CN109088427A - Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid - Google Patents
Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid Download PDFInfo
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- CN109088427A CN109088427A CN201810813956.1A CN201810813956A CN109088427A CN 109088427 A CN109088427 A CN 109088427A CN 201810813956 A CN201810813956 A CN 201810813956A CN 109088427 A CN109088427 A CN 109088427A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses conventional power unit minimum booting schemes in a kind of AC-DC hybrid power grid to determine method and system, which comprises establishes BPA Power flow simulation model according to generating set feature each in AC-DC hybrid power grid；It determines the original start-up mode of each conventional power unit in AC-DC hybrid power grid, and obtains the DC engineering of AC-DC hybrid power grid under the original start-up mode and send power outside；The start-up mode includes the booting quantity of each conventional power unit；The start-up mode of each conventional power unit is adjusted one by one, and the DC engineering for calculating the AC-DC hybrid power grid under every kind of start-up mode sends power threshold outside, and exports the adjustment impact evaluation index under corresponding each way；Start-up mode is updated by preset rules according to adjustment impact evaluation index, and using assessing under the start-up mode of BPA Power flow simulation model in the updated AC-DC hybrid power grid N-1 security and stability, determines minimum booting scheme.
Description
Technical field
The present invention relates to technical field of electric power, minimum more particularly, to conventional power unit in a kind of AC-DC hybrid power grid
Booting scheme determines method and system.
Background technique
The distribution of the new energy such as China's wind energy, solar energy is concentrated and load center is apart from farther out, and local consumption scale is limited,
The a wide range of consumption of the new energy such as " three Norths " regional wind-powered electricity generation, solar energy is main at present relies on extra-high voltage direct-current channel to concentrate at a distance
Completion is sent outside.
With the increasingly increase of new-energy grid-connected scale, installation ratio shared by normal power supplies substantially reduces, photovoltaic and wind-powered electricity generation
Equal new energy power supply has been substituted the leading position of traditional energy, and important change has occurred in AC-DC hybrid power grid power supply architecture,
System Ability of Resisting Disturbance reduces.And with the construction of extra-high voltage direct-current engineering, it is mixed that AC-DC hybrid power grid translates into alternating current-direct current
Join power grid, the principal element for influencing sending end AC-DC hybrid power grid stability will focus on direct current near region.Occur in direct current near region
When AC fault, since in new energy big hair, normal power supplies booting is restricted, system dynamic reactive-load deposit will substantially
Decline, and when Voltage Drop, reactive loss will be significantly increased during AC fault in new energy unit, therefore after the AC fault of near region
The problems such as easily causing direct current reversing failure, and then causing generator rotor angle, voltage, frequency caused by trend shifts on a large scale, alternating current-direct current
There is the operation risk for stablizing broken ring in serial-parallel power grid.
Summary of the invention
In order to solve to account in super a high proportion of AC-DC hybrid power grid in new energy in direct current near region existing for background technique
The problem of AC-DC hybrid power grid operation stability difference when AC fault occurs, the present invention provides a kind of AC-DC hybrid power grids
Interior conventional power unit minimum booting scheme determines method and system, which comprises
BPA Power flow simulation model is established according to generating set feature each in AC-DC hybrid power grid；The generating set packet
Include new energy unit and conventional power unit；The conventional power unit includes Hydropower Unit and fired power generating unit；
It determines the original start-up mode of each conventional power unit in AC-DC hybrid power grid, and obtains in the original booting
The DC engineering of AC-DC hybrid power grid sends power outside under mode；The start-up mode includes the booting quantity of each conventional power unit；
The start-up mode of each conventional power unit is adjusted one by one, calculates the straight of the AC-DC hybrid power grid under every kind of start-up mode
Stream engineering sends power threshold outside, and exports the adjustment impact evaluation index of corresponding power plant's single unit；
Start-up mode is updated by preset rules according to adjustment impact evaluation index, and using BPA Power flow simulation model more
AC-DC hybrid power grid N-1 security and stability is assessed under start-up mode after new, determines minimum booting scheme.
Further, joined according to the feature of the composition of generating set each in AC-DC hybrid power grid, AC-DC hybrid power grid
Number builds BPA Power flow simulation model；The characteristic parameter of the AC-DC hybrid power grid include each generating set grid structure,
Generator parameter, load parameter, line parameter circuit value, transformer parameter and DC engineering parameter.
Further, the start-up mode for adjusting each conventional power unit one by one, the friendship calculated under every kind of start-up mode are straight
The DC engineering of stream serial-parallel power grid sends power outside, and exports the adjustment impact evaluation index under each way, comprising:
On the basis of original start-up mode, a unit of each conventional power plant is shut down, one by one with alternating current-direct current mixed connection
The permanent N-1 failure of power grid AC three-phase and direct current monopole locking failure are limit restrictive condition, obtain the feelings for shutting down this unit
DC engineering under condition sends power threshold outside；
Under the start-up mode for shutting down this unit, the calculating of the adjustment impact evaluation index of corresponding power plant's single unit
Formula are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower pole is sent outside for DC engineering in this case
Limit value；PDCDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
Further, it is influenced according to the adjustment that the single unit for shutting down each conventional power plant exports corresponding each case
Evaluation index；Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, each conventional power plant is obtained and shuts down a single unit pair
The influence ranking results of alternating current-direct current mixed connection sending end power grid AC-DC hybrid power grid DC stabilization operation.
It is further, described that start-up mode is updated by preset rules according to adjustment impact evaluation index, comprising:
Step 1, the conventional power plant that a unit is only run under current start-up mode is switched on platform in minimum booting scheme
Number is set as 1；
Step 2, being shut down to adjust in remaining conventional power plant in AC-DC hybrid power grid according to the influence ranking results influences
A unit in the maximum conventional power plant of evaluation index forms a suboptimization of generating set start-up mode；
Step 3, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
If assessment result passes through, return step 1 is executed under the start-up mode for completing this suboptimization；
If assessment result does not pass through, number of units which is switched in minimum booting scheme is set as this suboptimization
Preceding number of units, and the conventional power plant is deleted in the influence ranking results, return step 2 executes；
Step 4, it after the completion of booting number of units of all conventional power plants in minimum booting scheme being respectively provided with, exports the smallest
Booting scheme.
Further, before the start-up mode for adjusting each conventional power unit one by one, which comprises
Using BPA Power flow simulation model under original start-up mode to AC-DC hybrid power grid N-1 security and stability into
Row assessment；
The start-up mode is updated according to assessment result.
Further, safe to AC-DC hybrid power grid N-1 under original start-up mode using BPA Power flow simulation model
The result that stability is assessed is obstructed out-of-date, which comprises
Step 1, the conventional power plant that units all under current start-up mode are all run is switched in minimum booting scheme
Number of units is set as its corresponding whole unit number of units；
Step 2, being opened to adjust in remaining conventional power plant in AC-DC hybrid power grid according to the influence ranking results influences
A unit in the maximum conventional power plant of evaluation index forms a suboptimization of generating set start-up mode；
Step 3, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
If assessment result passes through, before number of units which is switched in minimum booting scheme is set as this suboptimization
Number of units, and the conventional power plant is deleted in the influence ranking results, return step 2 executes；
If assessment result does not pass through, return step 1 is executed under the start-up mode for completing this suboptimization；
Step 4, by after the completion of booting number of units of all conventional power plants in minimum booting scheme is respectively provided with, institute is screened out
There is the conventional power plant that unit has all been run, the smallest power plant of single unit capacity is chosen from remaining power plant, its minimum is opened
Board number increases by one, remaining power plant's minimum booting number of units then remains unchanged, and exports the smallest booting of whole conventional power plants
Scheme.
It is further, described that AC-DC hybrid power grid N-1 security and stability is assessed, comprising:
It is short that AC-DC hybrid power grid main grid structure route, the permanent N-1 of main transformer three-phase are calculated according to BPA Power flow simulation model emulation
Road failure, simulation calculation AC-DC hybrid power grid direct current single-stage are latched failure；
According to preset unit generator rotor angle, system voltage, system frequency stability criterion, to alternating current-direct current mixed connection electricity after failure
The Transient Stability Level of net is determined.
Conventional power unit minimum booting scheme determines system in a kind of AC-DC hybrid power grid, the system comprises:
Building of Simulation Model unit, the Building of Simulation Model unit are used for according to generator each in AC-DC hybrid power grid
Group feature establishes BPA Power flow simulation model；The generating set includes new energy unit and conventional power unit；The conventional power unit
Including Hydropower Unit and fired power generating unit；
Start-up mode adjustment unit, the start-up mode adjustment unit determine each conventional power unit in AC-DC hybrid power grid
Original start-up mode, and obtain the DC engineering of AC-DC hybrid power grid under the original start-up mode and send power outside；
The start-up mode includes the booting quantity of each conventional power unit；
The start-up mode adjustment unit adjusts the start-up mode of each conventional power unit one by one, calculates under every kind of start-up mode
The DC engineering of AC-DC hybrid power grid send power threshold outside, and export the adjustment impact evaluation of corresponding power plant's single unit
Index；
Start-up mode optimizes unit, updates start-up mode by preset rules according to adjustment impact evaluation index, determines minimum
Booting scheme；
Stability assessment unit, the BPA tide that the stability assessment unit is used to establish using Building of Simulation Model unit
Stream simulation model assesses AC-DC hybrid power grid N-1 security and stability.
Further, the Building of Simulation Model unit according to the composition of generating set each in AC-DC hybrid power grid, hand over
The characteristic parameter of direct current serial-parallel power grid builds BPA Power flow simulation model；The characteristic parameter of the AC-DC hybrid power grid includes every
Grid structure, generator parameter, load parameter, line parameter circuit value, transformer parameter and the DC engineering parameter of a generating set.
Further, the start-up mode adjustment unit is used on the basis of original start-up mode, is shut down one by one every
One unit of a conventional power plant, being latched failure with the permanent N-1 failure of AC-DC hybrid power grid AC three-phase and direct current monopole is
Limit restrictive condition obtains the DC engineering in the case where shutting down this unit and sends power threshold outside；
Under the start-up mode for shutting down this unit, start-up mode adjustment unit calculates the tune of corresponding power plant's single unit
The calculation formula of whole impact evaluation index are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower pole is sent outside for DC engineering in this case
Limit value；PDCDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
Further, the start-up mode adjustment unit is according to the single unit output pair for shutting down each conventional power plant
Answer the adjustment impact evaluation index of each case；Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, obtain each routine
Power plant shuts down the influence ranking results that a unit runs alternating current-direct current mixed connection sending end power grid AC-DC hybrid power grid DC stabilization.
Further, the start-up mode optimization unit is each in AC-DC hybrid power grid minimum booting scheme for being arranged
The booting number of units of conventional power unit in a conventional power plant；The start-up mode optimization unit with according to the start-up mode by adjusting
Unit and stability assessment unit communication, influence ranking results and stability assessment result needed for obtaining in real time.
The invention has the benefit that technical solution of the present invention, conventional machine in a kind of AC-DC hybrid power grid is given
The minimum booting scheme of group determines method and system, the method and system by establishing simulation model prison to AC-DC hybrid power grid
The power grid security and stability under various booting schemes is controlled, it is steady in power grid security to adjust influence index confirmation according to each unit of acquisition
Minimum booting scheme under the premise of fixed, the method and system more intuitively reflect that conventional power unit booting disappears with new energy
It receives, the relationship between direct current transmission power, improves the dispatching flexibility of the outer pushing electric network of extensive new energy extra-high voltage direct-current, it is right
Operation of Electric Systems personnel have practical preferable practical directive significance and application value.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is that conventional power unit minimum booting scheme determines in a kind of AC-DC hybrid power grid of the specific embodiment of the invention
The flow chart of method；
Fig. 2 is that conventional power unit minimum booting scheme determines in a kind of AC-DC hybrid power grid of the specific embodiment of the invention
The structure chart of system.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is that conventional power unit minimum booting scheme determines in a kind of AC-DC hybrid power grid of the specific embodiment of the invention
The flow chart of method；As shown in Figure 1, shown method includes:
Step 110, BPA Power flow simulation model is established according to generating set feature each in AC-DC hybrid power grid；The hair
Motor group includes new energy unit and conventional power unit；The conventional power unit includes Hydropower Unit and fired power generating unit；
Specifically, conventional power unit minimum booting scheme provided by the present invention determines method, it is mixed to be mainly used in alternating current-direct current
Join the sending end power grid of power grid；Joined according to the feature of the composition of generating set each in AC-DC hybrid power grid, AC-DC hybrid power grid
Number builds BPA Power flow simulation model；The characteristic parameter of the AC-DC hybrid power grid include each generating set grid structure,
Generator parameter, load parameter, line parameter circuit value, transformer parameter and DC engineering parameter.
Step 120, it determines the original start-up mode of each conventional power unit in AC-DC hybrid power grid, and obtains in the original
The DC engineering of AC-DC hybrid power grid sends power outside under the start-up mode of beginning；The start-up mode includes opening for each conventional power unit
Machine quantity；
The original start-up mode of each conventional power unit can determine in the AC-DC hybrid power grid for minimum booting scheme
Preceding existing start-up mode, the start-up mode specifically include every in multiple conventional power plants (such as hydroelectric power plant, thermal power plant)
The booting quantity of one or more conventional power units in one；
Step 130, the start-up mode of each conventional power unit is adjusted one by one, calculates the alternating current-direct current mixed connection under every kind of start-up mode
The DC engineering of power grid sends power threshold outside, and exports the adjustment impact evaluation index under corresponding each way；
Specifically, on the basis of original start-up mode, a unit of each conventional power plant is shut down one by one, as one
Kind start-up mode limits item using the permanent N-1 failure of AC-DC hybrid power grid AC three-phase and direct current monopole locking failure as the limit
Part obtains the DC engineering in the case where shutting down this unit and sends power threshold outside；It is successively reciprocal, it can be obtained every kind corresponding
The corresponding adjustment photo studio evaluation index of start-up mode；
Under the start-up mode for shutting down this unit, the calculating of the adjustment impact evaluation index of corresponding power plant's single unit
Formula are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower pole is sent outside for DC engineering in this case
Limit value；PDCDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
The adjustment impact evaluation index of corresponding each case is exported according to the single unit for shutting down each conventional power plant；
Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, each conventional power plant is obtained and shuts down a single unit to alternating current-direct current mixed connection
The influence ranking results of sending end power grid AC-DC hybrid power grid DC stabilization operation.Step 140, according to adjustment impact evaluation index
Start-up mode is updated by preset rules, and is used under the start-up mode of BPA Power flow simulation model in the updated to alternating current-direct current mixed connection
Power grid N-1 security and stability is assessed, and determines minimum booting scheme.
The determining minimum booting scheme is the lowest bid for guaranteeing the AC-DC hybrid power grid DC stabilization operation
It is quasi-；
Further, start-up mode is updated by preset rules according to adjustment impact evaluation index, comprising:
Step 1411, the conventional power plant that a unit is only run under current start-up mode is switched in minimum booting scheme
Number of units is set as 1；
In these conventional power plants, the conventional power plant does not have electric power output if shutting down unit again, can exist to power grid
Additional influence, in order to guarantee operation of power networks stability, each the smallest booting number of units of conventional power plant is 1, to guarantee
There is conventional power plant that can all put into power grid, just fix the booting quantity of the conventional power plant when reaching the smallest booting number of units,
It is no longer participate in and subsequent shuts down test；
Step 1412, it is shut down in AC-DC hybrid power grid according to the influence ranking results and adjusts shadow in remaining conventional power plant
A unit in the maximum conventional power plant of evaluation index is rung, a suboptimization of generating set start-up mode is formed；
The influence sequence knot that a unit runs AC-DC hybrid power grid DC stabilization is shut down by each conventional power plant
Fruit, selecting influences maximum conventional power plant, by its unit shut down one make it is close to minimum booting scheme faster；
Step 1413, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
The security and stability assessment calculates AC-DC hybrid power grid major network stringing according to BPA Power flow simulation model emulation
Road, the permanent N-1 short trouble of main transformer three-phase, simulation calculation AC-DC hybrid power grid direct current single-stage are latched failure；
According to preset unit generator rotor angle, system voltage, system frequency stability criterion, to alternating current-direct current mixed connection electricity after failure
The Transient Stability Level of net is determined.
If assessment result passes through, return step 1411 is executed under the start-up mode for completing this suboptimization；
The assessment result passes through, then for explanation under the start-up mode for shutting down the unit, system, can still in stable state
It is determined with continuing subsequent schedule with this start-up mode for existing start-up mode, here, the machine shut down due to this suboptimization
The corresponding conventional power plant of group has a possibility that only depositing one group of unit after completing this and shutting down, thus need to step 1411 continue into
Row；
If assessment result does not pass through, number of units which is switched in minimum booting scheme is set as this suboptimization
Preceding number of units, and the conventional power plant is deleted in the influence ranking results, return step 1412 executes；
The assessment does not pass through, and illustrates that this is shut down influence of the unit to entire power grid and has had resulted in the unstable of power grid；
The unit cannot be shut down, and the booting number of units of the corresponding conventional power plant of the unit can not be shut down again, be switched on number of units
Fixed setting is the number of units before this suboptimization；
Because this suboptimization is not involved with shutting down for a certain unit, so there is no need to execute 1411 again, 1412 are directly executed；
Step 1414, after the completion of booting number of units of all conventional power plants in minimum booting scheme being respectively provided with, output is most
Small booting scheme；
After being executed by above-mentioned circulation, until obtaining final optimization booting scheme is minimum after traversing all energy plants
Booting scheme.
Further, before the start-up mode for adjusting each conventional power unit one by one, which comprises
Using BPA Power flow simulation model under original start-up mode to AC-DC hybrid power grid N-1 security and stability into
Row assessment；
The start-up mode is updated according to assessment result；
If assessment result passes through under the original start-up mode, illustrate that presence can optimize under existing start-up mode
Space, can be according to 1411~step 1414 of above-mentioned steps；
If assessment result does not pass through under the original start-up mode, then the described method includes:
Step 1421, the conventional power plant that units all under current start-up mode are all run is opened in minimum booting scheme
Board number is set as its corresponding whole unit number of units；
Step 1422, it is opened in AC-DC hybrid power grid according to the influence ranking results and adjusts shadow in remaining conventional power plant
A unit in the maximum conventional power plant of evaluation index is rung, a suboptimization of generating set start-up mode is formed；
Step 1423, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
If assessment result passes through, before number of units which is switched in minimum booting scheme is set as this suboptimization
Number of units, and the conventional power plant is deleted in the influence ranking results, return step 1422 executes；
If assessment result does not pass through, return step 1421 is executed under the start-up mode for completing this suboptimization；
Step 1424, it by after the completion of booting number of units of all conventional power plants in minimum booting scheme is respectively provided with, sieves
Except the conventional power plant that all units have all been run, the smallest power plant of single unit capacity is chosen from remaining power plant, most by it
Small booting number of units increases by one, remaining power plant's minimum booting number of units then remains unchanged, and exports the smallest of whole conventional power plants
Booting scheme.
Fig. 2 is that conventional power unit minimum booting scheme determines in a kind of AC-DC hybrid power grid of the specific embodiment of the invention
The structure chart of system.As shown in Fig. 2, the system comprises:
Building of Simulation Model unit 210, the Building of Simulation Model unit 210 are used for according to each in AC-DC hybrid power grid
Generating set feature establishes BPA Power flow simulation model；The generating set includes new energy unit and conventional power unit；It is described normal
Advising unit includes Hydropower Unit and fired power generating unit；
Further, the Building of Simulation Model unit 210 according to the composition of generating set each in AC-DC hybrid power grid,
The characteristic parameter of AC-DC hybrid power grid builds BPA Power flow simulation model；The characteristic parameter of the AC-DC hybrid power grid includes
Grid structure, generator parameter, load parameter, line parameter circuit value, transformer parameter and the DC engineering ginseng of each generating set
Number.
Start-up mode adjustment unit 220, the start-up mode adjustment unit 220 determine each routine in AC-DC hybrid power grid
The original start-up mode of unit, and obtain the DC engineering of AC-DC hybrid power grid under the original start-up mode and send outside
Power；The start-up mode includes the booting quantity in each conventional power unit；
The start-up mode adjustment unit 220 adjusts the start-up mode of each conventional power unit one by one, calculates every kind of booting side
The DC engineering of AC-DC hybrid power grid under formula sends power threshold outside, and the adjustment for exporting corresponding power plant's single unit influences
Evaluation index；
Further, the start-up mode adjustment unit 220 is used on the basis of original start-up mode, is shut down one by one
One unit of each conventional power plant is latched failure with the permanent N-1 failure of AC-DC hybrid power grid AC three-phase and direct current monopole
For limit restrictive condition, obtains the DC engineering in the case where shutting down this unit and send power threshold outside；
Under the start-up mode for shutting down this unit, start-up mode adjustment unit 220 calculates corresponding power plant's single unit
Adjustment impact evaluation index calculation formula are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower pole is sent outside for DC engineering in this case
Limit value；PDCDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
Further, the start-up mode adjustment unit 220 is defeated according to the single unit for shutting down each conventional power plant
The adjustment impact evaluation index of each case is corresponded to out；Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, are obtained each
Conventional power plant shuts down a unit and sorts to the influence that alternating current-direct current mixed connection sending end power grid AC-DC hybrid power grid DC stabilization is run
As a result.
Start-up mode optimizes unit 230, updates start-up mode by preset rules according to adjustment impact evaluation index, determines most
Small booting scheme；
Further, the start-up mode optimization unit 230 is for being arranged in AC-DC hybrid power grid minimum booting scheme
The booting number of units of conventional power unit in each conventional power plant；Start-up mode optimization unit 230 by with according to the booting
Mode adjustment unit 220 and stability assessment unit communication, influence ranking results and stability needed for obtaining in real time are commented
Estimate result.
Stability assessment unit 240, the stability assessment unit 240 using Building of Simulation Model unit 210 for being built
Vertical BPA Power flow simulation model assesses AC-DC hybrid power grid N-1 security and stability.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the disclosure
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.The step of being related in this specification, which numbers, is only used for distinguishing each step, and the time being not limited between each step
Or the relationship of logic, restriction unless the context clearly, otherwise the relationship between each step includes the case where various possible.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means to be in the disclosure
Within the scope of and form different embodiments.For example, embodiment claimed in detail in the claims is one of any
Can in any combination mode come using.
The various component embodiments of the disclosure can be implemented in hardware, or to run on one or more processors
Software module realize, or be implemented in a combination thereof.The disclosure is also implemented as executing side as described herein
The some or all equipment or system program (for example, computer program and computer program product) of method.It is such
It realizes that the program of the disclosure can store on a computer-readable medium, or can have the shape of one or more signal
Formula.Such signal can be downloaded from an internet website to obtain, and perhaps be provided on the carrier signal or with any other shape
Formula provides.
The disclosure is limited it should be noted that above-described embodiment illustrates rather than the disclosure, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.Word "comprising" is not arranged
Except there are element or steps not listed in the claims.Word "a" or "an" located in front of the element does not exclude the presence of more
A such element.The disclosure can be by means of including the hardware of several different elements and by means of properly programmed calculating
Machine is realized.If several in these systems can be by same in the unit claim for listing dry systems
Hardware branch embodies.
The above is only the specific embodiment of the disclosure, it is noted that for the ordinary skill people of this field
Member for, do not depart from the disclosure spirit under the premise of, can make several improvements, modify and deform, these improve, modification,
It is regarded as falling within the scope of protection of this application with deformation.
Claims (13)
1. conventional power unit minimum booting scheme determines method in a kind of AC-DC hybrid power grid, which comprises
BPA Power flow simulation model is established according to generating set feature each in AC-DC hybrid power grid；The generating set includes new
Energy unit and conventional power unit；The conventional power unit includes Hydropower Unit and fired power generating unit；
It determines the original start-up mode of each conventional power unit in AC-DC hybrid power grid, and obtains in the original start-up mode
The DC engineering of lower AC-DC hybrid power grid sends power outside；The start-up mode includes the booting quantity of each conventional power unit；
The start-up mode of each conventional power unit is adjusted one by one, calculates the direct current work of the AC-DC hybrid power grid under every kind of start-up mode
Journey sends power threshold outside, and exports the adjustment impact evaluation index under corresponding each way；
Start-up mode is updated by preset rules according to adjustment impact evaluation index, and in the updated using BPA Power flow simulation model
Start-up mode under AC-DC hybrid power grid N-1 security and stability is assessed, determine minimum booting scheme.
2. according to the method described in claim 1, it is characterized by: according to the group of generating set each in AC-DC hybrid power grid
BPA Power flow simulation model is built at the characteristic parameter of, AC-DC hybrid power grid；The characteristic parameter packet of the AC-DC hybrid power grid
Include grid structure, generator parameter, load parameter, line parameter circuit value, transformer parameter and the DC engineering of each generating set
Parameter.
3. the method according to claim 1, wherein the start-up mode for adjusting each conventional power unit one by one, meter
The DC engineering for calculating the AC-DC hybrid power grid under every kind of start-up mode sends power outside, and exports the adjustment shadow under each way
Ring evaluation index, comprising:
On the basis of original start-up mode, a unit of each conventional power plant is shut down, one by one with AC-DC hybrid power grid
The permanent N-1 failure of AC three-phase and direct current monopole locking failure are limit restrictive condition, in the case that this unit is shut down in acquisition
DC engineering send power threshold outside；
Under the start-up mode for shutting down this unit, the calculation formula of the adjustment impact evaluation index of corresponding power plant's single unit
Are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower limit is sent outside for DC engineering in this case
Value；PDCDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
4. according to the method described in claim 3, it is characterized by: according to the adjustment shadow of the single unit of each conventional power plant
Ring evaluation index；Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, it is straight to handing over to obtain each conventional power plant single unit
Flow the influence ranking results of serial-parallel power grid DC stabilization operation.
5. according to the method described in claim 4, it is characterized in that, described press preset rules more according to adjustment impact evaluation index
New start-up mode, comprising:
Step 1, the number of units that the conventional power plant that a unit is only run under current start-up mode is switched in minimum booting scheme is set
It is set to 1；
Step 2, it is shut down in AC-DC hybrid power grid according to the influence ranking results and adjusts impact evaluation in remaining conventional power plant
A unit in the maximum conventional power plant of index forms a suboptimization of generating set start-up mode；
Step 3, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
If assessment result passes through, return step 1 is executed under the start-up mode for completing this suboptimization；
If assessment result does not pass through, before number of units which is switched in minimum booting scheme is set as this suboptimization
Number of units, and the conventional power plant is deleted in the influence ranking results, return step 2 executes；
Step 4, after the completion of booting number of units of all conventional power plants in minimum booting scheme being respectively provided with, the smallest booting is exported
Scheme.
6. according to the method described in claim 4, it is characterized in that, before the start-up mode for adjusting each conventional power unit one by one, institute
The method of stating includes:
AC-DC hybrid power grid N-1 security and stability is commented under original start-up mode using BPA Power flow simulation model
Estimate；
The start-up mode is updated according to assessment result.
7. according to the method described in claim 6, it is characterized in that, using BPA Power flow simulation model in original start-up mode
Under result that AC-DC hybrid power grid N-1 security and stability is assessed be obstructed out-of-date, which comprises
Step 1, the conventional power plant that units all under current start-up mode are all run is switched on number of units in minimum booting scheme
It is set as its corresponding whole unit number of units；
Step 2, it is opened in AC-DC hybrid power grid according to the influence ranking results and adjusts impact evaluation in remaining conventional power plant
A unit in the maximum conventional power plant of index forms a suboptimization of generating set start-up mode；
Step 3, the AC-DC hybrid power grid N-1 security and stability after optimization is assessed；
If assessment result passes through, number of units which is switched in minimum booting scheme be set as this suboptimization before platform
Number, and the conventional power plant is deleted in the influence ranking results, return step 2 executes；
If assessment result does not pass through, return step 1 is executed under the start-up mode for completing this suboptimization；
Step 4, after the completion of each conventional power plant minimum booting number of units is respectively provided with, the conventional electricity that all units have all been run is screened out
Factory chooses the smallest power plant of single unit capacity from remaining power plant, its minimum booting number of units is increased by one, remaining power plant is most
Small booting number of units then remains unchanged, and exports the minimum booting scheme of whole conventional power plants.
8. according to the method described in claim 1, it is characterized by: it is described to AC-DC hybrid power grid N-1 security and stability into
Row assessment, comprising:
The permanent N-1 short circuit event of AC-DC hybrid power grid main grid structure route, main transformer three-phase is calculated according to BPA Power flow simulation model emulation
Barrier, simulation calculation AC-DC hybrid power grid direct current single-stage are latched failure；
According to preset unit generator rotor angle, system voltage, system frequency stability criterion, to AC-DC hybrid power grid after failure
Transient Stability Level is determined.
9. conventional power unit minimum booting scheme determines system in a kind of AC-DC hybrid power grid, the system comprises:
Building of Simulation Model unit, the Building of Simulation Model unit are used for special according to generating set each in AC-DC hybrid power grid
Sign establishes BPA Power flow simulation model；The generating set includes new energy unit and conventional power unit；The conventional power unit includes
Hydropower Unit and fired power generating unit；
Start-up mode adjustment unit, the start-up mode adjustment unit determine the original of each conventional power unit in AC-DC hybrid power grid
Start-up mode, and obtain under the original start-up mode DC engineering of AC-DC hybrid power grid send power outside；It is described
Start-up mode includes the booting quantity of each conventional power unit；
The start-up mode adjustment unit adjusts the start-up mode of each conventional power unit one by one, calculates the friendship under every kind of start-up mode
The DC engineering of direct current serial-parallel power grid sends power threshold outside, and the adjustment impact evaluation for exporting corresponding power plant's single unit refers to
Mark；
Start-up mode optimizes unit, updates start-up mode by preset rules according to adjustment impact evaluation index, determines minimum booting
Scheme；
Stability assessment unit, the BPA trend that the stability assessment unit is used to establish using Building of Simulation Model unit are imitative
True mode assesses AC-DC hybrid power grid N-1 security and stability.
10. according to the method described in claim 9, it is characterized by: the Building of Simulation Model unit is according to alternating current-direct current mixed connection
The composition of each generating set, the characteristic parameter of AC-DC hybrid power grid build BPA Power flow simulation model in power grid；The alternating current-direct current
The characteristic parameter of serial-parallel power grid includes the grid structure of each generating set, generator parameter, load parameter, line parameter circuit value, change
Depressor parameter and DC engineering parameter.
11. according to the method described in claim 9, it is characterized by: the start-up mode adjustment unit in original for opening
On the basis of machine mode, a unit of each conventional power plant is shut down, one by one with the permanent N-1 of AC-DC hybrid power grid AC three-phase
Failure and direct current monopole locking failure are limit restrictive condition, obtain the DC engineering in the case where shutting down this unit and send function outside
Rate limiting value；
Under the start-up mode for shutting down this unit, start-up mode adjustment unit calculates the adjustment shadow of corresponding power plant's single unit
Ring the calculation formula of evaluation index are as follows:
Wherein, IDCiFor adjustment impact evaluation index in this case；PiPower limit is sent outside for DC engineering in this case
Value；PDcDC engineering for AC-DC hybrid power grid under original start-up mode sends power outside.
12. according to the method for claim 11, it is characterised in that: the start-up mode adjustment unit is according to each routine
The adjustment impact evaluation index of the single unit of power plant；Multiple adjustment impact evaluation indexs are subjected to positive sequence sequence, are obtained each
Conventional power plant shuts down the influence ranking results that a unit runs AC-DC hybrid power grid DC stabilization.
13. according to the method for claim 12, it is characterised in that: the start-up mode optimization unit is for being arranged alternating current-direct current
In serial-parallel power grid minimum booting scheme in each conventional power plant conventional power unit booting number of units；The start-up mode optimizes unit
By the way that with according to the start-up mode adjustment unit and stability assessment unit communication, the influence sequence needed for obtaining in real time is tied
Fruit and stability assessment result.
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