CN106058876B - Consider the dynamic reactive Site Selection analysis method and system of Enhancement of Transient Voltage Stability - Google Patents
Consider the dynamic reactive Site Selection analysis method and system of Enhancement of Transient Voltage Stability Download PDFInfo
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Abstract
The invention discloses a kind of dynamic reactive Site Selection analysis method and system considering Enhancement of Transient Voltage Stability, the method obtains the related data of power grid first；Then simulation analysis is carried out to the Enhancement of Transient Voltage Stability of power grid, carries out analyzing determining transient voltage unstability failure collection by electric network fault, and be divided into several Transient Voltage Stability weakness zones；The dynamic passive compensation sensitivity under each malfunction is calculated again, and determines using Site Selection combined analytical method number and the position of the node to be compensated of one of electric network fault weakness zone；The dynamic reactive Site Selection for finally exporting all Transient Voltage Stability weakness zones waits for dot position scheme.Compared with prior art, in dynamic reactive Site Selection problem of the present invention suitable for AC-DC hybrid power grid, have many advantages, such as high-efficient simple, combine closely with engineering, and the redundancy of dynamic reactive Site Selection compensation point to be selected can be effectively prevent.
Description
Technical field
The present invention relates to a kind of reactive-load compensation site selecting methods, and in particular to a kind of dynamic nothing considering Enhancement of Transient Voltage Stability
Work(Site Selection analysis method and system belong to power system reactive power compensation technical field.
Background technology
The direct current transportation in China already has certain scale, extra-high-voltage alternating current also in greatly developing and building successively,
The a plurality of extra-high-voltage alternating current engineering that put into operation (such as southeast Shanxi-Nanyang-Jingmen, Huainan-Hu Xi extra-high-voltage alternating current works are built up
Journey), the regions such as China East China, south China rack is complex, and load growth ratio is very fast, and has a plurality of extra-high voltage to access, with
The development for the following power grid has larger challenge to the Enhancement of Transient Voltage Stability in such load center region.It is handed over directly to enhance
The Enhancement of Transient Voltage Stability in series-parallel connection area is flowed, the dynamic of Enhancement of Transient Voltage Stability can be accounted in Transient Voltage Stability weakness zone
Planning that state is idle determines number of nodes to be compensated and the position of weakness zone, dynamic after grid collapses to improve system
The enabling capabilities that state is idle.
During dynamic reactive Site Selection for improving power system transient stability is analyzed, core is to propose reflection power grid event
The Transient Voltage Stability index of recovery capability after barrier, and establish the dynamic reactive Site Selection point for considering Enhancement of Transient Voltage Stability
Analysis method.It is more to the research of Network Voltage Stability at present, wherein it is more mature to the research of static electric voltage stability, often
Static voltage stability index mainly has the methods of PV curve methods, sensitivity index, modal idenlification method.But only rely on Static Electro
Pressure stability carries out research to the voltage stabilization weakness zone of power grid certain limitation, also proposed in current research several temporary
State voltage stability index, wherein Voltage Drop index can reflect the transient recovery ability of power grid after failure, when maximum fault clearance
Between index can assess the maximum duration that operation of power networks is under failure, these indexs are by topological structure of electric and the shadow of control system
Sound is larger, has certain limitation.In addition, energy function method can be used to assess the voltage stability of power grid after a failure, but
Since this method construction energy function method is relatively difficult, energy function method also needs in the assessment of Enhancement of Transient Voltage Stability
More researchs.In order to accurately reflect the recovery capability after grid collapses more comprehensively, propose that novel transient voltage is steady
Determine index to have great importance.
Invention content
In order to overcome the shortcomings of the above technology, technical problem to be solved by the present invention lies in provide a kind of consideration transient state
The dynamic reactive Site Selection analysis method and system of voltage stability.
The technical scheme adopted by the invention to solve the technical problem is that：Consider the dynamic reactive rule of Enhancement of Transient Voltage Stability
Draw siting analysis method, characterized in that include the following steps：
Step 1：The related data of power grid is obtained, the related data of power grid includes DC transmission system, dynamic passive compensation
The transient state parameter and its control system parameter of device and generator；
Step 2：Simulation analysis is carried out to the Enhancement of Transient Voltage Stability of power grid, carries out analyzing determining transient state by electric network fault
Voltage Instability failure collection, is denoted asAnd according toDistribution the power grid to break down is divided into several transient voltages
Stablize weakness zone；
Step 3：The failure of Transient Voltage Stability weakness zone is analyzed one by one, and is calculated under each malfunction
Dynamic passive compensation sensitivity determines the to be compensated of one of electric network fault weakness zone using Site Selection combined analytical method
The number of point and position need 2 even more compensation point combinations pair if 1 compensation point cannot be satisfied steady demand
Weakness zone carries out reactive-load compensation；
Step 4：Whether the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones is finished, if it is
The dynamic reactive Site Selection for then exporting all Transient Voltage Stability weakness zones waits for dot position scheme, otherwise goes to step 3
Continue the Site Selection analysis to next weakness zone, until the dynamic reactive to all Transient Voltage Stability weakness zones is planned
Until siting analysis finishes.
The failure collection includes generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and circuit event
Barrier.
The dynamic passive compensation sensitivity includes restoring the compensation sensitivity of index TVRI based on transient voltageWith
Compensation sensitivity based on transient voltage fluctuation index TVFI
The compensation sensitivityCalculating process include the following steps：
(11) transient voltage recovery index TVRI is defined as：
In formula：Ut,iFor in the transient voltage of t moment node i；Ui0For the voltage under node i nominal situation；tcIt is extensive for transient state
Deadline during multiple；FkFor the fault type of power grid；Wherein, For failure collection；
(12) failure collectionIt is expressed as：
In formula：RG, RUHV, RHVDC, RBRGenerator failure set, extra-high-voltage alternating current failure collection, direct current transportation are indicated respectively
Failure collection and line fault set；
(13) it is its difference definition by the TVRI index expressions of formula (1)：
In formula：tsMaterial calculation in being analyzed for time-domain-simulation；
(14) it usesArbitrary node in power grid is calculated, can show that global transient voltage restores index and is：
By formula (4) it is found that global transient voltage restores indexBy all nodes in assessment areaMost
Big value determines；
Compensation sensitivity table based on TVRI indexs is shown as：
It converts formula (7) to：
In formula：TVRIsIt can be solved by formula (4), QSVCFor reactive compensation capacity.
The compensation sensitivityCalculating process include the following steps：
(21) transient voltage fluctuation index TVFI is defined as：
In formula：NTFor the cycle of transient state time-domain-simulation；NpFor pth after electric network faultthSecondary cycle；Point
It Wei not FkFailure lower node i is in NpThe minimum and maximum voltage of cycle；
(22) it usesArbitrary node in power grid is calculated, can show that transient voltage fluctuation index is：
(23) the compensation sensitivity table based on TVFI indexs is shown as：
Formula (9) is reduced to：
In formula：TVFIsIt can be solved by formula (6), QSVCFor reactive compensation capacity.
The Site Selection combined analytical method includes the following steps：
(1) Enhancement of Transient Voltage Stability of the whole network is emulated and is analyzed using time-domain simulation program, and is temporary according to existing
The failure collection of state voltage stabilization sex chromosome mosaicism is divided into several weakness zones；
(2) it is directed to each Transient Voltage Stability weakness zone, one or more points to be selected may be selected and compensate, planning choosing
The principle of location is that the Enhancement of Transient Voltage Stability of system is improved using minimum compensation point；
(3) to the failure collection in each region of Transient Voltage Stability weakness zone based on the compensation sensitivity by
It is a to be calculated and analyzed, if 1 dynamic reactive compensation device cannot solve the problems, such as Enhancement of Transient Voltage Stability, need with 2
Even more dynamic reactive compensation devices of platform compensate；
(4) the addressing position of each weakness zone is calculated and is screened based on dynamic passive compensation sensitivity, finally
Show that the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones waits for dot position scheme, to improve the transient state of the whole network
Voltage stability.
The related data of the power grid directly acquires from network system or by input unit typing.
The present invention also provides a kind of dynamic reactive Site Selection analysis system considering Enhancement of Transient Voltage Stability, features
It is, including：
Data acquisition module, to obtain the related data of power grid, the related data of power grid includes DC transmission system, moves
The transient state parameter and its control system parameter of state reactive power compensator and generator；
Simulation analysis module is carried out to carry out simulation analysis to the Enhancement of Transient Voltage Stability of power grid by electric network fault
Analysis determines transient voltage unstability failure collection, is denoted as
Region division module, to basisDistribution the power grid to break down will be divided into several transient voltages
Stablize weakness zone；
Siting analysis module is analyzed one by one to the failure to Transient Voltage Stability weakness zone, and is calculated each
Dynamic passive compensation sensitivity under malfunction determines that one of electric network fault is weak using Site Selection combined analytical method
The number of the node to be compensated in region and position, if 1 compensation point cannot be satisfied steady demand, need 2 it is even more
Compensation point combination carries out reactive-load compensation to weakness zone；
Output module, the dynamic reactive Site Selection to export all Transient Voltage Stability weakness zones wait for dot position
Scheme.
The failure collection includes generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and circuit event
Barrier.
The siting analysis module includes dynamic passive compensation Calculation of Sensitivity module and Site Selection combinatory analysis module.
The dynamic passive compensation Calculation of Sensitivity module restores the compensation of index TVRI to calculate based on transient voltage
SensitivityWith the compensation sensitivity based on transient voltage fluctuation index TVFI
The compensation sensitivityCalculating process include the following steps：
(11) transient voltage recovery index TVRI is defined as：
In formula：Ut,iFor in the transient voltage of t moment node i；Ui0For the voltage under node i nominal situation；tcIt is extensive for transient state
Deadline during multiple；FkFor the fault type of power grid；Wherein, For failure collection；
(12) failure collectionIt is expressed as：
In formula：RG, RUHV, RHVDC, RBRGenerator failure set, extra-high-voltage alternating current failure collection, direct current transportation are indicated respectively
Failure collection and line fault set；
(13) it is its difference definition by the TVRI index expressions of formula (1)：
In formula：tsMaterial calculation in being analyzed for time-domain-simulation；
(14) it usesArbitrary node in power grid is calculated, can show that global transient voltage restores index and is：
By formula (4) it is found that global transient voltage restores indexBy all nodes in assessment areaMost
Big value determines；
Compensation sensitivity table based on TVRI indexs is shown as：
It converts formula (7) to：
In formula：TVRIsIt can be solved by formula (4), QSVCFor reactive compensation capacity；
The compensation sensitivityCalculating process include the following steps：
(21) transient voltage fluctuation index TVFI is defined as：
In formula：NTFor the cycle of transient state time-domain-simulation；NpFor pth after electric network faultthSecondary cycle；Point
It Wei not FkFailure lower node i is in NpThe minimum and maximum voltage of cycle；
(22) it usesArbitrary node in power grid is calculated, can show that transient voltage fluctuation index is：
(23) the compensation sensitivity table based on TVFI indexs is shown as：
Formula (9) is reduced to：
In formula：TVFIsIt can be solved by formula (6), QSVCFor reactive compensation capacity.
The Site Selection combinatory analysis module first with time-domain simulation program to the Enhancement of Transient Voltage Stability of the whole network into
Row emulation and analysis, and according to there are problems that the failure collection of Enhancement of Transient Voltage Stability is divided into several weakness zones；For
Each Transient Voltage Stability weakness zone may be selected one or more points to be selected and compensate, and the principle of Site Selection is to utilize
Minimum compensation point improves the Enhancement of Transient Voltage Stability of system；To the fault set in each region of Transient Voltage Stability weakness zone
Conjunction is calculated and is analyzed one by one based on the compensation sensitivity, if 1 dynamic reactive compensation device cannot solve transient state electricity
The problem of pressing stability, then need to be compensated with 2 even more dynamic reactive compensation devices；It is mended based on dynamic reactive
It repays sensitivity the addressing position of each weakness zone is calculated and screened, finally obtains all Transient Voltage Stability weak areas
The dynamic reactive Site Selection in domain waits for dot position scheme, to improve the Enhancement of Transient Voltage Stability of the whole network.
The data acquisition module directly acquires the related data of power grid from network system or by input unit typing
The related data of power grid.
The beneficial effects of the invention are as follows：The present invention is divided into several temporarily according to the distribution of transient voltage unstability failure collection
State voltage stabilization weakness zone is solved in advance by regarding reactive-load compensation Site Selection as a subproblem, right to a certain extent
Dynamic reactive planning problem is simplified；Transient Voltage Stability assessment of the TVRI and TVFI indexs of proposition for after failure is suitable
It is stronger with property, the dynamic passive compensation sensitivity under failureOrCalculate more simple, the dynamic passive compensation of foundation
Site Selection combined analysis method is highly practical, and compared with prior art, the present invention is dynamic suitable for AC-DC hybrid power grid
In Site Selection problem that state is idle, have many advantages, such as high-efficient simple, combine closely with engineering, and dynamic reactive can be effectively prevent
The redundancy of Site Selection compensation point to be selected.
The present invention can solve to consider the nearest compensation position of the idle planning problem of Enhancement of Transient Voltage Stability, imitative using time domain
The transient voltage unstability region of true software analysis system, and using idle Site Selection combined method to the optimal compensation point quantity and position
It sets and is analyzed, by can be used problem summary most weakness zone using Site Selection combined analytical method each region
Few compensation point position can prevent the redundancy of dynamic reactive Site Selection, and can efficiently enhance the Transient Voltage Stability of system
Property.
In order to analyze dynamic reactive Site Selection, the present invention proposes voltage after capable of reflecting electric network fault and restores
The Transient Voltage Stability index of ability：Transient voltage restores index TVRI and transient voltage fluctuates index TVFI, is come to electricity with this
Transient voltage departure degree and transient swing degree are assessed after net failure.Present invention is alternatively directed to Transient Voltage Stability weaknesses
Region gives a kind of Simple Calculation Method based on the compensation sensitivity under TVRI indexs and TVFI indexs.
Description of the drawings
Fig. 1 is the structural schematic diagram of site selection system of the present invention；
Fig. 2 is the method flow diagram of siting analysis method of the present invention；
Fig. 3 is transient voltage curve after power grid large disturbances；
Fig. 4 is the schematic diagram that dynamic reactive compensation device combines addressing method；
Fig. 5 is the schematic diagram of the extension alternating current-direct current combined hybrid system based on IEEE39.
Specific implementation mode
In order to clarify the technical characteristics of the invention, below by specific implementation mode, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used for realizing the different knots of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
For the weakness zone of transient voltage unstability risk present in power grid, dynamic reactive planning can be used as a kind of strick precaution
Measure.Firstly the need of Site Selection position is determined in dynamic reactive planning, two kinds common are to dynamic reactive Site Selection
Mode is determined, and one kind to establish suitable Transient Voltage Stability index select preferred plan compensation point, separately
Outer one kind is to establish dynamic reactive plan optimization model, by Site Selection position and the conduct of dynamic passive compensation capacity in model
Optimized variable carries out optimizing.It is relatively simple by way of optimizing optimizing to Site Selection position, but it is used for practical bulk power grid
In will increase optimized variable so that control dimension obviously increase, therefore, based on Transient Voltage Stability index propose
Excellent dynamic reactive Site Selection analysis method can decompose Site Selection problem and constant volume problem, right to a certain extent
Dynamic reactive planning problem is simplified.Therefore, the dynamic reactive Site Selection analysis for considering Enhancement of Transient Voltage Stability is established
Method is conducive to the decomposition to dynamic reactive planing method and simplification, and can efficiently enhance the Enhancement of Transient Voltage Stability of system.
As shown in Figure 1, a kind of dynamic reactive Site Selection analysis system of consideration Enhancement of Transient Voltage Stability of the present invention,
It includes：
Data acquisition module directly acquires the related data of power grid or by input unit typing power grid from network system
Related data, the related data of power grid includes the transient state parameter of DC transmission system, dynamic reactive compensation device and generator
And its control system parameter, it can therefrom obtain generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and line
Road fault message；
Simulation analysis module, simulation analysis module are equipped with time-domain-simulation analysis software, to the transient voltage to power grid
Stability carries out simulation analysis, carries out analyzing determining transient voltage unstability failure collection by electric network fault, be denoted asIt is described
Failure collectionIncluding generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and line fault；
Region division module, to basisDistribution the power grid to break down will be divided into several transient voltages
Stablize weakness zone；
Siting analysis module is analyzed one by one to the failure to Transient Voltage Stability weakness zone, and is calculated each
Dynamic passive compensation sensitivity under malfunction determines that one of electric network fault is weak using Site Selection combined analytical method
The number of the node to be compensated in region and position, if 1 compensation point cannot be satisfied steady demand, need 2 it is even more
Compensation point combination carries out reactive-load compensation to weakness zone；
Output module, the dynamic reactive Site Selection to export all Transient Voltage Stability weakness zones wait for dot position
Scheme.
The siting analysis module includes dynamic passive compensation Calculation of Sensitivity module and Site Selection combinatory analysis module；
The dynamic passive compensation Calculation of Sensitivity module restores the compensation sensitivity of index TVRI to calculate based on transient voltageWith the compensation sensitivity based on transient voltage fluctuation index TVFIThe Site Selection combinatory analysis module is first
The Enhancement of Transient Voltage Stability of the whole network is emulated and analyzed using time-domain simulation program, and according to there are Enhancement of Transient Voltage Stability
The failure collection of problem is divided into several weakness zones；For each Transient Voltage Stability weakness zone, may be selected one or
Multiple points to be selected compensate, and the principle of Site Selection is that the Enhancement of Transient Voltage Stability of system is improved using minimum compensation point；
The failure collection in each region of Transient Voltage Stability weakness zone is carried out based on the compensation sensitivity one by one calculate and
Analysis, if 1 dynamic reactive compensation device cannot solve the problems, such as Enhancement of Transient Voltage Stability, needs with 2 even more
Dynamic reactive compensation device compensates；The addressing position of each weakness zone is counted based on dynamic passive compensation sensitivity
It calculates and screens, finally show that the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones waits for dot position scheme, with
Improve the Enhancement of Transient Voltage Stability of the whole network.
As shown in Fig. 2, a kind of dynamic reactive Site Selection analysis method of consideration Enhancement of Transient Voltage Stability of the present invention, it should
The system structure diagram that siting analysis method is depended on is as shown in Figure 1, give dynamic passive compensation equipment locating method
Analysis and screening scheme.
Siting analysis method of the present invention can solve to consider the nearest of the idle planning problem of Enhancement of Transient Voltage Stability
Position is compensated, using the transient voltage unstability region of time-domain-simulation software analysis system, and uses idle Site Selection combined method
The optimal compensation point quantity and position are analyzed, the addressing detailed process of dynamic reactive planning is as shown in Figure 2.
Siting analysis method of the present invention can be assisted using time-domain-simulation analysis software, be mainly comprised the following steps：
Step 1：The related data of power grid is obtained, the related data of power grid includes DC transmission system, dynamic passive compensation
The transient state parameter and its control system parameter of device and generator；
Step 2：Simulation analysis is carried out to the Enhancement of Transient Voltage Stability of power grid, passes through generator failure, extra-high-voltage alternating current event
The electric network faults such as barrier, extra-high voltage direct-current transmission failure and line fault carry out analyzing determining transient voltage unstability failure collection, remember
ForAnd according toDistribution the power grid to break down is divided into several Transient Voltage Stability weakness zones；
Step 3：The failure of Transient Voltage Stability weakness zone is analyzed one by one, and is calculated under each malfunction
Dynamic passive compensation sensitivity (WithCan be based on formula (8) or (10) are calculated), utilize Site Selection combinatory analysis
Method determines number and the position of the node to be compensated of one of electric network fault weakness zone, if 1 compensation point cannot be satisfied surely
Determine demand, then 2 even more compensation point combinations is needed to carry out reactive-load compensation to weakness zone；
Step 4：Whether the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones is finished, if it is
The dynamic reactive Site Selection for then exporting all Transient Voltage Stability weakness zones waits for dot position scheme, otherwise goes to step 3
Continue the Site Selection analysis to next weakness zone, until the dynamic reactive to all Transient Voltage Stability weakness zones is planned
Until siting analysis finishes.
Siting analysis method of the present invention to each region using Site Selection combined analytical method can by problem summary,
To the minimum compensation point position of weakness zone, the redundancy of dynamic reactive Site Selection can be prevented.
The transient voltage response schematic diagram of power grid after a failure is as shown in Figure 3, wherein UNFor rated voltage；tFFor power grid event
Hinder time of origin；tclFor electric network fault checkout time；tcFor the deadline calculated for Transient Voltage Stability index.After failure
The region that Voltage Instability can be caused to occur can be improved by installing dynamic reactive compensation device.
In order to analyze dynamic passive compensation facility planning addressing, need after proposing to reflect electric network fault first
The Transient Voltage Stability index of voltage recovery capability, it is proposed to this end that transient voltage restores index TVRI (Transient
Voltage recovery index, TVRI) and transient voltage fluctuation index TVFI (transient voltage
Fluctuation index, TVFI), transient voltage departure degree after electric network fault and transient swing degree are assessed.
The transient voltage restores index TVRI, and definition is：
In formula：Ut,iFor in the transient voltage of t moment node i；Ui0For the voltage under node i nominal situation；tcIt is extensive for transient state
Deadline during multiple；FkFor the fault type of power grid；Wherein, For failure collection.
Wherein, failure collectionIncluding generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure, circuit
Failure etc., is represented by：
In formula：RG, RUHV, RHVDC, RBRGenerator failure set, extra-high-voltage alternating current failure collection, direct current transportation are indicated respectively
Failure collection and line fault set.
Transient voltage restore index can be used for assess electric network fault after transient voltage deviate nominal situation under degree, with weighing apparatus
Measure the transient voltage recovery capability after failure.For the ease of being restored to the transient voltage after failure using time-domain-simulation analysis program
Index calculates, and is its difference definition by the TVRI index expressions of formula (1)：
In formula：tsMaterial calculation in being analyzed for time-domain-simulation.
Node i failure collection can be weighedUnder transient voltage recovery extent,Can to arbitrary node into
Row calculates, and in order to assess the transient voltage recovery capability under some region or the whole network, it is extensive to give global transient voltage
Multiple index, is defined as：
Global transient voltage restores indexBy all nodes in assessment areaMaximum value determines.When
When TVRI indexs are larger, then show that faulty grids do not have the ability restored automatically, which causes after grid collapses
The hidden danger of spread of voltage is bigger, which is transient stability weak node, needs by taking certain indemnifying measure to give
To prevent trouble before it happens.Transient voltage recovery situation after failure is related to the control system of grid structure and dynamic regulation element.
The transient voltage fluctuates index TVFI definitions：
In formula：NTFor the cycle of transient state time-domain-simulation；NpFor pth after electric network faultthSecondary cycle；Point
It Wei not FkFailure lower node i is in NpThe minimum and maximum voltage of cycle.
It is also possible to define general indices of the TVFI under the whole network and be：
TVFI indexs can averagely fluctuate the voltage recovery capability for weighing power grid by the voltage transient after failure.
The dynamic reactive Site Selection analysis method can be calculated and be screened by compensating sensitivity, for transient state
Voltage stabilization weakness zone gives the Simple Calculation Method based on the compensation sensitivity under TVRI indexs and TVFI indexs.
The compensation sensitivity based on TVRI indexs is represented by：
It, can be by formula in order to utilize transient emulation analysis software and calculate the node to be selected of dynamic reactive compensation device
(7) it is converted into：
In formula：TVRIsIt can be solved by formula (4).
The compensation sensitivity based on TVFI indexs is represented by：
Equally, it analyzes and calculates for the ease of transient emulation, formula (9) can be reduced to：
In formula：TVFIsIt can be solved by formula (6).
The nearest compensation point problem of dynamic reactive Site Selection for considering Enhancement of Transient Voltage Stability, to Transient Voltage Stability weakness
Region can plan that combination siting analysis method is identified by dynamic reactive.
Dynamic reactive Site Selection combined analytical method can solve the problems, such as that addressing waits for the number and optimal combination of reconnaissance, it is intended to
It prevents from excessively investing the compensation node in Site Selection.Since actual area Net Frame of Electric Network is complex, busbar is numerous, in order to
Enable the dynamic reactive Site Selection analysis method more quickly, it is convenient and be efficiently applied to actual electric network, it is first
The Enhancement of Transient Voltage Stability of the whole network can first be emulated and be analyzed using time-domain simulation program, according to there are Transient Voltage Stabilities
The failure collection of sex chromosome mosaicism is divided into several weakness zones, for each Transient Voltage Stability weakness zone, may be selected one
Or multiple points to be selected compensate, the principle of Site Selection is that the Transient Voltage Stability of system is improved using minimum compensation point
Property.Dynamic reactive Site Selection combined analytical method as shown in figure 4, each region to Transient Voltage Stability weakness zone failure
Set is calculated and is analyzed one by one based on the compensation sensitivity, if 1 dynamic reactive compensation device cannot solve transient state
The problem of voltage stability, then needs to be compensated with 2 even more dynamic reactive compensation devices.Dynamic reactive planning choosing
The method of location is based on dynamic passive compensation sensitivity analysis and screening, and the addressing position of each weakness zone is calculated and sieved
Choosing, the final Enhancement of Transient Voltage Stability for improving the whole network.
The present invention is verified with reference to a concrete application embodiment.
For the embodiment uses the extension alternating current-direct current combined hybrid system based on IEEE39 standard examples, the expansion based on IEEE39
The structure chart of alternating current-direct current combined hybrid system is opened up as shown in figure 5, sharing 3 direct current transportation accesses in system, wherein rectification side access point
Respectively node 2,10 and 12, inverter side access point is respectively node 8,17 and 26, and DC transmission system uses constant current
Determine gamma kick pattern, rectification side initial DC transmission current is 1.0p.u., and the blow-out angle of inverter side is 8.0 °.Pass through
The dynamic reactive Site Selection analysis method of the considerations of IEEE39 standard examples are to proposing Enhancement of Transient Voltage Stability carry out verification and
Analysis.
The Enhancement of Transient Voltage Stability of the expansion system is analyzed based on time-domain-simulation analysis program, wherein power grid event
Hinder type and use three-phase fault, fault time is set as 100ms, and faulty line end checkout time delay 50ms is removed.By
It is learnt after transient emulation analysis, there are two Transient Voltage Stability weakness zones altogether in the expansion system of the IEEE39, respectively such as Fig. 5
In weakness zone 1 and weakness zone 2, share 8 there are the line fault of Voltage Instability risk, Voltage Instability region and line
Road is as shown in table 1.
Table 1：There are the region of transient voltage unstability risk and circuits
By taking the 10-13 line faults of Transient Voltage Stability weakness zone 1 as an example, the result of calculation such as table of sensitivity is compensated
Shown in 2, by the compensation sensitivity results based on TVRI indexs and TVFI indexs it is found that the region only has the installation of node 10 or 11
Transient voltage is restored after may make failure after dynamic reactive compensation device, and the idle Site Selection of optimal dynamic in region 1
Position is node 11, by the planning combined analytical method of dynamic reactive compensation device it is found that the region only needs 1 dynamic reactive to mend
Repay device.
Table 2：Addressing compensates sensitivity after circuit 10-13 failures
To the circuit 26-27 failure post-compensations sensitivity analysis of Transient Voltage Stability weakness zone 2, the results are shown in Table 3,
By calculating it is found that the region, which cannot only reach by 1 dynamic reactive compensation device of installation, improves the mesh of Enhancement of Transient Voltage Stability
, 2 dynamic reactive compensation devices are installed using Site Selection combined analytical method and are analyzed, the results showed that, 2 table apparatus can be real
The ability that existing post-fault system restores, and share 3 kinds and wait for that reconnaissance combination can improve Enhancement of Transient Voltage Stability, according to compensation
Sensitivity analysis result is it is found that node 28 and node 29 are respectively mounted dynamic reactive compensation device to changing in Enhancement of Transient Voltage Stability
Kind effect sensitivity highest.
Table 3：Dynamic passive compensation addressing compensates sensitivity after circuit 26-27 failures
Therefore, the embodiment consider Enhancement of Transient Voltage Stability the idle addressing position of optimal dynamic be node 11,28 and
29, by weakness zone it is faulty progress one by one verification it is found that this 3 nodes are used as dynamic reactive Site Selection
Wait for that reconnaissance has good improvement.
In addition, the application range of the present invention is not limited to the technique, mechanism, system of the specific embodiment described in specification
It makes, material composition, means, method and step.From the disclosure, will be easy as those skilled in the art
Ground understands, for current technique that is existing or will developing later, mechanism, manufacture, material composition, means, method or
Step, the knot that wherein they execute the function being substantially the same with the corresponding embodiment of the invention described or acquisition is substantially the same
Fruit can apply them according to the present invention.Therefore, appended claims of the present invention are intended to these techniques, mechanism, system
It makes, material composition, means, method or step are included in its protection domain.
Claims (6)
1. considering the dynamic reactive Site Selection analysis method of Enhancement of Transient Voltage Stability, characterized in that include the following steps：
Step 1：The related data of power grid is obtained, the related data of power grid includes DC transmission system, dynamic reactive compensation device
With the transient state parameter and its control system parameter of generator；
Step 2：Simulation analysis is carried out to the Enhancement of Transient Voltage Stability of power grid, carries out analyzing determining transient voltage by electric network fault
Unstability failure collection, is denoted asAnd according toDistribution the power grid to break down is divided into several Transient Voltage Stabilities
Weakness zone；
Step 3：The failure of Transient Voltage Stability weakness zone is analyzed one by one, and calculates the dynamic under each malfunction
Reactive-load compensation sensitivity determines the node to be compensated of one of electric network fault weakness zone using Site Selection combined analytical method
Number and position need 2 even more compensation point combinations to weakness if 1 compensation point cannot be satisfied steady demand
Region carries out reactive-load compensation；
Step 4：Whether the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones is finished, it is if it is defeated
The dynamic reactive Site Selection for going out all Transient Voltage Stability weakness zones waits for dot position scheme, otherwise goes to step 3 continuation
Site Selection analysis to next weakness zone, until to the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones
Until analysis finishes；
The dynamic passive compensation sensitivity includes restoring the compensation sensitivity of index TVRI based on transient voltageWith based on
Transient voltage fluctuates the compensation sensitivity of index TVFI
The compensation sensitivityCalculating process include the following steps：
(11) transient voltage recovery index TVRI is defined as：
In formula：Ut,iFor in the transient voltage of t moment node i；Ui0For the voltage under node i nominal situation；tcFor transient recovery mistake
Deadline in journey；tclFor electric network fault checkout time；FkFor the fault type of power grid；Wherein, For fault set
It closes；
(12) failure collectionIt is expressed as：
In formula：RG, RUHV, RHVDC, RBRGenerator failure set, extra-high-voltage alternating current failure collection, direct current transportation failure are indicated respectively
Set and line fault set；
(13) it is its difference definition by the TVRI index expressions of formula (1)：
In formula：tsMaterial calculation in being analyzed for time-domain-simulation；
(14) it usesArbitrary node in power grid is calculated, can show that global transient voltage restores index and is：
By formula (4) it is found that global transient voltage restores indexBy all nodes in assessment areaMaximum value
It determines；
Compensation sensitivity table based on TVRI indexs is shown as：
It converts formula (7) to：
In formula：TVRIsIt can be solved by formula (4), QSVCFor reactive compensation capacity；
The compensation sensitivityCalculating process include the following steps：
(21) transient voltage fluctuation index TVFI is defined as：
In formula：NTFor the cycle of transient state time-domain-simulation；NpFor pth after electric network faultthSecondary cycle；Respectively Fk
Failure lower node i is in NpThe minimum and maximum voltage of cycle；
(22) it usesArbitrary node in power grid is calculated, can show that transient voltage fluctuation index is：
(23) the compensation sensitivity table based on TVFI indexs is shown as：
Formula (9) is reduced to：
In formula：TVFIsIt can be solved by formula (6), QSVCFor reactive compensation capacity；
The Site Selection combined analytical method includes the following steps：
(1) Enhancement of Transient Voltage Stability of the whole network is emulated and is analyzed using time-domain simulation program, and according to there are transient state electricity
The failure collection of pressure stability problem is divided into several weakness zones；
(2) it is directed to each Transient Voltage Stability weakness zone, one or more points to be selected may be selected and compensate, Site Selection
Principle is that the Enhancement of Transient Voltage Stability of system is improved using minimum compensation point；
(3) to the transient voltage unstability failure collection in each region of Transient Voltage Stability weakness zone based on the dynamic nothing
Work(compensation sensitivity is calculated and is analyzed one by one, if 1 dynamic reactive compensation device cannot solve Enhancement of Transient Voltage Stability
Problem then needs to be compensated with 2 even more dynamic reactive compensation devices；
(4) the addressing position of each weakness zone is calculated and is screened based on dynamic passive compensation sensitivity, finally obtained
The dynamic reactive Site Selection of all Transient Voltage Stability weakness zones waits for dot position scheme, to improve the transient voltage of the whole network
Stability.
2. the dynamic reactive Site Selection analysis method according to claim 1 for considering Enhancement of Transient Voltage Stability, feature
It is that the failure collection includes generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and line fault.
3. the dynamic reactive Site Selection analysis method according to claim 1 for considering Enhancement of Transient Voltage Stability, feature
It is that the related data of the power grid directly acquires from network system or by input unit typing.
4. considering the dynamic reactive Site Selection analysis system of Enhancement of Transient Voltage Stability, characterized in that including：
Data acquisition module, to obtain the related data of power grid, the related data of power grid include DC transmission system, dynamically without
The transient state parameter and its control system parameter of Reactive power compensation installations and generator；
Simulation analysis module is analyzed to carry out simulation analysis to the Enhancement of Transient Voltage Stability of power grid by electric network fault
It determines transient voltage unstability failure collection, is denoted as
Region division module, to basisDistribution the power grid to break down will to be divided into several Transient Voltage Stabilities thin
Weak-strong test；
Siting analysis module is analyzed one by one to the failure to Transient Voltage Stability weakness zone, and calculates each failure
Dynamic passive compensation sensitivity under state determines one of electric network fault weakness zone using Site Selection combined analytical method
Node to be compensated number and position need 2 even more compensation if 1 compensation point cannot be satisfied steady demand
Point combination carries out reactive-load compensation to weakness zone；
Output module, the dynamic reactive Site Selection to export all Transient Voltage Stability weakness zones wait for dot position side
Case；
The siting analysis module includes dynamic passive compensation Calculation of Sensitivity module and Site Selection combinatory analysis module；
The dynamic passive compensation Calculation of Sensitivity module is sensitive to calculate the compensation based on transient voltage recovery index TVRI
DegreeWith the compensation sensitivity based on transient voltage fluctuation index TVFI
The compensation sensitivityCalculating process include the following steps：
(11) transient voltage recovery index TVRI is defined as：
In formula：Ut,iFor in the transient voltage of t moment node i；Ui0For the voltage under node i nominal situation；tcFor transient recovery mistake
Deadline in journey；tclFor electric network fault checkout time；FkFor the fault type of power grid；Wherein, For fault set
It closes；
(12) failure collectionIt is expressed as：
In formula：RG, RUHV, RHVDC, RBRGenerator failure set, extra-high-voltage alternating current failure collection, direct current transportation failure are indicated respectively
Set and line fault set；
(13) it is its difference definition by the TVRI index expressions of formula (1)：
In formula：tsMaterial calculation in being analyzed for time-domain-simulation；
(14) it usesArbitrary node in power grid is calculated, can show that global transient voltage restores index and is：
By formula (4) it is found that global transient voltage restores indexBy all nodes in assessment areaMaximum value
It determines；
Compensation sensitivity table based on TVRI indexs is shown as：
It converts formula (7) to：
In formula：TVRIsIt can be solved by formula (4), QSVCFor reactive compensation capacity；
The compensation sensitivityCalculating process include the following steps：
(21) transient voltage fluctuation index TVFI is defined as：
In formula：NTFor the cycle of transient state time-domain-simulation；NpFor pth after electric network faultthSecondary cycle；Respectively Fk
Failure lower node i is in NpThe minimum and maximum voltage of cycle；
(22) it usesArbitrary node in power grid is calculated, can show that transient voltage fluctuation index is：
(23) the compensation sensitivity table based on TVFI indexs is shown as：
Formula (9) is reduced to：
In formula：TVFIsIt can be solved by formula (6), QSVCFor reactive compensation capacity；
The Site Selection combinatory analysis module imitates the Enhancement of Transient Voltage Stability of the whole network first with time-domain simulation program
True and analysis, and according to there are problems that the failure collection of Enhancement of Transient Voltage Stability is divided into several weakness zones；For each
Transient Voltage Stability weakness zone may be selected one or more points to be selected and compensate, and the principle of Site Selection is using minimum
Compensation point improve system Enhancement of Transient Voltage Stability；The transient voltage in each region of Transient Voltage Stability weakness zone is lost
Steady failure collection is calculated and is analyzed one by one based on the dynamic passive compensation sensitivity, if 1 dynamic passive compensation dress
Enhancement of Transient Voltage Stability cannot be solved the problems, such as by setting, then needs to be compensated with 2 even more dynamic reactive compensation devices；
The addressing position of each weakness zone is calculated and screened based on dynamic passive compensation sensitivity, finally obtains all transient state
The dynamic reactive Site Selection of voltage stabilization weakness zone waits for dot position scheme, to improve the Enhancement of Transient Voltage Stability of the whole network.
5. the dynamic reactive Site Selection analysis system according to claim 4 for considering Enhancement of Transient Voltage Stability, feature
It is that the failure collection includes generator failure, extra-high-voltage alternating current failure, extra-high voltage direct-current transmission failure and line fault.
6. the dynamic reactive Site Selection analysis system according to claim 4 for considering Enhancement of Transient Voltage Stability, feature
It is that the data acquisition module directly acquires the related data of power grid from network system or by input unit typing power grid
Related data.
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| CN107528323B (en) * | 2017-10-24 | 2020-08-04 | 国网湖南省电力公司 | Optimal configuration method of dynamic reactive power compensation device |
| CN111446721B (en) * | 2020-04-07 | 2021-07-20 | 武汉大学 | Power distribution network voltage regulation control method based on transient voltage sensitivity |
| CN111628501B (en) * | 2020-06-18 | 2023-04-18 | 国网山东省电力公司济南供电公司 | AC/DC large power grid transient voltage stability assessment method and system |
| CN112688341B (en) * | 2020-12-21 | 2023-05-30 | 广东电网有限责任公司广州供电局 | Method and device for selecting configuration site of reactive power compensation equipment of direct-current receiving end power grid |
| CN112803428A (en) * | 2020-12-31 | 2021-05-14 | 国网河北省电力有限公司经济技术研究院 | Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal |
| CN113067347B (en) * | 2021-05-12 | 2022-09-06 | 国网江苏省电力有限公司经济技术研究院 | Alternating current-direct current power grid distributed dynamic reactive power compensation optimization method and system |
| CN113964846B (en) * | 2021-09-10 | 2024-04-02 | 国网浙江宁波市鄞州区供电有限公司 | Dynamic reactive compensation site selection method suitable for multi-feed direct current system |
| CN115510693B (en) * | 2022-11-17 | 2023-03-03 | 国网山东省电力公司济南供电公司 | DC power distribution system converter parameter optimization design method |
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