CN112803428A - Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal - Google Patents

Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal Download PDF

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Publication number
CN112803428A
CN112803428A CN202011631794.3A CN202011631794A CN112803428A CN 112803428 A CN112803428 A CN 112803428A CN 202011631794 A CN202011631794 A CN 202011631794A CN 112803428 A CN112803428 A CN 112803428A
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bus
transient
node
static
accident
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袁博
吴鹏
邢琳
张帅
胡源
杨宏伟
邵华
李燕
张章
段利锋
张红梅
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Hebei Huizhi Electric Power Engineering Design Co ltd
State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
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Hebei Huizhi Electric Power Engineering Design Co ltd
State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hebei Electric Power 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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
    • 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
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention is suitable for the technical field of electric power, and provides a receiving end main network frame dynamic reactive power supply configuration node selection method and a terminal, wherein the method comprises the following steps: acquiring a preset accident set; performing static analysis and transient analysis on a preset accident set to respectively obtain a static vulnerability index and a transient vulnerability index of each bus node in a receiving end main network frame; determining a bus weak node according to the static vulnerability index and the transient vulnerability index of each bus node to obtain a bus weak node set; and calculating track sensitivity indexes of all bus weak nodes in the bus weak node set, and selecting the bus weak node with the maximum track sensitivity index as a configuration node of the dynamic reactive power supply. The method can reduce the complexity of the calculation method of the dynamic reactive power configuration node and improve the calculation efficiency.

Description

Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a receiving end main network frame dynamic reactive power supply configuration node selection method and a terminal.
Background
The dynamic reactive power optimization configuration technology of the receiving end main network frame is to reasonably configure a dynamic reactive power supply in the receiving end main network frame to ensure the voltage stability of a power grid in operation.
However, the inventor of the present application finds that the existing dynamic reactive power optimization configuration method is high in complexity, so that the time for calculating the dynamic reactive power configuration nodes in practical application is long, the efficiency is low, and the method is difficult to apply in a large-scale receiving end main framework.
Disclosure of Invention
In view of this, embodiments of the present invention provide a receiving-end main framework dynamic reactive power configuration node selection method and a terminal, so as to solve the problems of high complexity and low efficiency of a dynamic reactive power configuration node calculation method in the prior art.
The first aspect of the embodiment of the invention provides a receiving end main framework dynamic reactive power supply configuration node selection method, which comprises the following steps:
acquiring a preset accident set; the preset accident set is a set of accidents affecting the bus voltage stability of the main network frame at the receiving end;
performing static analysis and transient analysis on a preset accident set to respectively obtain a static vulnerability index and a transient vulnerability index of each bus node in a receiving end main network frame;
determining a bus weak node according to the static vulnerability index and the transient vulnerability index of each bus node to obtain a bus weak node set;
and calculating track sensitivity indexes of all bus weak nodes in the bus weak node set, and selecting the bus weak node with the maximum track sensitivity index as a configuration node of the dynamic reactive power supply.
Optionally, static analysis and transient analysis are performed on the preset accident set, and static vulnerability indexes and transient vulnerability indexes of each bus node in the receiving end main grid frame are obtained respectively, including:
performing static analysis and transient analysis on each accident in a preset accident set to respectively obtain a static severity index and a transient severity index of each accident;
extracting a static accident set from a preset accident set according to the static severity index of each accident, and determining the static vulnerability index of each bus node in the main network frame of the receiving end based on the static accident set;
and extracting a transient accident set from a preset accident set according to the transient severity indexes of all accidents, and determining the transient vulnerability indexes of all bus nodes in the receiving end main network frame based on the transient accident set.
Optionally, performing static analysis on each accident in a preset accident set to obtain a static severity index of each accident, including:
calculating static severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure BDA0002875012950000021
Calculating the average value of the static severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the static severity indexes of all accidents
Figure BDA0002875012950000022
In the above formula, the first and second carbon atoms are,
Figure BDA0002875012950000023
for a static severity indicator for bus node b under k incidents,
Figure BDA0002875012950000024
for the steady state voltage at bus node b before k accidents occur,
Figure BDA0002875012950000025
for the steady state voltage of the bus node b after k accidents, NbFor the number of bus nodes in the receiving end main network frame, SCSIkIs a static severity indicator for k incidents.
Optionally, extracting a static accident set from a preset accident set according to the static severity index of each accident includes:
extracting accidents of which the static severity indexes are larger than a first preset threshold value from a preset accident set to obtain a static accident set;
correspondingly, the static vulnerability index of each bus node in the receiving end main network frame is determined based on the static accident set, and the method comprises the following steps:
Figure BDA0002875012950000031
in the formula, SBVIbIs a static vulnerability indicator of the bus node b, NksNumber of incidents in static set of incidents, FsIs a static set of accidents.
Optionally, performing transient analysis on each accident in a preset accident set to obtain a transient severity index of each accident, including:
calculating transient severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure BDA0002875012950000032
Calculating the mean value of the transient severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the transient severity indexes of all the accidents
Figure BDA0002875012950000033
In the formula (I), the compound is shown in the specification,
Figure BDA0002875012950000034
for the transient severity indicator of bus node b under k accidents,
Figure BDA0002875012950000035
the voltage drop index of the bus node b under k accidents,
Figure BDA0002875012950000036
is a low voltage continuous index of the bus node b under k accidents,
Figure BDA0002875012950000037
for the voltage recovery index of bus node b under k accident, DCSIkAs a transient severity indicator of k accidents, NbAnd the number of bus nodes in the main rack is the receiving end.
Optionally, extracting a transient accident set from a preset accident set according to the transient severity index of each accident, including:
extracting accidents of which the transient severity indexes are larger than a second preset threshold value from a preset accident set to obtain a transient accident set;
correspondingly, the transient vulnerability index of each bus node in the receiving end main network frame is determined based on the transient accident set, and the transient vulnerability index comprises the following steps:
Figure BDA0002875012950000038
in the formula, DBVIbIs a transient vulnerability indicator of the bus node b, NkdNumber of incidents in the set of transient incidents, FdIs a transient accident set.
Optionally, determining a bus weak node according to the static vulnerability index and the transient vulnerability index of each bus node includes:
and if the static vulnerability index of a certain bus node in the receiving end main network frame is larger than a third preset threshold value and the transient vulnerability index is larger than a fourth preset threshold value, determining the bus node as the bus weak node.
Optionally, calculating a track sensitivity index of each bus weak node in the bus weak node set includes:
acquiring a transient simulation result of each bus weak node; the transient simulation result is a simulation result when each bus weak node is subjected to transient disturbance after each bus weak node is configured with a dynamic reactive power supply;
determining the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set according to the transient vulnerability index and the transient simulation result;
and determining the track sensitivity index of each bus weak node based on the transient severity index and the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set.
Optionally, the transient simulation result includes the dynamic reactive power injected by each bus weak node, the voltage value of each bus node in the main grid frame of the receiving end before the dynamic reactive power is injected by each bus weak node, and the voltage value of each bus node in the main grid frame of the receiving end after the dynamic reactive power is injected by each bus weak node;
determining the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set according to the transient vulnerability index and the transient simulation result, wherein the track sensitivity comprises the following steps:
Figure BDA0002875012950000041
determining a trajectory sensitivity index of each bus weak node based on the transient severity index and the trajectory sensitivity of each bus weak node under each accident in the static accident set and the transient accident set, including:
Figure BDA0002875012950000042
in the formula ITSkcFor the trace sensitivity of the weak node c of the bus under k accidents, NbFor the number of bus nodes, DBVI, in the receiving end main network framebIs a transient vulnerability indicator of the bus node b, NlNumber of cycles after accident removal, WlIs tlTime interval weight of time, Ub(tl,Qc) Injecting the voltage value of the bus node b before dynamic reactive power is injected into the bus weak node c, Ub(tl,Qc+ΔQc) Voltage value delta Q of bus node b after dynamic reactive power is injected into bus weak node ccDynamic reactive power, I, injected for bus weak node cTScIs a track sensitivity index of a weak node c of a bus, DCSIkAs a transient severity indicator of k accidents, FsFor a static set of accidents, FdFor a set of transient accidents, NksdIs the number of incidents within the set F.
A second aspect of the embodiments of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the above receiving-end main framework dynamic reactive power source configuration node selection method when executing the computer program.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the method, static analysis and transient analysis are carried out on the accidents affecting the bus voltage stability of the receiving-end main network frame, the static vulnerability indexes and the transient vulnerability indexes of all bus nodes in the receiving-end main network frame are obtained, the bus weak nodes are screened out, and then the configuration nodes of the dynamic reactive power supply can be determined only by analyzing the track sensitivity indexes of the bus weak nodes. The method can reduce the complexity of the calculation method of the dynamic reactive power configuration node and improve the calculation efficiency.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart illustrating an implementation of a receiving-end main framework dynamic reactive power supply configuration node selection method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of voltage changes at bus nodes before and after an accident according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
A first aspect of an embodiment of the present invention provides a receiving-end main framework dynamic reactive power supply configuration node selection method, as shown in fig. 1, the method specifically includes the following steps:
s101, acquiring a preset accident set; the preset accident set is a set of accidents affecting the bus voltage stability of the main grid rack at the receiving end.
In the embodiment of the invention, after an accident usually occurs, the bus voltage in the main network frame at the receiving end is influenced by different degrees, and a technician can further identify the accident causing the bus voltage stability problem according to the stability of the bus voltage after the accident occurs, and sum all the accidents possibly causing the bus voltage stability problem to form a preset accident set.
And S102, performing static analysis and transient analysis on the preset accident set to respectively obtain a static vulnerability index and a transient vulnerability index of each bus node in the receiving end main network frame.
Optionally, as a specific implementation manner of the method for selecting a dynamic reactive power supply configuration node of a receiving-end main grid rack provided in the first aspect of the embodiment of the present invention, the method includes performing static analysis and transient analysis on a preset accident set to obtain a static vulnerability index and a transient vulnerability index of each bus node in the receiving-end main grid rack, respectively, and includes:
performing static analysis and transient analysis on each accident in a preset accident set to respectively obtain a static severity index and a transient severity index of each accident;
extracting a static accident set from a preset accident set according to the static severity index of each accident, and determining the static vulnerability index of each bus node in the main network frame of the receiving end based on the static accident set;
and extracting a transient accident set from a preset accident set according to the transient severity indexes of all accidents, and determining the transient vulnerability indexes of all bus nodes in the receiving end main network frame based on the transient accident set.
In the embodiment of the invention, according to the static voltage stability regulation of the safety and stability guide rule of the power system, the bus voltage deviation is maintained to be 0.95-1.05 times of the bus steady-state voltage, so that the static severity index reflects the static severity of an accident on one hand, the transient severity index reflects the transient severity of the accident, and subsequent calculated amount can be greatly reduced by screening out the accidents with higher static severity index and transient severity index.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, the static analysis is performed on each accident in a preset accident set to obtain a static severity index of each accident, where the method includes:
calculating static severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure BDA0002875012950000071
Calculating the average value of the static severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the static severity indexes of all accidents
Figure BDA0002875012950000072
In the above formula, the first and second carbon atoms are,
Figure BDA0002875012950000073
for a static severity indicator for bus node b under k incidents,
Figure BDA0002875012950000074
for the steady state voltage at bus node b before k accidents occur,
Figure BDA0002875012950000075
for the steady state voltage of the bus node b after k accidents, NbFor the number of bus nodes in the receiving end main network frame, SCSIkIs a static severity indicator for k incidents.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, extracting a static accident set from a preset accident set according to a static severity index of each accident includes:
extracting accidents of which the static severity indexes are larger than a first preset threshold value from a preset accident set to obtain a static accident set;
correspondingly, the static vulnerability index of each bus node in the receiving end main network frame is determined based on the static accident set, and the method comprises the following steps:
Figure BDA0002875012950000076
in the formula, SBVIbIs a static vulnerability indicator of the bus node b, NksNumber of incidents in static set of incidents, FsIs a static set of accidents.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, performing transient analysis on each accident in a preset accident set to obtain a transient severity index of each accident, where the method includes:
calculating transient severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure BDA0002875012950000081
Calculating the mean value of the transient severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the transient severity indexes of all the accidents
Figure BDA0002875012950000082
In the formula (I), the compound is shown in the specification,
Figure BDA0002875012950000083
for the transient severity indicator of bus node b under k accidents,
Figure BDA0002875012950000084
the voltage drop index of the bus node b under k accidents,
Figure BDA0002875012950000085
is a low voltage continuous index of the bus node b under k accidents,
Figure BDA0002875012950000086
for the voltage recovery index of bus node b under k accident, DCSIkAs a transient severity indicator of k accidents, NbAnd the number of bus nodes in the main rack is the receiving end.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, extracting a transient accident set from a preset accident set according to a transient severity index of each accident includes:
extracting accidents of which the transient severity indexes are larger than a second preset threshold value from a preset accident set to obtain a transient accident set;
correspondingly, the transient vulnerability index of each bus node in the receiving end main network frame is determined based on the transient accident set, and the transient vulnerability index comprises the following steps:
Figure BDA0002875012950000087
in the formula, DBVIbIs a transient vulnerability indicator of the bus node b, NkdNumber of incidents in the set of transient incidents, FdIs a transient accident set.
In the embodiment of the invention, the static vulnerability index and the transient vulnerability index of the bus node respectively reflect the static influence and the transient influence caused by the accident on the bus node, the larger the static vulnerability index and the transient vulnerability index are, the larger the influence of the accident on the bus node is, the bus node with the larger static vulnerability index and the larger transient vulnerability index is calculated and screened out to be used as the alternative node, the calculated amount can be reduced, and the reasonability of the selection of the dynamic reactive power supply configuration node is ensured.
Specifically, as shown in fig. 2, a stable curve of each bus node voltage before and after the occurrence of the accident can be obtained by simulating the accident, and data required for calculating each index value can be obtained. For example, the steady-state voltage at the bus node b before k accidents
Figure BDA0002875012950000091
Steady state voltage of bus node b after accident
Figure BDA0002875012950000092
Voltage drop index of bus node b under k accident
Figure BDA0002875012950000093
Low voltage continuous index of bus node b under k accident
Figure BDA0002875012950000094
Voltage recovery index of bus node b under k accident
Figure BDA0002875012950000095
And the like.
Step S103, bus weak nodes are determined according to the static vulnerability indexes and the transient vulnerability indexes of the bus nodes, and a bus weak node set is obtained.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, determining a bus weak node according to a static vulnerability index and a transient vulnerability index of each bus node includes:
and if the static vulnerability index of a certain bus node in the receiving end main network frame is larger than a third preset threshold value and the transient vulnerability index is larger than a fourth preset threshold value, determining the bus node as the bus weak node.
And S104, calculating track sensitivity indexes of all bus weak nodes in the bus weak node set, and selecting the bus weak node with the largest track sensitivity index as a configuration node of the dynamic reactive power supply.
In the embodiment of the invention, the track sensitivity index of the bus weak node reflects the effect of configuring the dynamic reactive power supply at the bus weak node, namely the larger the track sensitivity index of the bus weak node is, the better the reactive power optimization effect is. Therefore, after the dynamic reactive power supply is configured for each bus weak node, the node with the largest track sensitivity index can be screened out as the configuration node of the dynamic reactive power supply by calculating the track sensitivity index of each bus weak node.
Optionally, as a specific implementation manner of the method for selecting a receiving-end main grid dynamic reactive power supply configuration node provided in the first aspect of the embodiment of the present invention, calculating a trajectory sensitivity index of each bus weak node in a bus weak node set includes:
acquiring a transient simulation result of each bus weak node; the transient simulation result is a simulation result when each bus weak node is subjected to transient disturbance after each bus weak node is configured with a dynamic reactive power supply;
determining the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set according to the transient vulnerability index and the transient simulation result;
and determining the track sensitivity index of each bus weak node based on the transient severity index and the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set.
Optionally, as a specific implementation manner of the method for selecting a dynamic reactive power supply configuration node of a receiving-end main grid framework provided in the first aspect of the embodiment of the present invention, the transient simulation result includes dynamic reactive power injected by each bus weak node, a voltage value of each bus node in the receiving-end main grid framework before the dynamic reactive power is injected by each bus weak node, and a voltage value of each bus node in the receiving-end main grid framework after the dynamic reactive power is injected by each bus weak node.
Determining the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set according to the transient vulnerability index and the transient simulation result, wherein the track sensitivity comprises the following steps:
Figure BDA0002875012950000101
determining a trajectory sensitivity index of each bus weak node based on the transient severity index and the trajectory sensitivity of each bus weak node under each accident in the static accident set and the transient accident set, including:
Figure BDA0002875012950000102
in the formula ITSkcFor the trace sensitivity of the weak node c of the bus under k accidents, NbFor the number of bus nodes, DBVI, in the receiving end main network framebIs a transient vulnerability indicator of the bus node b, NlNumber of cycles after accident removal, WlIs tlTime interval weight of time, Ub(tl,Qc) Injecting the voltage value of the bus node b before dynamic reactive power is injected into the bus weak node c, Ub(tl,Qc+ΔQc) Voltage value delta Q of bus node b after dynamic reactive power is injected into bus weak node ccDynamic reactive power, I, injected for bus weak node cTScIs a track sensitivity index of a weak node c of a bus, DCSIkAs a transient severity indicator of k accidents, FsFor a static set of accidents, FdFor a set of transient accidents, NksdIs the number of incidents within the set F.
Because the transient voltage stability of each bus weak node is divided into strong and weak points after an accident occurs, and the contribution of the dynamic reactive power supply to the bus weak nodes with strong transient voltage stability is small, in the embodiment of the invention, the bus weak nodes with the best transient voltage optimization effect can be selected as configuration nodes by taking the transient vulnerability indexes of the bus nodes as the node weight and taking the transient severity indexes of the accident as the fault time interval weight, so that the configuration benefit of the dynamic reactive power supply is improved.
In addition, it should be noted that, in practical applications, it is difficult to achieve the desired effect by configuring the dynamic reactive power supply at only one node, and multiple nodes are often required to be configured with the dynamic reactive power supply at the same time. For the configuration of a plurality of dynamic reactive power supplies, the configuration nodes of the dynamic reactive power supplies can be selected from the weak nodes of the remaining buses by the receiving-end main network frame dynamic reactive power supply configuration node selection method provided by the invention according to actual requirements, and the details are not repeated herein.
According to the method, static analysis and transient analysis are carried out on the accidents affecting the bus voltage stability of the receiving-end main network rack, the static vulnerability indexes and the transient vulnerability indexes of all bus nodes in the receiving-end main network rack are obtained, the bus weak nodes are screened out, and then the configuration nodes of the dynamic reactive power supply can be determined only by analyzing the track sensitivity indexes of the bus weak nodes. The method can reduce the complexity of the calculation method of the dynamic reactive power configuration node and improve the calculation efficiency.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
A second aspect of the embodiment of the present invention provides a terminal, as shown in fig. 3, where the terminal 3 of the embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. The processor 30 executes the computer program 32 to implement the steps in the above-mentioned method for selecting a slave main rack dynamic reactive power configuration node, such as steps S101 to S104 shown in fig. 1.
Illustratively, the computer program 32 may be divided into one or more modules/units, which are stored in the memory 31 and executed by the processor 30 to carry out the invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the terminal 3.
The terminal 3 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal 3 may include, but is not limited to, a processor 30, a memory 31. It will be appreciated by those skilled in the art that fig. 3 is only an example of a terminal 3 and does not constitute a limitation of the terminal 3 and may comprise more or less components than those shown, or some components may be combined, or different components, e.g. the terminal 3 may further comprise input output devices, network access devices, buses, etc.
The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the terminal 3, such as a hard disk or a memory of the terminal 3. The memory 31 may also be an external storage device of the terminal 3, such as a plug-in hard disk provided on the terminal 3, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 31 may also include both an internal storage unit of the terminal 3 and an external storage device. The memory 31 is used for storing computer programs and other programs and data required by the terminal. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed terminal and method can be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also 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 the embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A receiving end main network frame dynamic reactive power supply configuration node selection method is characterized by comprising the following steps:
acquiring a preset accident set; the preset accident set is a set of accidents affecting the bus voltage stability of the main grid rack at the receiving end;
performing static analysis and transient analysis on the preset accident set to respectively obtain a static vulnerability index and a transient vulnerability index of each bus node in the receiving end main network frame;
determining a bus weak node according to the static vulnerability index and the transient vulnerability index of each bus node to obtain a bus weak node set;
and calculating track sensitivity indexes of all bus weak nodes in the bus weak node set, and selecting the bus weak node with the maximum track sensitivity index as a configuration node of the dynamic reactive power supply.
2. The method for selecting a receiving-end main grid dynamic reactive power supply configuration node according to claim 1, wherein the performing static analysis and transient analysis on the preset accident set to obtain a static vulnerability index and a transient vulnerability index of each bus node in a receiving-end main grid respectively comprises:
performing static analysis and transient analysis on each accident in the preset accident set to respectively obtain a static severity index and a transient severity index of each accident;
extracting a static accident set from the preset accident set according to the static severity index of each accident, and determining the static vulnerability index of each bus node in the receiving end main network frame based on the static accident set;
and extracting a transient accident set from the preset accident set according to the transient severity indexes of all accidents, and determining the transient vulnerability indexes of all bus nodes in the receiving end main network frame based on the transient accident set.
3. The method for selecting receiving end main network frame dynamic reactive power supply configuration nodes according to claim 2, wherein performing static analysis on each accident in the preset accident set to obtain a static severity index of each accident comprises:
calculating static severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure FDA0002875012940000011
Calculating the average value of the static severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the static severity indexes of all accidents
Figure FDA0002875012940000021
In the above formula, the first and second carbon atoms are,
Figure FDA0002875012940000022
for a static severity indicator for bus node b under k incidents,
Figure FDA0002875012940000023
for the steady state voltage at bus node b before k accidents occur,
Figure FDA0002875012940000024
for the steady state voltage of the bus node b after k accidents, NbFor the number of bus nodes in the receiving end main network frame, SCSIkIs a static severity indicator for k incidents.
4. The method for selecting a receiving end main framework dynamic reactive power configuration node according to claim 3, wherein the extracting a static accident set from the preset accident set according to the static severity index of each accident comprises:
extracting accidents of which the static severity indexes are larger than a first preset threshold value from the preset accident set to obtain a static accident set;
correspondingly, the determining the static vulnerability index of each bus node in the receiving end main network frame based on the static accident set includes:
Figure FDA0002875012940000025
in the formula, SBVIbIs a static vulnerability indicator of the bus node b, NksNumber of incidents in static set of incidents, FsIs a static set of accidents.
5. The method for selecting receiving end main network frame dynamic reactive power supply configuration nodes according to claim 2, wherein performing transient analysis on each accident in the preset accident set to obtain a transient severity index of each accident comprises:
calculating transient severity indexes of all bus nodes in receiving end main network frame under all accidents
Figure FDA0002875012940000026
Calculating the mean value of the transient severity indexes of all bus nodes in the main network frame of the receiving end under all accidents to obtain the transient severity indexes of all the accidents
Figure FDA0002875012940000031
In the formula (I), the compound is shown in the specification,
Figure FDA0002875012940000032
for the transient severity indicator of bus node b under k accidents,
Figure FDA0002875012940000033
the voltage drop index of the bus node b under k accidents,
Figure FDA0002875012940000034
is a low voltage continuous index of the bus node b under k accidents,
Figure FDA0002875012940000035
for the voltage recovery index of bus node b under k accident, DCSIkAs a transient severity indicator of k accidents, NbAnd the number of bus nodes in the main rack is the receiving end.
6. The method for selecting a receiving main grid dynamic reactive power configuration node according to claim 5, wherein the extracting a transient accident set from the preset accident set according to the transient severity index of each accident comprises:
extracting accidents of which the transient severity indexes are larger than a second preset threshold value from the preset accident set to obtain a transient accident set;
correspondingly, the determining the transient vulnerability index of each bus node in the receiving end main network frame based on the transient accident set includes:
Figure FDA0002875012940000036
in the formula, DBVIbIs a transient vulnerability indicator of the bus node b, NkdNumber of incidents in the set of transient incidents, FdIs a transient accident set.
7. The method for selecting receiving end main network frame dynamic reactive power supply configuration nodes according to claim 1, wherein the determining bus bar weak nodes according to the static vulnerability index and the transient vulnerability index of each bus bar node comprises:
and if the static vulnerability index of a certain bus node in the receiving end main network frame is larger than a third preset threshold value and the transient vulnerability index is larger than a fourth preset threshold value, determining the bus node as the bus weak node.
8. The receiving end main grid dynamic reactive power supply configuration node selection method according to claim 2, wherein the calculating of the trajectory sensitivity index of each bus weak node in the bus weak node set includes:
acquiring a transient simulation result of each bus weak node; the transient simulation result is a simulation result when each bus weak node is subjected to transient disturbance after each bus weak node is configured with a dynamic reactive power supply;
determining the track sensitivity of each bus weak node under each accident in the static accident set and the transient accident set according to the transient vulnerability index and the transient simulation result;
determining a trajectory sensitivity indicator for each bus bar weak node based on the transient severity indicator and a trajectory sensitivity of each bus bar weak node under each incident in the static incident set and the transient incident set.
9. The receiving-end main grid dynamic reactive power supply configuration node selection method according to claim 8, wherein the transient simulation result includes dynamic reactive power injected by each bus weak node, a voltage value of each bus node in the receiving-end main grid before dynamic reactive power is injected by each bus weak node, and a voltage value of each bus node in the receiving-end main grid after dynamic reactive power is injected by each bus weak node;
determining, according to the transient vulnerability index and the transient simulation result, trajectory sensitivities of each bus weak node under each accident in the static accident set and the transient accident set, including:
Figure FDA0002875012940000041
the determining a trajectory sensitivity indicator for each busbar weak node based on the transient severity indicator and the trajectory sensitivity of each busbar weak node under each incident in the static incident set and the transient incident set includes:
Figure FDA0002875012940000042
in the formula ITSkcFor the trace sensitivity of the weak node c of the bus under k accidents, NbFor the number of bus nodes, DBVI, in the receiving end main network framebIs a transient vulnerability indicator of the bus node b, NlNumber of cycles after accident removal, WlIs tlTime interval weight of time, Ub(tl,Qc) Injecting the voltage value of the bus node b before dynamic reactive power is injected into the bus weak node c, Ub(tl,Qc+ΔQc) Voltage value delta Q of bus node b after dynamic reactive power is injected into bus weak node ccDynamic reactive power, I, injected for bus weak node cTScIs a track sensitivity index of a weak node c of a bus, DCSIkAs a transient severity indicator of k accidents, FsFor a static set of accidents, FdFor a set of transient accidents, NksdIs the number of incidents within the set F.
10. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 9 when executing the computer program.
CN202011631794.3A 2020-12-31 2020-12-31 Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal Pending CN112803428A (en)

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