User power distribution network energy saving determination method, device, system and computer medium

Abstract

The application discloses a user power distribution network energy-saving determination method, device and system and a computer medium, relates to the power grid field, and calculates a first total loss amount of total active power of a user power distribution network through a user power distribution network model; reactive power compensation is performed on the user power distribution network; a second total loss amount of total active power of the user power distribution network after the reactive power compensation is calculated; and the electric energy that can be saved by the user power distribution network is determined, so that the energy-saving potential of the user power distribution network is determined, the user power distribution network is optimized according to the saved electric energy by enterprises, the present situation of the development of the enterprises is better adapted, electric energy loss is reduced, and energy is saved.

Description

Technical Field

[0001] This invention relates to the field of power grids, and in particular to a method, apparatus, system, and computer medium for determining energy conservation in user distribution networks. Background Technology

[0002] With the rapid development of industrialization and automation, and the expansion of enterprise production scale, the electricity demand of enterprises for their daily production work is also gradually increasing. However, in today's society, the excessive consumption of fossil fuels and the increasingly serious problem of energy shortages make improving electricity utilization and saving electricity a hot topic.

[0003] The existing user distribution network of the enterprise may no longer be suitable for the enterprise's current situation as the enterprise develops, resulting in more power loss, damaging the enterprise's interests and wasting energy. Therefore, it is urgent to solve the problem of optimizing the enterprise's existing user distribution network and energy-saving methods. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, system, and computer medium for determining energy saving in a user distribution network; to determine the energy that can be saved in a user distribution network, which facilitates the determination of the energy-saving potential of the user distribution network, and enables enterprises to optimize the user distribution network based on the saved energy, making it more suitable for the current development of enterprises, reducing power loss, and saving energy.

[0005] To address the aforementioned technical problems, this invention provides a method for determining energy savings in a user distribution network, comprising:

[0006] Establish a user distribution network model;

[0007] The first total loss of active power in the user distribution network during the first preset time period is determined based on the user distribution network model.

[0008] Identify the nodes in the user distribution network model that will receive reactive power compensation and perform reactive power compensation on the nodes.

[0009] After reactive power compensation is performed on the node, the second total loss of active power in the user distribution network during the second preset time period is determined according to the user distribution network model, wherein the first preset time period and the second preset time period have the same duration.

[0010] The energy saved is determined based on the first total loss and the second total loss.

[0011] Preferably, determining the first total active power loss of the user distribution network in the first preset time period based on the user distribution network model includes:

[0012] The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the first preset time period.

[0013] The active power at the beginning and the active power at the end of all branches in the first preset time period are summed to obtain the first total loss of active power in the user distribution network in the first preset time period.

[0014] The second total active power loss of the user distribution network in the second preset time period is determined according to the user distribution network model, including:

[0015] The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the second preset time period.

[0016] The active power at the beginning and the active power at the end of all branches in the second preset time period are summed to obtain the second total loss of active power in the user distribution network in the second preset time period.

[0017] Preferably, determining the nodes for reactive power compensation in the user distribution network model includes:

[0018] Based on the user distribution network model, determine the adjustable space quantification index of each node in the user distribution network;

[0019] The adjustable space quantification index is:

[0020] ;

[0021] The adjustable space quantification index is used for the i-th node in the user distribution network model, which includes nodes and slack nodes;

[0022] The average reactive power of the i-th node during the first preset time period;

[0023] The reactive power compensation spatial weights range from 0 to 1;

[0024] For voltage regulation weights;

[0025] The average voltage of the balancing node during the first preset time period;

[0026] The average voltage of the i-th node during the first preset time period;

[0027] The node corresponding to the maximum value in the adjustable space quantification index is determined as the node for reactive power compensation.

[0028] Preferably, reactive power compensation is performed on the nodes receiving reactive power compensation, including:

[0029] Reactive power compensation is performed on the nodes subject to constraints.

[0030] The constraints are as follows:

[0031] ;

[0032] ;

[0033] First branch load rate threshold;

[0034] First transformer load rate threshold;

[0035] The compensation capacity of the reactive power compensation nodes in the user distribution network model. To compensate for the lower limit of capacity, To compensate for the upper limit of capacity;

[0036] Let be the real part of the voltage at the i-th node in the user distribution network model. Let be the imaginary part of the voltage at the i-th node in the user distribution network model. Let be the lower limit value of the voltage of the i-th node in the user distribution network model. This represents the upper limit of the voltage at the i-th node in the user distribution network model.

[0037] Let j be the line current of the j-th branch in the user distribution network model. Let j be the current carrying capacity of the j-th branch in the user distribution network model;

[0038] The active power on the high-voltage side of the z-th transformer in the user distribution network model;

[0039] The reactive power on the high-voltage side of the z-th transformer in the user distribution network model;

[0040] Let be the rated capacity of the z-th transformer in the user distribution network model.

[0041] Preferably, before determining the nodes for reactive power compensation in the user distribution network model and performing reactive power compensation on the nodes, the method further includes:

[0042] Based on the user distribution network model, determine the branch load rate and transformer load rate of each branch in the user distribution network.

[0043] Based on the branch load rate and / or the transformer load rate, determine whether to generate a user distribution network renovation decision;

[0044] If so, rebuild the user distribution network model based on the aforementioned user distribution network transformation decision;

[0045] If not, proceed to the step of determining the node for reactive power compensation in the user distribution network model and performing reactive power compensation on the node.

[0046] Preferably, determining whether to generate a user distribution network upgrade decision based on the branch load rate and / or the transformer load rate includes:

[0047] Determine whether there is a branch load rate greater than a first branch load rate threshold during the first preset time period, and / or whether there is a transformer load rate greater than a first transformer load rate threshold during the first preset time period;

[0048] If the branch load rate of a branch is greater than the first branch load rate threshold, a user distribution network transformation decision is generated. The user distribution network transformation decision is to replace the branch whose branch load rate is greater than the first branch load rate threshold, so that the load rate of the replaced branch is not greater than the second branch load rate threshold, and the second branch load rate threshold is not greater than the first branch load rate threshold.

[0049] And / or,

[0050] If the transformer load rate of a transformer is greater than the first transformer load rate threshold, a user distribution network transformation decision is generated. The user distribution network transformation decision is to replace the transformer whose transformer load rate is greater than the first transformer load rate threshold, so that the load rate of the replaced transformer is not greater than the second transformer load rate threshold, and the second transformer load rate threshold is not greater than the first transformer load rate threshold.

[0051] If no branch load rate of the specified branch is greater than the first branch load rate threshold and no transformer load rate of the specified transformer is greater than the first transformer load rate threshold, it is determined that no user distribution network modification decision will be generated.

[0052] Preferably, after determining the energy saved based on the first total loss and the second total loss, the method further includes:

[0053] The payback period for the investment is determined based on the energy savings mentioned above;

[0054] The investment payback period is:

[0055] ;

[0056] Cost of upgrading a branch road per unit length;

[0057] Cost of upgrading a transformer per unit capacity;

[0058] Cost per unit capacity reactive power compensator;

[0059] To modify the length of the branch road;

[0060] To upgrade the capacity of the transformer;

[0061] To modify the capacitance of capacitors;

[0062] The energy saved for the user's power distribution network;

[0063] J represents electricity cost.

[0064] To address the aforementioned technical problems, the present invention also provides a user distribution network energy-saving determination device, comprising:

[0065] Memory, used to store computer programs;

[0066] A processor is configured to execute the computer program to implement the steps of the user distribution network energy-saving determination method as described in claim 1.

[0067] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the user distribution network energy-saving determination method as described in claims.

[0068] To address the aforementioned technical problems, the present invention also provides a user distribution network energy-saving determination system, comprising:

[0069] Model determination unit, used to establish the user distribution network model;

[0070] The first total loss determination unit is used to determine the first total loss of active power in the user distribution network during the first preset time period based on the user distribution network model.

[0071] A reactive power compensation unit is used to determine the nodes for reactive power compensation in the user distribution network model and to perform reactive power compensation on the nodes for reactive power compensation.

[0072] The second total loss determination unit is used to determine the second total loss of active power of the user distribution network in a second preset time period according to the user distribution network model after reactive power compensation is performed on the node, wherein the first preset time period and the second preset time period have the same duration.

[0073] An energy determination unit is used to determine the energy saved based on the first total loss and the second total loss.

[0074] This invention provides a method, device, system, and computer medium for determining energy saving in user distribution networks. By using a user distribution network model, the first total loss of active power in the user distribution network is calculated. Then, reactive power compensation is performed on the user distribution network, and the second total loss of active power after reactive power compensation is calculated. This determines the energy that can be saved in the user distribution network, facilitating the identification of its energy-saving potential. It also allows enterprises to optimize the user distribution network based on the saved energy, better adapting to the current state of enterprise development, reducing energy losses, and saving energy. Attached Figure Description

[0075] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1 A process flowchart of a user distribution network energy saving determination method provided by the present invention;

[0077] Figure 2 A user distribution network model provided by the present invention;

[0078] Figure 3 This is a schematic diagram of the structure of a user distribution network energy-saving determination device provided by the present invention;

[0079] Figure 4 This is a schematic diagram of the composition of a user distribution network energy-saving determination system provided by the present invention. Detailed Implementation

[0080] The core of this invention is to provide a method, device, system, and computer medium for determining energy saving in a user distribution network; to determine the energy that can be saved in a user distribution network, which facilitates the determination of the energy-saving potential of the user distribution network, and enables enterprises to optimize the user distribution network based on the saved energy, making it more suitable for the current development of enterprises, reducing power loss, and saving energy.

[0081] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0082] Reference Figure 1 , Figure 1 A process flowchart for determining energy saving in a user distribution network provided by the present invention includes:

[0083] S11: Establish a user distribution network model;

[0084] S12: Determine the first total loss of active power in the user distribution network during the first preset time period based on the user distribution network model;

[0085] S13: Determine the nodes for reactive power compensation in the user's distribution network model and perform reactive power compensation on the nodes.

[0086] S14: After reactive power compensation is performed on the nodes, the second total loss of active power in the user distribution network during the second preset time period is determined according to the user distribution network model, wherein the first preset time period and the second preset time period have the same duration.

[0087] S15: Determine the energy saved based on the first total loss and the second total loss.

[0088] To assess the energy-saving potential of a user's distribution network, this invention provides a method for determining energy-saving potential in a user's distribution network. This method involves calculating the active power loss (i.e., the first total loss) of the user's distribution network during a first preset time period, and then calculating the second total active power loss of the user's distribution network during a second preset time period of the same duration as the first preset time period after implementing reactive power compensation. Subtracting the second total loss from the first total loss yields the energy that can be saved by the user's distribution network.

[0089] The specific implementation process is as follows: First, obtain the relevant basic parameters of the user's distribution network from the user's management system. Combined with the on-site survey, establish a user distribution network model. The user distribution network model includes: electrical file parameters of power grid equipment: ① transformer model, capacity, no-load loss, load loss, no-load current percentage, short-circuit voltage percentage; ② branch model, length, cross-sectional area, material, current carrying capacity; power grid topology: interconnection data of transformers, branches, and switching equipment; select one month as the length of the first preset period and obtain the historical electricity load curve of the user's distribution network for one month. The electricity load curve includes active power and reactive power; user distribution network model reference. Figure 2 , Figure 2 In the model, #0, #1, #2, #3, #4, and #5 are nodes in the user distribution network model. The transformer is the transformer itself. #0 is the high-voltage side of the transformer and is the balancing node. Typically, the transformer is a 10kV distribution transformer. Lines 1, 2, 3, and 4 are branches. Switching equipment connected after nodes #3, #4, and #5 are the power load nodes, also known as PQ nodes. Figure 2 In this context, P represents active power and Q represents reactive power, such as... The active power of node #1 The active power of node #1, The active power at the beginning of branch line2. This represents the active power at the end of branch line2.

[0090] It should be noted that the user distribution network model is determined based on the actual user distribution network. The impedance data of each transformer and branch in the user distribution network model are derived from electrical parameters according to power industry standards. After determining the user distribution network model, the first total active power loss of the user distribution network over a historical month can be calculated based on power flow calculations. Then, the reactive power compensation nodes are determined based on the user distribution network model. It should be noted that reactive power compensation nodes are generally not balancing nodes; compensators can be added to these nodes to reduce active power losses in the user distribution network. After reactive power compensation is applied to the user distribution network model, the second total active power loss over a historical month is calculated. E represents the amount of electricity saved in one month, in kWh. This represents the energy loss at a specific point in a given month, expressed in kWh. This is the loss at a certain moment within a month after reactive power compensation, expressed in kWh. This helps determine the energy that can be saved in the user's distribution network within a month, facilitating the assessment of the energy-saving potential of the user's distribution network. It also enables enterprises to optimize the user's distribution network based on the saved energy, making it more suitable for the current development of enterprises, reducing energy losses, and saving energy.

[0091] Based on the above embodiments:

[0092] As a preferred embodiment, S12: Determining the first total active power loss of the user distribution network in the first preset time period based on the user distribution network model includes:

[0093] The active power at the beginning and the active power at the end of each branch in the user distribution network are determined based on the user distribution network model during the first preset time period.

[0094] The active power at the beginning and the active power at the end of all branches in the first preset time period are summed to obtain the first total loss of active power in the user distribution network in the first preset time period.

[0095] S14: Determine the second total active power loss of the user's distribution network in the second preset time period based on the user's distribution network model, including:

[0096] The active power at the beginning and the active power at the end of each branch in the user distribution network are determined based on the user distribution network model during the second preset time period.

[0097] The active power at the beginning and the active power at the end of all branches in the second preset time period are summed to obtain the second total loss of active power in the user distribution network in the second preset time period.

[0098] Specifically, in this embodiment, the total active power loss of each branch in the user distribution network model is selected as the total active power loss of the user distribution network model, based on... The formula, where NL represents the set of all branches in the user's distribution network, can be referenced. Figure 2 , The active power at the beginning of the branch line. The active power at the end of the branch is used to obtain the active power loss of each branch in the user distribution network model at a certain moment. Based on the electricity load curve of the user distribution network over a historical month, the first total active power loss of the user distribution network over a historical month can be obtained through the power flow calculation algorithm. Similarly, the second total active power loss of the user distribution network after reactive power compensation over a period of one month can be obtained. In this embodiment, the active power loss of the first and last segments of each branch in the user distribution network is selected as the active power loss of the user distribution network, making the calculation results of the active power loss of the user distribution network more reasonable and accurate.

[0099] As a preferred embodiment, determining the nodes for reactive power compensation in the user distribution network model includes:

[0100] Based on the user distribution network model, determine the adjustable space quantification index of each node in the user distribution network;

[0101] The adjustable space quantification index is:

[0102] ;

[0103] The adjustable space quantification index is given to the i-th node in the user distribution network model, which includes nodes and slack nodes.

[0104] Let be the average reactive power of the i-th node during the first preset time period;

[0105] The reactive power compensation spatial weights range from 0 to 1;

[0106] For voltage regulation weights;

[0107] The average voltage of the balancing node during the first preset time period;

[0108] The average voltage of the i-th node during the first preset time period;

[0109] The node corresponding to the maximum value in the adjustable space quantification index is determined as the node for reactive power compensation.

[0110] Specifically, considering that the reactive power compensation of different nodes has different impacts on the user's distribution network, as a preferred embodiment, this embodiment combines the average reactive power of the node in the selected historical month and the voltage difference between the voltage of the equilibrium point and the average voltage of the node in the historical month to select the reactive power compensation node. Reactive power compensation is performed at the node with the largest adjustable space index quantification value, which is conducive to reducing the cost of reactive power compensation.

[0111] As a preferred embodiment, reactive power compensation is performed on the reactive power compensation node, including:

[0112] Reactive power compensation is performed on nodes based on constraints.

[0113] The constraints are as follows:

[0114] ;

[0115] ;

[0116] First branch load rate threshold;

[0117] First transformer load rate threshold;

[0118] The compensation capacity of the reactive power compensation nodes in the user's distribution network model. To compensate for the lower limit of capacity, This is the upper limit of the compensation capacity;

[0119] Let be the real part of the voltage at the i-th node in the user distribution network model. Let be the imaginary part of the voltage at the i-th node in the user distribution network model. This represents the lower limit of the voltage at the i-th node in the user distribution network model. This represents the upper limit of the voltage at the i-th node in the user distribution network model;

[0120] Let j be the line current of the j-th branch in the user distribution network model. Let j be the current carrying capacity of the j-th branch in the user distribution network model;

[0121] The active power on the high-voltage side of the z-th transformer in the user distribution network model;

[0122] The reactive power on the high-voltage side of the z-th transformer in the user distribution network model;

[0123] Let be the rated capacity of the z-th transformer in the user distribution network model.

[0124] Specifically, considering the limitations of user distribution networks in practical applications, this embodiment incorporates constraints when performing reactive power compensation on the user distribution network model, such as the upper and lower limits of the compensation capacity of nodes without functional compensation, the upper and lower limits of each node in the user distribution network model, and the load rate limits of each branch and transformer. Typically, the load rate of the first branch and the load rate of the first transformer are 80%, making the user distribution network model after reactive power compensation more practically valuable and making the obtained second total loss more reasonable and effective.

[0125] As a preferred embodiment, S14: Before determining the nodes for reactive power compensation in the user's distribution network model and performing reactive power compensation on the nodes, the method further includes:

[0126] Based on the user distribution network model, determine the branch load rate and transformer load rate of each branch in the user distribution network.

[0127] Based on the branch load rate and / or transformer load rate, determine whether to generate a user distribution network upgrade decision;

[0128] If so, rebuild the user distribution network model based on the user's distribution network transformation decision;

[0129] If not, proceed to determine the nodes in the user's distribution network model that require reactive power compensation and perform reactive power compensation on those nodes.

[0130] In practical applications, besides reactive power compensation reducing active power loss in user distribution networks, upgrading branches and / or transformers in user distribution networks can also reduce active power loss. This embodiment considers whether to upgrade the user distribution network, performs power flow calculations on the user distribution network model, and determines the branch load rate and transformer load rate of each branch within a selected historical month. The formula for the branch load rate is: , The current unit for the corresponding branch is A. The corresponding branch current carrying capacity is in units of A; the transformer load rate is... , This refers to the active power on the high-voltage side of the transformer, in kW. This refers to the reactive power on the high-voltage side of the transformer, in kW. The rated capacity of the transformer is expressed in kVA. , and The value obtained is the value of the user distribution network model obtained through power flow calculation at a certain moment within a historical month. and The values ​​of the user distribution network model at a certain point in a historical month are used. Based on the branch load rate and transformer load rate, a decision is made to generate a user distribution network upgrade plan. The user distribution network model is then rebuilt based on this upgrade plan. This implementation's settings are more conducive to reducing active power losses in the user distribution network.

[0131] As a preferred embodiment, determining whether to generate a user distribution network upgrade decision based on branch load rate and / or transformer load rate includes:

[0132] Determine whether there is a branch load rate greater than the first branch load rate threshold during the first preset time period, and / or whether there is a transformer load rate greater than the first transformer load rate threshold during the first preset time period.

[0133] If the branch load rate of a branch is greater than the first branch load rate threshold, a user distribution network transformation decision is generated. The user distribution network transformation decision is to replace the branch whose branch load rate is greater than the first branch load rate threshold, so that the load rate of the replaced branch is not greater than the second branch load rate threshold, and the second branch load rate threshold is not greater than the first branch load rate threshold.

[0134] And / or,

[0135] If the transformer load rate of a transformer is greater than the first transformer load rate threshold, a user distribution network modification decision is generated. The user distribution network modification decision is to replace the transformer whose transformer load rate is greater than the first transformer load rate threshold, so that the load rate of the replaced transformer is not greater than the second transformer load rate threshold, and the second transformer load rate threshold is not greater than the first transformer load rate threshold.

[0136] If the load rate of a branch without a branch is greater than the first branch load rate threshold and the load rate of a transformer without a transformer is greater than the first transformer load rate threshold, it is determined that no user distribution network modification decision will be generated.

[0137] Specifically, this embodiment determines whether to generate a user distribution network upgrade decision by judging whether there is a branch load rate greater than the first branch load rate threshold and / or whether there is a transformer load rate greater than the first transformer load rate threshold within a historical month. It should be noted that the first branch load rate threshold and the first transformer load rate threshold are usually 80%, and the second branch load rate threshold and the second transformer load rate threshold are usually 50% of the economic load rate, making the user distribution network upgrade more reasonable and closer to actual application, and the saved electricity is closer to the actual saved electricity.

[0138] As a preferred embodiment, S15: After determining the saved energy based on the first total loss and the second total loss, the method further includes:

[0139] The payback period for investment is determined based on the amount of electricity saved;

[0140] The investment payback period is:

[0141] ;

[0142] Cost of upgrading a branch road per unit length;

[0143] Cost of upgrading a transformer per unit capacity;

[0144] Cost per unit capacity reactive power compensator;

[0145] To modify the length of the branch road;

[0146] To upgrade the capacity of the transformer;

[0147] To modify the capacitance of capacitors;

[0148] Energy saved for the user's power distribution network;

[0149] J represents electricity cost.

[0150] Specifically, considering that reactive power compensation for user distribution networks and the decision-making process for upgrading production user distribution networks require additional costs for users, this embodiment provides the user's investment payback period as a preferred implementation. It should be noted that... The unit is yuan / km. The unit is yuan / kVA. The unit is yuan / kVar. The unit is km. The unit is kVA. The unit is yuan (kVar). The unit is kWh, and J is in yuan / kVA, so that users can clearly understand the cost of upgrading their distribution network and how many years it will take to recoup the investment in upgrading through the saved electricity, which facilitates users' decision-making.

[0151] refer to Figure 3 , Figure 3 The present invention provides a schematic diagram of a user distribution network energy-saving determination device, comprising:

[0152] Memory 31 is used to store computer programs;

[0153] Processor 32 is configured to execute a computer program to implement the steps of the user distribution network energy saving determination method as claimed in the present invention.

[0154] For an introduction to the user distribution network energy-saving determination device provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0155] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by processor 32, implements the steps of the user distribution network energy-saving determination method as claimed in the present invention.

[0156] For a description of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0157] refer to Figure 4 , Figure 4 This is a schematic diagram of the composition of a user distribution network energy-saving determination system provided by the present invention, including:

[0158] Model determination unit 41 is used to establish a user distribution network model;

[0159] The first total loss determination unit 42 is used to determine the first total loss of active power in the user distribution network during the first preset time period based on the user distribution network model.

[0160] The reactive power compensation unit 43 is used to determine the nodes for reactive power compensation in the user's distribution network model and to perform reactive power compensation on the nodes.

[0161] The second total loss determination unit 44 is used to determine the second total loss of active power in the user distribution network in the second preset time period according to the user distribution network model after reactive power compensation is performed on the node, wherein the first preset time period and the second preset time period have the same duration.

[0162] The power consumption determination unit 45 is used to determine the power consumption saved based on the first total loss and the second total loss.

[0163] In one preferred embodiment, the first total loss determination unit 42 includes:

[0164] The first branch unit is used to determine the active power at the beginning and the active power at the end of each branch in the user distribution network during the first preset time period, based on the user distribution network model.

[0165] The first summation unit is used to sum the active power at the beginning and the active power at the end of all branches in the first preset time period to obtain the first total loss of active power in the user distribution network in the first preset time period.

[0166] The second total loss determination unit 44 includes:

[0167] The second branch unit is used to determine the active power at the beginning and the active power at the end of each branch in the user distribution network during the second preset time period, based on the user distribution network model.

[0168] The second summation unit is used to sum the active power at the beginning and the active power at the end of all branches in the second preset time period to obtain the second total loss of active power in the user distribution network in the second preset time period.

[0169] As a preferred embodiment, the reactive power compensation unit 43 includes:

[0170] Adjustable unit, used to determine the adjustable spatial quantification index of each node in the user distribution network based on the user distribution network model;

[0171] The adjustable space quantification index is:

[0172] ;

[0173] The adjustable space quantification index is given to the i-th node in the user distribution network model, which includes nodes and slack nodes.

[0174] Let be the average reactive power of the i-th node during the first preset time period;

[0175] The reactive power compensation spatial weights range from 0 to 1.

[0176] For voltage regulation weights;

[0177] The average voltage of the balancing node during the first preset time period;

[0178] The average voltage of the i-th node during the first preset time period;

[0179] The node determination unit is used to determine the node corresponding to the maximum value in the adjustable space quantification index as the node for reactive power compensation.

[0180] As a preferred embodiment, the reactive power compensation unit 43 includes:

[0181] The first reactive power compensation unit 43 is used to perform reactive power compensation on the reactive power compensation node based on the constraint conditions.

[0182] The constraints are as follows:

[0183] ;

[0184] ;

[0185] First branch load rate threshold;

[0186] First transformer load rate threshold;

[0187] For reactive power compensation node compensation capacity in the user distribution network model, To compensate for the lower limit of capacity, To compensate for the maximum capacity;

[0188] Let be the real part of the voltage at the i-th node in the user distribution network model. Let be the imaginary part of the voltage at the i-th node in the user distribution network model. Let be the lower voltage limit of the i-th node in the user distribution network model. This represents the upper voltage limit of the i-th node in the user distribution network model;

[0189] Let j be the line current of the j-th branch in the user distribution network model. Let j be the current carrying capacity of the j-th branch in the user distribution network model;

[0190] The active power on the high-voltage side of the z-th transformer in the user distribution network model;

[0191] The reactive power on the high-voltage side of the z-th transformer in the user distribution network model;

[0192] Let be the rated capacity of the z-th transformer in the user distribution network model.

[0193] In a preferred embodiment, the reactive power compensation unit 43 further includes:

[0194] The load factor unit is used to determine the branch load factor and transformer load factor of each branch in the user's distribution network based on the user's distribution network model.

[0195] The first judgment unit is used to determine whether to generate a user distribution network transformation decision based on the branch load rate and / or transformer load rate. If yes, the first sub-unit is triggered; if no, the second sub-unit is triggered.

[0196] The first sub-unit involves re-establishing the user distribution network model based on user distribution network transformation decisions.

[0197] The second sub-unit involves determining the nodes in the user's distribution network model that will receive reactive power compensation and performing reactive power compensation on those nodes.

[0198] As a preferred embodiment, the first determination unit includes:

[0199] The second judgment unit is used to determine whether there is a branch load rate greater than the first branch load rate threshold in the first preset time period, and / or whether there is a transformer load rate greater than the first transformer load rate threshold in the first preset time period. If yes, the third sub-unit is triggered; if no, the fourth sub-unit is triggered.

[0200] The third subunit is used to determine and generate a user distribution network transformation decision if the branch load rate of a branch is greater than the first branch load rate threshold. The user distribution network transformation decision is to replace the branch whose branch load rate is greater than the first branch load rate threshold so that the load rate of the replaced branch is not greater than the second branch load rate threshold, and the second branch load rate threshold is not greater than the first branch load rate threshold.

[0201] And / or,

[0202] If the transformer load rate of a transformer is greater than the first transformer load rate threshold, a user distribution network modification decision is generated. The user distribution network modification decision is to replace the transformer whose transformer load rate is greater than the first transformer load rate threshold, so that the load rate of the replaced transformer is not greater than the second transformer load rate threshold, and the second transformer load rate threshold is not greater than the first transformer load rate threshold.

[0203] The fourth subunit is used to determine that no user distribution network modification decision is generated if the branch load rate of a non-existent branch is greater than the first branch load rate threshold and the transformer load rate of a non-existent transformer is greater than the first transformer load rate threshold.

[0204] In a preferred embodiment, the power determination unit 45 further includes:

[0205] The investment payback period determination unit is used to determine the investment payback period based on the saved electricity.

[0206] The investment payback period is:

[0207] ;

[0208] Cost of upgrading a branch road per unit length;

[0209] Cost of upgrading a transformer per unit capacity;

[0210] Cost per unit capacity reactive power compensator;

[0211] To modify the length of the branch road;

[0212] To upgrade the capacity of the transformer;

[0213] To modify the capacitance of capacitors;

[0214] Energy saved for the user's power distribution network;

[0215] J represents electricity cost.

[0216] For an introduction to the user distribution network energy-saving determination system provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0217] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0218] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining energy saving in a user distribution network, characterized in that, include: Establish a user distribution network model; The first total loss of active power in the user distribution network during the first preset time period is determined based on the user distribution network model. Identify the nodes in the user distribution network model that will receive reactive power compensation and perform reactive power compensation on the nodes. After reactive power compensation is performed on the node, the second total loss of active power in the user distribution network during the second preset time period is determined according to the user distribution network model, wherein the first preset time period and the second preset time period have the same duration. The energy saved is determined based on the first total loss and the second total loss; The first total active power loss of the user distribution network in the first preset time period is determined according to the user distribution network model, including: The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the first preset time period. The active power at the beginning and the active power at the end of all branches in the first preset time period are summed to obtain the first total loss of active power in the user distribution network in the first preset time period. The second total active power loss of the user distribution network in the second preset time period is determined according to the user distribution network model, including: The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the second preset time period. The active power at the beginning and the active power at the end of all branches in the second preset time period are summed to obtain the second total loss of active power in the user distribution network in the second preset time period. Determining the nodes for reactive power compensation in the user distribution network model includes: Based on the user distribution network model, determine the adjustable space quantification index of each node in the user distribution network; The adjustable space quantification index is: ； The adjustable space quantification index is used for the i-th node in the user distribution network model, which includes nodes and slack nodes; The average reactive power of the i-th node during the first preset time period; The reactive power compensation spatial weights range from 0 to 1; For voltage regulation weights; The average voltage of the balancing node during the first preset time period; The average voltage of the i-th node during the first preset time period; The node corresponding to the maximum value in the adjustable space quantification index is determined as the node for reactive power compensation.

2. The method for determining energy saving in a user distribution network as described in claim 1, characterized in that, Performing reactive power compensation on the nodes mentioned above includes: Reactive power compensation is performed on the nodes subject to constraints. The constraints are as follows: ； ； ； ； The compensation capacity of the reactive power compensation nodes in the user distribution network model. To compensate for the lower limit of capacity, To compensate for the upper limit of capacity; Let be the real part of the voltage at the i-th node in the user distribution network model. Let be the imaginary part of the voltage at the i-th node in the user distribution network model. Let be the lower limit value of the voltage of the i-th node in the user distribution network model. This represents the upper limit of the voltage at the i-th node in the user distribution network model. Let j be the line current of the j-th branch in the user distribution network model. Let j be the current carrying capacity of the j-th branch in the user distribution network model; The active power on the high-voltage side of the z-th transformer in the user distribution network model; The reactive power on the high-voltage side of the z-th transformer in the user distribution network model; Let be the rated capacity of the z-th transformer in the user distribution network model.

3. The method for determining energy saving in a user distribution network as described in any one of claims 1 to 2, characterized in that, Before determining the nodes for reactive power compensation in the user distribution network model and performing reactive power compensation on the nodes, the process further includes: Based on the user distribution network model, determine the branch load rate and transformer load rate of each branch in the user distribution network. Based on the branch load rate and / or the transformer load rate, determine whether to generate a user distribution network renovation decision; If so, rebuild the user distribution network model based on the aforementioned user distribution network transformation decision; If not, proceed to the step of determining the node for reactive power compensation in the user distribution network model and performing reactive power compensation on the node.

4. The method for determining energy saving in a user distribution network as described in claim 3, characterized in that, Based on the branch load rate and / or the transformer load rate, determine whether to generate a user distribution network upgrade decision, including: Determine whether there is a branch load rate greater than a first branch load rate threshold during the first preset time period, and / or whether there is a transformer load rate greater than a first transformer load rate threshold during the first preset time period; If the branch load rate of a branch is greater than the first branch load rate threshold, a user distribution network transformation decision is generated. The user distribution network transformation decision is to replace the branch whose branch load rate is greater than the first branch load rate threshold, so that the load rate of the replaced branch is not greater than the second branch load rate threshold, and the second branch load rate threshold is not greater than the first branch load rate threshold. And / or, If the transformer load rate of a transformer is greater than the first transformer load rate threshold, a user distribution network transformation decision is generated. The user distribution network transformation decision is to replace the transformer whose transformer load rate is greater than the first transformer load rate threshold, so that the load rate of the replaced transformer is not greater than the second transformer load rate threshold, and the second transformer load rate threshold is not greater than the first transformer load rate threshold. If no branch load rate of the specified branch is greater than the first branch load rate threshold and no transformer load rate of the specified transformer is greater than the first transformer load rate threshold, it is determined that no user distribution network modification decision will be generated.

5. The method for determining energy saving in a user distribution network as described in claim 4, characterized in that, After determining the energy savings based on the first total loss and the second total loss, the method further includes: The payback period for the investment is determined based on the energy savings mentioned above; The investment payback period is: ； Cost of upgrading a branch road per unit length; Cost of upgrading a transformer per unit capacity; Cost per unit capacity reactive power compensator; To modify the length of the branch road; To upgrade the capacity of the transformer; To modify the capacitance of capacitors; The energy saved for the user's power distribution network; J represents electricity cost.

6. A device for determining energy saving in a user distribution network, characterized in that, include: Memory, used to store computer programs; A processor is configured to execute the computer program to implement the steps of the user distribution network energy saving determination method as described in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the user distribution network energy-saving determination method as described in any one of claims 1 to 5.

8. A user distribution network energy-saving determination system, characterized in that, include: Model determination unit, used to establish the user distribution network model; The first total loss determination unit is used to determine the first total loss of active power in the user distribution network during the first preset time period based on the user distribution network model. A reactive power compensation unit is used to determine the nodes for reactive power compensation in the user distribution network model and to perform reactive power compensation on the nodes for reactive power compensation. The second total loss determination unit is used to determine the second total loss of active power of the user distribution network in a second preset time period according to the user distribution network model after reactive power compensation is performed on the node, wherein the first preset time period and the second preset time period have the same duration. An energy determination unit is used to determine the energy saved based on the first total loss and the second total loss; The first total loss determination unit is specifically used for: The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the first preset time period. The active power at the beginning and the active power at the end of all branches in the first preset time period are summed to obtain the first total loss of active power in the user distribution network in the first preset time period. The second total active power loss of the user distribution network in the second preset time period is determined according to the user distribution network model, including: The active power at the beginning and the active power at the end of each branch in the user distribution network are determined according to the user distribution network model in the second preset time period. The active power at the beginning and the active power at the end of all branches in the second preset time period are summed to obtain the second total loss of active power in the user distribution network in the second preset time period. Determining the nodes for reactive power compensation in the user distribution network model includes: Based on the user distribution network model, determine the adjustable space quantification index of each node in the user distribution network; The adjustable space quantification index is: ； The adjustable space quantification index is used for the i-th node in the user distribution network model, which includes nodes and slack nodes; The average reactive power of the i-th node during the first preset time period; The reactive power compensation spatial weights range from 0 to 1; For voltage regulation weights; The average voltage of the balancing node during the first preset time period; The average voltage of the i-th node during the first preset time period; The node corresponding to the maximum value in the adjustable space quantification index is determined as the node for reactive power compensation.

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