CN107171329A - A kind of distribution power system load flow calculation method containing new-energy grid-connected - Google Patents
A kind of distribution power system load flow calculation method containing new-energy grid-connected Download PDFInfo
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- CN107171329A CN107171329A CN201710562352.XA CN201710562352A CN107171329A CN 107171329 A CN107171329 A CN 107171329A CN 201710562352 A CN201710562352 A CN 201710562352A CN 107171329 A CN107171329 A CN 107171329A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 26
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- 239000011159 matrix material Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 4
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- 239000000446 fuel Substances 0.000 claims description 3
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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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- 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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Abstract
A kind of distribution power system load flow calculation method containing new-energy grid-connected of the present invention belongs to field of new energy generation, refers to a kind of calculating of distribution power flow.Method includes 1）Initial data is obtained from system node parameter list, branch parameters table and new energy parameter list；2）By new energy type by step 1）Acquired initial data is equivalent into different types of node；3）By step 2）In PV types and PI type new energy be converted into manageable PQ types new energy；4）Correct step 2）In each node active power and reactive power；5）Using improved Forward and backward substitution method calculation procedure 2）In each node voltage；If the voltage difference maximum of the adjacent iteration twice of all nodes meets certain precision, calculate and terminate, otherwise output result, continues to iterate to calculate.The present invention can take into account various different new-energy grid-connecteds simultaneously；Iteration is simple, and iterations is few, and computational efficiency is high.
Description
Technical field
A kind of distribution power system load flow calculation method containing new-energy grid-connected of the present invention belongs to field of new energy generation, refers to
A kind of calculating of distribution power flow.
Background technology
As environment and energy problem are increasingly serious, new energy power generation technology broad development, new energy bag common at present
Wind generator system, solar power system, generation system of micro turbine, fuel cell etc. are included, its advantage is wiper ring
Electrical stability is protected and improves, after new energy accesses power distribution network, the power supply mode of power distribution network is unidirectionally powered from single supply to be changed into
Many power supply bidirectional power supplies, may change topological structure and the trend distribution of first wife's power network.
At present mainly have to the Flow Solution of Distribution Networks containing new-energy grid-connected Newton-Laphson method, quick decoupling method and
Forward-backward sweep method, first two method the Load flow calculation of power distribution network is occurred can not convergent situation, and it is traditional before push back generation
Method can only handle PQ nodes, it is impossible to take into account PQ, PV, PI node.
The content of the invention
The purpose of the present invention is to provide a kind of distribution power system load flow calculation side containing new-energy grid-connected according to above-mentioned weak point
Method, realizes that the trend distribution that various different new energy are accessed with power distribution network is calculated, the forward-backward sweep method after the improvement of use
PQ, PV, PI node can be taken into account, and iterative formula is simple, computational efficiency is high.
The present invention takes following technical scheme to realize：
A kind of distribution power system load flow calculation method containing new-energy grid-connected, comprises the following steps：
1）Initial data is obtained from system node parameter list, branch parameters table and new energy parameter list；
2）By new energy type by step 1）Acquired initial data is equivalent into different types of node；
3）By step 2）In PV types and PI type new energy be converted into manageable PQ types new energy；
4）Correct step 2）In each node active power and reactive power；
5）Using improved Forward and backward substitution method calculation procedure 2）In each node voltage；
If the voltage difference maximum of the adjacent iteration twice of all nodes meets certain precision, calculate and terminate, output result is no
Then, continue to iterate to calculate.
Step 1）Described in system node parameter list include power distribution network nodes, the node voltage amplitude and phase of balance nodes
Angle, the active power of PV node and node voltage amplitude, the active power of PQ nodes and reactive power, the active power of PI nodes
And Injection Current.
Step 1）Described in system branch parameter list include branch road number, first node, end-node, branch resistance and branch road electricity
It is anti-.
Step 1）Described in new energy parameter list include grid-connected node number, power supply capacity and new energy type.
Step 2）Described in new energy type include asynchronous wind driven generator, the photovoltaic by current control grid-connected inverters
The new energy such as electricity generation system, miniature gas turbine, fuel cell and the wind-driven generator, too that grid-connected inverters are controlled by voltage
Positive energy photovoltaic cell etc..
Step 2）It is middle that new energy is equivalent into different types of node including asynchronous wind driven generator is equivalent into PQ sections
Point, will be equivalent into PI nodes by the new energy of current control grid-connected inverters, will control the new of grid-connected inverters by voltage
The energy is equivalent into PV node.
Step 3) in PI nodes are converted into PQ nodes computation model be, wherein,
ForkThe voltage magnitude of the PI nodes of secondary iteration,For the constant active power value of PI nodes,For the constant injection electricity of PI nodes
Flow valuve；The computation model that PV node is converted into PQ nodes is, wherein,For PV node
Node reactance,ForkThe real part and the difference of given voltage of the PV node voltage of secondary iteration,For the constant active of PV node
Performance number,For the constant node voltage value of PV node,ForkIt is secondary to iterate to calculate the node reactive power value drawn.
Step 5）Described in improved Forward and backward substitution method computation model be, wherein,ForThe matrix of rank,ZForIt is the impedance perunit value of every section of branch road, other positions on the matrix of rank, matrix leading diagonal
All it is 0,CForThe incidence matrix of the branch current of rank,For the injecting power of node,It isk-1Secondary iterative calculation is drawn
Node voltage value.
Compared with prior art, its remarkable advantage is the present invention：（1）Various different new-energy grid-connecteds can be taken into account simultaneously；
（2）Node voltage is iterated to calculate using incidence matrix, iteration is simple, and computational efficiency is high；（3）With PV node voltage difference judge and
Each node voltage difference judges synchronous progress convergence judgement, and iterations is few, efficiency high.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of the distribution power system load flow calculation method containing new-energy grid-connected of the present invention；
Fig. 2 is IEEE33 node power distribution nets in a kind of distribution power system load flow calculation embodiment of the method one containing new-energy grid-connected of the present invention
Case schematic diagram；
Fig. 3 is IEEE33 node power distribution nets in a kind of distribution power system load flow calculation embodiment of the method one containing new-energy grid-connected of the present invention
Calculation of tidal current figure.
One is to obtain initial data from system node parameter list, branch parameters table and new energy parameter list in Fig. 1；Two be by
New energy type is equivalent into different types of node by its；Three be that PV types and PI type new energy are converted into manageable PQ types
New energy；Four be the active power and reactive power for correcting each node；Five be to calculate each node with improved Forward and backward substitution method
Voltage.
The point that Fig. 2 acceptances of the bid have sequence number represents node.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that embodiment described herein is only to explain the present invention,
Do not limit the present invention.
It is shown in Figure 1, it is a kind of distribution power system load flow calculation embodiment of the method one containing new-energy grid-connected of the present invention
Schematic flow sheet.As shown in figure 1, a kind of distribution power system load flow calculation method containing new-energy grid-connected in the present embodiment is including as follows
Step：
Step 1, by taking IEEE33 node power distributions net as shown in Figure 2 as an example, from system node parameter list, branch parameters table and new energy
Parameter list obtains initial data；System node parameter list includes power distribution network nodes, the node voltage amplitude and phase of balance nodes
Angle, the active power of PV node and node voltage amplitude, the active power of PQ nodes and reactive power, the active power of PI nodes
And Injection Current.System branch parameter list includes branch road number, first node, end-node, branch resistance, branch road reactance.New energy is joined
Number table includes grid-connected node number, power supply capacity, new energy type.
Step 2, by new energy it is equivalent included into different types of node asynchronous wind driven generator is equivalent into PQ nodes, will
It is equivalent into PI nodes by the new energy of current control grid-connected inverters, new energy of grid-connected inverters etc. will be controlled by voltage
Imitate into PV node.
Step 3, PI nodes are converted into PQ nodes, computation model is, whereinForkThe voltage magnitude of the PI nodes of secondary iteration, PQ nodes are converted into by PV node, and computation model is, whereinFor the node reactance of PV node,ForkThe reality of the PV node voltage of secondary iteration
Portion and the difference of given voltage.
Step 4, using improving Forward and backward substitution method calculate node voltage, computation model is
, wherein,ForThe matrix of rank,ZForIt is the impedance perunit value of every section of branch road on the matrix of rank, matrix leading diagonal, its
His position is all 0,CForThe incidence matrix of the branch current of rank.
If the voltage difference maximum of the adjacent iteration twice of step 5, all nodes meets certain precision, calculate and terminate, it is defeated
Go out result, otherwise, continue to iterate to calculate.
To sum up, a kind of distribution power system load flow calculation method containing new-energy grid-connected that the present invention is provided, can be calculated containing new energy
The grid-connected distribution network voltage distribution in source, grasps its operation characteristic and variation tendency, so as to analyze after new-energy grid-connected to power distribution network
Influence, improves calculating speed and precision, it is ensured that the safety and reliability of Operation of Electric Systems.
Claims (8)
1. a kind of distribution power system load flow calculation method containing new-energy grid-connected, it is characterised in that comprise the following steps：
1）Initial data is obtained from system node parameter list, branch parameters table and new energy parameter list；
2）By new energy type by step 1）Acquired initial data is equivalent into different types of node；
3）By step 2）In PV types and PI type new energy be converted into manageable PQ types new energy；
4）Correct step 2）In each node active power and reactive power；
5）Using improved Forward and backward substitution method calculation procedure 2）In each node voltage；
If the voltage difference maximum of the adjacent iteration twice of all nodes meets certain precision, calculate and terminate, output result is no
Then, continue to iterate to calculate.
2. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
1）Described in system node parameter list include power distribution network nodes, the node voltage amplitude of balance nodes and phase angle, PV node
Active power and node voltage amplitude, the active power of PQ nodes and reactive power, the active power of PI nodes and Injection Current.
3. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
1）Described in system branch parameter list include branch road number, first node, end-node, branch resistance and branch road reactance.
4. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
1）Described in new energy parameter list include grid-connected node number, power supply capacity and new energy type.
5. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
2）Described in new energy type include asynchronous wind driven generator, it is the photovoltaic generating system by current control grid-connected inverters, micro-
The new energy such as type gas turbine, fuel cell and wind-driven generator, the solar photovoltaic that grid-connected inverters are controlled by voltage
Pond etc..
6. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
2）It is middle that new energy is equivalent into different types of node including asynchronous wind driven generator is equivalent into PQ nodes, electric current will be passed through
Control the new energy of grid-connected inverters equivalent into PI nodes, the new energy that grid-connected inverters are controlled by voltage is equivalent into PV sections
Point.
7. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
3) computation model that PI nodes are converted into PQ nodes in is, wherein,ForkThe PI sections of secondary iteration
The voltage magnitude of point,For the constant active power value of PI nodes,For the constant injected value of current of PI nodes；PV node is turned
The computation model for changing PQ nodes into is, wherein, it is the node reactance of PV node,ForkIt is secondary
The real part and the difference of given voltage of the PV node voltage of iteration,For the constant active power value of PV node,For PV node
Constant node voltage value,ForkIt is secondary to iterate to calculate the node reactive power value drawn.
8. a kind of distribution power system load flow calculation method containing new-energy grid-connected according to claim 1, it is characterised in that：Step
5）Described in improved Forward and backward substitution method computation model be, wherein,For rank
Matrix,ZForIt is the impedance perunit value of every section of branch road on the matrix of rank, matrix leading diagonal, other positions are all 0,CFor rank
Branch current incidence matrix,For the injecting power of node,It isk-1It is secondary to iterate to calculate the node voltage value drawn.
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Cited By (3)
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| CN110323751A (en) * | 2019-06-26 | 2019-10-11 | 江苏大学 | A kind of weak looped distribution network tidal current computing method containing distributed generation resource |
| CN110988594A (en) * | 2019-12-06 | 2020-04-10 | 国网上海市电力公司 | Power distribution network fault position determining method and determining device |
| CN111478362A (en) * | 2020-04-10 | 2020-07-31 | 国网河北省电力有限公司培训中心 | Integrated simulation method and system for photovoltaic power station and power grid and storage medium |
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Cited By (4)
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|---|---|---|---|---|
| CN110323751A (en) * | 2019-06-26 | 2019-10-11 | 江苏大学 | A kind of weak looped distribution network tidal current computing method containing distributed generation resource |
| CN110988594A (en) * | 2019-12-06 | 2020-04-10 | 国网上海市电力公司 | Power distribution network fault position determining method and determining device |
| CN111478362A (en) * | 2020-04-10 | 2020-07-31 | 国网河北省电力有限公司培训中心 | Integrated simulation method and system for photovoltaic power station and power grid and storage medium |
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