CN104467033B - The control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network - Google Patents
The control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network Download PDFInfo
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Abstract
The invention discloses the control and analysis of a kind of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network, the present invention sets up the dependence in AC-DC interconnecting power network based on mutual dependence for existence network theory, reflects alternating current-direct current relation electrical network from the macroscopic aspect of Net Frame of Electric Network.Including step: step 1, analyze Power grid structure and obtain dependence in electrical network；Step 2, based on electromagnetic relationship inequality and power flow equation, calculates interdependency index Dep of both sides' variable；Step 3, analyzes the degree of association between electrical network interior joint variable, and the node that the node variable that makes degree of association be 0.2 20 is corresponding is strong correlation node, according to strong correlation internodal interdependency analysis and the operation that controls alternating current-direct current series-parallel connection bulk power grid.The present invention can deeply disclose AC-DC hybrid power grid operation mechanism from electrical network macroscopic aspect, can be widely applied to various levels of tide optimization.
Description
Technical field
The present invention relates to the control technology of alternating current-direct current series-parallel connection bulk power grid after extra-high voltage accesses, particularly relate to a kind of based on mutually depending on
Deposit the control and analysis of the alternating current-direct current series-parallel connection bulk power grid of network.
Background technology
Along with China's extra-high-voltage alternating current, the construction of DC engineering and constantly advance, between bulk power grid, realize interconnection.The United Nations General Assembly's electricity mutually
The operation control problem of net becomes increasingly complex, and influence factor gets more and more, and how to ensure the safe and stable operation one of bulk power grid
It it is all directly the permanent problem of work about electric power person and Technological research personnel.When extra-high voltage grid alternating current-direct current series-parallel connection runs, if electric
Net suffers the external world or certain disturbance of inside self, may cause cascading failure, cause electrical network unstability, thus cause big face
Long-pending power outage.
When AC system generation three-phase symmetrical fault, if system moment low-voltage is serious, straight-flow system inverter it is possible to
Commutation failure.Commutation failure can produce the biggest instantaneous active power impact to AC system.If fault in ac transmission system not and
Time excision, or make system voltage be still maintained at relatively low level, the most very because of induction-motor load recovery characteristics after failure removal
Straight-flow system generation locking fault may be made because of the sustainable existence of commutation failure.This will cause the most meritorious lacking
The trend that browband comes shifts on a large scale, the collapse of possible induction system.When DC transmission system generation direct current locking fault,
Compensate capacitor by Inverter Station at ordinary times and cannot meet Inverter Station to idle demand, it is necessary to provided this portion by receiving end AC system
Divide no-power vacancy, will result in the receiving end AC system reactive power temporary impact to direct current transportation.If reactive-load compensation can not
In time if excision, alternating voltage raises, and the impact of this instantaneous reactive likely causes the Voltage-stabilizing Problems of receiving end electrical network.
If reactive-load compensation can be excised in time, alternating voltage recovers normal.
Summary of the invention
For problem present in existing extra-high voltage alternating current-direct current serial-parallel power grid control technology, the present invention is based on mutual dependence for existence network
Theory, the relatedness between each key component of electrical network is started with, it is provided that a kind of alternating current-direct current series-parallel connection based on mutual dependence for existence network
The control and analysis of bulk power grid.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that:
The control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network, including step:
Step 1, analyzes Power grid structure, it is thus achieved that in electrical network between important node, between branch road, between important node and branch road
And the dependence between alternating current circuit and DC line；
Step 2, based on electromagnetic relationship inequality and power flow equation, calculates interdependency index Dep of both sides' variable: to change
Amount X and Y, changes variable X, it is thus achieved that the change value Δ Y of another variable Y, thenVariable X and Y are
The identical variable of different nodes or different variable, the identical variable of same circuit or different variable, the identical change of different circuit
Amount or different variable or node and the different variablees of circuit；If the change of variable X causes the amplitude of variation of variable Y
Exceed the bound that industry specifies, then variable X and the node at variable Y place and circuit are respectively strong interdependent node with strong
Interdependent circuit；
Step 3, analyzes the degree of association between electrical network interior joint variable, the joint that the node variable that makes degree of association be 0.2-20 is corresponding
Point is strong correlation node, according to strong correlation internodal interdependency analysis and the operation of control alternating current-direct current series-parallel connection bulk power grid.
Step 1 particularly as follows:
According to basis electric network data and Power grid structure figure, analyze the relation of interdependence in electrical network, including important node
Between relation of interdependence, relation of interdependence between relation of interdependence, important node and branch road between branch road and
Relation of interdependence between alternating current circuit and DC line.
Degree of association between the node variable described in step 2, obtains in the following way:
The changing value making the same variable of node A and B is respectively Δ δ1With Δ δ2, then the phase between the variable of node A and B
Guan Du is Δ δ1/Δδ2。
Present invention additionally comprises: according to the internodal interdependency of strong correlation and the branch road variable mutually interdependent with strong correlation node, point
The analysis grid structure of electrical network and branch road, node are to interdependent decisive and run the size of variable and response speed to depending on
The impact of degree of depositing.
Present invention additionally comprises: obtain strong correlation internodal interdependency situation over time, thus obtain alterating and direct current
The dynamic situation of change of net.
Present invention additionally comprises: analyze the operation of alternating current-direct current electrical network according to the internodal interdependency of strong correlation during cascading failure
Situation.
Present invention additionally comprises: during cascading failure, by controlling strong interdependent node and the chain event of strong interdependent circuit suppression
Barrier.
The present invention is different from tradition analysis method based on mathematical model, uses mutual dependence for existence network theory, it is contemplated that electrical network
In relatedness between each critical component, can deeply disclose AC-DC hybrid power grid operation mechanism from electrical network macroscopic aspect, can be wide
General it is applied to various levels of tide optimization.
The present invention, based on having each several part entity of relation of interdependence in electrical network, is carried out from Power grid structure system aspect
Optimization control scheme is formulated, and can realize the interactive control of the different spaces aspect to whole electrical network, can be as desired to excellent
Change and improve stability and the reliability that alternating current-direct current interconnected power grid runs.
Compared to the prior art, the present invention has following features and a beneficial effect:
1, mutual dependence for existence network theory is used to set up dependence in AC-DC interconnecting power network, from the Macro of Net Frame of Electric Network
Alternating current-direct current relation in face reflection electrical network；
2, propose the analysis method of interdependency static, dynamic, be applicable not only to alternating current-direct current interaction relationship, also can be wide
The analysis of the general dependence being applied to various level electrical network；
3, the analysis method to alternating current-direct current cascading failure dependence is proposed, the interactional space of alternating current-direct current and time
Dynamic process, the available alternating current-direct current dependence to whole electric network influencing, and dynamically situation of change, can improve alternating current-direct current
Analysis efficiency.
Accompanying drawing explanation
Fig. 1 is the particular flow sheet of the present invention；
Fig. 2 is alternating current-direct current relation of interdependence figure in embodiment, and in figure, G represents that power supply node, R represent interdependent node,
L represents that load bus, D represent branch node.
Detailed description of the invention
Technical solution of the present invention is further illustrated below in conjunction with the drawings and specific embodiments.
The inventive method includes step:
Step 1, analyzes Power grid structure, it is thus achieved that in electrical network between important node, between branch road, between important node and branch road
And the relation of interdependence between alternating current circuit and DC line:
Electrical network generally exists dependence, by branch road mutual dependence for existence between node, by node mutual dependence for existence between branch road.
Electrical network there is also between alternating current circuit and DC line relation of interdependence, using current transformer as mutual dependence for existence point, this depend on
The relation of depositing is one of most important relation in electrical network.In addition to both sides are interdependent, electrical network there is also dependence in many ways, as many
End direct current.
In this step, first analyze Power grid structure, determine the electric pressure level of electrical network to be analyzed, i.e. obtain electrical network
Rack level.Then, according to basis electric network data and Power grid structure figure, analyze the relation of interdependence in electrical network,
Including mutually depending between the relation of interdependence between important node, the relation of interdependence between branch road, important node and branch road
Deposit the relation of interdependence between relation and alternating current circuit and DC line.Mutually depending between alternating current circuit and DC line
Relation of depositing is both sides' mutual dependence for existence point by straight-flow system current transformer.Seeing Fig. 2, wherein, node R 1 and node L1 exist
There is dependence, node R 3 and node L3 and there is dependence, node in dependence, node R 2 and node L2
There is dependence, node R 5 and node L5 and there is dependence in R4 and node L4.In addition to both sides are interdependent, also want
To present in electrical network in many ways dependence be analyzed, the mutual dependence for existence such as node L3 with node R 5, node R 5 closes
System.
Step 2, the definition of interdependency index Dep:
The relation between both sides' Available Variables of dependence that exists in electrical network reflects, such as voltage quantities, power and variable etc., this
A little relationship between variables macroscopic views reflect the architectural characteristic of Net Frame of Electric Network, can be used for analyzing voltage stabilization, the angle of attack stable etc..This
Invention uses interdependency to describe things of the like description and the relation of inhomogeneity things, defines interdependency index Dep: to variable X
And Y, change variable X, it is thus achieved that the change value Δ Y of another variable Y, thenΔ X and Δ Y is respectively and becomes
Amount X and the variable quantity of variable Y；If change variable X change, variable Y is constant, i.e. Δ Y=0, then Dep=0；
If the variable quantity of variable X and variable Y is completely the same, then interdependency index Dep=1 of variable X and variable Y；Variable
X and multiple variable Y1,Y2...YnDuring mutual dependence for existence, itself and one of them variable Yi's
Variable X and identical variable or different variable, the identical variable of same circuit or difference that Y can be different node
Variable, the identical variable of different circuit or different variable or node and the different variablees of circuit.
According to basic electromagnetic relationship inequality and power flow equation, calculate interdependency index Dep of both sides, if one becomes
The change of amount causes the amplitude of variation of another variable to exceed industry setting (such as voltage stabilization value lower limit 0.7, the upper limit 1.1),
The two variable place node and circuit are as strong interdependent node and strong interdependent circuit.
Step 3, interdependency analysis:
Analyze the degree of association between electrical network interior joint variable, according to power grid topological graph, such as node R 2 and node L2, obtain
These node variables fundamental relation between any two, the node variable choosing strong correlation carries out interdependency analysis, and these are shadows
Ring the significant variable of alternating current-direct current electric network influencing.According to Power grid structure, to the node variable of strong correlation according to directly related
Being grouped with indirect correlation, Fig. 2 interior joint L5 and node R 5 are directly related node, node L5 and node R 3
For indirect correlation node.To strong interdependent node A, calculate the sensitivity to it of the most interdependent node, i.e. select node A
Variable, such as a power P, the power P variable quantity of other nodes interdependent with it when analyzing the change of its power P,
Obtain interdependency.
Relatedness computation method between node variable is: making node A variable change value is Δ δ1, node B variable change amount
For Δ δ2, the degree of association i.e. ratio Δ δ of its variable change value between node A variable and node B variable1/Δδ2, degree of association is
The node variable of 0.2-20 is the node variable of strong correlation.Degree of association is used for describing the relevant journey between the different identical variable of node
Degree.
Step 4, static dependency analysis in electrical network:
The internodal dependence of strong correlation, and the branch road variable mutually interdependent with strong correlation node is obtained according to step 3,
Branch road variable can be obtained by node variable, as branch power can be calculated by voltage between 2 o'clock.The change of these variablees
Change and directly determine operation of power networks characteristic, thus can analyze the grid structure of electrical network and branch road, node to interdependent decisive,
And run the size of variable and the response speed impact on interdependency, such as transmission capacity and the governing speed of straight-flow system.
Step 5, dynamic dependency analysis in electrical network:
In alternating current-direct current electrical network, interdependency exists in different grid structure levels, spatially exists multiple interdependent between multinode
Relation, as sending end alternating current and direct current to receiving end exchanges, forms triple dependency structure；Interdependency on time, such as protection or peace
The action of full-automatic device, control primary equipment action, even grid structure changes, these the most in time before
Rear association, causes temporal interdependency to change.Such as, after Fig. 2 interior joint D1 fault, then node R 1 and node
Dep=1 between L1.In actual electric network, these dependences are all nonlinear dynamical relations, find out directly related strong correlation
Node variable, can take linearisation means, for multi-space electric network composition, analyzes its interdependent tuple or degree of depth, and time
On Dynamic Variation Analysis.Such as mutual dependence for existence between G2, R2, L2, can directly set up relation between G2, L2.
Step 6, in electrical network, interdependency linkage relationship is analyzed:
It is to affect the major reason that serial-parallel power grid runs that alternating current-direct current interacts, and can reflect interdependency in multi-space level
Comprehensive embodiment, the most even extension has influence on the whole network.During alternating current-direct current interacts the cascading failure caused, deposit
Node in dependence starts to interact, and causes the propagation path of fault, and rack starts change, spatially analyzes event
The series reaction that barrier causes, macroscopically sees the change of interdependent variable and interdependency, can analyze electrical network from these change
Alternating current-direct current runs.
This step particularly as follows:
Alternating current-direct current interacts during the cascading failure caused, and the node that there is initial dependence interacts, and draws
Playing fault propagation, grid structure changes, and calculates the internodal interdependency of strong correlation in change.Fault causes electrical network spatially
Series reaction, macroscopically see interdependent variable and interdependency change, the time on interdependency change, from these changes
Electrical network alternating current-direct current can be analyzed run.It is to affect the major reason that serial-parallel power grid runs that alternating current-direct current interacts, and can reflect many
The comprehensive embodiment of interdependency in space-time level, the most even extension has influence on the whole network.Such as current conversion station fault between L3, R3,
Cause the trend overload being connected with R3, cause R5, R4 fault, cause L5, L4 power failure.
Step 7, the interactive control in alternating current-direct current cascading failure:
Variable is interactive, during change, triggers new change, causes interdependency to change.According to interdependency determine in network strong
Interdependent node and strong interdependent circuit, in fault propagation process, control eager to do well in everything interdependent node and strong interdependent circuit just can be preferably
Suppression.Interactive control between affiliated partner in interdependency, according to static interdependency size and spatial and temporal distributions relation, point
Analysis alternating current-direct current causes node and the circuit of cascading failure when interacting.Rack change in chain process, according to the most interdependent
Degree calculates, and Power grid structure change causes interdependency to change, and follows the tracks of key node and the change affecting power grid cascading
Path.As branch road between R3, R1 can be increased, strengthen the interdependence between R3, R1 region, between L3, R3
Its power flow transfer ability is strengthened during current conversion station fault.
Specific embodiment described herein is only explanation for example to the inventive method.The technical field of the invention
Technical staff described specific embodiment can be made various amendment or supplement or use similar mode to replace
Generation, but without departing from the core methed of the present invention or surmount scope defined in appended claims.
Claims (7)
1. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network, is characterized in that, including step:
Step 1, analyzes Power grid structure, it is thus achieved that in electrical network between important node, between branch road, between important node and branch road
And the dependence between alternating current circuit and DC line；
Step 2, based on electromagnetic relationship inequality and power flow equation, calculates interdependency index Dep of both sides' variable: to change
Amount X and Y, changes variable X, it is thus achieved that the change value Δ Y of another variable Y, thenVariable X and Y are
The identical variable of different nodes or different variable, the identical variable of same circuit or different variable, the identical change of different circuit
Amount or different variable or node and the different variablees of circuit；If the change of variable X causes the amplitude of variation of variable Y
Exceed the upper limit that industry specifies, then node and the circuit at variable X place is respectively strong interdependent node and strong interdependent circuit, becomes
The node at amount Y place and circuit are also respectively strong interdependent node and strong interdependent circuit；
Step 3, analyzes the degree of association between electrical network interior joint variable, the joint that the node variable that makes degree of association be 0.2-20 is corresponding
Point is strong correlation node, according to strong correlation internodal interdependency analysis and the operation of control alternating current-direct current series-parallel connection bulk power grid.
2. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that:
Step 1 particularly as follows:
According to basis electric network data and Power grid structure figure, analyze the relation of interdependence in electrical network, including important node
Between relation of interdependence, relation of interdependence between relation of interdependence, important node and branch road between branch road and
Relation of interdependence between alternating current circuit and DC line.
3. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that:
Degree of association between the node variable described in step 2, obtains in the following way:
The changing value making the same variable of node A and B is respectively Δ δ1With Δ δ2, then the phase between the variable of node A and B
Guan Du is Δ δ1/Δδ2。
4. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that, also include:
According to the internodal interdependency of strong correlation and the branch road variable mutually interdependent with strong correlation node, analyze the rack knot of electrical network
Structure and branch road, node are on the interdependent decisive and size of operation variable and the response speed impact on interdependency.
5. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that, also include:
Obtain strong correlation internodal interdependency situation over time, thus obtain the dynamic change of alternating current-direct current electrical network
Situation.
6. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that, also include:
The ruuning situation of alternating current-direct current electrical network is analyzed according to the internodal interdependency of strong correlation during cascading failure.
7. the control and analysis of alternating current-direct current series-parallel connection bulk power grid based on mutual dependence for existence network as claimed in claim 1,
It is characterized in that, also include:
During cascading failure, by controlling strong interdependent node and strong interdependent circuit suppression cascading failure, consolidate and depend on by force
Deposit the independence of node, reduce mutual dependence for existence point and limit quantity, dependence in reinforcing mat.
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