CN105186586B - A kind of method for improving AC-DC hybrid power grid static electric voltage stability - Google Patents
A kind of method for improving AC-DC hybrid power grid static electric voltage stability Download PDFInfo
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Abstract
The present invention provides a kind of method for improving AC-DC hybrid power grid static electric voltage stability, comprises the following steps：Establish the peak load mode simulation model of AC-DC hybrid power grid；Find out voltage most weak spot and voltage time weak spot；Load adjustment is distributed, and then obtains the static voltage stability overall sensitivity of voltage most weak node；The static voltage stability overall sensitivity and reactive-load compensation demand of voltage weak node are calculated using PSD softwares, installs reactive-load compensation equipment additional；The static voltage stability overall sensitivity and air extract of voltage weak node after installation reactive-load compensation equipment are calculated using PSD softwares, the static electric voltage stability of AC-DC hybrid power grid before and after reactive-load compensation equipment is installed in contrast additional.The present invention has the advantages that workable, Consideration is comprehensive, scheme is reasonable, Technological Economy is feasible, result of calculation is clearly with practical value, can be used in directing Electric Power Network Planning and operation concretely, has higher practical value and good market prospects.
Description
Technical field
The present invention relates to a kind of method for improving voltage stability, and in particular to it is static that one kind improves AC-DC hybrid power grid
The method of voltage stability.
Background technology
At present, evaluating the index of static electric voltage stability mainly has voltage magnitude index, various sensitivity indexs, the power abundant
Spend index, minimum singular value index, characteristic value index etc..Voltage magnitude index is very directly perceived, but non-due to voltage change
Linear characteristic, voltage magnitude can not reflect the static voltage stability level and reactive power support ability of system.Various sensitivity
The solution procedure of index does not reflect transient process of the real system from operating point to critical point, without considering part throttle characteristics, generator
It is idle constraint etc. various restrictive factors influence, physical significance be not very clearly, but be to solve for it is fairly simple, quick, together
Sensitivity index under one operating status on different busbares possesses comparativity, can be used as assistant analysis index, and help runs people
Relatively weak the load busbar and weak-strong test of the definite system of member, easy to take measures and carry out effective monitoring in time.Active power margin is non-
Chang Zhiguan, but influenced by the various combination mode of load growth and generated output, there is certain uncertainty；It is idle abundant
Degree and the burden with power ability strong correlation of system, as a result have very strong certainty, and reference value is high, but for the electricity of weak contact
Web frame, Reactive Power Margin can not direct image study region Voltage Stability Level.Minimum singular value index and characteristic value refer to
Similar, explicit physical meaning is marked, but linear characteristic is bad, it is computationally intensive, moreover, for being constrained and idle constraint close to active
The changing rule of generator, minimum singular value index and characteristic value index is unstable, and voltage stabilization is usually requiring concern just
It is the operating status close to active constraint or idle constraint, therefore limits its application.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is steady to provide a kind of raising AC-DC hybrid power grid quiescent voltage by the present invention
Qualitatively method, establishes the peak load mode simulation model of AC-DC hybrid power grid, finds out voltage most weak spot and voltage
Weak spot, and then calculate voltage most weak spot and the respective static voltage stability overall sensitivity reactive-load compensation of voltage time weak spot
Demand
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that：
The present invention provides a kind of method for improving AC-DC hybrid power grid static electric voltage stability, and the described method includes following
Step：
Step 1：Establish the peak load mode simulation model of AC-DC hybrid power grid；
Step 2：Air extract and static voltage stability sensitivity using PSD software calculated load nodes,
And voltage weak node is found out, including voltage most weak spot and voltage time weak spot；
Step 3：Load adjustment is distributed, and then obtains the static voltage stability overall sensitivity of voltage most weak node；
Step 4：Calculating the static voltage stability overall sensitivity of voltage weak node and reactive-load compensation using PSD softwares needs
Ask, install reactive-load compensation equipment additional；
Step 5：The static voltage stability synthesis of voltage weak node after installation reactive-load compensation equipment is calculated using PSD softwares
The static voltage stability of AC-DC hybrid power grid before and after reactive-load compensation equipment is installed in sensitivity and air extract, contrast additional
Property.
In the step 1, the peak load mode simulation model of AC-DC hybrid power grid is established using PSD-BPA softwares,
The peak load refers to the peak load of forcasted years residing for direct current serial-parallel power grid, and the peak load mode simulation model uses
+ 50% constant-impedance model of 50%III types motor, operation voltage level are maintained at 0.95~0.98pu, retain 3% rotation it is standby
With.
The step 2 specifically includes following steps：
Step 2-1：Under peak load mode, using PSD software calculated load nodes air extract and
Static voltage stability sensitivity；
The air extract includes active power margin and Reactive Power Margin；
The static voltage stability sensitivity includes the ratio between load bus reactive power increment and voltage increment dQL/dVL, it is negative
The ratio between lotus node active power increment and voltage increment dPL/dVL, generator node voltage increment and load bus voltage increment it
Compare dUG/dVL, the ratio between generator node reactive power increment and load bus voltage increment dQG/dVL, generator node wattful power
The ratio between rate increment and load bus voltage increment dPG/dVLAnd generator node reactive power increment and the idle work(of load bus
The ratio between rate increment dQG/dQL；Wherein, dQLRepresent load bus reactive power increment, dVLRepresent load bus voltage increment, dPL
Represent load bus active power increment, dUGRepresent generator node voltage increment, dQGRepresent that generator node reactive power increases
Amount, dPGRepresent generator node active power increment, dQLRepresent load bus reactive power increment；
Step 2-2：Find out voltage most weak spot and voltage time weak spot；Specifically have：
Step 2-2-1：Determine the feature of voltage most weak spot and the importance priority of feature；
The voltage most weak spot has following feature：1) static voltage stability sensitivity rate of change is minimum, 2) critical electricity
Press highest, 3) Reactive Power Margin is minimum, 4) reactive reserve vacancy is maximum；1) the importance priority of four features of the above is>2)>3)
>4)；
Step 2-2-2：Define voltage most weak spot and voltage time weak spot；
The voltage most weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains
The node of the business's minimum arrived；
The voltage time weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains
For the business arrived close to the node of voltage most weak spot, the voltage time working voltage of weak spot and the difference of critical voltage are less than 0.03pu；
Step 2-2-3：According to the definition of the feature of voltage most weak spot and voltage most weak spot and voltage time weak spot,
Filter out voltage most weak spot and voltage time weak spot.
In the step 3, Load adjustment distribution so that the working voltage approach to criticality voltage of voltage most weak spot, uses
PSD softwares calculate the static voltage stability sensitivity of voltage most weak node after Load adjustment distribution, select Load adjustment distribution
The minimum static voltage stability sensitivity of front and rear change, if the static voltage stability sensitivity selected is dQL/dVL、dUG/dVLWith
dQG/dVL, Lagrangian is constructed, and then obtain the static voltage stability overall sensitivity of voltage most weak node.
Make x=dQL/dVL, y=dUG/dVLAnd z=dQG/dVLIf the no-power vacancy of load bus is QX, have：
QX=f (x)=dQL/dVL*(UC-UL) (1)
QX=ψ (z)=dQG/dVL*(UC-UL) (3)
Wherein, UCRepresent load bus critical voltage, ULExpression load bus working voltage, f (x),ψ (z) is
Intermediate quantity；
LagrangianL is constructed, is had：
Wherein, λ and μ represents relative weight coefficient；
Local derviation a, b, the c of LagrangianL respectively to x, y, z are sought, i.e.,
Then it is Lagrangian stationary point that local derviation a, b, c, which is added minimum node, asks for the glug of local derviation a, b, c in Lagrangian stationary point
Bright day functional value, can obtain the static voltage stability overall sensitivity S of voltage most weak node, have：
S=(a+ λ * b+ μ * c)/(1+ λ+μ) (5).
The step 4 comprises the following steps：
Step 4-1：According to the static voltage stability overall sensitivity S of voltage most weak node, it is most weak to obtain the voltage
The reactive-load compensation amount D of nodeC, have：
DC=S* Δs U (6)
Wherein, Δ U represents the working voltage increment of voltage most weak node；
With reference to the Reactive Power Margin D of the voltage most weak nodeY, the reactive-load compensation of the voltage most weak node, which is calculated, to be needed
Seek DX, have：
DX=DC-DY (7)
Step 4-2：The static voltage stability overall sensitivity and voltage of voltage time weak node are calculated using PSD softwares
The reactive-load compensation demand of secondary weak node, and install reactive-load compensation equipment additional.
Compared with prior art, the beneficial effects of the present invention are：
1st, the method for the static electric voltage stability provided by the invention for improving AC-DC hybrid power grid can be applied to hand over straight
Flow serial-parallel power grid, it is contemplated that part throttle characteristics, generated power and idle constraint, active and idle coupling in dynamic process are made
With the influence for waiting various factors, reflect change of the voltage stability in different directions, will not mistake applied to Voltage Stability Control
Divide the personal experience for relying on management and running personnel；
2nd, the static voltage stability overall sensitivity of the invention by calculating each weak node, calculates the nothing of each weak node
Work(compensates demand, installs reactive-load compensation equipment additional, and strong foundation is provided for System Reactive Power planning, construction and operation control decision；
3rd, the present invention have it is workable, Consideration is comprehensive, scheme is reasonable, Technological Economy is feasible, result of calculation is clear
Clear with practical value, the advantages that can be used in directing Electric Power Network Planning and operation concretely, have higher practical value and good
Market prospects.
Brief description of the drawings
Fig. 1 is the method flow diagram that AC-DC hybrid power grid static electric voltage stability is improved in the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The most practical index of evaluation static voltage stability level or integrated use margin index and sensitivity index at present.
But active power margin index needs to consider the adaptability to more multi-operating condition, Reactive Power Margin index needs to consider to node institute
In the sensitivity of the Voltage Stability Level in region, and various sensitivity indexs need it is more consider part throttle characteristics in dynamic processes,
The influence of the various factors such as generated power and idle constraint, active and idle coupling.
Research and analyse and show, large change occurs in unstability Near The Critical Point in various voltage stability sensitivity indexs, becomes
Law has relation with the method for operation and constraints.For example, dV/dQ, VCPI sensitivity index can be by Near The Critical Point
0 is faded to, dV/dE, dQG/dQLIndex can gradually become infinitely great in Near The Critical Point, and minimum singular value or characteristic value index exist
Near The Critical Point may gradually become 0, it is also possible to saltus step.The usually sensitivity index of research dV/dQ forms, in voltage approaches
During critical value, quickly, dV/dQ form indexs have mutation to voltage change, so the index of present invention research dQ/dV forms.No
Same sensitivity index reflects change of the voltage stability in different directions, therefore wherein several changing rules can be selected steady
Qualitative best sensitivity index combines to form voltage stabilization overall sensitivity index.Lagrange's method of multipliers is that a kind of synthesis is examined
Consider the optimization algorithm of a variety of restrictive conditions, can be used for the combining weights for asking for sensitivity index.
By calculating the voltage stabilization overall sensitivity index of each weak node, calculating the reactive-load compensation of each weak node needs
Ask, with reference to existing reactive-load compensation equiping actulity, provide the recommended configuration scheme for installing reactive-load compensation equipment additional, including each weak node
Recommended maximum size and put into operation order.Calculate install additional reactive-load compensation after each weak node voltage stabilization overall sensitivity index and its
His voltage stability index, compares the effect installed additional before and after reactive-load compensation.Can be the idle planning, construction and operation control of system
Decision-making provides strong foundation.
The present invention provides a kind of method for improving AC-DC hybrid power grid static electric voltage stability, such as Fig. 1, the method bag
Include following steps：
Step 1：Establish the peak load mode simulation model of AC-DC hybrid power grid；
Step 2：Air extract and static voltage stability sensitivity using PSD software calculated load nodes,
And voltage weak node is found out, including voltage most weak spot and voltage time weak spot；
Step 3：Load adjustment is distributed, and then obtains the static voltage stability overall sensitivity of voltage most weak node；
Step 4：Calculating the static voltage stability overall sensitivity of voltage weak node and reactive-load compensation using PSD softwares needs
Ask, install reactive-load compensation equipment additional；
Step 5：The static voltage stability synthesis of voltage weak node after installation reactive-load compensation equipment is calculated using PSD softwares
The static voltage stability of AC-DC hybrid power grid before and after reactive-load compensation equipment is installed in sensitivity and air extract, contrast additional
Property.
In the step 1, the peak load mode simulation model of AC-DC hybrid power grid is established using PSD-BPA softwares,
The peak load refers to the peak load of forcasted years residing for direct current serial-parallel power grid, and the peak load mode simulation model uses
+ 50% constant-impedance model of 50%III types motor, operation voltage level are maintained at 0.95~0.98pu, retain 3% rotation it is standby
With.
The step 2 specifically includes following steps：
Step 2-1：Under peak load mode, using PSD software calculated load nodes air extract and
Static voltage stability sensitivity；
The air extract includes active power margin and Reactive Power Margin；
The static voltage stability sensitivity includes the ratio between load bus reactive power increment and voltage increment dQL/dVL, it is negative
The ratio between lotus node active power increment and voltage increment dPL/dVL, generator node voltage increment and load bus voltage increment it
Compare dUG/dVL, the ratio between generator node reactive power increment and load bus voltage increment dQG/dVL, generator node wattful power
The ratio between rate increment and load bus voltage increment dPG/dVLAnd generator node reactive power increment and the idle work(of load bus
The ratio between rate increment dQG/dQL；Wherein, dQLRepresent load bus reactive power increment, dVLRepresent load bus voltage increment, dPL
Represent load bus active power increment, dUGRepresent generator node voltage increment, dQGRepresent that generator node reactive power increases
Amount, dPGRepresent generator node active power increment, dQLRepresent load bus reactive power increment；
Step 2-2：Find out voltage most weak spot and voltage time weak spot；Specifically have：
Step 2-2-1：Determine the feature of voltage most weak spot and the importance priority of feature；
The voltage most weak spot has following feature：1) static voltage stability sensitivity rate of change is minimum, 2) critical electricity
Press highest, 3) Reactive Power Margin is minimum, 4) reactive reserve vacancy is maximum；1) the importance priority of four features of the above is>2)>3)
>4)；
Step 2-2-2：Define voltage most weak spot and voltage time weak spot；
The voltage most weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains
The node of the business's minimum arrived；
The voltage time weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains
For the business arrived close to the node of voltage most weak spot, the voltage time working voltage of weak spot and the difference of critical voltage are less than 0.03pu；
Step 2-2-3：According to the definition of the feature of voltage most weak spot and voltage most weak spot and voltage time weak spot,
Filter out voltage most weak spot and voltage time weak spot.
In the step 3, Load adjustment distribution so that the working voltage approach to criticality voltage of voltage most weak spot, uses
PSD softwares calculate the static voltage stability sensitivity of voltage most weak node after Load adjustment distribution, select Load adjustment distribution
The minimum static voltage stability sensitivity of front and rear change, if the static voltage stability sensitivity selected is dQL/dVL、dUG/dVLWith
dQG/dVL, Lagrangian is constructed, and then obtain the static voltage stability overall sensitivity of voltage most weak node.
Make x=dQL/dVL, y=dUG/dVLAnd z=dQG/dVLIf the no-power vacancy of load bus is QX, have：
QX=f (x)=dQL/dVL*(UC-UL) (1)
QX=ψ (z)=dQG/dVL*(UC-UL) (3)
Wherein, UCRepresent load bus critical voltage, ULExpression load bus working voltage, f (x),ψ (z) is
Intermediate quantity；
LagrangianL is constructed, is had：
Wherein, λ and μ represents relative weight coefficient；
Local derviation a, b, the c of LagrangianL respectively to x, y, z are sought, i.e.,
Then it is Lagrangian stationary point that local derviation a, b, c, which is added minimum node, asks for the glug of local derviation a, b, c in Lagrangian stationary point
Bright day functional value, can obtain the static voltage stability overall sensitivity S of voltage most weak node, have：
S=(a+ λ * b+ μ * c)/(1+ λ+μ) (5).
The step 4 comprises the following steps：
Step 4-1：According to the static voltage stability overall sensitivity S of voltage most weak node, it is most weak to obtain the voltage
The reactive-load compensation amount D of nodeC, have：
DC=S* Δs U (6)
Wherein, Δ U represents the working voltage increment of voltage most weak node；
With reference to the Reactive Power Margin D of the voltage most weak nodeY, the reactive-load compensation of the voltage most weak node, which is calculated, to be needed
Seek DX, have：
DX=DC-DY (7)
Step 4-2：The static voltage stability overall sensitivity and voltage of voltage time weak node are calculated using PSD softwares
The reactive-load compensation demand of secondary weak node, and install reactive-load compensation equipment additional.
Illustrate the method detailed process for improving AC-DC hybrid power grid static electric voltage stability using following embodiments；
Step 1, using the magnificent power grid of four main national highways in China stage three as research object power grid, establish three China power grid summer typical case Feng great Fang
Formula.Under the typical way, three magnificent about 6.14 hundred million kilowatts of power grid total loads, wherein 2.43 hundred million kilowatts of East China Power Grid, North China Power Telecommunication Network
1.93 hundred million kilowatts, 1.78 hundred million kilowatts of Central China Power Grid.Under " four main national highways in China " general layout typical operation modes, 8 direct current transportation works are shared
Journey accesses, wherein 4 are superhigh voltage DC, 4 are extra-high voltage direct-current.East China Power Grid is that typical alternating current-direct current series-parallel connection multiple spot is intensive
The power grid of feed-in, by extra-high voltage direct-current by 39,800,000 kilowatts of electricity, by extra-high-voltage alternating current by 10,800,000 kilowatts of electricity, outside by electric rate
About 20%.
Under step 2, the typical way, Southern Zhejiang it is outer higher by electric ratio, voltage is relatively low.Southern Zhejiang (bag
Include Shaoxing, Ningbo, Zhoushan, Taizhou, Wenzhou, Lishui, Jinhua and Quzhou) be load area of concentration, it is existing rather continue, small stream Zhejiang direct current connects
Enter, but its north by 1000kV Zhe Bei-Zhejiang in double back, 500kV Qiaosis-tidal bore double back, 500kV Fuyang-Xiao Pu double backs with
Zhejiang nortel net is connected, and south passes through 1000kV Foochow-Zhejiang south double back, 500kV Ningde-West Zhejiang Province current conversion station double back and Fujian Electric Power Network phase
Connection.For the Reactive Power Margin of Southern Zhejiang 500kV busbares between 22.195~28.716p.u., Reactive Power Margin the lowest corresponds to Zhejiang
Ouhai busbar, secondly all busbares of Zhejiang four；The active power margin of 110kV busbares is between 5.218~18.663p.u., active power margin
The lowest corresponds to Zhejiang scud busbar, secondly Zhejiang Li Yang busbares.The participation factor of each load busbar is calculated, 110kV is female
Line voltage susceptibility maximum is that busbar, the Zhejiang scud busbar such as Ouhai and four all neighbouring scuds, inner ocean, Feng Ming, west pottery face
Boundary's voltage is 0.785.It can be seen that Zhejiang Ouhai and all busbares of Zhejiang four are 500kV voltages most weak spots, Zhejiang scud busbar is about 110kV
Voltage most weak spot.
Step 3, the start by adjusting Southern Zhejiang power grid, increase by electric ratio so that the voltage of Zhejiang scud busbar by
Step reduces, while Voltage Instability critical point is stepped up.When being reached 57% by electric power proportion outside Southern Zhejiang power grid, Ning Shaozhi
Stream, small stream Zhejiang direct current are respectively fed into 8000MW electric power, northern transmission cross-section feed-in about 4200MW electric power, and Fujian is sent section outside and is sent into about
5200MW electric power, Southern Zhejiang load total amount about 44600MW, the working voltage of Zhejiang scud busbar is 0.844, and critical voltage is
0.832.Power grid beyond the scud busbar of Zhejiang is subjected to Thevenin's equivalence, calculates dQL/dVL、dPL/dVL、dUG/dVL、dQG/dVL、
dPG/dVLAnd dQG/dQLDeng 6 kinds of common voltage stability sensitivity indexs, wherein dQL/dVL、dPL/dVL、dUG/dVLDeng 3 kinds of fingers
Target change is most stable, is always progressively to decline, and account for voltage is stably accelerating to reduce.Lagrangian is constructed, is tried to achieve
The weight coefficient of three kinds of sensitivity indexs is respectively 0.71,0.08 and 0.21, combines to form voltage using this 3 kinds of sensitivity indexs
Stablize overall sensitivity index.
Step 4, in order to improve the air extract of busbar, it is necessary to improve local derviation a, b, c at stationary point.By
Ouhai substation 35kV sides increase 120Mvar reactive-load compensation equipment, 110kV busbares scud, inner ocean, Feng Ming, west make pottery it is critical
Voltage can be reduced to less than 0.798；By four all substation 35kV sides increase 120Mvar reactive-load compensation equipment, 110kV
Busbar scud, inner ocean, Feng Ming, the critical voltage of west pottery can be reduced to less than 0.805.Therefore, it is recommended that in Ouhai substation
35kV sides increase the reactive-load compensation equipment of 120Mvar.Similarly analogize, the configuration of network reactive-load compensation equipment can be optimized.
Method provided by the invention can avoid current common method or be dfficult to apply to AC-DC hybrid power grid, or be difficult to
Consider the various factors such as part throttle characteristics in dynamic process, generated power and idle constraint, active and idle coupling
Influence, or be difficult to change of the reflecting voltage stability in different directions, or be dfficult to apply to Voltage Stability Control, or too according to
The defects of relying the personal experience of management and running personnel, have versatile, adaptable, workable, Consideration comprehensively,
Scheme is reasonable, Technological Economy is feasible, result of calculation is clearly with practical value, can be used in directing Electric Power Network Planning and operation etc. concretely
Advantage, has higher practical value and good market prospects.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field with reference to above-described embodiment still can to the present invention embodiment modify or
Equivalent substitution, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent substitution
Within bright claims.
Claims (5)
- A kind of 1. method for improving AC-DC hybrid power grid static electric voltage stability, it is characterised in that：The described method includes following Step：Step 1：Establish the peak load mode simulation model of AC-DC hybrid power grid；Step 2：Air extract and static voltage stability sensitivity using PSD software calculated load nodes, and look for Go out voltage weak node, including voltage most weak spot and voltage time weak spot；Step 3：Load adjustment is distributed, and then obtains the static voltage stability overall sensitivity of voltage most weak node；Step 4：The static voltage stability overall sensitivity and reactive-load compensation demand of voltage weak node are calculated using PSD softwares, Install reactive-load compensation equipment additional；Step 5：Static voltage stability synthesis using voltage weak node after PSD softwares calculating installation reactive-load compensation equipment is sensitive The static electric voltage stability of AC-DC hybrid power grid before and after reactive-load compensation equipment is installed in degree and air extract, contrast additional；In the step 1, the peak load mode simulation model of AC-DC hybrid power grid is established using PSD-BPA softwares, it is described Peak load refers to the peak load of forcasted years residing for direct current serial-parallel power grid, and the peak load mode simulation model uses 50% + 50% constant-impedance model of type III motor, operation voltage level are maintained at 0.95~0.98pu, retain 3% spinning reserve.
- 2. the method according to claim 1 for improving AC-DC hybrid power grid static electric voltage stability, it is characterised in that：Institute State step 2 and specifically include following steps：Step 2-1：Under peak load mode, using the air extract and static state of PSD software calculated load nodes Voltage stability sensitivity；The air extract includes active power margin and Reactive Power Margin；The static voltage stability sensitivity includes the ratio between load bus reactive power increment and voltage increment dQL/dVL, load section Point the ratio between active power increment and voltage increment dPL/dVL, the ratio between generator node voltage increment and load bus voltage increment dUG/dVL, the ratio between generator node reactive power increment and load bus voltage increment dQG/dVL, generator node active power The ratio between increment and load bus voltage increment dPG/dVLAnd generator node reactive power increment and load bus reactive power The ratio between increment dQG/dQL；Wherein, dQLRepresent load bus reactive power increment, dVLRepresent load bus voltage increment, dPLTable Show load bus active power increment, dUGRepresent generator node voltage increment, dQGRepresent that generator node reactive power increases Amount, dPGRepresent generator node active power increment, dQLRepresent load bus reactive power increment；Step 2-2：Find out voltage most weak spot and voltage time weak spot；Specifically have：Step 2-2-1：Determine the feature of voltage most weak spot and the importance priority of feature；The voltage most weak spot has following feature：1) static voltage stability sensitivity rate of change is minimum, and 2) critical voltage is most Height, 3) Reactive Power Margin is minimum, 4) reactive reserve vacancy is maximum；1) the importance priority of four features of the above is>2)>3)>4)；Step 2-2-2：Define voltage most weak spot and voltage time weak spot；The voltage most weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains The node of business's minimum；The voltage time weak spot refers to the difference of working voltage and critical voltage again divided by static voltage stability sensitivity obtains For business close to the node of voltage most weak spot, the voltage time working voltage of weak spot and the difference of critical voltage are less than 0.03pu；Step 2-2-3：According to the definition of the feature of voltage most weak spot and voltage most weak spot and voltage time weak spot, screening Go out voltage most weak spot and voltage time weak spot.
- 3. the method according to claim 2 for improving AC-DC hybrid power grid static electric voltage stability, it is characterised in that：Institute State in step 3, Load adjustment distribution so that the working voltage approach to criticality voltage of voltage most weak spot, is calculated using PSD softwares The static voltage stability sensitivity of voltage most weak node after Load adjustment distribution, selects the front and rear change of Load adjustment distribution minimum Static voltage stability sensitivity, if the static voltage stability sensitivity selected is dQL/dVL、dUG/dVLAnd dQG/dVL, construction Lagrangian, and then obtain the static voltage stability overall sensitivity of voltage most weak node.
- 4. the method according to claim 3 for improving AC-DC hybrid power grid static electric voltage stability, it is characterised in that：Order X=dQL/dVL, y=dUG/dVLAnd z=dQG/dVLIf the no-power vacancy of load bus is QX, have：QX=f (x)=dQL/dVL*(UC-UL) (1)QX=ψ (z)=dQG/dVL*(UC-UL) (3)Wherein, UCRepresent load bus critical voltage, ULExpression load bus working voltage, f (x),ψ (z) is centre Amount；LagrangianL is constructed, is had：Wherein, λ and μ represents relative weight coefficient；Local derviation a, b, the c of LagrangianL respectively to x, y, z are sought, i.e.,In It is that local derviation a, b, c are added the as Lagrangian stationary point of minimum node, it is bright asks for the glug of local derviation a, b, c in Lagrangian stationary point Day functional value, can obtain the static voltage stability overall sensitivity S of voltage most weak node, have：S=(a+ λ * b+ μ * c)/(1+ λ+μ) (5).
- 5. the method according to claim 4 for improving AC-DC hybrid power grid static electric voltage stability, it is characterised in that：Institute Step 4 is stated to comprise the following steps：Step 4-1：According to the static voltage stability overall sensitivity S of voltage most weak node, the voltage most weak node is obtained Reactive-load compensation amount DC, have：DC=S* Δs U (6)Wherein, Δ U represents the working voltage increment of voltage most weak node；With reference to the Reactive Power Margin D of the voltage most weak nodeY, the reactive-load compensation demand D of the voltage most weak node is calculatedX, Have：DX=DC-DY (7)Step 4-2：It is thin using the static voltage stability overall sensitivity and voltage time of PSD softwares calculating voltage time weak node The reactive-load compensation demand of weak bus, and install reactive-load compensation equipment additional.
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