CN107658847B - The low fiting tuning method for encouraging limitation and field loss protection based on power planes - Google Patents

The low fiting tuning method for encouraging limitation and field loss protection based on power planes Download PDF

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CN107658847B
CN107658847B CN201710987314.9A CN201710987314A CN107658847B CN 107658847 B CN107658847 B CN 107658847B CN 201710987314 A CN201710987314 A CN 201710987314A CN 107658847 B CN107658847 B CN 107658847B
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generator
low
static stability
field loss
loss protection
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CN107658847A (en
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李勇
李会新
金明亮
王兴国
郭雅蓉
王英英
谢俊
李锋
陈祥文
柳焕章
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STATE GRID CENTER CHINA GRID Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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STATE GRID CENTER CHINA GRID Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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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
    • H02H7/06—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 for dynamo-electric generators; for synchronous capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

A kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes; this method first calculates net work rate static stability boundary equation of the generator in power planes; static stability boundary is calculated by system minimum operational mode further according to net work rate static stability boundary equation; and it obtains the field loss protection adjusted by static stability boundary and low encourages limitation; then using generator into phase depth as constraint condition; the low cooperation coefficient for encouraging restraining line and static stability boundary is adjusted, to guarantee the low cooperation encouraged and limited with by the quiet field loss protection surely adjusted.The design not only solves the low technical problem for encouraging limitation Yu field loss protection mismatch of generator, and improves generator and electric network coordination mating capability, the stable operation level for improving electric system.

Description

The low fiting tuning method for encouraging limitation and field loss protection based on power planes
Technical field
The invention belongs to Relay Protection Technology in Power System fields more particularly to a kind of low based on power planes to encourage limitation With the fiting tuning method of field loss protection, it is primarily adapted for use in and solves the low technology hardly possible for encouraging limitation and field loss protection mismatch of generator Topic.
Background technique
The cooperation encouraged between limitation and field loss protection low for generator, domestic and foreign scholars have carried out a large amount of research.Make Basic for the low cooperation encouraged between limitation and field loss protection, the track of the static stability boundary of generator is most important.Generator it is quiet To the generator terminal of generator, application is very extensive for steady boundary reflection: the stator criterion of field loss protection, the low control criterion for encouraging limitation, Generator enters step-out etc..Different applications uses different physical quantitys, such as: field loss protection impedanceZ is power generation Machine generator terminal measures impedance,For generator terminal voltage,For generator generator terminal electric current；It is low to encourage limitation powerS is The apparent energy value of generator generator terminal,For the conjugate of the electric current of generator generator terminal.Currently, in power planes, quiet steady side Boundary's equation may be expressed as:
Wherein, P is generator generator terminal active power, and Q is generator generator terminal reactive power, XSFor system to generator generator terminal Equivalent impedance, XdFor generator direct-axis synchronous reactance.It is a circle using set end voltage U as parameter, is safety in circle Operational Zone, circle is outer to encourage restricted area to be low, as soon as given U, has the track of a S, such track is false.U itself It is a variable, and mandatory fixation, such distortion or expansion active region (malfunction) or reduces active region (tripping). Existing generator is low to encourage limitation and field loss protection is cooperated on impedance plane, is not easy to adjust and there are the risks of mismatch.
Summary of the invention
The purpose of the present invention is overcome the low defect for encouraging limitation Yu field loss protection mismatch of generator existing in the prior art With problem, provide that a kind of generator is low to encourage limitation and field loss protection adaptively cooperates based on power planes low encourage limitation and lose The fiting tuning method of magnetic protection.
In order to achieve the above object, the technical solution of the invention is as follows: a kind of low based on power planes is encouraged limitation and is lost The fiting tuning method of magnetic protection, the described method comprises the following steps:
A, net work rate static stability boundary equation of the generator in power planes is calculated are as follows:
In formula (1), P is generator generator terminal active power, Q∞For Infinite bus system reactive power, XSFor generator generator terminal with Interconnection impedance between Infinite bus system, XdFor generator internal impedance, Q is generator generator terminal reactive power, XΣ=XS+Xd；
B, according to net work rate static stability boundary equation, the X obtained by system minimum operational modeSStatic stability boundary is calculated, X is enabledS1 =k1XSThe field loss protection adjusted by static stability boundary is obtained, X is enabledS2=k2XSIt obtains low encouraging limitation, wherein k1、k2For cooperation coefficient, XS1、XS2For the interconnection impedance between generator generator terminal and Infinite bus system；
C, with generator into phase depthAs constraint condition, adjustment is low to encourage limit The cooperation coefficient k of line and static stability boundary processed2, to guarantee the low cooperation encouraged and limited with by the quiet field loss protection surely adjusted.
In step C, generator is into phase depthIt is obtained by following steps:
It a, will under conditions of static stability boundaryXS2=k2XSSubstitution formula obtains in (1):
In formula (2), U∞For Infinite bus system voltage；
B, with rated voltage UeOn the basis of value, per unit value 1, by formula (2) conversion are as follows:
In formula (3), XΣ=k2XS+Xd；
C, P=1 ,-Q=tg α are substituted into formula (3) to obtain generator into phase depth.
The cooperation coefficient k1=1.1, k2> 2, the generator is into α=0.05~0.15 phase depth tg.
Compared with prior art, the invention has the benefit that
Pass through proposition in a kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes of the present invention Net work rate static stability boundary equation, optimizes static stability boundary in power planes, eliminates set end voltage to the shadow of static stability boundary equation It rings, encourages limitation and field loss protection to be low and provide condition, and then using generator into phase depth as constraint condition, by adjusting low The cooperation coefficient for encouraging restraining line and static stability boundary proposes the low fiting tuning method for encouraging limitation and field loss protection, realizes low Encourage the adaptive cooperation of limitation and field loss protection.Therefore, the present invention not only solves that generator is low to encourage limitation and field loss protection and lose The technical problem matched, and improve generator and electric network coordination mating capability, the stable operation level for improving electric system.
Detailed description of the invention
Fig. 1 is static stability boundary mutual relation of electric voltage figure in the present invention.
Fig. 2 is net work rate static stability boundary expression formula power planes schematic diagram in the present invention.
Fig. 3 is low in power planes in the present invention to encourage limitation and field loss protection fiting relation figure.
In figure: 1 indicates static stability boundary, and 2 indicate by the quiet field loss protection surely adjusted, and 3, which indicate low, encourages limitation, and 4 indicate generator terminal.
(a) indicates generator and Infinite bus system in Fig. 1.
(b) indicates voltage plane each point voltage-phase in Fig. 1.
Specific embodiment
Below in conjunction with Detailed description of the invention and specific embodiment, the present invention is described in further detail.
Referring to Fig. 1 to Fig. 3, a kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes is described Method the following steps are included:
A, net work rate static stability boundary equation of the generator in power planes is calculated are as follows:
In formula (1), P is generator generator terminal active power, Q∞For Infinite bus system reactive power, XSFor generator generator terminal with Interconnection impedance between Infinite bus system, XdFor generator internal impedance, Q is generator generator terminal reactive power, XΣ=XS+Xd；
B, according to net work rate static stability boundary equation, the X obtained by system minimum operational modeSStatic stability boundary is calculated, X is enabledS1 =k1XSThe field loss protection adjusted by static stability boundary is obtained, X is enabledS2=k2XSIt obtains low encouraging limitation, wherein k1、k2For cooperation coefficient, XS1、XS2For the interconnection impedance between generator generator terminal and Infinite bus system；
C, with generator into phase depthAs constraint condition, adjustment is low to encourage limit The cooperation coefficient k of line and static stability boundary processed2, to guarantee the low cooperation encouraged and limited with by the quiet field loss protection surely adjusted.
In step C, generator is into phase depthIt is obtained by following steps:
It a, will under conditions of static stability boundaryXS2=k2XSSubstitution formula obtains in (1):
In formula (2), U∞For Infinite bus system voltage；
B, with rated voltage UeOn the basis of value, per unit value 1, by formula (2) conversion are as follows:
In formula (3), XΣ=k2XS+Xd；
C, P=1 ,-Q=tg α are substituted into formula (3) to obtain generator into phase depth.
The cooperation coefficient k1=1.1, k2> 2, the generator is into α=0.05~0.15 phase depth tg.
The principle of the present invention is described as follows:
In power planes, work as XS=0, XΣ=Xd, parabolical vertex (0, Q∞), be open infinite width, is one etc. in fact Idle straight line；Work as XS→ ∞, XΣ=XS, vertex of a parabola (0,0), opening is infinite narrow, with XSFrom 0 → ∞, vertex of a parabola → move up, it is open → narrows, safe operating area → become smaller.
With into phase depthAs constraint condition, since power is bigger, easier unstability, therefore, it is necessary to check volume Determine the chalaza of matching under power, it is general desirable: k1=1.1, k2α=0.05~0.15 > 2, tg, the smaller k of system mode2It is got over tg α It is small.
The task of adaptive setting is to calculate k2Value, it is constrained by tg α again, it is necessary to be established relationship between the two, be used The per unit value being worth on the basis of generator rating, is finally converted to famous value, and voltage reference value is rated voltage, phase The famous value answered is per unit value multiplied by a reference value.
Value (sets rated voltage U on the basis of generator ratingeEqual to Infinite bus system voltage U∞, per unit value 1), to be incited somebody to action by per unit valueIt is converted to
Embodiment:
A kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes, the method includes following steps It is rapid:
A, net work rate static stability boundary equation of the generator in power planes is calculated are as follows:
In formula (1), P is generator generator terminal active power, Q∞For Infinite bus system reactive power, XSFor generator generator terminal with Interconnection impedance between Infinite bus system, XdFor generator internal impedance, Q is generator generator terminal reactive power, XΣ=XS+Xd；
In step A, net work rate static stability boundary equation is obtained by following steps:
A, motor set end voltage, generator built-in potential and Infinite bus system it is idle between relationship
By taking attached drawing 1 as an example, generator generator terminal reactive power Q and Infinite bus system reactive power Q∞There are following relationships:
Q-Q∞=jIXS (4)
In formula (4), j represents imaginary part, and I, which is represented, flows through X in Fig. 1SElectric current, XSFor generator generator terminal and Infinite bus system it Between interconnection impedance；
In reactive power Q in generatorEWith Infinite bus system reactive power Q∞There are following relationships:
QE-Q∞=jIXΣ (5)
Composite type (4) and formula (5) can obtain:
By formula (6) it is found that generator generator terminal to Infinite bus system without work difference and generator built-in potential to Infinite bus system Without the ratio between work difference be equal to they between contact reactance ratio；
B, generator, Infinite bus system active power and reactive power between meet following relationship:
In formula (7), PEFor in generator in active power, P∞For Infinite bus system active power, QEFor in generator in nothing Function power, Q∞For the reactive power that Infinite bus system is entered, UEFor generator built-in potential, I is system power, φEFor UEWith I's Angle, U∞For Infinite bus system voltage, φ∞For U∞With the angle of I, δ=φE-φ∞；
For static stability boundary, δ=90 °, when connecting net resistance between Infinite bus system and generator, formula (7) be may be expressed as:
P2+QEQ∞=0 (8)
C, formula (8) are substituted into formula (5), Q can be eliminatedE, to obtain net work rate static stability boundary equation:
Formula (1) shows: with the variation of P, the track of jQ is an opening upwards, and vertex isParabolic Line, as shown in Fig. 2, jQ are generator generator terminal reactive power；
B, according to net work rate static stability boundary equation, the X obtained by system minimum operational modeSStatic stability boundary is calculated, X is enabledS1 =k1XSThe field loss protection adjusted by static stability boundary is obtained, X is enabledS2=k2XSIt obtains low encouraging limitation, wherein k1、k2For cooperation coefficient, XS1、XS2For the interconnection impedance between generator generator terminal and Infinite bus system；It is low encourage limitation, by the quiet field loss protection surely adjusted and Relationship between static stability boundary three in power planes is as shown in Fig. 3；
C, with generator into phase depthAs constraint condition, adjustment is low to encourage limit The cooperation coefficient k of line and static stability boundary processed2, to guarantee the low cooperation encouraged and limited with by the quiet field loss protection surely adjusted；
In step C, generator is into phase depthIt is obtained by following steps:
It a, will under conditions of static stability boundaryXS2=k2XSSubstitution formula obtains in (1):
In formula (2), U∞For Infinite bus system voltage；
B, with rated voltage UeOn the basis of value, per unit value 1, by formula (2) conversion are as follows:
In formula (3), XΣ=k2XS+Xd；
C, P=1 ,-Q=tg α are substituted into formula (3) to obtain generator into phase depth:
The cooperation coefficient k1=1.1, k2> 2, the generator is into α=0.05~0.15 phase depth tg；
For system shown in Figure 1, if XS=0.0785, Xd=1.74, take initial value k2=2, substituting into formula (9) can obtain:
Due to 0.33 > 0.15, then take k2=4, substituting into formula (9) can obtain:
Meet constraint condition, takes k2=4；
In conclusion visible (9) is tuning formulae, it is by 2 constraint conditions: k2α=0.05~0.15 > 2, tg. X under system minimum operational modeSSmaller, constraint condition more readily satisfies, XSWhen larger, constraint condition can only be reduced, generally not It will appear k2< 1.5 and tg α < 0.05.

Claims (3)

1. a kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes, which is characterized in that the method The following steps are included:
A, net work rate static stability boundary equation of the generator in power planes is calculated are as follows:
In formula (1), P is generator generator terminal active power, Q∞For Infinite bus system reactive power, XSFor generator generator terminal with it is infinite Interconnection impedance between big system, XdFor generator internal impedance, Q is generator generator terminal reactive power, XΣ=XS+Xd；
B, according to net work rate static stability boundary equation, the X obtained by system minimum operational modeSStatic stability boundary is calculated, X is enabledS1=k1XS The field loss protection adjusted by static stability boundary is obtained, X is enabledS2=k2XSIt obtains low encouraging limitation, wherein k1、k2For cooperation coefficient, XS1、 XS2For the interconnection impedance between generator generator terminal and Infinite bus system；
C, with generator into phase depthAs constraint condition, adjustment is low to encourage restraining line With the cooperation coefficient k of static stability boundary2, to guarantee the low cooperation encouraged and limited with by the quiet field loss protection surely adjusted.
2. a kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes according to claim 1, It is characterized by: in step C, generator is into phase depthIt is obtained by following steps It arrives:
It a, will under conditions of static stability boundaryXS2=k2XSSubstitution formula obtains in (1):
In formula (2), U∞For Infinite bus system voltage；
B, with rated voltage UeOn the basis of value, per unit value 1, by formula (2) conversion are as follows:
In formula (3), XΣ=k2XS+Xd；
C, P=1 ,-Q=tg α are substituted into formula (3) to obtain generator into phase depth.
3. a kind of low fiting tuning method for encouraging limitation and field loss protection based on power planes according to claim 1, It is characterized by: the cooperation coefficient k1=1.1, k2> 2, the generator is into α=0.05~0.15 phase depth tg.
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CN108736444B (en) * 2018-04-16 2021-08-24 中国电力科学研究院有限公司 Phase modulator field loss protection method and system
CN108879712B (en) * 2018-06-27 2021-08-17 中国电力科学研究院有限公司 Phase modulator field loss protection method and device based on phase advance rate detection criterion
CN109256806B (en) * 2018-10-26 2021-09-17 中国电力科学研究院有限公司 Low excitation limit medium and long term model building method and system based on digital-analog hybrid real-time simulation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264778A (en) * 1991-12-31 1993-11-23 Westinghouse Electric Corp. Apparatus protecting a synchronous machine from under excitation
CN101588153A (en) * 2009-07-08 2009-11-25 浙江省电力公司 Method of limiting low excitation
CN103780176A (en) * 2014-01-16 2014-05-07 国家电网公司 Low-excitation limit and field loss protection coordination method
CN104701816A (en) * 2015-03-20 2015-06-10 华北电力科学研究院有限责任公司 Method and device for matching and setting low-excitation limitation and field loss protection of salient-pole machine
CN105932643A (en) * 2016-05-16 2016-09-07 南京国电南自电网自动化有限公司 Excitation loss protection fixed value setting method for generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264778A (en) * 1991-12-31 1993-11-23 Westinghouse Electric Corp. Apparatus protecting a synchronous machine from under excitation
CN101588153A (en) * 2009-07-08 2009-11-25 浙江省电力公司 Method of limiting low excitation
CN103780176A (en) * 2014-01-16 2014-05-07 国家电网公司 Low-excitation limit and field loss protection coordination method
CN104701816A (en) * 2015-03-20 2015-06-10 华北电力科学研究院有限责任公司 Method and device for matching and setting low-excitation limitation and field loss protection of salient-pole machine
CN105932643A (en) * 2016-05-16 2016-09-07 南京国电南自电网自动化有限公司 Excitation loss protection fixed value setting method for generator

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