CN107623328A - A kind of method for reducing closed loop network electric current - Google Patents

A kind of method for reducing closed loop network electric current Download PDF

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Publication number
CN107623328A
CN107623328A CN201710870674.0A CN201710870674A CN107623328A CN 107623328 A CN107623328 A CN 107623328A CN 201710870674 A CN201710870674 A CN 201710870674A CN 107623328 A CN107623328 A CN 107623328A
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mrow
msub
mover
voltage
mtr
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CN107623328B (en
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徐大勇
朱凌
王毕元
徐宝琦
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Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The present invention relates to power network schedule automation field, more particularly, to a kind of method for reducing closed loop network electric current, comprises the following steps S1, carries out main distribution network model splicing.S2, state estimation is carried out to spliced model.S3, capacitive reactance device is grouped and sorted by measure.S4, carry out initial Load flow calculation.S5, carry out Alloy White Iron calculating.S6, judges whether to meet to terminate design conditions, S7, determine whether can switching capacitive reactance device, S8 is by group order switching capacitive reactance device one by one.S9, re-start Load flow calculation.S10, sorted by group, voltage magnitude variation and carry out Alloy White Iron calculating.S11, main file position is operated and carries out Load flow calculation.S12, carries out Alloy White Iron calculating, and S13 judges whether to terminate design conditions.Alloy White Iron actively can be reduced to switch protection limit by the present invention, prevent from tripping because Alloy White Iron is excessive out-of-limit, reduce the risk that has a power failure caused by Loop Closing Operation failure.

Description

A kind of method for reducing closed loop network electric current
Technical field
The present invention relates to power network schedule automation field, more particularly, to a kind of side for reducing closed loop network electric current Method.
Background technology
The size and distributing position of load in power distribution network, the distribution of line voltage will be influenceed so that deposit cyclization switch both sides In certain electrical potential difference.When carrying out Loop Closing Operation, in the presence of electrical potential difference, circulation will be produced in looped network, causes power network Trend distribution changes.Therefore, the potential of network structure and the cyclization switch both sides caused by the asymmetry of power load distributing Difference is the main reason for Alloy White Iron produces.
When power distribution network carries out maintenance and the transfer of non-faulting area load, it is often necessary to carry out Loop Closing Operation.During cyclization, it is necessary to The size of Alloy White Iron is controlled, only when ensuring that Alloy White Iron is no more than protection limit, two lines road can be carried out Cyclization, otherwise, Alloy White Iron can be caused excessive out-of-limit and tripped, make operation failure, cause power failure range to expand.
For power distribution network, the size of Alloy White Iron and cyclization point both sides voltage amplitude value difference, phase angle difference, equivalent impedance etc. because It is plain related, once the Alloy White Iron calculated, beyond protection limit, according to operational procedure, regulation and control personnel can not carry out cyclization behaviour Make, can only passively wait Alloy White Iron to carry out Loop Closing Operation when being reduced to switch protection limit again, when Alloy White Iron ability There is certain uncertainty without departing from switch rupturing capacity, cause power supply interrupted district to recover in time.
The content of the invention
The present invention is to overcome at least one defect described in above-mentioned prior art, there is provided one kind reduces closed loop network electric current Method, Alloy White Iron actively can be reduced to switch protection limit, trip, make so as to prevent Alloy White Iron excessive out-of-limit Power failure range is caused to expand into operation failure.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of side for reducing closed loop network electric current Method, comprise the following steps：
S1, carry out main distribution network model splicing；
S2, state estimation is carried out to spliced model；
S3, capacitive reactance device is grouped and sorted by measure；
S4, carry out initial Load flow calculation；
S5, carry out Alloy White Iron calculating；
S6, judge whether to meet to terminate design conditions, if being unsatisfactory for end condition, continue to operate in next step；
S7, determine whether can switching capacitive reactance device；
S8, by group order switching capacitive reactance device one by one；
S9, re-start Load flow calculation；
S10, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
S11, when can not switching capacitive reactance device when, main shift is operated, and re-start Load flow calculation；
S12, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
S13, terminate and calculate.
Further, in step sl, main distribution network model splicing is carried out：Alloy White Iron size is by Net Frame of Electric Network in power distribution network Have a great influence, particularly had a great influence by sub-area division, the meter of Alloy White Iron can not be efficiently accomplished by only relying only on electricity distribution network model Calculate, result of calculation confidence level is relatively low.Spliced during main distribution network model splicing according to power network differentiated control principle.
The model of splicing is node-branch model.It is broadly divided into following three types of model：
A. bus nodes：Switchyard bus in power distribution network, transformer station's 10kV buses are reduced to bus nodes.
B. branch road：Cable branch road, overhead transmission line are treated as branch road.
C. winding：Transformer is treated as winding.
Further, in step s 2, state estimation is carried out to spliced model, state estimation is Power System Analysis Base application, the purpose is to estimate the actual motion state of power network according to the measurement information of power network, be generally basede in practical plus Weigh the principle of least square and carry out state estimation.
Piecemeal is carried out to measurement jacobian matrix using the blocking characteristic of Power system state estimation problem, according to information square The piecemeal sparsity structure of battle array enters the optimization of position No., is disappeared by column Meta-Policy using rotating shaft is become, is selected based on minimum degree principle dynamic Rotating shaft element is selected, the minimum principle selection rotation element of element is injected according to non-zero, had both reduced required memory headroom, but it is bright It is aobvious to improve execution efficiency.
Further, in step s3, capacitor, reactor and the transformer of cyclization switch both sides are listed, to capacitive reactance device Size packets sort by measure, with high-voltage side capacitor, low voltage side reactor, low voltage side capacitor, high-voltage side electricity Anti- device sorts successively.
Further, in step S4, initial Load flow calculation is carried out to the switch for being intended to cyclization first, obtains busbar voltage difference Ratio is poor.
Further, in step S5, after carrying out calculating Alloy White Iron, if switch Alloy White Iron limits more than switch protection Volume, then continue to calculate in next step, otherwise stop cyclization and calculate.
Wherein, in power distribution network, power factor is higher, and it is common with voltage difference Alloy White Iron can be regarded to load difference as The result of effect.For given rack and mode, it is assumed that load difference and loop circuit impedance are constant, then can be by adjusting voltage Pressure difference influences Alloy White Iron.Therefore it is by the calculating equivalence of Alloy White Iron：
Wherein：
Iloop_baseFor Alloy White Iron virtual value；
IbaseFor the circulation caused by the preceding both sides load difference of cyclization；
For the voltage vector of the high side of voltage magnitude before cyclization；
For the voltage vector of the relatively low side of voltage magnitude before cyclization.
Further, using step S5 result of calculations, judge whether to meet that S6 terminates design conditions.
Terminating design conditions includes：
1 without available capacitive reactance device resource or main transformer resource；
2-in-1 circular current is less than protection limit；
Further, if because the Alloy White Iron that capacitive reactance device acts and carries out calculates, the condition terminated is dereliction shift Resource is adjustable.
Further, in the step s 7, when can not switching capacitive reactance device after still without meet terminate design conditions, then enter Row main transformer operates S11.When have can switching capacitive reactance device after, then continued executing with into step S8.
Judge that cyclization switchs both sides capacitive reactance device state, put into capacitive reactance device as steps described below：
A. size order cuts off capacitor by measure for side high to voltage first；
B. when the high side of voltage is without resectable capacitor, in the size order excision reactance by measure of voltage downside Device；
C. capacitor is put into the low side of voltage；
D. when the low side of voltage can be thrown outside capacitor, then reactor is put into the high side of voltage.
Using these principles, some irrational switchings in actual motion can be avoided, number of equipment action is reduced, carries High service life of equipment.
Further, in step S9, after the action of each capacitive reactance device, Load flow calculation is re-started, obtains cyclization switch two The new amplitude of side and the variable quantity of phase angle；
Calculation formula is as follows：
Wherein：
For low-pressure side voltage vector after this adjustment；
Uim-1Low-pressure side voltage adjustment vector after being acted for the last time；
For high side voltage vector after this adjustment；
High side voltage vector after being acted for the last time.
Further, in step S10, the group in step S3 is pressed to busbar voltage amplitude variation after capacitive reactance device switching operation It is not ranked up respectively and recalculates Alloy White Iron, until Alloy White Iron is not past protection limit (then stopping calculating) or without appearance It is anti-movable, then stop calculating；
Calculation formula is：
Wherein：
IloopFor Alloy White Iron；
ILimitTo protect limit,；
To put into or cutting off the new voltage vector after capacitive reactance device；
For variation in voltage amount after accumulative action；
After the completion of being acted in same group, next group action could be carried out.
Further, in step S11, the main shift of involutive ring switch both sides is increased and reduced operation successively, is counted It is as follows to calculate principle：
A. when the main transformer high side voltage corresponding to the high side of voltage it is on the upper side in limited time, corresponding main transformer high-pressure side gear to It is upper to transfer one grade；
B. when the main transformer high side voltage corresponding to voltage downside is on the lower side in limited time, corresponding main transformer high-pressure side gear is downward Transfer one grade；
C. after re-starting Load flow calculation, the busbar voltage amplitude of cyclization switch both sides and the variable quantity of phase angle are obtained.
Calculation formula is as follows：
Wherein：
For low-pressure side voltage vector after this adjustment；
Uin-1Low-pressure side voltage adjustment vector after being acted for the last time；
For high side voltage vector after this adjustment；
High side voltage adjustment vector after being acted for the last time.
Further, in step S11, grasped successively from big to small by busbar voltage amplitude variation after main shift Make, Alloy White Iron is recalculated with formula in step S8, until Alloy White Iron is not past limit (then stopping calculating) or dereliction Become adjustable (then stopping step S13).
Compared with prior art, beneficial effect is：
1st, Alloy White Iron actively can be reduced to switch protection limit, is jumped so as to prevent Alloy White Iron excessive out-of-limit Lock, operation failure is caused to cause power failure range to expand；
2nd, using the principle in step S8, some irrational switchings in actual motion can be avoided, equipment is reduced and moves Make number, improve service life of equipment.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is the capacitive reactance device flow that size packets sort by measure in step S3 of the present invention.
Embodiment
Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；It is attached in order to more preferably illustrate the present embodiment Scheme some parts to have omission, zoom in or out, do not represent the size of actual product；To those skilled in the art, Some known features and its explanation may be omitted and will be understood by accompanying drawing.Being given for example only property of position relationship described in accompanying drawing Explanation, it is impossible to be interpreted as the limitation to this patent.
As shown in Figure 1, 2, a kind of method for reducing closed loop network electric current, comprises the following steps：
S1, carry out main distribution network model splicing；
S2, state estimation is carried out to spliced model；
S3, capacitive reactance device is grouped and sorted by measure；
S4, carry out initial Load flow calculation；
S5, carry out Alloy White Iron calculating；
S6, judge whether to meet to terminate design conditions, if being unsatisfactory for end condition, continue to operate in next step；
S7, determine whether can switching capacitive reactance device；
S8, by group order switching capacitive reactance device one by one；
S9, re-start Load flow calculation；
S10, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
S11, when can not switching capacitive reactance device when, main shift is operated, and re-start Load flow calculation；
S12, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
S13, terminate and calculate.
In the present embodiment, in step sl, main distribution network model splicing is carried out：Alloy White Iron size is by power network in power distribution network Rack is had a great influence, and is particularly had a great influence by sub-area division, and Alloy White Iron can not be efficiently accomplished by only relying only on electricity distribution network model Calculating, result of calculation confidence level is relatively low.Spliced during main distribution network model splicing according to power network differentiated control principle.
The model of splicing is node-branch model.It is broadly divided into following three types of model：
A. bus nodes：Switchyard bus in power distribution network, transformer station's 10kV buses are reduced to bus nodes.
B. branch road：Cable branch road, overhead transmission line are treated as branch road.
C. winding：Transformer is treated as winding.
In the present embodiment, in step s 2, state estimation is carried out to spliced model, state estimation is power system The base application of analysis, the purpose is to the actual motion state of power network, general base in practicality are estimated according to the measurement information of power network State estimation is carried out in weighted least-squares principle.
Wherein, piecemeal is carried out to measurement jacobian matrix using the blocking characteristic of Power system state estimation problem, according to The piecemeal sparsity structure of information matrix enters the optimization of position No., is disappeared by column Meta-Policy using rotating shaft is become, based on minimum degree principle Dynamic select rotating shaft element, the minimum principle selection rotation element of element is injected according to non-zero, it is empty both to have reduced required internal memory Between, execution efficiency is significantly improved again.
In the present embodiment, in step s3, capacitor, reactor and the transformer of cyclization switch both sides are listed, to holding Size packets sort anti-device by measure, with high-voltage side capacitor, low voltage side reactor, low voltage side capacitor, high voltage Reactor sorts successively.
In the present embodiment, in step S4, initial Load flow calculation is carried out to the switch for being intended to cyclization first, obtains busbar voltage The ratio of difference is poor.
In the present embodiment, in step S5, calculating Alloy White Iron is carried out, if switch Alloy White Iron limits more than switch protection Volume, then continue to calculate in next step, otherwise stop cyclization and calculate.
Wherein, in power distribution network, power factor is higher, and it is common with voltage difference Alloy White Iron can be regarded to load difference as The result of effect.For given rack and mode, it is assumed that load difference and loop circuit impedance are constant, then can be by adjusting voltage Pressure difference influences Alloy White Iron.Therefore it is by the calculating equivalence of Alloy White Iron：
Wherein：
Iloop_baseFor Alloy White Iron virtual value；
IbaseFor the circulation caused by the preceding both sides load difference of cyclization；
For the voltage vector of voltage magnitude high side before cyclization；
For the voltage vector of voltage magnitude downside before cyclization.
In the present embodiment, in step S6, if switch Alloy White Iron exceedes switch protection limit, next step S7 is continued Judge, otherwise stop cyclization and calculate.
In the present embodiment, step S7 determine whether can switching capacitive reactance device, if without can switching capacitive reactance device, i.e., All capacitive reactance device resources have participated in calculating, then are transferred to step S11 and are calculated.Otherwise it is transferred in step S8,
In the present embodiment, in step s 8, judge that cyclization switchs both sides capacitive reactance device state, input is held as steps described below Anti- device：
A. size order cuts off capacitor by measure for side high to voltage first；
B. when the high side of voltage is without resectable capacitor, in the size order excision reactance by measure of voltage downside Device；
C. capacitor is put into the low side of voltage；
D. when the low side of voltage can be thrown outside capacitor, then reactor is put into the high side of voltage.
Using these principles, some irrational switchings in actual motion can be avoided, number of equipment action is reduced, carries High service life of equipment.
In the present embodiment, in step S8, after the action of each capacitive reactance device, S9 Load flow calculations is re-started, obtain cyclization Switch the new amplitude of both sides and the variable quantity of phase angle；
Calculation formula is as follows：
Wherein：
For low-pressure side voltage vector after this adjustment；
Uim-1Low-pressure side voltage adjustment vector after being acted for the last time；
For high side voltage vector after this adjustment；
High side voltage vector after being acted for the last time.
In the present embodiment, in step S10, busbar voltage amplitude variation after capacitive reactance device switching operation is pressed in step S3 Group be ranked up respectively and recalculate Alloy White Iron, until Alloy White Iron not past protection limit (then stop calculate) or It is movable without capacitive reactance, then stop calculating；
Calculation formula is：
Wherein：
IloopFor Alloy White Iron；
ILimitTo protect limit,；
To put into or cutting off the new voltage vector after capacitive reactance device；
For variation in voltage amount after accumulative action；
After the completion of being acted in same group, next group action could be carried out.
In the present embodiment, in step S11, the main shift of involutive ring switch both sides is increased and reduced behaviour successively Make, calculating principle is as follows：
A. when the main transformer high side voltage corresponding to the high side of voltage it is on the upper side in limited time, corresponding main transformer high-pressure side gear to It is upper to transfer one grade；
B. when the main transformer high side voltage corresponding to voltage downside is on the lower side in limited time, corresponding main transformer high-pressure side gear is downward Transfer one grade；
C. after re-starting Load flow calculation, the busbar voltage amplitude of cyclization switch both sides and the variable quantity of phase angle are obtained.
Calculation formula is as follows：
Wherein：
For low-pressure side voltage vector after this adjustment；
Uin-1Low-pressure side voltage adjustment vector after being acted for the last time；
For high side voltage vector after this adjustment；
High side voltage adjustment vector after being acted for the last time.
In the present embodiment, in step S11, carried out successively from big to small by busbar voltage amplitude variation after main shift Operation, Alloy White Iron S12 is recalculated with formula in step S10, and judges whether to meet to terminate design conditions S6, if full Foot, then terminate and calculate S13.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention Protection domain within.

Claims (11)

  1. A kind of 1. method for reducing closed loop network electric current, it is characterised in that comprise the following steps：
    S1, carry out main distribution network model splicing；
    S2, state estimation is carried out to spliced model；
    S3, capacitive reactance device is grouped and sorted by measure；
    S4, carry out initial Load flow calculation；
    S5, carry out Alloy White Iron calculating；
    S6, judge whether to meet to terminate design conditions, if being unsatisfactory for end condition, continue to operate in next step；
    S7, determine whether can switching capacitive reactance device；
    S8, by group order switching capacitive reactance device one by one；
    S9, re-start Load flow calculation；
    S10, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
    S11, when can not switching capacitive reactance device when, main shift is operated, and re-start Load flow calculation；
    S12, Alloy White Iron calculating is carried out, and judge whether to terminate and calculate；
    S13, terminate and calculate.
  2. A kind of 2. method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S1, institute The main distribution network model splicing stated is spliced according to power network differentiated control principle, and the model of splicing is node-branch model, mainly It is divided into following three types of model：
    A. bus nodes：Switchyard bus in power distribution network, transformer station's 10kV buses are reduced to bus nodes；
    B. branch road：Cable branch road, overhead transmission line are treated as branch road；
    C. winding：Transformer is treated as winding.
  3. A kind of 3. method of described reduction closed loop network electric current according to claim 1, it is characterised in that step S2 In, state estimation is carried out to spliced model, using the blocking characteristic of Power system state estimation problem to measuring Jacobi Matrix carries out piecemeal, enters the optimization of position No. according to the piecemeal sparsity structure of information matrix, is disappeared by column first plan using rotating shaft is become Slightly, based on minimum degree principle dynamic select rotating shaft element, the minimum principle selection rotation element of element is injected according to non-zero.
  4. A kind of 4. method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S3, row Go out capacitor, reactor and the transformer of cyclization switch both sides, size packets sort by measure to capacitive reactance device, described sequence For：High-voltage side capacitor, low voltage side reactor, low voltage side capacitor, high-voltage side reactor sort successively.
  5. 5. a kind of method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S5, such as Fruit switch Alloy White Iron exceedes switch protection limit, then continues to calculate in next step, otherwise stop cyclization and calculate, the meter of Alloy White Iron Calculating equivalence is：
    <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> <mo>_</mo> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>+</mo> <mi>k</mi> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>
    Wherein：
    Iloop_baseFor Alloy White Iron virtual value；
    IbaseFor the circulation caused by the preceding both sides load difference of cyclization；K is loop admittance；
    For the voltage vector of high voltage amplitude side before cyclization；
    For the voltage vector of low voltage amplitudes side before cyclization.
  6. 6. a kind of method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S6, eventually Only design conditions include：
    1. without available capacitive reactance device resource or main transformer resource；
    2. Alloy White Iron is less than protection limit.
  7. 7. a kind of method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S8, press Capacitive reactance device is put into according to following steps：
    A. to high voltage side, size order cuts off capacitor by measure first；
    B. when high voltage compared with side without resectable capacitor when, low-voltage side by measure size order excision reactor；
    C. capacitor is put into low-voltage side；
    D. when low-voltage side can not be thrown outside capacitor, then reactor is put into high voltage side.
  8. A kind of 8. method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S9, After each capacitive reactance device action, Load flow calculation is re-started, obtains the new amplitude of cyclization switch both sides and the variable quantity of phase angle；
    Calculation formula is as follows：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>i</mi> <mi>m</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>m</mi> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>j</mi> <mi>m</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>m</mi> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
    Wherein：
    For low-pressure side voltage vector after this adjustment；
    Uim-1Low-pressure side voltage adjustment vector after being acted for the last time；
    For high side voltage vector after this adjustment；
    High side voltage vector after being acted for the last time.
  9. 9. a kind of method for reducing closed loop network electric current according to claim 1, it is characterised in that right in step S10 Busbar voltage amplitude variation is ranked up and recalculates cyclization respectively by the group in step S3 after capacitive reactance device switching operation Electric current, until meeting to terminate design conditions, then stop calculating；
    Calculation formula is：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mo>&amp;le;</mo> <msub> <mi>I</mi> <mrow> <mi>L</mi> <mi>i</mi> <mi>m</mi> <mi>i</mi> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mi>i</mi> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>t</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>i</mi> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mi>j</mi> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>t</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <mrow> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>j</mi> <mi>t</mi> </mrow> </msub> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>b</mi> <mi>a</mi> <mi>s</mi> <mi>e</mi> </mrow> </msub> <mo>+</mo> <mi>k</mi> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mi>i</mi> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mi>j</mi> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>
    Wherein：
    IloopFor Alloy White Iron；
    ILimitTo protect limit；
    To put into or cutting off the new voltage vector after capacitive reactance device；
    For variation in voltage amount after accumulative action；
    After the completion of being acted in same group, next group action could be carried out.
  10. A kind of 10. method for reducing closed loop network electric current according to claim 1, it is characterised in that in step S11, The main shift of involutive ring switch both sides is increased and reduces operation successively, and principle is as follows：
    A. when the main transformer high side voltage corresponding to the higher side of voltage is on the upper side in limited time, corresponding main transformer high-pressure side gear is upward Transfer one grade；
    B. when the main transformer high side voltage corresponding to the low side of voltage is on the lower side in limited time, corresponding main transformer high-pressure side gear is to downward It is dynamic one grade；
    C. after re-starting Load flow calculation, the busbar voltage amplitude of cyclization switch both sides and the variable quantity of phase angle are obtained；
    Calculation formula is：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>i</mi> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&amp;Delta;U</mi> <mrow> <mi>j</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>n</mi> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mrow> <mi>j</mi> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
    Wherein：
    For low-pressure side voltage vector after this adjustment；
    Uin-1Low-pressure side voltage adjustment vector after being acted for the last time；
    For high side voltage vector after this adjustment；
    High side voltage adjustment vector after being acted for the last time.
  11. A kind of 11. method of reduction closed loop network electric current according to claim any one of 1-10, it is characterised in that step In rapid S11, busbar voltage amplitude variation is operated successively from big to small after being acted by main shift, with public in step S8 Formula recalculates Alloy White Iron, until meeting to terminate design conditions.
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