A method and device for generating a power flow convergence section of a regional power grid

Abstract

The application relates to a regional power grid power flow convergence section generation method and device, which comprises the following steps: correcting power data of each load and power data of each adjustable generator set in a regional power grid by using historical power data of each load in the regional power grid; performing power flow calculation on the regional power grid to obtain a power flow convergence section of the regional power grid at the current time; and the historical power data of each load in the regional power grid is used to correct the power data of each load and the power data of each adjustable generator set, so that a more accurate power flow convergence section is obtained, and loss of power dispatching is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power automation, in particular to a regional power grid power flow convergence section generation method and device. BACKGROUND

[0002] The section in the power grid refers to the tie line family formed by connecting multiple branches between two regions, and the power flow section is the sum of the power flow of each branch forming the section, which clearly reflects the power exchange relationship between the two regions connected by the section. Monitoring, analyzing and controlling the power flow of the section can ensure that a single branch meets the thermal stability limit and ensures regional voltage stability and system transient stability, and ultimately ensures the safety of the entire power grid.

[0003] The load of the regional power grid, the number and distribution of generator units need to be adjusted according to the power demand of the power users. Therefore, when obtaining the convergence section by performing power flow calculation on the regional power grid, if the historical power data of the load and the generator unit are directly used as the power data for power flow calculation, the power flow calculation result will be inaccurate, and even a large error will occur, causing loss to power dispatching.

[0004] Therefore, when the load of the regional power grid, the number and distribution of generator units are adjusted, a new power flow convergence section generation method is needed to generate a more accurate power flow convergence section file to avoid loss to power dispatching. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is a regional power grid power flow convergence section generation method and device, which corrects the power data of each load and the power data of each adjustable generator unit by using the historical power data of each load in the regional power grid, to obtain a more accurate power flow convergence section, thereby avoiding loss to power dispatching.

[0006] The purpose of the present application is achieved by using the following technical solutions:

[0007] The present application provides a regional power grid power flow convergence section generation method, which is improved in that the method comprises:

[0008] The historical power data of each load in the regional power grid is used to correct the power data of each load and the power data of each adjustable generator unit in the regional power grid at the current time;

[0009] The regional power grid is subjected to power flow calculation to obtain the power flow convergence section of the regional power grid at the current time.

[0010] Preferably, the historical power data of each load in the regional power grid is used to correct the power data of each load and the power data of each adjustable generator unit in the regional power grid at the current time, comprising:

[0011] Determine the power correction value of each load in the regional power grid at the current time by using the historical power data of each load in the regional power grid.

[0012] Correct the power data of each load and the power data of each adjustable generator in the regional power grid at the current time by using the power correction value of each load in the regional power grid at the current time.

[0013] Further, the determination of the power correction value of each load in the regional power grid at the current time by using the historical power data of each load in the regional power grid comprises:

[0014] Determine the power correction value ΔP of the i-th load in the regional power grid at the current time t according to the following formula: i,t

[0015] ΔP i,t = P i,t-1 - P i_object,t-1

[0016] In the formula, P i,t-1 is the actual power of the i-th load in the regional power grid at the previous time t-1, and P i_object,t-1 is the preset target power of the i-th load in the regional power grid at the previous time t-1.

[0017] Further, the correction of the power data of each load and the power data of each adjustable generator in the regional power grid at the current time by using the power correction value of each load in the regional power grid at the current time comprises:

[0018] Determine the corrected power P of the i-th load in the regional power grid at the current time t according to the following formula: i,t

[0019] P i,t = P i_object,t + ΔP i,t

[0020] In the formula, i ∈ [1, N], N is the total number of loads in the regional power grid, P i_object,t is the preset target power of the i-th load in the regional power grid at the current time t;

[0021] Correct the power data of each adjustable generator in the regional power grid at the current time by using the power correction value of each load in the regional power grid at the current time.

[0022] Further, the correction of the power data of each adjustable generator in the regional power grid at the current time by using the power correction value of each load in the regional power grid at the current time comprises:

[0023] Determine the power correction value ΔP of the j-th adjustable generator in the regional power grid at the current time t according to the following formula: j,t ​​​

[0024]

[0025] In the formula, j ∈ [1, M], M is the total number of adjustable generator groups in the regional power grid, S j is the unit capacity of the jth adjustable generator group in the regional power grid at the current time t;

[0026] The corrected power P' of the jth adjustable generator group in the regional power grid at the current time t is determined according to the following formula j,t :

[0027] P' j,t = P j,t + ΔP j,t

[0028] In the formula, P j,t is the actual power of the jth adjustable generator group in the regional power grid at the current time t.

[0029] Based on the same inventive concept, the application also provides a device for generating a power flow convergence section of a regional power grid, which is improved in that the device comprises:

[0030] A correction module is configured to correct power data of each load and power data of each adjustable generator group in the regional power grid at the current time by using historical power data of each load in the regional power grid;

[0031] A generation module is configured to perform power flow calculation on the regional power grid to obtain a power flow convergence section of the regional power grid at the current time.

[0032] Preferably, the correction module comprises:

[0033] A determination unit is configured to determine power correction values of each load in the regional power grid at the current time by using historical power data of each load in the regional power grid;

[0034] A correction unit is configured to correct power data of each load and power data of each adjustable generator group in the regional power grid at the current time by using the power correction values of each load in the regional power grid at the current time.

[0035] Further, the determination unit is specifically configured to:

[0036] determine the power correction value ΔP i,t of the ith load in the regional power grid at the current time t according to the following formula:

[0037] ΔP i,t = P i,t-1 - P i_object,t-1

[0038] In the formula, P i,t-1 is the actual power of the ith load in the regional power grid at the previous time t-1, and Pi_object,t-1 is the preset target power of the i-th load in the regional power grid at the previous time t-1.

[0039] Further, the correction unit is specifically used for:

[0040] The correction power P of the i-th load in the regional power grid at the current time t is determined according to the following formula: i,t

[0041] P i,t = P i_object,t + ΔP i,t

[0042] In the formula, i ∈ [1, N], N is the total number of loads in the regional power grid, P i_object,t is the preset target power of the i-th load in the regional power grid at the current time t;

[0043] The power data of each adjustable generator set in the regional power grid at the current time is corrected by using the power correction value of each load in the regional power grid at the current time.

[0044] Further, the power data of each adjustable generator set in the regional power grid at the current time is corrected by using the power correction value of each load in the regional power grid at the current time, including:

[0045] The power correction value ΔP of the j-th adjustable generator set in the regional power grid at the current time t is determined according to the following formula: j,t

[0046]

[0047] In the formula, j ∈ [1, M], M is the total number of adjustable generator sets in the regional power grid, S j is the unit capacity of the j-th adjustable generator set in the regional power grid;

[0048] The correction power P' of the j-th adjustable generator set in the regional power grid at the current time t is determined according to the following formula: j,t

[0049] P' = P j,t + ΔP j,t j,t

[0050] In the formula, P j,t is the actual power of the j-th adjustable generator set in the regional power grid at the current time t.

[0051] Compared with the closest prior art, the present application has the beneficial effects of:

[0052] ​​​​The application provides a regional power grid power flow convergence section generation method and device, historical power data of each load in a regional power grid is used to respectively correct power data of each load and power data of each adjustable generator set in the regional power grid at a current time; power flow calculation is performed on the regional power grid to obtain a power flow convergence section of the regional power grid at the current time; the application corrects the power data of each load and the power data of each adjustable generator set by using the historical power data of each load in the regional power grid, so that a more accurate power flow convergence section is obtained, and loss of power dispatching is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a flow chart of the regional power grid power flow convergence section generation method of the application;

[0054] Figure 2 is a schematic diagram of the regional power grid power flow convergence section generation device of the application. DETAILED DESCRIPTION

[0055] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0056] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings of the embodiments of the application. Obviously, the described embodiments are some but not all of the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0057] The application provides a regional power grid power flow convergence section generation method, as shown in Figure 1 The method comprises the following steps.

[0058] The historical power data of each load in a regional power grid is used to respectively correct power data of each load and power data of each adjustable generator set in the regional power grid at a current time.

[0059] Power flow calculation is performed on the regional power grid to obtain a power flow convergence section of the regional power grid at the current time.

[0060] In the embodiments of the application, the historical power data of each load in a regional power grid is used to respectively correct power data of each load and power data of each adjustable generator set in the regional power grid at a current time, which comprises:

[0061] The historical power data of each load in a regional power grid is used to determine a power correction value of each load in the regional power grid at a current time.

[0062] The power correction value of each load in the current time zone is used to correct the power data of each load and the power data of each adjustable generator in the current time zone.

[0063] Further, the power correction value of each load in the current time zone is determined by using the historical power data of each load in the regional power grid, and the power correction value of each load in the current time zone is determined by using the historical power data of each load in the regional power grid.

[0064] The power correction value of the i th load in the regional power grid at the current time t is determined by the following formula: i,t

[0065] The power correction value of the i th load in the regional power grid at the current time t is determined by the following formula: i,t i,t-1 i_object,t-1

[0066] In the formula, P i,t-1 is the actual power of the i th load in the regional power grid at the previous time t-1, and P i_object,t-1 is the preset target power of the i th load in the regional power grid at the previous time t-1. The preset target power is the power value in the target power curve fitted by the dispatching system in advance.

[0067] In a specific embodiment, if the time t is the initial time of continuous time, the actual power P i,t-1 of the i th load in the regional power grid at the previous time t-1 is the actual power at the time t, otherwise it is the corrected power at the previous time.

[0068] Further, the power correction value of each load in the current time zone is used to correct the power data of each load and the power data of each adjustable generator in the current time zone.

[0069] The corrected power P i,t of the i th load in the regional power grid at the current time t is determined by the following formula:

[0070] The corrected power P i,t of the i th load in the regional power grid at the current time t is determined by the following formula: i_object,t i,t

[0071] In the formula, i∈[1,N], N is the total number of loads in the regional power grid, P i_object,t is the preset target power of the i th load in the regional power grid at the current time t;

[0072] The power correction value of each load in the current time zone is used to correct the power data of each load and the power data of each adjustable generator in the current time zone.

[0073] Further, the power correction value of each load in the current time zone is used to correct the power data of each load and the power data of each adjustable generator in the current time zone. ​​​​

[0074] The power correction value ΔP of the jth adjustable generator set in the regional power grid at the current time t is determined according to the following formula j,t :

[0075]

[0076] In the formula, j ∈ [1, M], M is the total number of adjustable generator sets in the regional power grid, S j is the unit capacity of the jth adjustable generator set in the regional power grid;

[0077] The corrected power P' of the jth adjustable generator set in the regional power grid at the current time t is determined according to the following formula j,t :

[0078] P' j,t = P j,t + ΔP j,t

[0079] In the formula, P j,t is the actual power of the jth adjustable generator set in the regional power grid at the current time t.

[0080] Based on the same inventive concept, the present application also provides a regional power grid power flow convergence section generation device, as shown in the accompanying drawings, the device comprises: Figure 2

[0081] A correction module is configured to correct the power data of each load and the power data of each adjustable generator set in the regional power grid at the current time by using the historical power data of each load in the regional power grid;

[0082] A generation module is configured to perform power flow calculation on the regional power grid to obtain the power flow convergence section of the regional power grid at the current time.

[0083] Preferably, the correction module comprises:

[0084] A determination unit is configured to determine the power correction value of each load in the regional power grid at the current time by using the historical power data of each load in the regional power grid;

[0085] A correction unit is configured to correct the power data of each load and the power data of each adjustable generator set in the regional power grid at the current time by using the power correction value of each load in the regional power grid at the current time.

[0086] Further, the determination unit is specifically configured to:

[0087] The power correction value ΔP of the ith load in the regional power grid at the current time t is determined according to the following formula i,t :

[0088] ΔP i,t = P i,t-1 - P​i_object,t-1

[0089] In the formula, P i,t-1 Let P be the actual power of the i-th load in the regional power grid at the previous time t-1. i_object,t-1 The preset target power is the power of the i-th load in the regional power grid at the previous time t-1.

[0090] Furthermore, the correction unit is specifically used for:

[0091] The corrected power P of the i-th load in the regional power grid at the current time t is determined by the following formula. i,t :

[0092] P i,t =P i_object,t +ΔP i,t

[0093] In the formula, i∈[1,N], N is the total load of the regional power grid, and P i_object,t The preset target power is the power of the i-th load in the power grid of region t at the current time t;

[0094] The power data of each adjustable generator unit in the regional power grid at the current time is corrected using the power correction values ​​of each load in the regional power grid at the current time.

[0095] Further, the step of correcting the power data of each adjustable generator unit in the regional power grid at the current time using the power correction value of each load in the regional power grid at the current time includes:

[0096] The power correction value ΔP of the j-th adjustable generator unit in the power grid at time t is determined by the following formula. j,t :

[0097]

[0098] In the formula, j∈[1,M], M is the total number of adjustable generator units in the regional power grid, and S j Let be the unit capacity of the j-th adjustable generator unit in the regional power grid;

[0099] The corrected power P′ of the j-th adjustable generator unit in the regional power grid at time t is determined by the following formula. j,t :

[0100] P′ j,t =P j,t +ΔP j,t

[0101] In the formula, P j,t This represents the actual power of the j-th adjustable generator unit within the power grid at time t.

[0102] In summary, the application provides a regional power grid power flow convergence section generation method and device, historical power data of each load in the regional power grid is used to respectively correct power data of each load and power data of each adjustable generator set in the regional power grid at the current time; power flow calculation is performed on the regional power grid to obtain a power flow convergence section of the regional power grid at the current time; the application corrects the power data of each load and the power data of each adjustable generator set by using the historical power data of each load in the regional power grid, so that a more accurate power flow convergence section is obtained, and loss of power dispatching is avoided.

[0103] Those skilled in the art will understand that embodiments of the application can be provided as methods, systems, or computer program products. Therefore, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0104] The application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce an apparatus that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks. Figure 1 The functions specified in a flow or multiple flows and / or blocks.

[0105] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks. Figure 1 The functions specified in a flow or multiple flows and / or blocks.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks. Figure 1steps of the functions specified in the one or more blocks.

[0107] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or equivalent replaced without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A method for generating a regional power flow convergence section, characterized in that, The method includes: The power data of each load and the power data of each adjustable generator unit in the regional power grid at the current moment are corrected by using the historical power data of each load in the regional power grid. Perform power flow calculations on the regional power grid to obtain the power flow convergence section of the regional power grid at the current moment; The method of using historical power data of each load within the regional power grid to correct the power data of each load and each adjustable generator unit within the regional power grid at the current moment includes: The power correction value of each load in the regional power grid at the current moment is determined by using historical power data of each load in the regional power grid. The power data of each load and the power data of each adjustable generator set in the regional power grid at the current time are corrected using the power correction values ​​of each load in the regional power grid at the current time. The process of determining the power correction value for each load in the regional power grid at the current moment using historical power data of each load in the regional power grid includes: The power correction value ΔP for the i-th load in the regional power grid at time t is determined by the following formula. i,t : ΔP i,t =P i,t-1 -P i_object,t-1 In the formula, P i,t-1 Let P be the actual power of the i-th load in the regional power grid at the previous time t-1. i_object,t-1 The preset target power is the power of the i-th load in the regional power grid at the previous time t-1. The step of correcting the power data of each load and the power data of each adjustable generator unit in the current regional power grid using the power correction value of each load in the current time includes: The corrected power P of the i-th load in the regional power grid at the current time t is determined by the following formula. i,t : P i,t =P i_object,t +ΔP i,t In the formula, i∈[1,N], N is the total load of the regional power grid, and P i_object,t The preset target power is the power of the i-th load in the power grid of region t at the current time t; The power data of each adjustable generator unit in the regional power grid at the current time is corrected using the power correction value of each load in the regional power grid at the current time; The step of correcting the power data of each adjustable generator unit in the regional power grid at the current time using the power correction value of each load in the regional power grid at the current time includes: The power correction value ΔP of the j-th adjustable generator unit in the power grid at time t is determined by the following formula. j,t : In the formula, j∈[1,M], M is the total number of adjustable generator units in the regional power grid, and S j Let be the unit capacity of the j-th adjustable generator unit in the regional power grid; The corrected power P' of the j-th adjustable generator unit in the regional power grid at time t is determined by the following formula. j,t : P' j,t =P j,t +ΔP j,t In the formula, P j,t This represents the actual power of the j-th adjustable generator unit within the power grid at time t.

2. A device for generating a regional power grid flow convergence section, characterized in that, The device includes: The correction module is used to correct the power data of each load and each adjustable generator set in the regional power grid at the current moment using the historical power data of each load in the regional power grid. The generation module is used to perform power flow calculation on the regional power grid and obtain the power flow convergence section of the regional power grid at the current moment. The correction module includes: The determination unit is used to determine the power correction value of each load in the regional power grid at the current moment using the historical power data of each load in the regional power grid; The correction unit is used to correct the power data of each load and the power data of each adjustable generator set in the regional power grid at the current time using the power correction value of each load in the regional power grid at the current time. The determining unit is specifically used for: The power correction value ΔP for the i-th load in the regional power grid at time t is determined by the following formula. i,t : ΔP i,t =P i,t-1 -P i_object,t-1 In the formula, P i,t-1 Let P be the actual power of the i-th load in the regional power grid at the previous time t-1. i_object,t-1 The preset target power is the power of the i-th load in the regional power grid at the previous time t-1. The correction unit is specifically used for: The corrected power P of the i-th load in the regional power grid at the current time t is determined by the following formula. i,t : P i,t =P i_object,t +ΔP i,t In the formula, i∈[1,N], N is the total load of the regional power grid, and P i_object,t The preset target power is the power of the i-th load in the power grid of region t at the current time t; The power data of each adjustable generator unit in the regional power grid at the current time is corrected using the power correction value of each load in the regional power grid at the current time; The step of correcting the power data of each adjustable generator unit in the regional power grid at the current time using the power correction value of each load in the regional power grid at the current time includes: The power correction value ΔP of the j-th adjustable generator unit in the power grid at time t is determined by the following formula. j,t : In the formula, j∈[1,M], M is the total number of adjustable generator units in the regional power grid, and S j Let be the unit capacity of the j-th adjustable generator unit in the regional power grid; The corrected power P' of the j-th adjustable generator unit in the regional power grid at time t is determined by the following formula. j,t : P' j,t =P j,t +ΔP j,t In the formula, P j,t This represents the actual power of the j-th adjustable generator unit within the power grid at time t.

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