CN108599186A - A kind of non-chrome tanning method - Google Patents
A kind of non-chrome tanning method Download PDFInfo
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- CN108599186A CN108599186A CN201810482236.1A CN201810482236A CN108599186A CN 108599186 A CN108599186 A CN 108599186A CN 201810482236 A CN201810482236 A CN 201810482236A CN 108599186 A CN108599186 A CN 108599186A
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- load
- power factor
- candidate
- busbar
- distributed generation
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
This application provides a kind of non-chrome tanning methods, including：Uncertainties model is carried out to the direction of energy of transmission line of electricity, obtains the quantity load scene equal with loading bus quantity in transmission line of electricity；It calculates separately every loading bus and is all loading the consensus forecast line loss under scene, it is candidate busbar to obtain the highest loading bus of consensus forecast line loss；Calculate the original loads power factor and modified load power factor of candidate busbar；Infiltration coefficient of the distributed generation resource to candidate busbar is obtained, the load apparent energy after candidate busbar injection distributed generation resource is calculated according to infiltration coefficient and modified load power factor；The power factor of distributed generation resource is obtained according to original loads power factor, according to the load apparent energy of the power factor of distributed generation resource and candidate busbar, the reactive power compensation value of non-chrome tanning device is calculated.Non-chrome tanning method provided by the present application predicts that compensation effect is good based on uncertain line loss.
Description
Technical field
This application involves electric power system tide technical field more particularly to a kind of non-chrome tanning methods.
Background technology
Electric energy from power plant be transferred to client it is a series of during, reduce electric energy loss and improve reliability of electric power be weight
Want target.With emerging in large numbers for intelligent power grid technology, distributed power generation is rapidly developed.Distributed power generation utilizes arrangement
Match with existing power grid in power distribution network or the DG being distributed near load (Distributed generator, distributed generation resource)
It closes, substantially increases power supply reliability.
And for electric energy loss, the prior art installs parallel reactive compensation equipment to solve usually in power grid.Using simultaneously
Connection reactive-load compensation equipment provides the reactive power that inductive load is consumed in power grid, is carried to inductive load to reduce electric network source
For and by transmission line of electricity conveying reactive power.Due to reducing flowing of the reactive power in power grid, electricity can be reduced
The electric energy loss caused by conveying reactive power in net.Common parallel reactive compensation equipment has shunt capacitor, parallel reactance
Device or static compensator, STACOM, synchronous capacitor etc..
However, as the power flow in circuit increases, line power loss is corresponding to be increased.Due to electricity needs and power generation
The uncertainty of availability is not known by the power flow of Transmission system yet, therefore the power attenuation in circuit is not known yet, existing
There is technology that compensation is fixed according to the line load situation of setting and will produce larger error.In addition, since DG also has nothing
Work(compensation function, but when the position of DG distributions and improper size setting, the backward power flux from DG can cause higher
System loss.Therefore, how to carry out non-chrome tanning in the power grid for being provided with DG becomes technical staff's urgent need to resolve
Technical barrier.
Invention content
This application provides a kind of non-chrome tanning methods, and the non-chrome tanning to solve the power grid for being provided with DG is asked
Topic.
This application provides a kind of non-chrome tanning method, this method includes：
Uncertainties model is carried out to the direction of energy of transmission line of electricity, obtains quantity and loading bus quantity in transmission line of electricity
Equal load scene；
Consensus forecast line loss of the every loading bus under all load scenes is calculated separately, is obtained described flat
The prediction highest loading bus of line loss is candidate busbar；
Calculate the original loads power factor and modified load power factor of the candidate busbar, wherein described correct is born
Lotus power factor is to install non-chrome tanning device on the candidate busbar and inject the load power after distributed generation resource
Factor；
Infiltration coefficient of the distributed generation resource to the candidate busbar is obtained, according to the infiltration coefficient and modified load
Power factor calculates the candidate busbar and injects the load apparent energy after the distributed generation resource；
The power factor of the distributed generation resource is obtained according to the original loads power factor, according to the distributed electrical
The load apparent energy of the power factor in source and the candidate busbar, is calculated the idle work(of the non-chrome tanning device
Rate offset.
Preferably, uncertainties model is carried out to the transmission line of electricity direction of energy, including：It is negative in each of described transmission line of electricity
Carry and be respectively set a maximum load condition in bus, the maximum load condition include the loading bus can bear it is pre-
If limit load and predetermined limit capacity of trunk.
Preferably, consensus forecast line loss of the every loading bus under all load scenes, packet are calculated separately
It includes：
It calculates under each load scene, the instantaneous line loss and probability density function of every loading bus；
According to the instantaneous line loss and probability density function, the consensus forecast line loss of every loading bus is calculated.
Preferably, the computational methods of the modified load power factor include：According to the original loads power factor and
The default line loss decreasing value of the non-chrome tanning device, is calculated the modified load power factor.
Preferably, the candidate busbar is calculated according to the infiltration coefficient and modified load power factor and injects the distribution
Load apparent energy after formula power supply, including：
The active power of the distributed generation resource is calculated according to the infiltration coefficient；
According to the modified load power factor of the active power of the distributed generation resource and the candidate busbar, it is calculated
The load apparent energy of candidate's busbar.
Preferably, the power factor of the distributed generation resource is obtained according to the original loads power factor, including：It is described
The power factor of distributed generation resource is equal to the original loads power factor of the candidate busbar.
Preferably, it according to the load apparent energy of the power factor of the distributed generation resource and the candidate busbar, calculates
The reactive power compensation value of the non-chrome tanning device is obtained, including：
According to the power factor and active power of the distributed generation resource, the idle work(of the distributed generation resource is calculated
Rate；
According to the reactive power of the load apparent energy and the distributed generation resource of the candidate busbar, reactive power is obtained
Offset.
Non-chrome tanning method advantageous effect provided by the present application includes：
Non-chrome tanning method provided by the present application carries out uncertainty by the direction of energy to transmission line of electricity and builds
Mould calculates separately loading bus and is all loading the consensus forecast line loss under scene, obtains candidate busbar.It is noted on candidate busbar
Enter distributed generation resource and installation non-chrome tanning device, reactive-load compensation effect can be effectively improved.By calculating candidate busbar
After modified load power factor after non-chrome tanning device, and injection distributed generation resource are installed, candidate's busbar
Load apparent energy can calculate reactive power compensation value size, for being configured to non-chrome tanning device.The application
Line loss can be predicted, compensation accuracy is high, and reactive-load compensation is carried out using distributed generation resource and non-chrome tanning device,
Reduce the compensation pressure of non-chrome tanning device.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of non-chrome tanning method flow schematic diagram provided by the embodiments of the present application；
Fig. 2 is a kind of line construction schematic diagram of bus testing system provided by the embodiments of the present application.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The every other embodiment that art personnel are obtained without making creative work should all belong to the application protection
Range.
It is a kind of flow diagram of non-chrome tanning method provided by the embodiments of the present application, such as Fig. 1 institutes referring to Fig. 1
Show, non-chrome tanning method provided by the embodiments of the present application specifically includes following steps：
Step S110：Uncertainties model is carried out to the direction of energy of transmission line of electricity, quantity is obtained and is born with transmission line of electricity
Carry the equal load scene of bus number.
It is a kind of structural schematic diagram of bus testing system provided by the embodiments of the present application, such as Fig. 2 specifically, referring to Fig. 2
Shown, bus testing system provided by the embodiments of the present application is a kind of 5 bus testing systems of IEEE.It is carried in the embodiment of the present application
In 5 bus testing systems of IEEE of confession, A is balance nodes, and voltage perseverance is 1.04 (perunit values), and B, C, D, E are loading bus section
Point, A-E, A-B, B-C, E-D, B-D, D-C are respectively 4 loading bus.
The aggregate demand of 5 bus testing systems of IEEE is 180MW and 55MVAR, and maximum capacity of trunk is 150MVA.
Uncertainties model is carried out to the direction of energy of transmission line of electricity, in particular in each load of the transmission line of electricity
Be respectively set a maximum load condition in bus, the maximum load condition include the loading bus can bear it is default
Limit load and predetermined limit capacity of trunk.In the present embodiment, predetermined limit load is 60MW, and capacity of trunk of limiting in advance is
20MVAR, the load capacity on every loading bus are no more than 150MVA, and 4 obtained scenes and the load of each loading bus are as follows
Table 1：
Table 1
| Load scene | Node 2 | Node 3 | Node 4 | Node 5 |
| 1 | 60MW, 20MVAR | 50MW, 5MVAR | 30MW, 10MVAR | 40MW, 20MVAR |
| 2 | 40MW, 20MVAR | 60MW, 20MVAR | 50MW, 5MVAR | 30MW, 10MVAR |
| 3 | 30MW, 10MVAR | 40MW, 20MVAR | 60MW, 20MVAR | 50MW, 5MVAR |
| 4 | 50MW, 5MVAR | 30MW, 10MVAR | 40MW, 20MVAR | 60MW, 20MVAR |
Step S120：Consensus forecast line loss of the every loading bus under all load scenes is calculated separately,
It is candidate busbar to obtain the highest loading bus of consensus forecast line loss.
Specifically, obtaining the instantaneous line loss of every loading bus by the direction of energy for calculating each load scene.Wherein,
The direction of energy includes power and voltage on loading bus.It is average according to the line loss of multiple every loading bus of instantaneous line loss calculation
Value and standard deviation, obtain the probability density function pr about variable line loss value Lossi, the distribution situation of line loss is reflected with this.
(1) in formula, priFor the probability density function of scene i, μi,σiIt is to load scene i to calculate the flat of corresponding line loss value
Mean value and standard deviation.
Pass through line loss value and its corresponding prValue calculates the consensus forecast line loss (Loss of every circuitavg)：
(2) formula considers the uncertainty of line load, obtained line loss new probability formula (due to line load not really
It is qualitative).Wherein, LossavgTo load the line consumption of scene i, n is load scene quantity, pr,iPower loss for load scenarios i is general
Rate.LossavgHighest circuit is the circuit of pack heaviest, is run near rated temperature and generates highest line loss.By this
The average highest line of line loss is defined as candidate busbar.
Under high-load condition, line loss sharply increases.The circuit of overload or in rated temperature or close to rated temperature
The circuit of Shi Yunhang will lead to the line loss of bigger.Therefore, the circuit of pack heaviest is likely to overload situations occur, in any circuit
Power flow the thermal capacity of circuit is not to be exceeded.
According to these load scenes, the line loss in each scene, and corresponding average value and standard deviation are calculated.Make
The probability of each line loss value is described with probability density function.The average line loss for calculating every circuit is as shown in table 2：
Table 2
| Circuit number | Lossavg |
| (A-E) | 1.7813 |
| (A-B) | 1.2961 |
| (B-C) | 0.8966 |
| (E-D) | 0.3803 |
| (B-D) | 0.2845 |
| (D-C) | 0.1362 |
It can be obtained according to table 2, the line loss of different loads bus is different, and circuit A-E leads to the maximum line loss of 1.78MW, circuit
A-B has the 2nd high 1.29MW losses.Because two lines are all connected to balance nodes (large capacity power generation bus), all transmissions
Electric power to other loads is all transmitted by them, so their line loss height are reasonable.Circuit A-E is defined as candidate mother
Line.
Step S130：Calculate the original loads power factor and modified load power factor of the candidate busbar, wherein institute
It is after installing non-chrome tanning device on the candidate busbar and injecting distributed generation resource to state modified load power factor
Load power factor.
Specifically, it is candidate busbar to obtain circuit A-E according to step S120, reactive-load compensation is carried out on candidate busbar to be carried
High compensation effect.In the present embodiment, the mode of reactive-load compensation is carried out as parallel reactive power compensator and injects distributed generation resource,
In, the decanting point of distributed generation resource is E points.
The original loads power factor PF of candidate busbarloadFor the load power factor for not carrying out before reactive-load compensation, PFload
Calculation formula is as follows：
(3) in formula, PloadIt is total burden with power of candidate busbar, SloadIt is candidate busbar load, PFloadIt is candidate busbar
The power-factor of load, θ are power-factor angles.
After carrying out reactive-load compensation, the load power factor for correcting candidate busbar is needed, is reduced according to candidate busbar needs
Default line loss decreasing value LLR, the load power factor after being corrected are modified load power factor PFcor：
(4) in formula, default line loss decreasing value LLR can reduce demand according to line loss and be configured, and in the present embodiment, LLR is set
It is set to 5%.
Step S140：Infiltration coefficient of the distributed generation resource to the candidate busbar is obtained, according to the infiltration coefficient
The load apparent energy after the candidate busbar injects the distributed generation resource is calculated with modified load power factor.
Specifically, obtaining infiltration coefficient penf of the distributed generation resource to the candidate busbar：
(5) in formula, infiltration coefficient penf may be configured as 10% or 40%, may be alternatively provided as other numerical value, belong to this Shen
Protection domain please.PDGFor the active power of distributed generation resource.
According to the modified load power factor of the active power of the distributed generation resource and the candidate busbar, it is calculated
After distributed generation resource installation, the load apparent energy S of candidate's busbarcor：
ScorReal number and imaginary part are as follows：
Scor=Pcor+jQcor (7)
Pcor+jQcor=(PLoad-PDG)+j(QLoad-QDGT) (8)
Wherein, ScorIt is the new load apparent energy after distributed generation resource installation, QDGTBe installation distributed generation resource and
Total reactive power that parallel reactive power compensator generates, QloadFor total load or burden without work of candidate busbar.
Q can be obtained further according to the calculation formula of candidate busbar loadDGT：
Sload=Pload+jQload (9)
Step S150：The power factor of the distributed generation resource is obtained according to the original loads power factor, according to institute
The load apparent energy for stating the power factor and the candidate busbar of distributed generation resource, is calculated the non-chrome tanning dress
The reactive power compensation value set.
Specifically, when the power factor of distributed generation resource is equal to the power factor of connected load bus, line loss is most
It is small.I.e.：
PFload=PFDG (10)
The power factor that distributed generation resource can be obtained according to (10) formula is equal to the original loads power factor of candidate busbar.
Since the reactive power capacity of distributed generation resource is limited to selected power factor, the nothing of distributed generation resource
Work(power QDGCalculation formula it is as follows：
QDG=PDG(tan(cos-1PFLoad)) (11)
Due in (8) formula, QDGTIt is total reactive power of the distributed generation resource and parallel reactive power compensator generation of installation,
Therefore, the reactive compensation values Q of parallel reactive power compensatorcompIt can be calculate by the following formula：
Qcomp=QDGT-QDG (12)
In the embodiment of the present application, non-chrome tanning device using flexible AC transmission (FACTS), such as：Static nothing
Reactive power compensation installations (SVC), static synchronous compensator (ST) or shunt capacitor compensate reactive power.By comparing at
The most suitable Measures of Reactive Compensation of this selection.
It is candidate busbar that the following table 3, which gives with A-E, and when LLR is set as 5%, the infiltration coefficient of DG is respectively 10% He
DG compensation rates when 40%：
Reactive-load compensation calculates when table 3 reduces by 5% line loss
As seen from the above-described embodiment, non-chrome tanning method provided by the present application passes through the electric power tide to transmission line of electricity
Stream carries out uncertainties model, calculates separately loading bus and is all loading the consensus forecast line loss under scene, obtains candidate mother
Line.Distributed generation resource and installation non-chrome tanning device are injected on candidate busbar, can effectively improve reactive-load compensation effect.
Modified load power factor after non-chrome tanning device, and injection distributed generation resource are installed by the candidate busbar of calculating
Afterwards, the load apparent energy of the candidate busbar, can calculate reactive power compensation value size, for being filled to non-chrome tanning
It sets and is configured.The application can predict line loss compensation accuracy is high, utilizes distributed generation resource and non-chrome tanning
Device carries out reactive-load compensation, reduces the compensation pressure of non-chrome tanning device.
It should be noted that in the present specification, the relational terms of such as " first " and " second " or the like are used merely to
It distinguishes one entity or operation from another entity or operation, and not necessarily requires or imply these entities or operation
Between there are any this actual relationship or sequences.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that circuit structure, article or equipment including a series of elements include not only those
Element, but also include other elements that are not explicitly listed, or further include for this circuit structure, article or equipment
Intrinsic element.In the absence of more restrictions, there is the element that sentence "including a ..." limits, it is not excluded that
There is also other identical elements in circuit structure, article or equipment including the element.
Those skilled in the art will readily occur to its of the application after considering specification and putting into practice the disclosure invented here
His embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the application and includes the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection domain.
Claims (7)
1. a kind of non-chrome tanning method, which is characterized in that including：
Uncertainties model is carried out to the direction of energy of transmission line of electricity, it is equal with loading bus quantity in transmission line of electricity to obtain quantity
Load scene；
Consensus forecast line loss of the every loading bus under all load scenes is calculated separately, is obtained described average pre-
It is candidate busbar that survey line, which damages highest loading bus,；
Calculate the original loads power factor and modified load power factor of the candidate busbar, wherein the modified load work(
Rate factor is to install non-chrome tanning device on the candidate busbar and inject the load power factor after distributed generation resource；
Infiltration coefficient of the distributed generation resource to the candidate busbar is obtained, according to the infiltration coefficient and modified load power
Factor calculates the candidate busbar and injects the load apparent energy after the distributed generation resource；
The power factor of the distributed generation resource is obtained according to the original loads power factor, according to the distributed generation resource
The load apparent energy of power factor and the candidate busbar, the reactive power that the non-chrome tanning device is calculated are mended
Repay value.
2. non-chrome tanning method as described in claim 1, which is characterized in that carried out to the transmission line of electricity direction of energy not true
Qualitative modeling, including：A maximum load condition, the maximum are respectively set on each loading bus of the transmission line of electricity
Loading condition includes the predetermined limit load and predetermined limit capacity of trunk that the loading bus can be born.
3. non-chrome tanning method as described in claim 1, which is characterized in that calculate separately every loading bus and exist
All consensus forecast line losses under the load scene, including：
It calculates under each load scene, the instantaneous line loss and probability density function of every loading bus；
According to the instantaneous line loss and probability density function, the consensus forecast line loss of every loading bus is calculated.
4. non-chrome tanning method as described in claim 1, which is characterized in that the calculating of the modified load power factor
Method includes：According to the default line loss decreasing value of the original loads power factor and the non-chrome tanning device, calculate
Obtain the modified load power factor.
5. non-chrome tanning method as described in claim 1, which is characterized in that according to the infiltration coefficient and modified load
Power factor calculates the candidate busbar and injects the load apparent energy after the distributed generation resource, including：
The active power of the distributed generation resource is calculated according to the infiltration coefficient；
According to the modified load power factor of the active power of the distributed generation resource and the candidate busbar, it is calculated described
The load apparent energy of candidate busbar.
6. non-chrome tanning method as claimed in claim 5, which is characterized in that obtained according to the original loads power factor
To the power factor of the distributed generation resource, including：The power factor of the distributed generation resource is equal to the original of the candidate busbar
Beginning load power factor.
7. non-chrome tanning method as claimed in claim 6, which is characterized in that according to the power of the distributed generation resource because
The load apparent energy of number and the candidate busbar, is calculated the reactive power compensation value of the non-chrome tanning device,
Including：
According to the power factor and active power of the distributed generation resource, the reactive power of the distributed generation resource is calculated；
According to the reactive power of the load apparent energy and the distributed generation resource of the candidate busbar, reactive power compensation value is obtained.
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