CN112072715A - Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint - Google Patents

Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint Download PDF

Info

Publication number
CN112072715A
CN112072715A CN202010979994.1A CN202010979994A CN112072715A CN 112072715 A CN112072715 A CN 112072715A CN 202010979994 A CN202010979994 A CN 202010979994A CN 112072715 A CN112072715 A CN 112072715A
Authority
CN
China
Prior art keywords
power grid
new energy
replacement
constraint
operation mode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010979994.1A
Other languages
Chinese (zh)
Other versions
CN112072715B (en
Inventor
赵学茂
朱玲
刘福锁
李威
李兆伟
吴雪莲
黄锡芳
段方维
杨滢璇
金一丁
邱威
王超
王玉
常海军
黄畅想
丁钊
陈珏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Original Assignee
State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, State Grid Liaoning Electric Power Co Ltd, Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd, Nari Technology Co Ltd, State Grid Electric Power Research Institute filed Critical State Grid Corp of China SGCC
Priority to CN202010979994.1A priority Critical patent/CN112072715B/en
Publication of CN112072715A publication Critical patent/CN112072715A/en
Application granted granted Critical
Publication of CN112072715B publication Critical patent/CN112072715B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • 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]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin

Abstract

The invention discloses a method and a device for determining the new energy acceptance of a power grid in consideration of transient voltage constraint, wherein the method comprises the following steps: acquiring power grid topological data and operation state data, and determining a constraint fault in a current operation mode; calculating the sensitivity of the output of each conventional unit to the voltage of a preset power grid key node under a constraint fault; and for the replaceable conventional units, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy units according to the sensitivity sequence, responding to transient voltage instability of a system after any replacement, and determining the maximum or minimum acceptance capacity of new energy in the current operation mode according to the operation mode of the power grid after the last replacement. By utilizing the method, the transient voltage influence caused by the replacement of the new energy and the conventional unit can be estimated and calculated in advance, guidance is provided for the unit replacement of an actual power grid, the operation safety of the power grid is guaranteed, and the consumption capacity of the new energy of the power grid is improved.

Description

Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint
Technical Field
The invention relates to the technical field of safe operation scheduling of a power grid, in particular to a method and a device for determining the new energy acceptance of the power grid by considering transient voltage constraint.
Background
The large-machine small-network system is a typical large-machine small-network system, low in load, large in new energy ratio, long in distance and capable of crossing large-area alternating-current and direct-current interconnected network operation, achieves huge economic benefits, enables mutual influence and interaction of all levels of power networks to be further enhanced, enables the safety and stability operation of the power networks to be more remarkable in integrated characteristic and interaction influence, and is prominent in transient stability problem of the system during construction transition of the interconnected power networks, and coupling characteristics between a direct-current system and a weak alternating-current section and among a plurality of internal alternating-current sections are obvious. Meanwhile, due to the fact that the self-regulation capacity of the power grid is poor, the output of the new energy and the output of a conventional unit change along with the influence of load and climate factors, the risk of system voltage instability after transient faults exists, and chain reaction caused by the fact that the new energy is disconnected can be caused under the extreme condition. These factors all bring great challenges to the safety and stability analysis and control of the power grid. How to fully utilize the existing prevention and control means and evaluate the new energy acceptance capacity in the current mode in real time has important significance.
With the continuous innovation of national energy system, the maximum consumption of new energy is a difficult problem for the current power grid operation. In the actual operation process, in order to ensure the safe and stable operation of the power grid, the minimum conventional unit is set to start according to the maximum load prediction in the same day, and the solution ensures the safety of the power grid in a large-load mode. When the operation mode is transited to a small load and the new energy is generated greatly, the conventional startup is too much, and the output of the new energy is seriously restricted.
Noun interpretation
Voltage safety binary meter: the acceptability of the instantaneous voltage deviation can be described by constructing a voltage safety binary table [ vcr, tcr ] with a given voltage droop threshold (vcr) and a voltage anomaly duration (tcr) outside this given value. For a voltage curve of a node, if the maximum duration of the voltage falling below the binary set voltage drop threshold is less than the limit time, the voltage deviation is safe, otherwise, the voltage deviation is unsafe.
Disclosure of Invention
The invention aims to provide a method for determining the new energy accepting capacity of a power grid in consideration of transient voltage constraint, which can be used for pre-evaluating and calculating the transient voltage influence caused by the replacement of new energy and conventional units, providing guidance for the unit replacement of an actual power grid, ensuring the operation safety of the power grid and improving the new energy accepting capacity of the power grid.
The technical scheme adopted by the invention is as follows:
in one aspect, the invention provides a method for determining the new energy acceptance of a power grid in consideration of transient voltage constraints, which comprises the following steps:
acquiring power grid topological data and acquiring power grid operation state data;
determining a constraint fault constrained by transient voltage in a current operation mode according to the power grid topological data and the operation state data;
calculating the sensitivity of the output of each conventional unit to the voltage of a preset power grid key node under the constraint fault;
and sequencing replaceable conventional units according to sensitivity, sequentially performing equal-capacity simulation replacement on the replaceable conventional units to form new energy units, responding to transient voltage instability of a system after any replacement, and determining the new energy acceptance capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
Optionally, the replaceable conventional units are sorted according to sensitivity, sequentially replaced by new energy units through equal-capacity simulation, and in response to transient voltage instability of a system after any replacement, new energy acceptance under transient constraint of a current operation mode of a power grid is determined according to a power grid operation mode after the last replacement, where the new energy acceptance includes:
for a replaceable conventional unit, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional unit into a new energy unit according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and taking the capacity of the new energy unit which is completely replaced before the replacement as the maximum new energy accepting capacity under transient constraint of the current operation mode of a power grid;
and for the replaceable conventional units, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy source units according to the sequence of sensitivity from large to small, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy source units before the replacement as the minimum new energy source accepting capacity under transient constraint of the current operation mode of the power grid.
According to the scheme, the new energy receiving capacity under the transient constraint of the current operation mode comprises the maximum receiving capacity and the minimum receiving capacity, and the maximum receiving capacity and the minimum receiving capacity are respectively the capacities of all replaced new energy units before the replacement which causes the transient voltage instability of the system. The method can realize quantitative prediction and evaluation of the new energy replacement capability of the power grid, can more conveniently and clearly provide guidance for frequent replacement of new energy output and conventional unit output in the actual operation power grid, and ensures stable operation of the power grid.
Optionally, the determining of the constraint fault includes:
determining a power grid mathematical model according to the power grid topological data;
determining the current operation mode of the power grid according to the operation state data;
according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault;
and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
Optionally, in the present invention, the predetermined condition is satisfiedA plurality of anticipated faults in the fault set are provided with at least one voltage safety binary table, expressed as:
Figure BDA0002687180490000031
i is 1,2 … N, wherein N represents the number of voltage safety binary tables,
Figure BDA0002687180490000032
representing a given voltage offset threshold u in the ith voltage safety binary tablecr-iThe duration of (c). The number of the voltage safety binary tables can be set according to experience according to the number of the expected faults in the expected fault set and the correlation between the expected faults, so that the system voltage safety margin under the expected faults can be calculated more reliably.
Optionally, the method for calculating the sensitivity of each conventional unit to the voltage of the key node of the preset power grid under the constraint fault includes:
respectively calculating system voltage stability margins for adjusting the output of each conventional unit under the constraint fault;
calculating the voltage-output sensitivity delta gamma of each replaceable conventional unit to the key node of the power grid according to the voltage stability margin of the systemjThe method comprises the following steps:
Δγj＝ηvj/Δpj
wherein eta isvjFor voltage stability margin, Δ p, corresponding to the jth conventional unitjAnd adjusting the output of the jth conventional unit.
Optionally, the determining of the maximum new energy receiving capacity under the transient constraint of the current operation mode of the power grid includes:
s01, replacing the capacity of the conventional unit with the minimum sensitivity and the like with a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s02, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s03, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S04;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S01-S03;
and S04, stopping replacement, and taking the power grid operation mode after the last replacement as the maximum new energy receiving capacity of the current operation mode.
Optionally, the determining of the minimum new energy acceptance under the transient constraint of the current operation mode of the power grid includes:
s11, replacing the capacity of the conventional unit with the maximum sensitivity into a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s12, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s13, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S14;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S11-S13;
and S14, stopping replacement, and taking the power grid operation mode after the last replacement as the minimum new energy receiving capacity of the current operation mode.
The simulation replacement is related replacement realized by time domain simulation, and the calculation, judgment and other processes after the replacement.
In a second aspect, the present invention provides a device for determining new energy acceptance capability of a power grid considering transient voltage constraints, including:
the data acquisition module is configured for acquiring power grid topology data and acquiring power grid operation state data;
the constraint fault determination module is configured for determining a constraint fault constrained by the transient voltage in the current operation mode according to the power grid topology data and the operation state data;
the sensitivity calculation module is configured for calculating the sensitivity of the output of each conventional unit to the voltage of a key node of a preset power grid under the constraint fault;
and the new energy admission capacity determining module is configured for sequencing replaceable conventional units according to sensitivity, sequentially performing equal-capacity simulation replacement on the replaceable conventional units to obtain new energy units, responding to transient voltage instability of a system after any replacement, and determining new energy admission capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
Optionally, the new energy receptivity determining module sequences replaceable conventional units according to sensitivity, sequentially performs equal-capacity simulation replacement to the new energy units, responds to transient voltage instability of a system after any replacement, and determines the new energy receptivity under transient constraint of a current operation mode of a power grid according to a power grid operation mode after last replacement, including:
for a replaceable conventional unit, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional unit into a new energy unit according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and taking the capacity of the new energy unit which is completely replaced after the last replacement as the maximum new energy accepting capacity under transient constraint of the current operation mode of a power grid;
the method is used for sequentially carrying out equal-capacity simulation replacement on replaceable conventional units into new energy source units according to the sequence of sensitivity from high to low, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy source units after the last replacement as the minimum new energy receiving capacity under transient constraint of the current operation mode of a power grid.
Optionally, the determining of the constraint fault by the constraint fault determining module includes:
determining a power grid mathematical model according to the power grid topological data;
determining the current operation mode of the power grid according to the operation state data;
according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault;
and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for determining new energy acceptance of a power grid considering transient voltage constraints as set forth in the first aspect.
Advantageous effects
The method is based on a transient safety and stability quantitative analysis theory and method, and the estimation and prediction of the new energy acceptance capability of the power grid are realized by analyzing the influence of the conventional unit and the new energy replacement on the transient voltage stability margin of the system under the constraint fault of the power grid. By utilizing the method, rapid new energy acceptance capability assessment and replacement scheduling guidance can be provided for frequent replacement of new energy output and conventional unit output in an actual operation power grid, and the safe and stable operation of the power grid is guaranteed.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
fig. 2 is a schematic flow chart of an embodiment of the present invention.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
Example 1
Referring to fig. 1, the present embodiment describes a method for determining a new energy admission capacity of a power grid in consideration of transient voltage constraints, including:
acquiring power grid topological data and acquiring power grid operation state data;
determining a constraint fault constrained by transient voltage in a current operation mode according to the power grid topological data and the operation state data;
calculating the sensitivity of the output of each conventional unit to the voltage of a preset power grid key node under the constraint fault;
and sequencing replaceable conventional units according to sensitivity, sequentially performing equal-capacity simulation replacement on the replaceable conventional units to form new energy units, responding to transient voltage instability of a system after any replacement, and determining the new energy acceptance capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
Examples 1 to 1
Based on embodiment 1, this embodiment specifically introduces a flow of a method for determining a new energy admission capacity of a power grid in consideration of transient voltage constraints, and as shown in fig. 2, the method specifically relates to the following.
First, obtain the data
In specific applications, the data obtained by the present invention may include: relevant data of power grid operation mode, relevant data of power grid topology, preset expected fault set, preset voltage safety binary table and pre-screened system key bus uvAnd so on.
The data acquisition is used for time domain simulation, wherein a power grid mathematical model can be determined according to power grid topological data, and the current operation mode of a power grid of the time domain simulation can be determined according to power grid real-time operation state data. Time domain simulation may refer specifically to the prior art.
And secondly, performing time domain simulation based on the acquired data, and determining the constraint fault constrained by the transient voltage in the current operation mode.
The specific operation of this step is: according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault; and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
The voltage safety binary table describes the information of the transient process on the voltage safety requirement, and the threshold value u is deviated by the given voltagecrAnd duration of voltage anomaly deviating from the set value
Figure BDA0002687180490000061
Formed binary meter
Figure BDA0002687180490000062
The meaning of the voltage safety binary table is that if and only if the voltage deviates from ucrFor a duration exceeding
Figure BDA0002687180490000063
The transient voltage is judged to be unsafe.
In this embodiment, at least one voltage safety binary table is provided for a plurality of expected faults in the preset expected fault set, and is expressed as:
Figure BDA0002687180490000071
i is 1,2 … N, wherein N represents the number of voltage safety binary tables,
Figure BDA0002687180490000072
representing a given voltage offset threshold u in the ith voltage safety binary tablecr-iThe duration of (c). The number of the voltage safety binary tables can be set according to experience according to the number of the expected faults in the expected fault set and the correlation between the expected faults, so that the system voltage safety margin under the expected faults can be calculated more reliably.
Thirdly, calculating the sensitivity of the output of each conventional unit to the voltage of the preset power grid key node under the constraint fault
The sensitivity calculation method comprises the following steps:
taking the pre-screened system key bus as a voltage monitoring bus, and determining a power grid key voltage node;
through time domain simulation calculation, system voltage stability margin eta corresponding to the adjustment of the output of each conventional unit (namely, the capacity of each conventional unit is replaced by a certain set adjustment amount) under the constraint fault is respectively obtainedv1,ηv2,ηv3…,ηvjWherein j is the number of replaceable conventional units;
calculating the voltage-output sensitivity delta gamma of each replaceable conventional unit to the key node of the power grid according to the voltage stability margin of the systemjThe method comprises the following steps:
Δγ1＝ηv1/Δp1、Δγ2＝ηv2/Δp2,…Δγj＝ηvj/Δpj
wherein eta isvjFor voltage stability margin, Δ p, corresponding to the jth conventional unitjAnd adjusting the output of the jth conventional unit.
Fourthly, determining new energy accepting capacity of power grid under transient constraint
The determination of the new energy admission capacity under the transient constraint of the current operation mode of the power grid, including the determination of the maximum admission capacity and the minimum admission capacity of the new energy, can be determined by adopting the following scheme:
for a replaceable conventional unit, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional unit into a new energy unit according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and determining the maximum new energy acceptance capacity under transient constraint of the current operation mode of a power grid according to the operation mode of the power grid after the last replacement;
and for the replaceable conventional units, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy units according to the sequence of sensitivity from large to small, responding to transient voltage instability of a system after any replacement, and determining the minimum new energy acceptance capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
The maximum/minimum acceptance of new energy in the current operation mode may be the capacity of all replaced new energy units before replacement which causes the transient voltage instability of the system. The specific steps of the determination of the new energy admission capacity are described below.
4-1) the determination of the maximum new energy acceptance under the transient constraint of the current operation mode of the power grid under the transient constraint comprises the following steps:
s01, replacing the capacity of the conventional unit with the minimum sensitivity and the like with a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s02, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s03, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S04;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S01-S03;
and S04, stopping replacement, and taking the power grid operation mode after the last replacement as the maximum new energy receiving capacity of the current operation mode.
The above process of determining the maximum new energy admission capacity is also shown in fig. 2:
equal-capacity new energy replacement current delta gammajThe smallest conventional unit corresponds to the step S01;
through time domain simulation, the transient voltage stability margin eta of the system under the constraint fault is obtainedv is largeCorresponding to step S02;
comparing the transient voltage stability margin of the system with a preset threshold, if the preset threshold is zeta, which is the lowest acceptable and transient voltage stability margin, then: if etav is largeIf yes, recalculating the sensitivity of the output of each un-replaced conventional unit to the preset power grid key node voltage under the constraint fault, and continuing replacement, calculation, comparison and the like; corresponding to step S03
If etav is largeAnd when the grid voltage is smaller than zeta, returning to the previous round of replacement working condition of the equal-capacity new energy and the conventional unit, and taking the capacity of all replaced new energy in the power grid operation mode after the previous replacement as the maximum new energy receiving capacity under the transient voltage constraint of the current grid structure, corresponding to step S04.
4-2) the determination of the minimum admission capacity of the new energy under the transient constraint of the current operation mode of the power grid under the transient constraint comprises the following steps:
s11, replacing the capacity of the conventional unit with the maximum sensitivity into a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s12, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s13, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S14;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S11-S13;
and S14, stopping replacement, and taking the power grid operation mode after the last replacement as the minimum new energy receiving capacity of the current operation mode.
The above process of determining the minimum admission capacity of the new energy is also shown in fig. 2:
equal-capacity new energy replacement current delta gammajThe largest conventional unit corresponds to step S11;
through time domain simulation, the transient voltage stability margin eta of the system under the constraint fault is obtainedv is largeCorresponding to step S12;
comparing the transient voltage stability margin of the system with a preset threshold, if the preset threshold is zeta, which is the lowest acceptable and transient voltage stability margin, then: if etav is largeIf yes, recalculating the sensitivity of the output of each un-replaced conventional unit to the preset power grid key node voltage under the constraint fault, and continuing replacement, calculation, comparison and the like; corresponding to step S13
If etav is largeAnd when the grid voltage is smaller than zeta, returning to the previous round of replacement working condition of the equal-capacity new energy and the conventional unit, and taking the capacity of all replaced new energy in the power grid operation mode after the previous replacement as the minimum new energy receiving capacity under the transient voltage constraint of the current grid structure, corresponding to step S14.
Example 2
A grid new energy acceptance determination apparatus considering transient voltage constraints, comprising:
the data acquisition module is configured for acquiring power grid topology data and acquiring power grid operation state data in real time;
the constraint fault determination module is configured for determining a constraint fault constrained by the transient voltage in the current operation mode according to the power grid topology data and the operation state data;
the sensitivity calculation module is configured for calculating the sensitivity of the output of each conventional unit to the voltage of a key node of a preset power grid under the constraint fault;
and the new energy admission capacity determining module is configured for sequencing replaceable conventional units according to sensitivity, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy units, responding to transient voltage instability of a system after any replacement, and determining the new energy admission capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
In this embodiment, the specific function implementation of each functional module refers to the specific content of the relevant method process in embodiment 1, for example:
the new energy admission capacity determination module comprises:
the new energy maximum admission capacity determining submodule is configured for sequentially carrying out equal-capacity simulation replacement on replaceable conventional units into new energy units according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy units after the last replacement as the maximum admission capacity of new energy under transient constraint of the current operation mode of a power grid;
and the new energy minimum admission capacity determining submodule is configured for sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy units according to the sequence of sensitivity from high to low, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy units after the last replacement as the new energy minimum admission capacity under transient constraint of the current operation mode of the power grid.
The determining of the constraint fault by the constraint fault determining module comprises the following steps:
determining a power grid mathematical model according to the power grid topological data;
determining the current operation mode of the power grid according to the operation state data;
according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault;
and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
Example 3
The present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for determining new energy receptivity of a power grid in consideration of transient voltage constraints as introduced in embodiment 1.
The embodiments can see that, based on the transient safety and stability quantitative analysis theory and the method, on the basis of quantitatively evaluating the influence of the replacement of the conventional unit and the new energy on the transient voltage stability margin after the fault under the constraint fault of the power grid, the invention provides a new energy acceptance capacity quantitative estimation prediction scheme of the influence of the replacement of the new energy and the conventional unit on the transient voltage stability margin after the expected fault, which can provide rapid new energy acceptance capacity evaluation for the frequent replacement of the new energy output and the conventional unit output in the actual operation power grid, and keep the stability of the power grid.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method for determining new energy acceptance capability of a power grid in consideration of transient voltage constraint is characterized by comprising the following steps:
acquiring power grid topological data and acquiring power grid operation state data;
determining a constraint fault constrained by transient voltage in a current operation mode according to the power grid topological data and the operation state data;
calculating the sensitivity of the output of each conventional unit to the voltage of a preset power grid key node under the constraint fault;
and sequencing replaceable conventional units according to sensitivity, sequentially performing equal-capacity simulation replacement on the replaceable conventional units to form new energy units, responding to transient voltage instability of a system after any replacement, and determining the new energy acceptance capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
2. The method as claimed in claim 1, wherein the step of sequencing replaceable conventional units according to sensitivity, sequentially performing equal-capacity simulation replacement on the replaceable conventional units to obtain new energy units, and the step of determining the new energy acceptance under the transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement in response to transient voltage instability of the system after any replacement comprises the following steps:
for a replaceable conventional unit, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional unit into a new energy unit according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and taking the capacity of the new energy unit which is completely replaced after the last replacement as the maximum new energy accepting capacity under transient constraint of the current operation mode of a power grid;
and for the replaceable conventional units, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy source units according to the sequence of sensitivity from large to small, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy source units after the last replacement as the minimum new energy source accepting capacity under transient constraint of the current operation mode of the power grid.
3. The method of claim 1, wherein the determination of the constraint fault comprises:
determining a power grid mathematical model according to the power grid topological data;
determining the current operation mode of the power grid according to the operation state data;
according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault;
and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
4. A method according to claim 3, wherein at least one voltage safety binary table is provided for a plurality of expected faults in a predetermined set of expected faults, expressed as:
Figure FDA0002687180480000011
wherein N represents the number of voltage safety binary tables,
Figure FDA0002687180480000021
representing a given voltage offset threshold u in the ith voltage safety binary tablecr-iThe duration of (c).
5. The method as claimed in claim 1, wherein the method for calculating the sensitivity of each conventional unit to the voltage of the key node of the preset power grid under the constraint fault comprises the following steps:
respectively calculating system voltage stability margins for adjusting the output of each conventional unit under the constraint fault;
calculating the voltage-output sensitivity delta gamma of each replaceable conventional unit to the key node of the power grid according to the voltage stability margin of the systemjThe method comprises the following steps:
Δγj＝ηvj/Δpj
wherein eta isvjFor voltage stability margin, Δ p, corresponding to the jth conventional unitjAnd adjusting the output of the jth conventional unit.
6. The method according to claim 1, wherein the determination of the maximum new energy acceptance under transient constraints of the current operation mode of the power grid comprises the steps of:
s01, replacing the capacity of the conventional unit with the minimum sensitivity and the like with a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s02, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s03, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S04;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S01-S03;
and S04, stopping replacement, and taking the power grid operation mode after the last replacement as the maximum new energy receiving capacity of the current operation mode.
7. The method according to claim 1, wherein the determination of the minimum new energy acceptance under transient constraints of the current operation mode of the grid comprises the steps of:
s11, replacing the capacity of the conventional unit with the maximum sensitivity into a new energy unit for the conventional unit which can be replaced at present and is not replaced;
s12, calculating a system transient voltage stability margin under the constraint of the replaced transient voltage;
s13, judging whether the calculated transient voltage stability margin of the system is smaller than a preset threshold value:
in response to the transient voltage stability margin of the system being smaller than the preset threshold, proceeding to step S14;
responding to the fact that the transient voltage stability margin of the system is not smaller than a preset threshold value, calculating the sensitivity of each conventional unit which is not replaced under the constraint fault to the voltage of the preset power grid key node after the current replacement, and turning to the step S11-S13;
and S14, stopping replacement, and taking the power grid operation mode after the last replacement as the minimum new energy receiving capacity of the current operation mode.
8. An apparatus for determining new energy acceptance of a power grid considering transient voltage constraints, comprising:
the data acquisition module is configured for acquiring power grid topology data and acquiring power grid operation state data;
the constraint fault determination module is configured for determining a constraint fault constrained by the transient voltage in the current operation mode according to the power grid topology data and the operation state data;
the sensitivity calculation module is configured for calculating the sensitivity of the output of each conventional unit to the voltage of a key node of a preset power grid under the constraint fault;
and the new energy admission capacity determining module is configured for sequencing replaceable conventional units according to sensitivity, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy units, responding to transient voltage instability of a system after any replacement, and determining the new energy admission capacity under transient constraint of the current operation mode of the power grid according to the operation mode of the power grid after the last replacement.
9. The apparatus according to claim 8, wherein the new energy admission capacity determining module performs sorting according to sensitivity on replaceable conventional units, sequentially performs equal-capacity simulation replacement on the replaceable conventional units into new energy units, and determines the new energy admission capacity under transient constraint on the current operation mode of the power grid according to the operation mode of the power grid after the last replacement in response to transient voltage instability of the system after any one replacement, and includes:
for a replaceable conventional unit, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional unit into a new energy unit according to the sequence of sensitivity from small to large, responding to transient voltage instability of a system after any replacement, and taking the capacity of the new energy unit which is completely replaced after the last replacement as the maximum new energy accepting capacity under transient constraint of the current operation mode of a power grid;
and for the replaceable conventional units, sequentially carrying out equal-capacity simulation replacement on the replaceable conventional units into new energy source units according to the sequence of sensitivity from large to small, responding to transient voltage instability of a system after any replacement, and taking the capacity of all replaced new energy source units after the last replacement as the minimum new energy source accepting capacity under transient constraint of the current operation mode of the power grid.
10. The grid new energy admission capacity determining apparatus considering transient voltage constraints as claimed in claim 8, wherein the constraint fault determining module performs the constraint fault determination including:
determining a power grid mathematical model according to the power grid topological data;
determining the current operation mode of the power grid according to the operation state data;
according to a power grid mathematical model and a current operation mode of a power grid, carrying out power grid time domain simulation based on a preset expected fault set and a voltage safety binary table, and calculating a system voltage safety margin under each expected fault;
and selecting the expected fault corresponding to the minimum system voltage safety margin as the constraint fault.
CN202010979994.1A 2020-09-17 2020-09-17 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint Active CN112072715B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010979994.1A CN112072715B (en) 2020-09-17 2020-09-17 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010979994.1A CN112072715B (en) 2020-09-17 2020-09-17 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint

Publications (2)

Publication Number Publication Date
CN112072715A true CN112072715A (en) 2020-12-11
CN112072715B CN112072715B (en) 2022-06-24

Family

ID=73681671

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010979994.1A Active CN112072715B (en) 2020-09-17 2020-09-17 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint

Country Status (1)

Country Link
CN (1) CN112072715B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113241801A (en) * 2021-04-14 2021-08-10 国家电网公司华北分部 New energy critical permeability determination method and device based on voltage stability constraint
CN113297861A (en) * 2021-05-17 2021-08-24 国网电力科学研究院有限公司 Experimental method and system for evaluating new energy ultimate access capability in synchronous power grid

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014173131A1 (en) * 2013-04-23 2014-10-30 国家电网公司 Large power grid overall situation on-line integrated quantitative evaluation method based on response
CN104538972A (en) * 2014-12-12 2015-04-22 国网宁夏电力公司经济技术研究院 Reactive compensation configuration method and device based on transient voltage stability constraint
CN104882905A (en) * 2015-03-30 2015-09-02 国电南瑞科技股份有限公司 New energy available capability assessment method considering transient security constraints
WO2016037303A1 (en) * 2014-09-09 2016-03-17 国家电网公司 Evaluation method for online accommodating capacity of new energy power generation
CN106099993A (en) * 2016-06-28 2016-11-09 中国电力工程顾问集团西南电力设计院有限公司 A kind of adapt to the power source planning method that new forms of energy access on a large scale
CN110311419A (en) * 2019-07-01 2019-10-08 国电南瑞科技股份有限公司 New energy based on transient security nargin receives ability and minimum booting appraisal procedure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014173131A1 (en) * 2013-04-23 2014-10-30 国家电网公司 Large power grid overall situation on-line integrated quantitative evaluation method based on response
WO2016037303A1 (en) * 2014-09-09 2016-03-17 国家电网公司 Evaluation method for online accommodating capacity of new energy power generation
CN104538972A (en) * 2014-12-12 2015-04-22 国网宁夏电力公司经济技术研究院 Reactive compensation configuration method and device based on transient voltage stability constraint
CN104882905A (en) * 2015-03-30 2015-09-02 国电南瑞科技股份有限公司 New energy available capability assessment method considering transient security constraints
CN106099993A (en) * 2016-06-28 2016-11-09 中国电力工程顾问集团西南电力设计院有限公司 A kind of adapt to the power source planning method that new forms of energy access on a large scale
CN110311419A (en) * 2019-07-01 2019-10-08 国电南瑞科技股份有限公司 New energy based on transient security nargin receives ability and minimum booting appraisal procedure

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
叶超等: "基于枚举法的地区电网接纳风电能力评估", 《可再生能源》 *
叶超等: "基于枚举法的地区电网接纳风电能力评估", 《可再生能源》, no. 03, 20 March 2017 (2017-03-20), pages 89 - 98 *
毛安家等: "高比例新能源替代常规电源后系统暂态稳定与电压稳定的演化机理", 《中国电机工程学报》 *
毛安家等: "高比例新能源替代常规电源后系统暂态稳定与电压稳定的演化机理", 《中国电机工程学报》, no. 09, 6 March 2020 (2020-03-06), pages 14 - 25 *
马覃峰等: "考虑开机措施的暂态电压预防控制两阶段优化方法", 《南方电网技术》 *
马覃峰等: "考虑开机措施的暂态电压预防控制两阶段优化方法", 《南方电网技术》, no. 05, 20 May 2020 (2020-05-20), pages 65 - 70 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113241801A (en) * 2021-04-14 2021-08-10 国家电网公司华北分部 New energy critical permeability determination method and device based on voltage stability constraint
CN113241801B (en) * 2021-04-14 2023-06-30 国家电网公司华北分部 New energy critical permeability determination method and device based on voltage stability constraint
CN113297861A (en) * 2021-05-17 2021-08-24 国网电力科学研究院有限公司 Experimental method and system for evaluating new energy ultimate access capability in synchronous power grid
CN113297861B (en) * 2021-05-17 2022-08-30 国网电力科学研究院有限公司 Experimental method and system for evaluating new energy ultimate access capability in synchronous power grid

Also Published As

Publication number Publication date
CN112072715B (en) 2022-06-24

Similar Documents

Publication Publication Date Title
CN112072715B (en) Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint
CN110994704B (en) Transient stability prevention control aid decision-making method and device and electronic equipment
CN109638815B (en) Method for determining safety and stability prevention control strategy of medium-and-long-term voltage of power system
CN109524982B (en) AC/DC power grid transient stability risk assessment method
CN112383045A (en) Transient stability out-of-limit probability calculation method and device for new energy power generation uncertainty
CN106056305B (en) Power generation system reliability rapid evaluation method based on state clustering
CN111582630A (en) Method and system for determining low-voltage transformer area line loss rate evaluation value
CN109559019B (en) Power system dynamic security assessment method based on risk index
CN116739829B (en) Big data-based power data analysis method, system and medium
CN111680894B (en) Power grid safety and stability evaluation method, device and system
Zhao et al. Modified genetic algorithm in state space pruning for power system reliability evaluation and its parameter determination
CN113517693B (en) Weak voltage transient stability node analysis method and device
Garge et al. Control-relevant model identification of reactive extrusion processes
CN112579847A (en) Method and device for processing production data, storage medium and electronic equipment
CN116204771A (en) Power system transient stability key feature selection method, device and product
CN113627655B (en) Method and device for simulating and predicting pre-disaster fault scene of power distribution network
CN113901649A (en) Load parameter identification method, system and storage medium in frequency simulation
CN111541239A (en) Method and system for determining full-process dynamic voltage stability margin based on time domain simulation
CN110707695B (en) Transient power angle stability margin calculation method and system based on artificial intelligence
CN111697562B (en) SVM-based transient stability prevention control strategy generation method and device
CN112417643B (en) Thermal power generating unit maximum output real-time evaluation method and system based on blower current
CN112653129B (en) Transient power angle stability margin estimation method, device and system
CN111414718B (en) Reactive power output modeling method and system for synchronous phase modulator and storage medium
CN114386767B (en) Fault early warning method and system for power distribution operation and maintenance management system
CN113011481B (en) Electric energy meter function abnormality assessment method and system based on decision tree algorithm

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant