CN106249105A - A kind of power system oscillation identification system and method - Google Patents

A kind of power system oscillation identification system and method Download PDF

Info

Publication number
CN106249105A
CN106249105A CN201610626040.6A CN201610626040A CN106249105A CN 106249105 A CN106249105 A CN 106249105A CN 201610626040 A CN201610626040 A CN 201610626040A CN 106249105 A CN106249105 A CN 106249105A
Authority
CN
China
Prior art keywords
impedance
vibration
circuit
protection
module
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.)
Granted
Application number
CN201610626040.6A
Other languages
Chinese (zh)
Other versions
CN106249105B (en
Inventor
马静
张润峰
项晓强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN201610626040.6A priority Critical patent/CN106249105B/en
Publication of CN106249105A publication Critical patent/CN106249105A/en
Application granted granted Critical
Publication of CN106249105B publication Critical patent/CN106249105B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • 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
    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a kind of power system oscillation identification system and method, described power system oscillation identification system includes information gathering and processing module, sinusoidal impedance computation module and the vibration identification module being linked in sequence；Described information gathering and processing module are used for gathering and calculate power-frequency voltage and power current, it is judged that whether action is protected in circuit both sides, if both sides protection act, then starts sinusoidal impedance computation module；Described sinusoidal impedance computation module is used for calculating circuit sine comprehensive impedance；Described vibration identification module is used for judging whether system vibrates, if power system is vibrated, then this module sends block signal to protection equipment, otherwise sends trip signal to protection equipment.

Description

A kind of power system oscillation identification system and method
Technical field
The present invention relates to the technical field of relay protection of power system, particularly relate to power system oscillation identification system and Its method.
Background technology
Electrical network large-scale area interconnects, and causes power system oscillation to happen occasionally, it is possible to cause the malfunction of distance protection, Even threaten the safe and stable operation of power system.Therefore, vibration identifying schemes is carried out research to have important practical significance And engineering practical value.
The difficult point building vibration identifying schemes is concentrated mainly on two aspects: one is that locking is protected under the simple oscillatory condition of system Protect, prevent its malfunction；Two when being to break down during out-of-step blocking, it is possible to quickly open and protection.At present, widely used vibration Recognition methods specifically include that measurement locus of impedance method, measure resistance change rate method, based onVibration recognizer, based on The vibration recognizer etc. of compensation principle.Wherein, measure locus of impedance method and can be applicable to different system oscillation patterns, but easily Changed by system network architecture and affected, and the problem that there is difficulty of adjusting.Measure resistance change rate method and be applicable to different Network structure and system operation mode, but the action threshold value of the method relies on and is manually set, and required time delay is longer, necessarily The application of the method is limited in degree.Based onVibration recognizer reliably can open under failure condition again in vibration Put protection, but in the case of circuit both sides electromotive force amplitude does not waits, there is certain time delay.Vibration based on compensation principle is known Other algorithm, its error is affected by connections mode relatively big, and is difficult to when load is heavier adjust offset.
It is desirable to there are a kind of power system oscillation identification system and method can overcome or at least alleviate prior art Drawbacks described above.
Summary of the invention
It is an object of the invention to provide a kind of power system oscillation identification system and method to overcome in prior art The problems referred to above existed.
For achieving the above object, the present invention provides a kind of power system oscillation identification system, including the information being linked in sequence Gather and processing module, sinusoidal impedance computation module and vibration identification module；
Described information gathering and processing module are used for gathering and calculate power-frequency voltage and power current, it is judged that circuit both sides are protected Protect whether action, if both sides protection act, then start sinusoidal impedance computation module；
Described sinusoidal impedance computation module is used for calculating circuit sine comprehensive impedance；
Described vibration identification module is used for judging whether system vibrates, if power system is vibrated, then and this module Send block signal to protection equipment, otherwise send trip signal to protection equipment.
The present invention provides a kind of method using power system oscillation identification system, comprises the following steps:
(1) the sinusoidal comprehensive impedance of definition；
(2) voltage phasor plane when vibrating and voltage phasor plane during fault are analyzed；
(3) according to the difference under fault condition, the structure vibration again in system oscillation, fault, vibration of sinusoidal comprehensive impedance Identical criterion；
(4) judge according to vibration identical criterion: when protection starts and meets vibration identical criterion, i.e. judge that system is sent out Give birth to vibration, by protection blocking；When protection starts but is unsatisfactory for vibration identical criterion, i.e. judge to there occurs fault, protection act In tripping operation.
Preferably, the definition of the sinusoidal comprehensive impedance in described step (1) is:
|Zcom|=| Zmc|+|Znc|
Wherein, | Zmc| measure impedance for circuit M side sine, | Znc| measure impedance for circuit N side sine.
Preferably, described step (2) analyzes voltage phasor plane during vibration, when system is in oscillatory regime, sinusoidal Comprehensive impedance is equal with the impedance magnitude of protected circuit.
Preferably, described step (2) analyzes voltage phasor plane during fault, occurs three to connect in system through transition resistance During ground short circuit, circuit sine comprehensive impedance is more than the modulus value of line impedance.
Preferably, the vibration identical criterion in described step (3) is:
||Zcom|-|ZL| | ＜ KaRg
Wherein, transition resistance partition coefficient KaCan adjust intoTransition resistance Rg Can be according to different electric pressures, the minima of transition resistance when choosing three-phase ground short circuit.
The present invention proposes a kind of power system oscillation identification system and method, the power system oscillation identification system of the present invention System and method thereof are not affected by system operation mode and cycle of oscillation, it is possible to accurately identify vibration and fault, and in vibration Again during fault, it is possible to correct quickly open and protection；There is certain adaptivity, not by transition resistance and the shadow of abort situation Ring；Without obtaining the dorsal part impedance of protection, amount of calculation is little, and engineering practicability is strong.
Accompanying drawing explanation
Fig. 1 is a kind of power system oscillation identification system construction drawing.
Fig. 2 is voltage phasor plane during vibration.
Voltage phasor plane when Fig. 3 is fault.
Fig. 4 is power system oscillation equivalent model.
Fig. 5 is system equivalent electromotive force phasor relation figure.
Fig. 6 is Three-phase Power Systems short-circuit analysis model.
Detailed description of the invention
Clearer for the purpose making the present invention implement, technical scheme and advantage, below in conjunction with in the embodiment of the present invention Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, the most identical or class As label represent same or similar element or there is the element of same or like function.Described embodiment is the present invention A part of embodiment rather than whole embodiments.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to use In explaining the present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained under not making creative work premise, broadly falls into the scope of protection of the invention.Under Face combines accompanying drawing and is described in detail embodiments of the invention.
In the present invention one broad embodiment: power system oscillation identification system, including the information gathering being linked in sequence with Processing module, sinusoidal impedance computation module and vibration identification module；Described information gathering and processing module are used for gathering and calculating Power-frequency voltage and power current, it is judged that whether action is protected in circuit both sides, if both sides protection act, then start sinusoidal impedance computation Module；Described sinusoidal impedance computation module is used for calculating circuit sine comprehensive impedance；Described vibration identification module is used for judging Whether system vibrates, if power system is vibrated, then this module sends block signal to protection equipment, otherwise sets to protection Preparation send trip signal.
In another broad embodiment of the present invention: the method using power system oscillation identification system, comprise the following steps:
(1) the sinusoidal comprehensive impedance of definition；
(2) voltage phasor plane when vibrating and voltage phasor plane during fault are analyzed；
(3) according to the difference under fault condition, the structure vibration again in system oscillation, fault, vibration of sinusoidal comprehensive impedance Identical criterion；
(4) judge according to vibration identical criterion: when protection starts and meets vibration identical criterion, i.e. judge that system is sent out Give birth to vibration, by protection blocking；When protection starts but is unsatisfactory for vibration identical criterion, i.e. judge to there occurs fault, protection act In tripping operation.
Below as a example by the power system oscillation equivalent model shown in Fig. 4, the detailed description of the invention of the present invention is described.
System equivalent potential at bus M and N is respectivelyWithCircuit both sides system impedance is respectively ZM and ZN.Quilt Protection circuit impedance is ZL, and system whole impedance is defined as Z∑=ZM+ZL+ZN。For protected circuit impedance angle,For circuit M Electric current is measured in protection installation place, side.
Calculate for simplifying the analysis, use it is assumed hereinafter that: 1) system impedance angle is identical, and when disregarding vibration, system frequency becomes Change the impact on system impedance；2) the system sending end before M side and N side are respectively vibration and receiving end, and system both sides are electronic Gesture amplitude is equal.
During vibration, system both sides equivalence electromotive force meets:
E · M = E · N e j δ - - - ( 1 )
In formula, δ isWithBetween angle, its physical significance is equivalent system merit angle, in the range of 0 °～360 ° with Cycle of oscillation changes.
If the t=0 moment,WithBetween relation as it is shown in figure 5, δ0For the t=0 momentWithBetween phase angle difference, Have:
δ=δ0+Δωt (2)
The oscillating current of system is:
I · M = E · M - E · N Z Σ = E · N Z Σ ( e j δ - 1 ) - - - ( 3 )
The measurement current amplitude that can be obtained protection installation place, M side by formula (3) is:
I m = | I · m | = E Z Σ | e j δ - 1 | = 2 E Z Σ s i n δ 2 - - - ( 4 )
By formula (4) it can be seen that the amplitude cyclically-varying of electric current is measured in protection installation place, electronic in the equivalence of system both sides When gesture phase angle is identical, it is 0 that its amplitude minimizes value；When system both sides equivalent electromotive force phase angle difference is 180 °, its amplitude reaches To maximum it isLikely cause false protection.
As in figure 2 it is shown, line segment OC is the most simultaneously by δ angle bisection, therefore the amplitude of voltage of oscillation center is:
In formula, UmThe amplitude of voltage is measured for protection installation place.
By formula (5) it can be seen that voltage of oscillation center amplitude changes with the change of system both sides equivalent electromotive force angle. Meanwhile, the geometrical relationship in Fig. 2 can obtain:
From formula (6), measure voltage sinusoidal component and meet:
In formula, ImThe amplitude of voltage is measured for protection installation place.
By formula (7) equation both sides simultaneously divided by the measurement current amplitude of protection installation place, and can obtain with formula (4) simultaneous:
In definition (8) | Zmc| for sine measure impedance, its value for protection installation place measure voltage sinusoidal component amplitude with Measure the ratio of current amplitude.The physical meaning that it is representative: by the modulus of impedance of protection installation place, M side to oscillation center position Value, it is not changed by system equivalent electromotive force phase angle difference is affected.
In like manner, impedance is measured for the sinusoidal of protection installation place, N side | Znc| also meet similar relational expression, it may be assumed that
Formula (8) and formula (9) are added and can obtain:
|Zmc|+|Znc|=| ZΣ-ZM-ZN|=| ZL| (15)
In formula (10), circuit both sides sine is measured impedance magnitude sum and is sinusoidal comprehensive impedance.Understand, when system is in During oscillatory regime, sinusoidal comprehensive impedance is equal with the impedance magnitude of protected circuit.
Power system equivalent analysis model when transition resistance generation three-phase shortcircuit is as shown in Figure 6.System is passed through at F point When crossing resistance generation three-phase shortcircuit, the voltage equation of protection installation place, M side is:
U · m = I · m Z k + I · f R g - - - ( 16 )
Calculating the sinusoidal component measuring voltage in Fig. 3, its amplitude meets:
Formula (12) both members can obtain divided by the measurement electric current protecting installation place simultaneously:
In like manner can obtain, N side sine is measured impedance and is:
Formula (13) and formula (14) simultaneous can be obtained:
By the way of long-pending with differenceization by formula (16) abbreviation it is:
By above-mentioned analysis it can be seen that system through transition resistance generation three-phase ground short circuit time, the sinusoidal comprehensive resistance of circuit The anti-modulus value more than line impedance.
Being analyzed from above, when system oscillation, circuit sine comprehensive impedance is equal to the positive sequence of protected circuit Impedance magnitude；And system through transition resistance generation three-phase ground time, circuit sine comprehensive impedance is more than the modulus value of line impedance. In the case of comparison system vibration and three-phase shortcircuit, the difference characteristic of circuit sine comprehensive impedance, can show that vibration identifies Criterion:
||Zcom|-|ZL| | ＜ KaRg (23)
When protection starts and meets vibration identical criterion, i.e. judge that system there occurs vibration, by protection blocking；Work as protection When starting but be unsatisfactory for vibration identical criterion, i.e. judging to there occurs fault, protection act is in tripping operation.
Fig. 1 gives vibration identifying schemes based on sinusoidal comprehensive impedance.In order to reduce amount of calculation and communication pressure, only exist Vibration identical criterion is started in the case of the distance protection action of circuit both sides.This programme calculates initially with full-wave fourier algorithm and protects Protect the measurement voltage of installation place and measure electric current, after protection starts, being in vibration or fault according to formula (23) judgement system State, and determine whether to answer latch-up protection according to judged result.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit.To the greatest extent The present invention has been described in detail by pipe with reference to previous embodiment, it will be understood by those within the art that: it is still Technical scheme described in foregoing embodiments can be modified, or wherein portion of techniques feature is carried out equivalent replace Change；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme God and scope.

Claims (6)

1. a power system oscillation identification system, it is characterised in that include the information gathering that is linked in sequence and processing module, just String impedance computation module and vibration identification module；
Described information gathering and processing module are used for gathering and calculate power-frequency voltage and power current, it is judged that the protection of circuit both sides is No action, if both sides protection act, then starts sinusoidal impedance computation module；
Described sinusoidal impedance computation module is used for calculating circuit sine comprehensive impedance；
Described vibration identification module is used for judging whether system vibrates, if power system is vibrated, then this module is to guarantor The equipment that protects sends block signal, otherwise sends trip signal to protection equipment.
2. the method using power system oscillation identification system described in the claims 1, comprises the following steps:
(1) the sinusoidal comprehensive impedance of definition；
(2) voltage phasor plane when vibrating and voltage phasor plane during fault are analyzed；
(3) according to sinusoidal comprehensive impedance difference under fault condition again in system oscillation, fault, vibration, structure vibration identifies Criterion；
(4) judge according to vibration identical criterion: when protection starts and meets vibration identical criterion, i.e. judge that system there occurs Vibration, by protection blocking；When protection starts but is unsatisfactory for vibration identical criterion, i.e. judging to there occurs fault, protection act is in jumping Lock.
3. power system oscillation identification method as claimed in claim 2, it is characterised in that: the sine in described step (1) is combined The definition closing impedance is:
|Zcom|=| Zmc|+|Znc|
Wherein, | Zmc| measure impedance for circuit M side sine, | Znc| measure impedance for circuit N side sine.
4. power system oscillation identification method as claimed in claim 2, it is characterised in that: when described step (2) analyzes vibration Voltage phasor plane, when system is in oscillatory regime, sinusoidal comprehensive impedance is equal with the impedance magnitude of protected circuit.
5. power system oscillation identification method as claimed in claim 2, it is characterised in that: when described step (2) analyzes fault Voltage phasor plane, system through transition resistance generation three-phase ground short circuit time, circuit sine comprehensive impedance more than circuit hinder Anti-modulus value.
6. power system oscillation identification method as claimed in claim 2, it is characterised in that: the vibration in described step (3) is known Other criterion is:
||Zcom|-|ZL| | ＜ KaRg
Wherein, transition resistance partition coefficient KaCan adjust intoTransition resistance RgCan root According to different electric pressures, the minima of transition resistance when choosing three-phase ground short circuit.
CN201610626040.6A 2016-08-02 2016-08-02 A kind of power system oscillation identifying system and its method Active CN106249105B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610626040.6A CN106249105B (en) 2016-08-02 2016-08-02 A kind of power system oscillation identifying system and its method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610626040.6A CN106249105B (en) 2016-08-02 2016-08-02 A kind of power system oscillation identifying system and its method

Publications (2)

Publication Number Publication Date
CN106249105A true CN106249105A (en) 2016-12-21
CN106249105B CN106249105B (en) 2019-03-01

Family

ID=57606635

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610626040.6A Active CN106249105B (en) 2016-08-02 2016-08-02 A kind of power system oscillation identifying system and its method

Country Status (1)

Country Link
CN (1) CN106249105B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350588A (en) * 2019-07-30 2019-10-18 华北电力大学 A kind of double-fed blower grid-connected system dynamic power stability assessment method and system
CN110726955A (en) * 2019-11-07 2020-01-24 林心 Electric power system oscillation and short-circuit fault identification method
CN110736939A (en) * 2019-11-07 2020-01-31 林心 dynamic identification system for oscillation center of power system
CN110752601A (en) * 2019-11-07 2020-02-04 林心 Electric power system oscillation identification and control system
CN110763940A (en) * 2019-11-07 2020-02-07 林心 Method for estimating oscillation center of power system by using phasor diagram method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070156358A1 (en) * 2005-12-30 2007-07-05 Abb Technology Ltd. Method and device for fault location on three terminal power line
WO2006039233A3 (en) * 2004-09-29 2007-12-27 Schweitzer Engineering Lab Inc Systems and methods for protection of electrical networks
CN101320911A (en) * 2008-01-25 2008-12-10 烟台东方电子信息产业股份有限公司 Electric power line longitudinal coupling protection decision method based on integrated impedance
CN101789588A (en) * 2010-01-15 2010-07-28 东方电子股份有限公司 Method for openly judging three phase fault in power system line protection oscillation
CN102749517A (en) * 2012-07-11 2012-10-24 北京四方继保自动化股份有限公司 Method for monitoring and analyzing oscillation impedance measurement track of electric power system
CN103580009A (en) * 2013-11-11 2014-02-12 华北电力大学 Self-adaptive overload recognition system based on composite phasor plane and method thereof
CN103701107A (en) * 2013-12-26 2014-04-02 北京四方继保自动化股份有限公司 Adaptive differential protection method
CN103795042A (en) * 2014-02-21 2014-05-14 华北电力大学 Pilot protection system and method based on virtual transition impedance

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006039233A3 (en) * 2004-09-29 2007-12-27 Schweitzer Engineering Lab Inc Systems and methods for protection of electrical networks
US20070156358A1 (en) * 2005-12-30 2007-07-05 Abb Technology Ltd. Method and device for fault location on three terminal power line
CN101320911A (en) * 2008-01-25 2008-12-10 烟台东方电子信息产业股份有限公司 Electric power line longitudinal coupling protection decision method based on integrated impedance
CN101789588A (en) * 2010-01-15 2010-07-28 东方电子股份有限公司 Method for openly judging three phase fault in power system line protection oscillation
CN102749517A (en) * 2012-07-11 2012-10-24 北京四方继保自动化股份有限公司 Method for monitoring and analyzing oscillation impedance measurement track of electric power system
CN103580009A (en) * 2013-11-11 2014-02-12 华北电力大学 Self-adaptive overload recognition system based on composite phasor plane and method thereof
CN103701107A (en) * 2013-12-26 2014-04-02 北京四方继保自动化股份有限公司 Adaptive differential protection method
CN103795042A (en) * 2014-02-21 2014-05-14 华北电力大学 Pilot protection system and method based on virtual transition impedance

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
杨玉倩: "基于广域信息的电网失步振荡中心定位", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 *
马静等: "A Novel Line Protection Scheme for Single Phase-to-Ground Fault Based on Voltage Phase Comparison", 《IEEE TRANSACTIONS ON POWER DELIVERY》 *
马静等: "一种抗过渡电阻的新型自适应距离保护方案", 《电力系统自动化》 *
马静等: "基于复合相量平面的自适应过负荷识别方法", 《电网技术》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350588A (en) * 2019-07-30 2019-10-18 华北电力大学 A kind of double-fed blower grid-connected system dynamic power stability assessment method and system
CN110350588B (en) * 2019-07-30 2020-09-04 华北电力大学 Dynamic energy stability evaluation method and system for doubly-fed fan grid-connected system
CN110726955A (en) * 2019-11-07 2020-01-24 林心 Electric power system oscillation and short-circuit fault identification method
CN110736939A (en) * 2019-11-07 2020-01-31 林心 dynamic identification system for oscillation center of power system
CN110752601A (en) * 2019-11-07 2020-02-04 林心 Electric power system oscillation identification and control system
CN110763940A (en) * 2019-11-07 2020-02-07 林心 Method for estimating oscillation center of power system by using phasor diagram method

Also Published As

Publication number Publication date
CN106249105B (en) 2019-03-01

Similar Documents

Publication Publication Date Title
CN106249105A (en) A kind of power system oscillation identification system and method
US9568516B2 (en) Determining status of electric power transmission lines in an electric power transmission system
RU2546188C1 (en) Voltage-based device and method for identification of faults in transmission line
CN107925235A (en) Safe fault detect in power substation
CN106655121B (en) A kind of micro-capacitance sensor bus Low ESR adaptive guard method
EP3425767B1 (en) Method, apparatus and computer readable storage medium for electrical islanding detection
EP2502319A1 (en) Method and apparatus for ground distance protection
CN102200564B (en) Power system oscillation identification method based on power angle calculation
CN101666825A (en) Grid voltage stabilization on-line monitoring method based on voltage stability local indexes
CN102761106B (en) Quick starting and vector calculation method for intelligent substation integrated protection
CN104076248B (en) A kind of method for determining fault direction compared based on positive sequence polarization voltage-phase
US8340930B2 (en) Arrangement for protecting equipment of a power system
JP7167351B2 (en) Distributed Fake Data Mitigation for Nested Microgrids
CN103632043A (en) Dominant power system instability mode recognition method based on real-time measurement response information
CN102624012B (en) Method for distinguishing negative damping low frequency oscillation on the basis of moment decomposition integral algorithm
CN105975438B (en) A kind of computational methods of the infinitely great electric power system short-circuit impact coefficient
CN102798803A (en) Method for detecting line fault of power distribution network
CN105738772A (en) Compulsory disturbance source positioning method based on power and frequency fluctuation phase
CN102077436B (en) Method for production of an oscillating signal and electrical protection - or measurement instrument having an oscillation identification device
JP5393117B2 (en) Transmission line accident location device and transmission line accident location method
CN107294049A (en) A kind of short circuit electric current fast prediction and guard method and system
CN103683230A (en) Method and structure for achieving distance protection of power distribution network of power system
Ma et al. Improved zone 1 top-line tilting scheme for polygonal distance protection in the outgoing line of type-4 wind parks
CN112636323B (en) Defense strategy optimization method for cooperative attack of alternating current-direct current system
CN104124673B (en) A kind of method for determining oscillation center position

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