CN106300347A - A kind of engineer applied method that can quickly determine 10kV distribution line cyclization tune electricity feasibility - Google Patents
A kind of engineer applied method that can quickly determine 10kV distribution line cyclization tune electricity feasibility Download PDFInfo
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- CN106300347A CN106300347A CN201610935732.9A CN201610935732A CN106300347A CN 106300347 A CN106300347 A CN 106300347A CN 201610935732 A CN201610935732 A CN 201610935732A CN 106300347 A CN106300347 A CN 106300347A
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- cyclization
- electricity
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- distribution line
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Abstract
The present invention provides a kind of can quickly determine that the engineer applied method of electricity feasibility is adjusted in 10kV distribution line cyclization, and step is as follows: (1) determines the influence factor that can quickly judge that electricity feasibility is adjusted in 10kV distribution line cyclization by analysis；(2) boundary condition to influence factor, is determined from the angle of engineer applied；(3) each influence factor of method is formulated judgement flow process；Provide the benefit that: 1) can quickly judge which 10kV distribution line can adjust electricity to complete by cyclization when adjusting electricity by the present invention, compared with normal Load flow calculation analysis, substantially increase the speed of analysis.It is easy to lexical analysis personnel and makes quickly judgement in daily vast as the open sea tune electricity work.2) easy to utilize, it is not necessary to analysis personnel utilize the Load flow calculation analytical tool of specialty to carry out specialty analysis, as long as i.e. can determine whether whether two 10kV distribution lines possess cyclization and adjust the condition of electricity by this method.It is easy to dispatch operator on duty in emergency processes, makes quickly judgement.
Description
Technical field
The invention belongs to Operation of Electric Systems and control technical field, relating in particular to one and quickly determine 10kV distribution
The method of electricity is adjusted in cyclization.
Background technology
10kV distribution line, when maintenance, fault and hidden danger process, is necessarily required to be transferred to separately existing user
Outer power supply is powered.The means of user's transfer have power failure to adjust electricity and cyclization to adjust electricity both of which, select which kind of pattern then to need root
Judge according to trend distribution during the distribution of distribution line trend and cyclization.If selecting to have a power failure and adjusting power mode, then need user in short-term
Have a power failure, if selecting cyclization to adjust electricity, need not user and having a power failure in short-term.But cyclization adjusts electricity to need to consider trend distribution and cyclization phase
Between power flow changing, when possess cyclization adjust electricity condition time can arrange cyclization adjust electricity.But 10kV distribution line cyclization each time is adjusted
Electricity all takes normal tidal current analysis to calculate, by labor intensive resource significantly.
Summary of the invention
Present invention aims to above-mentioned the deficiencies in the prior art, quickly judge from the angle of engineer applied
Electricity feasibility is adjusted in 10kV distribution line cyclization.Apply existing 10kV distribution tide model to be analyzed, clearly affect 10kV and join
The factor of network closed loop tune electricity, and the boundary condition of each influence factor is analyzed by the angle of engineer applied, thus formulate corresponding
Speed sentence method.
The present invention is achieved by following technical solution:
(1) apply existing 10kV distribution tide model to be analyzed, clearly affect 10kV distribution network closed loop and adjust the factor of electricity.
As a example by Fig. 1 equivalent network, two sections of bus V1 and V2 are respectively for a 10kV circuit, two sections of bus external network equivalent impedances
For R0 and X0；10kV circuit 1 impedance is R1 and X1, and 10kV circuit 2 impedance is R2 and X2, has contact disconnected two 10kV contact points
Road device P, chopper P punish position, and P both sides, contact point exist different current potential VP1, VP2, and the load current I1 on two lines road and
I2。
For guaranteeing cyclization success, when chopper P transports row, should there is not overload or tripping operation in associated loop equipment.But
When chopper P cyclization, define alternate path between V1 and V2, thus following condition can be obtained:
IClose≤min(IN1, IN2) (1)
I0 point=I0-I′0’ (3)
In formula: ICloseLoop current after the cyclization of two lines road during for closing position at chopper P；IN1、IN2Hold for two lines road is specified
Carry electric current；V1 is 10kV circuit 1 head end voltage, and V2 is 10kV circuit 2 head end voltage；R1 and X1 is 10kV circuit 1 impedance；R2 and
X2 is 10kV circuit 2 impedance；I0 pointIt is transferred to the electric current of 10kV loop when 10kV circuit cyclization for external network equivalent network；I0For
External network equivalent network traversal electric current, I' before 10kV circuit cyclization0For external network equivalent network traversal electric current during 10kV circuit cyclization；Ihz
For outer net during 10kV circuit cyclization and 10kV loop total current.
When carrying out Loop Closing Operation, not only need to analyze the steady-state load flow impact on operation of power networks after cyclization, also take an examination
Consider the impact on electric power netting safe running of the transient state trend i.e. dash current after cyclization.Cyclization dash current is that Alloy White Iron may produce
Raw maximum instantaneous value, the general amplitude com parison of dash current is big, but duration is the shortest, due to Three-phase Power Systems pair
Claim, be analyzed as a example by A phase, calculate the single-phase Type Equivalent Circuit Model of cyclization dash current transient process as shown in Figure 2.In figure
Cyclization point both sides voltage difference is equivalent to A phase phase voltage e (t).
The One-terminal of cyclization circuit is:
The algebraic equation that equation is converted in complex frequency domain solves, and the expression formula that can obtain Alloy White Iron is:
Understanding Alloy White Iron according to above expression formula to be made up of two parts respectively, one of them is periodic component, another
For aperiodic component.When circuit parameter is known, the amplitude of periodic component is that size is constant, and aperiodic component is according to finger
The DC component of the rule monotone decreasing of number function.
3) analyze according to above, determine that 10kV distribution line cyclization adjusts electricity influence factor as follows:
The potential difference of voltage difference factor: V1 with V2 is little；
Equipment rated capacity factor: IN1、IN2Bigger；
Major network system through current factor: I0 pointLittle as far as possible；
Effect of Transient Component factor: cyclization transient state dash current can not cause protection act；
(2) from the boundary condition of the angle-determining influence factor of engineer applied
1) factors of voltage
According to 220kV and following equipment cyclization same period generality requirement, voltage amplitude value difference is at 20%UNWithin, phase angle difference exists
Within 25 degree.Therefore, for 10kV distribution network closed loop circuit, its voltage difference should meet following requirement:
|V1-V2|≤0.2 × 10.5=2.1kV
It follows that to meet 220kV and following equipment cyclization same period generality requirement, two 10kV circuit head end electricity
Pressure reduction will be within 2.1kV.
Simultaneously in order to ensure that phase angle difference, within 25 degree, need to guarantee that the phase place of two 10kV circuits, phase sequence are consistent, and for keeping away
Exempt from extraneous factor and 10kV cyclization is adjusted the impact of electricity, it is desirable to two the 10kV circuit of cyclization can not have external generating set also
Net.
2) equipment rated capacity
Because the main purpose of this research is to make 10kV distribution network closed loop adjust electric energy quickly to judge, therefore equipment is specified holds
The selection of loading capability, should select according to the bearing capacity of the device type accounting for maximum specific weight in electrical network.Large-and-medium size cities at present
Mainly just there is less the joining in cross section using JKY-185 insulated conductor or YJV-300 cable as controller switching equipment, part remote districts
Electric line, two kind equipment rated capacity all at about 500A, therefore consider using 500A as equipment rated capacity
Bottom line, in the case of guaranteeing safety, makes 10kV distribution network closed loop limited less.
But can effectively carry out in order to ensure cyclization, the equipment that therefore 10kV distribution network closed loop loop relates to is intended to meet 500A
Bottom line bearing capacity requirement.
3) major network system through current factor
According to preservation of energy, before and after cyclization, flow through power between V1 and V2 2 constant, therefore constant at V1 with V2
In the case of, flow through the I of V1 Yu V2hzConstant, therefore it is contemplated that reduce V1 Yu V2 voltage difference to reduce Ihz, thus reduce IClose.Due to
After 10kV distribution line cyclization, 10kV forms electromagnetic looped network with major network, and according to Ohm's law, electromagnetic looped network total impedance should be less than respectively
The branch that parallel branches middle impedance is minimum, but the impedance of major network system is typically less than 10kV distribution line impedance, therefore
It is contemplated that reduce major network system impedance value to control major network system through current.
Thus can formulate claimed below: 1) reduce V1 Yu V2 difference in the reasonable scope；2) major network system impedance is reduced.Pass through
The two requires to make the impact of major network system through current less as far as possible.
For 10kV voltage difference, according to current line voltage practical situation, general 10kV busbar voltage acceptability limit is
(10.0-10.7kV), therefore considering to reduce in this range by voltage difference, the voltage magnitude deviation that both can meet the cyclization same period is wanted
Ask, also can meet the voltage deviation requirement under normal operation so that 10kV distribution network closed loop is limited less.
For major network system impedance, according to current real work management requirement, 500kV-110kV and bigger must not occur
The electromagnetic looped network of electric pressure difference.110kV, 35kV that therefore 10kV distribution network closed loop is limited to same 110kV bussed supply become
Power station 10kV distribution line, so that the impedance of 110kV major network system as far as possible little, also meet real work management and wants
Ask.
4) Effect of Transient Component factor
According to formula (6) (7), cyclization electro-magnetic transient impact process is divided into periodic component and aperiodic component, wherein cycle
Component is steady-state component, and aperiodic component is relevant with the phase angle of elementary threshold voltage again in initial value size, decline rate then and
In the middle of circuit, the ratio of R/L is relevant.So, for concrete distribution loop, aperiodic, dash current value was equal to stable state circulation width
Value is multiplied by a fixing coefficient, typically takes 1.8～1.9 in engineering calculation；And damped cycle is usually no more than 10 cycles
(0.2S)。
According to the setting principle of 10kV route protection definite value, it is 3000A that 10kV circuit crosses I section of minimum movements definite value of stream,
10kV circuit crosses 1.4～1.5 times that III section of minimum movements definite value of stream is CT mono-sub-value.Need to consider following condition:
IN1×(1+1.9)≤3000A
tN3≥0.2S
Therefore consider that the steady-state current of 10kV circuit, less than 1000A, met III section of time delay of stream simultaneously and is not less than 0.2S,
Can ensure that cyclization impact transient process does not affect protection act.Need to consider that this specific electric load is not more than plus passing through load for this
1000A, formulates this specific electric load and is not more than the requirement of 500A (according to actual bearer ability).
(3) cyclization of 10kV distribution line adjusts electricity feasibility speed to sentence condition
Analyze according to the influence factor's boundary condition above in relation to voltage, device load-bearing capability, electric current, transient process, can
Formulate following speed and sentence condition:
Condition 1: require by the transformer station 10kV distribution outlet of same 110kV bussed supply；
Condition 2: require that two 10kV line Phases, phase sequence are consistent, and grid-connected without generating set on circuit；
Condition 3: require that two 10kV circuit head end busbar voltage differences are within 0.7kV；
Condition 4: require that 10kV distribution network closed loop circuit units rated capacity is more than or equal to 500A；
Condition 5: require that 10kV single line load, less than 500A, crosses III section of time delay of stream more than 0.2S.
The technique effect of the present invention is as follows:
1) can quickly judge which 10kV distribution line can adjust electricity to complete by cyclization when adjusting electricity by the present invention,
Compared with normal Load flow calculation analysis, substantially increase the speed of analysis.It is easy to lexical analysis personnel daily vast as the open sea
The work of tune electricity in make quickly judgement.
It is 2) easy to utilize, it is not necessary to analysis personnel utilize the Load flow calculation analytical tool of specialty to carry out specialty analysis,
As long as i.e. can determine whether whether two 10kV distribution lines possess cyclization and adjust the condition of electricity by this method.It is easy to dispatch operator on duty
Quickly judgement is made in emergency processes.
Accompanying drawing explanation
Fig. 1 is 110kV distribution equivalence cyclization illustraton of model；
Fig. 2 is the single-phase Type Equivalent Circuit Model figure of cyclization dash current transient process；
Fig. 3 is the decision flow chart of the present invention.
Detailed description of the invention
A kind of engineer applied method that can quickly determine 10kV distribution line cyclization tune electricity feasibility, feature of present invention exists
In, step is as follows:
(1) border of the factor affecting 10kV distribution line cyclization tune electricity probability is determined by the angle of engineer applied
Condition:
Determine that influence factor is:
1) voltage difference factor
Article two, within 10kV circuit head end voltage difference is located at 2.1kV；Article two, the 10kV circuit of cyclization can not there be outer sending and receiving
Group of motors is grid-connected；
2) equipment rated capacity factor
The equipment that 10kV distribution network closed loop loop relates to is intended to meet the bottom line bearing capacity of 500A, it is desirable to as follows: 1) loop
In current transformer ratio be 500/5 and more than；2) in loop overhead line conductor cross section be 185mm2 and more than；3) loop
In the cross-section of cable be 300mm2 and more than；4) chopper in loop, disconnecting switch, the rated current of on-load switch are more than
500A；
3) major network system through current factor
1) reduce V1 Yu V2 difference in the reasonable scope, typically consider within 0.7kV；2) major network system impedance is reduced, to the greatest extent
Amount make major network system through current impact less, 10kV distribution network closed loop is limited to same 110kV bussed supply 110kV,
35kV transformer station 10kV distribution line, through current impact is less；
4) Effect of Transient Component factor
The steady-state current of 10kV circuit is less than 1000A, met III section of time delay of stream simultaneously and is not less than 0.2S, and i.e. ensured to close
Ring impact transient process does not affect protection act, and this specific electric load adding, passing through load is not more than 1000A, formulates this specific electric load not
More than 500A；
(2) determine that speed sentences condition according to influence factor
According to Such analysis, it is as follows that 10kV distribution line cyclization adjusts electricity speed to sentence condition:
Condition 1: determine it is by the transformer station 10kV distribution outlet of same 110kV bussed supply；
Condition 2: determine and need two 10kV line Phases of cyclization, phase sequence consistent and grid-connected without generating set on circuit；
Condition 3: clear and definite two 10kV circuit head end busbar voltage differences are within 0.7kV；
Condition 4: clear and definite 10kV distribution network closed loop circuit units rated capacity is more than or equal to 500A；
Condition 5: clear and definite 10kV single line load is less than 500A, crosses III section of time delay of stream more than 0.2S；
Meet the 10kV distribution line of above 5 conditions, cyclization all can be taked to adjust electricity.
(3) present invention specifically speed is sentenced flow process and should be performed as follows:
1) after corresponding analysis personnel receive tune electricity task, by the personnel of analysis first, it is settled that adjust the 10kV circuit of electricity and need
The object 10kV circuit to be adjusted.
2) whether the 110kV power supply that analysis personnel review these two 10kV distribution lines of verification by drawing is same
110kV bus.If not then taking to have a power failure to adjust electricity, judge if then can be carried out next.
3) personnel are analyzed the most consistent according to phase place, the phase sequence of corresponding data these two 10kV distribution lines clear and definite, and two
All without affecting the generating set of phase difference of voltage on bar circuit.If not then taking to have a power failure to adjust electricity, sentence if then can be carried out next
Disconnected.
4) analysis personnel search these two 10kV distribution lines by monitoring system and in the head end voltage difference of transformer substation side are
No within 0.7kV.If not then taking to have a power failure to adjust electricity, judge if then can be carried out next.
5) the equipment rated capacity that analysis personnel investigate these two 10kV distribution lines by equipment account data is
No all 500A and more than.If not then taking to have a power failure to adjust electricity, judge if then can be carried out next.
6) whether the load that analysis personnel search these two 10kV circuits by monitoring system is respectively less than 500A, corresponding protection
Whether the stream III section time delay definite value excessively of device is more than 0.5S.If not then taking to have a power failure to adjust electricity, if cyclization tune then can be carried out
Electricity.
Concrete analysis judges that flow process is as shown in Figure 3.
Claims (1)
1. one kind can quickly determine that the engineer applied method of electricity feasibility is adjusted in 10kV distribution line cyclization, it is characterised in that step
As follows: (1) determines the perimeter strip affecting the factor that electricity probability is adjusted in 10kV distribution line cyclization by the angle of engineer applied
Part:
Determine that influence factor is:
1) voltage difference factor
Article two, within 10kV circuit head end voltage difference is located at 2.1kV；Article two, the 10kV circuit of cyclization can not there is external electromotor
Organize grid-connected；
2) equipment rated capacity factor
The equipment that 10kV distribution network closed loop loop relates to is intended to meet the bottom line bearing capacity of 500A, it is desirable to as follows: 1) in loop
Current transformer ratio be 500/5 and more than；2) in loop overhead line conductor cross section be 185mm2 and more than；3) in loop
The cross-section of cable be 300mm2 and more than；4) chopper in loop, disconnecting switch, the rated current of on-load switch are more than 500A；
3) major network system through current factor
1) reduce V1 Yu V2 difference in the reasonable scope, typically consider within 0.7kV；2) reduce major network system impedance, make as far as possible
Obtain the impact of major network system through current less, 10kV distribution network closed loop is limited to 110kV, 35kV of same 110kV bussed supply
Transformer station's 10kV distribution line, through current impact is less；
4) Effect of Transient Component factor
The steady-state current of 10kV circuit is less than 1000A, met III section of time delay of stream simultaneously and is not less than 0.2S, and i.e. ensured cyclization punching
Hit transient process and do not affect protection act, this specific electric load is added, and passing through load is not more than 1000A, formulates this specific electric load and be not more than
500A；
(2) determine that speed sentences method according to influence factor
According to Such analysis, it is as follows that 10kV distribution line cyclization adjusts electricity speed to sentence condition:
Condition 1: determine it is by the transformer station 10kV distribution outlet of same 110kV bussed supply；
Condition 2: determine and need two 10kV line Phases of cyclization, phase sequence consistent and grid-connected without generating set on circuit；
Condition 3: clear and definite two 10kV circuit head end busbar voltage differences are within 0.7kV；
Condition 4: clear and definite 10kV distribution network closed loop circuit units rated capacity is more than or equal to 500A；
Condition 5: clear and definite 10kV single line load is less than 500A, crosses III section of time delay of stream more than 0.2S；
By the 10kV distribution line of above 5 conditional judgments, cyclization all can be taked to adjust electricity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109858842A (en) * | 2019-03-19 | 2019-06-07 | 广东电网有限责任公司 | A kind of appraisal procedure, device and the equipment of regional power grid cyclization feasibility |
| CN110994610A (en) * | 2019-12-24 | 2020-04-10 | 国网天津市电力公司 | Monitoring information assistance-based loop closing method and device for power distribution network line |
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