CN106253776B - Generator power pick-up device and delivering method based on comprehensive harmonic failure identification - Google Patents

Generator power pick-up device and delivering method based on comprehensive harmonic failure identification Download PDF

Info

Publication number
CN106253776B
CN106253776B CN201610729494.6A CN201610729494A CN106253776B CN 106253776 B CN106253776 B CN 106253776B CN 201610729494 A CN201610729494 A CN 201610729494A CN 106253776 B CN106253776 B CN 106253776B
Authority
CN
China
Prior art keywords
power
phase
generator
generator terminal
current
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.)
Active
Application number
CN201610729494.6A
Other languages
Chinese (zh)
Other versions
CN106253776A (en
Inventor
黄晓明
陈俊
杨涛
王光
陆承宇
李华忠
王松
王凯
方芳
柯人观
丁峰
汪冬辉
罗华峰
孙祥祥
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.)
NR Electric Co Ltd
NR Engineering Co Ltd
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
NR Electric Co Ltd
NR Engineering Co Ltd
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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 NR Electric Co Ltd, NR Engineering Co Ltd, Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd filed Critical NR Electric Co Ltd
Priority to CN201610729494.6A priority Critical patent/CN106253776B/en
Publication of CN106253776A publication Critical patent/CN106253776A/en
Application granted granted Critical
Publication of CN106253776B publication Critical patent/CN106253776B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/006—Means for protecting the generator by using control
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/20—Special adaptation of control arrangements for generators for steam-driven turbines

Abstract

The invention discloses a kind of generator power pick-up devices and delivering method based on comprehensive harmonic failure identification, and acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase current and generator terminal protected level current transformer three-phase current in real time first；The fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated separately again, generator terminal measures the fundamental phasors of grade current transformer three-phase current, the fundamental phasors of generator terminal protected level current transformer three-phase current, generator power 1, generator power 2 and measures the (n desirable 2,3 or 5) of nth harmonic component amplitude in grade current transformer three-phase current；Using harmonic component fault identification criterion, when criterion function input and criterion meet if output generator power 2, otherwise output generator power 1.The method can effectively solve the problems, such as that measuring grade CT easily saturations leads to output error power, exports correct power.

Description

Generator power pick-up device and delivering method based on comprehensive harmonic failure identification
Technical field
The invention belongs to field of power, more particularly to a kind of generator power based on comprehensive harmonic failure identification becomes Send device and delivering method.
Background technology
Conventional electric generators power transducer measures grade current transformer electric current by acquiring generator terminal voltage and generator terminal, Analog quantity power signal, supply unit Distributed Control System (DCS) and steam turbine digital are generated using time division multiplier principle Electrohydraulic control system (DEH) uses.When breaking down outside unit area, when the punching of adjacent transformers sky, due to fault current It is big or contain the factors such as aperiodic component so that generator generator terminal measures grade current transformer current waveform and is distorted, and causes Power transducer can not actual response generator current power and output error power, even more so that DEH or DCS malfunction. It is fed back according to scene, since power transducer output distortion leads to DEH vapour when a lot of electric network faults have occurred for domestic fired power generating unit The accident of the fast control malfunction of door, also causes the shutdown of more units, consequence is quite serious in some cases.
" CN201410131932 " proposes a kind of generator power delivering method based on over current fault identical criterion, should Method uses full wave Fourier algorithm, and implementation method is simple, but there is also some an open questions：When generator light duty is sent out When raw failure, over current fault identical criterion sensitivity is not high.Since overcurrent definite value generally adjusts the generator for 1.1~1.3 times Rated current, power calculation electric current is just counted using protected level current transformer electric current when fault current need to be more than the definite value It calculates.When breaking down under generator light duty and containing aperiodic component in fault component, since fault current is little, Protected level current transformer electric current is not more than overcurrent definite value threshold, is then cannot achieve at this time by machine potential transformer three-phase voltage The power output being calculated with generator terminal protected level current transformer three-phase current, and grade current transformer is measured because by aperiodic Component factor is influenced and is saturated, and causes current waveform to distort, resulting device output error power.
Invention content
The purpose of the present invention is to provide a kind of based on the generator power pick-up device for integrating harmonic failure identification and change Delivery method can effectively solve the problems, such as that measuring grade CT easily saturations leads to output error power, exports correct power.
To reach above-mentioned purpose, solution of the invention is：
A kind of generator power pick-up device based on comprehensive harmonic failure identification, including：
Detection unit, for detecting generator terminal voltage mutual inductor three-phase voltage, generator terminal measures grade current transformer three Phase current and protected level current transformer three-phase current；
Computing unit, the voltage and current for being obtained according to the detection unit calculate generator terminal voltage mutual inductance The fundamental phasors of device three-phase voltage, generator terminal measure the fundamental phasors and protected level current transformer of grade current transformer three-phase current The fundamental phasors of three-phase current；Power 1 and power 2 are calculated, wherein power 1 is by the fundamental wave of machine potential transformer three-phase voltage The fundamental phasors that phasor and generator terminal measure grade current transformer three-phase current are calculated, and power 2 is by machine potential transformer The fundamental phasors of three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；It calculates by generator terminal Measure nth harmonic component amplitude in grade current transformer three-phase current, wherein n desirable 2,3 or 5；And
Judging unit, for by the harmonic component amplitude compared with harmonic component definite value threshold, when generator terminal measure grade electricity Any phase nth harmonic component amplitude is more than corresponding harmonic component definite value threshold in current transformer three-phase current, then output generator Power 2, otherwise output generator power 1.
A kind of generator power delivering method based on comprehensive harmonic failure identification, includes the following steps：
Step 1：Acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase electricity in real time Stream and generator terminal protected level current transformer three-phase current；
Step 2：The fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithm, generator terminal is surveyed The fundamental phasors of the fundamental phasors and generator terminal protected level current transformer three-phase current of magnitude current transformer three-phase current；
Step 3：Calculate power 1 and power 2；The power 1 is the fundamental wave phase by machine potential transformer three-phase voltage The fundamental phasors that amount and generator terminal measure grade current transformer three-phase current are calculated；The power 2 is mutual by set end voltage The fundamental phasors of sensor three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；
Step 4：Computer terminal measures nth harmonic component amplitude in grade current transformer three-phase current, wherein n desirable 2,3 Or 5；
Step 5：Using harmonic component fault identification criterion, output power 2 when criterion meets, otherwise output power 1.
In above-mentioned steps 3, power 1 is calculated using following formula：
Wherein, P1It is the active power in power 1, Q1It is the reactive power in power 1, Re indicates to take the real part of phasor, Im Expression takes the imaginary part of phasor,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,Respectively generator terminal measures the fundamental phasors of grade current transformer three-phase currentConjugation Plural number.
In above-mentioned steps 3, power 2 is calculated using following formula：
Wherein, P2It is the active power in power 2, Q2It is the reactive power in power 2, Re indicates to take the real part of phasor, Im Expression takes the imaginary part of phasor,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,The respectively fundamental phasors of generator terminal protected level current transformer three-phase currentConjugate complex Number.
Above-mentioned steps 5, it is as follows that harmonic component fault identification sentences formula：
Wherein,Grade current transformer three-phase current nth harmonic component amplitude, I are measured for generator terminaln_SetFor nth harmonic Component definite value threshold.
After adopting the above scheme, the present invention uses harmonic component fault identification criterion, improves generator failure identification and sentences According to sensitivity, it can effectively solve the problems, such as that measuring grade CT easily saturations leads to output error power.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific implementation mode
Technical scheme of the present invention is described in detail below with reference to attached drawing.
The present invention provides a kind of generator power pick-up device based on comprehensive harmonic failure identification, including detection unit, Computing unit and judging unit, wherein detection unit is for detecting generator terminal voltage mutual inductor three-phase voltage, generator terminal measurement Grade current transformer three-phase current and generator terminal protected level current transformer three-phase current.
The voltage and current that the computing unit is used to be obtained according to the detection unit calculates generator terminal voltage The fundamental phasors of mutual inductor three-phase voltage, the fundamental phasors of generator terminal measurement grade current transformer three-phase current and protected level electric current are mutual The fundamental phasors of sensor three-phase current；Power 1 and power 2 are calculated, wherein power 1 is by machine potential transformer three-phase voltage The fundamental phasors that fundamental phasors and generator terminal measure grade current transformer three-phase current are calculated, and power 2 is mutual by set end voltage The fundamental phasors of sensor three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；Calculate by Generator terminal measures nth harmonic component amplitude in grade current transformer three-phase current, wherein n desirable 2,3 or 5.
The judging unit is used for by the harmonic component amplitude compared with harmonic component definite value threshold, when generator terminal measures grade Any phase nth harmonic component amplitude is more than corresponding harmonic component definite value threshold in current transformer three-phase current, then exports power generation Acc power 2, otherwise output generator power 1.
Based on the above pick-up device, as shown in Figure 1, the present invention also provides a kind of power generations based on comprehensive harmonic failure identification Acc power delivering method, includes the following steps：
Step 1, acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase electricity in real time Stream and generator terminal protected level current transformer three-phase current；
Step 2, the fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithmGenerator terminal measures the fundamental phasors of grade current transformer three-phase currentWith generator terminal protected level The fundamental phasors of current transformer three-phase current
Step 3, grade current transformer three-phase is measured according to the fundamental phasors of machine potential transformer three-phase voltage and generator terminal The fundamental phasors of electric current calculate power 1 according to following formula：
Wherein, P1It is the active power in power 1, Q1It is the reactive power in power 1, Re indicates to take the real part of phasor, Im Expression takes the imaginary part of phasor,RespectivelyConjugate complex number.
According to the fundamental phasors of machine potential transformer three-phase voltage and generator terminal protected level current transformer three-phase current Fundamental phasors calculate power 2 according to following formula：
Wherein, P2It is the active power in power 2, Q2It is the reactive power in power 2, Re indicates to take the real part of phasor, Im Expression takes the imaginary part of phasor,RespectivelyConjugate complex number.
Step 4, computer terminal measures nth harmonic component amplitude in grade current transformer three-phase currentWherein n is desirable 2,3 or 5；
Step 5, using harmonic component fault identification criterion, harmonic component fault identification criterion formula is：
Wherein, subscriptDesirable A, B or C, indicate A, B, C three-phase respectively,Grade current transformer three-phase is measured for generator terminal Nth harmonic component amplitude in electric current, wherein n desirable 2,3 or 5；In_SetFor harmonic component definite value threshold.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention Within.

Claims (5)

1. a kind of generator power pick-up device based on comprehensive harmonic failure identification, it is characterised in that including：
Detection unit, for detecting generator terminal voltage mutual inductor three-phase voltage, generator terminal measures grade current transformer three-phase electricity Stream and protected level current transformer three-phase current；
Computing unit, the voltage and current for being obtained according to the detection unit calculate generator terminal voltage mutual inductor three The fundamental phasors of phase voltage, generator terminal measure the fundamental phasors and protected level current transformer three-phase of grade current transformer three-phase current The fundamental phasors of electric current；Power 1 and power 2 are calculated, wherein power 1 is by the fundamental phasors of machine potential transformer three-phase voltage The fundamental phasors that grade current transformer three-phase current is measured with generator terminal are calculated, and power 2 is by machine potential transformer three-phase The fundamental phasors of voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；Calculating is measured by generator terminal Nth harmonic component amplitude in grade current transformer three-phase current, wherein n take 2,3 or 5；And
Judging unit, for by the harmonic component amplitude compared with harmonic component definite value threshold, when generator terminal measure grade electric current it is mutual Any phase nth harmonic component amplitude is more than corresponding harmonic component definite value threshold in sensor three-phase current, then output generator power 2, otherwise output generator power 1.
2. a kind of generator power delivering method based on comprehensive harmonic failure identification, it is characterised in that use following steps：
Step 1：In real time acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase current and Generator terminal protected level current transformer three-phase current；
Step 2：The fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithm, generator terminal measures grade The fundamental phasors of the fundamental phasors and generator terminal protected level current transformer three-phase current of current transformer three-phase current；
Step 3：Calculate power 1 and power 2；The power 1 be by machine potential transformer three-phase voltage fundamental phasors and The fundamental phasors that generator terminal measures grade current transformer three-phase current are calculated；The power 2 is by machine potential transformer The fundamental phasors of three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；
Step 4：Computer terminal measures nth harmonic component amplitude in grade current transformer three-phase current, wherein n desirable 2,3 or 5；
Step 5：Using harmonic component fault identification criterion, output power 2 when criterion meets, otherwise output power 1.
3. the generator power delivering method as claimed in claim 2 based on comprehensive harmonic failure identification, it is characterised in that：Institute It states in step 3, power 1 is calculated using following formula：
Wherein, P1For the active power in power 1, Q1For the reactive power in power 1, Re indicates that the real part of phasor, Im expressions is taken to take phase The imaginary part of amount,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage, Respectively generator generator terminal measures the fundamental phasors of grade current transformer three-phase current,Respectively generator terminal is surveyed The conjugate complex number of magnitude current transformer three-phase current fundamental phasors.
4. the generator power delivering method as claimed in claim 2 based on comprehensive harmonic failure identification, it is characterised in that：Institute It states in step 3, power 2 is calculated using following formula：
Wherein, P2For the active power in power 2, Q2For the reactive power in power 2, Re indicates that the real part of phasor, Im is taken to indicate The imaginary part of phasor is taken,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,The respectively fundamental phasors of generator generator terminal protected level current transformer three-phase current, The respectively conjugate complex number of generator terminal protected level current transformer three-phase current fundamental phasors.
5. the generator power delivering method as claimed in claim 2 based on comprehensive harmonic failure identification, it is characterised in that：Institute It states in step 5, harmonic component fault identification criterion formula is：
Wherein, subscriptDesirable A, B or C, indicate A, B, C three-phase respectively,Grade current transformer three-phase current is measured for generator terminal Middle nth harmonic component amplitude, wherein n take 2,3 or 5；In_SetFor harmonic component definite value threshold.
CN201610729494.6A 2016-08-25 2016-08-25 Generator power pick-up device and delivering method based on comprehensive harmonic failure identification Active CN106253776B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610729494.6A CN106253776B (en) 2016-08-25 2016-08-25 Generator power pick-up device and delivering method based on comprehensive harmonic failure identification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610729494.6A CN106253776B (en) 2016-08-25 2016-08-25 Generator power pick-up device and delivering method based on comprehensive harmonic failure identification

Publications (2)

Publication Number Publication Date
CN106253776A CN106253776A (en) 2016-12-21
CN106253776B true CN106253776B (en) 2018-09-11

Family

ID=57595648

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610729494.6A Active CN106253776B (en) 2016-08-25 2016-08-25 Generator power pick-up device and delivering method based on comprehensive harmonic failure identification

Country Status (1)

Country Link
CN (1) CN106253776B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983096B (en) * 2018-07-27 2021-05-07 国电南瑞南京控制系统有限公司 Method for determining power of high-voltage motor and measuring device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399515A (en) * 2007-09-28 2009-04-01 通用电气公司 System and method for controlling torque ripples in synchronous machines
CN105449724A (en) * 2015-12-18 2016-03-30 南京南瑞继保电气有限公司 Generator power transduction device and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2435529B (en) * 2006-02-23 2008-06-18 Rolls Royce Plc A generator control arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399515A (en) * 2007-09-28 2009-04-01 通用电气公司 System and method for controlling torque ripples in synchronous machines
CN105449724A (en) * 2015-12-18 2016-03-30 南京南瑞继保电气有限公司 Generator power transduction device and method

Also Published As

Publication number Publication date
CN106253776A (en) 2016-12-21

Similar Documents

Publication Publication Date Title
Jia et al. Influence of inverter-interfaced renewable energy generators on directional relay and an improved scheme
Fang et al. Impact of inverter-interfaced renewable energy generators on distance protection and an improved scheme
Gao et al. A high-impedance fault detection method for distribution systems based on empirical wavelet transform and differential faulty energy
Jia et al. Spearman correlation-based pilot protection for transmission line connected to PMSGs and DFIGs
CN105449724B (en) A kind of generator power pick-up device and delivering method
CN105334390B (en) Outside suitable for multimachine assembly concentrates disturbance formula impedance measurement isolated island detection method
Gao et al. Waveform-based method for fast and accurate identification of subsynchronous resonance events
CN105911434B (en) Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference
Dharmapandit et al. Detection, classification, and location of faults on grid‐connected and islanded AC microgrid
CN108957203A (en) A method of detection PT broken neutral line
Baloch et al. Fault protection in microgrid using wavelet multiresolution analysis and data mining
Li et al. Improved amplitude differential protection scheme based on the frequency spectrum index for distribution networks with DFIG-based wind DGs
Xie et al. Adaptive comprehensive auto-reclosing scheme for shunt reactor-compensated transmission lines
Zheng et al. A novel method of insulation parameters measurement based on hybrid flexible arc suppression device in distribution networks
Wang et al. Adaptive reclosing strategy for single outgoing line of converter-interfaced wind park using distance relaying algorithm
Bataglioli et al. Differential protection for stator ground faults in a full-converter wind turbine generator
Mishra A neuro-wavelet approach for the performance improvement in SVC integrated wind-fed transmission line
CN105004959A (en) Wind farm sending-out line inter-phase fault determination method adaptive to stability control device
Chang et al. The impact of DFIG control schemes on the negative-sequence based differential protection
CN106253776B (en) Generator power pick-up device and delivering method based on comprehensive harmonic failure identification
Xie et al. Online parameter determination based adaptive single‐phase reclosing scheme for wind‐powered outgoing lines with shunt reactors
CN106371016B (en) Generator power pick-up device and delivering method based on difference current fault identification
Biswal et al. Kullback‐Leibler divergence based differential protection scheme for shunt compensated transmission line
Wang et al. A novel directional element for transmission line connecting inverter-interfaced renewable energy power plant
Saleh et al. The development of a coordinated anti-islanding protection for collector systems with multiple distributed generation units

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