CN106549376A - The branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method - Google Patents
The branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method Download PDFInfo
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H02J3/383—
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- H02J3/386—
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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]
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, belongs to power distribution network safety and stability evaluation technical field, including by Load flow calculation, obtains power distribution network root node voltage Power Flow Information；The two node generating and transmitting system equivalent models set up on i-node；Set up two node power distribution net branch road m equivalent models；Integration process is carried out to model, equivalent parameterss are calculated；The comprehensive stability coefficient of power distribution network branch road m is calculated according to equivalent parameterss；The comprehensive stability coefficient value and most fragile branch road of power distribution network are obtained according to the comprehensive stability coefficient of all branch roads；The present invention is introduced into generating and transmitting system in object of study, improves the accuracy of the assessment of power distribution network containing DG, and transmission ＆ distribution Cooperative Analysis ensure that economic power system and safe operation；By defining brand-new collapse of voltage coefficient and traffic overload coefficient, the assessment to power distribution network branch voltage stabilizing power and load bearing capacity is realized, assessment is made more comprehensively.
Description
Technical field
The invention belongs to power distribution network safety and stability evaluation technical field, and in particular to the distribution containing DG based on equivalent node method
Net branch road comprehensive stability appraisal procedure.
Background technology
With the development of national economy, distribution network load is sharply increased, and distribution network load ability to bear becomes closer to pole
Limit state so that distribution system is likely to stable problem occur.The safe and stable operation of power distribution network be improve power supply reliability, to
User provides the important guarantee of the good quality of power supply.But, as increasing distributed power source is permeated in distribution system base
In Infrastructure so that power distribution network becomes for a multi-power system with decentralized power s from original single supply electric power system,
This is caused to analyze and is stable into for new challenge with the power distribution network under assessment new situation.
At present, for the power distribution network stability analysis containing distributed power source (DG) and assessment, study many individually will both at home and abroad
Power distribution network is analyzed, and has simply carried out the process of equivalent source to generating and transmitting system, without will substantially effectively send out transmission of electricity
System is introduced in object of study, is disagreed with the increasingly close situation that contacts of the power transmission network with power distribution network is sent out so that traditional contains
The accuracy of the power distribution network stability analysis assessment of distributed power source is not too high.Meanwhile, the single power distribution network Stability Assessment of tradition
Index can not clearly reflect the occurrence of power distribution network collapse of voltage, traffic overload etc. are unstable mechanism.
The content of the invention
For the deficiency that above-mentioned prior art is present, the branch road of power distribution network containing DG that the present invention is provided based on equivalent node method is comprehensive
Close stability assessment method.
Technical scheme：
The branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, comprises the steps：
Step 1：Generating and transmitting system and power distribution network containing DG are carried out combining integrated Load flow calculation, the root of power distribution network containing DG is obtained
Node voltage Power Flow Information
Step 1-1：The root node Initial Voltage Value of power distribution network containing DG and convergence are set；
Step 1-2：The forward-backward sweep method Load flow calculation containing DG power distribution networks is carried out, iteration intermediate variable is asked for；
Step 1-3：According to iteration intermediate variable, generating and transmitting system Newton-Laphson method Load flow calculation is carried out, is asked for containing DG
Power distribution network root node magnitude of voltage；
Step 1-4：The voltage difference of root node before and after the adjacent iteration twice of calculating, if meeting convergence, transmission ＆ distribution joint
Integrated Load flow calculation terminates, and obtains the root node voltage Power Flow Information of power distribution network containing DGIf not meeting convergence, perform
Step 1-2.
The generating and transmitting system contain N number of node, wherein, 1～node M of node be electromotor node, node M+1～node N
For load node, the root node is connecting node i of power distribution network containing DG and the generating and transmitting system, i=M+1, M+2 ..., N.
Step 2：Generating and transmitting system is carried out simplifying equivalent process, equivalent source voltage and equiva lent impedance is calculated, i sections are obtained
Two node generating and transmitting system equivalent models on point；Concrete grammar is to be defined as follows three variables：
Then two node Simplified equivalent models of the generating and transmitting system of node containing N on i-node are：
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },For the equivalent source voltage of equivalent two-node model；
For equivalent load；It is generating and transmitting system two-node model equiva lent impedance for Dai Weinan equiva lent impedances；For i-node and j nodes
Between transfger impedance；For equivalent current,For the injection current on j nodes,For j node voltages,Its value is the bearing power on j nodes.
Step 3：Branch road m in power distribution network containing DG is carried out simplifying equivalent process, equiva lent impedance is calculated and two node voltages is poor,
Two node power distribution network containing DG branch road m equivalent models are obtained, concrete grammar is：
For a Jing step-down transformer accesses the power distribution network containing DG of generating and transmitting system, if the injection current of photovoltaic and wind-powered electricity generation
It isDG power distribution network branch road m will then be contained and be reduced in two node systems voltage difference between two nodesFor：
Wherein,For transformator equiva lent impedance；To flow through the electric current of transformator,It is j in the m branch roads of power distribution network containing DG
The line impedance of sub- branch road, NmFor m branch road neutron branch road numbers, nm,jPVIt is complete in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG
The photovoltaic plant quantity in portion；nm,jWTIt is whole wind-powered electricity generation numbers in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG；
The branch road m equiva lent impedances of power distribution network containing DGFor：
Wherein, NtotalIt is the distributed power source quantity of whole in power distribution network containing DG.
Step 4：Two node generating and transmitting system equivalent models and two node power distribution network containing DG branch road m equivalent models are carried out whole
Conjunction is processed, and it is equiva lent impedance, equivalent load node voltage and equivalent load power to calculate equivalent parameterss, obtains power distribution network containing DG
Road Stability Assessment study model, the equivalent parameterss calculate concrete grammar and are：
Calculate equiva lent impedance
Calculate equivalent load node voltage
Calculate equivalent load power
Wherein,It is the load general power of the branch road m of power distribution network containing DG；Be the branch road m of power distribution network containing DG photovoltaic it is total
Injecting power,It is the total injecting power of wind-powered electricity generation of the branch road m of power distribution network containing DG.
Step 5：The collapse of voltage coefficient VDC of branch road m in power distribution network containing DG is calculated according to equivalent parameterssi,m=Vn,m 2-Vp,m 2、
Traffic overload coefficientWith comprehensive stability coefficient EDCi,m：
EDCi,m=VDCi,m+LDCi,m=Vn,m 2-2Zi,mSi,m
Wherein,Vd-,m 2=Vsi 2-2Zi,mSef(i,m)；Sef(i,m)=Si,m(1+
cosβi,m), βi,m=φi,m-θi,m；φi,mForPower-factor angle, θi,mFor equiva lent impedanceImpedance angle.
Step 6：The comprehensive stability coefficient EDC of all branch roads in power distribution network containing DG is calculated successivelyi,m, containing the comprehensive of DG power distribution networks
Close the minima min { EDC that stability series numerical value is each branch road comprehensive stability coefficienti,m, comprehensive stability system in the branch road of power distribution network containing DG
The minimum branch road of numerical value is the most fragile branch road in power distribution network containing DG.
Beneficial effect：The present invention the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method with it is existing
Technology is compared, with following advantage：
(1) by substantially effectively generating and transmitting system is introduced in object of study, improve the distribution containing distributed power source
The accuracy of net stability analysis assessment, while transmission ＆ distribution Cooperative Analysis ensure that economic power system and safe operation；
(2) by defining brand-new collapse of voltage coefficient and traffic overload coefficient, realize to containing distributed power distribution network
The assessment of branch voltage stabilizing power and load bearing capacity, comments so as to comprehensively be analyzed to power distribution network safety and stability situation
Estimate.
Description of the drawings
Fig. 1 is 5 generating and transmitting system structural representations of IEEE in the specific embodiment of the invention；
Fig. 2 is structural representation containing distributed power distribution network in the specific embodiment of the invention；
Containing DG power distribution network branch road comprehensive stability assessment sides based on equivalent node method of the Fig. 3 for the specific embodiment of the invention
Method flow chart；
Fig. 4 is that two nodes of 5 generating and transmitting system of specific embodiment of the invention IEEE as viewed from node 3 simplify equivalent mould
Type figure；
Fig. 5 is two node equivalent illustraton of model of branch road containing distributed power distribution network in the specific embodiment of the invention；
Fig. 6 is the Stability Assessment study model figure of branch road containing distributed power distribution network in the specific embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings one embodiment of the present invention is elaborated.
In present embodiment, accessed with 5 generating and transmitting system interior joints 3 of IEEE a certain containing distributed power source
Illustrate as a example by the power distribution network of (Distributed Generation, DG), 5 generating and transmitting systems of IEEE are as shown in figure 1, contain
Node 1,2 two electromotor nodes of node and node 3, node 4,5 three load nodes of node amount to N=5 node.Match somebody with somebody containing DG
Electrical network is as shown in Figure 2.
As shown in figure 3, the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, including following step
Suddenly：
Step 1：Generating and transmitting system and power distribution network containing DG are carried out combining integrated Load flow calculation, DG power distribution network root sections are obtained
Point voltage Power Flow Information
Step 1-1：The root node Initial Voltage Value of power distribution network containing DG and convergence are set；
Step 1-2：The forward-backward sweep method Load flow calculation containing DG power distribution networks is carried out, iteration intermediate variable is asked for；
Step 1-3：According to iteration intermediate variable, generating and transmitting system Newton-Laphson method Load flow calculation is carried out, is asked for containing DG
Power distribution network root node magnitude of voltage；
Step 1-4：The voltage difference of root node before and after the adjacent iteration twice of calculating, if meeting convergence, transmission ＆ distribution joint
Integrated Load flow calculation terminates, and obtains the root node voltage Power Flow Information of power distribution network containing DGIf not meeting convergence, perform
Step 1-2.
In present embodiment, after transmission ＆ distribution combine integrated Load flow calculation, the root node voltage of power distribution network containing DG is obtained,
That is 3 voltage of generating and transmitting system node
Step 2：Generating and transmitting system is carried out simplifying equivalent process, equivalent source voltage and equiva lent impedance is calculated, i sections are obtained
Two node generating and transmitting system equivalent models on point；Concrete grammar is to be defined as follows three variables：
Then two node Simplified equivalent models of the generating and transmitting system of node containing N on i-node are：
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },For the equivalent source voltage of equivalent two-node model；
For equivalent load；Equiva lent impedanceFor Dai Weinan equiva lent impedances；For the transfger impedance between i-node and j nodes；For
Equivalent current,For the injection current on j nodes,For j node voltages,Its value is the load on j nodes
Power.
In present embodiment, simplified according to 5 generating and transmitting systems of IEEE, two node that above method is obtained as viewed from node 3
Equivalent model obtains equivalent source as shown in figure 4, calculatingEquiva lent impedance
Step 3：Branch road m in power distribution network containing DG is carried out simplifying equivalent process, equiva lent impedance is calculated and two node voltages is poor,
Two node power distribution network containing DG branch road m equivalent models are obtained, concrete grammar is：
For a Jing step-down transformer accesses the power distribution network containing DG of generating and transmitting system, if the injection current of photovoltaic and wind-powered electricity generation
It isDG power distribution network branch road m will then be contained and be reduced in two node systems voltage difference between two nodesFor：
Wherein,For transformator equiva lent impedance；To flow through the electric current of transformator,It is j in the m branch roads of power distribution network containing DG
The line impedance of sub- branch road, NmFor m branch road neutron branch road numbers, nm,jPVIt is complete in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG
The photovoltaic plant quantity in portion；nm,jWTIt is whole wind-powered electricity generation numbers in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG；
The branch road m equiva lent impedances of power distribution network containing DGFor：
Wherein, NtotalIt is the distributed power source quantity of whole in power distribution network containing DG.
In present embodiment, the big branch road of DG power distribution networks three will be contained as assessment object, as shown in Fig. 2 respectively branch road
One, including being numbered Isosorbide-5-Nitrae, 6 sub- branch road, branch road two, including the sub- branch road for being numbered 2,5,7, branch road three, including being numbered 3,
8,9 sub- branch road, is illustrated for this three big branch roads in implementation below.The injection of photovoltaic plant and wind energy turbine set
Electric current isStep-down transformer equiva lent impedanceWhole distribution in power distribution network containing DG
Formula number of power sources is Ntotal=5, the two node simplified system voltage differences for calculating acquisition branch road 1, branch road 2 and branch road 3 are respectivelyWithCorresponding branch road etc.
Effect impedance is respectivelyWith
The two node equivalent circuit of the branch road of power distribution network containing DG for obtaining is as shown in Figure 5.
Step 4：Two node generating and transmitting system equivalent models and two node power distribution network containing DG branch road m equivalent models are carried out whole
Conjunction is processed, and it is equiva lent impedance, equivalent load node voltage and equivalent load power to calculate equivalent parameterss, obtains power distribution network containing DG
Road Stability Assessment study model, the equivalent parameterss calculate concrete grammar and are：
Calculate equiva lent impedance
Calculate equivalent load node voltage
Calculate equivalent load power
Wherein,It is the load general power of the branch road m of power distribution network containing DG；Be the branch road m of power distribution network containing DG photovoltaic it is total
Injecting power,It is the total injecting power of wind-powered electricity generation of the branch road m of power distribution network containing DG.
In present embodiment, the load general power of the big branch road of power distribution network containing DG three is respectively WithThe photovoltaic of respective branch, wind-powered electricity generation
Total injecting power WithIt is 9.5+i0.45MVA.Calculate two node equivalent Integrated Models
Equiva lent impedance be respectivelyWith
Corresponding equivalent load node voltage is respectivelyWithCorresponding equivalent load power
WithThe branch road Stability Assessment study model of power distribution network containing DG is as shown in Figure 6.
Step 5：The collapse of voltage coefficient VDC of branch road m in power distribution network containing DG is calculated according to equivalent parameterssi,m=Vn,m 2-Vp,m 2、
Traffic overload coefficientWith comprehensive stability coefficient EDCi,m：
EDCi,m=VDCi,m+LDCi,m=Vn,m 2-2Zi,mSi,m
Wherein,Vd-,m 2=Vsi 2-2Zi,mSef(i,m)；Sef(i,m)=Si,m(1+cos
βi,m)；βi,m=φi,m-θi,m, φi,mForPower-factor angle, θi,mFor equiva lent impedanceImpedance angle.
In embodiment, the collapse of voltage coefficient for calculating 3 branch roads of power distribution network containing DG respectively is VDC3,1=0.1444,
VDC3,2=1.5868 and VDC3,3=1.8550, traffic overload coefficient is LDC3,1=0.6069, LDC3,2=0.2970 and LDC3,3
=0.1520, comprehensive stability coefficient is EDC3,1=0.7513, EDC3,2=1.8838 and EDC3,3=2.0070.
Step 6：The comprehensive stability coefficient EDC of all branch roads in power distribution network containing DG is calculated successivelyi,m, containing the comprehensive of DG power distribution networks
Close the minima min { EDC that stability series numerical value is each branch road comprehensive stability coefficienti,m, comprehensive stability system in the branch road of power distribution network containing DG
The minimum branch road of numerical value is the most fragile branch road in power distribution network containing DG.
In present embodiment, the comprehensive stability coefficient value min { EDC containing DG power distribution networksi,m}=EDC3,1=0.7513, containing DG
The first big branch road in power distribution network be most fragile branch road, i.e. branch road Isosorbide-5-Nitrae, 6.
Claims (6)
1. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, it is characterised in that comprise the steps：
Step 1：Generating and transmitting system and power distribution network containing DG are carried out combining integrated Load flow calculation, the root node of power distribution network containing DG is obtained
Voltage Power Flow InformationThe generating and transmitting system contain N number of node, wherein, 1～node M of node be electromotor node, node M+1
～node N is load node, and the root node is connecting node i of power distribution network containing DG and the generating and transmitting system, i=M+1, M+
2 ..., N；
Step 2：Generating and transmitting system is carried out into two nodes and simplifies equivalent process, calculate equivalent source voltageAnd equiva lent impedance
Obtain two node generating and transmitting system equivalent models on i-node；
Step 3：Two nodes are carried out to branch road m in power distribution network containing DG and simplifies equivalent process, calculate equiva lent impedanceAnd equivalent two
Node voltage is poorObtain two node power distribution network containing DG branch road m equivalent models；
Step 4：Two node generating and transmitting system equivalent models and two node power distribution network containing DG branch road m equivalent models are carried out at integration
Reason, and the equivalent parameterss after integrating are calculated, the branch road Stability Assessment study model of power distribution network containing DG is obtained, the equivalent parameterss include
Equiva lent impedanceEquivalent load node voltageWith equivalent load power
Step 5：The collapse of voltage coefficient of branch road m, traffic overload coefficient and synthesis in power distribution network containing DG are calculated according to equivalent parameterss
The coefficient of stability；
Step 6：The comprehensive stability coefficient of all branch roads in power distribution network containing DG is calculated successively, and the comprehensive stability coefficient value of power distribution network is
The minima of each branch road comprehensive stability coefficient, in the branch road of power distribution network containing DG, the minimum branch road of comprehensive stability coefficient value is distribution containing DG
Most fragile branch road in net.
2. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method according to claim 1, which is special
Levy and be, the step 1 includes：
Step 1-1：The root node Initial Voltage Value of power distribution network containing DG and convergence are set；
Step 1-2：The forward-backward sweep method Load flow calculation containing DG power distribution networks is carried out, iteration intermediate variable is asked for；
Step 1-3：According to iteration intermediate variable, generating and transmitting system Newton-Laphson method Load flow calculation is carried out, distribution containing DG is asked for
Net root node magnitude of voltage；
Step 1-4：The voltage difference of root node before and after the adjacent iteration twice of calculating, if voltage difference meets convergence, transmission ＆ distribution connection
Close integrated Load flow calculation to terminate, obtain the root node voltage Power Flow Information of power distribution network containing DGIf voltage difference does not meet convergence mark
Standard, then execution step 1-2.
3. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method according to claim 1, which is special
Levy and be, two node generating and transmitting system equivalent model method for building up on the i-node in the step 2 are：
It is defined as follows three variables：
Two node generating and transmitting system Simplified equivalent models on i-node are：
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },It is generating and transmitting system two-node model etc. for Dai Weinan equiva lent impedances
Effect impedance；For equivalent load；For the transfger impedance between i-node and j nodes；For equivalent current,For j nodes
On injection current,For j node voltages,Its value is the bearing power on j nodes.
4. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method according to claim 1, which is special
Levy and be, the power distribution network branch road in the step 3 simplifies equivalent method and is：
For a Jing step-down transformer accesses the power distribution network containing DG of generating and transmitting system, if the injection current of photovoltaic and wind-powered electricity generation isDG power distribution network branch road m will then be contained and be reduced in two node systems voltage difference between two nodesFor：
Wherein,For transformator equiva lent impedance；To flow through the electric current of transformator；It is j in the m branch roads of power distribution network containing DG
The line impedance on road, NmFor m branch road neutron branch road numbers, nm,jPVIt is whole in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG
Photovoltaic plant quantity；nm,jWTIt is whole wind-powered electricity generation numbers in the sub- branch road end-nodes of the m branch road j of power distribution network containing DG；
The branch road m of power distribution network containing DG is reduced to equiva lent impedance in two node systemsFor：
Wherein, NtotalIt is the distributed power source quantity of whole in power distribution network containing DG.
5. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method according to claim 1, which is special
Levy and be, equivalent parameterss are equiva lent impedance in the step 4Equivalent load node voltageWith equivalent load powerCircular is：
Equiva lent impedance
Equivalent load node voltage
Equivalent load power
Wherein,It is the load general power of the branch road m of power distribution network containing DG；It is that the photovoltaic of the branch road m of power distribution network containing DG always injects work(
Rate,It is the total injecting power of wind-powered electricity generation of the branch road m of power distribution network containing DG.
6. the branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method according to claim 1, which is special
Levy and be, the branch voltage of power distribution network containing the DG collapse coefficient VDC in the step 5i,m, traffic overload coefficient LDCi,mIt is steady with comprehensive
Determine coefficient EDCi,mComputational methods be：
The collapse of voltage coefficient VDC of the branch road m of power distribution network containing DGi,m=Vn,m 2-Vp,m 2, traffic overload coefficient
The comprehensive stability coefficient EDC of branch road mi,mFor：
EDCi,m=VDCi,m+LDCi,m=Vn,m 2-2Zi,mSi,m
Wherein,Vd-,m 2=Vsi 2-2Zi,mSef(i,m)；Sef(i,m)=Si,m(1+cos
βi,m)；βi,m=φi,m-θi,m, φi,mForPower-factor angle, θi,mFor equiva lent impedanceImpedance angle.
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| CN107508323A (en) * | 2017-09-25 | 2017-12-22 | 国网浙江省电力公司经济技术研究院 | A kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system |
| CN107968398A (en) * | 2017-11-30 | 2018-04-27 | 国网江西省电力有限公司电力科学研究院 | A kind of node merger simplifies modeling method |
| CN110954775A (en) * | 2019-12-31 | 2020-04-03 | 中国华能集团清洁能源技术研究院有限公司 | Generator, power transmission line stability degree measuring method and power grid control system |
| CN111799781A (en) * | 2020-06-29 | 2020-10-20 | 中国兵器科学研究院 | Method and device for analyzing and processing power system |
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| CN101976836A (en) * | 2010-09-30 | 2011-02-16 | 河海大学 | Method for statically analyzing voltage stabilization of VSC-HVDC (Voltage-Sourced Converter-High Voltage Director Current) containing AC and DC system |
| WO2015150577A1 (en) * | 2014-04-04 | 2015-10-08 | Danmarks Tekniske Universitet | Thévenin equivalent based static contingency assessment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101976836A (en) * | 2010-09-30 | 2011-02-16 | 河海大学 | Method for statically analyzing voltage stabilization of VSC-HVDC (Voltage-Sourced Converter-High Voltage Director Current) containing AC and DC system |
| WO2015150577A1 (en) * | 2014-04-04 | 2015-10-08 | Danmarks Tekniske Universitet | Thévenin equivalent based static contingency assessment |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508323A (en) * | 2017-09-25 | 2017-12-22 | 国网浙江省电力公司经济技术研究院 | A kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system |
| CN107968398A (en) * | 2017-11-30 | 2018-04-27 | 国网江西省电力有限公司电力科学研究院 | A kind of node merger simplifies modeling method |
| CN107968398B (en) * | 2017-11-30 | 2020-09-11 | 国网江西省电力有限公司电力科学研究院 | Node merging simplified modeling method |
| CN110954775A (en) * | 2019-12-31 | 2020-04-03 | 中国华能集团清洁能源技术研究院有限公司 | Generator, power transmission line stability degree measuring method and power grid control system |
| CN111799781A (en) * | 2020-06-29 | 2020-10-20 | 中国兵器科学研究院 | Method and device for analyzing and processing power system |
| CN111799781B (en) * | 2020-06-29 | 2021-06-11 | 中国兵器科学研究院 | Method and device for analyzing and processing power system |
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