CN110994704B - Transient stability prevention control aid decision-making method and device and electronic equipment - Google Patents
Transient stability prevention control aid decision-making method and device and electronic equipment Download PDFInfo
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Abstract
The invention discloses a transient stability prevention control aid decision-making method, a transient stability prevention control aid decision-making device and electronic equipment, which are applied to transient stability prevention control decisions of a power system. The method realizes the online intelligent auxiliary decision of the transient stability prevention control of the power system, and can meet the requirements of calculation speed and accuracy.
Description
Technical Field
The invention belongs to the technical field of power system automation, and particularly relates to a transient stability prevention control aid decision method, a transient stability prevention control aid decision device and electronic equipment.
Background
Interconnection of large-area power grids, massive construction of direct-current transmission projects and continuous enlargement of scale of new energy power generation in the power grids, the complexity of power grid operation is increased, and the operation mode is increasingly close to the safe and stable operation limit. When the safety and stability problems of the power grid under the expected accident are detected, a dispatcher needs to take measures to implement preventive control, and the working point is moved from the outside of the stable domain to the inside of the stable domain. The prevention control auxiliary decision is an important function of the intelligent power grid dispatching control system, and the capability of quickly and correctly processing complex fault scenes is improved by providing decision support adaptive to an operation mode for dispatching operation personnel.
Transient stability preventive control is a challenging problem relative to other preventive control methods that are safe and stable. The transient stability problem has the essence of high dimension, strong time variation and strong nonlinearity, so the assistant decision calculation meeting the requirement of safety and stability is a complicated high-dimension nonlinear programming problem, and a solving method of mathematical programming is difficult to directly adopt. The heuristic method based on the control performance index is easy to meet the requirement on the adaptability of the calculation method in practical application, so that the method is more widely applied. The invention discloses a Chinese patent publication No. CN201510016088.0, the invention name of which relates to an online prevention control comprehensive decision-making method for multi-class safety and stability constraints, provides a method for searching online prevention control auxiliary decision-making control measures meeting the multi-class safety and stability constraint requirements based on control performance indexes of transient, dynamic and static safety and stability control performance indexes of 11 classes of safety and stability by adjusting measures of a generator, a load and a capacitive reactance. However, the heuristic method requires multiple iterations to continuously approximate the target solution, so the speed is slow and the calculation complexity is high.
Recent advances in big data analytics technology have provided new ideas for the solution of this problem. The operation mode of the power system has regularity and repeatability, relevant knowledge can be mined and extracted from mass data by machine learning of big data of a historical operation mode, an auxiliary decision suggestion of the current operation mode is given, and the requirement of prevention and control on the auxiliary decision calculation speed is met.
Disclosure of Invention
The invention aims to provide a transient stability prevention control auxiliary decision method, a transient stability prevention control auxiliary decision device and electronic equipment, which are used for the online intelligent auxiliary decision of the transient stability prevention control of a power system and can meet the requirements of calculation speed and accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a transient stability prevention control aid decision method, including:
acquiring operation state data of a power grid in a current operation mode;
performing transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode, and identifying transient instability faults;
for each transient instability fault, forming a control scheme set based on the control performance indexes;
performing enumeration combination of control schemes in the plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults;
performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model, and selecting prevention control auxiliary decision control measure suggestions;
and performing transient stability evaluation calculation of the expected faults on the preventive control auxiliary decision control measure suggestions, and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
Further, for each transient instability fault, forming a control scheme set based on the control performance indicators, including:
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
and forming a control scheme set in the sequencing queue, wherein the control power quantity is gradually increased according to the control precision requirement.
Furthermore, the control measures in the preventive control measure space include three types of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct-current power adjustment.
Further, the screening of the control measure based on the control performance index to obtain the effective control measure includes:
the active output adjustment control measure of the conventional unit meets the following condition (1), the active output adjustment control measure of the new energy unit meets the following condition (2), and the direct current power adjustment control measure meets the following condition (3) and is an effective control measure:
|PIg.i|≥PIg.th i＝1,2,…,ng (1)
|PIw.j|≥PIw.th j＝1,2,…,nw (2)
|PId.k|≥PId.th k＝1,2,…,nd (3)
wherein: PI (proportional integral)g.i,PIw.j,PId.kControl performance indexes of active output adjustment, new active output adjustment and direct current power adjustment of the conventional unit, PIg.th,PIw.th,PId.thThreshold value n of control performance index for adjusting active output of conventional unit, active output of new energy unit and DC powerg,nw,ndThe number of control measures for the active output adjustment of the conventional unit, the active output adjustment of the new energy unit and the direct current power adjustment in the preventive control measure space are respectively.
Further, the sorting the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost includes:
the effective control measures are divided into two types of power reduction and power increase, wherein the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, and the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, and the received direct current power is increased or the sent direct current power is reduced;
in each type of effective control measures, arranging three effective control measures of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct current power adjustment according to a priority order of the control measures which are specified in advance;
and sequencing the effective control measures in the same type from large to small according to the ratio of the absolute value of the control performance index to the unit control cost to obtain two types of effective control measure sequencing queues of power reduction and power increase.
Further, the forming a control scheme set in the sorting queue, where the control power amount is gradually increased according to the control accuracy requirement, includes:
in the effective control measure sequencing queue for power reduction, a plurality of control schemes delta P,2 delta P, …, n delta P for controlling the power quantity to be gradually increased are formed by taking the set control power precision delta P as a step length; wherein n is the number of control schemes, and n Δ P is less than or equal to the sum of all available control measure adjustable quantities for power reduction;
the control power amount of the control scheme is sequentially distributed to specific effective control measures according to the effective control measure queue sequence, the effective control measures with the front sequence are preferentially distributed until the maximum adjustment amount of the effective control measures is reached, the distribution is stopped after the control power amount of the control scheme is distributed, and the effective control measures distributed with the control power amount are the control measures of the control scheme; finally forming a plurality of power reduction control schemes;
forming a plurality of power increase control schemes in the power increase effective control measure ordering queue according to the same method;
and carrying out scheme matching in the power reduction control scheme set and the power increase control scheme set according to the principle that the total amount of control measures is adjusted to be equal, and combining effective control measures in the matched power reduction control scheme and the matched power increase control scheme to finally form a control scheme set aiming at the transient instability fault.
Further, performing enumeration combination of control schemes in the multiple transient instability fault control scheme sets to form a control scheme set meeting multiple transient instability fault control requirements, including:
at a plurality ofPerforming enumeration combination of control schemes among transient instability fault power reduction control scheme sets, wherein the combination number is
Wherein n isiReducing the number of control schemes in the set of control schemes for the ith transient destabilizing fault powerfThe total number of transient instability faults is;
checking whether repeated control measures exist in all control schemes of an enumeration combination, if so, reserving the control measures with larger adjustment quantity, and combining the control measures in all the control schemes to form an enumeration combination control scheme;
performing enumeration combination of control schemes among the power increase control scheme sets;
and combining the enumeration combination control schemes of power increase and power decrease to form a control scheme together according to a matching scheme of the principle that the power increase amount and the power decrease amount are the same, and finally forming an enumeration combination control scheme set meeting the control requirements of a plurality of transient instability faults.
Further, the matching scheme according to the principle that the power increase amount and the power decrease amount are the same, and the enumeration combination control scheme of power increase and power decrease is combined to form a control scheme, which includes:
traversing all control schemes in the power reduction enumeration combination control scheme set, searching a power increase control scheme with the closest control measure adjustment total amount in the power increase enumeration combination control scheme set aiming at each power reduction enumeration combination control scheme, matching the power increase control scheme and the power reduction control scheme successfully if the difference value of the control measure adjustment total amounts of the two control measure adjustment total amounts is smaller than the maximum unbalanced power allowed by the system, and combining the control measures in the power increase control scheme and the power reduction control scheme to form a control scheme;
and traversing all the control schemes which are not successfully matched in the power increase enumeration combination control scheme set, and matching the power decrease enumeration combination control scheme and the combination control scheme according to the same method.
Further, the transient stability classification prediction model is obtained by adopting a support vector machine model to train the stability and instability classification prediction model based on a historical operation mode and an expected fault set transient stability evaluation calculation result sample set.
Further, the selecting a preventive control aid decision control measure recommendation comprises:
and sequencing the schemes in the enumeration combination control scheme set which meets the control requirements of a plurality of transient instability faults according to the sequence from small to large of the ratio of the absolute value of the control performance index to the unit control cost, sequentially carrying out the transient stability classification prediction of all transient instability faults after the control scheme is adopted according to the sequencing result, and obtaining the preventive control auxiliary decision control measure suggestion if all the transient instability fault prediction results are transient stable under a certain control scheme.
Further, the performing transient stability evaluation calculation of the expected fault on the preventive control aid decision-making control measure suggestion and determining the preventive control aid decision-making control measure according to the transient stability evaluation calculation result includes:
if the calculation result meets the transient stability requirement, obtaining a preventive control assistant decision control measure, ending the assistant decision calculation process, otherwise,
and receiving the acquired prevention control aid decision control measure suggestions, acquiring an additional control measure by adopting a conventional prevention control aid decision calculation method on the basis, combining the original control measure and the additional control measure to be used as a final prevention control aid decision control measure, and ending an aid decision calculation process.
In a second aspect, the present invention provides a transient stability prevention control aid decision device, including:
the acquisition module is used for acquiring operation state data of the power grid in the current operation mode;
the identification module is used for carrying out transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode and identifying transient instability faults;
the computing module is used for forming a control scheme set for each transient instability fault based on the control performance index;
the combination module is used for performing enumeration combination on the control schemes in the plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults;
the pre-selection module is used for performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model and selecting prevention control auxiliary decision control measure suggestions;
and the decision module is used for carrying out transient stability evaluation calculation on the expected faults on the preventive control auxiliary decision control measure suggestions and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
Further, the computing module is specifically configured to,
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
and forming a control scheme set in the sequencing queue, wherein the control power quantity is gradually increased according to the control precision requirement.
Furthermore, the computing module is specifically further configured to,
the effective control measures are divided into two types of power reduction and power increase, wherein the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, and the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, and the received direct current power is increased or the sent direct current power is reduced;
in each type of effective control measures, arranging three effective control measures of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct current power adjustment according to a priority order of the control measures which are specified in advance;
within the same kind of effective control measures, the effective control measures are sorted from large to small according to the ratio of the absolute value of the control performance index to the unit control cost, and the decision module is specifically used for obtaining two effective control measure sorts of power reduction and power increase,
if the transient stability evaluation calculation result meets the transient stability requirement, obtaining a preventive control aid decision control measure, ending the aid decision calculation process, otherwise,
and receiving the acquired prevention control aid decision control measure suggestions, acquiring an additional control measure by adopting a conventional prevention control aid decision calculation method on the basis, combining the original control measure and the additional control measure to be used as a final prevention control aid decision control measure, and ending an aid decision calculation process.
In a third aspect, the present invention provides a computer readable storage medium storing one or more programs that, when executed by an electronic device including a plurality of application programs, cause the electronic device to:
acquiring operation state data of a power grid in a current operation mode;
performing transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode, and identifying transient instability faults;
for each transient instability fault, forming a control scheme set based on the control performance indexes;
performing enumeration combination of control schemes in the plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults;
performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model, and selecting prevention control auxiliary decision control measure suggestions;
and performing transient stability evaluation calculation of the expected faults on the preventive control auxiliary decision control measure suggestions, and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
In a fourth aspect, the present invention provides an electronic device, comprising a processor and a memory, wherein the memory is used for storing a computer program executable by the processor, and the processor implements the above-mentioned transient stability prevention control aid decision method when executing the computer program.
Compared with the prior art, the invention has the following beneficial effects:
the method adopts a machine learning method to obtain an expected fault transient stability classification prediction model aiming at a historical operation mode sample set, carries out transient stability prediction on enumeration combination control schemes of different transient instability faults on the basis of current operation mode expected fault transient stability evaluation and control measure control performance index calculation, selects a scheme which meets the transient stability requirement and has the minimum control cost as a preventive control auxiliary decision control measure suggestion, realizes the online intelligent auxiliary decision of the transient stability preventive control of the power system, and can meet the requirements of calculation speed and accuracy.
Drawings
Fig. 1 is a flow chart of an auxiliary decision method for transient stability prevention control of a power system according to the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example one
Referring to fig. 1, the present invention provides a transient stability prevention control aid decision method, including:
step 1: and acquiring operation state data of the power grid in the current operation mode.
Step 2: and (3) performing transient stability evaluation calculation on all faults in the expected fault set based on the current running state data to judge whether transient instability faults exist, if so, turning to the step 3, and otherwise, ending the auxiliary decision calculation process.
And step 3: for each transient instability fault, forming a control scheme set based on the control performance indicators, including:
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
and forming a control scheme set in the sequencing queue, wherein the control power quantity is gradually increased according to the control precision requirement.
Further, in the embodiment of the present invention, the control measures in the preventive control measure space include the active output adjustment of the conventional unit, the active output adjustment of the new energy unit, and the direct current power adjustment.
Further, in the embodiment of the present invention, a method for calculating control performance indexes of all control measures in a space for calculating preventive control measures is disclosed in chinese patent publication No. CN 201510016088.0.
Further, in the embodiment of the present invention, the screening of the control measure based on the control performance index to obtain the effective control measure includes:
effective control measures are adopted when the following conditions are met, wherein the active output adjustment control measures of the conventional unit meet the condition (1), the active output adjustment control measures of the new energy unit meet the condition (2), and the direct-current power adjustment control measures meet the condition (3):
|PIg.i|≥PIg.th i＝1,2,…,ng (1)
|PIw.j|≥PIw.th j＝1,2,…,nw (2)
|PId.k|≥PId.th k＝1,2,…,nd (3)
wherein: PI (proportional integral)g.i,PIw.j,PId.kRespectively adjusting the active output of the conventional unit, the active output of the new energy unit and the direct current powerIntegral control performance index, PIg.th,PIw.th,PId.thThreshold values (usually 0.1) of control performance indexes for adjusting the active output of a conventional unit, the active output of a new energy unit and the direct current power respectively, ng,nw,ndThe number of control measures for the active output adjustment of the conventional unit, the active output adjustment of the new energy unit and the direct current power adjustment in the preventive control measure space are respectively.
Further, in the embodiment of the present invention, the sorting the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost includes:
the effective control measures are divided into two types of power reduction and power increase, the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, the received direct current power is increased or the sent direct current power is reduced.
In each type of effective control measures, firstly, the three types of effective control measures, namely the active output adjustment of the conventional unit, the active output adjustment of the new energy unit and the direct current power adjustment, are arranged according to the priority order of the control measures which are specified in advance. Then, sorting the control measures in the same kind of control measures (the same kind refers to the control measures for regulating the active output of the conventional unit belonging to one kind, the control measures for regulating the active output of the new energy unit belonging to one kind, and the control measures for regulating the direct current power belonging to one kind) from large to small according to the ratio of the absolute value of the control performance index to the unit control cost, thereby obtaining two effective control measure sorting queues of power reduction and power increase.
Further, in the embodiment of the present invention, a control scheme set is formed in the sorting queue, where the control power amount is gradually increased according to the control accuracy requirement, and the control scheme set includes:
in the power reduction effective control measure sequencing queue, a plurality of control schemes Δ P,2 Δ P, … with the control power quantity gradually increased are formed by taking the set control power precision Δ P as a step size, n Δ P is the number of the control schemes, and n Δ P is less than or equal to the sum of all adjustable quantities of the power reduction effective control measures. And sequentially distributing the control power quantity of each control scheme to specific control measures according to the control measure queue sequence, preferentially distributing the control measures with the top sequence until the maximum adjustment quantity of the control measures is reached, stopping distribution after the control scheme control power quantity is distributed, wherein the control measure distributed by the control measure in the control scheme is the control measure of the control scheme, and the control power quantity distributed by the control measure in the control scheme is the power adjustment quantity of the control measure.
A plurality of power increase control measure control schemes are formed in a power increase active control measure ordering queue in the same manner. And carrying out scheme matching in the power reduction control scheme set and the power increase control scheme set according to the principle that the total amount of control measures is equal, and combining the control measures in the matched power reduction control scheme and the matched power increase control scheme to finally form a control scheme set aiming at the transient instability fault.
And 4, step 4: if a plurality of transient instability faults exist, performing enumeration combination on control schemes in a plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults; the method comprises the following specific steps:
performing enumeration combination of control schemes among multiple transient instability fault power reduction control scheme sets, wherein the combination number is
Wherein n isiReducing the number of control schemes in the set of control schemes for the ith transient destabilizing fault powerfThe total number of transient instability faults.
And checking whether repeated control measures exist in all control schemes of an enumeration combination, if so, reserving the control measures with larger adjustment quantity, and combining the control measures in all the control schemes to form the enumeration combination control scheme.
Performing enumeration combination of control schemes among the power increase control scheme sets according to the same method, and then matching the power increase control scheme and the power decrease control scheme according to the principle that the power increase amount and the power decrease amount are the same: firstly, traversing all control schemes in a power reduction enumeration combination control scheme set, searching a power increase control scheme with the closest control measure adjustment total amount in the power increase enumeration combination control scheme set aiming at each power reduction control scheme, if the difference value of the control measure adjustment total amounts of the two control measure adjustment total amounts is smaller than the maximum unbalanced power allowed by a system, considering that the power increase scheme and the power reduction control scheme are successfully matched, and combining the control measures in the power increase control scheme and the power reduction control scheme to jointly form a control scheme. And traversing all the control schemes which are not successfully matched in the power increasing enumeration combination control scheme set, matching the power reducing control scheme and combining the control schemes according to the same method, and finally forming the enumeration combination control scheme set which meets the control requirements of a plurality of transient instability faults.
And 5: adopting a pre-constructed transient stability classification prediction model to perform stability and instability classification prediction on the schemes in the control scheme set after enumeration combination, and selecting the scheme which meets the transient stability requirement and has the minimum ratio of the absolute value of the control performance index to the unit control cost as a preventive control auxiliary decision control measure suggestion;
further, in the embodiment of the invention, the transient stability classification prediction model is obtained by adopting a support vector machine model to train the stability and instability classification prediction model based on the historical operation mode and the transient stability evaluation calculation result sample set of the expected fault set.
Further, in the embodiment of the present invention, a scheme that satisfies the transient stability requirement and has the smallest ratio of the absolute value of the control performance index to the unit control cost is selected as the suggested method of the preventive control aid decision control measure, where:
and sequencing the schemes in the enumeration combination control scheme set which meets the control requirements of a plurality of transient instability faults according to the sequence from the absolute value of the control performance index to the unit control cost ratio from small to large, sequentially carrying out the transient stability classification prediction of all transient instability faults after the control scheme is adopted according to the sequencing result, and obtaining the preventive control auxiliary decision control measure suggestion if all the transient instability fault prediction results are transient stable under a certain control scheme.
Step 6: and (4) performing transient stability evaluation calculation of the expected faults on the preventive control aid decision control measure suggestions, if the transient stability requirements are met, obtaining the preventive control aid decision control measures, ending the aid decision calculation process, and otherwise, turning to the step 7.
And 7: and receiving the acquired prevention control aid decision-making control measure suggestions, acquiring additional control measures by adopting a conventional prevention control aid decision-making calculation method on the basis, combining the original control measures and the additional control measures to be used as final prevention control aid decision-making control measures, and ending an aid decision-making calculation process.
Example two
An embodiment of the present invention provides an auxiliary decision device for transient stability prevention control, including:
the acquisition module is used for acquiring operation state data of the power grid in the current operation mode;
the identification module is used for carrying out transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode and identifying transient instability faults;
the computing module is used for forming a control scheme set for each transient instability fault based on the control performance index;
the combination module is used for performing enumeration combination on the control schemes in the plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults;
the pre-selection module is used for performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model and selecting prevention control auxiliary decision control measure suggestions;
and the decision module is used for carrying out transient stability evaluation calculation on the expected faults on the preventive control auxiliary decision control measure suggestions and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
Further, the computing module is specifically configured to,
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
and forming a control scheme set in the sequencing queue, wherein the control power quantity is gradually increased according to the control precision requirement.
Furthermore, the computing module is specifically further configured to,
the effective control measures are divided into two types of power reduction and power increase, wherein the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, and the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, and the received direct current power is increased or the sent direct current power is reduced;
in each type of effective control measures, arranging three effective control measures of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct current power adjustment according to a priority order of the control measures which are specified in advance;
and sequencing the effective control measures of power reduction and power increase from large to small according to the ratio of the absolute value of the control performance index to the unit control cost in the effective control measures of the same type.
Further, the decision module is specifically configured to,
if the transient stability evaluation calculation result meets the transient stability requirement, obtaining a preventive control aid decision control measure, ending the aid decision calculation process, otherwise,
and receiving the acquired prevention control aid decision control measure suggestions, acquiring an additional control measure by adopting a conventional prevention control aid decision calculation method on the basis, combining the original control measure and the additional control measure to be used as a final prevention control aid decision control measure, and ending an aid decision calculation process.
It is to be noted that the apparatus embodiment corresponds to the method embodiment, and the implementation manners of the method embodiment are all applicable to the apparatus embodiment and can achieve the same or similar technical effects, so that the details are not described herein.
EXAMPLE III
An embodiment of the present invention provides an electronic device, including a processor and a memory, where the memory is used to store a computer program executable by the processor, and the processor implements the above transient stability prevention control aid decision method when executing the computer program.
On the hardware level, the electronic device optionally comprises an internal bus, a network interface and a memory besides the processor. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a Non-Volatile Memory (Non-Volatile Memory), such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, the network interface, and the memory may be interconnected by an internal bus, which may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc.
And the memory is used for storing programs. In particular, the program may include program code comprising computer operating instructions. The memory may include both memory and non-volatile storage and provides instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the computer program to form the privacy transaction device on the logic level. And the processor is used for executing the program stored in the memory and is specifically used for executing the method operation executed when the server is taken as an execution main body.
The method disclosed in the first embodiment of the present disclosure may be applied to a processor, or may be implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present specification may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present specification may be embodied directly in a hardware decoding processor, or in a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
The electronic device may further execute the method of the first embodiment of the present invention, and implement the functions of the apparatus shown in the second embodiment, which are not described herein again.
Of course, besides the software implementation, the electronic device of the embodiment of the present disclosure does not exclude other implementations, such as a logic device or a combination of software and hardware, and the like, that is, the execution subject of the following processing flow is not limited to each logic unit, and may also be hardware or a logic device.
The present specification embodiments provide a computer readable storage medium storing one or more programs that, when executed by an electronic device including a plurality of application programs, cause the electronic device to perform operations comprising:
acquiring operation state data of a power grid in a current operation mode;
performing transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode, and identifying transient instability faults;
for each transient instability fault, forming a control scheme set based on the control performance indexes;
performing enumeration combination of control schemes in the plurality of transient instability fault control scheme sets to form a control scheme set meeting the control requirements of the plurality of transient instability faults;
performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model, and selecting prevention control auxiliary decision control measure suggestions;
and performing transient stability evaluation calculation of the expected faults on the preventive control auxiliary decision control measure suggestions, and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A transient stability prevention control aid decision method is characterized by comprising the following steps:
acquiring operation state data of a power grid in a current operation mode;
performing transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode, and identifying transient instability faults;
for each transient instability fault, forming a control scheme set based on the control performance indexes; performing enumeration combination of control schemes in the transient instability fault control scheme sets to form an enumeration combination control scheme set meeting the control requirements of the transient instability faults;
performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model, and selecting prevention control auxiliary decision control measure suggestions;
transient stability evaluation calculation of the expected faults is carried out on the preventive control auxiliary decision control measure suggestions, and the preventive control auxiliary decision control measures are determined according to transient stability evaluation calculation results;
for each transient instability fault, forming a control scheme set based on the control performance index, including:
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
forming a control scheme set for controlling the power quantity to be gradually increased according to the control precision requirement in the sequencing queue;
performing enumeration combination of control schemes in the multiple transient instability fault control scheme sets to form an enumeration combination control scheme set meeting multiple transient instability fault control requirements, including:
performing enumeration combination of control schemes among multiple transient instability fault power reduction control scheme sets, wherein the combination number is
Wherein n isiReducing the number of control schemes in the set of control schemes for the ith transient destabilizing fault powerfThe total number of transient instability faults is;
checking whether repeated control measures exist in all control schemes of an enumeration combination, if so, reserving the control measures with larger adjustment quantity, and combining the control measures in all the control schemes to form an enumeration combination control scheme;
performing enumeration combination of control schemes among the power increase control scheme sets;
and combining the enumeration combination control schemes of power increase and power decrease to form a control scheme together according to a matching scheme of the principle that the power increase amount and the power decrease amount are the same, and finally forming an enumeration combination control scheme set meeting the control requirements of a plurality of transient instability faults.
2. The decision-making method for transient stability prevention and control as claimed in claim 1, wherein the control measures in the prevention and control measure space include three of regular unit active power output adjustment, new energy unit active power output adjustment and dc power adjustment.
3. The decision-making method for transient stability prevention and control as claimed in claim 2, wherein the screening of the control measure based on the control performance index to obtain the effective control measure comprises:
the active output adjustment control measure of the conventional unit meets the following condition (1), the active output adjustment control measure of the new energy unit meets the following condition (2), and the direct current power adjustment control measure meets the following condition (3) and is an effective control measure:
|PIg.i|≥PIg.th i＝1,2,…,ng (1)
|PIw.j|≥PIw.th j＝1,2,…,nw (2)
|PId.k|≥PId.th k＝1,2,…,nd (3)
wherein: PI (proportional integral)g.i,PIw.j,PId.kControl performance indexes of active output adjustment, new active output adjustment and direct current power adjustment of the conventional unit, PIg.th,PIw.th,PId.thThreshold value n of control performance index for adjusting active output of conventional unit, active output of new energy unit and DC powerg,nw,ndThe number of control measures for the active output adjustment of the conventional unit, the active output adjustment of the new energy unit and the direct current power adjustment in the preventive control measure space are respectively.
4. The transient stability prevention control aid decision method as claimed in claim 2, wherein the sorting of the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost comprises:
the effective control measures are divided into two types of power reduction and power increase, wherein the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, and the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, and the received direct current power is increased or the sent direct current power is reduced;
in each type of effective control measures, arranging three effective control measures of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct current power adjustment according to a priority order of the control measures which are specified in advance;
and sequencing the effective control measures in the same type from large to small according to the ratio of the absolute value of the control performance index to the unit control cost to obtain two types of effective control measure sequencing queues of power reduction and power increase.
5. The transient stability prevention control aid decision method according to claim 4, wherein the forming of the control scheme set with the control power quantity gradually increasing according to the control accuracy requirement in the sequencing queue comprises:
in the effective control measure sequencing queue for power reduction, a plurality of control schemes delta P,2 delta P, …, n delta P for controlling the power quantity to be gradually increased are formed by taking the set control power precision delta P as a step length; wherein n is the number of control schemes, and n Δ P is less than or equal to the sum of all available control measure adjustable quantities for power reduction;
the control power amount of the control scheme is sequentially distributed to specific effective control measures according to the effective control measure queue sequence, the effective control measures with the front sequence are preferentially distributed until the maximum adjustment amount of the effective control measures is reached, the distribution is stopped after the control power amount of the control scheme is distributed, and the effective control measures distributed with the control power amount are the control measures of the control scheme; finally forming a plurality of power reduction control schemes;
forming a plurality of power increase control schemes in the power increase effective control measure ordering queue according to the same method;
and carrying out scheme matching in the power reduction control scheme set and the power increase control scheme set according to the principle that the total amount of control measures is adjusted to be equal, and combining effective control measures in the matched power reduction control scheme and the matched power increase control scheme to finally form a control scheme set aiming at the transient instability fault.
6. The decision-making method for transient stability prevention control as claimed in claim 1, wherein the merging the enumerated combination control schemes of power increase and power decrease into one control scheme according to the matching scheme with the same principle of power increase and power decrease comprises:
traversing all control schemes in the power reduction enumeration combination control scheme set, searching a power increase control scheme with the closest control measure adjustment total amount in the power increase enumeration combination control scheme set aiming at each power reduction enumeration combination control scheme, matching the power increase control scheme and the power reduction control scheme successfully if the difference value of the control measure adjustment total amounts of the two control measure adjustment total amounts is smaller than the maximum unbalanced power allowed by the system, and combining the control measures in the power increase control scheme and the power reduction control scheme to form a control scheme;
and traversing all the control schemes which are not successfully matched in the power increase enumeration combination control scheme set, and matching the power decrease enumeration combination control scheme and the combination control scheme according to the same method.
7. The transient stability prevention control aid decision-making method according to claim 1, wherein the transient stability classification prediction model is obtained by performing stability and instability classification prediction model training using a support vector machine model based on a historical operation mode and a sample set of transient stability evaluation calculation results of an expected failure set thereof.
8. The transient stability prevention control aid decision method as claimed in claim 1, wherein the prevention control aid decision control measure recommendation comprises:
and sequencing the schemes in the enumeration combination control scheme set which meets the control requirements of a plurality of transient instability faults according to the sequence from small to large of the ratio of the absolute value of the control performance index to the unit control cost, sequentially carrying out the transient stability classification prediction of all transient instability faults after the control scheme is adopted according to the sequencing result, and obtaining the preventive control auxiliary decision control measure suggestion if all the transient instability fault prediction results are transient stable under a certain control scheme.
9. The transient stability prevention control aid decision method according to claim 8, wherein the performing a transient stability assessment calculation of the predicted fault on the prevention control aid decision control measure recommendation, and determining the prevention control aid decision control measure according to the transient stability assessment calculation result comprises:
if the calculation result meets the transient stability requirement, obtaining a preventive control assistant decision control measure, ending the assistant decision calculation process, otherwise,
and receiving the acquired prevention control aid decision control measure suggestions, acquiring an additional control measure by adopting a conventional prevention control aid decision calculation method on the basis, combining the original control measure and the additional control measure to be used as a final prevention control aid decision control measure, and ending an aid decision calculation process.
10. A transient stability prevention control aid decision device, comprising:
the acquisition module is used for acquiring operation state data of the power grid in the current operation mode;
the identification module is used for carrying out transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode and identifying transient instability faults;
the calculation module is specifically configured to,
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
forming a control scheme set for controlling the power quantity to be gradually increased according to the control precision requirement in the sequencing queue;
the combination module is particularly useful for,
performing enumeration combination of control schemes among multiple transient instability fault power reduction control scheme sets, wherein the combination number is
Wherein n isiReducing the number of control schemes in the set of control schemes for the ith transient destabilizing fault powerfThe total number of transient instability faults is;
checking whether repeated control measures exist in all control schemes of an enumeration combination, if so, reserving the control measures with larger adjustment quantity, and combining the control measures in all the control schemes to form an enumeration combination control scheme;
performing enumeration combination of control schemes among the power increase control scheme sets;
according to the matching scheme of the principle that the power increase amount and the power decrease amount are the same, the enumeration combination control schemes of the power increase and the power decrease are combined to form a control scheme, and finally an enumeration combination control scheme set meeting the control requirements of a plurality of transient instability faults is formed;
the pre-selection module is used for performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model and selecting prevention control auxiliary decision control measure suggestions;
and the decision module is used for carrying out transient stability evaluation calculation on the expected faults on the preventive control auxiliary decision control measure suggestions and determining the preventive control auxiliary decision control measures according to the transient stability evaluation calculation results.
11. The transient stability prevention control aid decision device as claimed in claim 10, wherein the computing module is further configured to,
the effective control measures are divided into two types of power reduction and power increase, wherein the power reduction type comprises that the conventional unit reduces active output, the received direct current power is reduced or the sent direct current power is increased, and the new energy unit reduces the active output, and the power increase type comprises that the conventional unit increases the active output, and the received direct current power is increased or the sent direct current power is reduced;
in each type of effective control measures, arranging three effective control measures of active output adjustment of a conventional unit, active output adjustment of a new energy unit and direct current power adjustment according to a priority order of the control measures which are specified in advance;
and sequencing the effective control measures in the same type from large to small according to the ratio of the absolute value of the control performance index to the unit control cost to obtain two types of effective control measure sequencing queues of power reduction and power increase.
12. The transient stability prevention control aid decision making device as claimed in claim 10, wherein the decision making module is specifically configured to,
if the transient stability evaluation calculation result meets the transient stability requirement, obtaining a preventive control aid decision control measure, ending the aid decision calculation process, otherwise,
and receiving the acquired prevention control aid decision control measure suggestions, acquiring an additional control measure by adopting a conventional prevention control aid decision calculation method on the basis, combining the original control measure and the additional control measure to be used as a final prevention control aid decision control measure, and ending an aid decision calculation process.
13. A computer-readable storage medium storing one or more programs which, when executed by an electronic device including a plurality of application programs, cause the electronic device to:
acquiring operation state data of a power grid in a current operation mode;
performing transient stability evaluation calculation on all faults in the expected fault set based on the running state data in the current running mode, and identifying transient instability faults;
for each transient instability fault, forming a control scheme set based on the control performance indexes;
performing enumeration combination of control schemes in the transient instability fault control scheme sets to form an enumeration combination control scheme set meeting the control requirements of the transient instability faults;
performing stable and unstable classification prediction on the control schemes in the enumeration combination control scheme set by adopting a transient stable classification prediction model, and selecting prevention control auxiliary decision control measure suggestions;
transient stability evaluation calculation of the expected faults is carried out on the preventive control auxiliary decision control measure suggestions, and the preventive control auxiliary decision control measures are determined according to transient stability evaluation calculation results;
for each transient instability fault, forming a control scheme set based on the control performance index, including:
for each transient instability fault, respectively calculating the control performance indexes of all control measures in a preventive control measure space;
screening control measures based on the control performance indexes to obtain effective control measures;
sequencing the effective control measures according to the ratio of the absolute value of the control performance index to the unit control cost;
forming a control scheme set for controlling the power quantity to be gradually increased according to the control precision requirement in the sequencing queue;
performing enumeration combination of control schemes in the multiple transient instability fault control scheme sets to form an enumeration combination control scheme set meeting multiple transient instability fault control requirements, including:
performing enumeration combination of control schemes among multiple transient instability fault power reduction control scheme sets, wherein the combination number is
Wherein n isiReducing the number of control schemes in the set of control schemes for the ith transient destabilizing fault powerfThe total number of transient instability faults is;
checking whether repeated control measures exist in all control schemes of an enumeration combination, if so, reserving the control measures with larger adjustment quantity, and combining the control measures in all the control schemes to form an enumeration combination control scheme;
performing enumeration combination of control schemes among the power increase control scheme sets;
and combining the enumeration combination control schemes of power increase and power decrease to form a control scheme together according to a matching scheme of the principle that the power increase amount and the power decrease amount are the same, and finally forming an enumeration combination control scheme set meeting the control requirements of a plurality of transient instability faults.
14. An electronic device comprising a processor and a memory for storing a computer program executable by the processor, the processor implementing the method of any one of claims 1-9 when executing the computer program.
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