CN116526502A - Configuration method, device, equipment and storage medium of low-voltage device - Google Patents

Configuration method, device, equipment and storage medium of low-voltage device Download PDF

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Publication number
CN116526502A
CN116526502A CN202310538723.6A CN202310538723A CN116526502A CN 116526502 A CN116526502 A CN 116526502A CN 202310538723 A CN202310538723 A CN 202310538723A CN 116526502 A CN116526502 A CN 116526502A
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China
Prior art keywords
node
voltage
distribution line
power factor
power
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CN202310538723.6A
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Chinese (zh)
Inventor
金莉
马明
雷二涛
张浚坤
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Priority to CN202310538723.6A priority Critical patent/CN116526502A/en
Publication of CN116526502A publication Critical patent/CN116526502A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1871—Methods for planning installation of shunt reactive power compensators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a configuration method, a device, equipment and a storage medium of a low-voltage device, comprising the following steps: obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters; generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out power flow calculation on the admittance matrix to obtain power flow voltage of each node in the distribution line; when the tide voltage of the node in the distribution line is smaller than the preset minimum voltage, calculating the power factor of each node of the current distribution line, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not; if the reactive power compensation device exists, determining a first node from the distribution line according to the preset minimum power factor, and taking the first node as an installation node of the reactive power compensation device; and if the voltage regulator is not present, determining a second node from the distribution line according to the preset minimum voltage, and taking the second node as an installation node of the voltage regulator.

Description

Configuration method, device, equipment and storage medium of low-voltage device
Technical Field
The present invention relates to the field of low voltage management technologies of power distribution networks, and in particular, to a method, a device, an apparatus, and a storage medium for configuring a low voltage device.
Background
The improvement of the electrification degree of the industry in China, the stone products and timber products in remote rural areas are input into a large number of high-power motors such as crushers, planing machines, drilling machines and the like, the power factor of the distribution lines in remote rural areas is seriously influenced, and the energy loss is increased. Therefore, it is necessary to address the low voltage and high power loss issues of remote rural distribution lines. The low-voltage treatment device mainly comprises a series voltage regulator and a reactive power compensation device, and after the position of the series voltage regulator is determined, the reactive power compensation device is usually added to the series voltage regulator or the capacity and the position are empirically configured from the tail end of a line.
However, through research on the current distribution network line flow, it is found that both the active power flow and the reactive power flow in the distribution line can cause voltage drop on the line impedance, and the connection of the reactive power compensation device can only change the flow before the connection point, and the flow distribution after the connection point can not be improved, so that the configuration method of the traditional low-voltage treatment device does not fully utilize the capacity of the reactive power compensation device and the voltage regulator for improving the line power factor and treating the low voltage, and the functions of the reactive power compensation device can not be fully utilized, so that the configuration capacity of part of nodes in the distribution line is excessive, and the power factor of part of nodes still does not reach the standard.
Therefore, there is a need for a low voltage device configuration method that can reduce the device configuration capacity and comprehensively improve the power quality of the power distribution network.
Disclosure of Invention
The invention provides a configuration method, a device, equipment and a storage medium of a low-voltage device, which are used for solving the technical problems that the prior art does not fully utilize the capacity of a reactive compensation device for improving the power factor of a circuit and treating low voltage.
In order to solve the above technical problems, an embodiment of the present invention provides a method for configuring a low voltage device, including:
obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters;
generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out power flow calculation on the admittance matrix to obtain power flow voltage of each node in the distribution line;
when the tide voltage of the node in the distribution line is smaller than the preset minimum voltage, calculating the power factor of each node of the current distribution line, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not;
if the reactive compensation device exists, a first node is determined from the distribution line according to the preset minimum power factor, the first node is used as an installation node of the reactive compensation device, the distribution line is updated, the first node after the initial route is updated is redetermined, and therefore configuration of the reactive compensation device is completed.
If the voltage difference is not present, determining a second node from the distribution line according to the preset minimum voltage, taking the second node as an installation node of the voltage regulator, updating the distribution line after determining the gear of the voltage regulator, re-determining the second node after updating the distribution line, and determining the gear of the voltage regulator after re-determining the second node, thereby completing the configuration of the voltage regulator.
As a preferred solution, the calculating manner of the power flow voltage of each node in the distribution line by carrying out the power flow calculation on the admittance matrix is as follows:
U＝YI
wherein U represents fundamental wave voltage of each node, Y represents admittance matrix of distribution lines in the topological single line diagram, and I represents fundamental wave current injected by each node.
As a preferred scheme, the power factor calculation mode for calculating each node of the current distribution line is as follows:
wherein lambda is i For the power factor of each node i in the distribution line, u i For the voltage of each node i in the distribution line, u i-1 For the voltage of the node preceding node i in the distribution line, y i-1,i Is the transadmittance between node i-1 and node i.
Preferably, the determining a first node from the distribution line according to the preset minimum power factor specifically includes:
Traversing forward from the tail end of the distribution line, and determining a node with the first power factor smaller than the preset lowest power factor as a first node.
As a preferred solution, the first node is used as an installation node of the reactive power compensation device, so as to update the distribution line, and the first node after the initial route is updated is redetermined, thereby completing the configuration of the reactive power compensation device, specifically:
taking the first node as an installation node of the reactive power compensation device, and carrying out the addition and the allocation of the reactive power compensation device on the first node in the distribution line so as to update the distribution line;
carrying out load flow calculation on the updated distribution line to obtain the power factor of the first node;
when the power factor of the first node is smaller than a preset target power factor, continuously adding a reactive power compensation device to the first node in the distribution line, carrying out load flow calculation on the distribution line after continuously adding the reactive power compensation device, and obtaining the power factor of the first node after continuously adding until the power factor of the first node is larger than the preset target power factor;
when the power factor of the first node is larger than a preset target power factor, traversing forward from the tail end of the updated distribution line, re-determining the node with the first power factor smaller than the preset minimum power factor as the first node, adding the reactive compensation device to the re-determined first node, updating the distribution line and calculating the power flow to obtain the re-determined power factor of the first node until the first node cannot be determined in the distribution line after being updated continuously, and thus completing the configuration of the reactive compensation device.
Preferably, the determining a second node from the distribution line according to the preset minimum voltage specifically includes:
traversing backward from the head end of the distribution line, and determining a node with the last tide voltage smaller than the preset lowest voltage as a second node.
As a preferred solution, the second node is used as an installation node of the voltage regulator, and then the power distribution line is updated after the gear determination is performed on the voltage regulator, the second node after the power distribution line update is redetermined, and the gear determination is performed on the redetermined second node, so that the configuration of the voltage regulator is completed, specifically:
taking the second node as an installation node of the voltage regulator, and installing the voltage regulator and setting a gear of the first node in the distribution line, so as to update the distribution line; the gear of the voltage regulator is set to be the lowest gear;
raising the gear of the first-stage voltage regulator, and carrying out load flow calculation on the updated distribution line to obtain the load flow voltage of the second node;
when the power flow voltage of the second node is smaller than the preset highest voltage, continuously raising the gear of the first-stage voltage regulator, and then carrying out power flow calculation on the updated distribution line to obtain the power flow voltage of the second node after the gear of the voltage regulator is raised currently until the power flow voltage obtained by power flow calculation is larger than the preset highest voltage;
When the tide voltage of the second node is larger than the preset highest voltage, the voltage regulator is lowered to a gear before the voltage regulator is raised for the previous time, the last node with the tide voltage smaller than the preset lowest voltage is traversed forwards from the tail end of the updated distribution line, the last node is redetermined to be the second node, the installation and gear setting of the voltage regulator are carried out on the redetermined second node, the gear of the current voltage regulator is raised again, updating and tide calculation are carried out on the distribution line, the tide voltage of the redetermined second node is obtained, and the second node cannot be determined in the distribution line after the updating is carried out continuously, so that the installation and gear setting of the voltage regulator are completed.
Correspondingly, the invention also provides a configuration device of the low-voltage device, which comprises: the reactive compensation device comprises a drawing module, a calculation module, a judging module, a reactive compensation device configuration module and a voltage regulator configuration module;
the drawing module is used for obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters;
the calculation module is used for generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out power flow calculation on the admittance matrix to obtain power flow voltages of all nodes in the distribution line;
The judging module is used for calculating the power factor of each node of the current distribution line when the tidal current voltage of the node in the distribution line is smaller than the preset minimum voltage, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not;
and the reactive power compensation device configuration module is used for determining a first node from the distribution line according to the preset lowest power factor if the node with the power factor smaller than the preset lowest power factor exists, and taking the first node as an installation node of the reactive power compensation device, further updating the distribution line and redetermining the first node after the initial route is updated, thereby completing the configuration of the reactive power compensation device.
And the voltage regulator configuration module is used for determining a second node from the distribution circuit according to the preset minimum voltage if no node with the power factor smaller than the preset minimum power factor exists, taking the second node as an installation node of the voltage regulator, updating the distribution circuit after determining the gear of the voltage regulator, redetermining the second node after updating the distribution circuit, and determining the gear of the voltage regulator on the redetermined second node, thereby completing the configuration of the voltage regulator.
Correspondingly, the 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, the processor implementing the method for configuring a low voltage device according to any one of the above when executing the computer program.
Accordingly, the present invention also provides a computer-readable storage medium including a stored computer program; wherein the computer program, when run, controls an apparatus in which the computer-readable storage medium resides to perform the method of configuring a low voltage device as claimed in any one of the preceding claims.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the technical scheme, the topological graph of the power distribution network is drawn by acquiring the target line network frame topological graph, the line impedance parameters and the load parameters, and then the generated admittance matrix is subjected to load flow calculation to obtain the load flow voltage of each node in the power distribution line, so that the power factor of each node is calculated and judged by combining the load flow voltage, and the reactive power compensation device and the voltage regulator can be optimally configured for different nodes in the power distribution line by combining the load flow voltage and the power factor.
Drawings
Fig. 1: the embodiment of the invention provides a step flow chart of a configuration method of a low-voltage device;
fig. 2: the constructed topological single line diagram is provided for the embodiment of the invention;
fig. 3: the invention provides a schematic diagram of an n-type equivalent circuit;
fig. 4: the topology single line diagram is configured for the low-voltage problem management device provided by the embodiment of the invention;
fig. 5: schematic diagrams of voltage amplitude values of all nodes of the main line after voltage treatment are provided by the embodiment of the invention;
fig. 6: schematic diagrams of power factors of all nodes of the main line after voltage management are provided by the embodiment of the invention;
fig. 7: the embodiment of the invention provides a structural schematic diagram of a configuration device of a low-voltage device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a configuration method of a low voltage device according to an embodiment of the present invention includes steps S101 to S105:
s101: and obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters.
In this embodiment, the target line network frame topology map, the line impedance parameter and the load parameter are acquired, and then the line trunk line is determined, so that a topology single line map of the power distribution network is drawn through the determined line trunk line, and the constructed topology single line map is shown in fig. 2.
S102: and generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out load flow calculation on the admittance matrix to obtain load flow voltages of all nodes in the distribution line.
As a preferred solution of this embodiment, the calculating manner of the power flow voltage of each node in the distribution line by performing the power flow calculation on the admittance matrix is:
u=yi; wherein U represents fundamental wave voltage of each node, Y represents admittance matrix of distribution lines in the topological single line diagram, and I represents fundamental wave current injected by each node.
The method can be used for drawing a single line diagram of a typical topology of the power distribution network in the remote rural area, generating an admittance matrix Y of the power distribution line, and calculating initial power flow to obtain the voltage of each node in the typical topology of the power distribution network in the remote rural area.
In this embodiment, the voltage of each node in the line can be obtained by the power flow formula:
U＝YI (1)
where U is a matrix of n×1, and n is the number of total points of the model. U represents the fundamental voltage of each node, Y represents an n×n matrix, I represents an n×1 matrix, and Y represents the fundamental current injected by each node. The load flow calculation matrix can be expressed as:
wherein y is i,i Is the self admittance, y of the i node under the fundamental wave frequency of the model i,j The admittance of the node i to the node j at the fundamental frequency of the model is obtained.
S103: when the tidal current voltage of the node in the distribution line is smaller than the preset minimum voltage, calculating the power factor of each node of the current distribution line, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not.
As a preferred solution of this embodiment, the calculation manner for calculating the power factor of each node of the current distribution line is:
wherein lambda is i For the power factor of each node i in the distribution line, u i For the voltage of each node i in the distribution line, u i-1 For the voltage of the node preceding node i in the distribution line, y i-1,i Is the transadmittance between the node i-1 and the node i。
It can be understood that whether the lowest voltage of each node in the single line diagram is smaller than U is judged according to the calculation result of the calculated power flow lower If not, the node is described as not requiring low voltage regulation and control, and therefore no low voltage device configuration is required.
In this embodiment, the power factor of each node in the single-line diagram distribution line at this time is calculated, and it is determined whether the lowest power factor in each node is smaller than a preset lowest power factor Φ limit And further judging whether each node needs to be provided with a reactive compensation device or a voltage regulator.
S104: if the reactive compensation device exists, a first node is determined from the distribution line according to the preset minimum power factor, the first node is used as an installation node of the reactive compensation device, the distribution line is updated, the first node after the initial route is updated is redetermined, and therefore configuration of the reactive compensation device is completed.
It will be appreciated that due to the presence of a power factor less than the preset minimum power factor phi limit Therefore, the node is node equipment with low power factor, a parallel reactive compensation device is required to be externally added, the power of the node is compensated, so that the power of the node is improved, the treatment of electric energy quality is realized, the power flow improvement capability of the reactive compensation device is fully utilized, and the situations that the configuration capacity of part of nodes in a distribution line is excessive and the power factor of part of nodes still does not reach the standard are avoided.
As a preferred solution of this embodiment, the determining, according to the preset minimum power factor, the first node from the distribution line specifically includes:
traversing forward from the tail end of the distribution line, and determining a node with the first power factor smaller than the preset lowest power factor as a first node.
It should be noted that, since the reactive power compensation device is connected to only change the power flow before the access point, and the power flow distribution after the access point cannot be improved, it is necessary to traverse forward from the end of the distribution line, so as to sequentially advance from the end to the endDetermination of the first node. In this embodiment, the first node power factor is found to be less than the preset minimum power factor λ by traversing forward from the end of the distribution line l imit Is defined as the first node a.
As a preferred solution of this embodiment, the configuration of the reactive compensation device is completed by using the first node as an installation node of the reactive compensation device, further updating the distribution line, and redetermining the first node after updating the initial route, which specifically includes:
taking the first node as an installation node of the reactive power compensation device, and carrying out the addition and the allocation of the reactive power compensation device on the first node in the distribution line so as to update the distribution line; carrying out load flow calculation on the updated distribution line to obtain the power factor of the first node; when the power factor of the first node is smaller than a preset target power factor, continuously adding a reactive power compensation device to the first node in the distribution line, carrying out load flow calculation on the distribution line after continuously adding the reactive power compensation device, and obtaining the power factor of the first node after continuously adding until the power factor of the first node is larger than the preset target power factor; when the power factor of the first node is larger than a preset target power factor, traversing forward from the tail end of the updated distribution line, re-determining the node with the first power factor smaller than the preset minimum power factor as the first node, adding the reactive compensation device to the re-determined first node, updating the distribution line and calculating the power flow to obtain the re-determined power factor of the first node until the first node cannot be determined in the distribution line after being updated continuously, and thus completing the configuration of the reactive compensation device.
In this embodiment, a compensation capacity Q is added to the first node A unit The parallel reactive power compensation device of the system is used for calculating the power flow to obtain the power factor; if the power factor of the first node A is greater than the preset target power factor lambda set It is stated that the current first node a has already achieved compensation for the power factor, reaches the target power factor, and therefore it is necessary to determine other nodes in the distribution line,thereby determining whether other nodes need power compensation; if the power factor of the first node A is smaller than the preset target power factor lambda set And the current first node A does not realize the compensation of the power factor, and the first node A cannot reach the target power factor, so that the parallel reactive power compensation device needs to be continuously added until the first node A reaches the target power factor, and then whether other first nodes exist or not and whether the power compensation is needed or not are determined.
Installing a parallel reactive compensation device of capacity Q at node i is equivalent to connecting a load of reactance X in parallel to node i,
wherein U is the rated voltage of the parallel reactive power compensation device. The effect on the admittance matrix is:
wherein y is i i Indicating the self admittance of the distribution line node i.
S105: if the voltage difference is not present, determining a second node from the distribution line according to the preset minimum voltage, taking the second node as an installation node of the voltage regulator, updating the distribution line after determining the gear of the voltage regulator, re-determining the second node after updating the distribution line, and determining the gear of the voltage regulator after re-determining the second node, thereby completing the configuration of the voltage regulator.
It will be appreciated that, due to the absence of a power factor less than the preset minimum power factor phi limit The voltage of the node is smaller than the preset minimum voltage, so that the node needs to be regulated, the voltage is modulated by installing a series voltage regulator, the voltage of the node is improved, the treatment of the electric energy quality is realized, and the power flow improvement capability of the voltage regulator is fully utilized.
As a preferable solution of this embodiment, the determining, according to the preset minimum voltage, the second node from the distribution line specifically includes:
traversing backward from the head end of the distribution line, and determining a node with the last tide voltage smaller than the preset lowest voltage as a second node.
It should be noted that, since the voltage regulator is different from the reactive compensation device, in the process of determining the installation node of the voltage regulator, the voltage regulator may traverse backward from the head end of the distribution line, and determine the node where the last tidal voltage on the distribution line is less than the preset minimum voltage as the second node B.
As a preferred solution of this embodiment, the second node is used as an installation node of the voltage regulator, and further updates the distribution line after determining the gear of the voltage regulator, and redetermines the second node after updating the distribution line, and determines the gear of the voltage regulator for the redetermined second node, thereby completing the configuration of the voltage regulator, specifically including:
taking the second node as an installation node of the voltage regulator, and installing the voltage regulator and setting a gear of the first node in the distribution line, so as to update the distribution line; the gear of the voltage regulator is set to be the lowest gear; raising the gear of the first-stage voltage regulator, and carrying out load flow calculation on the updated distribution line to obtain the load flow voltage of the second node; when the power flow voltage of the second node is smaller than the preset highest voltage, continuously raising the gear of the first-stage voltage regulator, and then carrying out power flow calculation on the updated distribution line to obtain the power flow voltage of the second node after the gear of the voltage regulator is raised currently until the power flow voltage obtained by power flow calculation is larger than the preset highest voltage; when the tide voltage of the second node is larger than the preset highest voltage, the voltage regulator is lowered to a gear before the voltage regulator is raised for the previous time, the last node with the tide voltage smaller than the preset lowest voltage is traversed forwards from the tail end of the updated distribution line, the last node is redetermined to be the second node, the installation and gear setting of the voltage regulator are carried out on the redetermined second node, the gear of the current voltage regulator is raised again, updating and tide calculation are carried out on the distribution line, the tide voltage of the redetermined second node is obtained, and the second node cannot be determined in the distribution line after the updating is carried out continuously, so that the installation and gear setting of the voltage regulator are completed.
In this embodiment, a series voltage regulator is installed for the node B, and the gear is set to be the lowest gear, so as to raise the gear of the voltage regulator of the first-stage node B, and calculate the tide to obtain the tide voltage. Further, when analyzing the power flow of the distribution line, the voltage regulator can be regarded as a two-port network, and at the moment, the influence of the series voltage regulator on the line can be replaced by an n-type equivalent circuit of the voltage regulator. As shown in fig. 3, the influence of the exciting branch is not counted, the non-ideal voltage regulator can be equivalent to an ideal transformer and the impedance thereof, and then the pi-type equivalent circuit of the transformer can be obtained. The impedance Z of the series voltage regulator can be obtained by the parameters of the voltage regulator:
wherein P is k U, for voltage regulator short-circuit loss k % is the voltage regulator short-circuit impedance voltage, U 1n Is the rated line voltage of the primary side of the voltage regulator, S n Is the rated capacity of the voltage regulator.
The influence of the installation of the series voltage regulator between the nodes i and j on the admittance matrix is as follows:
in this embodiment, if the tidal current voltage of the second node B is higher than the preset maximum voltage U upper And the step of reducing the voltage regulator of the node B is needed to be reduced to the step of the step before the last rising, and then the installation and the step determination of the voltage regulator of the node which is additionally needed to be subjected to voltage modulation in the distribution line are carried out. If the tidal current voltage of the second node B is lower than the preset maximum voltage U upper Then the voltage regulation of the second node B is explainedThe gear of the device can be increased by one level, so that the gear based on the current voltage regulator can be increased by one level again, and the current power distribution line node is subjected to power flow calculation after the voltage regulator is increased by one level, so that the power flow voltage of the second node B after the voltage regulator is increased is obtained, and the power flow voltage obtained by power flow calculation after the voltage regulator gear determination is carried out by the second node B is higher than the preset highest voltage.
Preferably, the distribution line allows a preset minimum voltage U lower Preset highest voltage U allowed by distribution line at 10kV upper A preset minimum power factor lambda allowed by a distribution line main line of 10kV limit 10kV, a preset target power factor lambda after the distribution line main line is connected with a reactive power compensation device in parallel set 10kV, Q unit Is the unit capacity of the parallel reactive power compensation device.
According to the process of the first embodiment, a low-voltage treatment scheme of a 10kV typical line of the power distribution network in a remote rural area can be finally obtained. Preferably, a corresponding program is established in matlab for verification, based on data of a remote rural line in Guangdong, a single line diagram is firstly established as shown in fig. 2, an admittance matrix is established according to line parameters and load parameters, and the line is optimally configured with a parallel reactive compensation device and a series voltage regulator, comprising the following steps of S1-S10:
S1: obtaining a target line network frame topological graph, line impedance parameters and load parameters, determining a line trunk line, drawing a single line graph of a typical topology of a power distribution network in a remote rural area, generating an admittance matrix of an initial line, and calculating an initial power flow to obtain voltages of all nodes in the typical topology of the power distribution network in the remote rural area.
S2: judging whether the lowest voltage of each node in the single line diagram is smaller than U or not according to the calculated load flow calculation result lower If not, the process proceeds to S10.
S3: calculating the power factor of the trunk line node of the single line diagram at the moment, and judging whether the lowest power factor is smaller than phi limit If not, the process proceeds to S6.
S4: traversing forward from the end of the trunk to find the first node power factor less than lambda limit Is defined as node a.
S5: adding a compensation capacity Q to the node A unit The parallel reactive power compensation device of (1) calculates the power flow, if the power factor of the node A is larger than lambda set S2 is re-entered, otherwise S5 is re-entered.
S6: traversing backward from the head end of the main line to find out that the last node voltage is higher than U lower Is defined as node B.
S7: and installing a series voltage regulator for the node B, wherein the gear is set to be the lowest gear.
S8: raising the voltage regulator gear of the node B, calculating the power flow, if the voltage of the node B is higher than U upper The voltage regulator gear of the node B is lowered and the process proceeds to S6.
S9: if the minimum voltage in the trunk node is lower than U lower S8 is re-entered.
S10: and (5) ending.
The configuration results are shown in table 1, and the configuration schematic diagram is shown in fig. 4. The white node is low-power factor equipment, the shadow node is a series voltage regulator, and the gray node is a parallel reactive power compensation device.
TABLE 1 Low Voltage problem management device configuration
And carrying out load flow calculation again to obtain the voltage and power factors of each node of the main line in the treatment process and after treatment, wherein the voltage and power factors are shown in fig. 5 and 6. After the parallel reactive power compensation device is installed, the line admittance matrix is changed, the power flow is changed, the power factor of each node in the line is obviously improved, and the voltage of each node is slightly increased. At this point the main rail voltage amplitude after node 7 is less than the 9.3kV standard, so when configuring the series regulator, the voltage at node 7 is selected. Compared with the configuration at the node 5, the configuration capacity of the voltage regulator is reduced to a certain extent, the adjustment interval of the voltage regulator is enlarged, and if the line is longer or the load is larger, the number of the configuration of the series voltage regulator can be reduced.
It can be understood that the configuration method of the traditional low-voltage treatment device does not fully utilize the capacity of the reactive compensation device for improving the line power factor and treating the low voltage, and fails to fully utilize the functions of the reactive compensation device, so that the configuration capacity of partial nodes in the distribution line is excessive, and the power factor of partial nodes still does not reach the standard.
The implementation of the above embodiment has the following effects:
according to the technical scheme, the topological graph of the power distribution network is drawn by acquiring the target line network frame topological graph, the line impedance parameters and the load parameters, and then the generated admittance matrix is subjected to load flow calculation to obtain the load flow voltage of each node in the power distribution line, so that the power factor of the node is calculated and judged by combining the load flow voltage, and the reactive power compensation device and the voltage regulator can be optimally configured for different nodes in the power distribution line by combining the load flow voltage and the power factor.
Example two
Please refer to fig. 7, which illustrates a configuration apparatus of a low voltage device according to an embodiment of the present invention, including: the reactive compensation device comprises a drawing module 201, a calculating module 202, a judging module 203, a reactive compensation device configuration module 204 and a voltage regulator configuration module 205.
The drawing module 201 is configured to obtain and draw a topological single line diagram of the power distribution network according to the target line network frame topological graph, the line impedance parameter and the load parameter.
The calculation module 202 is configured to generate an admittance matrix of the distribution line according to the topological single line diagram, and perform load flow calculation on the admittance matrix to obtain load flow voltages of each node in the distribution line.
The judging module 203 is configured to calculate power factors of each node of the current distribution line when the tidal current voltage of the node in the distribution line is less than the preset minimum voltage, and judge whether a node with the power factor less than the preset minimum power factor exists.
The reactive compensation device configuration module 204 is configured to determine a first node from the distribution line according to a preset minimum power factor if there is a node with the power factor smaller than the preset minimum power factor, and take the first node as an installation node of the reactive compensation device, further update the distribution line, and redetermine the first node after updating the initial route, thereby completing configuration of the reactive compensation device.
The voltage regulator configuration module 205 is configured 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 smaller than the preset minimum power factor, and take the second node as an installation node of the voltage regulator, further update the power distribution line after determining a gear of the voltage regulator, redetermine the second node after updating the power distribution line, and determine the gear of the voltage regulator for the redetermined second node, thereby completing the configuration of the voltage regulator.
As a preferred solution, the calculating manner of the power flow voltage of each node in the distribution line by carrying out the power flow calculation on the admittance matrix is as follows:
u=yi; wherein U represents fundamental wave voltage of each node, Y represents admittance matrix of distribution lines in the topological single line diagram, and I represents fundamental wave current injected by each node.
As a preferred scheme, the power factor calculation mode for calculating each node of the current distribution line is as follows:
wherein lambda is i For the power factor of each node i in the distribution line, u i For the voltage of each node i in the distribution line, u i-1 For the voltage of the node preceding node i in the distribution line, y i-1,i Is the transadmittance between node i-1 and node i.
Preferably, the determining a first node from the distribution line according to the preset minimum power factor specifically includes:
traversing forward from the tail end of the distribution line, and determining a node with the first power factor smaller than the preset lowest power factor as a first node.
As a preferred solution, the first node is used as an installation node of the reactive power compensation device, so as to update the distribution line, and the first node after the initial route is updated is redetermined, thereby completing the configuration of the reactive power compensation device, specifically:
Taking the first node as an installation node of the reactive power compensation device, and carrying out the addition and the allocation of the reactive power compensation device on the first node in the distribution line so as to update the distribution line; carrying out load flow calculation on the updated distribution line to obtain the power factor of the first node; when the power factor of the first node is smaller than a preset target power factor, continuously adding a reactive power compensation device to the first node in the distribution line, carrying out load flow calculation on the distribution line after continuously adding the reactive power compensation device, and obtaining the power factor of the first node after continuously adding until the power factor of the first node is larger than the preset target power factor; when the power factor of the first node is larger than a preset target power factor, traversing forward from the tail end of the updated distribution line, re-determining the node with the first power factor smaller than the preset minimum power factor as the first node, adding the reactive compensation device to the re-determined first node, updating the distribution line and calculating the power flow to obtain the re-determined power factor of the first node until the first node cannot be determined in the distribution line after being updated continuously, and thus completing the configuration of the reactive compensation device.
Preferably, the determining a second node from the distribution line according to the preset minimum voltage specifically includes:
traversing backward from the head end of the distribution line, and determining a node with the last tide voltage smaller than the preset lowest voltage as a second node.
As a preferred solution, the second node is used as an installation node of the voltage regulator, and then the power distribution line is updated after the gear determination is performed on the voltage regulator, the second node after the power distribution line update is redetermined, and the gear determination is performed on the redetermined second node, so that the configuration of the voltage regulator is completed, specifically:
taking the second node as an installation node of the voltage regulator, and installing the voltage regulator and setting a gear of the first node in the distribution line, so as to update the distribution line; the gear of the voltage regulator is set to be the lowest gear; raising the gear of the first-stage voltage regulator, and carrying out load flow calculation on the updated distribution line to obtain the load flow voltage of the second node; when the power flow voltage of the second node is smaller than the preset highest voltage, continuously raising the gear of the first-stage voltage regulator, and then carrying out power flow calculation on the updated distribution line to obtain the power flow voltage of the second node after the gear of the voltage regulator is raised currently until the power flow voltage obtained by power flow calculation is larger than the preset highest voltage; when the tide voltage of the second node is larger than the preset highest voltage, the voltage regulator is lowered to a gear before the voltage regulator is raised for the previous time, the last node with the tide voltage smaller than the preset lowest voltage is traversed forwards from the tail end of the updated distribution line, the last node is redetermined to be the second node, the installation and gear setting of the voltage regulator are carried out on the redetermined second node, the gear of the current voltage regulator is raised again, updating and tide calculation are carried out on the distribution line, the tide voltage of the redetermined second node is obtained, and the second node cannot be determined in the distribution line after the updating is carried out continuously, so that the installation and gear setting of the voltage regulator are completed.
It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding process in the foregoing method embodiment for the specific working process of the above-described apparatus, which is not described herein again.
The implementation of the above embodiment has the following effects:
according to the technical scheme, the topological graph of the power distribution network is drawn by acquiring the target line network frame topological graph, the line impedance parameters and the load parameters, and then the generated admittance matrix is subjected to load flow calculation to obtain the load flow voltage of each node in the power distribution line, so that the power factor of the node is calculated and judged by combining the load flow voltage, and the reactive power compensation device and the voltage regulator can be optimally configured for different nodes in the power distribution line by combining the load flow voltage and the power factor.
Example III
Correspondingly, the 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, the processor implementing the method of configuring a low voltage device as in any one of the embodiments above when the computer program is executed.
The terminal device of this embodiment includes: a processor, a memory, a computer program stored in the memory and executable on the processor, and computer instructions. The processor, when executing the computer program, implements the steps of the first embodiment described above, such as steps S101 to S105 shown in fig. 1. Alternatively, the processor may implement the functions of the modules/units in the above-described device embodiments when executing the computer program, for example, the determining module 203.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program in the terminal device. For example, the determining module 203 is configured to calculate, when the tidal current voltage of the node in the distribution line is less than the preset minimum voltage, the power factor of each node in the distribution line, and determine whether there is a node with a power factor less than the preset minimum power factor.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of the terminal device, and may include more or less components than illustrated, or may combine some components, or different components, e.g., the terminal device may further include an input-output device, a network access device, a bus, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.
The memory may be used to store the computer program and/or the module, and the processor may implement various functions of the terminal device by running or executing the computer program and/or the module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to 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 a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the terminal device integrated modules/units may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as stand alone products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
Example IV
Correspondingly, the invention further provides a computer readable storage medium, which comprises a stored computer program, wherein the computer program is used for controlling equipment where the computer readable storage medium is located to execute the configuration method of the low-voltage device according to any embodiment.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. A method of configuring a low voltage device, comprising:
obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters;
generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out power flow calculation on the admittance matrix to obtain power flow voltage of each node in the distribution line;
When the tide voltage of the node in the distribution line is smaller than the preset minimum voltage, calculating the power factor of each node of the current distribution line, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not;
if the power distribution line exists, a first node is determined from the power distribution line according to the preset minimum power factor, the first node is used as an installation node of the reactive compensation device, the power distribution line is updated, the first node after the initial route is updated is redetermined, and therefore configuration of the reactive compensation device is completed;
if the voltage difference is not present, determining a second node from the distribution line according to the preset minimum voltage, taking the second node as an installation node of the voltage regulator, updating the distribution line after determining the gear of the voltage regulator, re-determining the second node after updating the distribution line, and determining the gear of the voltage regulator after re-determining the second node, thereby completing the configuration of the voltage regulator.
2. The method for configuring a low voltage device according to claim 1, wherein the calculating manner of the power flow voltage of each node in the distribution line by performing the power flow calculation on the admittance matrix is:
U＝YI
Wherein U represents fundamental wave voltage of each node, Y represents admittance matrix of distribution lines in the topological single line diagram, and I represents fundamental wave current injected by each node.
3. The method for configuring a low voltage device according to claim 1, wherein the calculating means for calculating the power factor of each node of the current distribution line is as follows:
wherein lambda is i For the power factor of each node i in the distribution line, u i For the voltage of each node i in the distribution line, u i-1 For the voltage of the node preceding node i in the distribution line, y i-1,i Is the transadmittance between node i-1 and node i.
4. The method for configuring a low voltage device according to claim 1, wherein the determining a first node from the distribution line according to the preset minimum power factor comprises:
traversing forward from the tail end of the distribution line, and determining a node with the first power factor smaller than the preset lowest power factor as a first node.
5. The method for configuring a low voltage device according to claim 4, wherein the first node is used as an installation node of the reactive compensation device, so as to update the distribution line, and the first node after the initial route is updated is redetermined, so as to complete the configuration of the reactive compensation device, specifically:
Taking the first node as an installation node of the reactive power compensation device, and carrying out the addition and the allocation of the reactive power compensation device on the first node in the distribution line so as to update the distribution line;
carrying out load flow calculation on the updated distribution line to obtain the power factor of the first node;
when the power factor of the first node is smaller than a preset target power factor, continuously adding a reactive power compensation device to the first node in the distribution line, carrying out load flow calculation on the distribution line after continuously adding the reactive power compensation device, and obtaining the power factor of the first node after continuously adding until the power factor of the first node is larger than the preset target power factor;
when the power factor of the first node is larger than a preset target power factor, traversing forward from the tail end of the updated distribution line, re-determining the node with the first power factor smaller than the preset minimum power factor as the first node, adding the reactive compensation device to the re-determined first node, updating the distribution line and calculating the power flow to obtain the re-determined power factor of the first node until the first node cannot be determined in the distribution line after being updated continuously, and thus completing the configuration of the reactive compensation device.
6. The method for configuring a low voltage device according to claim 1, wherein the determining a second node from the distribution line according to the preset minimum voltage is specifically:
traversing backward from the head end of the distribution line, and determining a node with the last tide voltage smaller than the preset lowest voltage as a second node.
7. The method for configuring a low voltage device according to claim 6, wherein the second node is used as an installation node of the voltage regulator, the power distribution line is updated after the voltage regulator is determined in gear, the second node after the power distribution line is updated is redetermined, and the voltage regulator gear is determined for the redetermined second node, so that the configuration of the voltage regulator is completed, specifically:
taking the second node as an installation node of the voltage regulator, and installing the voltage regulator and setting a gear of the first node in the distribution line, so as to update the distribution line; the gear of the voltage regulator is set to be the lowest gear;
raising the gear of the first-stage voltage regulator, and carrying out load flow calculation on the updated distribution line to obtain the load flow voltage of the second node;
When the power flow voltage of the second node is smaller than the preset highest voltage, continuously raising the gear of the first-stage voltage regulator, and then carrying out power flow calculation on the updated distribution line to obtain the power flow voltage of the second node after the gear of the voltage regulator is raised currently until the power flow voltage obtained by power flow calculation is larger than the preset highest voltage;
when the tide voltage of the second node is larger than the preset highest voltage, the voltage regulator is lowered to a gear before the voltage regulator is raised for the previous time, the last node with the tide voltage smaller than the preset lowest voltage is traversed forwards from the tail end of the updated distribution line, the last node is redetermined to be the second node, the installation and gear setting of the voltage regulator are carried out on the redetermined second node, the gear of the current voltage regulator is raised again, updating and tide calculation are carried out on the distribution line, the tide voltage of the redetermined second node is obtained, and the second node cannot be determined in the distribution line after the updating is carried out continuously, so that the installation and gear setting of the voltage regulator are completed.
8. A low voltage device configuration apparatus, comprising: the reactive compensation device comprises a drawing module, a calculation module, a judging module, a reactive compensation device configuration module and a voltage regulator configuration module;
The drawing module is used for obtaining and drawing a topological single line diagram of the power distribution network according to the target line net rack topological graph, the line impedance parameters and the load parameters;
the calculation module is used for generating an admittance matrix of the distribution line according to the topological single line diagram, and carrying out power flow calculation on the admittance matrix to obtain power flow voltages of all nodes in the distribution line;
the judging module is used for calculating the power factor of each node of the current distribution line when the tidal current voltage of the node in the distribution line is smaller than the preset minimum voltage, and judging whether the node with the power factor smaller than the preset minimum power factor exists or not;
the reactive power compensation device configuration module is used for determining a first node from the distribution line according to the preset lowest power factor if the node with the power factor smaller than the preset lowest power factor exists, and taking the first node as an installation node of the reactive power compensation device, further updating the distribution line and redetermining the first node after the initial route is updated, so that the configuration of the reactive power compensation device is completed;
and the voltage regulator configuration module is used for determining a second node from the distribution circuit according to the preset minimum voltage if no node with the power factor smaller than the preset minimum power factor exists, taking the second node as an installation node of the voltage regulator, updating the distribution circuit after determining the gear of the voltage regulator, redetermining the second node after updating the distribution circuit, and determining the gear of the voltage regulator on the redetermined second node, thereby completing the configuration of the voltage regulator.
9. A terminal device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method of configuring a low voltage apparatus according to any one of claims 1-7 when the computer program is executed.
10. A computer readable storage medium, wherein the computer readable storage medium comprises a stored computer program; wherein the computer program, when run, controls an apparatus in which the computer readable storage medium is located to perform the method of configuring a low voltage device according to any one of claims 1-7.
CN202310538723.6A 2023-05-12 2023-05-12 Configuration method, device, equipment and storage medium of low-voltage device Pending CN116526502A (en)

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