CN109245044A - A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method - Google Patents

A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method Download PDF

Info

Publication number
CN109245044A
CN109245044A CN201811101937.2A CN201811101937A CN109245044A CN 109245044 A CN109245044 A CN 109245044A CN 201811101937 A CN201811101937 A CN 201811101937A CN 109245044 A CN109245044 A CN 109245044A
Authority
CN
China
Prior art keywords
sequence impedance
equivalent
head end
voltage
distribution network
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
CN201811101937.2A
Other languages
Chinese (zh)
Other versions
CN109245044B (en
Inventor
段建东
陈童
何鱼
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.)
Xian University of Technology
Original Assignee
Xian University of Technology
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 Xian University of Technology filed Critical Xian University of Technology
Priority to CN201811101937.2A priority Critical patent/CN109245044B/en
Publication of CN109245044A publication Critical patent/CN109245044A/en
Application granted granted Critical
Publication of CN109245044B publication Critical patent/CN109245044B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02H3/40—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 responsive to ratio of voltage and current
    • H02H3/405—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 responsive to ratio of voltage and current using phase sequence analysing arrangements
    • 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

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a kind of power distribution network equivalent sequence impedance longitudinal linkage protection methods; the following steps are included: the starting protected using the Sudden Changing Rate of the distinctive negative-sequence current in the case where unbalanced fault occurs; the false voltage and fault current of acquisition carry out order components decomposition; the Sudden Changing Rate of positive-negative sequence voltage and current is found out, the ratio between equivalent positive-negative sequence impedance and equivalent sequence impedance ρ is then calculatedsf,ρDGf, obtain ρf, when judgement meets Protection criteria, then can determine that and troubles inside the sample space have occurred for the specific route of power distribution network, the breaker that protective device sending protection signal acts on route carrys out the failure that both-end cuts off the route；If being unsatisfactory for Protection criteria, it can determine that for external area error, then the protection of this section of route two sides is failure to actuate.The present invention accesses power distribution network for distributed generation resource, and the method provided effectively can reliably differentiate the internal fault external fault of route, has certain application value in practical projects.

Description

A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method
Technical field
The invention belongs to power distribution network relay protecting method technical fields, and in particular to a kind of power distribution network equivalent sequence impedance longitudinal linkage Guard method.
Background technique
The problems such as environmental pollution, climate change, energy security and sustainable development, becomes increasingly conspicuous, and global major country has been incited somebody to action New energy is included in national energy and first develops strategy, and generation of electricity by new energy has welcome development opportunity.Using generation of electricity by new energy at For the principal mode of power generation, new vigor is filled with to electric power.But generation of electricity by new energy equally also brings challenge.
After accessing power distribution network for distributed wind-power generator, for the power quality of power distribution network, trend, protection, reclosing Etc. all bring some detrimental effects.Traditional power distribution network accesses distributed wind random, uncertain and that fluctuation is big After power generation, so that single-ended power distribution network becomes the new distribution net of multiterminal multi-source, trend, which also has, flowed to load by substation originally Single direction become multidirectional flowing.According to radial pattern structure, the biography of unidirectional short circuit current and time phase delayed setting The three sect current protection of power grid under unified central planning no longer adapts to new distribution web form, the numerous problems faced.
Distribution protection method after the existing access power distribution network for double-fed induction wind power supply mainly has:
(1) certain limitation has been carried out for the position and output capacity of the access power distribution network of distributed generation resource, then Certain adjustment is carried out to original current protection definite value, make its will not it is original to power distribution network protection impact；(2) it proposes Protection scheme based on communication can make full use of multiple spot information by way of communication to configure and adjust according in real time Protection.(3) a kind of scheme of adaptive Current Protection is proposed, adaptive adjustment is whole according to the method for operation and DG power output situation Definite value, the method improve the randomnesss because of DG, and conventional current fast tripping protection definite value to be made to be difficult to the problem of adjusting, so that protecting Shield performance is greatly improved；(4) the short-circuit transient characterisitics for analyzing doubly-fed wind turbine, utilize its own and system Big different configuration pilot protection of the power supply in transient characterisitics, can accurately identify failure occur in the area of protected circuit, Outside.
For limiting in (1) for the position of distributed generation resource and output capacity, it is new for developing country is not met The purpose of the energy is unfavorable for new energy development.(2) mode that communication is utilized in handles the failure of power distribution network, protection The feasibility requirement of communication is higher, once communication failure or information are wrong, protection will fail.(3) it needs to believe by communication Road obtains auto-adaptive parameter in real time, and anti-transition resistance is indifferent.(4) occur not about double feed wind power generator in route Characteristic when symmetric fault also requires study.In conclusion the protection side of the existing power distribution network to double feed wind power generator Method is difficult have actual engineering application value, does not have universality.It requires further study.
Summary of the invention
It is an object of the present invention to provide a kind of power distribution network equivalent sequence impedance longitudinal linkage protection methods, solve currently existing technology and work as In for being connected to the technical problems such as the guard method of the power distribution network of DFIG is excessively complicated, does not adapt to DFIG frequency bias properties.
The technical solution adopted by the present invention is that a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method, specifically according to following Step is implemented:
Step 1: head end breaker is acquired by the power distribution network head end voltage current transformer of the wind turbine of type containing DFIG respectively The charged flow valuve of the voltage at place, and the voltage and current value measured is transmitted to head end programmable processor respectively；Pass through end electricity Voltage current transformer acquires the voltage and current value at the breaker of end respectively, and the voltage and current value measured is transmitted respectively To head end can end programmable processor, carry out data processing；
Step 2: head end programmable processor issues regulation and control instruction to head end open circuit according to step 1 data processed result respectively Device movement controller controls head end breaker, and end programmable processor issues tune according to step 1 data processed result respectively Control instruction controls end breaker to end breaker actuation controller, realizes the power distribution network pilot protection of DFIG type blower.
The features of the present invention also characterized in that
Step 1 carries out data processing detailed process are as follows:
Step 1.1: and then order components decomposition is carried out to the voltage and current of acquisition, it is disconnected to respectively obtain head end breaker head end Equivalent positive sequence impedance Z at the device of roadS1With equivalent negative phase-sequence impedance ZS2, equivalent positive sequence impedance Z at the breaker of endW1And equivalent negative Sequence impedance ZW2,
To the equivalent positive sequence impedance Z at the breaker of endW1With equivalent negative phase-sequence impedance ZW2It does and compares, be denoted as ρDGf,
To the equivalent positive sequence impedance Z at head end breakerS1With equivalent negative phase-sequence impedance ZS2It does and compares, be denoted as ρsf,
Step 1.2: calculating ρsf, ρDGfBetween ratio, by ratio and ρSETIt is compared, ρSETIt is 1.2, to realize route Pilot protection:
1) whenIt is determined as failure to occur between route, the protective device at route both ends acts, cutting Failure；
2) whenIt is determined as failure to occur except route, the protective device at route both ends is failure to actuate.
Equivalent positive sequence impedance ZW1Are as follows:
Equivalent negative phase-sequence impedance ZW2Are as follows:
In formula, Rs、RrThe respectively rotor side resistance of motor stator side resistance and reduction to stator side；Xsσ、XrσRespectively The anti-rotor leakage reactance with reduction to stator side of motor stator side leakage；XmFor the excitation reactance of motor；RcrFor crowbar circuit resistance；s For revolutional slip, revolutional slip range generally 0≤| s |≤1；Us1、Us2Respectively motor generator terminal positive sequence voltage and negative sequence voltage, j are Imaginary unit.
The distribution network system of DFIG type wind turbine includes power supply, and power supply is connect by step-down transformer with the first bus, the One bus is connected by route with the second bus, is connected to DFIG wind turbine by step-up transformer at the second bus；In the first mother The exit of line is provided with head end breaker and detects the voltage current transformer of head end circuit breaker voltage current value, head end open circuit Device is connected with head end breaker actuation controller, head end voltage current transformer and head end breaker actuation controller with head Hold programmable processor connection；The exit of second bus is provided with voltage electricity at end breaker and detection end breaker The terminal voltage current transformer of flow valuve, end breaker are connected with end breaker actuation controller, terminal voltage electric current Mutual inductor and end breaker actuation controller are connected with end programmable processor.
The invention has the advantages that a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method of the invention and the prior art The advantage compared is the following；1) for pilot protection is utilized in dual power supply form, DFIG frequency shift (FS) is avoided Bring influences, and calculating process is simple and quick, does not need extra data processing, and the practicability in power distribution network is high.2) it is directed to The transient characterisitics of asymmetry short circuit fault increase the reliability of protection, avoid and protect in dual power supply power distribution network The case where can not identifying unsymmetrical short-circuit.
Detailed description of the invention
Fig. 1 is the distribution network system structural schematic diagram of the invention containing DFIG type wind-driven generator；
Fig. 2 is the power distribution network longitudinal protection method flow chart of the invention containing distributed DFIG type wind-driven generator；
Fig. 3 is the implementation of the power distribution network longitudinal protection method of the invention containing distributed DFIG type wind-driven generator Figure；
Fig. 4 (a) be wind-driven generator of the present invention power distribution network in two-phase short-circuit fault at head end breaker just Negative phase-sequence equivalent impedance；
Fig. 4 (b) be wind-driven generator of the present invention power distribution network in two-phase short-circuit fault at head end breaker just The ratio of negative phase-sequence equivalent impedance；
Fig. 4 (c) is the power distribution network of wind-driven generator of the invention at two-phase short-circuit fault situation lower end breaker Positive-negative sequence equivalent impedance schematic diagram；
Fig. 4 (d) is the power distribution network of wind-driven generator of the invention at two-phase short-circuit fault situation lower end breaker The ratio of positive-negative sequence equivalent impedance；
Fig. 4 (e) be wind-driven generator of the invention power distribution network two-phase short-circuit fault in the case of head end breaker and end The ratio between the ratio of the positive-negative sequence impedance of breaker；
Fig. 5 (a) is wind-driven generator positive sequence equivalent circuit of the invention；
Fig. 5 (b) is wind-driven generator negative phase-sequence equivalent circuit of the invention.
Wherein, 1. power supply, 2. step-down transformers, 3. first buses, 4. head end breakers, 5. routes, 6. head end voltages electricity Current transformer, 7. head end programmable processors, 8. head end breaker actuation controllers, 9. end breakers, 10. end mutual inductances Device, 11. end programmable processors, 12. end breaker actuation controller, 13. second bus, 14.DFIG wind turbine, 15. liters Pressure transformer.
Specific embodiment
Below with reference to relevant drawings, next specific embodiments of the present invention will be described in further detail:
As shown in Figure 1, the distribution network system of DFIG type wind turbine includes power supply 1, power supply 1 passes through step-down transformer 2 and the The connection of one bus 3, the first bus 3 are connected by route 5 with the second bus 13, are connect at the second bus 13 by step-up transformer 15 There is DFIG wind turbine 14；The exit of first bus 3 is provided with head end breaker 4 and detection 4 voltage and current of head end breaker The voltage current transformer 6 of value, head end breaker 4 are connected with head end breaker actuation controller 8, head end voltage Current Mutual Inductance Device 6 and head end breaker actuation controller 8 are connect with head end programmable processor 7；It is arranged in the exit of the second bus 13 There is end breaker 9 and detects the terminal voltage current transformer 10 of voltage and current value at end breaker 9, end breaker 9 It is connected with end breaker actuation controller 12, terminal voltage current transformer 10 and end breaker actuation controller 12 are equal It is connected with end programmable processor 11.
A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method of the invention, is specifically implemented according to the following steps:
Step 1: head end breaker is acquired by the power distribution network head end voltage current transformer 6 of the wind turbine of type containing DFIG respectively The charged flow valuve of voltage at 4, and the voltage and current value measured is transmitted to head end programmable processor 7 respectively；Pass through end Voltage current transformer 10 acquires the voltage and current value at end breaker 4 respectively, and the voltage and current value measured is divided Supplementary biography be delivered to head end can end programmable processor 11, carry out data processing, data handling procedure is specific as follows:
Step 1.1: false voltage and fault current to acquisition carry out order components decomposition, are finding out head end breaker 4 just The positive-negative sequence voltage jump amount of negative sequence voltage Sudden Changing Rate, the Sudden Changing Rate of positive-negative sequence current and end breaker 9, positive-negative sequence current Then Sudden Changing Rate calculates the equivalent positive sequence impedance Z at head end breaker 4S1With equivalent negative phase-sequence impedance ZS2, at end breaker 9 ZW1With equivalent negative phase-sequence impedance ZW2,
To the equivalent positive sequence impedance Z at end breaker (9)W1With equivalent negative phase-sequence impedance ZW2It does and compares, be denoted as ρDGf,
To the equivalent positive sequence impedance Z at head end breaker (4)S1With equivalent negative phase-sequence impedance ZS2It does and compares, be denoted as ρsf,
Step 1.2: calculating ρsf, ρDGfBetween ratio, by ratio and ρSETIt is compared, ρSETIt is 1.2, to realize route Pilot protection:
1) whenIt is determined as failure to occur between route, the protective device at route both ends acts, cutting Failure；
2) whenIt is determined as failure to occur except route, the protective device at route both ends is failure to actuate.
ρSETBasis for 1.2: establishing analogue system in PSCAD/EMTDC, with the access of Chinese seat of honour distributing wind power plant The exemplary engineering of the place 10kV power distribution network is prototype.Then pass through setting different types of faults, different fan capacities, different events Hinder position, all calculates action value each time, there are certain allowances, select end value for 1.2.
Equivalent positive sequence impedance ZW1With equivalent negative phase-sequence impedance ZW2Respectively
Equivalent positive sequence impedance ZW1Are as follows:
Equivalent negative phase-sequence impedance ZW2Are as follows:
In formula, Rs、RrThe respectively rotor side resistance of motor stator side resistance and reduction to stator side；Xsσ、XrσRespectively The anti-rotor leakage reactance with reduction to stator side of motor stator side leakage；XmFor the excitation reactance of motor；RcrFor crowbar circuit resistance；s For revolutional slip, revolutional slip range generally 0≤| s |≤1；Us1、Us2Respectively motor generator terminal positive sequence voltage and negative sequence voltage, j are Imaginary unit.
Motor generator terminal is exactly motor exit.
Step 2: head end programmable processor 7 issues regulation and control instruction to head end according to step 1 data processed result respectively and breaks Road device movement controller 8 controls head end breaker 4, and end programmable processor 11 distinguishes according to step 1 data processed result It issues regulation and control instruction and controls end breaker 9 to end breaker actuation controller 12, realize the power distribution network of DFIG type blower Pilot protection.
Crowbar circuit puts into this operating condition after the present invention is directed to unbalanced fault, to doubly-fed wind turbine equivalent sequence impedance Characteristic is analyzed, and obtains equal different from the equivalent positive-negative sequence impedance magnitude of system power supply, and doubly-fed wind turbine is equivalent positive and negative Sequence impedance magnitude significant difference, and its equivalent positive sequence impedance amplitude is much larger than negative sequence impedance amplitude.It proposes on this basis Pilot protection scheme based on distribution line two sides power supply equivalent sequence impedance magnitude difference.
Current DFIG induction wind driven generator 14 is all configured with low voltage ride-through function, when breaking down outside blower, Motor enters asynchronous operation state, and doubly-fed wind turbine can be equivalent to asynchronous machine, the equivalent positive-negative sequence electricity in end at this time Shown in road such as Fig. 5 (a) and Fig. 5 (b):
Equivalent positive sequence impedance ZW1Are as follows:
Equivalent negative phase-sequence impedance ZW2Are as follows:
In formula, Rs、RrThe respectively rotor side resistance of motor stator side resistance and reduction to stator side；Xsσ、XrσRespectively The anti-rotor leakage reactance with reduction to stator side of motor stator side leakage；XmFor the excitation reactance of motor；RcrFor crowbar circuit resistance；s For revolutional slip, revolutional slip range generally 0≤| s |≤1；Us1、Us2Respectively motor generator terminal positive sequence voltage and negative sequence voltage, j are Constant.
As shown from the above formula, equivalent positive-negative sequence impedance magnitude is related with revolutional slip s, revolutional slip range generally 0≤| s | ≤ 1, the equivalent positive-negative sequence impedance of doubly-fed wind turbine is no longer equal after must being out of order, and equivalent positive sequence impedance be far longer than it is equivalent Negative sequence impedance.
Above-mentioned derivation is exactly, positive and negative sequence resistance unequal in order to illustrate the positive and negative sequence impedance of double-fed induction wind-driven generator Anti- ratio is not 1, this has very big difference with system power supply 1；The positive and negative sequence impedance of system power supply 1 is all definite value, and equal, So ratio is 1, so the core of the application is that, the power supply on route both sides is system power supply 1 and double-fed induction respectively Wind-driven generator 14, after the failure occurred, the positive and negative sequence impedance ratio of system power supply is close to 1, and double-fed induction wind-power electricity generation The positive and negative sequence impedance of machine is far longer than 1, using such difference, can determine the route generation in the centre of two power supplys Failure.
Embodiment:
Step 1: the big power supply shown in Fig. 4 (a)-Fig. 4 (d) is surveyed for two-phase is through transition resistance eutral grounding failure Examination, is filtered current waveform, filters out serious wave distortion point, and Fig. 4 (e) is route two sides equivalent sequence impedance magnitude than it Than.
Step 2: above-mentioned data being calculated, order components decomposition is carried out to false voltage and fault current, is found out positive and negative Then the Sudden Changing Rate of sequence voltage and electric current calculates the ratio between equivalent positive-negative sequence impedance and equivalent sequence impedance ρsf,ρDGf
Step 3: respectively to the equivalent positive sequence impedance Z at head end breaker 4s1, equivalent negative phase-sequence impedance Zs2It does and compares, be denoted as ρsf To the equivalent positive sequence impedance Z at end breaker 9w1, equivalent negative phase-sequence impedance Zw2It does and compares, be denoted as ρDGf, it is calculated
Step 4: in view of measurement error in practice, the ρ of setting setting hereSET=1.2,1.2 here are by emulation Verifying, the conclusion obtained according to a large amount of test data.
Step 5: for protective value a large amount of under different operating conditions, test result is as follows shown in table.
1 head end breaker of table and end breaker phase fault test result
2 two-phase short circuit and ground fault test result of table
Table 3 has transition resistance situation test result
A large amount of emulation testings are carried out to certain engineering of double-fed fan motor field access power distribution network, the results showed that the protection scheme is not It,, can in the case of the active output of different wind power plants and different faults resistance for different faults type under symmetric fault By correctly acting.

Claims (4)

1. a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method, is specifically implemented according to the following steps:
Step 1: head end breaker is acquired by the power distribution network head end voltage current transformer (6) of the wind turbine of type containing DFIG respectively (4) the charged flow valuve of voltage at, and the voltage and current value measured is transmitted to head end programmable processor (7) respectively；Pass through Terminal voltage current transformer (10) acquires the voltage and current value at end breaker (4) respectively, and by the voltage measured and Current value be transmitted to respectively head end can end programmable processor (11), carry out data processing；
Step 2: head end programmable processor (7) issues regulation and control instruction to head end open circuit according to step 1 data processed result respectively Device movement controller (8) controls head end breaker (4), and end programmable processor (11) is according to step 1 data processed result Regulation and control instruction is issued respectively to control to end breaker actuation controller (12) end breaker (9), realizes DFIG type blower Power distribution network pilot protection.
2. a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method according to claim 1, the step 1 is carried out at data Manage detailed process are as follows:
Step 1.1: and then order components decomposition is carried out to the voltage and current of acquisition, it is disconnected to respectively obtain head end breaker (4) head end Equivalent positive sequence impedance Z at road device (4)S1With equivalent negative phase-sequence impedance ZS2, equivalent positive sequence impedance Z at end breaker (9)W1With Equivalent negative phase-sequence impedance ZW2,
To the equivalent positive sequence impedance Z at end breaker (9)W1With equivalent negative phase-sequence impedance ZW2It does and compares, be denoted as ρDGf,
To the equivalent positive sequence impedance Z at head end breaker (4)S1With equivalent negative phase-sequence impedance ZS2It does and compares, be denoted as ρsf,
Step 1.2: calculating ρsf, ρDGfBetween ratio, by ratio and ρSETIt is compared, ρSETIt is 1.2, to realize the vertical of route UNPROFOR shield:
1) whenIt is determined as failure to occur between route, the protective device at route both ends acts, disengagement failure；
2) whenIt is determined as failure to occur except route, the protective device at route both ends is failure to actuate.
3. a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method according to claim 2, the equivalent positive sequence impedance ZW1 With equivalent negative phase-sequence impedance ZW2Respectively
Equivalent positive sequence impedance ZW1Are as follows:
Equivalent negative phase-sequence impedance ZW2Are as follows:
In formula, Rs、RrThe respectively rotor side resistance of motor stator side resistance and reduction to stator side；Xsσ、XrσRespectively motor The rotor leakage reactance of stator side leakage reactance and reduction to stator side；XmFor the excitation reactance of motor；RcrFor crowbar circuit resistance；S is to turn Rate, revolutional slip range generally 0≤| s |≤1；Us1、Us2Respectively motor generator terminal positive sequence voltage and negative sequence voltage, j are imaginary number Unit.
4. a kind of power distribution network equivalent sequence impedance longitudinal linkage protection method according to claim 1, which is characterized in that the DFIG The distribution network system of type wind turbine includes power supply (1), and the power supply (1) is connected by step-down transformer (2) and the first bus (3) It connects, first bus (3) is connected by route (5) with the second bus (13), is become at second bus (13) by boosting Depressor (15) is connected to DFIG wind turbine (14)；The exit of first bus (3) is provided with head end breaker (4) and detection The voltage current transformer (6) of head end breaker (4) voltage and current value, head end breaker (4) and head end breaker actuation control Device (8) is connected, and head end voltage current transformer (6) and head end breaker actuation controller (8) may be programmed processing with head end Device (7) connection；It is provided at end breaker (9) and detection end breaker (9) in the exit of second bus (13) The terminal voltage current transformer (10) of voltage and current value, end breaker (9) and end breaker actuation controller (12) phase Connection, terminal voltage current transformer (10) and end breaker actuation controller (12) with end programmable processor (11) It is connected.
CN201811101937.2A 2018-09-20 2018-09-20 A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method Active CN109245044B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811101937.2A CN109245044B (en) 2018-09-20 2018-09-20 A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811101937.2A CN109245044B (en) 2018-09-20 2018-09-20 A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method

Publications (2)

Publication Number Publication Date
CN109245044A true CN109245044A (en) 2019-01-18
CN109245044B CN109245044B (en) 2019-11-22

Family

ID=65059765

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811101937.2A Active CN109245044B (en) 2018-09-20 2018-09-20 A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method

Country Status (1)

Country Link
CN (1) CN109245044B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111323733A (en) * 2020-03-23 2020-06-23 贵州电网有限责任公司 Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal
CN111562516A (en) * 2020-05-27 2020-08-21 南方电网科学研究院有限责任公司 Method, system and equipment for judging power supply fault based on sequence mutation impedance
CN112260242A (en) * 2020-09-18 2021-01-22 西安理工大学 Pilot protection method for DFIG-containing power distribution network line
CN112345977A (en) * 2020-10-21 2021-02-09 河南华润电力首阳山有限公司 Electrical equipment and PT secondary circuit disconnection judgment method, system and device thereof
CN113437732A (en) * 2021-08-30 2021-09-24 国网江西省电力有限公司电力科学研究院 Pilot protection method and system for photovoltaic power generation grid-connected tie line
CN114530831A (en) * 2022-01-13 2022-05-24 西安理工大学 Pilot protection system and pilot protection method for double-fed fan to access flexible direct current

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101295874A (en) * 2008-04-15 2008-10-29 烟台东方电子信息产业股份有限公司 Electric power line pilot protection decision method based on fault component positive sequence synthetic impedance
CN105119270A (en) * 2015-07-30 2015-12-02 国家电网公司 Method of analyzing the influence of mass wind power accessing on directional comparison pilot protection
CN105846408A (en) * 2016-05-16 2016-08-10 西安理工大学 Pilot protection method for power distribution network having distributed DFIG type wind motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101295874A (en) * 2008-04-15 2008-10-29 烟台东方电子信息产业股份有限公司 Electric power line pilot protection decision method based on fault component positive sequence synthetic impedance
CN105119270A (en) * 2015-07-30 2015-12-02 国家电网公司 Method of analyzing the influence of mass wind power accessing on directional comparison pilot protection
CN105846408A (en) * 2016-05-16 2016-08-10 西安理工大学 Pilot protection method for power distribution network having distributed DFIG type wind motor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111323733A (en) * 2020-03-23 2020-06-23 贵州电网有限责任公司 Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal
CN111323733B (en) * 2020-03-23 2021-12-07 贵州电网有限责任公司 Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal
CN111562516A (en) * 2020-05-27 2020-08-21 南方电网科学研究院有限责任公司 Method, system and equipment for judging power supply fault based on sequence mutation impedance
CN112260242A (en) * 2020-09-18 2021-01-22 西安理工大学 Pilot protection method for DFIG-containing power distribution network line
CN112260242B (en) * 2020-09-18 2022-09-13 西安理工大学 Pilot protection method for DFIG-containing power distribution network line
CN112345977A (en) * 2020-10-21 2021-02-09 河南华润电力首阳山有限公司 Electrical equipment and PT secondary circuit disconnection judgment method, system and device thereof
CN112345977B (en) * 2020-10-21 2023-11-24 河南华润电力首阳山有限公司 Electrical equipment and PT secondary circuit disconnection judging method, system and device thereof
CN113437732A (en) * 2021-08-30 2021-09-24 国网江西省电力有限公司电力科学研究院 Pilot protection method and system for photovoltaic power generation grid-connected tie line
CN113437732B (en) * 2021-08-30 2021-12-31 国网江西省电力有限公司电力科学研究院 Pilot protection method and system for photovoltaic power generation grid-connected tie line
CN114530831A (en) * 2022-01-13 2022-05-24 西安理工大学 Pilot protection system and pilot protection method for double-fed fan to access flexible direct current

Also Published As

Publication number Publication date
CN109245044B (en) 2019-11-22

Similar Documents

Publication Publication Date Title
CN109245044B (en) A kind of power distribution network equivalent sequence impedance longitudinal linkage protection method
Fang et al. Impact of inverter-interfaced renewable energy generators on distance protection and an improved scheme
CN105375532B (en) A kind of fault phase-selecting method suitable for double-fed fan motor field interconnection
CN108493907B (en) A kind of Amplitude Comparison guard method being adapted to active power distribution network
Eissa Protection techniques with renewable resources and smart grids—A survey
Rezaei et al. An analytical review on state-of-the-art microgrid protective relaying and coordination techniques
CN101702512B (en) Negative sequence impedance direction protection method for interior failures of stator winding of steamer generator
CN101701998A (en) Novel faulty line selection method in low current faulty grounding system
CN111900704A (en) Active power distribution network current differential protection method and device without strict data synchronization
Feltes et al. Wind turbine generator dynamic performance with weak transmission grids
CN113484665B (en) Fault point positioning method in single-phase earth fault
CN110880743B (en) Kendel rank correlation-based pilot protection method for outgoing line of wind power plant
CN109581148B (en) Fault phase selection method for new energy electric field tie line
Han et al. An improved pilot protection for distribution network with inverter-interfaced distributed generations
CN106786419B (en) Wind power plant based on station domain protection philosophy collects system relay protection method
CN110048372B (en) Improved high-voltage generator stator single-phase earth fault protection method
CN110504664A (en) Power distribution network containing distributed generation resource adaptively prescribe a time limit forward-order current fast tripping protection method
CN109884476B (en) Method for judging fault direction of tie line suitable for double-fed power access
CN116316488B (en) Protection configuration and parameter setting method for wind farm fan collecting system
CN112731211A (en) Grounding transformer low-voltage winding turn-to-turn short circuit fault and phase identification method
CN105790251B (en) Method for determining transient current of key equipment of +/-10 kV flexible direct-current power distribution network
CN110492438A (en) A kind of wind power plant main transformer protection method based on instantaneous frequency difference
CN109861188B (en) Grounding protection method and system based on centralized new energy grid-connected mode
CN104749453A (en) Method for reducing influences imposed on user voltage sag by external grid single-phase grounding fault
Zhou et al. Research of impact of the direct drive wind farm on power system relay protection

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant