CN105552882B - A kind of control method of power network cyclization - Google Patents
A kind of control method of power network cyclization Download PDFInfo
- Publication number
- CN105552882B CN105552882B CN201510904671.5A CN201510904671A CN105552882B CN 105552882 B CN105552882 B CN 105552882B CN 201510904671 A CN201510904671 A CN 201510904671A CN 105552882 B CN105552882 B CN 105552882B
- Authority
- CN
- China
- Prior art keywords
- cyclization
- power
- interconnection
- network
- loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of control method of power network cyclization, mainly comprise the following steps：Equivalent circuit after simplifying is drawn according to power network cyclization network, obtain the load on the equivalent impedance and the side bus of interconnection two in cyclization loop network, the complex power for flowing to interconnection bus is obtained according to loop network feature, with the complex power for flowing to the side bus of interconnection one subtract flow out the bus load try to achieve circulation complex power, cyclization steady-state current is calculated by circulation complex power again, cyclization dash current, by cyclization steady-state current and the maximum allowable operating current of interconnection, compared with cyclization dash current protects trigger current with instantaneous over-current, and then judge whether that Loop Closing Operation can be performed.The method of the invention is simple and practical, safe and reliable, major network, the Loop Closing Operation of distribution are applicable, and foundation can be provided for power network Loop Closing Operation, helps power dispatcher to make rationally beneficial adjustment to power system operating mode by cyclization, so as to improve power supply reliability, ensure user benefit.
Description
Technical field
The present invention relates to power network cyclization technical field, more particularly to a kind of control method of power network cyclization.
Background technology
With developing rapidly for economy, the requirement more and more higher to power supply reliability, in power network between different substation
Interconnection is that load transfer and the adjustment method of operation are provided convenience, and optimizing and revising power system operating mode by cyclization can effectively carry
High power supply reliability.But unfavorable Loop Closing Operation can produce excessive Alloy White Iron, cause protection act to trip, expand and have a power failure
Area.The Loop Closing Operation of major network with the experiential operating of dispatcher, is based on insufficient grounds mostly, risk be present；The Loop Closing Operation of distribution shows
Have that technology is still immature, or calculate that complicated or accuracy is not high, the power failure for being still traditional mostly turns to supply, and cyclization turns supply and used
Rate is low.
The content of the invention
The technical problems to be solved by the invention are to overcome defect described above, there is provided one kind calculates accurate, easy to operate
Power network cyclization control method, carry out main, distribution network closed loop operation for power dispatcher and foundation be provided, effectively improve power supply reliably
Property.
In order to solve the problems, such as techniques described above, the control method of power network cyclization of the present invention, comprise the following steps：
（1）It is assumed that whole network voltage is rated voltage, ignore admittance branch road, drawn according to power network cyclization network after simplifying
Equivalent circuit；
（2）Obtain the load on the equivalent impedance and the side bus of interconnection two in cyclization loop network；
（3）The characteristics of being distributed according to loop network trend, obtains the complex power for flowing to interconnection bus, and the complex power is used
The plural form of equivalent impedance and interconnection both sides bus load represents；
（4）The load for flowing out the bus is subtracted by the complex power for flowing to the side bus of interconnection one, obtains flowing through connection during cyclization
Circulation complex power during the complex power, i.e. cyclization of winding thread, the circulation complex power are born with equivalent impedance and the side bus of interconnection two
The plural form of lotus represents；
（5）According to step（4）Gained circulation complex power and the side bus average voltage of interconnection two calculate cyclization by formula
When cyclization steady-state current；
（6）By the impact coefficient and step of close-loop path（5）Gained cyclization steady-state current calculates cyclization punching during cyclization
Hit electric current；
The cyclization steady-state current is less than the maximum allowable operating current of interconnection and the cyclization dash current is less than excessively stream
Fast tripping protection trigger current, then perform Loop Closing Operation；Otherwise Loop Closing Operation is terminated.
Further, step of the present invention（2）, the equivalent impedance in the cyclization loop network is by obtaining cyclization annular
Main transformer, route parameter calculation in network are tried to achieve；Load on the side bus of interconnection two, can be by SCADA with complex representation
System call operator interfaces obtain, or are obtained by other metering systems.
Further, step of the present invention（3）The method for obtaining the complex power for flowing to interconnection bus is：After simplification
Equivalent circuit, list equation with the simplified loop method of analysis, solve equation i.e. available.
Further, step of the present invention（5）The step of calculating cyclization stable state circulation according to circulation complex power includes：According to
Circulation complex power calculates circulation apparent energy, and cyclization stable state circulation is calculated according to circulation apparent energy and busbar voltage.
Beneficial effects of the present invention：Due to having used techniques described above scheme, control method of the present invention is more defined
Really, simply, it is practical, it is easy to obtain data, it is not necessary to increase equipment, easy to implement, and precision and accuracy are higher, error is more
It is small, can based on, distribution network closed loop operation strong foundation is provided, power supply reliability can be effectively improved, reduce loss of outage, had very strong
Application value.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of power network cyclization control method of the present invention；
Fig. 2 is the kV interconnection schematic diagrames of two 220 kV transformer stations of embodiment 110；
Fig. 3 is the simplification equivalent circuit schematic diagram after the embodiment cyclization.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, so that those skilled in the art can be with
More fully understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The control method of power network cyclization of the present invention, comprises the following steps：
（1）It is assumed that whole network voltage is rated voltage, ignore admittance branch road, drawn according to power network cyclization network after simplifying
Equivalent circuit；
（2）Obtain the load on the equivalent impedance and the side bus of interconnection two in cyclization loop network；
（3）The characteristics of being distributed according to loop network trend, obtains the complex power for flowing to interconnection bus, and the complex power is used
The plural form of equivalent impedance and interconnection both sides bus load represents；
（4）The load for flowing out the bus is subtracted by the complex power for flowing to the side bus of interconnection one, obtains flowing through connection during cyclization
Circulation complex power during the complex power, i.e. cyclization of winding thread, the circulation complex power are born with equivalent impedance and the side bus of interconnection two
The plural form of lotus represents；
（5）According to step（4）Gained circulation complex power and the side bus average voltage of interconnection two calculate cyclization by formula
When cyclization steady-state current；
（6）By the impact coefficient and step of close-loop path（5）Gained cyclization steady-state current calculates cyclization punching during cyclization
Hit electric current；
The cyclization steady-state current is less than the maximum allowable operating current of interconnection and the cyclization dash current is less than excessively stream
Fast tripping protection trigger current, then perform Loop Closing Operation；Otherwise Loop Closing Operation is terminated.
Further, step of the present invention（2）, the equivalent impedance in the cyclization loop network is by obtaining cyclization annular
Main transformer, route parameter calculation in network are tried to achieve；Load on the side bus of interconnection two, can be by SCADA with complex representation
System call operator interfaces obtain, or are obtained by other metering systems.
Further, step of the present invention（3）The method for obtaining the complex power for flowing to interconnection bus is：After simplification
Equivalent circuit, list equation with the simplified loop method of analysis, solve equation i.e. available.
Further, step of the present invention（5）The step of calculating cyclization stable state circulation according to circulation complex power includes：According to
Circulation complex power calculates circulation apparent energy, and cyclization is calculated according to circulation apparent energy and with the side bus average voltage of interconnection two
Stable state circulation.
Embodiment：The situation of major network cyclization is told about by taking 110 kV interconnectors of two 220 kV transformer stations as an example.Such as Fig. 2
It is shown, 220 kV buses of two 220 kV transformer stations power supply points from same 500 kV transformer stations, two 220 kV power transformations
Station be two volume three become 110kV sides side by side, 35kV sides fanout operation, 35kV sides do not have outlet.
After 110 kV circuit cyclizations, electromagnetic looped network is formed, trend distribution meets loop network feature, it is assumed that whole network voltage is all
For rated voltage, ignore admittance branch road, draw the equivalent circuit after simplifying, as shown in figure 3, with the loop method of analysis, can the side of arranging
Journey：
（1）
（To flow through impedanceElectric current,For node, 2,3 Injection Current）
Again with the simplified loop method of analysis, that is, set electric currentDirect proportion is in the conjugate of complex power, or, equation（1）It can be converted into：
（2）Formula medium value impedanceIt can be tried to achieve by known main transformer, line parameter circuit value, interconnection both sides are female
Load on lineOperator interfaces can be dispatched by SCADA system to obtain, or obtained by other metering systems.
By solving equation（2）It can must flow through impedanceComplex power be respectively：
So, impedance is flowed throughComplex power：
It is the complex power for flowing through interconnection, as circulation complex power.
Then, circulation apparent energy can be tried to achieve by circulation complex power modulus：
（It can be represented with active power and reactive power）（6）
Then, cyclization steady-state current can be tried to achieve：
（For busbar voltage, the side bus average voltage of interconnection two can use）（7）
Impact coefficient can be tried to achieve with firstorder circuit zero state response relevant knowledge, or according to《Power engineering is electric
Design manual》（Electrical primary part）, take impact coefficientRecommendation is 1.80,=2.55, then cyclization impact electricity
Stream
（8）
WhenAnd（Stable state circulation is less than the maximum allowable operating current of interconnection and dash current is less than
Instantaneous over-current protects trigger current）, can perform Loop Closing Operation；Otherwise, Loop Closing Operation is terminated.
It is similar for the computational methods of distribution network closed loop steady-state current and dash current, the equivalent circuit one after simplifying
Sample, load current when should simply be superimposed open loop on interconnection,Acquisition methods it is identical, be power supply point to join
The equivalent impedance of the side bus of winding thread two.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure that bright specification and accompanying drawing content are made either equivalent flow conversion or to be used in other directly, indirectly related
Technical field, similarly it is included in the scope of patent protection of the present invention.
Claims (3)
1. a kind of control method of power network cyclization, it is characterised in that the control method comprises the following steps：
（1）It is assumed that whole network voltage is rated voltage, ignore admittance branch road, the equivalence after simplifying is drawn according to power network cyclization network
Circuit；
（2）Obtain the load on the equivalent impedance and the side bus of interconnection two in cyclization loop network；
（3）The characteristics of being distributed according to loop network trend, obtains the complex power for flowing to interconnection bus；Flow to interconnection side mother
The complex power of lineIt is formulated as,、、For in cyclization loop network
Equivalent impedance,、、Represent that equivalent impedance takes conjugate,、For the load plural number shape on the side bus of interconnection two
Formula；
（4）The load for flowing out the bus is subtracted by the complex power for flowing to the side bus of interconnection one, obtains flowing through interconnection during cyclization
Complex power, i.e. cyclization when circulation complex power：；
（5）According to step（4）When gained circulation complex power and the side bus average voltage of interconnection two calculate cyclization by formula
The step of cyclization steady-state current, includes：
Circulation apparent energy is calculated according to circulation complex power,With active power and idle work(
Rate represents；
Cyclization steady-state current is calculated according to circulation apparent energy and the side bus average voltage of interconnection two,Take connection
The side bus average voltage of winding thread two；
（6）By the impact coefficient and step of close-loop path（5）Gained cyclization steady-state current calculates cyclization impact electricity during cyclization
Stream；
The cyclization steady-state current is less than the maximum allowable operating current of interconnection and the cyclization dash current is less than instantaneous over-current
Trigger current is protected, then performs Loop Closing Operation；Otherwise Loop Closing Operation is terminated.
2. the control method of power network cyclization according to claim 1, it is characterised in that the step（2）,
Equivalent impedance in the cyclization loop network is asked by main transformer, the route parameter calculation obtained in cyclization loop network
；
Load on the side bus of interconnection two, with complex representation, obtained by SCADA system scheduling operator interfaces, or pass through it
Its metering system obtains.
3. the control method of power network cyclization according to claim 1, it is characterised in that the step（3）Obtain flow direction contact
The method of the complex power of line bus is：
According to the equivalent circuit after simplification, equation is listed with the simplified loop method of analysis, is solved equation i.e. available.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904671.5A CN105552882B (en) | 2015-12-09 | 2015-12-09 | A kind of control method of power network cyclization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904671.5A CN105552882B (en) | 2015-12-09 | 2015-12-09 | A kind of control method of power network cyclization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105552882A CN105552882A (en) | 2016-05-04 |
| CN105552882B true CN105552882B (en) | 2018-03-27 |
Family
ID=55831896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510904671.5A Active CN105552882B (en) | 2015-12-09 | 2015-12-09 | A kind of control method of power network cyclization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105552882B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958484B (en) * | 2016-06-02 | 2019-10-25 | 国网北京市电力公司 | Transformer cyclization control circuit and transformer cyclization control method and device |
| CN107492890B (en) * | 2017-10-23 | 2019-02-15 | 云南电网有限责任公司临沧供电局 | A kind of cyclization turns the calculation method of power supply control parameter |
| CN107689630A (en) * | 2017-10-31 | 2018-02-13 | 合肥天鹰高科技有限公司 | A kind of electromagnetism cyclization management method |
| CN109347091B (en) * | 2018-10-10 | 2021-10-01 | 云南电网有限责任公司瑞丽供电局 | Method and device for judging ring closing and opening feasibility of rapid power distribution network |
| CN109449945B (en) * | 2018-11-22 | 2020-11-24 | 国网四川省电力公司天府新区供电公司 | 10kV loop closing current constraint power distribution network transfer optimization method based on DG (distributed generation) adjustment |
| CN110417001B (en) * | 2019-07-08 | 2022-11-04 | 云南电网有限责任公司红河供电局 | 10kV power distribution network tie line loop closing and power transferring method |
| CN110912138A (en) * | 2019-12-05 | 2020-03-24 | 云南电网有限责任公司红河供电局 | Distribution network loop closing control method |
| CN110912139A (en) * | 2019-12-05 | 2020-03-24 | 云南电网有限责任公司红河供电局 | Control method for closed-loop operation of medium-high voltage power grid |
| CN111952970B (en) * | 2020-08-17 | 2024-03-19 | 云南电网有限责任公司电力科学研究院 | Method and device for closing loop and regulating electricity of power distribution network |
| CN112531717B (en) * | 2020-12-09 | 2023-07-21 | 深圳供电局有限公司 | Method and device for calculating loop closing power flow of power system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6051893A (en) * | 1998-10-29 | 2000-04-18 | Mitsubishi Denki Kabushiki Kaisha | Electric power supply system for load |
| CN101908763B (en) * | 2010-07-23 | 2012-11-21 | 广东电网公司中山供电局 | Method for controlling distribution network closed loop |
| CN102868227B (en) * | 2012-10-07 | 2015-05-06 | 国家电网公司 | Medium voltage distribution-network looped-network switching operation method |
| 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 |
| CN104659779B (en) * | 2015-03-05 | 2017-01-25 | 华北电力大学 | Method for selecting power exchange connection modes for sub-areas in power grid |
-
2015
- 2015-12-09 CN CN201510904671.5A patent/CN105552882B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105552882A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105552882B (en) | A kind of control method of power network cyclization | |
| CN105429137B (en) | The method that distribution network closed loop turns power supply | |
| CN108110739B (en) | A kind of distribution network line protection definite value check algorithm | |
| Bokhari et al. | Combined effect of CVR and DG penetration in the voltage profile of low-voltage secondary distribution networks | |
| Izadkhast et al. | An aggregate model of plug-in electric vehicles including distribution network characteristics for primary frequency control | |
| Han et al. | An automated impedance estimation method in low-voltage distribution network for coordinated voltage regulation | |
| CN109103879B (en) | Full-dimensional power distribution network closed-loop evaluation method | |
| WO2014089959A1 (en) | Dynamic equivalence method for ac/dc hybrid large power grid based on engineering application | |
| CN108304613A (en) | Closed loop network powered operation methods of risk assessment | |
| CN106849302B (en) | A kind of three-level formula radio energy transmission system for electric vehicle | |
| CN103746368A (en) | Method of optimizing static safe and stable operation limit of electric power system | |
| CN109449945A (en) | Power distribution network based on the DG 10kV Alloy White Iron constraint adjusted turns for optimization method | |
| CN102510010A (en) | Method for checking and testing relay protection vector before operation of newly-built transformer station | |
| CN107732917A (en) | A kind of closed loop network turns power supply Load flow calculation optimization method | |
| CN110912138A (en) | Distribution network loop closing control method | |
| CN109038604A (en) | Analysis method for direct current transmission mechanism of STATCOM access receiving end weak alternating current system | |
| CN111211574A (en) | Method for calculating bipolar fault current on direct current side of multi-terminal direct current power grid based on half-bridge type MMC | |
| CN108879695A (en) | A kind of foundation and calculation method of DC flow model | |
| CN110311399A (en) | A kind of determination method and device of flexible direct current contribution current in the short | |
| Laaksonen et al. | New functionalities and features of ieds to realize active control and protection of smart grids | |
| CN105656086B (en) | Overload processing method | |
| Laaksonen | IED functionalities fulfilling future smart grid requirements | |
| CN110417001B (en) | 10kV power distribution network tie line loop closing and power transferring method | |
| CN104410071A (en) | 35KV high voltage distribution network loop-closing and loop-opening current estimation method | |
| CN106911143B (en) | It is a kind of suitable for extra-high voltage direct-current locking after Inverter Station modeling power method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |