CN108321807A - A kind of grid generator difference coefficient setting method and system containing direct current - Google Patents
A kind of grid generator difference coefficient setting method and system containing direct current Download PDFInfo
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- CN108321807A CN108321807A CN201810271924.3A CN201810271924A CN108321807A CN 108321807 A CN108321807 A CN 108321807A CN 201810271924 A CN201810271924 A CN 201810271924A CN 108321807 A CN108321807 A CN 108321807A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a kind of grid generator difference coefficient setting method and system containing direct current, belongs to technical field of power system operation control.It the described method comprises the following steps：The object function in difference coefficient tuning process is built, i.e., multi-period lower hub node voltage standard poor index are minimum in regional power grid；The constraints in difference coefficient tuning process is built, including trend constraint, control variables constraint and security constraint, include generator node, exchange PQ nodes and direct current PQ nodes wherein in trend constraint equation；Object function is solved using particle cluster algorithm, finds one group of one group of difference coefficient for making object function obtain minimum value in the case where meeting constraints, as generator difference coefficient setting valve.The present invention can carry out optimization rapidly and efficiently to the difference coefficient of generator in regional power grid, improve voltage level of power grid.
Description
Technical field
The present invention relates to technical field of power system operation control, it particularly relates to a kind of grid generation containing direct current
Machine difference coefficient setting method.
Background technology
The size of the difference coefficient of generator excited system influences power grid security economical operation, if difference coefficient is excessive, when
When generator tracks reactive load variation, Operating Voltage fluctuation is larger, to influence quality of voltage, increases electricity grid network damage
Consumption and operation risk；If difference coefficient is too small, when the small variation of Operating Voltage, the more idle work(of generator output
Rate will rob idle phenomenon simultaneously for the generating set of parallel running, be unfavorable for engine health operation.
In quick response excitation system, add adjust difference to improve system voltage stability, improve power generation inter-plant without the distribution of work,
There is fairly obvious quickening Reactive-power control speed under DC bipolar block malfunction.But since power plant is to Excitation Adjustment difference system
Several understandings is inadequate, and without determining standard come instruct power plant be arranged excitation difference coefficient, lead to the difference coefficient of part power plant
It is arranged unreasonable, easily causes uneven without the distribution of work between generating set, or even occur robbing idle phenomenon between unit, for spy
Unit near high voltage direct current drop point, if difference coefficient setting is unreasonable, under malfunction, Reactive-power control speed will be with not
On, it is unfavorable for the stabilization of network voltage.The research that it is necessary to carry out influence of the excitation difference coefficient to power grid and distribute rationally,
Reinforce management of the power grid to power plant's excitation difference coefficient, instructs power plant's reasonable disposition difference coefficient, ensure the stabilization of power grid.
Therefore development generator difference coefficient is needed to adjust work, to ensure the safety and economic operation of power grid.The present invention carries
Go out a kind of grid generator difference coefficient setting method containing direct current, it can be to generator difference coefficient in the regional power grid containing direct current
It is adjusted.
Invention content
Goal of the invention：To solve the above problem of the existing technology, it is poor to provide a kind of grid generator tune containing direct current
Coefficient setting method, and provide a kind of grid generator difference coefficient adjusting system containing direct current based on this method.
Technical solution：A kind of grid generator difference coefficient setting method containing direct current, includes the following steps：
Object function in step 1, structure difference coefficient tuning process, i.e., multi-period lower hub node electricity in regional power grid
Press standard deviation requirement minimum；
Step 2 lists constraints in difference coefficient tuning process, including trend constraint, control variables constraint and peace
Staff cultivation, the trend constraint include generator joint constraint, exchange PQ joint constraints and direct current PQ joint constraints；
Step 3 solves object function, and find one group makes object function obtain minimum value in the case where meeting constraints
One group of difference coefficient, this group of difference coefficient is generator difference coefficient setting valve.
In one embodiment of the invention, step 1 is specially：
Substation busbars is the hub node of reactive power/voltage control in regional power grid, and generator difference coefficient, which adjusts target, is
The quality of voltage for improving hub node, with the multi-period lower minimum object function of hub node voltage standard poor index：
In formula, i=1,2 ..., k, k are regional power grid hub node number；J=1,2 ..., N, N are run the period number；For i-th of hub node j-th of operating point voltage；It is flat for voltage of i-th of hub node under N number of operating point
Mean value.
In one embodiment of the invention, step 2 is specially：
The trend constraint includes generator joint constraint, exchange PQ joint constraints and direct current PQ joint constraints；
If in system including altogether n node, number 1 ..., m is PQ nodes, and number m+1 ..., n-1 are generator node,
Number n is balance nodes；
For PQ nodes, if pure exchange node, then power correction equation is：
In formula, Δ Pi、ΔQiThe respectively active power of node i and reactive power correction amount, Pis、QisRespectively node i
The active power and reactive power of injection；Ui、θiThe respectively voltage magnitude and phase angle of node i, Uj、θjThe respectively electricity of node j
Pressure amplitude value and phase angle, θij=θi-θj；Gij、BijFor node admittance matrix element YijReal and imaginary parts；
For PQ nodes, if DC node, then power correction equation is：
In formula, Vdi、IdiThe respectively voltage and Injection Current of DC node i,For the power-factor angle of node i；
For generator node, update equation is：
In formula, βisFor the difference coefficient of generator node i, Δ βiFor the difference coefficient correction amount of generator node i；Uiref
For the voltage reference value of generator node i, QirefFor the reactive power reference qref of generator node i；
The polar form of above-mentioned update equation is represented by：
Based on above-mentioned update equation, trend is carried out to the network of node containing generator, exchange PQ nodes and direct current PQ nodes
It calculates；
The control variables constraint is：It is generator difference coefficient β in regional power grid to control variable, needs to meet：
βmin≤β≤βmax (6)
In formula, βmax、βminRespectively difference coefficient upper limit value and difference coefficient lower limiting value；
The security constraint is：Each node voltage security constraint in regional power grid：Umin≤Ui≤Umax (7)
In formula, Umax、UminRespectively node voltage upper limit value and node voltage lower limiting value；
Each generator node reactive power constraint in regional power grid：QGmin≤QG≤QGmax (8)
In formula, QGIt contributes for generator reactive, QGmin、QGmaxRespectively generator reactive output lower limit and generator reactive
Output upper limit value.
In one embodiment of the invention, step 3 is further：Object function is asked using particle cluster algorithm
Solution.
According to an aspect of the present invention, a kind of grid generator difference coefficient adjusting system containing direct current is provided, including：
Object function builds module, and for building the object function in difference coefficient tuning process, which is used for
It is minimum to characterize multi-period lower hub node voltage standard poor index in regional power grid；
Constraints builds module, for building the constraints in difference coefficient tuning process, the constraints packet
Containing trend constraint, control variables constraint and security constraint, the trend constraint includes generator joint constraint, exchanges PQ nodes about
Beam and direct current PQ joint constraints；
Object function solves module, for being solved to object function, find one group to make in the case where meeting constraints
Object function obtains one group of difference coefficient of minimum value, this group of difference coefficient is generator difference coefficient setting valve.
In one embodiment of the invention, the object function structure module is further used for：
Structure is with the multi-period lower minimum object function of hub node voltage standard poor index：
In formula, i=1,2 ..., k, k are regional power grid hub node number；J=1,2 ..., N, N are run the period number；For i-th of hub node j-th of operating point voltage；It is flat for voltage of i-th of hub node under N number of operating point
Mean value；Substation busbars is the hub node of reactive power/voltage control in regional power grid, and it is to carry that generator difference coefficient, which adjusts target,
The quality of voltage of high hub node.
In one embodiment of the invention, the constraints structure module further comprises that trend constraint builds submodule
Block, control variables constraint structure submodule and security constraint build submodule；
The trend constraint structure submodule is for building power generation joint constraint, exchange PQ joint constraints and direct current PQ nodes
Constraint；
Wherein, the constraint equation of node of generating electricity is：
In formula, βisFor the difference coefficient of generator node i, Δ βiFor the difference coefficient correction amount of generator node i；Uiref
For the voltage reference value of generator node i, QirefFor the reactive power reference qref of generator node i；
Direct current PQ joint constraint equations are：
In formula, Vdi、IdiThe respectively voltage and Injection Current of DC node i,For the power-factor angle of node i；
Exchanging PQ joint constraint equations is：
In formula, Δ Pi、ΔQiThe respectively active power of node i and reactive power correction amount, Pis、QisRespectively node i
The active power and reactive power of injection；Ui、θiThe respectively voltage magnitude and phase angle of node i, Uj、θjThe respectively electricity of node j
Pressure amplitude value and phase angle, θij=θi-θj；Gij、BijFor node admittance matrix element YijReal and imaginary parts；
The polar form of above-mentioned equation is represented by：
Based on above-mentioned update equation, trend is carried out to the network of node containing generator, exchange PQ nodes and direct current PQ nodes
It calculates；
The control variables constraint is：It is generator difference coefficient β in regional power grid to control variable, needs to meet：
βmin≤β≤βmax, in formula, βmax、βminRespectively difference coefficient upper limit value and difference coefficient lower limiting value；
The security constraint is：Each node voltage security constraint in regional power grid：Umin≤Ui≤Umax, in formula, Umax、Umin
Respectively node voltage upper limit value and node voltage lower limiting value；
Each generator node reactive power constraint in regional power grid：QGmin≤QG≤QGmax, in formula, QGFor generator reactive
It contributes, QGmin、QGmaxRespectively generator reactive output lower limit and generator reactive output upper limit value.
In one embodiment of the invention, object function solve module be used for using particle cluster algorithm to object function into
Row solves.
Advantageous effect：Compared with prior art, the beneficial effects of the present invention are：This method can be to generating electricity in regional power grid
Machine difference coefficient optimizes, and improves voltage level of power grid；This method contains DC node and exchanges node, is suitable for handing over straight
Flow serial-parallel power grid.
Description of the drawings
Fig. 1 is a kind of grid generator difference coefficient setting method flow chart containing direct current.
Fig. 2 is to utilize particle swarm optimization algorithm object function algorithm flow chart.
Fig. 3 is somewhere power grid geographical wiring diagram.
Fig. 4 is that difference coefficient adjusts front and back voltage fluctuation curve.
Fig. 5 is that difference coefficient adjusts front and rear part transformer substation voltage fluctuation index curve.
Specific implementation mode
The present invention relates to a kind of grid generator difference coefficient setting method containing direct current, includes the following steps：
A, the object function in difference coefficient tuning process is listed, i.e., multi-period lower hub node voltage mark in regional power grid
Quasi- poor index are minimum；
B, the constraints in difference coefficient tuning process is listed, including trend constraint, control variables constraint and safety are about
Beam includes generator node, exchange PQ nodes and direct current PQ nodes wherein in trend constraint equation；
C, object function is solved using particle cluster algorithm, find one group makes object function in the case where meeting constraints
Obtain one group of difference coefficient of minimum value, as generator difference coefficient setting valve.
In step A, substation busbars is the hub node of reactive power/voltage control in regional power grid, and generator difference coefficient is whole
It is the quality of voltage for improving hub node to set the goal, with the multi-period lower minimum target letter of hub node voltage standard poor index
Number, such as following formula：
In formula, i=1,2 ..., k, k are regional power grid hub node number；J=1,2 ..., N, N are run the period number；For i-th of hub node j-th of operating point voltage；It is flat for voltage of i-th of hub node under N number of operating point
Mean value.
In step B, constraints includes trend constraint, control variables constraint and security constraint, as follows：
(1) trend constraint
If in system including altogether n node, number 1 ..., m is PQ nodes, and number m+1 ..., n-1 are generator node,
Number n is balance nodes.
For PQ nodes, if pure exchange node, then power correction equation is：
In formula, Δ Pi、ΔQiThe respectively active power of node i and reactive power correction amount, Pis、QisRespectively node i
The active power and reactive power of injection；Ui、θiThe respectively voltage magnitude and phase angle of node i, Uj、θjThe respectively electricity of node j
Pressure amplitude value and phase angle, θij=θi-θj；Gij、BijFor node admittance matrix element YijReal and imaginary parts.
For PQ nodes, if DC node, then power correction equation is：
In formula, Vdi、IdiThe respectively voltage and Injection Current of DC node i,For the power-factor angle of node i.
For generator node, update equation is
In formula, βisFor the difference coefficient of generator node i, Δ βiFor the difference coefficient correction amount of generator node i；Uiref
For the voltage reference value of generator node i, QirefFor the reactive power reference qref of generator node i.
The polar form of above-mentioned update equation is represented by：
Node containing generator, exchange PQ nodes and the Load flow calculation steps of direct current PQ nodes are：
1) node admittance matrix Y is formed；
2) each node voltage initial value is set
3) it brings node voltage initial value into update equation, solves amount of unbalance Δ Pi (0)、
4) node voltage initial value is utilized to solve each element in Jacobian matrix；
5) update equation is solved, each node voltage correction amount is obtained
6) each node voltage is calculated newly to be worth：
7) the new value of each node voltage is initially entered into next iteration from third step, until Δ P, Δ Q, Δ β meet essence
Degree requires, and stops iteration.
(2) control variables constraint：
It is generator difference coefficient β in regional power grid to control variable, needs to meet：
βmin≤β≤βmax (8)
In formula, βmax、βminRespectively difference coefficient upper lower limit value.
(3) security constraint
Each node voltage security constraint in regional power grid：
Umin≤Ui≤Umax (9)
In formula, Umax、UminRespectively node voltage upper lower limit value.
Each generator node reactive power constraint in regional power grid：
QGmin≤QG≤QGmax (10)
In formula, QGIt contributes for generator reactive, QGmin、QGmaxRespectively generator reactive output lower and upper limit value.
In step C, when being solved to object function using particle cluster algorithm, population location parameter is exactly that optimization calculates
Control variable, i.e. difference coefficient.Update and iteration generate new location parameter every time, and tide is assigned to according to new location parameter
Control variable in stream calculation, re-starts Load flow calculation.Algorithm flow such as attached drawing 2.
Present invention is further described in detail with reference to the accompanying drawings and in conjunction with the embodiments.But the present invention is not limited to be given
The embodiment gone out.
By taking the power grid of somewhere as an example, geographical wiring diagram is as shown in Fig. 3.Include 26 nodes altogether in the system, wherein
Totally 6 nodes are generator node for Chen Jia, Xin Hai, Tian Wan, Lv Si, Tong Chang, high port, and it is flat to set the maximum Xin Hai power plant of capacity
Weigh node.Remaining 20 power transformation tiny nodes are PQ nodes, wherein Cathay change 1 and Cathay to change 2 be DC node, remaining is pure exchange
Node.Using transformer substation voltage level in improvement system as optimization aim, generator difference coefficient in network is adjusted.
By changing generator and load parameter in the whole network, different flow datas is obtained, come when simulating different operations
Section.This example chooses 50 run the periods altogether.It is analyzed according to upper section, with the power transformation tiny node difference run the period voltage of Fengcheng City etc. 20
The minimum optimization aim of the sum of standard deviation, with the difference coefficient of 5 generator nodes such as Chen Jia, Tian Wan, Lv Si, Tong Chang, high port
Variable in order to control solves generator difference coefficient Optimized model using particle cluster algorithm, finds one group and is meeting constraint
Under the conditions of make object function obtain minimum value one group of difference coefficient.Knot is adjusted in the optimization of generator difference coefficient in this area's power grid
Fruit is as shown in the table.
1 somewhere grid generator difference coefficient of table adjusts front and back value
By taking Fengcheng City station as an example, it is as shown in Fig. 4 that difference coefficient adjusts front and back voltage fluctuation curve.Power plant difference coefficient is whole
Fixed front and back, part transformer substation voltage fluctuation index result is as shown in Fig. 5 in network.As can be seen that power plant difference coefficient is whole
After fixed, the transformer substation voltage curve of cyclical fluctuations is gentler in network, improves the voltage level of network, it was demonstrated that setting method of the present invention
Reasonability.Simultaneously compared with the existing methods, method calculating speed of the invention is fast, required computer resource smaller, section
System resource is saved, faster, effect is more preferable for system call interception speed.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of equivalents to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little equivalents all belong to the scope of protection of the present invention.It is further to note that described in above-mentioned specific implementation mode
Each particular technique feature can be combined by any suitable means in the case of no contradiction.In order to avoid not
Necessary repetition, the present invention no longer separately illustrate various combinations of possible ways.
Claims (8)
1. a kind of grid generator difference coefficient setting method containing direct current, includes the following steps：
Object function in step 1, structure difference coefficient tuning process, i.e., multi-period lower hub node voltage mark in regional power grid
Quasi- poor index are minimum；
Step 2 lists constraints in difference coefficient tuning process, including trend constraint, control variables constraint and safety are about
Beam, the trend constraint include generator joint constraint, exchange PQ joint constraints and direct current PQ joint constraints；
Step 3 solves object function, and find one group makes object function obtain the one of minimum value in the case where meeting constraints
Group difference coefficient, this group of difference coefficient is generator difference coefficient setting valve.
2. a kind of grid generator difference coefficient setting method containing direct current according to claim 1, which is characterized in that step
Rapid 1 is specially：
Substation busbars is the hub node of reactive power/voltage control in regional power grid, and it is to improve that generator difference coefficient, which adjusts target,
The quality of voltage of hub node, with the multi-period lower minimum object function of hub node voltage standard poor index：
In formula, i=1,2 ..., k, k are regional power grid hub node number；J=1,2 ..., N, N are run the period number；It is
Voltage of the i hub node in j-th of operating point；For average voltage of i-th of hub node under N number of operating point.
3. a kind of grid generator difference coefficient setting method containing direct current according to claim 2, which is characterized in that step
Rapid 2 are specially：
The trend constraint includes generator joint constraint, exchange PQ joint constraints and direct current PQ joint constraints；
If in system including altogether n node, number 1 ..., m is PQ nodes, and number m+1 ..., n-1 are generator node, number n
For balance nodes；
For PQ nodes, if pure exchange node, then power correction equation is：
In formula, Δ Pi、ΔQiThe respectively active power of node i and reactive power correction amount, Pis、QisRespectively node i is injected
Active power and reactive power；Ui、θiThe respectively voltage magnitude and phase angle of node i, Uj、θjThe respectively voltage amplitude of node j
Value and phase angle, θij=θi-θj；Gij、BijFor node admittance matrix element YijReal and imaginary parts；
For PQ nodes, if DC node, then power correction equation is：
In formula, Vdi、IdiThe respectively voltage and Injection Current of DC node i,For the power-factor angle of node i；
For generator node, update equation is：
In formula, βisFor the difference coefficient of generator node i, Δ βiFor the difference coefficient correction amount of generator node i；UirefFor hair
The voltage reference value of motor node i, QirefFor the reactive power reference qref of generator node i；
The polar form of above-mentioned update equation is represented by：
Based on above-mentioned update equation, Load flow calculation is carried out to the network of node containing generator, exchange PQ nodes and direct current PQ nodes,
Calculating process is as follows：
1) node admittance matrix Y is formed；
2) each node voltage initial value is set
3) it brings node voltage initial value into update equation, solves amount of unbalance
4) node voltage initial value is utilized to solve each element in Jacobian matrix；
5) update equation is solved, each node voltage correction amount is obtained
6) each node voltage is calculated newly to be worth：
7) the new value of each node voltage is initially entered into next iteration from third step, is wanted until Δ P, Δ Q, Δ β meet precision
It asks, stops iteration；
The control variables constraint is：It is generator difference coefficient β in regional power grid to control variable, needs to meet：
βmin≤β≤βmax (6)
In formula, βmax、βminRespectively difference coefficient upper limit value and difference coefficient lower limiting value；
The security constraint is：Each node voltage security constraint in regional power grid：
Umin≤Ui≤Umax (7)
In formula, Umax、UminRespectively node voltage upper limit value and node voltage lower limiting value；
Each generator node reactive power constraint in regional power grid：QGmin≤QG≤QGmax (8)
In formula, QGIt contributes for generator reactive, QGmin、QGmaxRespectively generator reactive output lower limit and generator reactive are contributed
Upper limit value.
4. a kind of grid generator difference coefficient setting method containing direct current according to claim 3, which is characterized in that step
Rapid 3 are further：Object function is solved using particle cluster algorithm.
5. a kind of grid generator difference coefficient adjusting system containing direct current, which is characterized in that including：
Object function builds module, and for building the object function in difference coefficient tuning process, the object function is for characterizing
Multi-period lower hub node voltage standard poor index are minimum in regional power grid；
Constraints builds module, and for building the constraints in difference coefficient tuning process, the constraints includes tide
Stream constraint, control variables constraint and security constraint, the trend constraint include generator joint constraint, exchange PQ joint constraints and
Direct current PQ joint constraints；
Object function solves module, for being solved to object function, find one group to make target in the case where meeting constraints
Function obtains one group of difference coefficient of minimum value, this group of difference coefficient is generator difference coefficient setting valve.
6. a kind of grid generator difference coefficient adjusting system containing direct current according to claim 5, which is characterized in that institute
Object function structure module is stated to be further used for：
Structure is with the multi-period lower minimum object function of hub node voltage standard poor index：
In formula, i=1,2 ..., k, k are regional power grid hub node number；J=1,2 ..., N, N are run the period number；It is
Voltage of the i hub node in j-th of operating point；For average voltage of i-th of hub node under N number of operating point；Area
Substation busbars is the hub node of reactive power/voltage control in the power grid of domain, and it is raising maincenter section that generator difference coefficient, which adjusts target,
The quality of voltage of point.
7. a kind of grid generator difference coefficient adjusting system containing direct current according to claim 6, which is characterized in that institute
It states constraints structure module and further comprises trend constraint structure submodule, control variables constraint structure submodule and safety about
Beam builds submodule；
The trend constraint structure submodule is for building power generation joint constraint, exchange PQ joint constraints and direct current PQ nodes about
Beam；
Wherein, the constraint equation of node of generating electricity is：
In formula, βisFor the difference coefficient of generator node i, Δ βiFor the difference coefficient correction amount of generator node i；UirefFor hair
The voltage reference value of motor node i, QirefFor the reactive power reference qref of generator node i；
Direct current PQ joint constraint equations are：
In formula, Vdi、IdiThe respectively voltage and Injection Current of DC node i,For the power-factor angle of node i；
Exchanging PQ joint constraint equations is：
In formula, Δ Pi、ΔQiThe respectively active power of node i and reactive power correction amount, Pis、QisRespectively node i is injected
Active power and reactive power；Ui、θiThe respectively voltage magnitude and phase angle of node i, Uj、θjThe respectively voltage amplitude of node j
Value and phase angle, θij=θi-θj；Gij、BijFor node admittance matrix element YijReal and imaginary parts；
The polar form of above-mentioned equation is represented by：
Based on above-mentioned update equation, Load flow calculation is carried out to the network of node containing generator, exchange PQ nodes and direct current PQ nodes；
The control variables constraint is：It is generator difference coefficient β in regional power grid to control variable, needs to meet：
βmin≤β≤βmax, in formula, βmax、βminRespectively difference coefficient upper limit value and difference coefficient lower limiting value；
The security constraint is：Each node voltage security constraint in regional power grid：Umin≤Ui≤Umax, in formula, Umax、UminRespectively
For node voltage upper limit value and node voltage lower limiting value；
Each generator node reactive power constraint in regional power grid：QGmin≤QG≤QGmax, in formula, QGIt contributes for generator reactive,
QGmin、QGmaxRespectively generator reactive output lower limit and generator reactive output upper limit value.
8. a kind of grid generator difference coefficient adjusting system containing direct current according to claim 7, which is characterized in that mesh
Scalar functions solve module for being solved to object function using particle cluster algorithm.
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| CN110380404A (en) * | 2019-04-24 | 2019-10-25 | 国网辽宁省电力有限公司电力科学研究院 | Consider that the power transmission network excitation system difference coefficient of highly energy-consuming point load optimizes setting method |
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