CN110333444A - A kind of temporary drop critical clearing time calculation method based on name plate of motor parameter - Google Patents

A kind of temporary drop critical clearing time calculation method based on name plate of motor parameter Download PDF

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Publication number
CN110333444A
CN110333444A CN201910622489.9A CN201910622489A CN110333444A CN 110333444 A CN110333444 A CN 110333444A CN 201910622489 A CN201910622489 A CN 201910622489A CN 110333444 A CN110333444 A CN 110333444A
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slip
clearing time
revolutional slip
critical clearing
revolutional
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CN110333444B (en
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钟振芳
孟庆伟
高涵
赵莹
管清爽
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China University of Petroleum East China
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China University of Petroleum East China
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The method for the temporary drop critical clearing time calculating based on induction conductivity nameplate parameter that the invention discloses a kind of.This method includes calculating breakdown slip based on nameplate parameter, is based on nameplate parameter calculated equilibrium point revolutional slip, and non-equilibrium revolutional slip calculates temporarily drop critical clearing time three parts using breakdown slip, balance revolutional slip, non-equilibrium revolutional slip.The method that critical clearing time calculating temporarily drops in the present invention is succinct, and without experiment, readily understood, application is convenient.

Description

A kind of temporary drop critical clearing time calculation method based on name plate of motor parameter
Technical field
The invention belongs to field of power system, be related to it is a kind of based on induction conductivity nameplate parameter temporarily come boundary's excision when Between the method that calculates.
Background technique
Power quality problem is by more and more concerns.Applying for induction conductivity is in the majority in actual industrial production, and Voltage dip causes motor out of service.Motor can be born during voltage dip the voltage dip duration be one key Parameter, the configuration of system protection can be preferably carried out using the time, and auxiliary motor type selecting is targetedly temporarily dropped It administers.Except this, the temporary drop critical clearing time calculating that induction conductivity can be carried out using nameplate parameter is with the obvious advantage: nameplate is joined Number obtains easy and accurate；It is at low cost without experiment, it is easy to implement；It is easy to be understood and run by field engineer, popularization is answered With convenient.
Summary of the invention
The technical scheme is that a kind of temporary drop critical clearing time calculating side based on induction conductivity nameplate parameter Method.
A kind of calculation method of temporary drop critical clearing time, it is characterized in that method includes the following steps:
Step 1: breakdown slip s is calculated based on nameplate parameterm
The voltage rating u of motor is obtained according to the nameplate of induction conductivityn, rated power Pn, rated speed nn, number of pole-pairs P, inertia constant H, frequency f and torque capacity multiple km.The synchronous rotational speed n of induction conductivitysBy system frequency f and induction electric Machine number of pole-pairs p is sought as the following formula:
ns=60fp
Rated slip s is calculated using the synchronous rotational speed of induction conductivityn:
Breakdown slip s is calculated by rated slip according to the following formulam:
Step 2: based on nameplate parameter calculated equilibrium point revolutional slip and non-equilibrium revolutional slip
According to motor load type and characteristic, the relational expression T of its load torque and revolutional slip is obtainedl(s)。
The nominal torque value T of motornCalculation formula is as follows:
The torque formula of motor is as followsBring formula T intoe(un, s) and=Tl (s) equation solution is carried out, the biggish obtained solution in [0,1] range is non-equilibrium revolutional slip sc, lesser solution is Equalization point revolutional slip s0。
Step 3: calculating temporarily drop critical clearing time using breakdown slip, balance revolutional slip, non-equilibrium revolutional slip
Using three revolutional slips of aforementioned calculating, i.e. breakdown slip, balance revolutional slip, non-equilibrium revolutional slip, electricity is utilized Motivation stability principle, the residual voltage when voltage dip occurs for system are usagWhen, critical clearing time temporarily dropsCalculation formula It is as follows:
Specific embodiment
Below with reference to specification, elaborate to preferred embodiment.It is emphasized that following the description is only example Property, the range and its application being not intended to be limiting of the invention.
It is simple that the present invention provides one kind, efficiently, is easy to temporary when the voltage dip based on name plate of motor parameter of calculating The calculation method of critical clearing time drops.By taking following induction conductivity relevant calculation process as an example, the specific implementation of this method is such as Under:
Pass through the available voltage rating u of certain name plate of motor parametern=6.0kV, rated power Pn=560kW, specified turn Fast nn=1485r/min, number of pole-pairs p=2, inertia constant H=3.6470, frequency f=50hz and torque capacity multiple km=1.8.
1, breakdown slip s is calculated based on nameplate parameterm
The following n of calculation formulas=60fp,Thus breakdown slip is calculated sm=0.033；
2, the equalization point revolutional slip s based on nameplate parameter0With non-equilibrium revolutional slip scIt calculates
If three kinds of load per unit value expression formulas of motor are as follows: constant torque load Tl,ConT(s)=1；Constant power load Tl,ConP (s)=0.2+0.8 (1-s)；Blower, load of the pumps Tl,ConF(s)=0.6+0.435 (1-s)2。
Motor torque formula is as followsAccording to Te(un, s) and=TlIt (s) can be with It is as follows to obtain three kinds of loadtype equations:
Constant torque load:Solve s0=0.01, sc=0.1088；
Constant power load:Solve s0=0.01, sc=0.1227；
Blower, load of the pumps:Solve s0=0.01, sc=0.1172.
3, the temporary drop critical clearing time based on nameplate parameter calculates
If voltage dip usag=0.5pu, then the lower temporarily drop critical clearing time calculation method of three types load is as follows:
Constant torque load:
Constant power load:
Blower, load of the pumps:
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims Subject to.

Claims (2)

1. a kind of temporary drop critical clearing time calculation method based on name plate of motor parameter is it is characterized in that this method includes such as Lower three steps:
Step 1 is based on nameplate parameter and calculates breakdown slip；
Step 2 is based on nameplate parameter calculated equilibrium point revolutional slip and non-equilibrium revolutional slip；
Step 3 calculates temporarily drop critical clearing time using breakdown slip, balance revolutional slip, non-equilibrium revolutional slip.
2. the temporary drop critical clearing time calculation method described in a kind of claim 1 based on name plate of motor parameter, it is characterized in that The breakdown slip s calculated based on nameplate parameter is utilized in its step 3m, balance revolutional slip s0, non-equilibrium revolutional slip sc, in system Residual voltage when voltage dip occurs is usagThe following formula of Shi Liyong calculate criticality safety voltage
Wherein: H, un, TnRespectively induction conductivity inertia constant, voltage rating, nominal torque value, s are revolutional slip, Tl(s) it is The load torque of induction conductivity when revolutional slip is s, kmFor torque capacity multiple, smFor breakdown slip.
CN201910622489.9A 2019-07-11 2019-07-11 Temporary boundary excision time calculation method based on motor nameplate parameters Active CN110333444B (en)

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CN201910622489.9A CN110333444B (en) 2019-07-11 2019-07-11 Temporary boundary excision time calculation method based on motor nameplate parameters

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110504890A (en) * 2019-08-22 2019-11-26 国网山东省电力公司德州供电公司 A kind of safety critical voltage calculation method based on name plate of motor parameter
CN111969924A (en) * 2020-08-18 2020-11-20 四川大学 Adaptive action control method for alternating current contactor
CN115085152A (en) * 2022-07-01 2022-09-20 兰州理工大学 Method and system for calculating temporary landing critical elimination time of motor protector

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JPS5963991A (en) * 1982-10-01 1984-04-11 Nec Corp Speed controller for motor
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CA2783755A1 (en) * 2012-07-24 2014-01-24 University Of Saskatchewan Apparatus and method for out-of-step protection using the analysis of trajectories of electrical measurements in state plane
CN103280783A (en) * 2013-05-09 2013-09-04 哈尔滨工程大学 Method for calculating failure critical clearing time based on critical unit pair
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110504890A (en) * 2019-08-22 2019-11-26 国网山东省电力公司德州供电公司 A kind of safety critical voltage calculation method based on name plate of motor parameter
CN111969924A (en) * 2020-08-18 2020-11-20 四川大学 Adaptive action control method for alternating current contactor
CN111969924B (en) * 2020-08-18 2022-03-29 四川大学 Adaptive action control method for alternating current contactor
CN115085152A (en) * 2022-07-01 2022-09-20 兰州理工大学 Method and system for calculating temporary landing critical elimination time of motor protector
CN115085152B (en) * 2022-07-01 2023-11-14 兰州理工大学 Method and system for calculating temporary drop critical elimination time of motor protector

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