CN105552882A - Power grid loop-closing control method - Google Patents

Power grid loop-closing control method Download PDF

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Publication number
CN105552882A
CN105552882A CN201510904671.5A CN201510904671A CN105552882A CN 105552882 A CN105552882 A CN 105552882A CN 201510904671 A CN201510904671 A CN 201510904671A CN 105552882 A CN105552882 A CN 105552882A
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Prior art keywords
cyclization
loop
interconnection
current
network
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CN201510904671.5A
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CN105552882B (en
Inventor
张磊
时雨
陈志坚
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Honghe Power Supply Bureau of Yunnan Power Grid Co Ltd
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Honghe Power Supply Bureau of Yunnan Power Grid Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Abstract

The invention discloses a power grid loop-closing control method which comprises the following main steps: drawing a simplified equivalent circuit according to a power grid loop-closing network; acquiring the equivalent impedance in the loop-closing ring network and the loads on buses on the two sides of a tie line; working out the complex power flowing to the tie line buses according to the characteristics of the ring network; subtracting the load flowing out of the bus on one side of the tie line from the complex power flowing to the bus to get circular complex power; calculating the loop-closing steady-state current and loop-closing impact current based on the circular complex power; and comparing the loop-closing steady-state current with the maximum allowable work current of the tie line and comparing the loop-closing impact current with the over-current quick-break protection trigger current, and judging whether loop-closing operation can be performed. The method of the invention is simple and practical, safe and reliable, and applicable to loop-closing operation of both the main network and the distribution network, and can provide a basis for power grid loop-closing operation and help power dispatchers to make reasonable and beneficial adjustment on the power grid operation mode through loop closing so as to improve the reliability of power supply and guarantee the interests of users.

Description

A kind of control method of electrical network cyclization
Technical field
The present invention relates to electrical network cyclization technical field, particularly relate to a kind of control method of electrical network cyclization.
Background technology
Along with developing rapidly of economy, more and more higher to the requirement of power supply reliability, the interconnection in electrical network between different substation is that load transfer and adjust operation mode are provided convenience, and optimizing and revising power system operating mode by cyclization effectively can improve power supply reliability.But unfavorable Loop Closing Operation can produce excessive Alloy White Iron, cause protection act to trip, expand power failure area.The Loop Closing Operation of major network, mostly with the experiential operating of dispatcher, is based on insufficient grounds, there is risk; The Loop Closing Operation prior art of distribution is still immature, or calculation of complex or accuracy not high, be still that traditional power failure turns confession mostly, cyclization turn for utility ratio low.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the above defect, provides a kind of control method calculating electrical network cyclization accurate, easy and simple to handle, provides foundation, effectively improve power supply reliability for power dispatcher carries out main, distribution network closed loop operation.
In order to solve the above technical problem, the control method of electrical network cyclization of the present invention, comprises the following steps:
(1) suppose that the whole network voltage is rated voltage, ignore admittance branch road, draw the equivalent circuit after simplification according to electrical network cyclization network;
(2) equivalent impedance in cyclization loop network and the load on interconnection two side bus is obtained;
(3) according to the feature of loop network trend distribution, obtain the complex power flowing to interconnection bus, the described complex power plural form of equivalent impedance and interconnection both sides bus load represents;
(4) load flowing out this bus is deducted by the complex power flowing to interconnection one side bus, the complex power of interconnection is flow through when obtaining cyclization, namely circulation complex power during cyclization, the described circulation complex power plural form of equivalent impedance and interconnection both sides bus load represents;
(5) cyclization steady-state current when going out cyclization according to step (4) gained circulation complex power and interconnection two side bus average voltage by formulae discovery;
(6) cyclization impulse current when calculating cyclization by the impact coefficient of close-loop path and step (5) gained cyclization steady-state current;
Described cyclization steady-state current is less than interconnection maximum permission operating current and described cyclization impulse current is less than instantaneous over-current protection trigger current, then perform Loop Closing Operation; Otherwise termination Loop Closing Operation.
Further, step of the present invention (2), the equivalent impedance in described cyclization loop network is tried to achieve by the main transformer in acquisition cyclization loop network, route parameter calculation; Load on described interconnection two side bus, with complex representation, can be obtained by SCADA system dispatcher interface, or be obtained by other metering system.
Further, the method that step of the present invention (3) obtains the complex power flowing to interconnection bus is: according to the equivalent circuit after simplification, lists equation, solve an equation and can obtain by the loop method of analysis simplified.
Further, the step that step of the present invention (5) calculates cyclization stable state circulation according to circulation complex power comprises: calculate circulation apparent power according to circulation complex power, calculates cyclization stable state circulation according to circulation apparent power and busbar voltage.
Beneficial effect of the present invention: owing to employing the above technical scheme, control method of the present invention is more accurate, simple, practical, acquisition data are easy, do not need increase equipment, easy to implement, and precision and accuracy higher, error is less, can be master, distribution network closed loop operation provides strong foundation, effectively can improve power supply reliability, reduce loss of outage, there is very strong using value.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of electrical network cyclization control method of the present invention;
Fig. 2 is described embodiment Liang Ge 220kV transformer station 110kV interconnection schematic diagram;
Fig. 3 is the simplification equivalent circuit schematic diagram after described embodiment cyclization.
Embodiment
Be described in further detail the present invention below in conjunction with drawings and Examples, to make those skilled in the art the present invention may be better understood and can be implemented, but illustrated embodiment is not as a limitation of the invention.
The control method of electrical network cyclization of the present invention, comprises the following steps:
(1) suppose that the whole network voltage is rated voltage, ignore admittance branch road, draw the equivalent circuit after simplification according to electrical network cyclization network;
(2) equivalent impedance in cyclization loop network and the load on interconnection two side bus is obtained;
(3) according to the feature of loop network trend distribution, obtain the complex power flowing to interconnection bus, the described complex power plural form of equivalent impedance and interconnection both sides bus load represents;
(4) load flowing out this bus is deducted by the complex power flowing to interconnection one side bus, the complex power of interconnection is flow through when obtaining cyclization, namely circulation complex power during cyclization, the described circulation complex power plural form of equivalent impedance and interconnection both sides bus load represents;
(5) cyclization steady-state current when going out cyclization according to step (4) gained circulation complex power and interconnection two side bus average voltage by formulae discovery;
(6) cyclization impulse current when calculating cyclization by the impact coefficient of close-loop path and step (5) gained cyclization steady-state current;
Described cyclization steady-state current is less than interconnection maximum permission operating current and described cyclization impulse current is less than instantaneous over-current protection trigger current, then perform Loop Closing Operation; Otherwise termination Loop Closing Operation.
Further, step of the present invention (2), the equivalent impedance in described cyclization loop network is tried to achieve by the main transformer in acquisition cyclization loop network, route parameter calculation; Load on described interconnection two side bus, with complex representation, can be obtained by SCADA system dispatcher interface, or be obtained by other metering system.
Further, the method that step of the present invention (3) obtains the complex power flowing to interconnection bus is: according to the equivalent circuit after simplification, lists equation, solve an equation and can obtain by the loop method of analysis simplified.
Further, the step that step of the present invention (5) calculates cyclization stable state circulation according to circulation complex power comprises: calculate circulation apparent power according to circulation complex power, according to circulation apparent power and and interconnection two side bus average voltage calculating cyclization stable state circulation.
Embodiment: the situation telling about major network cyclization for the 110kV interconnector of Liang Ge 220kV transformer station.As shown in Figure 2, Liang Zuo 220kV transformer station power supply point from the 220kV bus of same 500kV transformer station, Liang Ge 220kV transformer station be two three volumes become 110kV sides side by side, 35kV side fanout operation, 35kV side does not have outlet.
After the cyclization of 110kV circuit, form electromagnetic looped network, trend distribution meets loop network feature, assuming that the whole network voltage is all rated voltage, ignores admittance branch road, draws the equivalent circuit after simplification, as shown in Figure 3, uses the loop method of analysis, can establish an equation:
(1)
( for flowing through impedance electric current, for node, the Injection Current of 2,3)
Use the loop method of analysis of simplification again, namely establish electric current direct proportion is in the conjugate of complex power , or , equation (1) can be converted into:
(2) formula medium value impedance , , can be tried to achieve by known main transformer, line parameter circuit value, the load on interconnection two side bus , can be obtained by SCADA system dispatcher interface, or be obtained by other metering system.
By solving an equation, (2) can flow through impedance , complex power be respectively:
So, impedance is flowed through complex power:
be the complex power flowing through interconnection, be circulation complex power.
Then, circulation apparent power is tried to achieve by circulation complex power delivery:
( available active power and reactive power represent ) (6)
So, cyclization steady-state current can be tried to achieve:
( for busbar voltage, desirable interconnection two side bus average voltage) (7)
Firstorder circuit zero state response relevant knowledge is used to try to achieve impact coefficient , or according to " power engineering electrical design handbook " (electrical primary part), get impact coefficient recommendation is 1.80, =2.55, so cyclization impulse current
(8)
When and (stable state circulation is less than the maximum permission operating current of interconnection and impulse current is less than instantaneous over-current protection trigger current), can perform Loop Closing Operation; Otherwise, stop Loop Closing Operation.
Computational methods for distribution network closed loop steady-state current and impulse current are similar, and the equivalent circuit after simplification is the same, load current when just should superpose open loop on interconnection, acquisition methods identical, for power supply point is to the equivalent impedance of interconnection two side bus.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or directly, be indirectly used in other correlative technology fields, be all in like manner included in scope of patent protection of the present invention.

Claims (4)

1. a control method for electrical network cyclization, is characterized in that, described control method comprises the following steps:
(1) suppose that the whole network voltage is rated voltage, ignore admittance branch road, draw the equivalent circuit after simplification according to electrical network cyclization network;
(2) equivalent impedance in cyclization loop network and the load on interconnection two side bus is obtained;
(3) according to the feature of loop network trend distribution, the complex power flowing to interconnection bus is obtained;
(4) deducted the load flowing out this bus by the complex power flowing to interconnection one side bus, flow through the complex power of interconnection when obtaining cyclization, the circulation complex power namely during cyclization;
(5) cyclization steady-state current when going out cyclization according to step (4) gained circulation complex power and interconnection two side bus average voltage by formulae discovery;
(6) cyclization impulse current when calculating cyclization by the impact coefficient of close-loop path and step (5) gained cyclization steady-state current;
Described cyclization steady-state current is less than interconnection maximum permission operating current and described cyclization impulse current is less than instantaneous over-current protection trigger current, then perform Loop Closing Operation; Otherwise termination Loop Closing Operation.
2. the control method of electrical network cyclization according to claim 1, is characterized in that, described step (2),
Equivalent impedance in described cyclization loop network is tried to achieve by the main transformer in acquisition cyclization loop network, route parameter calculation;
Load on described interconnection two side bus, with complex representation, can be obtained by SCADA system dispatcher interface, or be obtained by other metering system.
3. the control method of electrical network cyclization according to claim 1, is characterized in that, the method that described step (3) obtains the complex power flowing to interconnection bus is:
According to the equivalent circuit after simplification, list equation by the loop method of analysis simplified, solve an equation and can obtain.
4. the control method of electrical network cyclization according to claim 1, is characterized in that, the step that described step (5) calculates cyclization stable state circulation according to circulation complex power and interconnection two side bus average voltage comprises:
Circulation apparent power is calculated according to circulation complex power;
According to circulation apparent power and and interconnection two side bus average voltage calculating cyclization stable state circulation.
CN201510904671.5A 2015-12-09 2015-12-09 A kind of control method of power network cyclization Active CN105552882B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958484A (en) * 2016-06-02 2016-09-21 国网北京市电力公司 Transformer loop closing control circuit, and transformer loop closing control method and apparatus
CN107492890A (en) * 2017-10-23 2017-12-19 云南电网有限责任公司临沧供电局 A kind of cyclization turns the computational methods 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
CN109347091A (en) * 2018-10-10 2019-02-15 云南电网有限责任公司瑞丽供电局 Quick power distribution network closes unlink feasibility judgment method and device
CN109449945A (en) * 2018-11-22 2019-03-08 国网四川省电力公司天府新区供电公司 Power distribution network based on the DG 10kV Alloy White Iron constraint adjusted turns for optimization method
CN110417001A (en) * 2019-07-08 2019-11-05 云南电网有限责任公司红河供电局 A kind of method that 10kV power distribution network interconnection cyclization turns electricity
CN112531717A (en) * 2020-12-09 2021-03-19 深圳供电局有限公司 Method and device for calculating closed loop power flow of power system

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CN101908763A (en) * 2010-07-23 2010-12-08 广东电网公司中山供电局 Method for controlling distribution network closed loop
CN102868227A (en) * 2012-10-07 2013-01-09 河南省电力公司南阳供电公司 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
CN104659779A (en) * 2015-03-05 2015-05-27 华北电力大学 Method for selecting power exchange connection modes for sub-areas in power grid

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US6051893A (en) * 1998-10-29 2000-04-18 Mitsubishi Denki Kabushiki Kaisha Electric power supply system for load
CN101908763A (en) * 2010-07-23 2010-12-08 广东电网公司中山供电局 Method for controlling distribution network closed loop
CN102868227A (en) * 2012-10-07 2013-01-09 河南省电力公司南阳供电公司 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
CN104659779A (en) * 2015-03-05 2015-05-27 华北电力大学 Method for selecting power exchange connection modes for sub-areas in power grid

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958484A (en) * 2016-06-02 2016-09-21 国网北京市电力公司 Transformer loop closing control circuit, and transformer loop closing control method and apparatus
CN107492890A (en) * 2017-10-23 2017-12-19 云南电网有限责任公司临沧供电局 A kind of cyclization turns the computational methods 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
CN109347091A (en) * 2018-10-10 2019-02-15 云南电网有限责任公司瑞丽供电局 Quick power distribution network closes unlink feasibility judgment method and device
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
CN109449945A (en) * 2018-11-22 2019-03-08 国网四川省电力公司天府新区供电公司 Power distribution network based on the DG 10kV Alloy White Iron constraint adjusted turns for optimization method
CN110417001A (en) * 2019-07-08 2019-11-05 云南电网有限责任公司红河供电局 A kind of method that 10kV power distribution network interconnection cyclization turns electricity
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
CN112531717A (en) * 2020-12-09 2021-03-19 深圳供电局有限公司 Method and device for calculating closed loop power flow of power system

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