used as a second line disconnection scheme,

[0070] Step S104: According to the second line disconnection plan, the active network loss of the high-proportion new energy power system is reduced by optimizing the power grid topology.

[0071] Based on δ, a group of high-quality line disconnection schemes, namely the second line disconnection scheme, are evaluated to optimize the grid topology to reduce the active network loss of the system. This solves the problem that the calculation efficiency and calculation accuracy cannot be taken into account in the existing related technologies. This method has small calculation amount, high accuracy and strong applicability, and can be widely used in actual power grids to solve related problems.

[0072] The specific application examples are as follows:

[0073] Taking the IEEE 300-node system as an example, the system has 69 generators, 300 nodes and 411 branches, with a total load of 23525.8MW and a total active output of 32678.4MW. Based on the Newton-Raphson method, the active network loss of the base state system is 408.31MW. For ease of analysis, the variable is set as: 1 =20$, χ 2 =5$,κ 1 =0.8,κ 2 =0.2. In actual operation, it can be calculated and analyzed according to the actual price and actual demand.

[0074] (1) Application scenario 1: Single line disconnection reduces system active network loss

[0075] Based on the method for reducing active network loss of a high-proportion new energy power system provided by this application, according to Figure 2 The solution process shown in the figure gives a set of single line disconnection schemes that can effectively reduce the active network loss of the system. The calculation results of each stage are shown in Tables 1, 2 and Figure 3 shown.

[0076] Table 1 Screening results of reducing system active network loss by disconnecting a single line

[0077]

[0078]

[0079] Table 2 Detailed analysis of reducing system active network loss by disconnecting a single line and results of scheme quality assessment

[0080]

[0081] From Tables 1, 2 and Figure 3 It can be seen that the method of the present application provides a set of single-line disconnection schemes that can effectively reduce the active network loss of the current system, namely, the first line disconnection scheme. After the first line disconnection scheme is applied, when the system runs for 60 minutes, it is found that the disconnection of line 8-14 will cause excessive network loss again. Therefore, the line 8-14 disconnection scheme is abandoned in the second line disconnection scheme, avoiding subsequent repeated adjustments and improving the quality of the solution.

[0082] (2) Application scenario 2: Multiple lines disconnected to reduce system active network loss

[0083] Set the number of line disconnections m=2. Based on the method for reducing the active network loss of a high-proportion new energy power system provided by the present application, Figure 2 The solution process shown in the figure gives a set of solutions for simultaneously disconnecting multiple lines that can effectively reduce the active network loss of the system. The calculation results of each stage are shown in Table 3 and Figure 4shown.

[0084] Table 3 Analysis and evaluation results of reducing system active network loss by disconnecting multiple lines

[0085]

[0086]

[0087] From Table 3 and Figure 4 It can be seen that the method of the present application provides a set of single-line disconnection schemes that can effectively reduce the active network loss of the current system, namely, the first line disconnection scheme. After the first line disconnection scheme is applied, when the system runs for 60 minutes, it is found that after the disconnection of lines 14-15 and 57-58, and lines 14-15 and 58-59, the original active network loss value of the system under the new load level after the scheme is applied is greatly increased. Therefore, these two schemes need to be abandoned, and finally the second line disconnection scheme is evaluated according to the second performance indicator of formula (6).

[0088] Based on the same inventive concept, the present application provides a device 500 for reducing active network loss in a high-proportion renewable energy power system, such as Figure 5 As shown, including:

[0089] The primary line disconnection scheme determination unit 510 is used to obtain the active network loss change of the system after the line km is disconnected; and the disconnected line corresponding to the active network loss change less than the preset threshold value among the active network loss changes is used as the primary line disconnection scheme;

[0090] A first line breaking scheme determining unit 520 is configured to determine a first performance indicator of the quality of a line breaking scheme for reducing active network loss of the system; based on the first performance indicator, obtain a line breaking scheme that satisfies the first performance indicator in the primary line breaking scheme, and use the line breaking scheme as the first line breaking scheme;

[0091] The second line breaking plan determination unit 530 is used to determine a second performance indicator of the system after the line km is broken for a preset time, and according to the second performance indicator, obtain a line breaking plan that meets the second performance indicator in the first line breaking plan, and use the line breaking plan as the second line breaking plan.

[0092] The optimization unit 540 is used to reduce the active network loss of the high-proportion new energy power system by optimizing the power grid topology structure according to the second line disconnection plan.

[0093] Figure 6 1 shows a block diagram of an electronic device according to an embodiment of the present disclosure. Figure 6 As shown, the electronic device includes one or more processors 61 and a memory 62 .

[0094] The processor 61 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0095] The memory 62 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 81 may run the program instructions to implement the method for information mining of historical change records and / or other desired functions of the software program of each embodiment of the present disclosure described above. In one example, the electronic device may also include: an input device 83 and an output device 84, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0096] In addition, the input device 63 may also include, for example, a keyboard, a mouse, etc.

[0097] The output device 64 can output various information to the outside. The output device 64 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0098] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for reducing active network loss in a high-proportion renewable energy power system, It is characterized in that include: Get the change in active network loss of the system after the line km is disconnected; The disconnected lines corresponding to the active network loss changes that are less than a preset threshold value among the active network loss changes are used as the primary line disconnection plan; Determine the first performance indicator of the quality of the line disconnection scheme for reducing the active network loss of the system; According to the first performance indicator, obtaining a line breaking scheme that meets the first performance indicator in the primary line breaking scheme, and using the line breaking scheme as the first line breaking scheme; Determine a second performance indicator of the system after the line km is disconnected, obtain a line disconnection plan that meets the second performance indicator in the first line disconnection plan according to the second performance indicator, and use the line disconnection plan as the second line disconnection plan; According to the second line disconnection plan, the active network loss of the high-proportion new energy power system is reduced by optimizing the power grid topology structure; The first performance indicator for determining the quality of the line disconnection scheme for reducing the system active network loss includes: Determine the first performance indicator β of the quality of the line disconnection scheme for reducing the system active network loss, β=κ 1 (P loss-base -P loss-post )x 1 -k 2 mx 2 Where P loss-post is the system active network loss value after the line km is disconnected; P loss-base is the system active network loss value before the line km is disconnected; 1 is the unit active network loss cost; 2 is the cost of a single line breaking operation; m is the number of lines broken; κ 1 , κ 2 is the weight coefficient, and κ 1 +κ 2 =1; Determine the second performance index of the system after the system runs for a preset time when the line km is disconnected, including: Determine the second performance index δ for the system after line km is disconnected, d=k 1 (P loss-1 -P loss-2 )x 1 -k 2 mx 2 Where P loss-1 It is the active network loss value after the system runs for a preset time when the line km is disconnected; P loss-2 It is the original active network loss value of the system after the line km is disconnected.

2. The method according to claim 1, It is characterized in that Obtain the change in active network loss of the system after the line km is disconnected, including: After the line km is disconnected, the change in active power loss on the line ij is ΔP ij-loss , ΔP ij-loss =P' ij-loss -P ij-loss Among them, P ij-loss is the active power loss on line ij when the system is operating normally; P' ij-loss is the active power loss P' on line ij after line km is disconnected ij-loss ; According to the active power loss value change ΔP ij-loss and the active power loss P on the line km when the system is operating normally km-loss , determine the change in active network loss ΔP of the system after the line km is disconnected loss-km , Where P km-loss It is the active power loss on line km when the system is operating normally.

3. The method according to claim 2, It is characterized in that P' ij-loss and P' ij-loss By the following formula, In the formula, G ij , B ij are the real and imaginary parts of the line ij admittance respectively; V i 、V j are the voltages of nodes i and j when the system is operating normally; θ ij is the voltage phase angle difference of line ij; ΔV i , ΔV j are the voltage changes at nodes i and j after line km is disconnected; Δθ ij It is the change in voltage phase angle difference at ij after line km is disconnected.

4. The method according to claim 1, It is characterized in that The disconnected line corresponding to the active network loss variation less than the preset threshold value among the active network loss variation is used as the primary line disconnection scheme, including: Defining preset thresholds is a real number; The active network loss change The disconnected line corresponding to the change in active network loss is used as the primary line disconnection plan.

5. A device for reducing active network loss in a high-proportion renewable energy power system, It is characterized in that include: The primary line disconnection plan determination unit is used to obtain the change in active network loss of the system after the line km is disconnected; The disconnected lines corresponding to the active network loss changes that are less than a preset threshold value among the active network loss changes are used as the primary line disconnection plan; A first line disconnection plan determination unit, used to determine a first performance indicator of the quality of a line disconnection plan for reducing active network loss of the system; According to the first performance indicator, obtaining a line breaking scheme that meets the first performance indicator in the primary line breaking scheme, and using the line breaking scheme as the first line breaking scheme; A second line breaking scheme determining unit, configured to determine a second performance indicator of the system after the system runs for a preset time in the case of line km breaking, and obtain a line breaking scheme that meets the second performance indicator in the first line breaking scheme according to the second performance indicator, and use the line breaking scheme as the second line breaking scheme; an optimization unit, configured to reduce active network loss of a high-proportion new energy power system by optimizing a power grid topology structure according to the second line disconnection plan; The first performance indicator for determining the quality of the line disconnection scheme for reducing the system active network loss includes: Determine the first performance indicator β of the quality of the line disconnection scheme for reducing the system active network loss, β=κ 1 (P loss-base -P loss-post )x 1 -k 2 mx 2 Where P loss-post is the system active network loss value after the line km is disconnected; P loss-base is the system active network loss value before the line km is disconnected; 1 is the unit active network loss cost; 2 is the cost of a single line breaking operation; m is the number of lines broken; κ 1 , κ 2 is the weight coefficient, and κ 1 +κ 2 =1; Determine the second performance index of the system after the system runs for a preset time when the line km is disconnected, including: Determine the second performance index δ for the system after line km is disconnected, d=k 1 (P loss-1 -P loss-2 )x 1 -k 2 mx 2 Where P loss-1 It is the active network loss value after the system runs for a preset time when the line km is disconnected; P loss-2 It is the original active network loss value of the system after the line km is disconnected.

6. An electronic device, It is characterized in that The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 4.

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