CN109119967B - It is a kind of to consider multifactor power plant's outlet reclosure time setting method and device - Google Patents
It is a kind of to consider multifactor power plant's outlet reclosure time setting method and device Download PDFInfo
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- CN109119967B CN109119967B CN201811197074.3A CN201811197074A CN109119967B CN 109119967 B CN109119967 B CN 109119967B CN 201811197074 A CN201811197074 A CN 201811197074A CN 109119967 B CN109119967 B CN 109119967B
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- time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The present invention, which discloses, a kind of considers multifactor power plant outlet reclosure time setting method and device; by comprehensively considering under single-phase fault reclosing movement under the decaying of secondary arc current, permanent fault to generator secondary pulse, reclosing and the influence mutually to be protected for the factors such as cooperating, the optimal reclosure time of power plant's outlet is determined.The present invention can adjust for power plant outlet reclosing optimal time and provide technical support, improve the stability of system, ensure that the submitting ability of power plant.
Description
Technical field
The present invention relates to power system and automation technologies, especially a kind of to consider multifactor power plant's outlet weight
Closing time setting method and device.
Background technique
Most of failures in electric system are transient fault, and system power supply can be improved using automatic reclosing
Reliability.For permanent fault, reclosing device movement can cause the second Secondary Shocks to power equipment, to avoid coinciding with forever
Long harm of the property failure to equipment and system, scholars have carried out the research of adaptive reclosing theory.
Reclosure time adjusting at present mainly considers following factor: protecting asynchronous trip time, protection in route two sides
Fault point arc extinction time, fault point insulator recovery time, breaker arc extinguishing and trip time and certain again after tripping
Time margin.Research shows that reclosure time has larger impact to power system transient stability, especially according to existing electricity
Force system bears the safety and stability standard of large disturbances ability, and power plant sends out route and occurs to take measures when three-phase fault, and single
N-1 requirement should be met when phase permanent fault, therefore power plant sends out whether the circuit re-switching time may rationally directly affect electricity
Factory sends out ability.
Traditional reclosure time adjusting relies primarily on the empirically determined reclosure time of designer, does not consider permanent
Reclosing is carried out to the secondary pulse of generator's power and angle in action process when generator's power and angle amplitude of fluctuation is larger under failure
It is overlapped failure, the increasing for be easy to causeing generator's power and angle to swing even unstability.
Summary of the invention
The object of the present invention is to propose it is a kind of consider multifactor power plant's outlet reclosure time setting method, solve hair
The optimal reclosure time problem of tuning of power plant's outlet improves power plant angle stability when reclosing is overlapped with permanent fault
Property.
The technical scheme adopted by the invention is as follows: it is a kind of to consider multifactor power plant's outlet reclosure time setting method, packet
It includes:
Maximum secondary arc current when single-phase fault occurs for simulation calculation power plant outlet circuit setting position；
Based on the maximum secondary arc current and preset secondary arc current size and attenuation relation formula, secondary arc current is calculated
Decay to 0 time t1；Defining optimal reclosing time under transient fault is tc1=t1+Δt1, Δ t1For peace of preset time
Full nargin；
When single-phase fault occurs for setting position described in simulation calculation, the smallest reclosure time is influenced on generator's power and angle
t2；Defining the optimal reclosing time under permanent fault is tc2=t2；
All protections and its operating time of protection definite value with the cooperation of setting position failure reclosing described in route are obtained, are obtained
The shortest operating time of protection t into all protections3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=
t3-Δt2, Δ t2For preset time safety margin；
According to tc1、tc2And tc3Between size relation, determine circuit setting position occur single-phase fault when optimal coincidence
Lock time T, so that Reclosing Instant fault point electric arc has extinguished, and generator operates normally after reclosing movement.
The present invention is according to tc1、tc2And tc3Between size relation determine final optimal reclosure time, that is, comprehensively consider
Protection factor joined together by transient fault factor, permanent fault factor and setting position failure reclosing, it can be ensured that
Power plant, with power-angle stability when permanent fault, avoids reclosing reclosing failure, avoids in transient fault reclosing
Generator's power and angle significantly vibrates even unstability.
Preferably, the present invention calculates maximum when single-phase fault occurs for power plant's outlet circuit setting position by time-domain-simulation
Secondary arc current and generator's power and angle curve, and it is based on generator's power and angle curve, it is calculated using law of equal areas to power generation
Machine generator rotor angle influences the smallest reclosure time.
Preferably, the preset secondary arc current size and attenuation relation formula are as follows:
T=0.25 (0.1I+1) (1)
Above-mentioned relation formula is the secondary arc current size and decaying rule-of-thumb relation of Electric Power Research Institute, former Soviet Union research.
Preferably, the smallest reclosure time is influenced on generator's power and angle are as follows: in the case of not considering reclosing, cut from failure
From the moment, generator's power and angle reaches the time span of minimum point for the first time.
It preferably, include: the protection of generator negative sequence overcurrent with the protection of circuit setting position failure reclosing cooperation, main
The zero sequence direction overcurrent protection for becoming zero-sequence over-current protection, breaker three phases un identical protection and longitudinal differential protection system, according to route
The protection of actual setting determines.
Preferably, comprehensively consider transient fault factor, permanent fault factor and setting position failure reclosing institute
The protection factor of cooperation, when single-phase fault occurs for circuit setting position, optimal reclosure time are as follows:
The determination formula of the above optimal reclosure time has comprehensively considered secondary arc current decaying when transient fault, forever
Influence and reclosing and other protections of the secondary pulse caused by being acted when long property failure due to reclosing to generator's power and angle
The influence matched finally obtains the optimal reclosure time of the route.
Multifactor power plant's outlet reclosure time setting device is considered the invention also includes a kind of, comprising:
Maximum secondary arc current computing module, when for simulation calculation power plant outlet circuit setting position generation single-phase fault
Maximum secondary arc current；
Consider the optimal reclosing time computing module of transient fault, is used for based on the maximum secondary arc current, and
Preset secondary arc current size and attenuation relation formula calculate the time t that secondary arc current decays to 01；It defines under transient fault most
Good reclosure time is tc1=t1+Δt1, Δ t1For preset time safety margin；
The optimal reclosing time computing module for considering permanent fault occurs single for setting position described in simulation calculation
When phase fault, the smallest reclosure time t is influenced on generator's power and angle2；Define the optimal reclosing time under permanent fault
For tc2=t2；
The reclosing optimal reclosing time determining module joined together protected is considered, for obtaining and setting position described in route
All protections and its operating time of protection definite value for setting the cooperation of failure reclosing, when obtaining shortest protection act in all protections
Between t3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=t3-Δt2, Δ t2It is abundant safely for the preset time
Degree；
Multifactor optimal reclosing determining module is comprehensively considered, for according to tc1、tc2And tc3Between size relation,
Optimal reclosure time T when single-phase fault occurs for circuit setting position is determined, so that Reclosing Instant fault point electric arc is
Extinguish, and generator operates normally after reclosing movement.
Preferably, comprehensively consider the optimal reclosure time that multifactor optimal reclosing determining module determines are as follows:
Beneficial effect
The present invention determines optimal reclosure time after comprehensively considering each factor, can ensure: when transient fault occurs, root
Reclosure time is determined according to secondary arc current attenuation characteristic；When permanent fault occurs, acted according to reclosing to secondary system
Impact, determines the smallest reclosure time of generator's power and angle oscillation amplitude；Optimal reclosure time is joined together by the reclosing simultaneously
Other protection equipment protection actuation times constraint under.And then power plant can be ensured when reclosing is overlapped with permanent fault
Power-angle stability avoids generator's power and angle from significantly vibrating even unstability, ensures that the electric power of power plant's outlet route sends out ability.
Detailed description of the invention
Fig. 1 show a kind of method flow schematic diagram of specific embodiment of the present invention；
Generator's power and angle curve after Fig. 2 show power plant's outlet generation single-phase fault, after 0.1s cuts off faulty line
Schematic diagram.
Specific embodiment
It is further described below in conjunction with the drawings and specific embodiments.
Embodiment 1
The present embodiment considers multifactor power plant's outlet reclosure time setting method to be a kind of, comprising:
Maximum secondary arc current when single-phase fault occurs for simulation calculation power plant outlet circuit setting position；
Based on the maximum secondary arc current and preset secondary arc current size and attenuation relation formula, secondary arc current is calculated
Decay to 0 time t1；Defining optimal reclosing time under transient fault is tc1=t1+Δt1, Δ t1For peace of preset time
Full nargin；
When single-phase fault occurs for setting position described in simulation calculation, the smallest reclosure time is influenced on generator's power and angle
t2；Defining the optimal reclosing time under permanent fault is tc2=t2；
All protections and its operating time of protection definite value with the cooperation of setting position failure reclosing described in route are obtained, are obtained
The shortest operating time of protection t into all protections3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=
t3-Δt2, Δ t2For preset time safety margin；
According to tc1、tc2And tc3Between size relation, determine circuit setting position occur single-phase fault when optimal coincidence
Lock time T, so that Reclosing Instant fault point electric arc has extinguished, and generator operates normally after reclosing movement.
The present embodiment is according to tc1、tc2And tc3Between size relation determine final optimal reclosure time, i.e. synthesis is examined
Consider protection factor joined together by transient fault factor, permanent fault factor and setting position failure reclosing, it can be true
Power plant is protected in transient fault reclosing with power-angle stability when permanent fault, reclosing reclosing failure is avoided, keeps away
Exempt from generator's power and angle and significantly vibrates even unstability.
The preset time safety margin can be empirical value, however not excluded that the case where value is 0.
The present embodiment calculates the latent confession of maximum when single-phase fault occurs for power plant's outlet circuit setting position by time-domain-simulation
Electric current and generator's power and angle curve, and it is based on generator's power and angle curve, it is calculated using law of equal areas to generator function
Angle influences the smallest reclosure time.
The preset secondary arc current size and attenuation relation formula are as follows:
T=0.25 (0.1I+1) (1)
Above-mentioned relation formula is the secondary arc current size and decaying rule-of-thumb relation of Electric Power Research Institute, former Soviet Union research.
The smallest reclosure time is influenced on generator's power and angle are as follows: in the case of not considering reclosing, from the failure removal moment
It rises, generator's power and angle reaches the time span of minimum point for the first time.
Protection with the cooperation of circuit setting position failure reclosing includes: the protection of generator negative sequence overcurrent, main transformer zero sequence
The zero sequence direction overcurrent protection of overcurrent protection, breaker three phases un identical protection and longitudinal differential protection system is set according to route is practical
The protection set determines.
Comprehensively consider guarantor joined together by transient fault factor, permanent fault factor and setting position failure reclosing
Shield factor, when single-phase fault occurs for circuit setting position, optimal reclosure time are as follows:
The determination formula of the above optimal reclosure time has comprehensively considered secondary arc current decaying when transient fault, forever
Influence and reclosing and other protections of the secondary pulse caused by being acted when long property failure due to reclosing to generator's power and angle
The influence matched finally obtains the optimal reclosure time of the route.
Embodiment 2
The present embodiment is based on embodiment 1, detailed to the power plant outlet reclosure time setting method progress for considering multifactor
Thin description.
The specific implementation process of the present embodiment is with reference to shown in Fig. 1:
By taking certain capacity is the outlet of 2*660MW power plant as an example, power plant goes out 7.3 km of line length, is computed under single-phase fault most
Big secondary arc current is 4.34A, decays empirical equation calculating it is found that latent power supply by Electric Power Research Institute, former Soviet Union secondary arc current
Stream, which decays to 0, about needs used time 0.36s, considers the safety margin of 0.2s, considers reclosure time t when secondary arc currentc1For
0.56s；
T=0.25 (0.1I+1) (1)
With reference to the generator's power and angle song that Fig. 2 is after single-phase fault occurs for power plant's outlet, after 0.1s cuts off faulty line
Line, by being analyzed with law of equal areas power-angle curve it is found that when generator's power and angle curve swings to minimum point for the first time
It is best to generator's power and angle stability to carry out reclosing, the time is about 0.8s after failure removal as seen from the figure, then considers permanent
Failure does not influence the optimal reclosing time t of generator operationc2It can be 0.8s.
Following table is the protection cooperated with the circuit re-switching:
| With the protection of reclosing cooperation | The protection seting time |
| The protection of generator negative sequence overcurrent | 2s |
| Main transformer zero-sequence over-current protection | I section of protection 5s, II section of protection 4.5s |
| Breaker three phases un identical protection | 3.5s |
| The zero sequence direction overcurrent protection of longitudinal differential protection system | It is out of service during reclosing |
It is 2s by table visible protection most short actuation time, the safety margin of 0.2s is considered, under consideration and other protection cooperations
Reclosure time be tc3=1.8s；
Three time values that will acquire bring formula (2) into, and obtaining the optimal reclosure time of the route is 0.8s.
Embodiment 3
The present embodiment considers multifactor power plant's outlet reclosure time setting device to be a kind of, comprising:
Maximum secondary arc current computing module, when for simulation calculation power plant outlet circuit setting position generation single-phase fault
Maximum secondary arc current；
Consider the optimal reclosing time computing module of transient fault, is used for based on the maximum secondary arc current, and
Preset secondary arc current size and attenuation relation formula calculate the time t that secondary arc current decays to 01；It defines under transient fault most
Good reclosure time is tc1=t1+Δt1, Δ t1For preset time safety margin；
The optimal reclosing time computing module for considering permanent fault occurs single for setting position described in simulation calculation
When phase fault, the smallest reclosure time t is influenced on generator's power and angle2；Define the optimal reclosing time under permanent fault
For tc2=t2；
The reclosing optimal reclosing time determining module joined together protected is considered, for obtaining and setting position described in route
All protections and its operating time of protection definite value for setting the cooperation of failure reclosing, when obtaining shortest protection act in all protections
Between t3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=t3-Δt2, Δ t2It is abundant safely for the preset time
Degree；
Multifactor optimal reclosing determining module is comprehensively considered, according to tc1、tc2And tc3Between size relation, determine
Optimal reclosure time T when single-phase fault occurs for circuit setting position, so that Reclosing Instant fault point electric arc has extinguished,
And generator operates normally after reclosing movement.
Comprehensively consider the optimal reclosure time that multifactor optimal reclosing determining module determines are as follows:
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (8)
1. a kind of consider multifactor power plant's outlet reclosure time setting method, characterized in that include:
Maximum secondary arc current when single-phase fault occurs for simulation calculation power plant outlet circuit setting position；
Based on the maximum secondary arc current and preset secondary arc current size and attenuation relation formula, secondary arc current decaying is calculated
To 0 time t1；Defining optimal reclosing time under transient fault is tc1=t1+Δt1, Δ t1It is abundant safely for the preset time
Degree；
When single-phase fault occurs for setting position described in simulation calculation, the smallest reclosure time t is influenced on generator's power and angle2；Definition
Optimal reclosing time under permanent fault is tc2=t2；
All protections and its operating time of protection definite value with the cooperation of setting position failure reclosing described in route are obtained, institute is obtained
There is shortest operating time of protection t in protection3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=t3-Δ
t2, Δ t2For preset time safety margin；
According to tc1、tc2And tc3Between size relation, determine circuit setting position occur single-phase fault when optimal reclosing when
Between T so that Reclosing Instant fault point electric arc has extinguished, and generator operates normally after reclosing movement.
2. according to the method described in claim 1, it is characterized in that, pass through time-domain-simulation calculate power plant's outlet circuit setting position hair
Maximum secondary arc current and generator's power and angle curve when raw single-phase fault, and it is based on generator's power and angle curve, utilize homalographic
Rule, which is calculated, influences the smallest reclosure time to generator's power and angle.
3. according to the method described in claim 1, it is characterized in that, the preset secondary arc current size and attenuation relation formula are as follows:
T=0.25 (0.1I+1) (1)
In formula, t is the time that secondary arc current decays to 0, and I is secondary arc current value.
4. method according to claim 1 or 2, characterized in that influence the smallest reclosure time to generator's power and angle are as follows:
In the case of not considering reclosing, from the failure removal moment, generator's power and angle reaches the time span of minimum point for the first time.
5. according to the method described in claim 1, it is characterized in that, with circuit setting position failure reclosing cooperation protection packet
It includes: the protection of generator negative sequence overcurrent, main transformer zero-sequence over-current protection, breaker three phases un identical protection and longitudinal differential protection system
Zero sequence direction overcurrent protection.
6. according to the method described in claim 1, it is characterized in that, comprehensively consider transient fault factor, permanent fault factor
And protection factor joined together by the failure reclosing of setting position, when single-phase fault occurs for circuit setting position, optimal reclosing
Time are as follows:
7. a kind of consider multifactor power plant's outlet reclosure time setting device, characterized in that include:
Maximum when single-phase fault occurs for simulation calculation power plant outlet circuit setting position for maximum secondary arc current computing module
Secondary arc current；
Consider the optimal reclosing time computing module of transient fault, is used for based on the maximum secondary arc current, and preset
Secondary arc current size and attenuation relation formula, calculate secondary arc current decay to 0 time t1；It defines most preferably heavy under transient fault
Closing time is tc1=t1+Δt1, Δ t1For preset time safety margin；
For setting position described in simulation calculation single-phase event occurs for the optimal reclosing time computing module for considering permanent fault
When barrier, the smallest reclosure time t is influenced on generator's power and angle2；Defining the optimal reclosing time under permanent fault is tc2
=t2；
The optimal reclosing time determining module protected joined together by reclosing is considered, for obtaining and the event of setting position described in route
All protections and its operating time of protection definite value for hindering reclosing cooperation, obtain shortest operating time of protection in all protections
t3, it is t that definition, which considers to protect the optimal reclosing time of equipment cooperation,c3=t3-Δt2, Δ t2For preset time safety margin；
Multifactor optimal reclosing determining module is comprehensively considered, for according to tc1、tc2And tc3Between size relation, determine
Optimal reclosure time T when single-phase fault occurs for circuit setting position, so that Reclosing Instant fault point electric arc has extinguished,
And generator operates normally after reclosing movement.
8. according to claim 7 consider multifactor power plant's outlet reclosure time setting device, characterized in that comprehensive
Consider the optimal reclosure time that multifactor optimal reclosing determining module determines are as follows:
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| CN109888722A (en) * | 2019-01-10 | 2019-06-14 | 中国南方电网有限责任公司 | A kind of power plant outlet single-phase adaptive reclosing method |
| CN111600301B (en) * | 2020-06-04 | 2021-08-31 | 国网山东省电力公司电力科学研究院 | Rapid setting method and system for optimal reclosing moment |
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| CN104377642A (en) * | 2014-12-01 | 2015-02-25 | 国家电网公司 | Method for setting reclosing time on basis of secondary arc currents and recovery voltages |
| CN107294051A (en) * | 2016-04-05 | 2017-10-24 | 国网山西省电力公司 | A kind of single-pole reclosing time based on line length determines method |
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| CN104377642A (en) * | 2014-12-01 | 2015-02-25 | 国家电网公司 | Method for setting reclosing time on basis of secondary arc currents and recovery voltages |
| CN107294051A (en) * | 2016-04-05 | 2017-10-24 | 国网山西省电力公司 | A kind of single-pole reclosing time based on line length determines method |
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