A configuration method and device of a low-voltage device, equipment and storage medium

Abstract

The application discloses a configuration method and device of a low-voltage device, equipment and a storage medium, comprising: obtaining and drawing a topological single-line diagram of a power distribution network according to a target line network topology diagram, line impedance parameters and load parameters; generating an admittance matrix of a power distribution line according to the topological single-line diagram, and performing power flow calculation on the admittance matrix to obtain power flow voltages of each node in the power distribution line; when the power flow voltage of a node in the power distribution line is less than a preset minimum voltage, calculating the power factor of each node in the current power distribution line, and determining whether there is a node with a power factor less than a preset minimum power factor; if there is, determining a first node from the power distribution line according to the preset minimum power factor, and taking the first node as an installation node of a reactive power compensation device; if not, determining a second node from the power distribution line according to the preset minimum voltage, and taking the second node as an installation node of a voltage regulator.

Description

Technical Field

[0001] This invention relates to the field of low voltage management technology in power distribution networks, and in particular to a method, apparatus, equipment and storage medium for configuring a low voltage device. Background Technology

[0002] With the increasing electrification of my country's industry, the stone and wood product industries in remote rural areas have invested heavily in high-power motors such as crushers, planers, and drilling rigs, severely impacting the power factor of rural power distribution lines and increasing energy losses. Therefore, it is necessary to address the problems of low voltage and high power loss in rural power distribution lines. Low voltage mitigation devices mainly consist of series voltage regulators and reactive power compensation devices. Traditionally, after determining the location of the series voltage regulator, the reactive power compensation device is often added after the regulator, or its capacity and location are configured empirically from the end of the line forward.

[0003] However, research on the power flow of existing distribution network lines has revealed that both active and reactive power flows in distribution lines cause voltage drops across the line impedance. The connection of reactive power compensation devices can only change the power flow before the connection point and cannot improve the power flow distribution after the connection point. Therefore, the traditional configuration method of low voltage control devices does not fully utilize the ability of reactive power compensation devices and voltage regulators to improve the line power factor and control low voltage. It fails to fully utilize the function of reactive power compensation devices, which may lead to excessive capacity configuration at some nodes in the distribution line, and the power factor of some nodes still not meeting the standards.

[0004] Therefore, there is an urgent need for a low-voltage device configuration method that can reduce the device configuration capacity and comprehensively improve the power quality of the distribution network. Summary of the Invention

[0005] This invention provides a method, apparatus, device, and storage medium for configuring a low-voltage device, in order to solve the technical problem that the prior art does not fully utilize the ability of reactive power compensation devices to improve the power factor of lines and manage low voltage.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a method for configuring a low-voltage device, comprising:

[0007] Obtain and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters, and load parameters;

[0008] Based on the topology single-line diagram, the admittance matrix of the distribution line is generated, and power flow calculation is performed on the admittance matrix to obtain the power flow voltage of each node in the distribution line.

[0009] When the power flow voltage of a node in a power distribution line is less than the preset minimum voltage, calculate the power factor of each node in the current power distribution line and determine whether there is a node whose power factor is less than the preset minimum power factor.

[0010] If it exists, the first node is determined from the power distribution line according to the preset minimum power factor, and the first node is used as the installation node of the reactive power compensation device. Then the power distribution line is updated, and the first node after the initial route is re-determined, thereby completing the configuration of the reactive power compensation device.

[0011] If it does not exist, a second node is determined from the power distribution line according to the preset minimum voltage, and the second node is used as the installation node of the voltage regulator. Then, the power distribution line is updated after the voltage regulator is determined, and the second node after the updated power distribution line is re-determined. The voltage regulator is then determined for the re-determined second node, thereby completing the configuration of the voltage regulator.

[0012] As a preferred embodiment, the method for calculating the power flow voltage at each node within the distribution line by performing power flow calculation on the admittance matrix is ​​as follows:

[0013] U = YI

[0014] Where U represents the fundamental voltage of each node, Y represents the admittance matrix of the distribution line in the single-line diagram of the topology, and I represents the fundamental current injected into each node.

[0015] As a preferred embodiment, the method for calculating the power factor of each node of the current power distribution line is as follows:

[0016]

[0017] Where, λ i Let u be the power factor of node i in the power distribution line. i Let u be the voltage at node i in the power distribution line. i-1 Let y be the voltage of the node preceding node i in the power distribution line. i-1,i Let i be the mutual admittance between node i-1 and node i.

[0018] As a preferred embodiment, determining the first node from the power distribution line based on the preset minimum power factor specifically involves:

[0019] Starting from the end of the power distribution line and moving backward, the first node whose power factor is less than the preset minimum power factor is identified as the first node.

[0020] As a preferred embodiment, the first node is used as the installation node for the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, thus completing the configuration of the reactive power compensation device. Specifically:

[0021] The first node is used as the installation node for the reactive power compensation device, and the reactive power compensation device is added to the first node in the power distribution line, thereby updating the power distribution line.

[0022] Perform power flow calculations on the updated power distribution lines to obtain the power factor of the first node;

[0023] If the power factor of the first node is less than the preset target power factor, then a reactive power compensation device is added to the first node in the power distribution line, and a power flow calculation is performed on the power distribution line after the addition of the reactive power compensation device to obtain the power factor of the first node after the addition, until the power factor of the first node is greater than the preset target power factor.

[0024] When the power factor of the first node is greater than the preset target power factor, the system traverses backward from the end of the updated power distribution line, and re-determines the first node whose power factor is less than the preset minimum power factor as the first node. The reactive power compensation device is then added to the re-determined first node, and the power distribution line is updated and the power flow is calculated to obtain the power factor of the re-determined first node. This process continues until the first node can no longer be determined in the continuously updated power distribution line, thus completing the configuration of the reactive power compensation device.

[0025] As a preferred embodiment, determining the second node from the power distribution line based on the preset minimum voltage specifically involves:

[0026] Traverse the power distribution line from the beginning to the end, and determine the last node whose power flow voltage is less than the preset minimum voltage as the second node.

[0027] As a preferred embodiment, the second node is used as the installation node for the voltage regulator. Then, after determining the voltage regulator's range, the power distribution line is updated, and the second node after the updated power distribution line is re-determined. Finally, the voltage regulator's range is determined at the re-determined second node, thereby completing the voltage regulator configuration. Specifically:

[0028] The second node is used as the installation node for the voltage regulator, and the voltage regulator is installed and its range is set in the power distribution line at the first node, thereby updating the power distribution line; wherein, the range of the voltage regulator is set to the lowest range;

[0029] Increase the voltage regulator's setting by one level, perform power flow calculations on the updated power distribution line, and obtain the power flow voltage of the second node;

[0030] If the power flow voltage of the second node is less than the preset maximum voltage, the voltage regulator level is increased by one level, and the power flow calculation is performed on the updated power distribution line to obtain the power flow voltage of the second node after the voltage regulator level is increased, until the power flow voltage obtained by the power flow calculation is greater than the preset maximum voltage.

[0031] When the power flow voltage of the second node is greater than the preset maximum voltage, the voltage regulator is lowered to the level before the previous increase. Then, starting from the end of the updated power distribution line and moving backward, the node with the last power flow voltage less than the preset minimum voltage is re-identified as the second node. The voltage regulator is then installed and its level is set for the re-identified second node. The current voltage regulator level is then increased by one level, and the power distribution line is updated and power flow calculations are performed to obtain the power flow voltage of the re-identified second node. This process continues until no second node can be identified in the continuously updated power distribution line, thus completing the installation and level setting of the voltage regulator.

[0032] Accordingly, the present invention also provides a configuration device for a low-voltage device, comprising: a drawing module, a calculation module, a judgment module, a reactive power compensation device configuration module, and a voltage regulator configuration module;

[0033] The drawing module is used to acquire and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters, and load parameters.

[0034] The calculation module is used to generate the admittance matrix of the distribution line according to the topology single-line diagram, and to perform power flow calculation on the admittance matrix to obtain the power flow voltage of each node in the distribution line.

[0035] The judgment module is used to calculate the power factor of each node in the current power distribution line when the power flow voltage of a node in the power distribution line is less than the preset minimum voltage, and to determine whether there is a node whose power factor is less than the preset minimum power factor.

[0036] The reactive power compensation device configuration module is used to determine a first node from the power distribution line according to the preset minimum power factor if there is a node with a power factor less than the preset minimum power factor, and use the first node as the installation node of the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, so as to complete the configuration of the reactive power compensation device.

[0037] The voltage regulator configuration module is used to determine a second node from the power distribution line based on the preset minimum voltage if there is no node with a power factor less than the preset minimum power factor, and to use the second node as the installation node of the voltage regulator. Then, the voltage regulator is configured by determining the voltage range and updating the power distribution line, re-determining the second node after updating the power distribution line, and determining the voltage regulator range on the re-determined second node.

[0038] Accordingly, the present invention also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the configuration method of the low-voltage device as described in any of the preceding claims.

[0039] Accordingly, the present invention also provides a computer-readable storage medium comprising a stored computer program; wherein, when the computer program is executed, it controls the device in which the computer-readable storage medium is located to perform the configuration method of the low-voltage device as described in any of the preceding claims.

[0040] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0041] The technical solution of this invention obtains the target line network topology diagram, line impedance parameters, and load parameters to draw the topology diagram of the distribution network. Then, it performs power flow calculation on the generated admittance matrix to obtain the power flow voltage of each node in the distribution line. By combining the power flow voltage, the power factor of the node is calculated and determined. This invention can combine power flow voltage and power factor to optimize the configuration of reactive power compensation devices and voltage regulators for different nodes in the distribution line. After installing reactive power compensation devices and voltage regulators, the line admittance matrix changes, the power flow changes, the power factor of each node in the line is significantly improved, and the voltage of each node increases slightly. Compared with the prior art, this invention reduces the configuration capacity of voltage regulators to a certain extent and expands the adjustment range of voltage regulators. Attached Figure Description

[0042] Figure 1 : A flowchart illustrating the steps of a low-voltage device configuration method provided in an embodiment of the present invention;

[0043] Figure 2 : This refers to the constructed topology single-line diagram provided in the embodiments of the present invention;

[0044] Figure 3 : A schematic diagram of the Π-type equivalent circuit provided in an embodiment of the present invention;

[0045] Figure 4: A single-line diagram of the topology of the low-voltage problem mitigation device provided in this embodiment of the invention;

[0046] Figure 5 : A schematic diagram showing the voltage amplitude of each node of the main line after voltage management, provided in an embodiment of the present invention;

[0047] Figure 6 : A schematic diagram of the power factor of each node of the main line after voltage management provided in an embodiment of the present invention;

[0048] Figure 7 : This is a schematic diagram of the configuration device for a low-voltage device provided in an embodiment of the present invention. Detailed Implementation

[0049] 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, and 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.

[0050] Example 1

[0051] Please refer to Figure 1 The present invention provides a method for configuring a low-voltage device, comprising the following steps S101-S105:

[0052] S101: Obtain and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters, and load parameters.

[0053] In this embodiment, the target line network topology diagram, line impedance parameters, and load parameters are obtained to determine the main line. Then, using the determined main line, a single-line topology diagram of the distribution network is drawn. For example, the constructed single-line topology diagram is as follows: Figure 2 As shown.

[0054] S102: Based on the topology single-line diagram, generate the admittance matrix of the distribution line, and perform power flow calculation on the admittance matrix to obtain the power flow voltage of each node in the distribution line.

[0055] As a preferred embodiment, the method for calculating the power flow voltage of each node in the distribution line by performing power flow calculation on the admittance matrix is ​​as follows:

[0056] U = YI; where U represents the fundamental voltage of each node, Y represents the admittance matrix of the distribution line in the single-line diagram of the topology, and I represents the fundamental current injected into each node.

[0057] For example, a single-line diagram of a typical distribution network topology in a remote rural area can be drawn, the admittance matrix Y of the distribution line can be generated, the initial power flow can be calculated, and the voltage of each node in the typical distribution network topology in a remote rural area can be obtained.

[0058] In this embodiment, the voltage of each node within the line can be obtained using the power flow formula:

[0059] U = YI (1)

[0060] In the formula, U is an n×1 matrix, and n is the number of points in the model summary. U represents the fundamental voltage of each node, Y is an n×n matrix representing the admittance matrix under this topology and line parameters, and I is an n×1 matrix representing the fundamental current injected at each node. The power flow calculation matrix can be expressed as:

[0061]

[0062] In the formula, y i,i Let y be the self-admittance of node i at the fundamental frequency of the model. i,j Let be the mutual admittance between node i and node j at the fundamental frequency of the model.

[0063] S103: When the power flow voltage of a node in a power distribution line is less than the preset minimum voltage, calculate the power factor of each node in the current power distribution line and determine whether there is a node whose power factor is less than the preset minimum power factor.

[0064] As a preferred embodiment, the method for calculating the power factor of each node of the current power distribution line is as follows:

[0065] Where, λ i Let u be the power factor of node i in the power distribution line. i Let u be the voltage at node i in the power distribution line. i-1 Let y be the voltage of the node preceding node i in the power distribution line. i-1,i Let i be the mutual admittance between node i-1 and node i.

[0066] Understandably, the minimum voltage at each node in the single-line diagram is determined based on the power flow calculation results to see if it is less than U. lower If it is not less than, it means that the node does not need to perform low voltage management and regulation, and therefore does not need to be configured with low voltage devices.

[0067] In this embodiment, the power factor of each node in the single-line distribution line is calculated, and it is determined whether the lowest power factor among the nodes is less than a preset minimum power factor φ. limit This allows us to determine whether each node requires the installation and configuration of a reactive power compensation device or a voltage regulator.

[0068] S104: If it exists, then determine the first node from the power distribution line according to the preset minimum power factor, and use the first node as the installation node of the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, so as to complete the configuration of the reactive power compensation device.

[0069] It is understandable that this is because there are power factors that are less than the preset minimum power factor φ. limit Therefore, this node is a low power factor node device, requiring the addition of an external parallel reactive power compensation device to compensate for the power of this node, thereby improving the power quality, making full use of the power flow improvement capability of the reactive power compensation device, and avoiding the situation where some nodes in the distribution line have excessive capacity and the power factor of some nodes still does not meet the standards.

[0070] As a preferred embodiment, determining the first node from the power distribution line based on the preset minimum power factor specifically involves:

[0071] Starting from the end of the power distribution line and moving backward, the first node whose power factor is less than the preset minimum power factor is identified as the first node.

[0072] It should be noted that since the connection of the reactive power compensation device can only change the power flow before the connection point and cannot improve the power flow distribution after the connection point, it is necessary to traverse backwards from the end of the distribution line to determine the first node sequentially from the end to the beginning. In this embodiment, the first node with a power factor less than the preset minimum power factor λ is found by traversing backwards from the end of the distribution line. l imit The node is designated as the first node A.

[0073] In a preferred embodiment, the step of using the first node as the installation node for the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, thus completing the configuration of the reactive power compensation device, specifically involves:

[0074] The first node is designated as the installation node for the reactive power compensation device. The reactive power compensation device is then added to the first node in the power distribution line, thereby updating the power distribution line. Power flow calculations are performed on the updated power distribution line to obtain the power factor of the first node. If the power factor of the first node is less than a preset target power factor, reactive power compensation devices are added to the first node in the power distribution line, and power flow calculations are performed on the power distribution line after the addition of reactive power compensation devices to obtain the power factor of the first node again, until the power factor of the first node is greater than the preset target power factor. If the power factor of the first node is greater than the preset target power factor, the updated power distribution line is traversed backwards from its end. The first node with a power factor less than a preset minimum power factor is redefined as the first node, and reactive power compensation devices are added to the redefined first node. The power distribution line is then updated and power flow calculations are performed to obtain the power factor of the redefined first node, until no first node can be determined in the continuously updated power distribution line, thus completing the configuration of the reactive power compensation device.

[0075] In this embodiment, a compensation unit with a capacity of Q is added to the first node A. unit The parallel reactive power compensation device is used to calculate the power factor of the power flow; if the power factor of the first node A is greater than the preset target power factor λ... set If the power factor of the first node A is less than the preset target power factor λ, it indicates that the power factor has been compensated and the target power factor has been achieved. Therefore, it is necessary to determine the other nodes in the distribution line to ascertain whether they require power compensation. set If the current first node A has not achieved power factor compensation, it means that the first node A has failed to reach the target power factor. Therefore, it is necessary to continue to add parallel reactive power compensation devices until the first node A reaches the target power factor. Then, it can be determined whether there are other first nodes and whether they need to be compensated.

[0076] Installing a parallel reactive power compensation device with capacity Q at node i is equivalent to connecting a load with reactance X in parallel to node i.

[0077]

[0078] In the formula, U is the rated voltage of the parallel reactive power compensation device. Its effect on the admittance matrix is:

[0079]

[0080] In the formula, y i i This represents the self-admittance of node i in the power distribution line.

[0081] S105: If it does not exist, then determine the second node from the power distribution line according to the preset minimum voltage, and use the second node as the installation node of the voltage regulator. Then, after determining the voltage regulator's range, update the power distribution line, and re-determine the second node after updating the power distribution line. Then, determine the voltage regulator's range on the re-determined second node, thereby completing the configuration of the voltage regulator.

[0082] It is understandable that, since there is no power factor less than the preset minimum power factor φ, limit There are nodes where the power flow voltage is lower than the preset minimum voltage. Therefore, the voltage of these nodes needs to be regulated. This is achieved by installing series voltage regulators to modulate the voltage of these nodes, thereby improving power quality and making full use of the power flow improvement capabilities of the voltage regulators.

[0083] As a preferred embodiment, determining the second node from the power distribution line based on the preset minimum voltage specifically involves:

[0084] Traverse the power distribution line from the beginning to the end, and determine the last node whose power flow voltage is less than the preset minimum voltage as the second node.

[0085] It should be noted that, since voltage regulators are different from reactive power compensation devices, the process of determining the installation node of voltage regulators can be carried out from the beginning of the power distribution line backwards, and the node where the last power flow voltage on the power distribution line is less than the preset minimum voltage is determined as the second node B.

[0086] In a preferred embodiment, the step of using the second node as the installation node of the voltage regulator, then updating the power distribution line after determining the voltage regulator's range, re-determining the second node after the updated power distribution line, and determining the voltage regulator's range on the re-determined second node, thereby completing the configuration of the voltage regulator, specifically involves:

[0087] The second node is used as the installation node for the voltage regulator. The voltage regulator is installed and its speed setting is configured on the first node within the power distribution line, thereby updating the power distribution line. The voltage regulator's speed setting is set to the lowest level. The voltage regulator's speed is then increased by one level, and power flow calculations are performed on the updated power distribution line to obtain the power flow voltage of the second node. If the power flow voltage of the second node is less than the preset maximum voltage, the voltage regulator's speed is increased by one level, and power flow calculations are performed on the updated power distribution line again to obtain the power flow voltage of the second node after the current increase in voltage regulator speed, until the power flow voltage obtained from the power flow calculation is greater than... The voltage regulator is set to a preset maximum voltage. When the power flow voltage of the second node is greater than the preset maximum voltage, the voltage regulator is lowered to the level before the previous increase. The power flow is then traversed backward from the end of the updated power distribution line. The node with the last power flow voltage less than the preset minimum voltage is re-identified as the second node. The voltage regulator is then installed and its level is set for the re-identified second node. The voltage regulator level is then increased by one level, and the power distribution line is updated and the power flow is calculated to obtain the power flow voltage of the re-identified second node. This process continues until no second node can be identified in the continuously updated power distribution line, thus completing the installation and level setting of the voltage regulator.

[0088] In this embodiment, a series voltage regulator is installed at node B, with the lowest setting, thereby increasing the voltage regulator setting at node B and calculating the power flow voltage. Furthermore, when analyzing the power flow of the distribution line, the voltage regulator can be considered as a two-port network; in this case, the effect of the series voltage regulator on the line can be replaced by the Π-type equivalent circuit of the voltage regulator. For example... Figure 3 Neglecting the influence of the excitation branch, the non-ideal voltage regulator can be equivalent to an ideal transformer and its impedance. The Π-type equivalent circuit of this transformer can then be obtained. The impedance Z of the series voltage regulator can be obtained from the voltage regulator parameters.

[0089]

[0090] Among them, P k For the short-circuit loss of the voltage regulator, U k % represents the short-circuit impedance voltage of the voltage regulator, U 1n S is the rated line voltage on the primary side of the voltage regulator. n This refers to the rated capacity of the voltage regulator.

[0091] The effect of installing a series voltage regulator between nodes i and j on the admittance matrix is ​​as follows:

[0092]

[0093] In this embodiment, if the power flow voltage of the second node B is higher than the preset maximum voltage U upperIf the voltage at the second node B is too high, it indicates that the voltage regulator at node B needs to be lowered to the level before the previous increase. Then, the installation and adjustment of voltage regulators at other nodes in the distribution line that require voltage modulation should be performed. If the power flow voltage at the second node B is lower than the preset maximum voltage U... upper If the voltage regulator of the second node B can be raised to another level, then the power flow calculation of the current distribution line node is performed after the voltage regulator is raised to another level, so as to obtain the power flow voltage of the second node B after the voltage regulator is raised, until the power flow voltage obtained by the power flow calculation of the second node B after the voltage regulator level is determined is higher than the preset maximum voltage.

[0094] Preferably, the preset minimum allowable voltage U of the power distribution line lower The maximum permissible voltage U for a 10kV distribution line is preset. upper For 10kV, the minimum allowable power factor λ for the main distribution line. limit The preset target power factor λ after connecting a reactive power compensation device in parallel to the main line of a 10kV distribution line. set For 10kV, Q unit This refers to the unit capacity of the parallel reactive power compensation device.

[0095] Following the process in Example 1, a low-voltage mitigation scheme for a typical 10kV distribution network line in a remote rural area can be obtained. Preferably, a corresponding program is built in MATLAB for verification. Based on data from a remote rural line in Guangdong, the process begins as follows: Figure 2 Establish a single-line diagram, and based on the line parameters and load parameters, establish an admittance matrix. Optimize the configuration of parallel reactive power compensation devices and series voltage regulators for this line, including steps S1-S10:

[0096] S1: Obtain the target line network topology, line impedance parameters, and load parameters; determine the main line; draw a single-line diagram of a typical distribution network topology in a remote rural area; generate the initial line admittance matrix; calculate the initial power flow; and obtain the voltage of each node in the typical distribution network topology in a remote rural area.

[0097] S2: Based on the power flow calculation results, determine whether the minimum voltage of each node in the single-line diagram is less than U. lower If it is not less than, then proceed to S10.

[0098] S3: Calculate the power factor of the main node in the single-line diagram at this time, and determine whether the minimum power factor is less than φ. limit If it is not less than, then proceed to S6.

[0099] S4: Traverse backwards from the end of the main line to find the first node whose power factor is less than λ.limit Let the node be node A.

[0100] S5: Add a compensation capacity of Q to node A. unit For parallel reactive power compensation devices, calculate the power flow. If the power factor of node A is greater than λ... set If the condition is met, then re-enter S2; otherwise, re-enter S5.

[0101] S6: Traverse from the beginning of the main line backwards, find the last node whose voltage is higher than U. lower The node is designated as node B.

[0102] S7: Install a series voltage regulator for node B, and set the speed to the lowest speed.

[0103] S8: Increase the voltage regulator setting at node B, calculate the power flow, and if the voltage at node B is higher than U... upper If so, the voltage regulator at node B is lowered and the circuit enters S6.

[0104] S9: If the minimum voltage within the main trunk node is lower than U lower Re-enter S8.

[0105] S10: End.

[0106] The configuration results are shown in Table 1, and the configuration diagram is shown in Figure 4. White nodes represent low power factor devices, shaded nodes represent series voltage regulators, and gray nodes represent parallel reactive power compensation devices.

[0107] Table 1. Configuration of Low Voltage Problem Mitigation Devices

[0108]

[0109] Power flow calculations were performed again to obtain the voltage and power factor of each node on the main line during and after the mitigation process, as follows: Figure 5 , Figure 6 As shown, after installing the parallel reactive power compensation device, the line admittance matrix changes, the power flow changes, the power factor of each node in the line is significantly improved, and the voltage of each node increases slightly. At this time, the voltage amplitude of the main line after node 7 is less than the standard of 9.3kV. Therefore, when configuring the series voltage regulator, node 7 is selected. Compared with configuring it at node 5, the configuration capacity of the voltage regulator is reduced to a certain extent, while the adjustment range of the voltage regulator is expanded. If the line is longer or the load is larger, the number of series voltage regulators can be reduced.

[0110] Understandably, traditional low-voltage management device configuration methods do not fully utilize the power factor improvement and low-voltage management capabilities of reactive power compensation devices, failing to fully leverage their functions. This may result in excessive capacity configuration at some nodes within the distribution line, while the power factor at other nodes remains substandard. This invention establishes an equivalent admittance model for distribution lines in remote rural areas. Based on measured data of the lines, it fully utilizes the power flow improvement capabilities of reactive power compensation devices and combines this with the rational configuration of series voltage regulators to achieve economical and efficient management of low-voltage problems in distribution lines in remote rural areas, demonstrating significant engineering value.

[0111] Implementing the above embodiments has the following effects:

[0112] The technical solution of this invention obtains the target line network topology diagram, line impedance parameters, and load parameters to draw the topology diagram of the distribution network. Then, it performs power flow calculation on the generated admittance matrix to obtain the power flow voltage of each node in the distribution line. By combining the power flow voltage, the power factor of the node is calculated and determined. This invention can combine power flow voltage and power factor to optimize the configuration of reactive power compensation devices and voltage regulators for different nodes in the distribution line. After installing reactive power compensation devices and voltage regulators, the line admittance matrix changes, the power flow changes, the power factor of each node in the line is significantly improved, and the voltage of each node increases slightly. Compared with the prior art, this invention reduces the configuration capacity of voltage regulators to a certain extent, while expanding the adjustment range of voltage regulators.

[0113] Example 2

[0114] Please see Figure 7 The present invention provides a configuration device for a low-voltage device, comprising: a drawing module 201, a calculation module 202, a judgment module 203, a reactive power compensation device configuration module 204, and a voltage regulator configuration module 205.

[0115] The drawing module 201 is used to acquire and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters and load parameters.

[0116] The calculation module 202 is used to generate the admittance matrix of the distribution line according to the topology single-line diagram, and to perform power flow calculation on the admittance matrix to obtain the power flow voltage of each node in the distribution line.

[0117] The judgment module 203 is used to calculate the power factor of each node in the current power distribution line when the power flow voltage of a node in the power distribution line is less than the preset minimum voltage, and to determine whether there is a node whose power factor is less than the preset minimum power factor.

[0118] The reactive power compensation device configuration module 204 is used to determine a first node from the power distribution line according to the preset minimum power factor if there is a node with a power factor less than the preset minimum power factor, and use the first node as the installation node of the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, so as to complete the configuration of the reactive power compensation device.

[0119] The voltage regulator configuration module 205 is used to determine a second node from the power distribution line according to the preset minimum voltage if there is no node with a power factor less than the preset minimum power factor, and use the second node as the installation node of the voltage regulator. Then, after determining the voltage regulator's range, the power distribution line is updated, and the second node after the updated power distribution line is re-determined, and the voltage regulator's range is determined for the re-determined second node, thereby completing the configuration of the voltage regulator.

[0120] As a preferred embodiment, the method for calculating the power flow voltage at each node within the distribution line by performing power flow calculation on the admittance matrix is ​​as follows:

[0121] U = YI; where U represents the fundamental voltage of each node, Y represents the admittance matrix of the distribution line in the single-line diagram of the topology, and I represents the fundamental current injected into each node.

[0122] As a preferred embodiment, the method for calculating the power factor of each node of the current power distribution line is as follows:

[0123] Where, λ i Let u be the power factor of node i in the power distribution line. i Let u be the voltage at node i in the power distribution line. i-1 Let y be the voltage of the node preceding node i in the power distribution line. i-1,i Let i be the mutual admittance between node i-1 and node i.

[0124] As a preferred embodiment, determining the first node from the power distribution line based on the preset minimum power factor specifically involves:

[0125] Starting from the end of the power distribution line and moving backward, the first node whose power factor is less than the preset minimum power factor is identified as the first node.

[0126] As a preferred embodiment, the first node is used as the installation node for the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after updating the initial route, thus completing the configuration of the reactive power compensation device. Specifically:

[0127] The first node is designated as the installation node for the reactive power compensation device. The reactive power compensation device is then added to the first node in the power distribution line, thereby updating the power distribution line. Power flow calculations are performed on the updated power distribution line to obtain the power factor of the first node. If the power factor of the first node is less than a preset target power factor, reactive power compensation devices are added to the first node in the power distribution line, and power flow calculations are performed on the power distribution line after the addition of reactive power compensation devices to obtain the power factor of the first node again, until the power factor of the first node is greater than the preset target power factor. If the power factor of the first node is greater than the preset target power factor, the updated power distribution line is traversed backwards from its end. The first node with a power factor less than a preset minimum power factor is redefined as the first node, and reactive power compensation devices are added to the redefined first node. The power distribution line is then updated and power flow calculations are performed to obtain the power factor of the redefined first node, until no first node can be determined in the continuously updated power distribution line, thus completing the configuration of the reactive power compensation device.

[0128] As a preferred embodiment, determining the second node from the power distribution line based on the preset minimum voltage specifically involves:

[0129] Traverse the power distribution line from the beginning to the end, and determine the last node whose power flow voltage is less than the preset minimum voltage as the second node.

[0130] As a preferred embodiment, the second node is used as the installation node for the voltage regulator. Then, after determining the voltage regulator's range, the power distribution line is updated, and the second node after the updated power distribution line is re-determined. Finally, the voltage regulator's range is determined at the re-determined second node, thereby completing the voltage regulator configuration. Specifically:

[0131] The second node is used as the installation node for the voltage regulator. The voltage regulator is installed and its speed setting is configured on the first node within the power distribution line, thereby updating the power distribution line. The voltage regulator's speed setting is set to the lowest level. The voltage regulator's speed is then increased by one level, and power flow calculations are performed on the updated power distribution line to obtain the power flow voltage of the second node. If the power flow voltage of the second node is less than the preset maximum voltage, the voltage regulator's speed is increased by one level, and power flow calculations are performed on the updated power distribution line again to obtain the power flow voltage of the second node after the current increase in voltage regulator speed, until the power flow voltage obtained from the power flow calculation is greater than... The voltage regulator is set to a preset maximum voltage. When the power flow voltage of the second node is greater than the preset maximum voltage, the voltage regulator is lowered to the level before the previous increase. The power flow is then traversed backward from the end of the updated power distribution line. The node with the last power flow voltage less than the preset minimum voltage is re-identified as the second node. The voltage regulator is then installed and its level is set for the re-identified second node. The voltage regulator level is then increased by one level, and the power distribution line is updated and the power flow is calculated to obtain the power flow voltage of the re-identified second node. This process continues until no second node can be identified in the continuously updated power distribution line, thus completing the installation and level setting of the voltage regulator.

[0132] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0133] Implementing the above embodiments has the following effects:

[0134] The technical solution of this invention obtains the target line network topology diagram, line impedance parameters, and load parameters to draw the topology diagram of the distribution network. Then, it performs power flow calculation on the generated admittance matrix to obtain the power flow voltage of each node in the distribution line. By combining the power flow voltage, the power factor of the node is calculated and determined. This invention can combine power flow voltage and power factor to optimize the configuration of reactive power compensation devices and voltage regulators for different nodes in the distribution line. After installing reactive power compensation devices and voltage regulators, the line admittance matrix changes, the power flow changes, the power factor of each node in the line is significantly improved, and the voltage of each node increases slightly. Compared with the prior art, this invention reduces the configuration capacity of voltage regulators to a certain extent, while expanding the adjustment range of voltage regulators.

[0135] Example 3

[0136] Accordingly, the present invention also provides a terminal device, comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the configuration method of the low-voltage device as described in any of the above embodiments.

[0137] The terminal device in this embodiment includes a processor, a memory, and a computer program and computer instructions stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps described in Embodiment 1 above, for example... Figure 1 The steps S101 to S105 are shown. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described device embodiment, such as the judgment module 203.

[0138] For example, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device. For example, the judgment module 203 is used to calculate the power factor of each node in the current power distribution line when the power flow voltage of a node in the power distribution line is less than a preset minimum voltage, and to determine whether there is a node with a power factor less than a preset minimum power factor.

[0139] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. It may include more or fewer components than illustrated, or combine certain components, or different components. For example, the terminal device may also include input / output devices, network access devices, buses, etc.

[0140] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0141] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile terminal, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0142] Wherein, if the modules / units integrated in the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. Wherein, the computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0143] Example 4

[0144] Accordingly, the present invention also provides a computer-readable storage medium comprising a stored computer program, wherein, when the computer program is executed, it controls the device on which the computer-readable storage medium is located to perform the low-voltage device configuration method as described in any of the above embodiments.

[0145] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for configuring a low-voltage device, characterized in that, include: Obtain and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters, and load parameters; Based on the topology single-line diagram, the admittance matrix of the distribution line is generated, and power flow calculation is performed on the admittance matrix to obtain the power flow voltage of each node in the distribution line. When the power flow voltage of a node in a power distribution line is less than the preset minimum voltage, calculate the power factor of each node in the current power distribution line and determine whether there is a node whose power factor is less than the preset minimum power factor. If it exists, a first node is determined from the power distribution line according to the preset minimum power factor, and this first node is used as the installation node for the reactive power compensation device. The power distribution line is then updated, and a new first node is determined after the update, thus completing the configuration of the reactive power compensation device. Specifically, the process involves traversing backwards from the end of the power distribution line, identifying the first node with a power factor less than the preset minimum power factor as the first node; using this first node as the installation node for the reactive power compensation device, and adding the device to the first node in the power distribution line, thereby updating the power distribution line; power flow calculations are performed on the updated power distribution line to obtain the power factor of the first node; if the power factor of the first node is less than the preset target power factor, then... In the power distribution line, reactive power compensation devices are continuously added to the first node, and power flow calculations are performed on the power distribution line after the addition of reactive power compensation devices to obtain the power factor of the first node after the addition, until the power factor of the first node is greater than the preset target power factor; when the power factor of the first node is greater than the preset target power factor, the power distribution line is traversed backward from the end of the updated power distribution line, and the first node with a power factor less than the preset minimum power factor is re-determined as the first node, and reactive power compensation devices are added to the re-determined first node, and the power distribution line is updated and power flow calculations are performed to obtain the power factor of the re-determined first node, until the first node can no longer be determined in the continuously updated power distribution line, thereby completing the configuration of reactive power compensation devices; If it does not exist, a second node is determined from the power distribution line according to the preset minimum voltage, and the second node is used as the installation node of the voltage regulator. Then, the power distribution line is updated after the voltage regulator is determined, and the second node after the updated power distribution line is re-determined. The voltage regulator is then determined for the re-determined second node, thereby completing the configuration of the voltage regulator.

2. The configuration method of a low-voltage device as described in claim 1, characterized in that, The method for calculating the power flow voltage at each node within the distribution line by performing power flow calculation on the admittance matrix is ​​as follows: U=YI Where U represents the fundamental voltage of each node, Y represents the admittance matrix of the distribution line in the single-line diagram of the topology, and I represents the fundamental current injected into each node.

3. The configuration method of a low-voltage device as described in claim 1, characterized in that, The method for calculating the power factor of each node in the current power distribution line is as follows: Where λ is the power factor of node i in the distribution line. Let i be the voltage at each node i in the power distribution line. Let be the voltage of the node preceding node i in the power distribution line. Let be the mutual admittance between node i-1 and node i. Let be the power factor angle of node i.

4. The configuration method of a low-voltage device as described in claim 1, characterized in that, The step of determining the second node from the power distribution line based on the preset minimum voltage specifically involves: Traverse the power distribution line from the beginning to the end, and determine the last node whose power flow voltage is less than the preset minimum voltage as the second node.

5. The configuration method of a low-voltage device as described in claim 4, characterized in that, The process involves using the second node as the installation node for the voltage regulator, determining the voltage regulator's range, updating the power distribution line, re-determining the second node after the updated power distribution line, and determining the voltage regulator's range on the re-determined second node, thereby completing the voltage regulator configuration. Specifically: The second node is used as the installation node for the voltage regulator, and the voltage regulator is installed and its range is set in the power distribution line at the second node, thereby updating the power distribution line; wherein, the range of the voltage regulator is set to the lowest range; Increase the voltage regulator's setting by one level, perform power flow calculations on the updated power distribution line, and obtain the power flow voltage of the second node; If the power flow voltage of the second node is less than the preset maximum voltage, the voltage regulator level is increased by one level, and the power flow calculation is performed on the updated power distribution line to obtain the power flow voltage of the second node after the voltage regulator level is increased, until the power flow voltage obtained by the power flow calculation is greater than the preset maximum voltage. When the power flow voltage of the second node is greater than the preset maximum voltage, the voltage regulator is lowered to the level before the previous increase. Then, starting from the end of the updated power distribution line and moving backward, the node with the last power flow voltage less than the preset minimum voltage is re-identified as the second node. The voltage regulator is then installed and its level is set for the re-identified second node. The current voltage regulator level is then increased by one level, and the power distribution line is updated and power flow calculations are performed to obtain the power flow voltage of the re-identified second node. This process continues until no second node can be identified in the continuously updated power distribution line, thus completing the installation and level setting of the voltage regulator.

6. A configuration device for a low-voltage device, characterized in that, include: The module includes a drawing module, a calculation module, a judgment module, a reactive power compensation device configuration module, and a voltage regulator configuration module. The drawing module is used to acquire and draw a single-line topology diagram of the distribution network based on the target line network topology diagram, line impedance parameters, and load parameters. The calculation module is used to generate the admittance matrix of the distribution line according to the topology single-line diagram, and to perform power flow calculation on the admittance matrix to obtain the power flow voltage of each node in the distribution line. The judgment module is used to calculate the power factor of each node in the current power distribution line when the power flow voltage of a node in the power distribution line is less than the preset minimum voltage, and to determine whether there is a node whose power factor is less than the preset minimum power factor. The reactive power compensation device configuration module is used to determine a first node from the power distribution line based on the preset minimum power factor if there is a node with a power factor less than the preset minimum power factor. This first node is then used as the installation node for the reactive power compensation device, thereby updating the power distribution line and re-determining the first node after the update, thus completing the configuration of the reactive power compensation device. Specifically, the module traverses backwards from the end of the power distribution line, identifying the first node with a power factor less than the preset minimum power factor as the first node. This first node is used as the installation node for the reactive power compensation device, and the device is added to the power distribution line to update the line. Power flow calculations are performed on the updated power distribution line to obtain the power factor of the first node. When the power factor of the first node... If the power factor is less than the preset target power factor, then a reactive power compensation device is added to the first node in the power distribution line, and power flow calculation is performed on the power distribution line after the addition of the reactive power compensation device to obtain the power factor of the first node after the addition, until the power factor of the first node is greater than the preset target power factor; when the power factor of the first node is greater than the preset target power factor, then the power distribution line is traversed backward from the end of the updated power distribution line, and the first node with a power factor less than the preset minimum power factor is re-determined as the first node, and a reactive power compensation device is added to the re-determined first node, and then the power distribution line is updated and power flow calculation is performed to obtain the power factor of the re-determined first node, until the first node cannot be determined in the continuously updated power distribution line, thereby completing the configuration of the reactive power compensation device; The voltage regulator configuration module is used to determine a second node from the power distribution line based on the preset minimum voltage if there is no node with a power factor less than the preset minimum power factor, and to use the second node as the installation node of the voltage regulator. Then, the voltage regulator is configured by determining the voltage range and updating the power distribution line, re-determining the second node after updating the power distribution line, and determining the voltage regulator range on the re-determined second node.

7. A terminal device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the configuration method of the low-voltage device as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program; wherein, when the computer program is executed, it controls the device on which the computer-readable storage medium is located to perform the configuration method of the low-voltage device as described in any one of claims 1-5.

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