CN110401188A - A kind of appraisal procedure and assessment device of distributed power distribution network power supply capacity - Google Patents
A kind of appraisal procedure and assessment device of distributed power distribution network power supply capacity Download PDFInfo
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- CN110401188A CN110401188A CN201910658166.5A CN201910658166A CN110401188A CN 110401188 A CN110401188 A CN 110401188A CN 201910658166 A CN201910658166 A CN 201910658166A CN 110401188 A CN110401188 A CN 110401188A
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- distribution network
- power distribution
- computing module
- supply capacity
- power supply
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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
Abstract
The present invention is suitable for power distribution network evaluation areas, disclose the appraisal procedure and assessment device of a kind of distributed power distribution network power supply capacity, the appraisal procedure includes: to construct a kind of three-phase imbalance power distribution network power supply capacity model comprising distributed energy, calculate the maximum supply load of power distribution network, and comprehensive analysis node voltage, transformer capacity, Branch Power Flow, take the relationship between Continuation Method analysis power distribution network net capability and voltage and reactive power.The assessment device has the functional module for realizing the appraisal procedure.The present invention is able to solve the problem of influence that the distributed energy that do not probe into the prior art generates power distribution network net capability.
Description
Technical field
The present invention relates to power distribution network evaluation areas, especially a kind of appraisal procedure of distributed power distribution network power supply capacity
And assessment device.
Background technique
Power distribution network is the important channel for realizing electric energy transmission between terminal user and power transmission network, it is ensured that user can be from transmission of electricity
High-quality electric energy service is obtained in net.It can be seen that the actual motion mode and its network topology structure in conjunction with power distribution network calculate
The power supply performance of power distribution network is obtained, this plays key effect to raising power distribution network runnability and its control efficiency.For matching
Mainly from power transmission network institute, attainable ability to transmit electricity level is analyzed when the power supply capacity of power grid is evaluated, according to distribution
The actual motion state of net realizes the simulation process to power distribution network node load growth pattern, thus verifies the node of power distribution network
All kinds of constraint conditions such as voltage and Branch Power Flow obtain the supply load upper limit of power distribution network on this basis.Currently, power distribution network
The electric car of middle access, distributed generation resource, flexible load quantity just quickly increase, its three-phase energy imbalance is caused to become more
Add obviously, but only analyzes the pass between power distribution network net capability and power distribution network three-phase imbalance feature in the prior art
System, and there is no carry out assessment effectively and reasonably to the influence that power distribution network net capability generates to distributed energy.
Summary of the invention
A kind of distributed power distribution network power supply capacity is provided it is an object of the invention to solve above-mentioned technical problem
Appraisal procedure and assessment device, to solve in the prior art, there is no effectively and reasonably assessment distributed energies to power distribution network maximum
The problem of influence that power supply capacity generates.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of appraisal procedure of distributed power distribution network power supply capacity, comprising the following steps:
S1, distribution power flow operation data is obtained；
S2, the initial continuous parameter of setting, step-length and load increase, and calculate trend initial point；
S3, judge whether material calculation meets required precision, if satisfied, then terminate algorithm, end of output, if not satisfied,
Then enter step S4；
S4, the calculating that prediction process is carried out to trend operation data, wherein selecting tangent line predicted method to calculate tangent vector:
Wherein, θ represents voltage phase angle, and λ indicates that load parameter, V represent voltage magnitude, and e is row vector, and f represents conventional tide
Flow equation,Respectively indicate conventional Load Flow equation to voltage phase angle, load parameter, voltage magnitude local derviation, d
θ, d λ, dV are variable quantity within a certain period of time；
Solution obtain out tangent vector and then voltage phase angle under the next operating status (i+1) of prediction, voltage magnitude,
The parameter of load parameter:
Wherein, σ represents the step-length of every step；
S5, operating status point is corrected, judges whether each operating status point has out-of-limit generation, if without out-of-limit generation,
Step S4 is then returned to, if there is out-of-limit generation, step-length is halved and returns to step S3.
A kind of assessment device of distributed power distribution network power supply capacity, including obtain module, the first computing module, second
Computing module and third computing module；Wherein,
Module is obtained, for obtaining distribution power flow operation data；
First computing module, for judging whether material calculation meets required precision, according to judging result, output calculates knot
Fruit enters the second computing module；
Second computing module, the prediction process for distribution power flow operation data；
Third computing module according to judging result and returns to the first calculating for judging whether trend operation data is out-of-limit
Module or the second computing module.
The beneficial effects of the present invention are: being powered using Continuation power flow to the power distribution network of three-phase imbalance containing distributed energy
Ability is evaluated, and on the basis of existing operating point, is changed process to the controlled distribution formula energy and load power and is carried out mould
It is quasi-, while the power distribution network parameters variable that Load flow calculation obtains is verified, analyze the phenomenon for having unconfined condition out-of-limit.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is that the implementation process of the appraisal procedure of distributed power distribution network power supply capacity provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is the exemplary diagram of the assessment device of distributed power distribution network power supply capacity provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of terminal device provided in an embodiment of the present invention；
Fig. 4 is IEEE33 node power distribution net system model figure provided in an embodiment of the present invention；
Fig. 5 is the three-phase PV curve graph of DG1 access node provided in an embodiment of the present invention；
Fig. 6 is the three-phase PV curve graph that different type DG provided in an embodiment of the present invention accesses posterior nodal point.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Fig. 1 is that the implementation process of the appraisal procedure of distributed power distribution network power supply capacity provided in an embodiment of the present invention is shown
It is intended to, as shown in Figure 1, a kind of appraisal procedure of distributed power distribution network power supply capacity, comprising the following steps:
S1, distribution power flow operation data is obtained；
S2, the initial continuous parameter of setting, step-length and load increase, and calculate trend initial point；
S3, judge whether material calculation meets required precision, if satisfied, then terminate algorithm, end of output, if not satisfied,
Then enter step S4；
S4, the calculating that prediction process is carried out to trend operation data, wherein selecting tangent line predicted method to calculate tangent vector:
Wherein, θ represents voltage phase angle, and λ indicates that load parameter, V represent voltage magnitude, and e is row vector, and f represents conventional tide
Flow equation,Respectively indicate conventional Load Flow equation to voltage phase angle, load parameter, voltage magnitude local derviation, d
θ, d λ, dV are variable quantity within a certain period of time；
Solution obtain out tangent vector and then voltage phase angle under the next operating status (i+1) of prediction, voltage magnitude,
The parameter of load parameter:
Wherein, σ represents the step-length of every step；
S5, operating status point is corrected, judges whether each operating status point has out-of-limit generation, if without out-of-limit generation,
Step S4 is then returned to, if there is out-of-limit generation, step-length is halved and returns to step S3.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
Obtain the analysis before a kind of appraisal procedure of distributed power distribution network power supply capacity and data prediction:
1, parameterize equation: the mode of selection local geometric parametrization, using Voltage Drop reach most serious mutually in terms of
Parameter is calculated, building obtains linear equation, prevents occurring the unusual phenomenon of Jacobian matrix in collapse of voltage, formula is as follows:
In formula, dViFor the element in the β phase voltage tangent vector of node i.
2, it predicts process: first being solved when prediction and obtain approximate solution, and as the initial value of correction iterative process.Consider
Have readily identified critical point to tangent line prediction technique and calculate easy advantage, therefore tangent line predicted method is selected to cut to calculate
Vector.The mode of variable step is selected to complete the process of progressive alternate, original step is kept in the case where constraint condition is not out-of-limit
Long iteration then carries out step-length before to halve processing, is decreased to step-length to meet precision in this way when occurring more to prescribe a time limit
Until condition.
3, it solution procedure: obtains distributed power distribution network power supply capacity evaluation index, is solved with Continuation Method
The obtained power distribution network power supply capacity analysis process of three-phase imbalance containing distributed energy.
Fig. 2 shows the examples of the assessment device of distributed power distribution network power supply capacity provided in an embodiment of the present invention
Figure.As shown in Fig. 2, the assessment device may include: to obtain module 401, the first computing module 402,403 and of the second computing module
Third computing module 404.
Module 401 is obtained, for obtaining distribution power flow operation data；
First computing module 402, for judging whether step-length meets required precision, according to judging result, output calculates knot
Fruit enters the second computing module；
Second computing module 403, the prediction process for distribution power flow operation data.
Third computing module 404 according to judging result and returns to the first meter for judging whether trend operation data is out-of-limit
Calculate module 402 or the second computing module 403.
Fig. 3 is the schematic diagram for the terminal device that one embodiment of the invention provides.As shown in figure 3, the terminal of the embodiment is set
Standby 500 include: processor 501, memory 502 and are stored in the memory 502 and can transport on the processor 501
Capable computer program 503, such as the appraisal procedure of distributed power distribution network power supply capacity.The processor 501 executes institute
It can be realized the appraisal procedure of above-mentioned distributed power distribution network power supply capacity when stating computer program 503.
Illustratively, the computer program 503 can be divided into one or more program modules, it is one or
Multiple program modules are stored in the memory 502, and are executed by the processor 501, to complete the present invention.Described one
A or multiple program modules can be the series of computation machine program instruction section that can complete specific function, and the instruction segment is for retouching
The computer program 503 is stated in the appraisal procedure device or terminal device of the distributed power distribution network power supply capacity
Implementation procedure in 500.For example, the computer program 503, which can be divided into, obtains module 401, the first computing module
402, the second computing module 403 and third computing module 404, each module concrete function please refer to the corresponding embodiment of Fig. 2, herein
No longer repeat one by one.
The terminal device 500 can be the calculating such as desktop PC, notebook, palm PC and cloud server and set
It is standby.The terminal device may include, but be not limited only to, processor 501, memory 502.It will be understood by those skilled in the art that
Fig. 3 is only the example of terminal device 500, does not constitute the restriction to terminal device 500, may include more or more than illustrating
Few component perhaps combines certain components or different components, such as the terminal device can also be set including input and output
Standby, network access equipment, bus etc..
Alleged processor 501 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
The memory 502 can be the internal storage unit of the terminal device 500, such as terminal device 500 is hard
Disk or memory.The memory 502 is also possible to the External memory equipment of the terminal device 500, such as the terminal device
The plug-in type hard disk being equipped on 500, intelligent memory card (Smart Media Card, SMC), secure digital (Secure
Digital, SD) card, flash card (Flash Card) etc..Further, the memory 502 can also both include the terminal
The internal storage unit of equipment 500 also includes External memory equipment.The memory 502 for store the computer program with
And other programs and data needed for the terminal device 500.The memory 502 can be also used for temporarily storing defeated
Out or the data that will export.
Sample calculation analysis:
As shown in figure 4, carrying out emulation testing using revised IEEE33 Node power distribution system to verify this model and ask
The validity of solution mode, while it being sequentially ingressed into distributed generation resource for each node, as a result see Fig. 5.Set the voltage of the distribution system
A reference value is equal to 12.00kV, while its power reference value is equal to 10MW.3 distributed generation resources (DG) have been accessed in total, and will be real
Border on-position and its every and network parameters are listed in Table 1 below.
1 on-position DG of table and and network parameters
| Number | Triphase parameter/p.u. |
| DG1 | P=0.05, V=1, Imax=1.15 |
| DG2 | P=0.05, Q=0.02, Imax=0.25 |
| DG3 | P=0.05, V=1, Imax=0.75 |
In the case where DG1 is only connected with No. 10 nodes of power distribution network, it is assumed that No. 10 nodes are according to constant at this time
Power factor carries out load growth, and remaining each node keeps stable load condition.It is reached in distributed generation resource maximum active
When power output, newly-increased power is undertaken by No. 0 balance nodes.The corresponding three-phase PV of No. 10 nodes as can see from Figure 5
Change curve.
Fig. 5 is analyzed it can be found that distribution network load parameter at this time becomes after accessing DG in power distribution network
1.12, the increase for the maximum supply load that can be realized.Simultaneously it is also found that after the idle injection of DG lasting rising, No. 10
The out-of-limit phenomenon of constraint of node voltage has occurred in the B phase of node.
The net capability situation of change for studying system in the case where accessing 3 DG simultaneously in power distribution network, should be noted
DG2 and DG3 belongs to controllable DG, while meeting QGi=0.5QGi.It is connect using No. 10 nodes as above-mentioned each DG with power distribution network
Node set, and 3 DG is kept to increase active power output with equal proportion, obtains No. 10 node three-phase PV shown in fig. 6 variation
Curve.
According to Fig. 5 from the test result of Fig. 6 it is found that after accessing all kinds of different DG in power distribution network, obtained distribution
Net load parameter is 1.25, and the maximum supply load that can reach increases to 32.52MW from initial 25.20MW.May be used also simultaneously
With discovery, after the idle injection of DG is lasting to be risen, the phenomenon that node voltage is beyond constraint has occurred in C phase.In fixed distribution
It, can be by way of exporting active and reactive power after all kinds of different DG are connected with power distribution network under the conditions of net active power
Effectively reducing line power fluctuation is obviously improved three-phase imbalance power distribution network to preferably support power distribution network node voltage
Maximum supply load.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing
The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list
Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system
The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with
It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of logical function partition, there may be another division manner in actual implementation, such as
Multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, device
Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or
In use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned implementation
All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program
Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on
The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation
Code can be source code form, object identification code form, executable file or certain intermediate forms etc..The computer-readable medium
It may include: any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic that can carry the computer program code
Dish, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described
The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice
Subtract, such as does not include electric carrier signal and electricity according to legislation and patent practice, computer-readable medium in certain jurisdictions
Believe signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (2)
1. a kind of appraisal procedure of distributed power distribution network power supply capacity, which comprises the following steps:
S1, distribution power flow operation data is obtained；
S2, the initial continuous parameter of setting, step-length and load increase, and calculate trend initial point；
S3, judge whether material calculation meets required precision, if satisfied, then terminate algorithm, end of output, if not satisfied, then into
Enter step S4；
S4, the calculating that prediction process is carried out to trend operation data, wherein selecting tangent line predicted method to calculate tangent vector:
Wherein, θ represents voltage phase angle, and λ indicates that load parameter, V represent voltage magnitude, and e is row vector, and f represents conventional Load Flow side
Journey,Respectively indicate conventional Load Flow equation to voltage phase angle, load parameter, voltage magnitude local derviation, d θ, d
λ, dV are variable quantity within a certain period of time；
Solution obtains out tangent vector and then voltage phase angle, voltage magnitude, load under the next operating status (i+1) of prediction
The parameter of parameter:
Wherein, σ represents the step-length of every step；
S5, operating status point is corrected, judges whether each operating status point has out-of-limit generation, if being returned without out-of-limit generation
To step S4, if there is out-of-limit generation, step-length is halved and returns to step S3.
2. a kind of assessment device of distributed power distribution network power supply capacity, which is characterized in that including obtaining module 401, first
Computing module 402, the second computing module 403 and third computing module 404；Wherein,
Module 401 is obtained, for obtaining distribution power flow operation data；
First computing module 402, for judging whether material calculation meets required precision, according to judging result, output calculates knot
Fruit enters the second computing module 403；
Second computing module 403, the prediction process for distribution power flow operation data；
Third computing module 404 according to judging result and returns to the first calculating mould for judging whether trend operation data is out-of-limit
Block 402 or the second computing module 403.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101404412A (en) * | 2008-11-05 | 2009-04-08 | 中国电力科学研究院 | Method for static electric voltage stability analysis |
| WO2018049737A1 (en) * | 2016-09-18 | 2018-03-22 | 国电南瑞科技股份有限公司 | Safe correction calculation method based on partition load control |
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2019
- 2019-07-20 CN CN201910658166.5A patent/CN110401188A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404412A (en) * | 2008-11-05 | 2009-04-08 | 中国电力科学研究院 | Method for static electric voltage stability analysis |
| WO2018049737A1 (en) * | 2016-09-18 | 2018-03-22 | 国电南瑞科技股份有限公司 | Safe correction calculation method based on partition load control |
Non-Patent Citations (1)
| Title |
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| 黄兵，赵晋泉: "基于连续潮流的配电网供电能力评估", 《电力工程技术》 * |
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Application publication date: 20191101 |