CN103779853A - Grid circuit overload maloperation-preventing relay protection method based on wide-area information - Google Patents

Grid circuit overload maloperation-preventing relay protection method based on wide-area information Download PDF

Info

Publication number
CN103779853A
CN103779853A CN201410053664.4A CN201410053664A CN103779853A CN 103779853 A CN103779853 A CN 103779853A CN 201410053664 A CN201410053664 A CN 201410053664A CN 103779853 A CN103779853 A CN 103779853A
Authority
CN
China
Prior art keywords
circuit
centerdot
matrix
transformer station
grid
Prior art date
Application number
CN201410053664.4A
Other languages
Chinese (zh)
Inventor
林富洪
Original Assignee
国家电网公司
国网福建省电力有限公司
国网福建省电力有限公司莆田供电公司
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 国家电网公司, 国网福建省电力有限公司, 国网福建省电力有限公司莆田供电公司 filed Critical 国家电网公司
Priority to CN201410053664.4A priority Critical patent/CN103779853A/en
Publication of CN103779853A publication Critical patent/CN103779853A/en

Links

Abstract

The invention discloses a grid circuit overload maloperation-preventing relay protection method based on wide-area information. According to the method, an existing wide-area measuring system of a grid is used for synchronously measuring the phasor quantity of the voltages and the phasor quantity of the currents of all transformer substations at first; if a grid single circuit trips, a wide-area backup protection system sequentially calculates the corrected impedance, the corrected admittance and the compensation voltage; voltages of all nodes of the grid of which the circuit has not tripped and the compensation voltage are superposed to obtain the voltage phasor quantities of all transformer substations of the grid which tripped; the currents flowing through all circuits in the grid are calculated and combined with circuit currents measured by the existing wide-area measuring system to form overload maloperation-preventing protection criteria. According to the grid circuit overload maloperation-preventing relay protection method based on the wide-area information, the protection action speed is high, the circuits can be reliably shut before ciruit overload protection maloperation occurs, other circuits are protected against overload and mistaken cutting, wherein the overload is caused by transferring of the currents after the grid single circuit tripped, and the large-area power failure of the grid is effectively prevented.

Description

Power network line overload faulty action preventing relay protecting method based on Wide-area Measurement Information
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of power network line overload faulty action preventing relay protecting method based on Wide-area Measurement Information.
Background technology
The task of relaying protection is fault and the irregular operating state of reflection protected element, can be divided into main protection and backup protection according to function.Wherein the task of excision protected element fault fast is only being undertaken in main protection, is not substantially subject to the impact of system operation mode.Along with the application of optical-fibre channel, high pressure, extra high voltage system main protection technology based on Two-Terminal Electrical Quantities are ripe day by day.And the task of doing the backup protection far away of adjacent electric component is also being undertaken in backup protection, owing to existing the possibility of transforming plant DC power-fail, this responsibility is to cancel.The information of protection installation place is only reacted in existing electrical network backup protection, is subject to the impact of power network topology annexation and operational mode.For guaranteeing its reliability, have to be configured and adjust according to the harshest situation; For guaranteeing its selectivity, have to sacrifice rapidity and the sensitivity of backup protection.Because electric network composition is increasingly sophisticated, just cause following potential safety hazard simultaneously:
1) backup protection matching relationship complexity, operate time is long.When serious, likely do not meet the desired critical clearing time of stability of power system, and then become large power grid security hidden danger.
2) backup protection configuration is large with the difficulty of adjusting, and can not follow the tracks of the variation of power system operation mode, even may occur protecting mismatch or under-sensitive situation.
3) backup protection can not be distinguished the trend transfer causing after internal fault and failure removal, and this likely causes the backup protection cascading trip in heavy load situation.
In the accident of having a power failure on a large scale, although just occurred that electric power system backup protection, according to design principle correct operation, objectively but accelerated the phenomenon of system crash.Therefore the backup protection system for damping of, considering electrical network global information is studied extremely urgent.
In recent years, the drawing-in system information in backup protection that appears as of wide area synchronized measurement system (WAMS) provides possibility.WAMS mono-is the electric phasor that can synchronously obtain in the whole network, has realized the monitoring of dynamic process of electrical power system; The 2nd, the renewal speed of measurement amount was tapered to a few tens of milliseconds by several seconds, create condition for realizing dynamic process of electrical power system control, make the design of carrying out backup protection from the angle of electrical network total optimization become possibility.
Summary of the invention
The invention provides a kind of power network line overload faulty action preventing relay protecting method based on Wide-area Measurement Information; after utilizing the existing WAMS of electrical network to realize the tripping operation of electrical network uniline, trend shifts the relay protection function that causes circuit overload false action-proof, and it has overcome the deficiencies in the prior art described in background technology.
The technical scheme adopting that the present invention solves its technical problem is:
Power network line overload faulty action preventing relay protecting method based on Wide-area Measurement Information, it comprises following sequential steps:
Step 1, wide area backup protection system utilizes the existing WAMS of electrical network to realize the synchro measure of the each transformer substation voltage phasor of electrical network, electric current phasor, and Real-time Obtaining synchronized data, if after the circuit breaker tripping at circuit ij two ends, enter step 2; Wherein: circuit ij connects i transformer station and j transformer station; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number;
Step 2, wide area backup protection system-computed correction impedance M ty -1m-zi j; Wherein: zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; M tfor the transposed matrix of Metzler matrix;
Step 3, wide area backup protection system-computed correction admittance M (M ty -1m-z ij) -1m t; Wherein: zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are all 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; M tfor the transposed matrix of Metzler matrix;
Step 4, wide area backup protection system-computed bucking voltage wherein: n is electricity grid substation total number; for n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 ..., n-2, n-1, n transformer station Injection Current phasor;
Step 5, the voltage phasor of the each transformer station of electrical network after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends U · = Y - 1 I · - Y - 1 M ( M T Y - 1 M - z ij ) - 1 M T Y - 1 I · ; Wherein: U · = U · 1 U · 2 U · 3 . . . U · n - 2 U · n - 1 U · n T For n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 after the circuit breaker tripping at circuit ij two ends ..., n-2, n-1, n transformer station voltage phasor;
Step 6, the electric current flowing through on circuit lk after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends and judgement whether set up, if set up, wide area backup protection system, sends block signal to the circuit breaker at circuit lk two ends, prevent circuit overload protection misoperation if judging that circuit lk is regular link; Wherein: l=1 ..., n; K=1 ..., n; N is electricity grid substation total number; z lkfor the line impedance of circuit lk; I setfor setting current threshold value; after circuit breaker tripping for circuit ij two ends, existing WAMS measures the electric current flowing through on circuit lk; Circuit lk connects l transformer station and k transformer station; be respectively the voltage phasor of l transformer station after the circuit breaker tripping at circuit ij two ends, k transformer station.
The technical program is compared with background technology, and its tool has the following advantages:
After the present invention utilizes the existing WAMS of electrical network to realize uniline tripping operation, electric network swim shifts the relay protection function that causes circuit overload false action-proof.The inventive method is when after the tripping of electrical network uniline, topological structure of electric changes, just can directly calculate each the electric current that line flows is crossed after the tripping of electrical network uniline without revising electrical network admittance matrix, whole computational process can complete within the 200ms time, protection quick action, faster than the existing line backup protection algorithm based on this locality amount decision-making, can be by reliable circuit locking before circuit overload is protected misoperation, after effectively preventing the tripping operation of electrical network uniline, trend transfer causes that All other routes overload is excised by mistake, effectively prevent the generation of electric grid large area power cut accident.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is application circuit transmission system schematic diagram of the present invention.
Embodiment
Please refer to Fig. 1,
Wide area backup protection system utilizes the existing WAMS of electrical network to realize the synchro measure of the each transformer substation voltage phasor of electrical network, electric current phasor, Real-time Obtaining synchronized data.
If after the circuit breaker tripping at circuit ij two ends, wide area backup protection system-computed correction impedance M ty -1m-zi j; Wherein: circuit ij connects i transformer station and j transformer station; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; Zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; M tfor the transposed matrix of Metzler matrix;
And then, wide area backup protection system-computed correction admittance M (M ty -1m-z ij) -1m t; Wherein: zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are all 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; M tfor the transposed matrix of Metzler matrix;
And then, wide area backup protection system-computed bucking voltage wherein: n is electricity grid substation total number; for n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 ..., n-2, n-1, n transformer station Injection Current phasor;
And then, the voltage phasor of the each transformer station of electrical network after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends U · = Y - 1 I · - Y - 1 M ( M T Y - 1 M - z ij ) - 1 M T Y - 1 I · ; Wherein: U · = U · 1 U · 2 U · 3 . . . U · n - 2 U · n - 1 U · n T For n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 after the circuit breaker tripping at circuit ij two ends ..., n-2, n-1, n transformer station voltage phasor;
Finally, the electric current flowing through on circuit lk after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends and judgement whether set up, if set up, wide area backup protection system, sends block signal to the circuit breaker at circuit lk two ends, prevent circuit overload protection misoperation if judging that circuit lk is regular link; Wherein: l=1 ..., n; K=1 ..., n; N is electricity grid substation total number; z lkfor the line impedance of circuit lk; I setfor setting current threshold value; after circuit breaker tripping for circuit ij two ends, existing WAMS measures the electric current flowing through on circuit lk; Circuit lk connects l transformer station and k transformer station; be respectively the voltage phasor of l transformer station after the circuit breaker tripping at circuit ij two ends, k transformer station.
After the present invention utilizes the existing WAMS of electrical network to realize uniline tripping operation, electric network swim shifts the relay protection function that causes circuit overload faulty action preventing.The inventive method is when after the tripping of electrical network uniline, topological structure of electric changes, just can directly calculate each the electric current that line flows is crossed after the tripping of electrical network uniline without revising electrical network admittance matrix, whole computational process can complete within the 200ms time, protection quick action, faster than the existing line backup protection algorithm based on this locality amount decision-making, can be by reliable circuit locking before circuit overload is protected misoperation, after effectively preventing the tripping operation of electrical network uniline, trend transfer causes that All other routes overload is excised by mistake, effectively prevent the generation of electric grid large area power cut accident.
The above, only for preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of doing according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.

Claims (1)

1. the power network line overload faulty action preventing relay protecting method based on Wide-area Measurement Information, is characterized in that, comprises following sequential steps:
Step 1, wide area backup protection system utilizes the existing WAMS of electrical network to realize the synchro measure of the each transformer substation voltage phasor of electrical network, electric current phasor, and Real-time Obtaining synchronized data, if after the circuit breaker tripping at circuit ij two ends, enter step 2; Wherein: circuit ij connects i transformer station and j transformer station; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number;
Step 2, wide area backup protection system-computed correction impedance M ty -1m-zi j; Wherein: zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number; M tfor the transposed matrix of Metzler matrix;
Step 3, wide area backup protection system-computed correction admittance M (M ty -1m-z ij) -1m t; Wherein: zi jfor the line impedance of circuit ij; Y is electrical network admittance matrix; M=[0 ... 1 ...-1 ... 0] tfor n × 1 dimension matrix, in Metzler matrix, capable the 1st column element of i is 1, and in Metzler matrix, capable the 1st column element of j is-1, and other elements are all 0; I=1 ..., n; J=1 ..., n; N is electricity grid substation total number;
Step 4, wide area backup protection system-computed bucking voltage wherein: n is electricity grid substation total number; for n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 ..., n-2, n-1, n transformer station Injection Current phasor;
Step 5, the voltage phasor of the each transformer station of electrical network after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends U · = Y - 1 I · - Y - 1 M ( M T Y - 1 M - z ij ) - 1 M T Y - 1 I · ; Wherein: U · = U · 1 U · 2 U · 3 . . . U · n - 2 U · n - 1 U · n T For n × 1 dimension matrix, be respectively and be numbered the the 1st, 2,3 after the circuit breaker tripping at circuit ij two ends ..., n-2, n-1, n transformer station voltage phasor;
Step 6, the electric current flowing through on circuit lk after the circuit breaker tripping at wide area backup protection system-computed circuit ij two ends and judgement whether set up, if set up, wide area backup protection system, sends block signal to the circuit breaker at circuit lk two ends, prevent circuit overload protection misoperation if judging that circuit lk is regular link; Wherein: l=1 ..., n; K=1 ..., n; N is electricity grid substation total number; z lkfor the line impedance of circuit lk; I setfor setting current threshold value; after circuit breaker tripping for circuit ij two ends, existing WAMS measures the electric current flowing through on circuit lk; Circuit lk connects l transformer station and k transformer station; be respectively the voltage phasor of l transformer station after the circuit breaker tripping at circuit ij two ends, k transformer station.
CN201410053664.4A 2014-02-18 2014-02-18 Grid circuit overload maloperation-preventing relay protection method based on wide-area information CN103779853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410053664.4A CN103779853A (en) 2014-02-18 2014-02-18 Grid circuit overload maloperation-preventing relay protection method based on wide-area information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410053664.4A CN103779853A (en) 2014-02-18 2014-02-18 Grid circuit overload maloperation-preventing relay protection method based on wide-area information

Publications (1)

Publication Number Publication Date
CN103779853A true CN103779853A (en) 2014-05-07

Family

ID=50571823

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410053664.4A CN103779853A (en) 2014-02-18 2014-02-18 Grid circuit overload maloperation-preventing relay protection method based on wide-area information

Country Status (1)

Country Link
CN (1) CN103779853A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104092194A (en) * 2014-07-15 2014-10-08 国家电网公司 Power grid circuit wide-area current protection method
CN104332971A (en) * 2014-11-12 2015-02-04 国家电网公司 Grid line wide-area backup protection method applicable to double-line tripping

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101409442A (en) * 2008-11-25 2009-04-15 中国南方电网有限责任公司 Rapid line backup protection method with reliable selection based on wide area measuring system
CN101741072A (en) * 2009-12-25 2010-06-16 华北电力大学 Method for fault component-based wide area backup protection
CN101872964A (en) * 2010-07-02 2010-10-27 华北电力大学 Wide area measurement system based back-up protection method of multi-terminal high-voltage power transmission area

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101409442A (en) * 2008-11-25 2009-04-15 中国南方电网有限责任公司 Rapid line backup protection method with reliable selection based on wide area measuring system
CN101741072A (en) * 2009-12-25 2010-06-16 华北电力大学 Method for fault component-based wide area backup protection
CN101872964A (en) * 2010-07-02 2010-10-27 华北电力大学 Wide area measurement system based back-up protection method of multi-terminal high-voltage power transmission area

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
徐慧明等: "基于潮流转移因子的广域后备保护方案", 《电网技术》 *
谷松林等: "基于保护关联域的防连锁跳闸策略", 《中国电机工程学报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104092194A (en) * 2014-07-15 2014-10-08 国家电网公司 Power grid circuit wide-area current protection method
CN104332971A (en) * 2014-11-12 2015-02-04 国家电网公司 Grid line wide-area backup protection method applicable to double-line tripping

Similar Documents

Publication Publication Date Title
Memon et al. A critical review of AC Microgrid protection issues and available solutions
US10153635B2 (en) System for detecting a falling electric power conductor and related methods
Jovcic et al. Feasibility of DC transmission networks
CN102611086B (en) Centralized protection system and method for region distribution network
US8842401B2 (en) Protection system for an electrical power network
CN102388315B (en) For identifying the method for the nature of trouble on line of electric force
CA2446876C (en) Protection of an electric power transmission network
CN102035202B (en) Network reconfiguration system
CN1505862B (en) Protection of electrical power lines
CN102608495B (en) Fault phase selection method based on current break variable
CN107636921B (en) Method and apparatus for detecting failure in mixed configuration transmission line of electricity
US9823637B2 (en) Fault detection and isolation using a common reference clock
EP2686691B1 (en) A method for detecting earth faults
CN101938117B (en) Current differential protection method for smart distribution network
CN105281435B (en) Distributed fault detection and shielding system and method for work towards intelligent distribution network
CN101860000B (en) Quick identification method for permanent fault before single-phase reclosing of power transmission line
CN103326335B (en) System and method for false action resistance of distance section III based on domain double-type fault characteristic
EP2331978B1 (en) Method and device for supervising secondary circuit of instrument transformer in power system
CN101409442B (en) Rapid line backup protection method with reliable selection based on wide area measuring system
CN101350520B (en) Protection control system and method base on electric network synthesis information
CN101325331B (en) Method for implementing element for measuring distance between phases without relevance to load current and ground resistance
CN103308824B (en) Power system fault diagnostic method based on probability Petri net
CN104198884B (en) Differential principle based large-scale power grid intelligent trouble diagnosis method
CN102570454B (en) Simulation collocation method for oscillation disconnection device of power system
CN100595990C (en) Method for configuring PMU taking regard of high risk cascading failure path

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20140507