CN116681471A - Direct current line address selection method and related device of alternating current-direct current system - Google Patents

Direct current line address selection method and related device of alternating current-direct current system Download PDF

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CN116681471A
CN116681471A CN202310705965.XA CN202310705965A CN116681471A CN 116681471 A CN116681471 A CN 116681471A CN 202310705965 A CN202310705965 A CN 202310705965A CN 116681471 A CN116681471 A CN 116681471A
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direct current
admittance
node
characteristic
input
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白浩
王扬
李巍
付宇
徐敏
肖小兵
刘通
宋子宏
杨炜晨
熊楠
要若天
陈青
叶升言
李新皓
阳浩
何肖蒙
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CSG Electric Power Research Institute
Guizhou Power Grid Co Ltd
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Guizhou Power Grid Co Ltd
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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
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Abstract

The application discloses a direct current line site selection method and a related device of an alternating current-direct current system, wherein the method comprises the following steps: selecting a plurality of groups of direct current falling points to form a direct current falling point set; constructing a direct current line between an input node and an output node based on preset transmission power; calculating the admittance of power characteristics of two ends according to preset transmission power, the first end voltage of an input node and the second end voltage of an output node; calculating the minimum characteristic value of an equivalent admittance matrix of the AC/DC system network, determining the node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end; and calculating the address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the maximum address selection parameters as the optimal address selection scheme. The application can solve the technical problem that the address selection result lacks reliability and accuracy because the influence of static voltage stability on direct current line address selection is not considered in the prior art.

Description

Direct current line address selection method and related device of alternating current-direct current system
Technical Field
The application relates to the technical field of alternating current and direct current systems, in particular to a direct current line address selection method and a related device of an alternating current and direct current system.
Background
With the development of the dc technology, the ac-dc hybrid distribution network is a trend of future development, and in this context, how to determine the geographic position of the dc line in the existing ac system is very important. The existing direct current line address selection methods can be divided into two types, one type is mainly based on the economic benefit of the direct current system as a primary target, and the direct current line address selection method is focused on direct current, such as a direct current address selection method based on network theory; the other type is a site selection method which considers the coordination of direct current and the existing alternating current network so as to optimize the overall economic benefit, for example, consider the active and reactive power regulation requirements of the alternating current.
However, in the existing direct current address selection method, the influence of static voltage stability on the address selection result is not considered, and the static voltage stability analysis is applied to an alternating current system; therefore, the current direct current line address scheme is not perfect according to the basis, and cannot reflect the characteristics of an actual alternating current-direct current system.
Disclosure of Invention
The application provides a direct current line address selection method and a related device of an alternating current-direct current system, which are used for solving the technical problem that the address selection result lacks reliability and accuracy because the influence of static voltage stability on direct current line address selection is not considered in the prior art.
In view of the above, the first aspect of the present application provides a method for selecting a direct current line of an ac/dc system, comprising:
selecting a plurality of groups of direct current falling points to form a direct current falling point set, wherein each group of direct current falling points comprises an input node and an output node;
constructing a direct current line between the input node and the output node based on preset transmission power;
calculating the characteristic admittance of the input end and the characteristic admittance of the output end according to the preset transmission power, the first end voltage of the input node and the second end voltage of the output node respectively;
calculating a minimum characteristic value of an equivalent admittance matrix of an alternating-current/direct-current system network, determining node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end;
and calculating the address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the largest address selection parameters as the optimal address selection scheme.
Preferably, the setting up a direct current line between the input node and the output node based on a preset transmission power further includes:
the reactive power demand of the converter stations at the two ends of the direct current line is configured according to preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
Preferably, the calculating the input end characteristic admittance and the output end characteristic admittance according to the preset transmission power, the first end voltage of the input node and the second end voltage of the output node respectively further includes:
and respectively acquiring the first end voltage of the input node and the second end voltage of the output node.
Preferably, the calculating the minimum eigenvalue of the network equivalent admittance matrix of the ac-dc system, and determining the node sensitivity according to the minimum eigenvalue, further includes:
constructing an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
The second aspect of the present application provides a direct current line address selecting device of an alternating current-direct current system, comprising:
the system comprises a falling point selecting unit, a direct current falling point selecting unit and a direct current falling point selecting unit, wherein the falling point selecting unit is used for selecting a plurality of groups of direct current falling points to form a direct current falling point set, and each group of direct current falling points comprises an input node and an output node;
the circuit building unit is used for building a direct current circuit between the input node and the output node based on preset transmission power;
an admittance calculating unit, configured to calculate an input end characteristic admittance and an output end characteristic admittance according to the preset transmission power, the first end voltage of the input node, and the second end voltage of the output node, respectively;
the parameter calculation unit is used for calculating the minimum characteristic value of an equivalent admittance matrix of the AC-DC system network, determining the node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end;
and the address selection analysis unit is used for calculating address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the largest address selection parameters as the optimal address selection scheme.
Preferably, the method further comprises:
the reactive power configuration unit is used for configuring reactive power demand of the converter stations at the two ends of the direct current line according to preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
Preferably, the method further comprises:
and the voltage acquisition unit is used for respectively acquiring the first end voltage of the input node and the second end voltage of the output node.
Preferably, the method further comprises:
an admittance matrix construction unit for constructing an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
The third aspect of the application provides a direct current line address selecting device of an alternating current-direct current system, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the dc link addressing method of the ac-dc system according to the first aspect according to the instruction in the program code.
A fourth aspect of the present application provides a computer readable storage medium storing program code for executing the dc line addressing method of the ac-dc system according to the first aspect.
From the above technical solutions, the embodiment of the present application has the following advantages:
the application provides a direct current line address selection method of an alternating current-direct current system, which comprises the following steps: selecting a plurality of groups of direct current falling points to form a direct current falling point set, wherein each group of direct current falling points comprises an input node and an output node; constructing a direct current line between an input node and an output node based on preset transmission power; respectively calculating the characteristic admittance of the input end and the characteristic admittance of the output end according to preset transmission power, the first end voltage of the input node and the second end voltage of the output node; calculating the minimum characteristic value of an equivalent admittance matrix of the AC/DC system network, determining the node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end; and calculating the address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the maximum address selection parameters as the optimal address selection scheme.
According to the direct current line address selection method of the alternating current-direct current system, parameter calculation and analysis are carried out on direct current landing points according to indexes such as minimum characteristic values and sensitivity for expressing static voltage stability, address selection parameters corresponding to different direct current landing point groups are obtained, and then the optimal address selection scheme is selected based on the address selection parameters; in the process, the influence of static voltage stability on direct current line address selection is fully considered, and the method is more in line with the actual situation of an alternating current-direct current system, so that the reliability and the accuracy of the optimal address scheme can be ensured. Therefore, the application can solve the technical problem that the address selection result lacks reliability and accuracy because the influence of static voltage stability on direct current line address selection is not considered in the prior art.
Drawings
Fig. 1 is a schematic flow chart of a direct current line address selection method of an alternating current-direct current system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a direct current line address selecting device of an ac/dc system according to an embodiment of the present application;
fig. 3 is a schematic diagram of a dc link access distribution network according to an embodiment of the present application;
fig. 4 is a schematic diagram of a system structure of a dc link access distributed energy distribution network according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
For easy understanding, referring to fig. 1, an embodiment of a method for selecting a direct current line of an ac/dc system according to the present application includes:
step 101, selecting a plurality of groups of direct current falling points to form a direct current falling point set, wherein each group of direct current falling points comprises an input node and an output node.
The direct current drop points refer to nodes capable of building direct current lines, and generally two nodes are required to complete the building of the direct current lines, so that each group of direct current drop points comprises an input node and an output node. Referring to fig. 3, an input node may be defined as node a and an output node may be defined as node b.
Step 102, setting up a direct current line between an input node and an output node based on preset transmission power.
Further, step 102 further includes:
the reactive power demand of converter stations at two ends of the direct current line is configured according to preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
It can be appreciated that the preset transmission power can be based on the actual situationThe situation setting is not limited herein, and the preset transmission power in this embodiment is defined as Δp ab A transmission power which is a preset transmission power delta P can be set up between the input node a and the output node b ab The dc link of (2) means that power flows from the power distribution network into the dc link and then flows out to the power distribution network via the dc link.
Reactive power demand is configured for the converter stations at both ends of the direct current line and is defined as delta Q ab And DeltaQ ab ＝0.1ΔP ab Meanwhile, reactive compensation devices are required to be additionally arranged at two ends, and the reactive compensation capacity is expressed as Q c And reactive compensation capacity Q c Always equal to the reactive demand Δq of the converter station ab 。
Step 103, calculating the characteristic admittance of the input end and the characteristic admittance of the output end according to the preset transmission power, the first end voltage of the input node and the second end voltage of the output node respectively.
Further, step 103, further includes:
the first terminal voltage of the input node and the second terminal voltage of the output node are respectively collected.
Referring to fig. 3, a first terminal voltage V of the input node a can be collected on the line a And a second terminal voltage V of the output node b b . In addition, the line admittance y of the alternating current line between the input node a and the output node b can be obtained ab The method comprises the steps of carrying out a first treatment on the surface of the The relevant parameters required for some calculations may be obtained as needed, and are not limited in this particular context.
The end characteristic admittance calculating process in this embodiment is a process of equivalent power characteristics at two ends of the dc line to admittances, that is, the end characteristic admittance is the power characteristic admittance, and the specific calculating process is expressed as:
wherein Δy aa For input characteristic admittance, Δy bb Is the output characteristic admittance.
And 104, calculating a minimum characteristic value of an equivalent admittance matrix of the AC-DC system, determining the node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end.
Further, step 104, before further includes:
constructing an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
The admittance matrix of the alternating current network of the power distribution network is expressed as Y, and the characteristic admittance delta Y of the input terminal is accessed at the input node a in consideration of the direct current line aa The output characteristic admittance deltay is accessed at the output node b bb Then, the network equivalent admittance matrix may be constructed as:
wherein Y is ac/dc I.e. the network equivalent admittance matrix.
The network equivalent admittance matrix Y can be directly calculated ac/dc Minimum feature value ρ of (2) min Then according to the minimum feature value ρ min Node sensitivities of the input node a and the output node b are calculated:
wherein, gamma aa For the node sensitivity of input node a, γ bb The node sensitivity of the output node b.
And 105, calculating the address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the maximum address selection parameters as the optimal address selection scheme.
The calculation process of the addressing parameter can be expressed as:
β＝γ aa Δy aa +γ bb Δy bb
wherein, beta is the addressing parameter. It can be understood that each group of DC drop points and the corresponding DC lines can calculate an addressing parameter beta, the addressing parameters of the addressing schemes are arranged in descending order, and the first largest addressing parameter beta max The scheme formed by the corresponding direct current drop point and the direct current line is the optimal address scheme.
For ease of understanding, referring to fig. 4, in a specific application example, nodes 11/12/13/14 in a 14-node system are respectively connected to distributed energy sources with capacity of 0.5p.u., a fixed-power transmission type dc line with Δp=0.3p.u. is connected between the node 1 and the node 14, the node 14 is a dc line inflow end, and the node 1 is a dc line outflow end. The calculation results of the impedance modulus indexes before and after the direct current line is connected are shown in table 1.
TABLE 1 analysis of the influence of DC line access on a distribution network System
As can be seen from table 1, after the dc line is connected, the impedance modulus index of each grid-connected node is increased, the static voltage stability of the system is improved, and the index improvement at the node 14 is most obvious, so that the dc line should be connected to the node 14.
The application example shows that the addressing scheme provided by the application not only can consider the influence of the static voltage stability related index, but also can consider direct current line addressing of a distribution network system with more complexity such as distributed energy sources; the prior art not only does not consider the constraint of static voltage stability, but also mainly researches factors such as a power change range, a branch power operation limit value, power backflow prevention, node power balance, minimum investment and the like, and obviously cannot adapt to research and analysis of a power distribution network system accessed by the current distributed energy sources.
According to the direct current line address selection method of the alternating current-direct current system, which is provided by the embodiment of the application, the direct current landing points are subjected to parameter calculation and analysis on indexes such as the minimum characteristic value and the sensitivity for expressing the stability of the static voltage, the address selection parameters corresponding to different direct current landing point groups are obtained, and then the optimal address selection scheme is selected based on the address selection parameters; in the process, the influence of static voltage stability on direct current line address selection is fully considered, and the method is more in line with the actual situation of an alternating current-direct current system, so that the reliability and the accuracy of the optimal address scheme can be ensured. Therefore, the embodiment of the application can solve the technical problem that the address selection result lacks reliability and accuracy because the influence of static voltage stability on direct current line address selection is not considered in the prior art.
For easy understanding, referring to fig. 2, the present application provides an embodiment of a dc line addressing device of an ac-dc system, including:
the drop point selecting unit 201 is configured to select multiple groups of direct current drop points to form a direct current drop point set, where each group of direct current drop points includes an input node and an output node;
a line construction unit 202, configured to construct a direct current line between an input node and an output node based on a preset transmission power;
an admittance calculating unit 203, configured to calculate an input terminal characteristic admittance and an output terminal characteristic admittance according to a preset transmission power, a first terminal voltage of an input node, and a second terminal voltage of an output node, respectively;
the parameter calculation unit 204 is configured to calculate a minimum feature value of an ac/dc system network equivalent admittance matrix, determine node sensitivity according to the minimum feature value, and construct the network equivalent admittance matrix based on the input end characteristic admittance and the output end characteristic admittance;
the address analysis unit 205 is configured to calculate an address parameter according to the node sensitivity, the input end characteristic admittance, and the output end characteristic admittance, and select an input node and an output node corresponding to the largest address parameter as the optimal address scheme.
Further, the method further comprises the following steps:
the reactive power configuration unit 206 is configured to configure reactive power demand of converter stations at two ends of the direct current line according to a preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
Further, the method further comprises the following steps:
the voltage acquisition unit 207 is configured to acquire a first terminal voltage of the input node and a second terminal voltage of the output node, respectively.
Further, the method further comprises the following steps:
an admittance matrix construction unit 208, configured to construct an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
The application provides direct current line address selecting equipment of an alternating current-direct current system, which comprises a processor and a memory, wherein the processor is used for storing the direct current line address selecting equipment;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute the dc line addressing method of the ac-dc system in the method embodiment according to the instruction in the program code.
The application provides a computer readable storage medium for storing program code for executing the direct current line addressing method of the alternating current-direct current system in the embodiment of the method.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for executing all or part of the steps of the method according to the embodiments of the present application by means of a computer device (which may be a personal computer, a server, or a network device, etc.). And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A direct current line address selecting method of an alternating current-direct current system is characterized by comprising the following steps:
selecting a plurality of groups of direct current falling points to form a direct current falling point set, wherein each group of direct current falling points comprises an input node and an output node;
constructing a direct current line between the input node and the output node based on preset transmission power;
calculating the characteristic admittance of the input end and the characteristic admittance of the output end according to the preset transmission power, the first end voltage of the input node and the second end voltage of the output node respectively;
calculating a minimum characteristic value of an equivalent admittance matrix of an alternating-current/direct-current system network, determining node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end;
and calculating the address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the largest address selection parameters as the optimal address selection scheme.
2. The method for direct current line location of an ac/dc system according to claim 1, wherein the setting up a direct current line between the input node and the output node based on a preset transmission power, further comprises:
the reactive power demand of the converter stations at the two ends of the direct current line is configured according to preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
3. The method for direct current line location selection of an ac/dc system according to claim 1, wherein the calculating the input terminal characteristic admittance and the output terminal characteristic admittance according to the preset transmission power, the first terminal voltage of the input node, and the second terminal voltage of the output node respectively further comprises:
and respectively acquiring the first end voltage of the input node and the second end voltage of the output node.
4. The method for direct current line location of an ac/dc system according to claim 1, wherein the calculating the minimum eigenvalue of the network equivalent admittance matrix of the ac/dc system and determining the node sensitivity according to the minimum eigenvalue further comprises:
constructing an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
5. A direct current line site selection apparatus of an alternating current-direct current system, comprising:
the system comprises a falling point selecting unit, a direct current falling point selecting unit and a direct current falling point selecting unit, wherein the falling point selecting unit is used for selecting a plurality of groups of direct current falling points to form a direct current falling point set, and each group of direct current falling points comprises an input node and an output node;
the circuit building unit is used for building a direct current circuit between the input node and the output node based on preset transmission power;
an admittance calculating unit, configured to calculate an input end characteristic admittance and an output end characteristic admittance according to the preset transmission power, the first end voltage of the input node, and the second end voltage of the output node, respectively;
the parameter calculation unit is used for calculating the minimum characteristic value of an equivalent admittance matrix of the AC-DC system network, determining the node sensitivity according to the minimum characteristic value, and constructing the equivalent admittance matrix of the network based on the characteristic admittance of the input end and the characteristic admittance of the output end;
and the address selection analysis unit is used for calculating address selection parameters according to the node sensitivity, the input end characteristic admittance and the output end characteristic admittance, and selecting the input node and the output node corresponding to the largest address selection parameters as the optimal address selection scheme.
6. The direct current line location apparatus of an alternating current-direct current system according to claim 5, further comprising:
the reactive power configuration unit is used for configuring reactive power demand of the converter stations at the two ends of the direct current line according to preset transmission power;
and configuring a corresponding reactive power compensation device according to the reactive power demand.
7. The direct current line location apparatus of an alternating current-direct current system according to claim 5, further comprising:
and the voltage acquisition unit is used for respectively acquiring the first end voltage of the input node and the second end voltage of the output node.
8. The direct current line location apparatus of an alternating current-direct current system according to claim 5, further comprising:
an admittance matrix construction unit for constructing an admittance matrix of an alternating current network of the power distribution network;
and constructing a network equivalent admittance matrix of the AC/DC system according to the AC network admittance matrix, the input end characteristic admittance and the output end characteristic admittance.
9. A direct current line addressing device of an alternating current-direct current system, characterized in that the device comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the direct current line addressing method of the alternating current-direct current system according to any one of claims 1-4 according to instructions in the program code.
10. A computer readable storage medium for storing program code for performing the direct current line location method of the alternating current-direct current system of any one of claims 1-4.
CN202310705965.XA 2023-06-14 2023-06-14 Direct current line address selection method and related device of alternating current-direct current system Pending CN116681471A (en)

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