CN106549376B - The branch comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method - Google Patents
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Classifications
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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 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；Establish two node generating and transmitting system equivalent models on i-node；Establish two node power distribution net branch m equivalent models；Integration processing is carried out to model, calculates equivalent parameters；The comprehensive stability coefficient of power distribution network branch m is calculated according to equivalent parameters；The comprehensive stability coefficient value and most fragile branch of power distribution network are obtained according to the comprehensive stability coefficient of all branches；Generating and transmitting system is introduced into research object by the present invention, 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 completely new collapse of voltage coefficient and traffic overload coefficient, realizes the assessment to power distribution network branch voltage stabilizing power and load bearing capacity, make assessment more comprehensively.
Description
Technical field
The invention belongs to power distribution network safety and stability evaluation technical fields, and in particular to the distribution containing DG based on equivalent node method
Net branch comprehensive stability appraisal procedure.
Background technique
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 stable problem may also occur in distribution system.The safe and stable operation of power distribution network be improve power supply reliability, to
User provides the important guarantee of good power quality.But since more and more distributed generation resources are permeated in distribution system base
In Infrastructure, so that power distribution network has become the multi-power system with decentralized power s from original single supply power supply system,
This makes analysis and the stabilization of the power distribution network under assessment new situation become new challenge.
Currently, research both at home and abroad will be mostly individually will for power distribution network stability analysis and assessment containing distributed generation resource (DG)
Power distribution network is analyzed, and only the processing of equivalent source has been carried out to generating and transmitting system, without substantially effectively hair is transmitted electricity
System is introduced into research object, is disagreed with the increasingly close situation that contacts of hair power transmission network and power distribution network, so that traditional contains
The accuracy of the power distribution network stability analysis assessment of distributed generation resource is not too high.Meanwhile the power distribution network Stability Assessment that tradition is single
Index can not clearly reflect the occurrence of power distribution network collapse of voltage, traffic overload etc. are unstable mechanism.
Summary of the invention
In view of the deficiency of the prior art, it is comprehensive to provide the branch of power distribution network containing DG based on equivalent node method by the present invention
Close stability assessment method.
Technical solution of the present invention:
The branch comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, includes the following steps:
Step 1: generating and transmitting system and power distribution network containing DG being carried out to combine integrated Load flow calculation, obtain the root of power distribution network containing DG
Node voltage Power Flow Information
Step 1-1: the setting root node Initial Voltage Value of power distribution network containing DG and convergence；
Step 1-2: the forward-backward sweep method Load flow calculation of the power distribution network containing DG is carried out, iteration intermediate variable is sought；
Step 1-3: according to iteration intermediate variable, generating and transmitting system Newton-Laphson method Load flow calculation is carried out, is sought containing DG
Power distribution network root node voltage value；
Step 1-4: calculating the voltage difference of root node before and after adjacent iteration twice, if meeting convergence, transmission & distribution joint
Integrated Load flow calculation terminates, and obtains the root node of power distribution network containing DG voltage Power Flow InformationIf not meeting convergence, execute
Step 1-2.
The generating and transmitting system contains N number of node, wherein 1~node M of node is generator node, node M+1~node N
For load node, the root node is the connecting node i, i=M+1, M+2 ... of power distribution network containing DG and the generating and transmitting system, N.
Step 2: generating and transmitting system being carried out to simplify equivalent process, calculates equivalent source voltage and equivalent impedance, obtains i section
Two node generating and transmitting system equivalent models on point；Specific method 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 as follows:
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },For the equivalent source voltage of equivalent two-node model；
For equivalent load；For equivalent impedance；For the transfger impedance between i-node and j node；For equivalent current,For j section
Injection Current on point,For j node voltage,Its value is the bearing power on j node.
Step 3: branch m in power distribution network containing DG is carried out to simplify equivalent process, equivalent impedance is calculated and two node voltages is poor,
The two nodes branch m equivalent model of power distribution network containing DG is obtained, method particularly includes:
For a power distribution network containing DG through step-down transformer access generating and transmitting system, if the Injection Current of photovoltaic and wind-powered electricity generation
It isDG power distribution network branch m will then be contained and be reduced in two node systems voltage difference between two nodesAre as follows:
Wherein,For transformer equivalent impedance；For the electric current for flowing through transformer,For j in the m branch of power distribution network containing DG
The line impedance of sub- branch, NmFor m branch neutron branch number, nM, jPVIt is complete in the sub- branch end-node of the m branch of power distribution network containing DG j
The photovoltaic plant quantity in portion；nM, jWTFor wind-powered electricity generation numbers whole in the sub- branch end-node of the m branch of power distribution network containing DG j；
The branch m equivalent impedance of power distribution network containing DGAre as follows:
Wherein, NtotalFor distributed generation resource quantity whole in power distribution network containing DG.
Step 4: by two node generating and transmitting system equivalent models and two nodes, the branch of power distribution network containing DG m equivalent model is carried out whole
Conjunction processing, calculates equivalent parameters, that is, equivalent impedance, equivalent load node voltage and equivalent load power, obtains the branch of power distribution network containing DG
Road Stability Assessment research model, the equivalent parameters calculate method particularly includes:
Calculate equivalent impedance
Calculate equivalent load node voltage
Calculate equivalent load power
Wherein,For the load general power of the branch of power distribution network containing DG m；Photovoltaic for the branch of power distribution network containing DG m is total
Injecting power,For the total injecting power of wind-powered electricity generation of the branch of power distribution network containing DG m.
Step 5: the collapse of voltage coefficient VDC of branch m in power distribution network containing DG is calculated according to equivalent parametersI, 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)；VN, m 2Indicate equivalent negative
Carry square of node voltage；SEf (i, m)=SI, m(1+cosβI, m), βI, m=φI, m-θI, m；φI, mForPower-factor angle,
θI, mFor equivalent impedanceImpedance angle.
Step 6: successively calculating the comprehensive stability coefficient EDC of all branches in power distribution network containing DGI, m, the power distribution network containing DG it is comprehensive
Close the minimum value min { EDC that the coefficient of stability is each branch comprehensive stability coefficientI, m, comprehensive stability coefficient in the branch of power distribution network containing DG
The smallest branch is the most fragile branch in power distribution network containing DG.
The utility model has the advantages that power distribution network containing the DG branch comprehensive stability appraisal procedure of the invention based on equivalent node method with it is existing
Technology is compared, and is had the advantage that
(1) by the way that substantially effectively generating and transmitting system is introduced into research object, the distribution containing distributed generation resource is improved
The accuracy of net stability analysis assessment, while transmission & distribution Cooperative Analysis ensure that economic power system and safe operation；
(2) it by defining completely new collapse of voltage coefficient and traffic overload coefficient, realizes to containing distributed power distribution network
The assessment of branch voltage stabilizing power and load bearing capacity is commented to comprehensively carry out analysis to power distribution network safety and stability situation
Estimate.
Detailed description of the invention
Fig. 1 is 5 generating and transmitting system structural schematic diagram of IEEE in the specific embodiment of the invention；
Fig. 2 is structural schematic diagram containing distributed power distribution network in the specific embodiment of the invention；
Fig. 3 is the branch comprehensive stability of power distribution network containing the DG assessment side based on equivalent node method of 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 containing distributed power distribution network in the specific embodiment of the invention；
Fig. 6 is the Stability Assessment research model figure of branch containing distributed power distribution network in the specific embodiment of the invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to one embodiment of the present invention.
In present embodiment, accessed with 5 generating and transmitting system interior joint 3 of IEEE a certain containing distributed generation resource
It is illustrated for the power distribution network of (Distributed Generation, DG), 5 generating and transmitting system of IEEE is as shown in Figure 1, contain
5 three node 1,2 two generator nodes of node and node 3, node 4, node load nodes amount to N=5 node.Match containing DG
Power grid is as shown in Figure 2.
As shown in figure 3, the branch comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, including walk as follows
It is rapid:
Step 1: generating and transmitting system and power distribution network containing DG being carried out to combine integrated Load flow calculation, obtain DG power distribution network root section
Point voltage Power Flow Information
Step 1-1: the setting root node Initial Voltage Value of power distribution network containing DG and convergence；
Step 1-2: the forward-backward sweep method Load flow calculation of the power distribution network containing DG is carried out, iteration intermediate variable is sought；
Step 1-3: according to iteration intermediate variable, generating and transmitting system Newton-Laphson method Load flow calculation is carried out, is sought containing DG
Power distribution network root node voltage value；
Step 1-4: calculating the voltage difference of root node before and after adjacent iteration twice, if meeting convergence, transmission & distribution joint
Integrated Load flow calculation terminates, and obtains the root node of power distribution network containing DG voltage Power Flow InformationIf not meeting convergence, execute
Step 1-2.
In present embodiment, after combining integrated Load flow calculation by transmission & distribution, the root node of power distribution network containing DG voltage is obtained,
That is 3 voltage of generating and transmitting system node
Step 2: generating and transmitting system being carried out to simplify equivalent process, calculates equivalent source voltage and equivalent impedance, obtains i section
Two node generating and transmitting system equivalent models on point；Specific method 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 as follows:
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },For the equivalent source voltage of equivalent two-node model；
For equivalent load；Equivalent impedanceFor equivalent impedance；For the transfger impedance between j node and j node；For equivalent electricity
Stream,For the Injection Current on j node,For j node voltage,Its value is the bearing power on j node.
In present embodiment, 5 generating and transmitting system of IEEE, two node as viewed from node 3 is obtained according to above method and is simplified
Equivalent model obtains equivalent source as shown in figure 4, calculatingEquivalent impedance
Step 3: branch m in power distribution network containing DG is carried out to simplify equivalent process, equivalent impedance is calculated and two node voltages is poor,
The two nodes branch m equivalent model of power distribution network containing DG is obtained, method particularly includes:
For a power distribution network containing DG through step-down transformer access generating and transmitting system, if the Injection Current of photovoltaic and wind-powered electricity generation
It isDG power distribution network branch m will then be contained and be reduced in two node systems voltage difference between two nodesAre as follows:
Wherein,For transformer equivalent impedance；For the electric current for flowing through transformer,For j in the m branch of power distribution network containing DG
The line impedance of sub- branch, NmFor m branch neutron branch number, nM, jPVIt is complete in the sub- branch end-node of the m branch of power distribution network containing DG j
The photovoltaic plant quantity in portion；nM, jWTFor wind-powered electricity generation numbers whole in the sub- branch end-node of the m branch of power distribution network containing DG j；
The branch m equivalent impedance of power distribution network containing DGAre as follows:
Wherein, NtotalFor distributed generation resource quantity whole in power distribution network containing DG.
In present embodiment, DG power distribution network three big branch will be contained as assessment object, as shown in Fig. 2, respectively branch
One, including marked as Isosorbide-5-Nitrae, 6 sub- branch, branch two, including the sub- branch marked as 2,5,7, branch three, including marked as 3,
8,9 sub- branch is to be illustrated in following implementation for this three big branch.The injection of photovoltaic plant and wind power plant
Electric current isStep-down transformer equivalent impedanceWhole points in power distribution network containing DG
Cloth number of power sources is Ntotal=5, two nodes for calculating acquisition branch 1, branch 2 and branch 3 simplify system voltage difference and are respectivelyWithAccordingly
Branch equivalent impedance is respectivelyWith
The two node equivalent circuit of the branch of power distribution network containing DG obtained is as shown in Figure 5.
Step 4: by two node generating and transmitting system equivalent models and two nodes, the branch of power distribution network containing DG m equivalent model is carried out whole
Conjunction processing, calculates equivalent parameters, that is, equivalent impedance, equivalent load node voltage and equivalent load power, obtains the branch of power distribution network containing DG
Road Stability Assessment research model, the equivalent parameters calculate method particularly includes:
Calculate equivalent impedance
Calculate equivalent load node voltage
Calculate equivalent load power
Wherein,For the load general power of the branch of power distribution network containing DG m；Photovoltaic for the branch of power distribution network containing DG m is total
Injecting power,For the total injecting power of wind-powered electricity generation of the branch of power distribution network containing DG m.
In present embodiment, the load general power of power distribution network containing DG three big branches is respectively WithThe total injecting power of photovoltaic, wind-powered electricity generation of respective branch WithIt is 9.5+i0.45MVA.The equivalent impedance for calculating two node equivalent Integrated Models is respectivelyWithCorresponding equivalent load
Node voltage is respectivelyWith
Corresponding equivalent load powerWith
The branch Stability Assessment research model of power distribution network containing DG is as shown in Figure 6.
Step 5: the collapse of voltage coefficient VDC of branch m in power distribution network containing DG is calculated according to equivalent parametersI, 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)；VN, m 2Indicate equivalent load
Square of node voltage；SEf (i, m)=SI, m(1+cosβI, m)；βI, m=φI, m-θI, mφI, mForPower-factor angle, θI, mFor
Equivalent impedanceImpedance angle.
In embodiment, the collapse of voltage coefficient for calculating separately 3 branches of power distribution network containing DG 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: successively calculating the comprehensive stability coefficient EDC of all branches in power distribution network containing DGI, m, the power distribution network containing DG it is comprehensive
Close the minimum value min { EDC that the coefficient of stability is each branch comprehensive stability coefficientI, m, comprehensive stability coefficient in the branch of power distribution network containing DG
The smallest branch is the most fragile branch in power distribution network containing DG.
In present embodiment, the minimum value min { EDC of the comprehensive stability coefficient of the power distribution network containing DGI, m}=EDC3,1=
0.7513, the first big branch in power distribution network containing DG is most fragile branch, i.e. branch Isosorbide-5-Nitrae, 6.
Claims (6)
1. the branch comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method, which comprises the steps of:
Step 1: generating and transmitting system and power distribution network containing DG being carried out to combine integrated Load flow calculation, obtain the root node of power distribution network containing DG
Voltage Power Flow InformationThe generating and transmitting system contains N number of node, wherein 1~node M of node is generator node, node M+1
~node N is load node, and the root node is the connecting node i, i=M+1, M+ of power distribution network containing DG and the generating and transmitting system
2 ..., N；
Step 2: generating and transmitting system being subjected to two nodes and simplifies equivalent process, calculates equivalent source voltageAnd equivalent impedance
Obtain two node generating and transmitting system equivalent models on i-node；
Step 3: two nodes being carried out to branch m in power distribution network containing DG and simplify equivalent process, calculate equivalent impedanceAnd equivalent two
Node voltage is poorObtain the two nodes branch m equivalent model of power distribution network containing DG；
Step 4: by two node generating and transmitting system equivalent models and two nodes, the branch m of power distribution network containing DG equivalent model is carried out at integration
Reason, and the equivalent parameters after integration is calculated, the branch of power distribution network containing DG Stability Assessment research model is obtained, the equivalent parameters includes
Equivalent impedanceEquivalent load node voltageWith equivalent load power
Step 5: collapse of voltage coefficient, traffic overload coefficient and the synthesis of branch m in power distribution network containing DG are calculated according to equivalent parameters
The coefficient of stability；
Step 6: successively calculating the comprehensive stability coefficient of all branches in power distribution network containing DG, the comprehensive stability coefficient of power distribution network is each
The minimum value of branch comprehensive stability coefficient, the smallest branch of comprehensive stability coefficient is in power distribution network containing DG in the branch of power distribution network containing DG
Most fragile branch.
2. power distribution network containing the DG branch comprehensive stability appraisal procedure according to claim 1 based on equivalent node method, special
Sign is that the step 1 includes:
Step 1-1: the setting root node Initial Voltage Value of power distribution network containing DG and convergence；
Step 1-2: the forward-backward sweep method Load flow calculation of the power distribution network containing DG is carried out, iteration intermediate variable is sought；
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 sought
Net root node voltage value；
Step 1-4: calculating the voltage difference of root node before and after adjacent iteration twice, if voltage difference meets convergence, transmission & distribution connection
Closing integrated Load flow calculation terminates, and obtains the root node of power distribution network containing DG voltage Power Flow InformationIf voltage difference does not meet convergence mark
Standard thens follow the steps 1-2.
3. power distribution network containing the DG branch comprehensive stability appraisal procedure according to claim 1 based on equivalent node method, special
Sign is, two node generating and transmitting system equivalent model method for building up on the i-node in the step 2 are as follows:
It is defined as follows three variables:
Two node generating and transmitting system Simplified equivalent models on i-node are as follows:
Wherein, G={ 1 ..., M }, L={ M+1 ..., N },For equivalent impedance；For equivalent load；For i-node and j
Transfger impedance between node；For equivalent current,For the Injection Current on j node,For j node voltage,Its value is the bearing power on j node.
4. power distribution network containing the DG branch comprehensive stability appraisal procedure according to claim 1 based on equivalent node method, special
Sign is that the power distribution network branch in the step 3 simplifies equivalent method are as follows:
For a power distribution network containing DG through step-down transformer access generating and transmitting system, if the Injection Current of photovoltaic and wind-powered electricity generation isDG power distribution network branch m will then be contained and be reduced in two node systems voltage difference between two nodesAre as follows:
Wherein,For transformer equivalent impedance；For the electric current for flowing through transformer；For j branch in the m branch of power distribution network containing DG
The line impedance on road, NmFor m branch neutron branch number, nM, jPVIt is whole in the sub- branch end-node of the m branch of power distribution network containing DG j
Photovoltaic plant quantity；nM, jWTFor wind-powered electricity generation numbers whole in the sub- branch end-node of the m branch of power distribution network containing DG j；
The branch of power distribution network containing DG m is reduced to equivalent impedance in two node systemsAre as follows:
Wherein, NtotalFor distributed generation resource quantity whole in power distribution network containing DG.
5. power distribution network containing the DG branch comprehensive stability appraisal procedure according to claim 1 based on equivalent node method, special
Sign is, equivalent parameters, that is, equivalent impedance in the step 4Equivalent load node voltageWith equivalent load powerCircular are as follows:
Equivalent impedance
Equivalent load node voltage
Equivalent load power
Wherein,For the load general power of the branch of power distribution network containing DG m；Photovoltaic for the branch of power distribution network containing DG m always injects
Power,For the total injecting power of wind-powered electricity generation of the branch of power distribution network containing DG m.
6. power distribution network containing the DG branch comprehensive stability appraisal procedure according to claim 1 based on equivalent node method, special
Sign is that the branch voltage of power distribution network containing DG in the step 5 collapses coefficient VDCI, m, traffic overload coefficient LDCI, mIt is steady with synthesis
Determine coefficient EDCI, mCalculation method are as follows:
The collapse of voltage coefficient VDC of the branch of power distribution network containing DG mI, m=VN, m 2-VP, m 2, traffic overload coefficient
The comprehensive stability coefficient EDC of branch mI, mAre as follows:
EDCI, m=VDCI, m+LDCI, m=VN, m 2-2ZI, mSI, m
Wherein,VD-, m 2=Vsi 2-2ZI, mSEf (i, m)；VN, m 2Indicate equivalent load node
Square of voltage；SEf (i, m)=SI, m(1+cosβI, m)；βI, m=φI, m-θI, m, φI, mForPower-factor angle, θI, mFor etc.
Imitate impedanceImpedance angle.
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| CN107508323B (en) * | 2017-09-25 | 2020-04-21 | 国网浙江省电力公司经济技术研究院 | Low-voltage distribution room distributed photovoltaic access capability assessment method and system |
| 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 |
| CN110954775B (en) * | 2019-12-31 | 2021-08-27 | 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 |
| 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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| 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 |
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