CN115292917A - Power grid fault consequence control measure analysis method considering fault transfer ratio - Google Patents

Power grid fault consequence control measure analysis method considering fault transfer ratio Download PDF

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CN115292917A
CN115292917A CN202210881696.8A CN202210881696A CN115292917A CN 115292917 A CN115292917 A CN 115292917A CN 202210881696 A CN202210881696 A CN 202210881696A CN 115292917 A CN115292917 A CN 115292917A
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fault
equipment
transfer ratio
power grid
faults
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邓秋荃
梁振成
孙艳
罗翠云
靳岳超
吴茵
梁阳豆
李光明
凌谢津
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Guangxi Power Grid Co Ltd
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Guangxi Power Grid Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid distribution networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
    • 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]

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Abstract

The invention provides a power grid fault consequence control measure analysis method considering a fault transfer ratio, and belongs to the field of power grid operation mode arrangement. The method takes a power grid network frame in an operation mode as a model, and utilizes the power grid model to measure and identify the connection relation of node branches; setting a full-network N-1, N-2 fault, and screening out key faults; calculating the transfer ratio of the fault equipment to the influencing equipment through the heavy point fault; and finally, setting the fault equipment, the transfer ratio and the influence equipment as monitoring channels, calculating the active sensitivity of the monitoring channels in a mode of simulating and adjusting the output of the unit, and giving control measures according to the active sensitivity. The invention can solve the problems that the grid equipment is huge, and the arrangement of fault preprocessing measures is not strict enough due to possible calculation omission by only manual analysis.

Description

Power grid fault consequence control measure analysis method considering fault transfer ratio
Technical Field
The invention relates to the field of arrangement of power grid operation modes, in particular to a power grid fault consequence control measure analysis method considering a fault transfer ratio.
Background
With the rapid development of national economy, the electricity consumption of society is frequently and highly innovative, the scale of a power grid is rapidly increased, and the density of the power grid is gradually increased in economically developed areas. Meanwhile, with the improvement of the social governing level, the requirements of the society on power supply reliability and power supply quality are also greatly improved, in order to meet the social requirements, a power grid gradually forms a power supply network frame of a multi-voltage-level multi-loop network, and after equipment failure is caused, the trend transfer relationship is complex and changeable, so that the difficulty of power grid control is increased, and the safety of the power grid is threatened. Therefore, an analysis method capable of considering multiple factors is urgently needed to evaluate the power grid control measures.
Disclosure of Invention
The invention aims to provide a power grid fault consequence control measure analysis method considering a fault transfer ratio, which can solve the problem that in the prior art, due to the fact that a power grid equipment network frame is huge, calculation omission may occur by means of manual analysis alone, and therefore fault preprocessing measures are not strictly arranged.
The purpose of the invention is realized by the following technical scheme, which comprises the following steps:
s1, acquiring an operation mode from an offline BPA system, taking a power grid network frame in the operation mode as a model, and taking an operation state in the operation mode as measurement;
s2, carrying out topology analysis on the basis of the obtained power grid model measurement, and identifying the connection relation of node branches;
s3, setting the faults of the whole network N-1 and N-2 based on the safety and stability rule guide requirements of the power system, and screening key faults according to the load rate of the equipment affected after the faults;
s4, calculating the transfer ratio of the fault equipment to the influencing equipment according to the key faults in the S3;
s5, setting fault equipment, transfer ratio and influence equipment as monitoring channels;
s6, calculating the active sensitivity of the monitoring channel in a mode of simulating and adjusting the output of the unit;
and S7, giving control measures according to the active sensitivity of the monitoring channel.
More specifically, the offline BPA system in S1 exposes the data file in a special format, and parses the data file in a specified format; and the measurement is obtained by converting the power flow on each branch circuit and the voltage on the bus, which are analyzed by the power flow calculation result.
A special form of the offline BPA system data file, typically in the dat format; analyzing and expressing the power grid equipment in a fixed format, such as parameters of resistance, reactance and the like; the specific topological wiring mode of a main transformer power grid and the like.
More specifically, the method for screening the major faults in S3 includes: setting an expected fault mainly comprising equipment N-1, a tower N-2 and the like, and taking a fault with the load rate of the equipment exceeding 80 percent when the fault occurs as a key fault.
More specifically, the transition ratio in S4 is calculated as follows:
Figure BDA0003764403690000021
wherein gamma is the transfer ratio, P i ' to influence the device flow after a fault, P i To influence the initial power flow of the plant, P damage Is a failed equipment flow.
More specifically, the load flow calculation formula of the monitoring channel is as follows:
P ctrl ＝γ*P damage +P i
P ctrl for channel flow monitoring, gamma is the transfer ratio, P damage For the flow of faulty equipment, P i To influence the initial power flow of the device.
More specifically, the calculating the active sensitivity of the monitoring channel by simulating the mode of adjusting the output of the unit means that the output of the unit is adjusted one by one, and the influence of the output change of the unit on the tidal current result of the monitoring channel is observed, and the method comprises the following steps: the output of the unit is reduced, the tide of the monitoring channel is also reduced, and the unit is defined as a channel positive correlation unit; the output of the unit is reduced, the flow of the monitoring channel is increased, and the unit is defined as a negative correlation unit of the channel.
More specifically, the control measures aim to monitor that the current carrying capacity of the fault influencing device is not exceeded by the current flow.
Compared with the prior art, the beneficial effects are:
the invention can calculate the active sensitivity of the monitoring channel by simulating the mode of adjusting the output of the unit, and then gives control measures according to the active sensitivity, thereby solving the problems that the grid structure of the power grid equipment is huge, and the arrangement of fault preprocessing measures is not strict enough because calculation is possibly missed by only depending on manual analysis.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1: a flow chart of a method for analyzing power grid fault consequence control measures considering a fault transfer ratio is provided.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
The implementation of the scheme mainly comprises the following steps (shown in a flow chart in figure 1):
step S1: acquiring an operation mode from the offline BPA system, taking a power grid network frame in the operation mode as a model, and taking an operation state in the operation mode as measurement;
in the step S1, the offline BPA system exposes the data file in a special format, and performs analysis in a specified format, that is, the acquisition of the model in the BPA data and the data of the load and the unit output can be completed, then performs the load flow calculation, and analyzes the load flow on each branch and the voltage on the bus from the load flow calculation result file, and converts the load flow and the voltage into measurement reading. The load flow calculation method comprises a Newton Raphson method and an optimal multiplier method.
Step S2: carrying out topology analysis on the basis of the obtained power grid model measurement, and identifying the connection relation of node branches;
in the step S2, performing topology analysis and identifying the connection relationship of the node branches based on the obtained power grid model measurement means performing topology analysis after the power grid model and the measurement are obtained in the step S1, and converting the power grid model into a node-branch simplified model to obtain the connection relationship of the node branches.
The topology analysis is as follows: for closed on-off equipment, if one side of the on-off equipment is a bus or a unit node and the other side of the on-off equipment is also the bus or the unit node, combining the two nodes and discarding the on-off equipment; if one side of the cut-off equipment is a bus or a unit node, and the other side of the cut-off equipment is branch equipment such as a circuit and a main transformer winding, the branch is directly connected to the node, and the cut-off equipment is discarded; if the branch equipment such as a line and a main transformer on one side of the cut-off equipment and the branch equipment on the other side are also the branch equipment, adding a virtual node, connecting the two branch equipment on the virtual node, and discarding the cut-off equipment; the disconnected device is directly discarded. After the processing of the link, all the cut-off equipment is discarded, and the power grid model is converted into a node-branch simplified model.
And step S3: setting a whole network N-1, N-2 fault based on the safety and stability guide rule requirement of the power system, and screening key faults according to the load rate of the equipment affected after the fault;
in the step S3, the setting of the faults N-1 and N-2 of the whole grid based on the safety and stability guideline requirement of the power system, and the screening of the major faults according to the load rate of the equipment affected after the faults means that the expected faults are set according to the safety and stability guideline requirement of the power system, and the faults mainly include the equipment N-1, the same tower N-2, and the like; after setting faults, calculating the load rates of other equipment branches under the condition of one fault as fault influence equipment, and calculating the load rates of the faults with the load rates exceeding 80% as key faults according to the fault load flows of the fault influence equipment;
and step S4: setting key faults and calculating the transfer ratio of the fault equipment to the affected equipment;
in the step S4, the setting of the major fault and the calculation of the transfer ratio of the faulty device to the influencing device means that the transfer ratio of the major faulty device to the influencing device is calculated for the major fault obtained in the step S3, so that in the current mode, a linear transfer relationship of the faulty device to the faulty influencing device can be obtained; fault equipment current is P damage With an initial power flow of P i The post-fault influencing equipment flow is P i ', the transfer ratio is gamma, and the calculation formula is as follows:
Figure BDA0003764403690000051
step S5: setting fault equipment, transfer ratio and influence equipment as monitoring channels;
in the step S5, the setting of the faulty device, the transfer ratio and the influencing device as the monitoring channel means that the faulty device, the influencing device and the transfer ratio obtained in the step S4 are combined into the monitoring channel, and the flow of the monitoring channel is P ctrl The transfer ratio is gamma, and the fault equipment power flow is P damage With an initial power flow of P i The formula for calculating the load flow of the monitoring channel is as follows:
P ctrl ＝γ*P damage +P i
step S6: calculating the active sensitivity of the monitoring channel by simulating and adjusting the output of the unit;
in the step S6, the calculating of the active sensitivity of the monitoring channel by simulating and adjusting the output of the unit means traversing the whole network unit, adjusting the output of the unit one by one, observing the influence of the output change of the unit on the tidal current result of the monitoring channel, reducing the output of the unit and the tidal current of the monitoring channel, and defining the unit as a positive channel correlation unit; and the output of the unit is reduced, the flow of the monitoring channel is increased, and the unit is defined as a channel negative correlation unit.
Step S7: and giving control measures according to the active sensitivity of the monitoring channel.
In the step S7, the step of providing the control measure according to the active sensitivity of the monitoring channel means that the output control measure of the relevant unit is provided with a goal that the tidal current of the monitoring channel does not exceed the current carrying capacity of the fault influence equipment according to all the monitoring channels calculated in the step S5 and the positive and negative relevant units of all the monitoring channels obtained in the step S6.
In this embodiment, the output control measures of the relevant units obtained by each monitoring channel are substituted into the initial mode to perform load flow calculation verification, and if the verification is passed, the control measures are valid. The method for analyzing the fault consequence control measure considering the fault transfer ratio is a specific embodiment of the present invention, which already embodies the essential features and advances of the present invention, and can make equivalent modifications in terms of shape, structure, etc. according to the practical use requirements, and is within the protection scope of the present solution.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.

Claims (7)

1. A fault consequence control measure analysis method considering a fault transfer ratio is characterized by comprising the following steps of:
s1, acquiring an operation mode from an offline BPA system, taking a power grid network frame in the operation mode as a model, and taking an operation state in the operation mode as measurement;
s2, carrying out topology analysis on the basis of the obtained power grid model measurement, and identifying the connection relation of the node branches;
s3, setting the faults of the whole network N-1 and N-2 based on the safety and stability rule guide requirements of the power system, and screening key faults according to the load rate of the equipment affected after the faults;
s4, calculating the transfer ratio of the fault equipment to the influencing equipment according to the key faults in the S3;
s5, setting fault equipment, transfer ratio and influence equipment as monitoring channels;
s6, calculating the active sensitivity of the monitoring channel in a mode of simulating and adjusting the output of the unit;
and S7, giving control measures according to the active sensitivity of the monitoring channel.
2. The method of claim 1, wherein the data files of the offline BPA system are exposed and parsed; and the measurement is obtained by converting the power flow on each branch circuit and the voltage on the bus, which are analyzed by the power flow calculation result.
3. The method according to claim 1, wherein the method for screening the key faults is as follows: the expected faults are set, mainly comprise equipment N-1, a same tower N-2 and the like, and the faults with the fault influence equipment load rate exceeding 80% are taken as key faults.
4. The method of claim 1, wherein the transfer ratio is calculated as follows:
Figure FDA0003764403680000011
wherein gamma is the transfer ratio, P i ' to influence the device flow after a fault, P i To influence the initial power flow of the plant, P damage Is a flow of faulty equipment.
5. The method of claim 1, wherein the power flow calculation formula of the monitoring channel is as follows:
P ctrl ＝γ*P damage +P i
P ctrl for monitoring the current of the channel, gamma is the transfer ratio, P damage For fault equipment flows, P i In order to influence the initial power flow of the equipment.
6. The method of claim 1, wherein the calculating the active sensitivity of the monitoring channel by simulating and adjusting the output of the units means adjusting the output of the units one by one and observing the influence of the output change of the units on the flow result of the monitoring channel.
7. A method according to claim 1, characterized in that said control measures aim at monitoring that the current carrying capacity of the fault influencing device is not exceeded by the current flow.
CN202210881696.8A 2022-07-26 2022-07-26 Power grid fault consequence control measure analysis method considering fault transfer ratio Pending CN115292917A (en)

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