CN108155645A - Closed loop judgment method and device for factory and mine power distribution network - Google Patents
Closed loop judgment method and device for factory and mine power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- H—ELECTRICITY
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- 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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Abstract
The invention provides a loop closing judgment method and a loop closing judgment device for a factory and mine power distribution network, wherein the method comprises the following steps: establishing an external network equivalent model of the closed-loop network according to boundary nodes between the closed-loop network and a superior network; calculating to obtain equivalent impedance of the loop closing network according to the external network equivalent model; calculating the steady-state current and the transient-state current of the loop closing network according to the voltage difference at the two sides of the interconnection switch and the equivalent impedance of the loop closing network; and when the steady-state current and the transient-state current of the loop closing network are determined to be smaller than the relay protection current threshold and the equipment rated through-current threshold, judging that the loop closing of the distribution network is possible. The invention can be generally suitable for loop closing operation of various plant and mine power distribution networks, has accurate judgment, reduces the risk of loop closing operation of plant and mine enterprises, avoids unnecessary power failure and improves the reliability of power supply.
Description
Technical field
The present invention relates to factories and miness field of power distribution, a kind of cyclization judgment method more particularly to factories and miness distribution network and it is
System.
Background technology
In industrial enterprise's distribution system planning, in order to improve power supply reliability, generally supplied using dual power supply or more power supplys
The structure of electricity, it then follows the principle of " closed loop design, open loop operation ".When some busbar, switch or feeder line need to overhaul or occur
During failure, the load of the multiple feed on the busbar, switch or feeder line is just shifted, by operate interconnection switch into
Row Loop Closing Operation, it is possible to reduce power off time improves power supply continuity.Loop Closing Operation refer to ensure do not have a power failure in the case of,
By being closed interconnection switch, the two or more pieces distribution line of same voltage class is converted into cyclic wire connection from radial wiring
Operation.If directly carrying out Loop Closing Operation, since interconnection switch both sides voltage phase difference is larger, feeder line initial load is heavier, leads
Electric current is excessive after causing cyclization, causes trip protection, apparatus overload influences to keep the safety in production.Thus closed before cyclization
Ring judges.
At present in Loop Closing Operation, interconnection switch both sides voltage amplitude value difference is determined generally by voltage transformer, is utilized
Nuclear phase instrument determines voltage phase difference, carries out analysis of experiments further according to voltage phase difference and voltage vector angle, judges whether to close
Ring.Such as there is enterprise to suggest controlling the difference of the voltage effective value of interconnection switch both sides before cyclization within 0.3kV, by voltage phase
Angulation is controlled within 3 degree.The shortcomings that this technology, is the absence of rational closed loop network analysis model and theory deduction no matter
All it is to show that judging result is inaccurate by the method tested in qualitative analysis or quantitative analysis, and the region that is put to the test
It limits, the empirical value that analysis of experiments obtains simultaneously does not have universality, it is impossible to the conjunction applied to other industrial enterprise's distribution networks
Ring operates.
Invention content
An embodiment of the present invention provides a kind of cyclization judgment method of factories and miness distribution network, to promote the standard of cyclization judgement
True property, improves power supply reliability, and this method includes：
The external network Equivalent Model of cyclization network is established according to the boundary node between cyclization network and upper network；
It is calculated according to external network Equivalent Model and obtains cyclization Equivalent Network impedance；
According to the steady-state current of the voltage difference of interconnection switch both sides and cyclization Equivalent Network impedance computation cyclization network and temporarily
State electric current；
Determining that the steady-state current of cyclization network and transient current are specified through-flow less than relay protection current threshold and equipment
During threshold value, judge that distribution network being capable of cyclization.
The embodiment of the present invention additionally provides a kind of cyclization judgment means of factories and miness distribution network, to promote cyclization judgement
Accuracy, improves power supply reliability, which includes：
Model building module, with the outside that cyclization network is established according to the boundary node between cyclization network and upper network
Equivalent Network model；
Equivalent impedance acquisition module obtains cyclization Equivalent Network impedance for being calculated according to external network Equivalent Model；
Current calculation module, for the voltage difference according to interconnection switch both sides and cyclization Equivalent Network impedance computation cyclization net
The steady-state current and transient current of network；
Cyclization judgment module, determine the steady-state current of cyclization network and transient current be less than relay protection current threshold and
During the specified through-flow threshold value of equipment, judge that distribution network being capable of cyclization.
The embodiment of the present invention additionally provides a kind of computer equipment, including memory, processor and storage on a memory
And the computer program that can be run on a processor, the processor realize factories and miness distribution network when performing the computer program
Cyclization judgment method.
The embodiment of the present invention additionally provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is the computer program for the cyclization judgment method for performing factories and miness distribution network.
The cyclization judgment method of factories and miness distribution network provided in an embodiment of the present invention, it is necessary first to establish the outer of cyclization network
Portion's Equivalent Network model obtains external network equivalent impedance, and then obtains cyclization net further according to the voltage difference of interconnection switch both sides
The transient current and steady-state current of network；Finally it is whether to carry out according to the steady-state current of cyclization network and transient current judgement
Loop Closing Operation.Electric current of the cyclization judgment method of factories and miness distribution network based on cyclization network of the embodiment of the present invention judged,
Judging result is accurate, and judgment method has universality, can be adapted for the Loop Closing Operation of various industrial enterprise's distribution networks, reduces
The risks of industrial enterprise's Loop Closing Operations, avoids unnecessary power failure, improves power supply reliability.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.In the accompanying drawings：
Fig. 1 is the flow diagram of the cyclization judgment method of factories and miness distribution network in the embodiment of the present invention；
Fig. 2 is the principle schematic that cyclization judges in the embodiment of the present invention；
Fig. 3 is the division schematic diagram of internal network and external network in the embodiment of the present invention；
Fig. 4 is the schematic diagram of balance nodes in the embodiment of the present invention；
Fig. 5 a, Fig. 5 b are the schematic diagrames that cyclization network steady-state current is asked in the embodiment of the present invention；
Fig. 6 is the equivalent circuit schematic diagram that cyclization network transient current calculates in the embodiment of the present invention；
Fig. 7 is the structure diagram of the cyclization judgment means of factories and miness distribution network in the embodiment of the present invention；
Fig. 8 is the structure diagram of medium value impedance acquisition module of the embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are more clearly understood, below in conjunction with the accompanying drawings to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In enterprise when carrying out Loop Closing Operation, failure the reason of be primarily due to protective relaying device action, make it is a certain into
Line circuit breaker trip, the load of two sections of busbar institute bands of cyclization all lose power supply.And relay protection action is mainly due to closing
Ring operation produces larger Alloy White Iron, causes protection act.This larger Alloy White Iron is causing the same of protection act
When, the overload of main transformer and current－carrying conductor is also frequently accompanied by, it is larger to the menace of system safety.Therefore, inventor thinks
Judging Loop Closing Operation success, it is necessary first to which pairing circular current is calculated, and judging whether further according to Alloy White Iron can
Carry out Loop Closing Operation.
Above-mentioned reason is based on, an embodiment of the present invention provides a kind of cyclization judgment methods of factories and miness distribution network, use
To promote the accuracy of cyclization judgement, power supply reliability is improved, as shown in Figure 1, this method includes：
101：The external network equivalence mould of cyclization network is established according to the boundary node between cyclization network and upper network
Type；
102：It is calculated according to external network Equivalent Model and obtains cyclization Equivalent Network impedance；
103：According to the voltage difference of interconnection switch both sides and the steady-state current of cyclization Equivalent Network impedance computation cyclization network
And transient current；
104：Determining that the steady-state current of cyclization network and transient current are specified less than relay protection current threshold and equipment
During through-flow threshold value, judge that distribution network being capable of cyclization.
It is described to determine the steady-state current of cyclization network and transient current less than relay protection current threshold in one embodiment
When value and the specified through-flow threshold value of equipment, judge distribution network can cyclization, can be there are many embodiment, for example, such as Fig. 2 institutes
Show, can judge that distribution network can be with cyclization when the steady-state current and transient current of cyclization network meet following condition：
I ＞dz＞ Ic；
I≥dz＞ Iim；
ITR.e＞ Ic；
Wherein, I ＞dzThe overcurrent definite value of expression protective relaying device, I >=dzRepresent that the quick-break of protective relaying device is determined
Value, ITR.eThe overload capacity of indication transformer, IcRepresent steady-state current, IimRepresent transient current.
In one embodiment, if as shown in Fig. 2, cannot direct cyclization, the parameter of cyclization network can also be adjusted, until
It can carry out Loop Closing Operation.The parameter for adjusting cyclization network can be there are many embodiment, for example, determining the steady of cyclization network
When state electric current and transient current are not less than relay protection current threshold and equipment specified through-flow threshold value, interconnection switch both sides are adjusted
Voltage difference recalculates the steady-state current and transient current of cyclization network according to the voltage difference after adjusting, until cyclization network
Steady-state current and transient current are less than relay protection current threshold and the specified through-flow threshold value of equipment, judge that distribution network can close
Ring.It after judgement can be with cyclization, can be sent out that cyclization is allowed to instruct.If after adjustment parameter, cyclization is still unable to, then may be used
To send out the instruction for not allowing cyclization.
In one embodiment, according to external network Equivalent Model calculating acquisition cyclization Equivalent Network, impedance can there are many real
When mode, for example, can according to the external network Equivalent Model of cyclization network, calculate obtain external network injecting power；According to
External network injecting power obtains cyclization Equivalent Network impedance.In implementation, since external network is complex, and it may occur
Variation, the electric panel room for performing Loop Closing Operation are difficult the parameter for obtaining external network, for this problem, be may be used improved
Ward equivalent methods carry out equivalence to external network, and specific method is as follows：
As shown in figure 3, for one or two boundary is only existed between industrial enterprise 10kV cyclizations network and upper network
Node, in order to meet the requirement of calculating, we will treat the busbar of cyclization as boundary busbar, and boundary busbar and internal network (are
System) as research system, it is external network other than the busbar of boundary.The connection branch of internal network (system) and boundary busbar into
For interconnection.Subset A represents internal network, and subset B gathers for boundary node (boundary busbar), and subset C is external node set,
The electrical link of the system can be represented with following linear equation：
Wherein, the transadmittance between the self-admittance of each node of Y expressions and node, U represent the voltage of each node, and I represents each section
Point Injection Current, C represent external node, and B represents boundary node, and A represents internal node；
By the node outside above formula cancellation, that is, eliminate UC, following equation can be obtained：
In practical applications, power may be used to replace electric current, equation transform is：
IfIt will be defined as：
Then formula (2) can be write as：
Wherein, EYEQFor external network injecting power；UBVoltage for boundary node；UAVoltage for cyclization network；UCFor
The voltage of external network；SBPower for boundary node；SAPower for cyclization network；SCPower for external network；YBCIt is outer
Transadmittance between portion's network and boundary node；YCCSelf-admittance for external network；
If node voltage is known, external network injecting power is assigned to the injecting power increment on boundary node
ValueFor:
External network injecting power can be calculated by following formula：
Wherein, S1、S2、SRRepresent node injecting power, y1、y2、yRRepresent the admittance of branch, YB12For equivalent network both sides
The admittance value of equivalent branch between node；Seq1、Seq2The injection calculated for two boundary nodes in base state using above formula (5)
Power, SB12The power of equivalent branch, S between equivalent two boundary nodes of Wardt1、St2To measure to obtain the contact for treating cyclization in real time
Linear heat generation rate.
As shown in figure 4, the impedance of cyclization Equivalent Network is seen by cyclization port, power supply point is traced back to by cyclization point, i.e., it is flat
The sum of impedance of weighing apparatus node, R is balance nodes.
B1 and B2 represents two boundary nodes in figure, and the power of balance nodes is：
The voltage of two boundary nodes is respectively U1And U2, can be obtained by ring system measured data, therefore can obtain
Take the voltage U of balance nodesR：
The admittance y of balance nodes is asked for againRWith the admittance y of cyclization branch of a networki：
It is finally calculated according to the following formula and obtains cyclization Equivalent Network impedance Zeq：
Wherein, ZeqFor cyclization Equivalent Network impedance；SiPower for boundary node；y1、y2、yiFor cyclization branch of a network
Admittance；UiVoltage for boundary node.
In one embodiment, since the size of Alloy White Iron and the voltage difference of interconnection switch both sides and cyclization Equivalent Network hinder
It is anti-related, in the voltage difference for measuring interconnection switch both sides, calculate after obtaining cyclization Equivalent Network impedance, can calculate and be closed
The steady-state current and transient current of loop network.Cyclization is calculated according to the voltage difference of interconnection switch both sides and external network equivalent impedance
The steady-state current and transient current of network can be there are many embodiments, for example, can include：
As shown in Fig. 5 a, Fig. 5 b, network can be decomposed into two networks in figure, and one is radial networks (Fig. 5 a), and one
A is loop network (Fig. 5 b), and the network that the two boundary are formed, boundary can be calculated, by the result superposition of calculating just
The steady-state current of whole network can be obtained.Asking for steady-state current can be there are many embodiment, for example, can be according to following public affairs
Formula calculates steady-state current：
Wherein, IcSteady-state current for cyclization network；UocVoltage difference for interconnection switch both sides；ZeqFor cyclization Equivalent Network
Impedance；
The transient current for asking for cyclization network can be there are many embodiment, for example, as shown in fig. 6, after cyclization, cyclization net
The differential equation of network is as follows：
Wherein, EmRepresent potential；R represents the resistance of cyclization Equivalent Network impedance, and L represents the electricity of cyclization Equivalent Network impedance
Sense；
After solving the differential equation, transient current is calculated according to equation below：
Wherein, IimTransient current for cyclization network；TaFor time constant；IctSteady-state current for cyclization network.
Based on same inventive concept, the cyclization that a kind of factories and miness distribution network is additionally provided in the embodiment of the present invention judges dress
It puts, as described in the following examples.Due to the principle that the cyclization judgment means of factories and miness distribution network solve the problems, such as and factories and miness distribution
The cyclization judgment method of network is similar, therefore the implementation of the cyclization judgment means of factories and miness distribution network may refer to factories and miness power distribution network
The implementation of the cyclization judgment method of network, overlaps will not be repeated.
Fig. 7 is the cyclization judgment means of the factories and miness distribution network of the embodiment of the present invention.As shown in fig. 7, the embodiment of the present invention
The cyclization judgment means of factories and miness distribution network include：
Model building module 701 establishes cyclization network with according to the boundary node between cyclization network and upper network
External network Equivalent Model；
Equivalent impedance acquisition module 702 obtains cyclization Equivalent Network impedance for being calculated according to external network Equivalent Model；
Current calculation module 703 closes for the voltage difference according to interconnection switch both sides and cyclization Equivalent Network impedance computation
The steady-state current and transient current of loop network；
Cyclization judgment module 704, for determining the steady-state current of cyclization network and transient current less than relay protection electricity
When flowing threshold value and the specified through-flow threshold value of equipment, judge that distribution network being capable of cyclization.
In one embodiment, the cyclization judgment module is further used for：
Determining that the steady-state current of cyclization network and transient current are specified not less than relay protection current threshold and equipment logical
When flowing threshold value, the voltage difference of interconnection switch both sides is adjusted, the stable state electricity of cyclization network is recalculated according to the voltage difference after adjusting
Stream and transient current, until the steady-state current and transient current of cyclization network are less than relay protection current threshold and equipment is specified logical
Threshold value is flowed, judges that distribution network being capable of cyclization.
In one embodiment, as shown in figure 8, the equivalent impedance acquisition module, further comprises：
Injecting power acquisition submodule 801 for the external network Equivalent Model according to cyclization network, calculates and obtains outside
Network injecting power；
Impedance acquisition submodule 802, for obtaining cyclization Equivalent Network impedance according to external network injecting power.
In one embodiment, the injecting power acquisition submodule is calculated according to equation below：
Wherein, EYEQFor external network injecting power；UBVoltage for boundary node；UAVoltage for cyclization network；UCFor
The voltage of external network；SBPower for boundary node；SAPower for cyclization network；SCPower for external network；YBCIt is outer
Transadmittance between portion's network and boundary node；YCCSelf-admittance for external network；
The impedance acquisition submodule, is calculated according to equation below：
Wherein, ZeqFor cyclization Equivalent Network impedance；SiPower for boundary node；y1、y2、yiFor cyclization branch of a network
Admittance；UiVoltage for boundary node.
In one embodiment, the current calculation module,
Including：
Steady-state current is calculated according to equation below：
Wherein, IcSteady-state current for cyclization network；UocVoltage difference for interconnection switch both sides；ZeqFor cyclization Equivalent Network
Impedance；
Transient current is calculated according to equation below：
Wherein, IimTransient current for cyclization network；TaFor time constant；IctSteady-state current for cyclization network.
The embodiment of the present invention additionally provides a kind of computer equipment, including memory, processor and storage on a memory
And the computer program that can be run on a processor, the processor realize factories and miness distribution network when performing the computer program
Cyclization judgment method.
The embodiment of the present invention additionally provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is the computer program for the cyclization judgment method for performing factories and miness distribution network.
In conclusion the cyclization judgment method of factories and miness distribution network provided in an embodiment of the present invention, it is necessary first to establish and close
The external network Equivalent Model of loop network obtains external network equivalent impedance, and then further according to the voltage difference of interconnection switch both sides
Obtain the transient current and steady-state current of cyclization network；It is according to the steady-state current of cyclization network and transient current judgement finally
It is no to carry out Loop Closing Operation.Electric current of the cyclization judgment method of factories and miness distribution network based on cyclization network of the embodiment of the present invention
Judged, judging result is accurate, and judgment method has universality, can be adapted for the cyclization of various industrial enterprise's distribution networks
Operation, reduces the risk of industrial enterprise's Loop Closing Operation, avoids unnecessary power failure, improve power supply reliability.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection domain of invention.
Claims (12)
1. a kind of cyclization judgment method of factories and miness distribution network, which is characterized in that including：
The external network Equivalent Model of cyclization network is established according to the boundary node between cyclization network and upper network；
It is calculated according to external network Equivalent Model and obtains cyclization Equivalent Network impedance；
According to the steady-state current and transient state of the voltage difference of interconnection switch both sides and cyclization Equivalent Network impedance computation cyclization network electricity
Stream；
Determining the steady-state current of cyclization network and transient current less than relay protection current threshold and the specified through-flow threshold value of equipment
When, judge that distribution network being capable of cyclization.
2. the cyclization judgment method of factories and miness distribution network as described in claim 1, which is characterized in that further comprise：
Determining the steady-state current of cyclization network and transient current not less than relay protection current threshold and the specified through-flow threshold of equipment
During value, adjust the voltage difference of interconnection switch both sides, according to the voltage difference after adjusting recalculate cyclization network steady-state current and
Transient current, until the steady-state current and transient current of cyclization network are less than relay protection current threshold and the specified through-flow threshold of equipment
Value, judges that distribution network being capable of cyclization.
3. the cyclization judgment method of factories and miness distribution network as claimed in claim 1 or 2, which is characterized in that described according to outside
Equivalent Network model, which calculates, obtains cyclization Equivalent Network impedance, including：
According to the external network Equivalent Model of cyclization network, calculate and obtain external network injecting power；
Cyclization Equivalent Network impedance is obtained according to external network injecting power.
4. the cyclization judgment method of factories and miness distribution network as claimed in claim 3, which is characterized in that described according to cyclization network
External network Equivalent Model, calculate obtain external network injecting power, calculated according to equation below：
Wherein, EYEQFor external network injecting power；UBVoltage for boundary node；UAVoltage for cyclization network；UCFor outside
The voltage of network；SBPower for boundary node；SAPower for cyclization network；SCPower for external network；YBCFor extranets
Transadmittance between network and boundary node；YCCSelf-admittance for external network；
It is described that cyclization Equivalent Network impedance is obtained according to external network injecting power, it is calculated according to equation below：
Wherein, ZeqFor cyclization Equivalent Network impedance；SiPower for boundary node；y1、y2、yiAdmittance for cyclization branch of a network；
UiVoltage for boundary node.
5. the cyclization judgment method of factories and miness distribution network as claimed in claim 4, which is characterized in that described according to interconnection switch
The voltage difference and external network equivalent impedance of both sides calculate the steady-state current and transient current of cyclization network, including：
Steady-state current is calculated according to equation below：
Wherein, IcSteady-state current for cyclization network；UocVoltage difference for interconnection switch both sides；ZeqIt is hindered for cyclization Equivalent Network
It is anti-；
Transient current is calculated according to equation below：
Wherein, IimTransient current for cyclization network；TaFor time constant；IctSteady-state current for cyclization network.
6. a kind of cyclization judgment means of factories and miness distribution network, which is characterized in that including：
Model building module, with the external network that cyclization network is established according to the boundary node between cyclization network and upper network
Equivalent Model；
Equivalent impedance acquisition module obtains cyclization Equivalent Network impedance for being calculated according to external network Equivalent Model；
Current calculation module, for the voltage difference according to interconnection switch both sides and cyclization Equivalent Network impedance computation cyclization network
Steady-state current and transient current；
Cyclization judgment module, for determine the steady-state current of cyclization network and transient current be less than relay protection current threshold and
During the specified through-flow threshold value of equipment, judge that distribution network being capable of cyclization.
7. the cyclization judgment means of factories and miness distribution network as claimed in claim 6, which is characterized in that the cyclization judges mould
Block is further used for：
Determining the steady-state current of cyclization network and transient current not less than relay protection current threshold and the specified through-flow threshold of equipment
During value, adjust the voltage difference of interconnection switch both sides, according to the voltage difference after adjusting recalculate cyclization network steady-state current and
Transient current, until the steady-state current and transient current of cyclization network are less than relay protection current threshold and the specified through-flow threshold of equipment
Value, judges that distribution network being capable of cyclization.
8. the cyclization judgment means of factories and miness distribution network as claimed in claims 6 or 7, which is characterized in that the equivalent impedance
Acquisition module further comprises：
Injecting power acquisition submodule for the external network Equivalent Model according to cyclization network, calculates and obtains external network note
Enter power；
Impedance acquisition submodule, for obtaining cyclization Equivalent Network impedance according to external network injecting power.
9. the cyclization judgment means of factories and miness distribution network as claimed in claim 8, which is characterized in that the injecting power obtains
Submodule is calculated according to equation below：
Wherein, EYEQFor external network injecting power；UBVoltage for boundary node；UAVoltage for cyclization network；UCFor outside
The voltage of network；SBPower for boundary node；SAPower for cyclization network；SCPower for external network；YBCFor extranets
Transadmittance between network and boundary node；YCCSelf-admittance for external network；
The impedance acquisition submodule, is calculated according to equation below：
Wherein, ZeqFor cyclization Equivalent Network impedance；SiPower for boundary node；y1、y2、yiAdmittance for cyclization branch of a network；
UiVoltage for boundary node.
10. the cyclization judgment means of factories and miness distribution network as claimed in claim 9, which is characterized in that the Current calculation mould
Block, including：
Steady-state current is calculated according to equation below：
Wherein, IcSteady-state current for cyclization network；UocVoltage difference for interconnection switch both sides；ZeqIt is hindered for cyclization Equivalent Network
It is anti-；
Transient current is calculated according to equation below：
Wherein, IimTransient current for cyclization network；TaFor time constant；IctSteady-state current for cyclization network.
11. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any side of claim 1 to 5 when performing the computer program
Method.
12. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has perform claim
It is required that the computer program of 1 to 5 any the method.
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| CN103762594A (en) * | 2014-01-28 | 2014-04-30 | 国家电网公司 | Feeder line loop closing impact current calculation method based on clock synchronization data matrix |
| CN104466945A (en) * | 2014-09-22 | 2015-03-25 | 珠海许继芝电网自动化有限公司 | Method for analyzing loop closing risks based on interconnection switch in power distribution network |
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| CN103762594A (en) * | 2014-01-28 | 2014-04-30 | 国家电网公司 | Feeder line loop closing impact current calculation method based on clock synchronization data matrix |
| CN104466945A (en) * | 2014-09-22 | 2015-03-25 | 珠海许继芝电网自动化有限公司 | Method for analyzing loop closing risks based on interconnection switch in power distribution network |
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