CN110365021A - Ring-containing distribution network load flow calculation method - Google Patents
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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
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Abstract
The application provides a load flow calculation method for a distribution network with a ring, which is characterized in that a load model in a series connection form of a voltage source and an impedance is established, and a mathematical model of a line is established to form an original network model. The establishment of the original network model provides a basis for successively completing the power flow distribution of the distribution network with the ring through kirchhoff current law. The method for calculating the power flow of the distribution network with the ring comprises the steps of solving the node voltage value of each loop turning node through star network transformation, and obtaining the power flow distribution of the whole distribution network with the ring by using the node voltage value of each loop turning node. The method and the device adopt a combination mode of the constant impedance model and the constant current model, and improve the accuracy of the power flow calculation of the distribution network with the loop.
Description
Technical field
This application involves power information fields, more particularly to a kind of tidal current computing method of distribution containing ring.
Background technique
Distribution network voltage grade is lower compared with for power transmission network, directly distributes power to user, according to " closed loop design, open loop operation "
Principle design and use, so operate normally when there are part interconnection switch be in opening and closing state.With the development of society
The raising that electrical equipment requires power supply reliability, a possibility that containing inscription of loop, are gradually increased.In Distribution Networks Reconfiguration, in order to
The influence to user is reduced, needs to change the method for operation using the strategy of " open loop after first closed loop " to reach the mesh of optimal control
, it may appear that the case where of short duration weakly loops are run.Thus, the necessity and significance of weak looped distribution network Load flow calculation are increasingly
It has highlighted and has come out.
Load flow calculation be most widely used in electric system, most basic and most important electrical calculating.Load flow calculation
Task is to calculate the tidal current analysis of whole network according to given network structure and service condition.Load flow calculation as a result, no matter
It is the analysis and research for the existing system method of operation, or compare the analysis of planning stage design scheme, being all must can not
Few.Power system steady stability calculates, multilayer output feedback network is also required to the result using Load flow calculation.
The method of the traditional Load flow calculation of distribution containing ring application has current compensational method, improved Newton-Raphson approach, these
Method needs to realize by iteration, so calculated performance is limited by constringency performance.Load is considered as constant function by conventional method simultaneously
Rate model, when compared with multinode occur variation it is larger when, the accuracy of the Load flow calculation of distribution containing ring is difficult to ensure.
Summary of the invention
Based on this, it is necessary to for the low problem of accuracy of traditional Load flow calculation of distribution containing ring, provide one kind and match containing ring
Net tidal current computing method.
A kind of tidal current computing method of distribution containing ring, comprising:
S10 establishes the load model of voltage source Yu impedance cascade according to the load power data in distribution containing ring,
And the mathematical model of route is established according to the length of route in the distribution containing ring and unit impedance, the load model and described
The mathematical model of route constitutes original looped network model；
S20 chooses multiple loop turnover nodes from the original looped network model, and will be described original by StarNet's transformation
Looped network model conversion is the second equivalent looped network model, each loop turnover node connection one in the second equivalent looped network model
Branch；
S30 obtains each of second equivalent looped network model loop turnover section using Kirchhoff's current law (KCL)
The node voltage value of point；
S40 obtains the trend of the entire distribution containing ring using the node voltage value of each described loop turnover node
Distribution.
The specific steps packet of the load model for establishing voltage source and impedance cascade in one of the embodiments,
It includes:
According to the power of load, sets constant current component and constant-impedance component active power accounting is respectively apAnd aq, idle
Power accounting is respectively bpAnd bq, and then establish the load model of the current source form in parallel with impedance；
The current source form in parallel with impedance is established into load model and is converted to voltage source and impedance cascade
Load model.
The load model of the current source form in parallel with impedance in one of the embodiments, are as follows:
Wherein, RLComponent parameters are hindered for the transverse electric in the load model；XLFor the horizontal reactive component in the load model
Parameter；ILxFor component of the transverse electric flow component in x-axis in the load model；ILyFor the transverse electric stream in the load model
The component of component on the y axis；δ is the phase angle of voltage.
The S20 in one of the embodiments, chooses multiple loop turnover nodes from the original looped network model,
And being converted by StarNet by the original looped network model conversion is the second equivalent looped network model, in the second equivalent looped network model
Each loop turnover node connect a branch the step of include:
Multiple loop turnover nodes are chosen from the original looped network model；
The branch that other loop nodes connect in addition to the loop transfers node in the original looped network model is carried out
StarNet's transformation, and then obtain the first equivalent looped network model；
The branch connecting with the loop turnover node of each in the described first equivalent looped network model is gone here and there respectively
Parallel equivalent, and then obtain the second equivalent looped network model.
In one of the embodiments, when the quantity of loop turnover node is four, kirchhoff electric current is utilized
Law obtains four KCL equations, obtains each of second equivalent looped network model ring according to four KCL equations
The node voltage of road turnover node.
The S40 in one of the embodiments, is obtained using the node voltage value of each described loop turnover node
The specific steps of the entire trend distribution of the distribution containing ring include:
The original looped network model is disconnected from each loop turnover node, forms multiple networks to be solved；
Using the node voltage value of each described loop turnover node, by the gap of each network to be solved
It is equivalent to connect a voltage source；
Using Ohm's law, the electric current of each branch in each network to be solved is solved.
The mathematical modulo of route is established in the length of route and unit impedance in distribution containing ring described in one of the embodiments,
Type are as follows:
Zl=l × (r0+jx0)
Wherein, ZlFor the total impedance of one section of route；L is the length of one section of route；r0+jx0For the resistance of the route of unit length
It is anti-.
The tidal current computing method of distribution containing ring is used for single-phase Load flow calculation or Three-phase Power Flow in one of the embodiments,
It calculates.
A kind of computer equipment, the meter run on a memory and on a processor including memory, processor and storage
The step of calculation machine program, the processor realizes any one of above-described embodiment the method when executing the computer program.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
The step of any one of above-described embodiment the method is realized when row.
The above-mentioned tidal current computing method of distribution containing ring, establishes the load model of voltage source Yu impedance cascade, and establish line
The mathematical model on road constitutes primitive network model.The primitive network model is established as through Kirchhoff's current law (KCL) gradually
The trend distribution for completing the distribution containing ring provides basis.The tidal current computing method of distribution containing ring is converted and is asked by StarNet
The node voltage value of each loop turnover node is solved, and using the node voltage value of each loop turnover node, is obtained
Obtain the trend distribution of the entirely distribution containing ring.The application uses the combination of constant-impedance model and constant current model, improves
To the accuracy of distribution containing ring Load flow calculation.
Detailed description of the invention
Fig. 1 is one kind tidal current computing method flow chart of distribution containing ring that the application one embodiment provides；
Fig. 2 is a kind of illustraton of model for distribution containing ring that the application one embodiment provides；
Fig. 3 is a kind of original looped network illustraton of model that the application one embodiment provides；
Fig. 4 is the equivalent looped network illustraton of model of one kind first that the application one embodiment provides；
Fig. 5 is the equivalent looped network illustraton of model of one kind second that the application one embodiment provides.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1, the application provides a kind of tidal current computing method of distribution containing ring.The tidal current computing method of distribution containing ring
Include:
S10 establishes the load model of voltage source Yu impedance cascade according to the load power data in distribution containing ring,
And the mathematical model of route is established according to the length of route in the distribution containing ring and unit impedance, the load model and described
The mathematical model of route constitutes original looped network model.In step S10, the distribution containing ring includes route and connects on the line
Load.A portion route and load may be constructed looped network, and another part route and load are and the node in the looped network
The branch of connection.A kind of illustraton of model for distribution containing ring that the application one embodiment provides, as shown in Figure 2.Detection can be passed through
Equipment obtains load power and load voltage in the distribution containing ring in real time.By the conversion of model, described ring can will be contained
Each load regards a voltage source as in distribution and an impedance is connected on online.And electric current is in the distribution containing ring
In route on have pressure drop, in order to calculate the pressure drop can by line equivalent be impedance.
S20 chooses multiple loop turnover nodes from the original looped network model, and will be described original by StarNet's transformation
Looped network model conversion is the second equivalent looped network model, each loop turnover node connection one in the second equivalent looped network model
Branch.In step S20, the original looped network model may include a loop and connect branch with the node in the loop
Road, since the loop can have many nodes, and the node on a loop can have many branches, be difficult to pass through at this time
Kirchhoff's current law (KCL) obtains the trend distribution of the entire distribution containing ring.It therefore, can be first from numerous sections of the loop
Several as loop turnover node, the branch transposing that then will be connect with remaining loop node using StarNet's transformation is chosen in point
To loop turnover node.Then it is connect again by the equivalent node that will transfer with loop described in each in series and parallel a plurality of
Branch equivalency transform is a branch, to form the second equivalent looped network model.
S30 obtains each of second equivalent looped network model loop turnover section using Kirchhoff's current law (KCL)
The node voltage value of point.In step S30, by being write to each loop turnover node column in the described second equivalent looped network model
KCL equation simultaneously solves, and can obtain the node voltage value of each loop turnover node.
S40 obtains the trend of the entire distribution containing ring using the node voltage value of each described loop turnover node
Distribution.In step S40, each loop turnover node equivalent is by the voltage value for the node that can transfer according to each loop
One voltage source unlocks network, and then can be obtained entire described match containing ring by common circuit solving process (such as Ohm's law)
The trend of net is distributed.The tidal current computing method of distribution containing ring is used for single-phase Load flow calculation or three in one of the embodiments,
Phase Load flow calculation.
The above-mentioned tidal current computing method of distribution containing ring, establishes the load model of voltage source Yu impedance cascade, and establish line
The mathematical model on road constitutes primitive network model.The primitive network model is established as through Kirchhoff's current law (KCL) gradually
The trend distribution for completing the distribution containing ring provides basis.The tidal current computing method of distribution containing ring is converted and is asked by StarNet
The node voltage value of each loop turnover node is solved, and using the node voltage value of each loop turnover node, is obtained
Obtain the trend distribution of the entirely distribution containing ring.The application uses the combination of constant-impedance model and constant current model, improves
To the accuracy of distribution containing ring Load flow calculation.Also, method provided by the present application is not needed by being arranged and solving iteration amount
Both it can realize the flow state of looped network, the entire distribution containing ring can accurately only be obtained by accurate modeling and the principle of equal effects
Trend distribution, method is simple, convenient.
The specific steps packet of the load model for establishing voltage source and impedance cascade in one of the embodiments,
Include the power (P according to loadL+jQL), setting constant current component and constant-impedance component active power accounting are respectively apAnd aq, nothing
Function power accounting is respectively bpAnd bq, and then establish the load model of the current source form in parallel with impedance.By the current source
(IL) and impedance (ZL) form in parallel establishes the load model that load model is converted to voltage source Yu impedance cascade.Wherein
Load model is expressed as follows with per unit value form:
Wherein, V is the voltage value (definite value) of load.
The load model of the current source form in parallel with impedance are as follows:
Wherein, IL=ILx+jILy；ZL=RL+XL；RLComponent parameters are hindered for the transverse electric in the load model；XLIt is described
The anti-component parameters of transverse electric in load model；ILxFor component of the transverse electric flow component in x-axis in the load model；ILyFor
The component of transverse electric flow component on the y axis in the load model；δ is the phase angle of voltage.
By the current source (IL) and impedance (ZL) form in parallel establishes load model and be converted to voltage source and connect with impedance
The load model of form are as follows:
UL=-IL×ZLFormula (3)
The S20 in one of the embodiments, chooses multiple loop turnover nodes from the original looped network model,
And being converted by StarNet by the original looped network model conversion is the second equivalent looped network model, in the second equivalent looped network model
Each loop turnover node connect a branch the step of include:
Multiple loop turnover nodes are chosen from the original looped network model.To in the original looped network model remove the ring
The branch that other loop nodes connect other than road turnover node carries out StarNet's transformation, and then obtains the first equivalent looped network model.Point
It is other series-parallel equivalent to the branch progress being connect with the loop turnover node of each in the described first equivalent looped network model, into
And obtain the described second equivalent looped network model.For example, Fig. 3 and Fig. 4 are referred to, the loop node in the original looped network model
Quantity is 5 (respectively node 2, node 3, node 4, node 5 and nodes 6), chooses 4 loop node (respectively nodes
2, node 4, node 5 and node 6) branch connecting with node 3 is moved after StarNet converts as loop turnover node
It is connected to node 2 and node 4.It is as shown in Figure 4 through the equivalent looped network model of StarNet transformed first.After equivalent obtained through series-parallel
The equivalent looped network model of as shown in Figure 5 second.
In one of the embodiments, when the quantity of loop turnover node is four, kirchhoff electric current is utilized
Law obtains four KCL equations, obtains each of second equivalent looped network model ring according to four KCL equations
The node voltage of road turnover node.For example, can be by following four KCL equations to the second equivalent looped network mould as shown in Figure 5
The node voltage of loop turnover node in type is solved respectively:
WhereinThe respectively node voltage of node 2, node 4, node 5, node 6.
The S40 in one of the embodiments, is obtained using the node voltage value of each described loop turnover node
The specific steps of the entire trend distribution of the distribution containing ring include:
The original looped network model is disconnected from each loop turnover node, forms multiple networks to be solved.Benefit
With the node voltage value of each described loop turnover node, one is connect by the gap of each network to be solved is equivalent
Voltage source.Using Ohm's law, the electric current of each branch in each network to be solved is solved.Below to partial branch type into
Row solution procedure explanation:
(1) it such as the subnetwork that Fig. 2 interior joint 5,9 forms, utilizesWith(Fig. 5), it is true according to the following formula
Determine trend:
(2) subnetwork that node 3,8 forms as shown in figure 1, wherein 2,4 connect voltage source respectivelyBy by 2-3 with
3-4 branch circuit parallel connection is equivalent, rear to can determineWithAfter utilizeIt can determine That is:
The mathematical modulo of route is established in the length of route and unit impedance in distribution containing ring described in one of the embodiments,
Type are as follows:
Zl=l × (r0+jx0) formula (4)
Wherein, ZlFor the total impedance of one section of route；L is the length of one section of route；r0+jx0For the resistance of the route of unit length
It is anti-.
A kind of computer equipment, the meter run on a memory and on a processor including memory, processor and storage
The step of calculation machine program, the processor realizes any one of above-described embodiment the method when executing the computer program.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
The step of any one of above-described embodiment the method is realized when row.
Those of ordinary skill in the art will appreciate that realizing the whole in above-described embodiment distribution containing ring tidal current computing method
Or part process, it is that relevant hardware can be instructed to complete by computer program, the computer program can store
In a non-volatile computer read/write memory medium, the computer program is when being executed, it may include such as above-mentioned each method
The process of embodiment.Wherein, to memory, storage, database or other used in each embodiment provided herein
Any reference of medium, may each comprise non-volatile and/or volatile memory.Nonvolatile memory may include read-only storage
Device (ROM), programming ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Easily
The property lost memory may include random access memory (RAM) or external cache.By way of illustration and not limitation,
RAM is available in many forms, such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate (DDR)
SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory are total
Line (Rambus) directly RAM (RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram
(RDRAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of tidal current computing method of distribution containing ring characterized by comprising
S10 establishes the load model of voltage source Yu impedance cascade, and root according to the load power data in distribution containing ring
The mathematical model of route, the load model and the route are established according to the length and unit impedance of route in the distribution containing ring
Mathematical model constitute original looped network model；
S20 chooses multiple loop turnover nodes from the original looped network model, and is converted by StarNet by the original looped network
Model conversion is the second equivalent looped network model, each loop turnover node connects a branch in the second equivalent looped network model
Road；
S30 obtains each of second equivalent looped network model loop turnover node using Kirchhoff's current law (KCL)
Node voltage value；
S40 obtains the trend point of the entire distribution containing ring using the node voltage value of each described loop turnover node
Cloth.
2. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that described to establish voltage source and impedance
The specific steps of the load model of cascade include:
According to the power of load, sets constant current component and constant-impedance component active power accounting is respectively apAnd aq, reactive power
Accounting is respectively bpAnd bq, and then establish the load model of the current source form in parallel with impedance；
The current source form in parallel with impedance is established into the load that load model is converted to voltage source Yu impedance cascade
Model.
3. the tidal current computing method of distribution containing ring according to claim 2, which is characterized in that the current source is in parallel with impedance
Form load model are as follows:
Wherein, RLComponent parameters are hindered for the transverse electric in the load model；XLFor the horizontal reactive component ginseng in the load model
Number；ILxFor component of the transverse electric flow component in x-axis in the load model；ILyFor the transverse electric flow point in the load model
The component of amount on the y axis；δ is the phase angle of voltage.
4. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that the S20, from the original ring
Multiple loop turnover nodes are chosen in pessimistic concurrency control, and are the second equivalent ring by the original looped network model conversion by StarNet's transformation
The step of pessimistic concurrency control, each loop turnover node connects a branch in the second equivalent looped network model includes:
Multiple loop turnover nodes are chosen from the original looped network model；
StarNet is carried out to the branch that other loop nodes connect in addition to the loop transfers node in the original looped network model
Transformation, and then obtain the first equivalent looped network model；
The branch connecting with the loop turnover node of each in the described first equivalent looped network model is carried out respectively series-parallel
It is equivalent, and then obtain the second equivalent looped network model.
5. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that when loop turnover node
When quantity is four, using Kirchhoff's current law (KCL), four KCL equations are obtained, according to four KCL equations acquisitions
The node voltage of each of second equivalent looped network model loop turnover node.
6. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that the S40, using described each
The node voltage value of a loop turnover node, the specific steps for obtaining the trend distribution of the entire distribution containing ring include:
The original looped network model is disconnected from each loop turnover node, forms multiple networks to be solved；
It is using the node voltage value of each described loop turnover node, the gap of each network to be solved is equivalent
Connect a voltage source；
Using Ohm's law, the electric current of each branch in each network to be solved is solved.
7. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that route in the distribution containing ring
The mathematical model of route is established in length and unit impedance are as follows:
Zl=l × (r0+jx0)
Wherein, ZlFor the total impedance of one section of route；L is the length of one section of route；r0+jx0For the impedance of the route of unit length.
8. the tidal current computing method of distribution containing ring according to claim 1, which is characterized in that the Load flow calculation of distribution containing ring
Method is used for single-phase Load flow calculation or three-phase power flow.
9. a kind of computer equipment, the calculating run on a memory and on a processor including memory, processor and storage
Machine program, which is characterized in that the processor is realized described in any one of claims 1 to 8 when executing the computer program
The step of method.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of any one of claims 1 to 8 the method is realized when being executed by processor.
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| CN113964839A (en) * | 2021-10-19 | 2022-01-21 | 广东电网有限责任公司 | Looped network power flow adjusting method, device, equipment and medium based on phase-shifting transformer |
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